WO2009006661A1 - Solid fuel comprising a vegetable material and glycerol - Google Patents
Solid fuel comprising a vegetable material and glycerol Download PDFInfo
- Publication number
- WO2009006661A1 WO2009006661A1 PCT/AT2008/000248 AT2008000248W WO2009006661A1 WO 2009006661 A1 WO2009006661 A1 WO 2009006661A1 AT 2008000248 W AT2008000248 W AT 2008000248W WO 2009006661 A1 WO2009006661 A1 WO 2009006661A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solid fuel
- glycerol
- pellets
- pressing
- vegetable material
- Prior art date
Links
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 239000004449 solid propellant Substances 0.000 title claims abstract description 49
- 239000005418 vegetable material Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 17
- 235000011187 glycerol Nutrition 0.000 claims description 57
- 239000008188 pellet Substances 0.000 claims description 51
- 238000003825 pressing Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 20
- 239000010902 straw Substances 0.000 claims description 20
- 241000196324 Embryophyta Species 0.000 claims description 19
- 239000002023 wood Substances 0.000 claims description 18
- 240000002791 Brassica napus Species 0.000 claims description 15
- 235000004977 Brassica sinapistrum Nutrition 0.000 claims description 14
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 11
- 239000008103 glucose Substances 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 10
- 240000008042 Zea mays Species 0.000 claims description 8
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 8
- 235000013312 flour Nutrition 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 7
- 239000003225 biodiesel Substances 0.000 claims description 7
- 235000005822 corn Nutrition 0.000 claims description 7
- 239000006188 syrup Substances 0.000 claims description 7
- 235000020357 syrup Nutrition 0.000 claims description 7
- 229920002261 Corn starch Polymers 0.000 claims description 6
- 239000012188 paraffin wax Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000008120 corn starch Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 235000003222 Helianthus annuus Nutrition 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 241000408747 Lepomis gibbosus Species 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 235000009754 Vitis X bourquina Nutrition 0.000 claims description 4
- 235000012333 Vitis X labruscana Nutrition 0.000 claims description 4
- 240000006365 Vitis vinifera Species 0.000 claims description 4
- 235000014787 Vitis vinifera Nutrition 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- 235000016213 coffee Nutrition 0.000 claims description 4
- 235000013353 coffee beverage Nutrition 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 235000013399 edible fruits Nutrition 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- 150000002334 glycols Chemical class 0.000 claims description 4
- 239000010903 husk Substances 0.000 claims description 4
- 229920000151 polyglycol Polymers 0.000 claims description 4
- 239000010695 polyglycol Substances 0.000 claims description 4
- 229920001592 potato starch Polymers 0.000 claims description 4
- 235000020236 pumpkin seed Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 235000015099 wheat brans Nutrition 0.000 claims description 4
- 235000012054 meals Nutrition 0.000 claims description 3
- 241000208818 Helianthus Species 0.000 claims 2
- 210000000582 semen Anatomy 0.000 claims 2
- 235000006008 Brassica napus var napus Nutrition 0.000 claims 1
- 244000052616 bacterial pathogen Species 0.000 claims 1
- 238000005299 abrasion Methods 0.000 description 14
- 238000007792 addition Methods 0.000 description 14
- 238000005265 energy consumption Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004484 Briquette Substances 0.000 description 2
- 244000020551 Helianthus annuus Species 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 2
- 244000061456 Solanum tuberosum Species 0.000 description 2
- 235000002595 Solanum tuberosum Nutrition 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 235000012907 honey Nutrition 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 235000019198 oils Nutrition 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 235000013311 vegetables Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 235000019759 Maize starch Nutrition 0.000 description 1
- 235000019484 Rapeseed oil Nutrition 0.000 description 1
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 description 1
- 230000008275 binding mechanism Effects 0.000 description 1
- 230000000035 biogenic effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000006049 herbal material Substances 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 235000009973 maize Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/361—Briquettes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/363—Pellets or granulates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Definitions
- the present invention relates to solid fuel of vegetable material and its preparation.
- compressed fuel from vegetable material is usually made of fem ground and dried material in ring or flat die presses under high pressure and slightly elevated temperature.
- An important physical property of such products is the mechanical strength achieved, and in particular the lowest possible abrasion. Crushed fuel with insufficient strength tends to disintegrate to form dust, which causes dust emissions in handling and can interfere with the firing operation. In addition to the strength, care must be taken during pellet production to ensure that the consumption of external energy, operating costs and emissions are as low as possible.
- the mechanical strength in addition to the raw material properties (for example type of wood, duration of the intermediate storage), also depends on process parameters. While the raw material properties can not be changed in a targeted manner, there is some potential in varying the process parameters. Furthermore, the mechanical strength is also influenced by the addition of binders or pressing aids. Wood pellets, for example, are pressed without binders as well as with the addition of up to 2% potato or maize starch. But also possible are vegetable paraffin or molasses. In addition to bonding, it is important to homogenize the wood chips so that the pellet press is constantly processed into a raw material with identical properties, depending on the type of wood, the pretreatment, the moisture and the grain size.
- the present invention relates to a pressed solid fuel comprising at least a vegetable material and glycerol.
- pressed solid fuels comprising at least one vegetable material, which contains, inter alia, cellulose and optionally additionally hemicellulose and / or lignin, have improved properties with addition of glycerol.
- the improved properties are not only the product itself, but also in the production of the same.
- glycerine to plant material prior to compression into a solid fuel has been shown to significantly reduce specific energy consumption during production. Furthermore, the addition of glycerine can increase the mechanical stability of compressed solid fuel (as indicator the abrasion can be used for this purpose).
- Solid fuels with insufficient strength tend to disintegrate to form e.g. Sawdust dust. This causes undesirable dust emissions in the handling of the pellets (e.g., during silo filling or discharge) and often prevents satisfactory plant operation (silo bridging, clogging of forklifts, poor combustion values, etc.). Ensuring minimum pellet abrasion is therefore crucial for both the manufacturer and the end user.
- the abrasion behavior of the solid fuel is used in accordance with standardized measurement methods.
- the abrasion resistance of solid fuels is dependent in particular fol ⁇ constricting factors: a) raw material b) press technology, processes and Anlagenkon ⁇ concept c) the type and duration of storage (absorbing moisture) d) pressing additives (press tools).
- the addition of glycerine to plant material also increases its calorific value / calorific value.
- a compressed solid fuel comprising glycerine generally has a higher calorific value than a solid fuel, which consists exclusively of compressed vegetable material.
- “vegetable material” refers to any material which occurs in agriculture and forestry as a primary substance (eg cereals, wood chips) or as a residue (eg straw, bark, green crop).
- the "vegetable material” according to the present invention comprises cellulose and may further comprise hemicellulose and / or ligms.
- the herbal material which is erfmdungsgehold used, can m prepared in many different ways or used in various ways.
- the vegetable material is comminuted, powdered, ground, etc.
- the vegetable material may further have a water content of up to 30%, preferably up to 20%, more preferably up to 10%.
- the plant material is selected from the group consisting of straw, husks, bran, preferably wheat bran and rye bran, pomace, preferably grape pomace and apple pomace, press cake, preferably from seminal casings, in particular rapeseed, sunflower, pumpkin seeds germ of maize, coffee, fruit skin, wood shavings, paper 'and sawdust.
- the compressed solid fuel according to the invention can be produced with any type of vegetable material, agricultural and forestry primary products or waste products in particular being found to be particularly suitable. These starting materials are present in a sufficient amount and, if processed appropriately, have excellent combustion and compression properties.
- the water content in the vegetable material is preferably up to 30%, wherein the water content can be reduced by drying to about 10% to less than 10%.
- the plant material comes from a presscake or other oily source, it may also have a certain oil content. This Olgehalt is up to 30%, preferably up to 20%, even more preferably up to 10%. Due to the presence of oil, the calorific value of the inventive solid fuel can be further improved.
- the solid fuel may comprise at least one vegetable material, but it is also quite possible to combine two or more plant materials of various origins; while 3, 4, 5, 6, 7, 8, 9, 10 or more plant materials can be combined.
- Preferred combinations of vegetable materials in the solid fuel according to the invention include straw wood, straw rapeseed cake, wood rapeseed cake, straw-wood rapeseed cake, etc.
