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WO1996007069A1 - Dispositif a lit fluidise servant a secher des produits ayant une forte propension a l'agglomeration et utilisation dudit appareil - Google Patents

Dispositif a lit fluidise servant a secher des produits ayant une forte propension a l'agglomeration et utilisation dudit appareil Download PDF

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Publication number
WO1996007069A1
WO1996007069A1 PCT/EP1995/003267 EP9503267W WO9607069A1 WO 1996007069 A1 WO1996007069 A1 WO 1996007069A1 EP 9503267 W EP9503267 W EP 9503267W WO 9607069 A1 WO9607069 A1 WO 9607069A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluidized bed
bed apparatus
plate
granules
base
Prior art date
Application number
PCT/EP1995/003267
Other languages
German (de)
English (en)
Inventor
Jan Van Den Meersche
Bernd Larson
Original Assignee
Henkel Kommanditgesellschaft Auf Aktien
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 Henkel Kommanditgesellschaft Auf Aktien filed Critical Henkel Kommanditgesellschaft Auf Aktien
Publication of WO1996007069A1 publication Critical patent/WO1996007069A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/44—Fluidisation grids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F26B3/082—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed arrangements of devices for distributing fluidising gas, e.g. grids, nozzles

Definitions

  • Fluid bed apparatus for drying products with strong agolomization and using the apparatus
  • the invention relates to a fluidized bed apparatus for products with a strong tendency to agglomerate, which has a substantially horizontal bottom and an inlet and an outlet for the product.
  • the outlet for the product is also referred to below as the product outlet.
  • the fluidizing gas flows upwards through openings in the floor.
  • Fluidized bed apparatus are used for a variety of processes, e.g. B. for drying, moistening, heating, cooling, sublimation, desublimation, absorbing, desorbing and coating. Fluidized bed drying is of greatest importance, which is often used because of the high temperature constancy of the fluidized bed, if the solid is to be dried as gently and evenly as possible.
  • the present invention relates in particular to a fluidized bed apparatus provided for drying and cooling granules.
  • annular openings are covered by circular disks which are mounted on the floor via spacer disks.
  • the fluidizing gas which usually consists of air, flows through the annular openings into the gap formed between the base and the plates and from there radially outwards. If the fluidized bed apparatus is operated with such an inflow base, the nozzles are not clogged, but an increased formation of agglomerates is found.
  • the agglomerates which do not correspond to the desired grain size have to be sieved out and thus represent a proportion of the product which can only be used after further treatment, for example grinding and recycling.
  • REPLACEMENT BLA ⁇ (RULE 26)
  • the invention is therefore based on the object of significantly reducing the proportion of agglomerates in a fluidized bed apparatus of the type mentioned at the outset and also substantially reducing the caking of the product and in particular the clogging of the openings in the inflow floor.
  • the invention should also be able to be implemented by simple, quick and inexpensive retrofitting of known fluidized bed apparatuses.
  • openings in the floor are covered by essentially horizontal plates which lie above and at a distance from the floor and have, at least on average, flow characteristics directed towards the product outlet.
  • the inflow base is therefore equipped with plate nozzles, which, in contrast to the prior art, preferably let the fluidizing gas flow in the direction of the product outlet.
  • the plates covering the openings in the inflow floor prevent the openings from becoming blocked.
  • the growth of agglomerates produced in previous process steps is reduced. An increase in these larger particles, such as lumps and school pen, by rolling in product debris only occurs to a very limited extent since the residence time of larger product particles in the fluidized bed is greatly reduced. On the other hand, due to the shorter dwell time, the formation of new agglomerates is considerably reduced.
  • the invention can be used both for inflow floors with and without vibration promotion. Even without the promotion of vibrations, the agglomerates introduced from upstream process stages are quickly transported to the product outlet. Since they cannot increase significantly with the short residence time achieved according to the invention, they are sufficiently fluidized and discharged with the rest of the product stream.
  • the uniform distribution of the fluidizing gas over the inflow floor over the long term allows the required amounts of fluidizing gas and heating energy to be reduced.
  • the dryer can be completely emptied at the end of production without any cleaning effort.
  • At least part of the half of the gap between the plate and the floor facing away from the product outlet is preferably filled with a body and thus closed.
  • the gap at the corresponding part of the plate circumference is closed, so that the filler is flush with the plate rim.
  • the corresponding part of the gap between the plate and the bottom is filled with a sheet metal, which is preferably fixed in position with the fastening element for the plate.
  • the sheet has the shape of a semicircle.
  • the cleaning of the inflow floor is only necessary at relatively large intervals.
  • the inflow floor In the case of the fluidized bed apparatus used on an industrial scale, the inflow floor must be entered by the cleaning staff. Bending of the nozzle plate and deformation of its fastenings with the consequence of irregular gap widths and an uneven air distribution can be avoided if the sheet metal between the inflow floor and the plate projects a tongue protruding into the unfilled part of the gap. points, the thickness of which is equal to the sheet thickness. The tongue supports the plate in the area of the air outlet gap against mechanical loads.
