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WO1998022765A1 - Procede de sechage - Google Patents

Procede de sechage Download PDF

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Publication number
WO1998022765A1
WO1998022765A1 PCT/NO1997/000308 NO9700308W WO9822765A1 WO 1998022765 A1 WO1998022765 A1 WO 1998022765A1 NO 9700308 W NO9700308 W NO 9700308W WO 9822765 A1 WO9822765 A1 WO 9822765A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
heat
drying medium
cooling
air
Prior art date
Application number
PCT/NO1997/000308
Other languages
English (en)
Inventor
Jan Øyvind AALEN
Original Assignee
Abb Miljø As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Miljø As filed Critical Abb Miljø As
Priority to AU50712/98A priority Critical patent/AU5071298A/en
Publication of WO1998022765A1 publication Critical patent/WO1998022765A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle

Definitions

  • the present invention is related to a method for drying moisturise organic material, such as feed pellets for breeding s fish, by means of warm dry air or gas, which substantially decreases the energy consumption as well as operational problems for the drying process.
  • the drying of the material is performed in a dryer of a known type where the material is fed through the dryer by means 10 of a conveyor grating or corresponding device where a preheated drying medium may penetrate the material in an upwardly or downwardly flow direction and at a velocity which ensures no movement of the material .
  • Latent heat in the used drying air may be liberated by cooling the air and condensation of supplied vapour.
  • the simplest method for drying material is as mentioned to warm up fresh air to a convenient drying temperature, such as
  • a known improvement of this method is to send the drying air through the material in several steps whereby used drying air is reheated to a new drying temperature (from 56 °C to 75 °C) between each step.
  • the drying capacity of the air is utilized much better, the requirement for air and energy in the drying process is decreased substantially in relation to the most primitive method.
  • the environment is polluted by dust s and smell from the discharged air even with this method.
  • a substantial disadvantage with this method is that the used drying air to be reheated between each drying step, may contain organic dust which sticks to and burns to the heating elements passed by the air. This may and often will mean a substantial problem for ⁇ o maintenance. In connection with drying of pellets to be used as food for fish breeding, self ignition and fire has been reported as a result of such deposition of dust in heating elements.
  • a further improvement of the energy consumption in the process may be achieved by circulating the drying air in a closed is circuit where the air is cooled down in such a way that evaporated water from the drying material is condensed whereafter the air is heated up to the drying temperature again, by means of a heat pump. Cooling and condensation are performed in the evaporation circuit of the heat pump and new heating of the drying air is
  • the vaporizer temperature of the heat pump has to be brought down below the lowest necessary air temperature for condensation so of water vapour (for example 20 °C), and the condensation temperature correspondingly must be brought above the highest necessary air temperature (for example 75 °C) to achieve the desired drying effect. This means a large temperature range even for a heat pump resulting in a low effect factor for the heat
  • the present invention is concerned with a drying process including a recirculating drying air or drying gas where the progress of the temperature progress and the temperature differences in the process are utilized to cover a substantial part of the requirement for heat and cooling during the process 5 by simple and cheap heat exchange, whereas only a residual requirement is covered by means of a heat pump.
  • This substantially reduces the price as well as the energy requirement for the process, and also the requirement for cooling connected with surplus and energy.
  • the process also comprises a mechanical dust separator and/or filter to capture dust taken up by the drying air from the material to be dried. Such dust in connection with condensation of water vapour may give the cooling surfaces in the system problems as s to deposit and due to this problems as to operation of the process.
  • figure 1 disclosing schematically a block diagram of a plant and figure 2 discloses o schematically the heating balance in a temperature-enthalpy diagram.
  • the dryer 1 is of a well known type and is not part of the invention.
  • the material to be dried is fed through the dryer by means of a conveyor or such through which the drying air can 5 penetrate.
  • the direction of the drying air should be downwardly as this provides less dust which again means material loss.
  • an upward direction of the air also is common and does not change the method according to the invention.
  • Deposited dust is separated o in a dynamic dust separator 2 and possibly a dust filter 3.
  • the used drying air is cooled down in a heat exchanger 4 which again transforms heat to a corresponding heat exchanger 11 for reheating the cooled drying air.
  • heat exchangers are designed and arranged such in the process that the air input 5 temperature to the heat exchanger 4 is higher than the air temperature out of the heat exchanger 11 and correspondingly that the air temperature out of the heat exchanger 4 is higher than the air temperature into the heat exchanger 11. Provisions are made to achieve counter current heat exchange in heat exchanger 4 as well as in heat exchanger 11 for efficient utilization of the temperature differences.
  • heat exchangers may be arranged as indirect heat exchangers.
  • the heat is transferred by a liquid, preferably water, circulating between the heat exchangers by means of pump 10 as this normally provides a suitable arrangement of the plant.
  • Condensation of water normally starts in the heat exchanger 4 which is equipped with a condensate collecting pan and drainage of the condensation water. Cooling of the used drying air continues in the heat exchanger 5, being the vaporizer of the heat pump 9. This also results in condensation.
  • the emitted heat in the evaporator/heat exchanger 5 is pumped up in temperature by the heat pump 9 and provides together with the energy consumption of the heat pump 9 is delivered to the heat exchanger 12 which is the condensator of the heat pump for further heating of the drying air.
  • the last cooling of the used drying air is made by cooling water in the heat exchanger 6.
  • surplus heat in the system is removed, substantially based on the energy supply from the heat pump 9 and the fan 7.
  • the drying air is circulated in the system by means of the fan 7 which preferably, but not necessarily, may be arranged as shown. It is desired to maintain such a drying system at underpressure to prevent humid air and troublesome smell penetrating into the factory premises. There always will exist openings and untight connections in such a system, especially at the input and output feeding openings for the material in the dryer 1.
  • the system therefore comprises a small evacuation fan 8 pulling a small part flow of the air to be cleaned for smell through a device 13 which can be an active carbon filter or the like. With this arrangement the pressure in the plant is controlled.
  • the heating balance of the system according to the present invention is disclosed principally in the temperature/en- thalpy diagram in figure 2.
  • a heating
  • b cooling
  • c cooling and condensation
  • d air in the dryer
  • e air out of the dryer
  • f the fan energy
  • g is supplied heat in the heat exchanger 12 in figure 1, which is equal to the heat out of the heat exchanger 5 plus the heat pump energy.
  • h means supplied heat in the heat exchanger 11 which again is equal to the transferred amount of heat
  • i discloses the heat from the heat exchanger 4 which is equal to the supplied heat
  • j discloses the amount of heat from the heat exchanger 5 to the heat pump
  • k discloses the cooling in the heat exchanger 6.
  • the heat exchangers 5 and 6 may be interchanged in such a way that the evaporator of the heat pump provides the last cooling. In such a case the increase of the temperature in the heat pump circuit and thereby also the energy consumption of the heat pump 9, is increased.
  • This invention will in all circumstances comprise the principle to transfer a substantial part of the heat from the cooling side to the heating side of the process by means of a cheap and energy saving indirect heat exchange.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Procédé permettant de sécher un matériau organique humide, tel que des granulés de nourriture pour poisson d'écloserie, avec de l'air ou du gaz sec chaud, dans un système de circulation sensiblement fermé en ce qui concerne le milieu de séchage. Selon le procédé, on refroidit le milieu de séchage, on condense l'eau/le fluide rendu par le matériau, on réchauffe le milieu de séchage, puis, par un simple échange indirect de chaleur, on transfère au côté chauffage du milieu de séchage une partie de la chaleur provenant du coté refroidissement.
PCT/NO1997/000308 1996-11-19 1997-11-19 Procede de sechage WO1998022765A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU50712/98A AU5071298A (en) 1996-11-19 1997-11-19 Drying method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO964918A NO964918L (no) 1996-11-19 1996-11-19 FremgangsmÕte ved t÷rking
NO964918 1996-11-19