- the ratio of the individual plant materials may vary.
- the solid fuel glycerin in an amount of 0.1 to 40%, preferably from 1 to 30%, more preferably from 1 to 25%.
- the pressing resistance should be increased in order to obtain compacted compressed solid fuel.
- the pressing resistance can be increased by the selection of suitable matrices whose holes have a greater length.
- the glycerine is derived from the production of biodiesel or fatty acids.
- Glycerine accumulates in large quantities in the production of biodiesel and soap. Since erfmdungsge awkward glycerine of any purity can be used, glycerol, which is obtained directly from the Biodiesel or soap production, be pressed with vegetable material.
- the glycerol used in the invention preferably has a purity of more than 70%, more preferably more than 80%.
- the solid fuel is as Presslmg, pellet, Briquette, flake or chip shaped.
- the pressing can be carried out to presses of various dimensions.
- the shape stability of these compacts is achieved by a suitable choice of the dimensioning in the shaping and by a suitable choice of the pressing pressure and in pellets also by the thickness of the die plate or the Matrizenrings.
- a suitable proportion of vegetable material and glycerol and a suitable pressure of the pressing process dimensionally stable and largely abrasion-resistant pellets or briquettes are produced, provided that the forming pressure of the pressing operation according to an embodiment of the invention in the range of 15 bar to 250 bar, preferably in the range of 25 bar up to 200 bar and more preferably in the range of 30 bar to 180 bar.
- the die thickness should not be significantly less than 15 mm, in order to ensure adequate compression resistance.
- the pellets are preferably produced by means of a pelletizer in a size in the range of 5 mm to 50 mm, and preferably in the range of 10 mm to 30 mm, and depending on the composition of the mixture and larger pellets or briquettes, with a size in the range of 50 mm up to 500 mm, preferably in the range of 100 mm to 300 mm and particularly preferably in the range of 150 mm to 250 mm are possible.
- the crucial point here is that the mixture is adapted in terms of their Adhasionsver- mixture so large to be produced pellets or briquettes that after compression of the mixture sufficient strength of the pellets or briquettes is guaranteed.
- the diameter of the inventive pellets and briquettes is preferably 5 to 20 mm (5 to 15 mm, 5 to 10 mm) or 20 to 150 mm (20 to 120 mm).
- the solid fuel according to the invention can be produced by rolling.
- the solid fuel can be obtained in flake form.
- the erfmdungsgeABAen chips are compacts of various shapes (eg round or square), the area of about 0.5 to 20 cm 2 , preferably from 1 to 10 cm 2 , and a thickness of 0.5 to 20 mm, preferably from 1 up to 5 mm.
- the solid fuel comprises at least one pressing auxiliary.
- binders or pressing aids can be added to the solid fuel before the pressing.
- non-chemically modified products from primary agriculture and forestry such as e.g. Rye flour or corn starch.
- the amount added in the case of known pellets is generally less than 2% by weight, but may be more according to the invention.
- non-chemically modified pressing aids from primary agriculture and forestry there are a large number of non-biogenic pressing aids or chemically modified pressing aids from secondary biomass processing (for example water-soluble cellulose den- sity, lignin).
- the pressing aid is therefore preferably selected from the group consisting of corn meal, starch, especially potato starch or corn starch, rye flour, polyglycols, sugar, glucose syrup, paper flour, cellulose powder and combinations thereof.
- Sugar and glucose syrup may be added, for example, in an amount of from 0.5% to 25%, preferably from 1% to 20%.
- the solid fuel may additionally comprise at least one material selected from the group consisting of graphite, carbon black, glucose, paraffin, and glycols.
- This additional material can serve on the one hand to increase the mechanical stability of the solid fuel produced, on the other hand to increase the calorific value of the solid fuel even more.
- graphite may preferably be added in an amount of 0.5% to 5% or 1% to 2%, paraffin in an amount of 0.5% to 5% or 1% to 3% or 2%.
- Another aspect of the present invention relates to a process for producing a solid fuel from plant material comprising the steps:
- the moisture content of the vegetable material by, for example, drying to an amount of about 1% to 20%, preferably about 10% (eg 7% to 15%) brought. Further, if necessary, the vegetable material may be made to a certain size before mixing. Depending on how the mixture according to the invention is compressed, the vegetable material should be comminuted. For example, in the production of pellets, the vegetable material is in the range of 1 ⁇ m to 10 mm, preferably 1 ⁇ m to 5 mm, and in the production of briquettes in the range of 1 ⁇ m to 5 cm, preferably 1 ⁇ m to 3 cm mince. The comminution of the plant material can be done for example by means of cutter or Koloplexmuhle.
- a Koloplexmuhle has two nested high-speed rotating discs, which are bestuckt with pins of about 1.5 cm in diameter and 2 cm high, which are arranged in mirror image and rotate in a closed housing against each other. This results in large shear forces, which shred the dry or slightly moist millbase.
- the vegetable material Before pressing, the vegetable material is homogeneously mixed with glycerine and optionally with other additives. Mixing can be done by simultaneously adding the individual components m a Teigkneter, roller mill or cutter.
- the cutter is a multi-stage sharp, preferably round, knife, which rotate at high speed.
- the material to be comminuted is comminuted by fine cutting in a large, annularly moving shell under the knives. But it is also possible to give the individual components gradually or sequentially.
- the pressing can erfmdungsgeintroductory by ring or Flachmatrizenpressen or done by rolling.
- the vegetable material is selected from the group consisting of straw, husks, bran, preferably wheat bran and rye bran, pomace, preferably grape pomace and apple pomace, press cake, preferably from seed casings, in particular from rapeseed, sunflower, pumpkin seeds and corn germ, coffee fruit skin, Wood chips, paper and sawdust.
- Glycerol is preferably added to the vegetable material in an amount of from 0.1 to 40%, preferably from 1 to 30%, more preferably from 1 to 25%.
- the glycerol is derived from the production of biodiesel or fatty acids.
- the solid fuel is preferably compressed into pellets, pellets, briquettes, flakes or chips.
- At least one pressing assistant is preferably added to the vegetable material before the pressing.
- the pressing aid is preferably selected from the group consisting of corn grits, starch, particularly potato ⁇ strong or corn starch, rye flour, polyglycols, sugar, glucose syrup, paper powder, cellulose powder, and combinations thereof.
- At least one material selected from the group consisting of graphite, carbon black, glucose, paraffin and glycols is added to the vegetable material.
- the pressing is carried out with ring or flat die presses.
- the compression of the solid fuel can be carried out with any type of press, which is suitable to form Presslmge, pellets and briquettes.
- presses as described in EP 0 371 519, EP 0 489 046, US 4,979,887, DE 21 08 326, DE 27 56 647, FR 2 591 438 and EP 0 956 943 can be used.
- the common types of briquette press are also suitable.
- Another aspect of the present invention relates to the use of glycerol for the production of compressed solid fuel.
- the present invention is further illustrated by, but not limited to, the following example.
- Glycerine has so far mainly been used - in purified form - in the pharmaceutical industry. Also, attempts were made to use in biogas plants. Due to the increased seizure additional recycling rails are to be sought. A possible variant is the mixing with straw or rapeseed cake, a subsequent compression to pellets for thermal utilization in automatically fed firing systems. Straw and rapeseed cake also fall as by-products on the one hand and the production of rapeseed oil on the other hand (for food or as a source of biodiesel production).
- glycerin and honey were based on the anhydrous mass of raw straw and rape cake. This means that e.g. 5 g of glycerol were mixed in mixture A to 95 g of absolutely dry straw (as fresh mass).
- the pressing is done with a bald flat die press Type 14-175.
- the die used has 6 mm holes Diameter and a length of 45 mm. This results in a press ratio of 1: 7.5.
- This matrix is often used in the laboratory for the pelleting of stalks. When pelleting wood, usually a die with a press ratio of 1: 5 is used.
- Table 2 lists the power consumed, the flow rate and the specific energy consumption calculated from it:
- the measurement of the mechanical stability of the pellets is carried out using a abrasion tester (Lignotester) of the brand Borregaard LTII.
- abrasion tester Liignotester
- this abrasion tester about 100 g of pellets are vortexed for 1 minute in an air flow of 70 mbar.
- the resulting Femanteil is screened and weighed out the remaining amount of pellets.