  • the invention further consists in the use of the fluidized bed apparatus mentioned for drying and / or cooling sticky granules, which tend to form agglomerates, in particular granules which are active in washing and cleaning. Due to their surfactant content, these granules are particularly prone to agglomerate formation and caking.
  • the fluidized bed apparatus according to the invention is particularly suitable for drying and / or cooling granules which are a non-surfactant liquid component and surfactants or surfactants from the group of anionic, nonionic, amphoteric and cationic surfactants, preferably anionic surfactants, in particular fatty alkyl sulfates, C9- C13-alkylbenzenesulfonates and sulfofatty acid methyl esters, and / or nonionic surfactants, in particular liquid ethoxylated fatty alcohols containing 2 to 8 ethylene oxide groups per mole of alcohol.
  • anionic surfactants in particular fatty alkyl sulfates, C9- C13-alkylbenzenesulfonates and sulfofatty acid methyl esters
  • nonionic surfactants in particular liquid ethoxylated fatty alcohols containing 2 to 8 ethylene oxide groups per mole of alcohol.
  • the fluidized bed apparatus In a further use of the fluidized bed apparatus according to the invention, it is used for drying and / or cooling compacted granules which are used in detergents and cleaning agents and which are produced from a premix by extrusion and division of the extruded strand to the desired granule size have been.
  • Such granules are described in more detail, for example, in WO 91/02047.
  • the granules are extruded from homogeneous premixes with the addition of a plasticizer and / or lubricant through hole shapes with opening widths of the predetermined granule dimension at high pressures between 25 and 200 bar.
  • the strand After exiting the hole shape, the strand is cut to the predetermined granule size by means of a cutting device. After rounding off the edges in a rounding device, the granules are adjusted to the desired residual water content in a fluidized bed dryer. The granules can then be cooled in the fluidized bed apparatus.
  • the fluidized bed apparatus according to the invention can be used particularly advantageously in this process.
  • REPLACEMENT BLA ⁇ (RULE 26) rounded extrudates contain a proportion of larger agglomerates in the form of lumps and slugs formed in the previous process stages. It is particularly important in the process that the agglomerates introduced into the fluidized bed dryer do not continue to grow.
  • FIG. 1 shows a section of the inflow floor according to the invention with a plate nozzle in a perspective view.
  • the floor was converted according to the invention.
  • a plate 1 is fastened on the inflow base 2 with a screw 3.
  • the inflow base 2 has two half-ring-shaped openings 4 below the plate 1, of which one opening 4 can be seen in FIG.
  • the other opening is covered by a molded sheet 5 lying between the inflow base 2 and the plate 1.
  • the Form ⁇ sheet 5 is held by the same screw 3 and pressed by the plate 1 against the inflow floor. It has the shape of a semicircle with a tongue 6 protruding outwards.
  • the shaped sheet 5 fulfills three tasks. On the one hand, it serves as a spacer in order to ensure a fixed distance between the plate 1 and the inflow base 2. In the case of the retrofit of the inflow floor mentioned, the semicircular part of the shaped plate also covers the half-ring-shaped opening in the inflow floor, which is not visible in FIG. A newly made floor would of course only have the semi-ring-shaped opening visible in FIG. 1, but not the covered opening. In both cases, the same shaped sheet is used to protect the gap from caking and clogging.
  • the third task of the shaped plate is the mechanical stabilization of the plate and the screw 3 by the tongue
  • the fluidizing air emerges in the direction of the arrows 7 from the gap formed by the plate 1 and the inflow base 2.
  • the resultant of the flows points approximately to the product outlet not shown in FIG. 1.
  • the spacer provided in the known inflow floor between plate 1 and inflow floor 2 must be removed and the shaped plate 5 placed in its place. It is so aligned that the tongue 6 points in the direction of the product outlet. It is not necessary for the tongue 6 of each shaped plate 5 to be aligned exactly in this direction, as long as it is ensured that the flows emerging from the plate nozzles are directed towards the product outlet on average.
  • a zigzag or meandering flow field can be provided above the inflow floor in order to prevent the granules which are fed in when the fluidized bed apparatus is started from shooting through directly from the inlet to the outlet without a sufficient dwell time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Le dispositif à lit fluidisé comprend une base (2) sensiblement horizontale, ainsi qu'un orifice d'admission et un orifice de sortie pour le produit (évacuation du produit). Pendant le fonctionnement de l'appareil, un gaz de fluidification s'écoule de bas en haut en passant par des orifices (4) pratiqués dans la base (2). Ces orifices (4) pratiqués dans la base (2) sont recouverts par des disques (1) sensiblement horizontaux, munis d'ajutages et situés au-dessus et à distance de la base (2), et présentent une caractéristique d'écoulement dirigée du moins en moyenne vers la sortie du produit. La part d'agglomérats est considérablement réduite. Le collage du produit et notamment l'obturation des orifices situés dans la base d'afflux sont sensiblement réduits. Les dispositifs à lit fluidisé connus sont faciles, rapides et économiques à reconvertir.
PCT/EP1995/003267 1994-08-26 1995-08-17 Dispositif a lit fluidise servant a secher des produits ayant une forte propension a l'agglomeration et utilisation dudit appareil WO1996007069A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4430421.8 1994-08-26
DE19944430421 DE4430421A1 (de) 1994-08-26 1994-08-26 Wirbelschichtapparat zum Trocknen von Produkten mit starker Agglomerationsneigung und Verwendung des Apparats

