EP2365267A1 - Procédé et installation de séchage de produits en vrac humides - Google Patents

Procédé et installation de séchage de produits en vrac humides Download PDF

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Publication number
EP2365267A1
EP2365267A1 EP11157588A EP11157588A EP2365267A1 EP 2365267 A1 EP2365267 A1 EP 2365267A1 EP 11157588 A EP11157588 A EP 11157588A EP 11157588 A EP11157588 A EP 11157588A EP 2365267 A1 EP2365267 A1 EP 2365267A1
Authority
EP
European Patent Office
Prior art keywords
bulk material
layer
conveying direction
conveying
coarser
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP11157588A
Other languages
German (de)
English (en)
Other versions
EP2365267B1 (fr
Inventor
Werner Kunz
Simon Staufer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
W Kunz Drytec AG
Original Assignee
W Kunz Drytec AG
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.)
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Publication date
Application filed by W Kunz Drytec AG filed Critical W Kunz Drytec AG
Priority to EP11157588A priority Critical patent/EP2365267B1/fr
Publication of EP2365267A1 publication Critical patent/EP2365267A1/fr
Application granted granted Critical
Publication of EP2365267B1 publication Critical patent/EP2365267B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • 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
    • F26B3/04—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 circulating over or surrounding the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust

Definitions

  • the invention relates to a method for drying moist bulk material according to the preamble of claim 1.
  • the invention further relates to a system for drying moist bulk material according to the preamble of claim 8.
  • FIG. 1 Another method for drying wet bulk material.
  • a layer of wet bulk material is moved by means of a conveyor belt through a drying chamber and dried therein.
  • an upper part of the layer is removed and a lower part of the layer is separated by sieving into two partial layers. These two partial layers are applied to the conveyor belt at the beginning of the conveyor belt.
  • This method also has the disadvantage that a higher energy requirement is required for drying.
  • the object of the invention is to form a more economically advantageous method and an economically advantageous plant for drying moist bulk material.
  • the object is achieved in particular with a method for drying moist bulk material, wherein the bulk material layered is conveyed and thereby exposed to a fluid flow, wherein the wet bulk material is deposited as a first layer on a flat conveyor and moved by the conveyor in a conveying direction, and wherein at least a second layer is applied to the first layer, so that an overall layer is formed, which at least comprises the first and second layers, and wherein an upper part of the total layer is removed as a dried bulk material, and wherein the remaining part of the total layer forms a pre-dried bulk material, which is separated into a coarser bulk material and a finer bulk material, and wherein the coarser bulk material is conveyed opposite to the conveying direction, and is applied as a second layer on the first layer, and wherein the second layer with respect to the first layer in the direction of the conveying direction spaced applied to the first layer.
  • a system for drying moist bulk material comprising a planar conveying means movable in a conveying direction, comprising a first distributing device, which is designed to apply moist bulk material to the conveying means to form a flat first layer, and comprising a second distribution device configured to apply a coarser bulk material to the first layer to form a planar second layer, and comprising a first separation device arranged in the conveying direction at the end of the conveyor, the separation device being configured to form an upper part of a conveyor by removing at least the first and second layer formed total layer as a dried bulk material, wherein the remaining part of the total layer, which forms a pre-dried bulk material, a second separating device is supplied, wherein the second separating device is designed to separate the pre-dried bulk material into a coarser bulk material and a finer bulk material, and comprising a conveying device to supply the coarser bulk material of the second distribution device, wherein the second distribution device with respect to the first distribution device downstream and
  • the still moist bulk material to be dried is deposited in a planar manner on a conveying device to form a first layer and passed therefrom through a drying fluid stream, the bulk material being divided into two or more partial streams having different particle sizes after a first passage through the drying fluid stream wherein at least a partial flow is conveyed opposite to the conveying direction and is deposited on the first layer, so that at least two layers of superimposed bulk material are formed, which are passed through the drying fluid stream.