- the abrasion is calculated. For wood pellets according to ONORM M 7135 this may amount to a maximum of 2.3%. This value is also used as a guide in this example to define good quality.
- the investigation of the abrasion is carried out by double determination.
- the mixture of rapeseed cake and glycerine also produced pellets with good stability.
- the best pellets were obtained when trying with 20% glycerine.
- a further improvement of the pellet quality with further increased Glyzermanteil is quite to be expected on the basis of these experiments.
- the pellets with rape cake were softer after compression compared to the straw pellets.
- the addition of glycerol apparently causes the pellets to cure in the cooling phase, so that the good abrasion values shown above are measured.
- the die used is the highest press ratio available in the laboratory (longest bore). From a certain Proportion of glycerin decreases the pressing pressure: in the holes from. This effect can be remedied by using even longer holes.
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Description
FESTBRENNSTOFF UMFASSEND EIN PFLANZLICHES MATERIAL UND GLYZERIN SOLID FUEL COMPLETELY A PLANT MATERIAL AND GLYCERINE
Die vorliegende Erfindung betrifft Festbrennstoff aus pflanzlichem Material und dessen Herstellung.The present invention relates to solid fuel of vegetable material and its preparation.
In der Landwirtschaft und m holzverarbeitenden Betrieben, wie Sage- und Hobelwerken, fallt eine enorme Menge an pflanzlichem Material (z.B. Holzspane, Stroh) an, das sich besonders gut für eine direkte Verwertung in Feuerungen eignen wurde. Da die Nutzung dieses Potentials im Allgemeinen nicht am Ort des Anfalls genutzt werden kann, bietet sich die Produktion von ver- presstem Brennstoff, wie z.B. Pellets, an.In agriculture and in woodworking operations, such as sawmills and planers, an enormous amount of plant material (e.g., wood chips, straw) is produced, which has been particularly well suited for direct use in furnaces. Since the use of this potential can generally not be exploited at the site of the seizure, the production of compressed fuel, e.g. Pellets, on.
Die Herstellung von verpresstem Brennstoff aus pflanzlichem Material erfolgt zumeist aus fem gemahlenem und getrocknetem Material in Ring- oder Flachmatrizenpressen unter hohem Druck und leicht erhöhter Temperatur. Eine wichtige physikalische Eigenschaft bei derartigen Produkten ist die dabei erzielte mechanische Festigkeit und insbesondere ein möglichst geringer Abrieb. Verpresster Brennstoff mit ungenügender Festigkeit neigt zum Zerfallen unter Bildung von Staub, welcher Staubemissionen beim Handling verursacht und den Feuerungsbetrieb stören kann. Nebst der Festigkeit ist bei der Pelletherstellung darauf zu achten, dass der Fremdenergieverbrauch, die Betriebskosten und die Emissionen möglichst gering sind.The production of compressed fuel from vegetable material is usually made of fem ground and dried material in ring or flat die presses under high pressure and slightly elevated temperature. An important physical property of such products is the mechanical strength achieved, and in particular the lowest possible abrasion. Crushed fuel with insufficient strength tends to disintegrate to form dust, which causes dust emissions in handling and can interfere with the firing operation. In addition to the strength, care must be taken during pellet production to ensure that the consumption of external energy, operating costs and emissions are as low as possible.
Die mechanische Festigkeit ist nebst den Rohmateπaleigen- schaften (z.B. Holzart, Dauer der Zwischenlagerung) auch von Prozessparametern abhangig. Wahrend die Rohmaterialeigenschaften meist nicht gezielt verändert werden können, besteht ein gewisses Potenzial durch Variation der Prozessparameter. Weiters wird die mechanische Festigkeit zudem durch den Zusatz von Bindemitteln bzw. Presshilfsmitteln beemflusst. Holzpellets, beispielsweise, werden ohne Bindemittel wie auch unter Zusatz von bis zu 2% Kartoffel- oder Maisstarke verpresst. Möglich sind aber auch pflanzliches Paraffin oder Melasse. Neben der Bindung ist es wichtig, die Holzspane so zu homogenisieren, dass m der Pelletpresse standig ein Rohstoff mit identischen Eigenschaften verarbeitet wird, was von der Holzart, der Vorbehandlung, der Feuchte und der Korngroße abhangt.The mechanical strength, in addition to the raw material properties (for example type of wood, duration of the intermediate storage), also depends on process parameters. While the raw material properties can not be changed in a targeted manner, there is some potential in varying the process parameters. Furthermore, the mechanical strength is also influenced by the addition of binders or pressing aids. Wood pellets, for example, are pressed without binders as well as with the addition of up to 2% potato or maize starch. But also possible are vegetable paraffin or molasses. In addition to bonding, it is important to homogenize the wood chips so that the pellet press is constantly processed into a raw material with identical properties, depending on the type of wood, the pretreatment, the moisture and the grain size.
Es ist Aufgabe der vorliegenden Erfindung Festbrennstoffe, umfassend land- und forstwirtschaftliche Abfalle und Rohstoffe, zur Verfugung zu stellen, die sich insbesondere dadurch aus- zeichnen, dass deren Herstellung im Vergleich zu herkömmlichen Verfahren energiesparender erfolgen kann und dass diese gegen¬ über herkömmlichen verpressten Brennstoffen verbesserte bzw. zumindest gleich bleibende Eigenschaften in Bezug auf Abrieb, Verbrennung und dergleichen aufweisen.It is an object of the present invention to provide solid fuels, including agricultural and forestry wastes and raw materials, which are characterized in particular by drawing, that can be done their production compared to traditional methods of energy-efficient and that they have improved over conventional pressed against ¬ fuels or at least constant properties with regard to abrasion, burn and the like.
Daher betrifft die vorliegende Erfindung einen gepressten Festbrennstoff, umfassend zumindest ein pflanzliches Material und Glyzerin.Therefore, the present invention relates to a pressed solid fuel comprising at least a vegetable material and glycerol.
Es wurde überraschend festgestellt, dass gepresste Fest¬ brennstoffe umfassend zumindest ein pflanzliches Material, welches u.a. Zellulose und gegebenenfalls zusätzlich Hemizellulose und/oder Lignin enthalt, mit Zugabe von Glyzerin verbesserte Eigenschaften aufweisen. Dabei liegen die verbesserten Eigenschaften nicht nur beim Produkt selbst, sondern auch bei der Herstellung desselben.It has surprisingly been found that pressed solid fuels comprising at least one vegetable material, which contains, inter alia, cellulose and optionally additionally hemicellulose and / or lignin, have improved properties with addition of glycerol. The improved properties are not only the product itself, but also in the production of the same.
Durch die Zugabe von Glyzerin zu pflanzlichem Material vor der Verpressung zu einem Festbrennstoff konnte gezeigt werden, dass der spezifische Energieverbrauch bei der Herstellung signifikant reduziert werden kann. Weiters kann durch die Zugabe von Glyzerin die mechanische Stabilität von verpresstem Festbrennstoff erhöht werden (als Indikator kann hierfür der Abrieb herangezogen werden) .The addition of glycerine to plant material prior to compression into a solid fuel has been shown to significantly reduce specific energy consumption during production. Furthermore, the addition of glycerine can increase the mechanical stability of compressed solid fuel (as indicator the abrasion can be used for this purpose).
Festbrennstoffe mit ungenügender Festigkeit neigen zum Zerfallen unter Bildung von z.B. Sagemehlstaub. Dieser verursacht unerwünschte Staubemissionen beim Handling der Pellets (z.B. wahrend der Silobefullung oder der Austragung) und verhindert oftmals einen zufriedenstellenden Anlagenbetrieb (Bruckenbildung im Silo, Verstopfen von Fordereinrichtungen, schlechte Verbrennungswerte usw.) . Die Gewährleistung eines minimalen Pelletabriebs ist daher sowohl für den Hersteller als auch für den Endverbraucher entscheidend.Solid fuels with insufficient strength tend to disintegrate to form e.g. Sawdust dust. This causes undesirable dust emissions in the handling of the pellets (e.g., during silo filling or discharge) and often prevents satisfactory plant operation (silo bridging, clogging of forklifts, poor combustion values, etc.). Ensuring minimum pellet abrasion is therefore crucial for both the manufacturer and the end user.