Publications (1)

Publication Number Publication Date
WO1998022765A1 true WO1998022765A1 (fr) 1998-05-28

Family

ID=19900075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1997/000308 WO1998022765A1 (fr) 1996-11-19 1997-11-19 Procede de sechage

Country Status (3)

Country Link
AU (1) AU5071298A (fr)
NO (1) NO964918L (fr)
WO (1) WO1998022765A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780491A1 (fr) * 1998-06-24 1999-12-31 Gilbert Alibert Procede de sechage par traitement de l'air en circuit ferme et dispositif de mise en oeuvre
DE19903313A1 (de) * 1999-01-28 2000-08-10 Edwin Eisenegger Verfahren zum Herstellen von Mischfutter in verdichteter Form und Vorrichtung zum Durchführen desselben
WO2001084067A1 (fr) * 2000-05-02 2001-11-08 Arvidsson Boerje Installation de sechage de produits contenant de l'humidite
CN1313384C (zh) * 2002-08-15 2007-05-02 华懋科技股份有限公司 挥发性有机废水浓缩处理系统
EP1790929A1 (fr) * 2005-11-25 2007-05-30 Susanne Cramer Procédé et dispositif de séchage de matériaux en vrac à partir de substances solides ou à broyer
ITBG20090054A1 (it) * 2009-10-13 2011-04-14 Francom S R L Impianto per la deumidificazione, mediante aria deumidificata e riscaldata, dei fanghi disidratati meccanicamente.
CN101487662B (zh) * 2008-01-16 2012-01-04 凌建军 废热循环利用型高效节能烘干机
EP2300767A4 (fr) * 2008-06-04 2014-10-15 Erma Eero Système de séchage à circulation de gaz
EP2910882A1 (fr) * 2014-02-03 2015-08-26 Kordecka, Wieslawa Machine de séchage permettant le séchage d'objets mouillés avec circulation de fluide de séchage et procédé de protection de la pompe à chaleur de la machine de séchage pour le séchage d'objets humides contre la surchauffe
NO20160293A1 (en) * 2016-02-19 2017-08-21 Float Biopro As System and process for drying loose bulk material
EP3341668A2 (fr) * 2015-08-27 2018-07-04 Marcold Group S.r.l. Appareil et procédé de séchage et de refroidissement de graines
CN109489374A (zh) * 2018-11-22 2019-03-19 华电电力科学研究院有限公司 一种粉煤灰热泵循环干燥收集系统及方法
WO2023242483A1 (fr) * 2022-06-17 2023-12-21 Spinnova Oyj Procédé de récupération d'énergie thermique dans un processus de séchage de matériau, système de récupération de chaleur et agencement de séchage de matériau