  • the partial flow is applied with respect to the first layer in the direction of the conveying direction spaced apart on the first layer, said distance is preferably at least 10% of the length of the conveying means of the conveyor.
  • the layers are preferably deposited in such a way that the layer with the smallest particle size is deposited at the top.
  • the layers of smaller particle size are applied to the conveying device in such a way that they remain on the conveying device over a shorter conveying length, in comparison with layers having a larger particle size. This is because layers of smaller particle size dry faster and therefore not so long through the to be dried Fluid flow must be promoted as layers with larger particle size, which must be exposed to the fluid to be dried longer flow.
  • An advantage of the method according to the invention is therefore to save energy during drying and / or to achieve a more homogeneous moisture content of the dried bulk material which is removed by the drying installation according to the invention.
  • At least one further layer with predried bulk material is thus applied to the first layer of moist bulk material, the further layer preferably having a larger particle size, and all layers being conveyed by the drying fluid stream.
  • a plurality of further layers of predried bulk material are deposited on the first layer, the further layers having an increasingly smaller particle size towards the top. It can be produced by a corresponding number of distributing devices, which are arranged spaced apart in the direction of the conveyor device to deposit the bulk material on the conveyor, any number of layers, as required.
  • the drying fluid preferably drying air
  • This method has the advantage that the entire system for drying moist bulk material requires no long or no additional conveying device, so that the entire system has a shorter overall length. It is also possible to reliably dry different types of moist bulk material. In addition, the drying is very energy efficient. Another advantage of the method is to see that there is less dust in the exhaust air, as small dried particles are removed relatively quickly from the drying process.
  • the inventive method thus enables energy-efficient and cost-effective drying of moist bulk material, wherein the drying system can also be made relatively short and thus can have a relatively short overall length.
  • FIG. 1 schematically shows an embodiment of the method or a system 1 for drying moist bulk material 6.
  • the moist bulk material 6 is deposited by means of a distributor 9 as a first layer 6a on a flat conveyor 2, for example a gas-permeable conveyor belt, and from the conveyor 2 in a Conveying direction 2a moves, wherein the bulk material 6 is conveyed in the form of a layer and thereby exposed to a fluid flow 5 such as warm air.
  • a fluid flow 5 such as warm air.
  • at least one second layer 6d is subsequently applied to the first layer 6a in the conveying direction 2a applied, so that an overall layer 7 is formed, which comprises at least the first and second layers 6a, 6d.
  • an upper part of the total layer 7 is removed as a dried bulk material 8 and removed from the plant 1, wherein the remaining part of the total layer 7 forms a predried bulk material 6b, which by means of a second separation device 3 in a coarser bulk material 6c and a finer bulk material 6e is separated.
  • the coarser bulk material 6c is conveyed opposite to the conveying direction 2a and applied as a second layer 6d to the first layer 6a.
  • the finer bulk material 6e is also conveyed opposite to the conveying direction 2a and applied to the second layer 6d as the uppermost layer 6f.
  • the finer bulk material 6e can also be fed directly to the dried bulk material 8 via a conveying device 16, without being additionally dried.
  • the FIG. 1 also shows conveyor lengths at the top.
  • the distance between the location L1 to which the wet bulk material 6 is applied and the location L6 at which the predried bulk material 6b is removed from the conveyor 2 defines a maximum conveying length L or L16, during which the first layer 6a on the Conveyor 2 remains.
  • the first layer 6a is thus conveyed along the maximum conveying length L in the conveying direction 2a.
  • the location L2 shows the location of the second distributor 13 and the location L5 the location of the first separator 10.
  • the maximum conveyor length L thus corresponds to the distance between the location L1 and the location L6, also referred to as L16.