Als Maß für die mechanische Festigkeit dient das Abriebverhalten des Festbrennstoffs nach normierten Messverfahren. Die Abriebfestigkeit von Festbrennstoffen ist insbesondere von fol¬ genden Faktoren abhangig: a) Rohmaterial b) Press-Technologie, angewandte Verfahren und Anlagenkon¬ zept c) Art und Dauer der Lagerung (Aufnahme von Feuchtigkeit) d) Presszusatzstoffe (Presshilfsmittel) . Die Zugabe von Glyzerin zu pflanzlichem Material erhöht auch dessen Brennwert/Heizwert. Dadurch weist ein verpresster Festbrennstoff umfassend Glyzerin in der Regel einen höheren Brennwert/Heizwert als ein Festbrennstoff auf, der ausschließlich aus verpresstem pflanzlichem Material besteht.As a measure of the mechanical strength, the abrasion behavior of the solid fuel is used in accordance with standardized measurement methods. The abrasion resistance of solid fuels is dependent in particular fol ¬ constricting factors: a) raw material b) press technology, processes and Anlagenkon ¬ concept c) the type and duration of storage (absorbing moisture) d) pressing additives (press tools). The addition of glycerine to plant material also increases its calorific value / calorific value. As a result, a compressed solid fuel comprising glycerine generally has a higher calorific value than a solid fuel, which consists exclusively of compressed vegetable material.
Unter „pflanzlichem Material" wird erfmdungsgemaß jegliches Material bezeichnet, welches in der Land- und Forstwirtschaft als Primarstoff (z.B. Getreide, Holzspane) oder als Reststoff (z.B. Stroh, Rinde, Grunschnitt) anfallt. Das „pflanzliche Material" gemäß der vorliegenden Erfindung umfasst Zellulose und kann ferner Hemizellulose und/oder Ligmn aufweisen. Das pflanzliche Material, welches erfmdungsgemaß zum Einsatz kommt, kann m verschiedenster Weise vorbereitet bzw. in verschiedenster Weise eingesetzt werden. Vorzugsweise ist das pflanzliche Material zerkleinert, pulverformig, gemahlen, etc.. Das pflanzliche Material kann ferner einen Wassergehalt von bis zu 30%, vorzugsweise bis zu 20%, noch mehr bevorzugt bis zu 10%, aufweisen.According to the invention, "vegetable material" refers to any material which occurs in agriculture and forestry as a primary substance (eg cereals, wood chips) or as a residue (eg straw, bark, green crop). The "vegetable material" according to the present invention comprises cellulose and may further comprise hemicellulose and / or ligms. The herbal material, which is erfmdungsgemaß used, can m prepared in many different ways or used in various ways. Preferably, the vegetable material is comminuted, powdered, ground, etc. The vegetable material may further have a water content of up to 30%, preferably up to 20%, more preferably up to 10%.
Gemäß einer bevorzugten Ausfuhrungsform der vorliegenden Erfindung ist das pflanzliche Material ausgewählt aus der Gruppe bestehend aus Stroh, Spelzen, Kleie, vorzugsweise Weizenkleie und Roggenkleie, Trester, vorzugsweise Traubentrester und Apfel- trester, Presskuchen, vorzugsweise aus Samenhüllen, insbesondere aus Raps, Sonnenblumen, Kurbiskernen und Maiskeimen, Kaffeefruchthaut, Holzspanen, Papier 'und Sagemehl.According to a preferred embodiment of the present invention, the plant material is selected from the group consisting of straw, husks, bran, preferably wheat bran and rye bran, pomace, preferably grape pomace and apple pomace, press cake, preferably from seminal casings, in particular rapeseed, sunflower, pumpkin seeds germ of maize, coffee, fruit skin, wood shavings, paper 'and sawdust.
Der erfindungsgemaße verpresste Festbrennstoff lasst sich mit jeglicher Art von pflanzlichem Material herstellen, wobei sich insbesondere land- und forstwirtschaftliche Primarprodukte bzw. Abfallprodukte als besonders geeignet erwiesen. Diese Ausgangsstoffe sind m ausreichender Menge vorhanden und weisen bei entsprechender Verarbeitung hervorragende Verbrennungs- und Ver- pressungsseigenschaften auf. Der Wassergehalt im pflanzlichen Material betragt vorzugsweise bis zu 30%, wobei der Wassergehalt durch Trocknung durchaus auf ca. 10% bis unter 10% reduziert werden kann. Stammt das pflanzliche Material z.B. von einem Presskuchen oder einer sonstigen ölhaltigen Quelle, kann dieses auch noch einen bestimmten Olgehalt aufweisen. Dieser Olgehalt betragt bis zu 30%, vorzugsweise bis zu 20%, noch mehr bevorzugt bis zu 10%. Durch das Vorhandensein von Ol kann der Brennwert des erfmdungsgemaßen Festbrennstoffes noch weiter verbessert werden . Erfxndungsgemaß kann der Festbrennstoff zumindest ein pflanzliches Material umfassen, wobei es aber auch durchaus möglich ist, zwei oder mehrere pflanzliche Materialien verschiedenster Herkunft zu kombinieren; dabei können 3, 4, 5, 6, 7, 8, 9, 10 oder mehr pflanzliche Materialien miteinander kombiniert werden. Bevorzugte Kombinationen an pflanzlichen Materialien im erfindungsgemaßen Festbrennstoff umfassen Stroh-Holz, Stroh- Rapspresskuchen, Holz-Rapspresskuchen, Stroh-Holz-Rapspresskuchen, usw.. Das Verhältnis der einzelnen pflanzlichen Materialien kann dabei variieren.The compressed solid fuel according to the invention can be produced with any type of vegetable material, agricultural and forestry primary products or waste products in particular being found to be particularly suitable. These starting materials are present in a sufficient amount and, if processed appropriately, have excellent combustion and compression properties. The water content in the vegetable material is preferably up to 30%, wherein the water content can be reduced by drying to about 10% to less than 10%. For example, if the plant material comes from a presscake or other oily source, it may also have a certain oil content. This Olgehalt is up to 30%, preferably up to 20%, even more preferably up to 10%. Due to the presence of oil, the calorific value of the inventive solid fuel can be further improved. Erfxndungsgemaß the solid fuel may comprise at least one vegetable material, but it is also quite possible to combine two or more plant materials of various origins; while 3, 4, 5, 6, 7, 8, 9, 10 or more plant materials can be combined. Preferred combinations of vegetable materials in the solid fuel according to the invention include straw wood, straw rapeseed cake, wood rapeseed cake, straw-wood rapeseed cake, etc. The ratio of the individual plant materials may vary.
Erfmdungsgemaß hat es sich als besonders vorteilhaft erwiesen, wenn der Festbrennstoff Glyzerin in einer Menge von 0,1 bis 40%, vorzugsweise von 1 bis 30%, noch mehr bevorzugt von 1 bis 25%, aufweist.Erfmdungsgemaß it has proved to be particularly advantageous if the solid fuel glycerin in an amount of 0.1 to 40%, preferably from 1 to 30%, more preferably from 1 to 25%.
Bereits die Zugabe von wenigen Teilen Glyzerin zum pflanzlichen Material fuhrt dazu, dass der Energieaufwand bei der Ver- pressung im Vergleich zu herkömmlichen Verfahren reduziert werden kann. Die optimale Menge an Glyzerin im Festbrennstoff hangt auch vom pflanzlichen Material ab. Mit einigen wenigen Verpressungsversuchen lasst sich aber das ideale Verhältnis von Glyzerin zu pflanzlichem Material bestimmen.Already the addition of a few parts of glycerine to the plant material leads to the fact that the energy expenditure with the pressing can be reduced compared to conventional methods. The optimal amount of glycerine in the solid fuel also depends on the plant material. With a few compression attempts, however, the ideal ratio of glycerine to plant material can be determined.
Zu beachten ist bei der Herstellung von verpresstem Festbrennstoff aus pflanzlichem Material und Glyzerin auch, dass bei einer höheren Menge an Glyzerin der Presswiderstand erhöht werden sollte um kompakt verpressten Festbrennstoff zu erhalten. Bei der Herstellung von Pellets, beispielsweise, kann der Presswiderstand durch die Auswahl geeigneter Matrizen, deren Bohrungen eine größere Lange aufweisen, erhöht werden.In the production of compressed solid fuel from vegetable material and glycerine, it should also be noted that with a higher amount of glycerine, the pressing resistance should be increased in order to obtain compacted compressed solid fuel. In the production of pellets, for example, the pressing resistance can be increased by the selection of suitable matrices whose holes have a greater length.
