EP0222925A1 - Séchoir à vapeur pour matériau fibreux essoré - Google Patents

Séchoir à vapeur pour matériau fibreux essoré Download PDF

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Publication number
EP0222925A1
EP0222925A1 EP85108114A EP85108114A EP0222925A1 EP 0222925 A1 EP0222925 A1 EP 0222925A1 EP 85108114 A EP85108114 A EP 85108114A EP 85108114 A EP85108114 A EP 85108114A EP 0222925 A1 EP0222925 A1 EP 0222925A1
Authority
EP
European Patent Office
Prior art keywords
steam
outflow
belt
heat exchanger
pressure
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
EP85108114A
Other languages
German (de)
English (en)
Other versions
EP0222925B1 (fr
Inventor
Gerd Laske
Peter Dipl.-Ing. Valentin
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.)
BMA Braunschweigische Maschinenbauanstalt AG
Original Assignee
BMA Braunschweigische Maschinenbauanstalt 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.)
Filing date
Publication date
Application filed by BMA Braunschweigische Maschinenbauanstalt AG filed Critical BMA Braunschweigische Maschinenbauanstalt AG
Priority to AT85108114T priority Critical patent/ATE49468T1/de
Priority to EP85108114A priority patent/EP0222925B1/fr
Priority to DE8585108114T priority patent/DE3575344D1/de
Priority to US06/880,165 priority patent/US4683667A/en
Publication of EP0222925A1 publication Critical patent/EP0222925A1/fr
Application granted granted Critical
Publication of EP0222925B1 publication Critical patent/EP0222925B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F26B17/08—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 arranged in a sinuous or zig-zag path
    • 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
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure

Definitions

  • the invention relates to a steam dryer for squeezed fibrous material, in particular leached, possibly pre-dried sugar beet pulp, in which the steam, which is predominantly guided by a circuit arrangement, is brought into direct contact with the material and the material is moved along a conveying path.
  • the steam required for the operation of the steam dryers can essentially be provided by the steam generation systems which are already present in the factories.
  • the steam which is predominantly passed through the steam dryer through a circuit arrangement, can, to the extent that it is withdrawn from the circuit and replaced by steam expelled from the material, to utilize the residual heat Devices are supplied, for example via heat exchangers, to the evaporation crystallization, in order in this way to achieve a further improvement in the energy yield.
  • the previously known steam dryers for pressed fibrous material such as sugar beet pulp, generally consist of a drum provided with internals and drivable about its longitudinal axis, through which the steam flows during the rotational movement, with a direct intimate contact between the steam and the fibrous material in that the material is taken along by the drum during part of the rotational movement during the drum rotation and then falls freely down through the drum interior onto the drum jacket and is thereby loosened up continuously and brought into contact with the steam.
  • Steam dryers have also become known (EP 0 058 651 A1), in which, in order to produce a cattle feed from sugar beet chips, after preheating and pressing and subsequent expansion, these are loosened and transferred into a tube through which steam flows and are thereby carried away by the steam flow.
  • the pipe through which steam flows forms part of the circuit arrangement of the dryer, which essentially consists of a meandering arrangement of steam pipes through which the entrained chips are also conveyed as a result of the steam flow, in order to prevent the meandering arrangement from exiting by means of an ab to be separated from the steam while the steam continues to be circulated, except for a small amount, which is drawn off and replaced by live steam.
  • the invention has for its object to provide a steam dryer of the type described in the introduction so that a uniform treatment of all good particles.,. and the amount of the good particles exposed to the steam per unit of time can be varied within wide limits and / or the duration of the action of the steam on the good particles can be changed within wide limits.
  • a simple structure and a maintenance-friendly design should also be achieved.
  • the steam dryer mentioned at the outset is characterized according to the invention in that a pressure pipe, which is closed at both ends and is arranged at the end, with diametrically opposite inflow and outflow devices for the steam, is provided, in one longitudinal half of which at least one heat exchanger is arranged, which is arranged over the entire flow cross-section for the steam and the other longitudinal half of which has a plurality of endless sieve belts arranged one above the other in the manner of a belt drier, which can be driven in opposite directions, for conveying and transferring the goods from belt to belt and an entry device above the top sieve belt and a discharge device for the goods below the bottom sieve belt, whereby the sieve belts form the parting plane between alternately arranged pressure and outflow chambers, from which the pressure chambers to the longitudinal half with the heat exchanger open inflow cross sections and the outflow chambers at least have outlet cross sections open to an outflow space.
  • the material layer located on the sieve belts is flowed through in a direction transverse to the layer plane.
  • the steam flows around all the good particles located on the sieve belts, the flow velocity of the steam within the layer in the individual cavities being greater than the flow velocity of the steam. Since unsaturated steam is used to operate such steam dryers, due to the strong heating of the good particles there is an increased moisture transfer from the good particles into the unsaturated steam and, as a result, a correspondingly favorable drying effect.
  • the sieve belts transfer the goods to the belt underneath, adjusting the drive speeds of the belts to adjust the layer thickness of the goods on the belts differently and to adapt them to the respective drying conditions.
  • the total dwell time of the material in the steam stream can also be set within wide limits.
  • all of the belts are acted upon in parallel by the steam supplied via the pressure chamber, and thus each of the material layers located on the sieve belts is supplied with a steam which has the same water absorption capacity when the individual material layers flow against it.
  • the individual outflow spaces each extend over the cross section of the overflow chambers.
  • the outflow spaces can reach the transition in an advantageous embodiment in the suction line of the respective blower can be divided into parallel channels assigned to the individual discharge chambers, and separately controllable throttle valves can be provided in the channels.
  • the throttle valves can then be individually adjusted so that a uniform or, if appropriate, also a stronger flow in one or the other material layer takes place by means of the steam.
  • a diffuser and cleaning screen consisting of cloth or fabric can be provided in the pressure chamber between the inflow devices for the steam and the Heat exchanger.
  • This sieve should be arranged and designed such that it is slightly inflated and agitated by the steam flow so that it cleans itself and the smaller particles and fibers retained by the sieve from the steam flow can slide down along the sieve.
  • a discharge screw is then expediently provided there below the diffuser and cleaning sieve.
  • the arrangement of the sieve belts is expediently made such that they separate the respective pressure chamber from the outflow chamber with their conveying strand and the empty strand of each sieving belt is arranged above the conveying strand of the next lower sieving belt, and that both runs over the entire flow cross-section for the steam of the pressure into the outflow chamber.
  • This ensures that the empty run with its downward-facing contact surface for the goods already delivered to the transfer point is flowed through by the steam in the direction from top to bottom and any small particles still adhering to the support surface for the material can reach the material layer of the conveying strand of the next lower screen belt with the steam flow.
  • This arrangement results in an additional cleaning effect, even though such sieve belts, as is customary in belt dryers, are additionally equipped with other mechanical cleaning devices, such as brushes or the like.