  • the distance between the location L1 and the location L2 is referred to as distance L12.
  • the second Layer 6d is applied with respect to the first layer 6a by a distance L12 spaced apart on the first layer 6a, the distance L12 is at least 10% of the maximum conveying length L, and wherein the distance L12 preferably 20% and at least 20% of the maximum conveying length L is.
  • the second layer 6d thus has a shorter conveying length than the first layer 6a, or in other words, the second layer 6d is conveyed by the conveyor 2 over a shorter time than the first layer 6a. As a result, drying energy can be saved.
  • the distance L4 shows the location at which, in an advantageous embodiment, the third distribution device 14 is arranged, so that the third distribution device 14 with respect to the first distribution device 9 in the conveying direction 2a is spaced by a distance L14.
  • the distance L24 is again at least 10% of the maximum conveying length L, and preferably 20% or at least 20% of the maximum conveying length L.
  • the conveying means 2 is exposed to the drying air 5 along the entire maximum conveying length L.
  • the drying air 5 can also be supplied along a shorter section to the conveying means 2, for example only along the distance L15 or the distance L25.
  • the distance L56 may also be zero, which means that the first separating device 10 is configured such that the dried bulk material 8 and the predried bulk material 6b leave the conveying means 2 in the same direction in the conveying direction 2a.
  • FIG. 2 schematically shows a further embodiment of the method or a plant 1 for drying moist bulk material 6.
  • the method shown has the in FIG. 2 3 shows a third separating device 4, which subdivides the coarser bulk material 6c again into a very coarse bulk material 6g or partial bulk material 6g and a medium bulk material 6h or partial bulk material 6h, wherein first the very coarse bulk material 6g is deposited on the first layer 6a, so that a second layer 6d is formed, and wherein in the conveying direction 2a subsequently the middle-coarse bulk material 6h is deposited on the second layer 6d, so that a third layer 6i is formed, wherein these three layers 6a, 6d and 6i form an overall layer 7, the overall layer 7 has up against finer and preferably also drier particles.
  • the finer bulk material 6e can either be applied to the overall layer 7 or fed directly to the dried bulk material 8.
  • the fourth distribution device 15 is arranged at location L3.
  • Fig. 3 schematically shows a plant 1 for drying moist bulk material 6.
  • the plant 1 comprises a planar, movable in a conveying direction 2a conveyor 2, which is designed as a conveyor belt.
  • a first distributor device 9 comprising two screws distributes the supplied moist bulk material 6 while forming a flat first layer 6a onto the conveyor means 2.
  • a second distributor device 13 is configured in such a way and arranged to apply a coarser bulk material 6c to form a flat second layer 6d on the first layer 6a.
  • FIG. 3 also shows conveyor lengths at the top.
  • the wet bulk material is supplied at location L1.
  • the first separator 10 is located at location L6, which also corresponds to location L5, and the second distributor 13 is located at location L2.
  • the second distributing device 13 is arranged downstream of the first distributing device 9 in the conveying direction 2a and is spaced from the first distributing device 9 by a distance L12, the distance L12 being at least 10% and preferably at least 20% of the maximum conveying length L or the distance L16.
  • the plant 1 also comprises a first separating device 10 which is arranged in the conveying direction 2a at the end of the conveying means 2, wherein the separating device 10 is configured such that an upper part of a formed by at least the first and second layer 6a, 6d total layer 7 as a dried bulk material 8, wherein the remaining part of the total layer 7, which forms a predried bulk material 6b, is fed via a collecting device 17 and a screw conveyor 11 to a second separating device 3.
  • the second separating device 3 runs perpendicular to the conveying direction 2a above the conveying means 2 and is designed such that the separating device 3 simultaneously separates the predried bulk material 6b into a coarser bulk material 6c and a finer bulk material 6e by trickling out the finer bulk material 6e below and onto the conveying means 2 falls, whereas the coarser bulk material 6c is supplied to the conveyor device 12, and the second distributor 13 is supplied, which applies the coarser bulk material 6c on the conveyor 2.
  • FIG. 4 shows the in FIG. 3 illustrated Appendix 1 from above. From this point of view, in particular the course of the conveying devices 11 and 12 and the arrangement of the first and second distribution device 13 and 14 can be seen.