Gemäß einer bevorzugten Ausfuhrungsform der vorliegenden Erfindung stammt das Glyzerin aus der Herstellung von Biodiesel oder Fettsauren.According to a preferred embodiment of the present invention, the glycerine is derived from the production of biodiesel or fatty acids.
Glyzerin fallt in großen Mengen bei der Herstellung von Biodiesel und Seife an. Da erfmdungsgemaß Glyzerin jeglicher Reinheit verwendet werden kann, kann Glyzerin, welches direkt aus der Biodiesel- bzw. Seifenproduktion anfallt, mit pflanzlichem Material verpresst werden. Das erfmdungsgemaß eingesetzte Glyzerin weist vorzugsweise eine Reinheit von mehr als 70%, noch mehr bevorzugt von mehr als 80%, auf.Glycerine accumulates in large quantities in the production of biodiesel and soap. Since erfmdungsgemaß glycerine of any purity can be used, glycerol, which is obtained directly from the Biodiesel or soap production, be pressed with vegetable material. The glycerol used in the invention preferably has a purity of more than 70%, more preferably more than 80%.
Gemäß einer weiteren bevorzugten Ausfuhrungsform der vorliegenden Erfindung ist der Festbrennstoff als Presslmg, Pellet, Brikett, Flocke oder Chip geformt.According to a further preferred embodiment of the present invention, the solid fuel is as Presslmg, pellet, Briquette, flake or chip shaped.
Die Verpressung kann zu Presslmgen verschiedener Dimensionen erfolgen. Die Formstabilitat dieser Presslinge wird durch eine geeignete Wahl der Dimensionierung bei der Formgebung und durch eine geeignete Wahl des Pressdruckes und bei Pellets zudem durch die Dicke der Matrizenscheibe bzw. des Matrizenrings erreicht. Bei einem geeigneten Anteil an pflanzlichem Material und Glyzerin und einem geeigneten Druck des Pressvorgangs werden formstabile und weitgehend abriebfeste Pellets oder Briketts erzeugt, sofern der formgebende Druck des Pressvorgangs gemäß einer Weiterbildung der Erfindung im Bereich von 15 bar bis 250 bar, vorzugsweise im Bereich von 25 bar bis 200 bar und besonders bevorzugt im Bereich von 30 bar bis 180 bar liegt. Dabei gilt, dass ausreichend formstabile und abriebfeste Presslinge erzeugt werden können, wenn bei der Produktion von bezüglich der Dimensionen größerer Presslinge der Druck entsprechend linear ansteigt. Bei der Pellet-Formgebung soll die Matrizendicke 15 mm nicht wesentlich unterschreiten, um somit einen ausreichenden Presswiderstand zu gewahren.The pressing can be carried out to presses of various dimensions. The shape stability of these compacts is achieved by a suitable choice of the dimensioning in the shaping and by a suitable choice of the pressing pressure and in pellets also by the thickness of the die plate or the Matrizenrings. With a suitable proportion of vegetable material and glycerol and a suitable pressure of the pressing process dimensionally stable and largely abrasion-resistant pellets or briquettes are produced, provided that the forming pressure of the pressing operation according to an embodiment of the invention in the range of 15 bar to 250 bar, preferably in the range of 25 bar up to 200 bar and more preferably in the range of 30 bar to 180 bar. It is true that sufficiently dimensionally stable and abrasion-resistant compacts can be produced if the pressure increases correspondingly linearly in the production of larger dimensions of the compacts. In pellet shaping, the die thickness should not be significantly less than 15 mm, in order to ensure adequate compression resistance.
Die Pellets werden bevorzugt mittels eines Pelletierers in einer Große im Bereich von 5 mm bis 50 mm und bevorzugt im Bereich von 10 mm bis 30 mm hergestellt, wobei je nach Zusammensetzung der Mischung auch größere Pellets oder Briketts, mit einer Große im Bereich von 50 mm bis 500 mm, bevorzugt im Bereich von 100 mm bis 300 mm und besonders bevorzugt im Bereich von 150 mm bis 250 mm möglich sind. Der entscheidende Punkt hierbei ist, dass die Mischung hinsichtlich ihres Adhasionsver- mogens derart an die Große der herzustellenden Pellets bzw. Briketts angepasst wird, dass nach dem Verpressen der Mischung eine ausreichende Festigkeit der Pellets bzw. Briketts gewährleistet ist. Der Durchmesser der erfmdungsgemaßen Pellets und Briketts betragt vorzugsweise 5 bis 20 mm (5 bis 15 mm, 5 bis 10 mm) bzw. 20 bis 150 mm (20 bis 120 mm) .The pellets are preferably produced by means of a pelletizer in a size in the range of 5 mm to 50 mm, and preferably in the range of 10 mm to 30 mm, and depending on the composition of the mixture and larger pellets or briquettes, with a size in the range of 50 mm up to 500 mm, preferably in the range of 100 mm to 300 mm and particularly preferably in the range of 150 mm to 250 mm are possible. The crucial point here is that the mixture is adapted in terms of their Adhasionsver- mixture so large to be produced pellets or briquettes that after compression of the mixture sufficient strength of the pellets or briquettes is guaranteed. The diameter of the inventive pellets and briquettes is preferably 5 to 20 mm (5 to 15 mm, 5 to 10 mm) or 20 to 150 mm (20 to 120 mm).
Anstelle von Pellets und Briketts kann der erfmdungsgemaße Festbrennstoff durch Walzen hergestellt werden. Dabei kann der Festbrennstoff in Flockenform gewonnen werden.Instead of pellets and briquettes, the solid fuel according to the invention can be produced by rolling. In this case, the solid fuel can be obtained in flake form.
Die erfmdungsgemaßen Chips sind Presslinge unterschiedlichster Form (z.B. rund oder eckig), die eine Flache von ca. 0,5 bis 20 cm2, vorzugsweise von 1 bis 10 cm2, und eine Dicke von 0,5 bis 20 mm, vorzugsweise von 1 bis 5 mm, aufweisen. Gemäß einer bevorzugten Ausfuhrungsform der vorliegenden Erfindung umfasst der Festbrennstoff zumindest ein Presshilfsmit- tel.The erfmdungsgemaßen chips are compacts of various shapes (eg round or square), the area of about 0.5 to 20 cm 2 , preferably from 1 to 10 cm 2 , and a thickness of 0.5 to 20 mm, preferably from 1 up to 5 mm. According to a preferred embodiment of the present invention, the solid fuel comprises at least one pressing auxiliary.
Erfmdungsgemaß können dem Festbrennstoff vor dem Verpressen Bindemittel bzw. Presshilfsmittel zugesetzt werden. Als Presshilfsmittel gelten insbesondere chemisch nicht veränderte Produkte aus der primären Land- und Forstwirtschaft, wie z.B. Roggenmehl oder Maisstarke. Die zugesetzte Menge bei bekannten Pellets betragt m der Regel weniger als 2 Gew.-%, kann aber er- fmdungsgemaß mehr betragen. Neben chemisch nicht veränderten Presshilfsmitteln aus der primären Land- und Forstwirtschaft gibt es eine große Zahl von nicht biogenen Presshilfsmitteln bzw. von chemisch veränderten Presshilfsmitteln aus der sekundären Biomasseverarbeitung (z.B. wasserlösliche Cellulosedenva- te, Lignin) .According to the invention, binders or pressing aids can be added to the solid fuel before the pressing. In particular, non-chemically modified products from primary agriculture and forestry, such as e.g. Rye flour or corn starch. The amount added in the case of known pellets is generally less than 2% by weight, but may be more according to the invention. In addition to non-chemically modified pressing aids from primary agriculture and forestry, there are a large number of non-biogenic pressing aids or chemically modified pressing aids from secondary biomass processing (for example water-soluble cellulose den- sity, lignin).