  • this heat exchanger is particularly important, for example, when using the dryer for sugar beet pulp because the chips are still wetted with syrup when they are placed on the bottom belt, from which the residual water can only be removed with the help of a higher steam temperature can.
  • the feed device for the goods can be equipped with a preheating device, which can expediently be designed as a ring screw through which steam flows.
  • the drawing shows an embodiment of the invention in a schematic representation.
  • the steam dryer shown in the figures is an embodiment of the kind used in particular for the treatment of pre-dried sugar beet pulp.
  • a pressure pipe which is closed at both ends and is generally designated 1, can be seen, which, in view of the generally very long length, is composed of several sections, each of which is connected to one another via flanges and interposed seals.
  • the pressure tube 1 is closed at the ends by dome-like end parts 2, in which, like in the individual cylindrical sections of the pressure tube, manholes which are closed by covers are provided, through which access to the interior of the pressure tube 1 is made possible for revision and repair work.
  • the pressure pipe 1 rests on a support frame 4 shown in FIGS. 3 and 4 and is equipped with diametrically opposite inflow and outflow devices, designated 5 and 6, respectively, which extend over the essential length of the pressure pipe 1, as shown in FIGS 1 and 2 can be seen.
  • a heat exchanger 7 is arranged in the inside of the pressure tube 1 in one longitudinal half, as can be clearly seen from FIGS. 3 and 4.
  • This heat exchanger 7 can be formed in several parts by a row arrangement of individual exchangers and is connected to a steam feed device not shown in the drawing.
  • a plurality of endless sieve belts which are arranged in the opposite direction and are driven in the same way as a belt dryer, are provided.
  • three sieve belts 8 are arranged one above the other.
  • the uppermost sieve belt 8 is driven in accordance with the arrow 9 shown in FIG. 1, so that the material placed on the upper run 8a of the upper sieve belt is transferred to the next lower sieve belt 8 at the end of this sieve belt by the longitudinally offset arrangement of the sieve belts provided one above the other and from there to the bottom sieve belt 8.
  • the sieve belts 8 are held in a supporting frame 9, to which partition walls 10 arranged one above the other and extending in the longitudinal direction of the pressure tube are fastened.
  • a feed device, generally designated 11, is used to feed the material to the uppermost belt 8 or its conveyor run 8a, while a discharge device, generally designated 12, is connected below the bottom sieve belt 8.
  • the input device 11 consists of a cellular wheel 13, which is arranged above a driven screw conveyor 14, which in turn opens into a shaft 15, which is located above two distributor screws 16 arranged in the pressure pipe.
  • the housing of the screw 14 is in the area above the shaft 15 connected to a steam supply line 17.
  • the screw 14 is designed as a ring screw into which the steam supplied penetrates and is preheated during the transfer of the material into the pressure tube 1.
  • the discharge device consists of a discharge screw 18 and a lock 19 adjoining it, from which the material is transferred in the direction of arrow 20 to a further conveyor not shown in the drawing.
  • the conveyor runs 8a of the sieve belts 8 thus form the parting planes between the pressure spaces 24 and the outflow spaces 25.
  • a plurality of outflow spaces 26, which are arranged separately next to one another and are each connected on the suction side to a blower 21, are provided (FIG. 2), in which the outflow chambers 25 each open without the interposition of any built-in parts.
  • the outflow spaces 26 can be divided into parallel channels, assigned to the individual outflow chambers 25, up to the transition into the suction line 22, in which separately controllable throttle valves are provided, as is indicated in FIG. 4.
  • different flow resistances occurring in the individual product layers on the conveyor runs 8a can be compensated for, so that a uniform flow through all conveyor runs 8b or all product layers located on these conveyor runs is achieved.
  • the steam passes into a continuous pressure chamber 28 which is adapted to the heat exchanger 7 and which is limited only according to FIG. 2 by lateral walls 29 adjoining the heat exchanger 7, so that the conveyed steam is forced through to flow through the heat exchanger 7 and cannot flow around it laterally.
  • the steam brought under increased pressure by the fan is heated, whereby the moisture absorption capacity of the steam is correspondingly increased.
  • funnel-shaped collecting spaces 32 are provided below the separators 31, which at the same time form calming spaces for the separated material and are connected to a discharge device for the separated material.
  • a diffuser and cleaning screen 33 shown in dashed lines made of cloth or fabric.
  • This sieve is used to separate any solid particles that may be entrained in the steam carried in the circuit and, at the same time, to make the flow more uniform.
  • a discharge screw 34 can be seen, via which the particles separated on the sieve and falling down are discharged.
  • the conveyor runs 8a of the sieve belts 8 are the respective parting plane between the pressure form chambers 24 and the outflow chambers 25.
  • the empty runs 8b belonging to the individual conveyor runs 8a are guided in the described arrangement in such a way that they are arranged directly above the conveyor run 8a of the next lower screen belt, so that the empty run 8b must first be flowed through by the steam before the steam reaches the one below it reached with the good layer conveyor strand 8a of the next lower belt. Since the empty strand 8b of the belt faces downward, small particles still adhering to it are carried along by the steam flowing through and transferred to the good layer of the conveyor strand 8a located underneath. The empty run 8b is thus cleaned, each empty run again forming a diffuser screen and contributing to the uniformity of the flow through the conveying run 8a of the next lower belt located under the empty run 8b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
EP85108114A 1985-06-29 1985-06-29 Séchoir à vapeur pour matériau fibreux essoré Expired - Lifetime EP0222925B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT85108114T ATE49468T1 (de) 1985-06-29 1985-06-29 Dampftrockner fuer abgepresstes faseriges gut.
EP85108114A EP0222925B1 (fr) 1985-06-29 1985-06-29 Séchoir à vapeur pour matériau fibreux essoré
DE8585108114T DE3575344D1 (de) 1985-06-29 1985-06-29 Dampftrockner fuer abgepresstes faseriges gut.
US06/880,165 US4683667A (en) 1985-06-29 1986-06-30 Steam dryer for pressed fibrous material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85108114A EP0222925B1 (fr) 1985-06-29 1985-06-29 Séchoir à vapeur pour matériau fibreux essoré