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064099A (en) * 1979-11-29 1981-06-10 Prestcold Ltd Dehumidifier; Air Conditioner; Drier
GB2186959A (en) * 1984-03-23 1987-08-26 Sheffield Metropolitan Distric Dehumidifier incorporating a heat exchanger
WO1993021489A1 (fr) * 1992-04-10 1993-10-28 Khanh Dinh Procede et systeme de sechage a boucle fermee
WO1994020804A1 (fr) * 1993-03-04 1994-09-15 Sinvent As Procede et appareil de sechage de matieres renfermant des constituants volatils

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064099A (en) * 1979-11-29 1981-06-10 Prestcold Ltd Dehumidifier; Air Conditioner; Drier
GB2186959A (en) * 1984-03-23 1987-08-26 Sheffield Metropolitan Distric Dehumidifier incorporating a heat exchanger
WO1993021489A1 (fr) * 1992-04-10 1993-10-28 Khanh Dinh Procede et systeme de sechage a boucle fermee
WO1994020804A1 (fr) * 1993-03-04 1994-09-15 Sinvent As Procede et appareil de sechage de matieres renfermant des constituants volatils

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2780491A1 (fr) * 1998-06-24 1999-12-31 Gilbert Alibert Procede de sechage par traitement de l'air en circuit ferme et dispositif de mise en oeuvre
DE19903313A1 (de) * 1999-01-28 2000-08-10 Edwin Eisenegger Verfahren zum Herstellen von Mischfutter in verdichteter Form und Vorrichtung zum Durchführen desselben
EP1023844A3 (fr) * 1999-01-28 2003-11-19 Edwin Eisenegger Procédé de fabrication d'un fourrage mixte concentré et installation pour sa réalisation
WO2001084067A1 (fr) * 2000-05-02 2001-11-08 Arvidsson Boerje Installation de sechage de produits contenant de l'humidite
CN1313384C (zh) * 2002-08-15 2007-05-02 华懋科技股份有限公司 挥发性有机废水浓缩处理系统
EP1790929A1 (fr) * 2005-11-25 2007-05-30 Susanne Cramer Procédé et dispositif de séchage de matériaux en vrac à partir de substances solides ou à broyer
CN101487662B (zh) * 2008-01-16 2012-01-04 凌建军 废热循环利用型高效节能烘干机
EP2300767A4 (fr) * 2008-06-04 2014-10-15 Erma Eero Système de séchage à circulation de gaz
ITBG20090054A1 (it) * 2009-10-13 2011-04-14 Francom S R L Impianto per la deumidificazione, mediante aria deumidificata e riscaldata, dei fanghi disidratati meccanicamente.
EP2910882A1 (fr) * 2014-02-03 2015-08-26 Kordecka, Wieslawa Machine de séchage permettant le séchage d'objets mouillés avec circulation de fluide de séchage et procédé de protection de la pompe à chaleur de la machine de séchage pour le séchage d'objets humides contre la surchauffe
EP3341668A2 (fr) * 2015-08-27 2018-07-04 Marcold Group S.r.l. Appareil et procédé de séchage et de refroidissement de graines
NO20160293A1 (en) * 2016-02-19 2017-08-21 Float Biopro As System and process for drying loose bulk material
NO343722B1 (en) * 2016-02-19 2019-05-20 Float Biopro As System and process for drying loose bulk material, and a drying unit therefore
US10753684B2 (en) 2016-02-19 2020-08-25 Float Biopro As System and process for drying loose bulk material
CN109489374A (zh) * 2018-11-22 2019-03-19 华电电力科学研究院有限公司 一种粉煤灰热泵循环干燥收集系统及方法
WO2023242483A1 (fr) * 2022-06-17 2023-12-21 Spinnova Oyj Procédé de récupération d'énergie thermique dans un processus de séchage de matériau, système de récupération de chaleur et agencement de séchage de matériau

Also Published As

Publication number Publication date
AU5071298A (en) 1998-06-10
NO964918L (no) 1998-05-20
NO964918D0 (no) 1996-11-19

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