Das Presshilfsmittel ist daher vorzugsweise ausgewählt aus der Gruppe bestehend aus Maisschrot, Starke, insbesondere Kartoffelstarke oder Maisstarke, Roggenmehl, Polyglykole, Zucker, Glukosesirup, Papiermehl, Zellulosepulver und Kombinationen davon. Zucker und Glukosesirup können beispielsweise m einer Menge von 0,5% bis 25%, vorzugsweise von 1% bis 20%, zugesetzt werden .The pressing aid is therefore preferably selected from the group consisting of corn meal, starch, especially potato starch or corn starch, rye flour, polyglycols, sugar, glucose syrup, paper flour, cellulose powder and combinations thereof. Sugar and glucose syrup may be added, for example, in an amount of from 0.5% to 25%, preferably from 1% to 20%.
Zusätzlich zu pflanzlichem Material, Glyzerin und gegebenenfalls Presshilfsmittel, kann der Festbrennstoff zusätzlich zumindest ein Material ausgewählt aus der Gruppe bestehend aus Graphit, Ruß, Glukose, Paraffin und Glykole umfassen.In addition to vegetable matter, glycerin, and optionally pressing aids, the solid fuel may additionally comprise at least one material selected from the group consisting of graphite, carbon black, glucose, paraffin, and glycols.
Dieses zusätzliche Material kann einerseits dazu dienen die mechanische Stabilität des hergestellten Festbrennstoffs, andererseits um den Brennwert des Festbrennstoffs noch mehr zu erhohen. Vorzugsweise kann beispielsweise Graphit in einer Menge von 0,5% bis 5% oder 1% bis 2%, Paraffin in einer Menge von 0,5% bis 5% oder 1% bis 3% oder 2% zugesetzt werden.This additional material can serve on the one hand to increase the mechanical stability of the solid fuel produced, on the other hand to increase the calorific value of the solid fuel even more. For example, graphite may preferably be added in an amount of 0.5% to 5% or 1% to 2%, paraffin in an amount of 0.5% to 5% or 1% to 3% or 2%.
Ein weiterer Aspekt der vorliegenden Erfindung betrifft ein Verfahren zur Herstellung eines Festbrennstoffs aus pflanzlichem Material umfassend die Schritte:Another aspect of the present invention relates to a process for producing a solid fuel from plant material comprising the steps:
- Mischen des pflanzlichen Materials mit Glyzerin und- mixing the vegetable material with glycerin and
- Verpressen der Mischung zu Presslmgen, Pellets, Briketts, Flocken oder Chips.- Pressing the mixture into extrudates, pellets, briquettes, flakes or chips.
Vor dem Vermischen der einzelnen Komponenten wird der Feuchtigkeitsgehalt des pflanzlichen Materials durch z.B. Trocknung auf eine Menge von ca. 1% bis 20%, vorzugsweise auf ca. 10% (z.B. auch 7% bis 15%) gebracht. Ferner kann das pflanzliche Material, sofern erforderlich, vor dem Vermischen auf eine bestimmte Große gebracht werden. Je nachdem, wie die erfindungsgemaße Mischung verpresst wird, sollte das pflanzliche Material zerkleinert werden. Beispielsweise ist das pflanzliche Material bei der Herstellung von Pellets im Bereich von 1 μm bis 10 mm, vorzugsweise von 1 μm bis 5 mm, und bei der Herstellung von Briketts im Bereich von 1 μm bis 5 cm, vorzugsweise 1 μm bis 3 cm, zu zerkleinern. Die Zerkleinerung des pflanzlichen Materials kann beispielsweise mittels Cutter oder Koloplexmuhle erfolgen. Eine Koloplexmuhle weist zwei ineinander verschachtelte hochtourig rotierende Scheiben auf, die bestuckt sind mit Zapfen von ca. 1,5 cm Durchmesser und 2 cm Hohe, welche spiegelbildlich angeordnet sind und im geschlossenen Gehäuse gegeneinander rotieren. Es entstehen große Scherkräfte, welche das trockene bzw. leicht feuchte Mahlgut zerkleinern.Before mixing the individual components, the moisture content of the vegetable material by, for example, drying to an amount of about 1% to 20%, preferably about 10% (eg 7% to 15%) brought. Further, if necessary, the vegetable material may be made to a certain size before mixing. Depending on how the mixture according to the invention is compressed, the vegetable material should be comminuted. For example, in the production of pellets, the vegetable material is in the range of 1 μm to 10 mm, preferably 1 μm to 5 mm, and in the production of briquettes in the range of 1 μm to 5 cm, preferably 1 μm to 3 cm mince. The comminution of the plant material can be done for example by means of cutter or Koloplexmuhle. A Koloplexmuhle has two nested high-speed rotating discs, which are bestuckt with pins of about 1.5 cm in diameter and 2 cm high, which are arranged in mirror image and rotate in a closed housing against each other. This results in large shear forces, which shred the dry or slightly moist millbase.
Vor dem Verpressen wird das pflanzliche Material mit Glyzerin und gegebenenfalls mit weiteren Zusatzstoffen homogen vermischt. Das Vermischen kann durch das gleichzeitige Zugeben der einzelnen Komponenten m einen Teigkneter, Walzenstuhl oder Cutter erfolgen. Beim Cutter handelt es sich um mehrstufige scharfe, vorzugsweise runde, Messer, die mit hoher Drehzahl rotieren. Das Zerkleinerungsgut wird in einer großen, ringförmig bewegten Schale unter den Messern durch Feinschneiden zerkleinert. Es ist aber auch möglich, die einzelnen Komponenten stufenweise bzw. sequentiell dazu zu geben.Before pressing, the vegetable material is homogeneously mixed with glycerine and optionally with other additives. Mixing can be done by simultaneously adding the individual components m a Teigkneter, roller mill or cutter. The cutter is a multi-stage sharp, preferably round, knife, which rotate at high speed. The material to be comminuted is comminuted by fine cutting in a large, annularly moving shell under the knives. But it is also possible to give the individual components gradually or sequentially.
Das Verpressen kann erfmdungsgemaß durch Ring- oder Flachmatrizenpressen oder aber durch Walzen erfolgen.The pressing can erfmdungsgemaß by ring or Flachmatrizenpressen or done by rolling.
Gemäß einer bevorzugten Ausfuhrungsform ist das pflanzliche Material ausgewählt aus der Gruppe bestehend aus Stroh, Spelzen, Kleie, vorzugsweise Weizenkleie und Roggenkleie, Trester, vorzugsweise Traubentrester und Apfeltrester, Presskuchen, vorzugsweise aus Samenhüllen, insbesondere aus Raps, Sonnenblumen, Kurbiskernen und Maiskeimen, Kaffeefruchthaut, Holzspane, Papier und Sagemehl .According to a preferred embodiment, the vegetable material is selected from the group consisting of straw, husks, bran, preferably wheat bran and rye bran, pomace, preferably grape pomace and apple pomace, press cake, preferably from seed casings, in particular from rapeseed, sunflower, pumpkin seeds and corn germ, coffee fruit skin, Wood chips, paper and sawdust.
Dem pflanzlichen Material wird Glyzerin vorzugsweise in einer Menge von 0,1 bis 40%, vorzugsweise von 1 bis 30%, noch mehr bevorzugt von 1 bis 25%, zugesetzt.Glycerol is preferably added to the vegetable material in an amount of from 0.1 to 40%, preferably from 1 to 30%, more preferably from 1 to 25%.
Gemäß einer bevorzugten Ausfuhrungsform stammt das Glyzerin aus der Herstellung von Biodiesel oder Fettsauren.According to a preferred embodiment, the glycerol is derived from the production of biodiesel or fatty acids.
Der Festbrennstoff wird vorzugsweise zu Presslingen, Pellets, Briketts, Flocken oder Chips verpresst.The solid fuel is preferably compressed into pellets, pellets, briquettes, flakes or chips.
Dem pflanzlichen Material wird vorzugsweise vor dem Verpres- sen zumindest ein Presshilfsmittel zugesetzt.At least one pressing assistant is preferably added to the vegetable material before the pressing.