Publications (2)

Publication Number Publication Date
EP0222925A1 true EP0222925A1 (fr) 1987-05-27
EP0222925B1 EP0222925B1 (fr) 1990-01-10

Family

ID=8193597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85108114A Expired - Lifetime EP0222925B1 (fr) 1985-06-29 1985-06-29 Séchoir à vapeur pour matériau fibreux essoré

Country Status (4)

Country Link
US (1) US4683667A (fr)
EP (1) EP0222925B1 (fr)
AT (1) ATE49468T1 (fr)
DE (1) DE3575344D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599129A1 (fr) * 1986-05-20 1987-11-27 Dornier Gmbh Lindauer Dispositif de sechage d'une matiere defilant sous forme d'une nappe continue
EP0505677A1 (fr) * 1991-03-25 1992-09-30 BUCHER-GUYER AG Maschinenfabrik Séchoir à tapis comportant plusieurs compartiments à vide avec pompage différentiel
CN110006240A (zh) * 2019-05-10 2019-07-12 黎柴佐 一种多级粉体干燥处理装置及其方法
CN116817571A (zh) * 2023-08-31 2023-09-29 福建省锐丰源实业有限公司 一种石材烘干装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4390972B2 (ja) * 2000-05-12 2009-12-24 株式会社冨士製作所 麺の熱風乾燥装置
CN106643092A (zh) * 2016-12-10 2017-05-10 湖北沛丰粮油股份有限公司 一种凉米机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058651A1 (fr) * 1981-02-11 1982-08-25 Svensk Exergiteknik AB Méthode pour fabriquer le fourrage de boeuf et usine pour exécuter la méthode
DE3414853A1 (de) * 1983-06-02 1984-12-06 W. Kunz AG Maschinen- und Apparatebau, Dintikon Verfahren und anlage zum kontinuierlichen trocknen eines gutes
DE3321178A1 (de) * 1983-06-11 1984-12-13 IPRO Industrieprojekt GmbH, 3300 Braunschweig Verfahren zur niedertemperatur-trocknung von vorentwaesserten ruebenschnitzeln

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE309899B (fr) * 1963-09-03 1969-04-08 Svenska Flaektfabriken Ab
US3374106A (en) * 1964-05-14 1968-03-19 Proctor & Schwartz Inc Material drying method and apparatus
DE2716086B2 (de) * 1977-04-12 1980-06-04 Babcock-Bsh Ag Vormals Buettner- Schilde-Haas Ag, 4150 Krefeld Durchlauftrockner für bahn- oder blattförmiges Gut
US4462170A (en) * 1982-05-21 1984-07-31 Whirlpool Corporation Sump for lint screen cleaner and storage system for a dryer
US5292088A (en) * 1989-10-10 1994-03-08 Lemont Harold E Propulsive thrust ring system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058651A1 (fr) * 1981-02-11 1982-08-25 Svensk Exergiteknik AB Méthode pour fabriquer le fourrage de boeuf et usine pour exécuter la méthode
DE3414853A1 (de) * 1983-06-02 1984-12-06 W. Kunz AG Maschinen- und Apparatebau, Dintikon Verfahren und anlage zum kontinuierlichen trocknen eines gutes
DE3321178A1 (de) * 1983-06-11 1984-12-13 IPRO Industrieprojekt GmbH, 3300 Braunschweig Verfahren zur niedertemperatur-trocknung von vorentwaesserten ruebenschnitzeln

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Sektion Mechanik, Woche E35, 13. Oktober 1982, Zusammenfassungsnr. 74224 J08 Q76, Derwent Publications, Ltd., London, GB; & SU - A - 877 270 (POTATO PROD SUPPLY) 30.10.1981 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599129A1 (fr) * 1986-05-20 1987-11-27 Dornier Gmbh Lindauer Dispositif de sechage d'une matiere defilant sous forme d'une nappe continue
EP0505677A1 (fr) * 1991-03-25 1992-09-30 BUCHER-GUYER AG Maschinenfabrik Séchoir à tapis comportant plusieurs compartiments à vide avec pompage différentiel
CN110006240A (zh) * 2019-05-10 2019-07-12 黎柴佐 一种多级粉体干燥处理装置及其方法
CN116817571A (zh) * 2023-08-31 2023-09-29 福建省锐丰源实业有限公司 一种石材烘干装置
CN116817571B (zh) * 2023-08-31 2023-11-28 福建省锐丰源实业有限公司 一种石材烘干装置

Also Published As

Publication number Publication date
ATE49468T1 (de) 1990-01-15
EP0222925B1 (fr) 1990-01-10
DE3575344D1 (de) 1990-02-15
US4683667A (en) 1987-08-04

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