  • the system 1 has a cover at the top, which is why, for example, the first and second distribution device 13 and 14 is shown only in dashed lines.
  • FIGS. 5 and 6 show a further embodiment of a plant 1, wherein, in contrast to the in the FIGS. 3 and 4 1, the two screw conveyors 11 and 12 are arranged on the same side, and wherein in the region of the feed channel to the third distributor 14, the second separator 3 is arranged to separate the pre-dried bulk material 6b in the finer bulk material 6e, which the third distributor 14th is supplied, and in the coarser bulk material 6c which the second distributor 13 is supplied.
  • FIG. 7 schematically shows a method in which the coarser bulk material 6c is divided into a plurality of General conceptgütern 6g, 6h, 61, 6m with increasingly coarse grain
  • the General conceptgüter 6g, 6h, 61, 6m so applied to the moving in the direction 2a conveyor 2 be that first the Detailgut 6g with the coarsest grain size, the very coarse bulk material 6g, is applied, and that successively in the conveying direction 2a, the respective Parturgigut 6h, 61, 6m is applied with increasingly fine grain, so that the total layer 7 is formed .
  • it is possible to supply any desired number of streams of partial bulk goods 6g, 6h, 61, 6m, which in the conveying direction 2a spaced apart and preferably with decreasing in the conveying direction 2a grain on the conveyor 2 are deposited.
  • a system 1 which comprises a plurality of separation devices 3,4 for generating a plurality of streams of General—gütern 6g, 6h, 61, 6m with increasingly coarse grain size.
  • a plurality of distributing devices 13, 14, 15 are required, the separating devices 3, 4 and the distributing devices 13, 14, 15 being arranged in such a way that the partial bulk material 6 g with the coarsest grain is first applied, and in succession in the conveying direction 2 a the respective Operafact 6h, 61, 6m is applied with increasingly finer grain size.
  • FIG. 8 schematically shows a further method in which the coarser bulk material 6c is divided into a plurality of General-sectiongütern 6g, 6h, 61, 6m, 6n, 6o, .... with increasingly coarse grain. It is such a high number of streams of General-sectiongütern 6g, 6h, 6l, 6m, 6n, 6o, ....
  • a system 1 which a plurality of separation devices 3,4 for producing a plurality of General—gütern 6g, 6h, 61, 6m, 6n, 6o with increasingly coarse grain size.
  • a continuous separation device 18 is used, which is designed such that it is at least the coarser bulk material 6c into a plurality of General—gütern 6g, 6h, 6l, 6m, 6n, 6o with increasingly coarse grain to subdivide.
  • a continuous distribution device 19 is arranged and configured such that the partial bulk materials 6g, 6h, 61, 6m, 6n, 6o are applied in the conveying direction 2a continuously and with increasingly finer grain size.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP11157588A 2010-03-10 2011-03-10 Procédé et installation de séchage de produits en vrac humides Not-in-force EP2365267B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11157588A EP2365267B1 (fr) 2010-03-10 2011-03-10 Procédé et installation de séchage de produits en vrac humides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10156095 2010-03-10
EP11157588A EP2365267B1 (fr) 2010-03-10 2011-03-10 Procédé et installation de séchage de produits en vrac humides

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EP2365267A1 true EP2365267A1 (fr) 2011-09-14
EP2365267B1 EP2365267B1 (fr) 2013-01-23

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EP11157588A Not-in-force EP2365267B1 (fr) 2010-03-10 2011-03-10 Procédé et installation de séchage de produits en vrac humides

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE553427A (fr)
FR1233567A (fr) * 1959-04-03 1960-10-12 Lorraine Escaut Sa Procédé et dispositifs de séchage de matériaux fins
US6163981A (en) 1998-11-25 2000-12-26 Nilsson; Bengt Method and apparatus for drying wood particles
DE19940392A1 (de) * 1999-08-25 2001-03-01 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Reduzierung des in Faserzellen kapillar gebundenen Wassergehaltes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE553427A (fr)
FR1233567A (fr) * 1959-04-03 1960-10-12 Lorraine Escaut Sa Procédé et dispositifs de séchage de matériaux fins
US6163981A (en) 1998-11-25 2000-12-26 Nilsson; Bengt Method and apparatus for drying wood particles
DE19940392A1 (de) * 1999-08-25 2001-03-01 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Reduzierung des in Faserzellen kapillar gebundenen Wassergehaltes

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Publication number Publication date
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