Das Presshilfsmittel ist vorzugsweise ausgewählt aus der Gruppe bestehend aus Maisschrot, Starke, insbesondere Kartoffel¬ starke oder Maisstarke, Roggenmehl, Polyglykole, Zucker, Glukosesirup, Papiermehl, Zellulosepulver und Kombinationen davon.The pressing aid is preferably selected from the group consisting of corn grits, starch, particularly potato ¬ strong or corn starch, rye flour, polyglycols, sugar, glucose syrup, paper powder, cellulose powder, and combinations thereof.
Gemäß einer weiteren bevorzugten Ausfuhrungsform wird dem pflanzlichen Material weiters zumindest ein Material ausgewählt aus der Gruppe bestehend aus Graphit, Ruß, Glukose, Paraffin und Glykole zugesetzt.According to a further preferred embodiment, at least one material selected from the group consisting of graphite, carbon black, glucose, paraffin and glycols is added to the vegetable material.
Gemäß einer bevorzugten Ausfuhrungsform der vorliegenden Erfindung wird das Verpressen mit Ring- oder Flachmatrizenpressen durchgeführt .According to a preferred embodiment of the present invention, the pressing is carried out with ring or flat die presses.
Erfmdungsgemaß kann das Verpressen des Festbrennstoffs mit jeglicher Art von Presse durchgeführt werden, die geeignet ist Presslmge, Pellets und Briketts zu formen. Insbesondere können Pressen wie in der EP 0 371 519, EP 0 489 046, US 4,979,887, DE 21 08 326, DE 27 56 647, FR 2 591 438 und EP 0 956 943 beschrieben verwendet werden. Zusätzlich dazu eignen sich auch die gangigen Arten von Brikettpressen.Erfmdungsgemaß the compression of the solid fuel can be carried out with any type of press, which is suitable to form Presslmge, pellets and briquettes. In particular, presses as described in EP 0 371 519, EP 0 489 046, US 4,979,887, DE 21 08 326, DE 27 56 647, FR 2 591 438 and EP 0 956 943 can be used. In addition, the common types of briquette press are also suitable.
Ein weiterer Aspekt der vorliegenden Erfindung betrifft die Verwendung von Glyzerin zur Herstellung von verpresstem Festbrennstoff.Another aspect of the present invention relates to the use of glycerol for the production of compressed solid fuel.
Die vorliegende Erfindung wird ferner durch das nachfolgende Beispiel naher erläutert, ohne jedoch auf dieses beschrankt zu sein .The present invention is further illustrated by, but not limited to, the following example.
B e i s p i e l:B e i s p i e l:
Glyzerin wurde bislang vor allem - in gereinigter Form - in der Pharmaindustrie eingesetzt. Auch wurden Versuche bezüglich eines Einsatzes in Biogasanlagen angestellt. Durch den gesteigerten Anfall sind zusätzliche Verwertungsschienen zu suchen. Als mögliche Variante bietet sich die Vermischung mit Stroh oder Rapskuchen, einer anschließenden Verpressung zu Pellets für eine thermische Verwertung in automatisch beschickten Feuerungsanlagen an. Stroh und Rapskuchen fallen ebenfalls als Nebenprodukte der Getreideproduktion einerseits und der Herstellung von Rapsöl andererseits (für Speisezwecke oder als Ausgangsprodukt der Biodieselherstellung) an.Glycerine has so far mainly been used - in purified form - in the pharmaceutical industry. Also, attempts were made to use in biogas plants. Due to the increased seizure additional recycling rails are to be sought. A possible variant is the mixing with straw or rapeseed cake, a subsequent compression to pellets for thermal utilization in automatically fed firing systems. Straw and rapeseed cake also fall as by-products on the one hand and the production of rapeseed oil on the other hand (for food or as a source of biodiesel production).
In diesem Beispiel soll die Auswirkung der Beimischung von Glyzerin auf den Pelletierprozess selbst (Energieaufwand) und auf die Qualltat der hergestellten Pellets (mechanische Stabilität) untersucht werden. Daraus wird abgeleitet, welche Menge an Glyzerin zu Stroh oder Rapskuchen beigemengt werden kann, um gute Pelletsqualltat zu erzielen.In this example, the effect of blending glycerine on the pelleting process itself (energy expenditure) and on the quality of the produced pellets (mechanical stability) should be investigated. From this it is deduced which amount of glycerin can be added to straw or rapeseed cake in order to achieve good pelletsquallity.
Eingesetzte MischungenUsed mixtures
Für die Beurteilung der Pelletierbarkeit von Stroh und Rapskuchen in Mischung mit Glyzerin werden verschieden hohe Anteile an Glyzerin zu den Rohstoffen beigemengt. Auf Anregung des Auftraggebers wurde bei zwei Mischungen auch Honig als Substitut für Glukosesirup zugemischt. Folgende Mischungsverhaltnisse wurden hergestellt:For the evaluation of the pelletability of straw and rapeseed cake mixed with glycerine different amounts of glycerol are added to the raw materials. At the suggestion of the client, honey was added to two mixtures as a substitute for glucose syrup. The following mixing ratios were prepared:
Tabelle 1 Zusammensetzung der MischungenTable 1 Composition of the mixtures
Die Berechnung der Glyzerin- und Honigbeigabe erfolgte auf Basis der wasserfreien Masse der Rohstoffe Stroh und Rapskuchen. Das bedeutet, dass z.B. bei Mischung A zu je 95 g absolut trockenem Stroh 5 g Glyzerin gemischt wurden (als Frischmasse ) .The calculation of glycerin and honey was based on the anhydrous mass of raw straw and rape cake. This means that e.g. 5 g of glycerol were mixed in mixture A to 95 g of absolutely dry straw (as fresh mass).
Die Verpressung erfolgt mit einer Kahl-Flachmatrizenpresse Type 14-175. Die verwendete Matrize hat Bohrungen mit 6 mm Durchmesser und einer Lange von 45 mm. Daraus errechnet sich ein Pressverhaltnis von 1:7,5. Diese Matrize wird im Labor häufig eingesetzt für die Pelletierung von Halmgutern. Bei der Pelletierung von Holz wird üblicherweise eine Matrize mit einem Pressverhaltnis von 1:5 eingesetzt.The pressing is done with a bald flat die press Type 14-175. The die used has 6 mm holes Diameter and a length of 45 mm. This results in a press ratio of 1: 7.5. This matrix is often used in the laboratory for the pelleting of stalks. When pelleting wood, usually a die with a press ratio of 1: 5 is used.
Ermittlung des Energieverbrauchs bei der Pelletierung Für die Ermittlung des Energieverbrauches bei der Pelletierung kann an der Pelletierpresse die momentan aufgenommene Leistung abgelesen werden. Diese wird im Minutentakt dokumentiert und gleichzeitig wahrend eines Versuches mindestens zweimal der Durchsatz gemessen. Daraus errechnet sich der spezifische Energieverbrauch je Kilogramm Pellets. Der Energieverbrauch wurde nur bei den Versuchen A, B, C, E und F durchgeführt. Bei den anderen Versuchen war aufgrund der Klebrigkeit keine gleichmäßige Zuforderung des Aufgabematerials in den Pressraum gewährleistet .Determination of energy consumption during pelleting In order to determine the energy consumption during pelleting, the currently recorded power can be read off the pelleting press. This is documented every minute and at the same time during a test at least twice the throughput measured. From this, the specific energy consumption per kilogram of pellets is calculated. The energy consumption was only carried out in experiments A, B, C, E and F. In the other tests, due to the stickiness, no uniform feeding of the feed material into the press room was ensured.
In Tabelle 2 sind die aufgenommene Leistung, die Durchsatzmenge und der daraus errechnete spezifische Energieverbrauch angeführt:Table 2 lists the power consumed, the flow rate and the specific energy consumption calculated from it:
Tabelle 2: Energieverbrauch bei der PelletierungTable 2: Energy consumption during pelleting
Ersichtlich ist, dass bei den Mischungen mit Stroh bei steigendem Anteil an Glyzerin der Energieverbrauch für die Pelletierung absinkt Daraus kann auf eine schmierende Wirkung von Glyzerin in den Matrizenbohrungen und einen damit verbundenen geringeren Presswiderstand geschlossen werden. Üblicherweise sinkt mit dem Presswiderstand auch die Harte und mechanische Stabilität der Pellets. Da durch die Zugabe von Glyzerin offensichtlich noch andere Bindemechanismen wirksam werden, als bei Holz und Halmgutern bekannt sind, kann bei Verwendung von Glyzerin mit geringen Pressdrucken und damit verbunden geringem Energieverbrauch eine gute Pelletsqualltat erzielt werden.It can be seen that in the mixtures with straw as the proportion of glycerol increases the energy consumption for pelleting decreases. This can be concluded that a lubricating effect of glycerol in the die holes and a corresponding lower compression resistance. Usually With the pressing resistance, the hardness and mechanical stability of the pellets are also reduced. Since the addition of glycerine obviously other binding mechanisms are effective, as are known in wood and stalks, when using glycerol with low pressing pressures and thus low energy consumption, a good Pelletsqualltat can be achieved.