Publications (1)

Publication Number Publication Date
WO1996007069A1 true WO1996007069A1 (fr) 1996-03-07

Family

ID=6526690

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/003267 WO1996007069A1 (fr) 1994-08-26 1995-08-17 Dispositif a lit fluidise servant a secher des produits ayant une forte propension a l'agglomeration et utilisation dudit appareil

Country Status (2)

Country Link
DE (1) DE4430421A1 (fr)
WO (1) WO1996007069A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192644A (en) * 1962-03-02 1965-07-06 Fawkham Dev Ltd Fluidized bed apparatus
LU52974A1 (fr) * 1966-02-14 1967-08-14
DE1917047A1 (de) * 1968-04-05 1969-11-13 Aux De La Ind S A Empresa Vorrichtung zur Einfuehrung und Steuerung der Richtungsverteilung des Stroemungsmittels in Wirbelschichten
WO1991002047A1 (fr) * 1989-08-09 1991-02-21 Henkel Kommanditgesellschaft Auf Aktien Fabrication de granules comprimes pour produits de lavage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192644A (en) * 1962-03-02 1965-07-06 Fawkham Dev Ltd Fluidized bed apparatus
LU52974A1 (fr) * 1966-02-14 1967-08-14
DE1917047A1 (de) * 1968-04-05 1969-11-13 Aux De La Ind S A Empresa Vorrichtung zur Einfuehrung und Steuerung der Richtungsverteilung des Stroemungsmittels in Wirbelschichten
WO1991002047A1 (fr) * 1989-08-09 1991-02-21 Henkel Kommanditgesellschaft Auf Aktien Fabrication de granules comprimes pour produits de lavage

Also Published As

Publication number Publication date
DE4430421A1 (de) 1996-02-29

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