Bei der Pelletierung von Rapskuchen wurde zur Abschätzung des Verhaltens bei der Pelletierung vorab ein Versuch mit reinem Presskuchen durchgeführt. Aufgrund des Restolgehaltes ist die Schmierung in den Matrizenbohrungen so stark, dass der Presskuchen lose durchfallt, wodurch keine geeigneten Rapskuchenpellets erzeugt werden konnten. Nach der Beigabe von Glyzerin wies das Aufgabematerial eine gewisse Klebrigkeit auf, so dass sich die Bohrungen füllten und Pellets produziert werden konnten.For the pelleting of rape cake, a test with pure press cake was carried out in advance to estimate the behavior during pelleting. Due to the residual content, the lubrication in the die bores is so strong that the press cake falls loose, which means that no suitable rapeseed pellets could be produced. After the addition of glycerine, the feed had some stickiness, so that the wells filled and pellets could be produced.
Eine höhere Beigabe von Glyzerin, wie in Tabelle 2 ersichtlich, bewirkt wiederum einen verminderten Energieverbrauch bei der Pelletierung. Dieser liegt bei den Rapskuchenmischungen generell deutlich unter den Werten von Strohmischungen.A higher addition of glycerin, as shown in Table 2, in turn, causes a reduced energy consumption in pelleting. For rapeseed cake mixtures, this is generally well below the values of straw mixtures.
Messung der mechanischen Stabilität der PelletsMeasurement of the mechanical stability of the pellets
Die Messung der mechanischen Stabilität der Pellets erfolgt mit einem Abriebtester (Lignotester) der Marke Borregaard LTII. In diesem Abriebtester werden etwa 100 g Pellets 1 Minute in einem Luftstrom von 70 mbar gewirbelt. Anschließend wird der dabei entstandene Femanteil abgesiebt und die verbleibende Pelletsmenge ruckgewogen. Aus der Differenz der Masse der eingewogenen und der ruckgewogenen Pellets wird der Abrieb errechnet. Bei Holzpellets gemäß ONORM M 7135 darf dieser maximal 2,3% betragen. Dieser Wert dient auch bei diesem Beispiel als Richtwert, um gute Qualität zu definieren. Die Untersuchung des Abriebs erfolgt durch Doppelbestimmung.The measurement of the mechanical stability of the pellets is carried out using a abrasion tester (Lignotester) of the brand Borregaard LTII. In this abrasion tester, about 100 g of pellets are vortexed for 1 minute in an air flow of 70 mbar. Subsequently, the resulting Femanteil is screened and weighed out the remaining amount of pellets. From the difference of the mass of the weighed and the back-weighed pellets, the abrasion is calculated. For wood pellets according to ONORM M 7135 this may amount to a maximum of 2.3%. This value is also used as a guide in this example to define good quality. The investigation of the abrasion is carried out by double determination.
In Tabelle 3 ist die mechanische Stabilität der hergestellten Pellets zusammenfassend angeführt:Table 3 summarizes the mechanical stability of the pellets produced:
80_S/20_G D 1, 10 1, 40 1,25 80_S / 20_G D 1, 10 1, 40 1.25
90 R/10_G F 1, 80 1, 90 1,8590 R / 10_G F 1, 80 1, 90 1.85
80 R/20_G G 1,50 1,80 1,6580 R / 20_G G 1.50 1.80 1.65
85 S/10_G/5 H H 1,20 1,70 1, 4585 S / 10_G / 5 H H 1.20 1.70 1.45
85 R/10_G/5 H I 1, 60 1,70 1, 6585 R / 10_G / 5 H I 1, 60 1.70 1, 65
Grenzwert für Holzpellets gemäß ONORM M 7135 2,30Limit value for wood pellets according to ONORM M 7135 2.30
Tabelle 3: Mechanische Stabilität der PelletsTable 3: Mechanical stability of the pellets
Ersichtlich ist, dass bei den Mischungen von Stroh und Glyzerin eine Verbesserung der Pelletsqualitat bei steigendem Glyzerinanteil gegeben ist. In diesem Beispiel war das Optimum bei einem Anteil im Bereich von etwa 15% erreicht. Bei noch höheren Glyzerinbeigaben tritt der bereits beschriebene Effekt ein, dass der Presswiderstand in den Matrizenbohrungen aufgrund der schmierenden Wirkung von Glyzerin zu stark absinkt und die Pellets schlecht verdichtet werden.It can be seen that in the mixtures of straw and glycerine, there is an improvement in the pellet quality with increasing glycerol content. In this example, the optimum was achieved at a level in the range of about 15%. With even higher additions of glycerol, the already described effect occurs that the pressing resistance in the die bores decreases too much due to the lubricating action of glycerol and the pellets are poorly compressed.
Trotzdem weisen alle Stroh-/Glyzennmischungen sehr niedrige Abriebwerte auf. Der Grenzwert für ONORM-gerechte Holzpellets liegt, wie erwähnt, bei 2,3%.Nevertheless, all straw / glycerine mixtures have very low abrasion values. The limit for ONORM-compliant wood pellets, as mentioned, is 2.3%.
Bei der Mischung von Rapskuchen und Glyzerin konnten ebenfalls Pellets mit guter Stabilität hergestellt werden. Die besten Pellets entstanden beim Versuch mit 20% Glyzerinbeigabe. Eine weitere Verbesserung der Pelletsqualitat bei weiter gesteigertem Glyzermanteil ist aufgrund dieser Versuche durchaus zu erwarten .The mixture of rapeseed cake and glycerine also produced pellets with good stability. The best pellets were obtained when trying with 20% glycerine. A further improvement of the pellet quality with further increased Glyzermanteil is quite to be expected on the basis of these experiments.
Die Versuche mit Beigabe von 10% Glyzerin und 5% Glukosesirup brachten bei der Strohmischung keine Verbesserung der Pelletsqualitat gegenüber der Zumischung von 10% bzw. 15% reinem Glyzerin. Bei der Untermischung zu Rapskuchen konnte eine leichte Verbesserung der Qualität gegenüber der Beimengung von 10% reinem Glyzerin erzielt werden.The experiments with the addition of 10% glycerol and 5% glucose syrup did not improve the pellet quality of the straw mixture compared to the admixture of 10% or 15% pure glycerine. When blended into rapeseed cake, a slight improvement in quality compared to the addition of 10% pure glycerin was achieved.
Die Pellets mit Rapskuchen waren nach der Verpressung weicher im Vergleich zu den Strohpellets. Die Zugabe von Glyzerin bewirkt offenbar in der Auskuhlphase eine Aushärtung der Pellets, so dass die oben dargestellten guten Abriebwerte gemessen werden .The pellets with rape cake were softer after compression compared to the straw pellets. The addition of glycerol apparently causes the pellets to cure in the cooling phase, so that the good abrasion values shown above are measured.
Die verwendete Matrize ist die mit dem im Labor verfugbaren höchsten Pressverhaltnis (längste Bohrung) . Ab einem gewissen Anteil an Glyzerin sinkt der Pressdruck: in den Bohrungen ab. Dieser Effekt kann durch die Verwendung noch längerer Bohrungen behoben werden. The die used is the highest press ratio available in the laboratory (longest bore). From a certain Proportion of glycerin decreases the pressing pressure: in the holes from. This effect can be remedied by using even longer holes.
Claims
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EP2527419A4 (en) * | 2010-01-18 | 2013-06-26 | Creative Co Ltd | SOLID FUEL |
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US10858606B2 (en) | 2017-06-13 | 2020-12-08 | Arr-Maz Products, L.P. | Structured composite wood pellets for dust/fines mitigation and method of producing them |
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