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WO2001067016A1 - Procede et dispositif pour le sechage direct de particules - Google Patents

Procede et dispositif pour le sechage direct de particules Download PDF

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Publication number
WO2001067016A1
WO2001067016A1 PCT/EP2001/002379 EP0102379W WO0167016A1 WO 2001067016 A1 WO2001067016 A1 WO 2001067016A1 EP 0102379 W EP0102379 W EP 0102379W WO 0167016 A1 WO0167016 A1 WO 0167016A1
Authority
WO
WIPO (PCT)
Prior art keywords
dryer
combustion chamber
exhaust gas
gas stream
particles
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.)
Ceased
Application number
PCT/EP2001/002379
Other languages
German (de)
English (en)
Inventor
Werner Schmidt
Frank Thiedemann
Holger Zierholz
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.)
Metso Panelboard GmbH
Original Assignee
Valmet Panelboard GmbH
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 Valmet Panelboard GmbH filed Critical Valmet Panelboard GmbH
Priority to AU58258/01A priority Critical patent/AU5825801A/en
Publication of WO2001067016A1 publication Critical patent/WO2001067016A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/106—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure, e.g. its axis, being substantially straight and horizontal, e.g. pneumatic drum dryers; the drying enclosure consisting of multiple substantially straight and horizontal stretches
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure

Definitions

  • the present invention relates to a method for the direct drying of particles, such as wood chips, wood fibers or the like, in which hot gases are generated in a combustion chamber, which are fed as a hot gas stream to a dryer, the particles are also introduced into the dryer and in the dryer are dried by direct contact with the hot gases, the dried particles are removed from the dryer in an exhaust gas stream and then separated from the exhaust gas stream, and the remaining exhaust gas stream contaminated with fine dust and odorous substances is at least partially reintroduced into the combustion chamber.
  • particles such as wood chips, wood fibers or the like
  • the invention is directed to a device for the direct drying of particles, such as wood chips, wood fibers or the like, with a combustion chamber for generating heating gases, a dryer connected to the combustion chamber via a hot gas pipe, on the input side provided with a feed unit for the particles, one of which Separator unit connected downstream of the dryer for separating the dried particles from an exhaust gas stream loaded with fine dust and odorous substances, as well as a gas duct leading the exhaust gas stream from the separating unit to the combustion chamber, in particular for carrying out the method mentioned at the beginning.
  • the particles can also be formed by other bulk materials emitting odors or organic carbon compounds (gaseous and aerosol compounds), for example in the form of beet pulp, fish meal, cereals, fertilizers, rubber granules and sewage sludge.
  • a drying system with a dryer heated directly by flue gases is known, the flue gases in a combustion chamber upstream in the dryer.
  • a cyclone dedusting is provided for the exhaust gases leaving the dryer, by means of which the exhaust gas stream leaving the dryer is divided into two partial streams.
  • One of the partial streams is returned to the combustion chamber, where it is injected into the hottest zone to burn the residues of fine dust and odorous substances, so that there is intensive mixing with the flue gases, which are then returned to the dryer.
  • the other partial flow is excess due to the evaporation performance of the dryer and the technologically compliant mass balance and is released into the atmosphere via an exhaust pipe.
  • the problem here is that the exhaust gas partial stream released into the atmosphere contains pollutants, which either cause pollution of the environment or which must be reduced by filtering.
  • the present invention has for its object to develop the method and the device of the type mentioned in such a way that they work particularly low emissions and at the same time economically.
  • the part of this object relating to the method is achieved according to the invention in that a partial flow of the exhaust gas flow is divided off before the introduction of the remaining exhaust gas flow into the combustion chamber and in that this partial flow is returned past the combustion chamber to the dryer.
  • the part of the task relating to the device is achieved on the basis of a device of the type mentioned in the introduction in that branches off a branch line, via which a partial stream of the exhaust gas stream is returned past the combustion chamber to the dryer.
  • the partial flow is mixed with the hot gas flow emerging from the combustion chamber before it enters the dryer.
  • the partial flow is thus returned directly to the dryer, so that the process according to the invention can be carried out very economically.
  • a section of the hot gas pipeline on the combustion chamber side can run from the combustion chamber to a first inlet of a mixing chamber, with a Output of the mixing chamber is connected to the dryer via a section of the hot gas pipeline on the dryer side, and a branch line branches off from the gas circulation line and is connected to a second inlet of the mixing chamber.
  • the main drying of the particles takes place in the dryer, a partial hot gas stream being separated from the still unmixed hot gas stream emerging from the combustion chamber and used for direct predrying of the particles.
  • the pre-drying takes place in particular at a lower temperature than the main drying.
  • the main drying of the particles to take place in the dryer and for the partial stream to be used as a hot gas partial flow for direct predrying of the particles before it is ultimately at least partially returned to the dryer.
  • Typical temperature values for the main drying are combustion chamber temperatures of over approx. 750 ° C., in particular more than approx. 800 ° C., so that the fine dust supplied to the combustion chamber with the partial exhaust gas stream and the odorous substances are completely burned.
  • the pre-drying of the particles and the hot gas partial stream are a pre-dryer supplied, the pre-dried particles are removed from the pre-dryer in a pre-drying exhaust gas stream and then separated from the pre-drying exhaust gas stream, the residues remaining in the pre-drying exhaust gas stream are separated therefrom and the cleaned pre-drying exhaust gas stream is mixed with the hot gas partial stream ,
  • the residues separated from the predrying exhaust gas stream which in particular comprise cellulose, lignin, and various resins and acids, are only present in small quantities, the odor emission of the organic carbon compounds, for example, being minimized or completely eliminated.
  • Figure 2 is a schematic representation of a second embodiment of a drying device designed according to the invention.
  • the drying system shown in FIG. 1 is subdivided into a pre-dryer unit 1 shown in the upper area of FIG. 1 and a main dryer unit 2 shown in the lower area of FIG.
  • the main dryer unit 2 comprises a combustion chamber 3, which is connected via a hot gas pipeline 4 comprising a section 4 ′ on the combustion chamber side and a section 4 ′′ on the dryer side to the inlet-side area of a dryer 5 designed as a dryer drum.
  • the combustion chamber-side section 4 ′ of the hot gas pipeline 4 is connected to a first inlet 6 of a mixing chamber 7, while the dryer-side section 4 ′′ of the hot gas pipeline 4 connects an outlet 8 of the mixing chamber 7 to the dryer 5.
  • the dryer 5 is further provided on the inlet side with a feed unit 9 for supplying pre-dried particles and on the outlet side is connected via an exhaust gas line 10 to a particle separator unit 1 1 designed as a cyclone.
  • the particle separation unit 1 1 has at its lower end a discharge line 12 for the separated dried particles and one a discharge line 13 forming an emergency failure.
  • the outlet 14 of the particle separating unit 11, which carries the exhaust gas stream separated from the particles, is connected to the combustion chamber 3 via a gas line 15, a conveying fan 16 being arranged in the gas line 15.
  • a branch line 17 branches off from the degassing line 15 and is connected to a second inlet 18 of the mixing chamber 7.
  • a further branch line 19 branches off from the combustion chamber-side section 4 ′ of the hot gas pipeline 4, which leads to a first inlet 20 of a further mixing chamber 21 of the pre-dryer unit 1.
  • the further mixing chamber 21 has a second inlet 22, to which a fresh air line 23 is connected.
  • the further mixing chamber 21 is connected via a further hot gas pipeline 24 to the input area of a pre-dryer 25, which is likewise designed as a dryer drum and, similarly to the main dryer 5, is additionally provided on the input side with a feed unit 26 for the particles to be dried.
  • a pre-dryer 25 which is likewise designed as a dryer drum and, similarly to the main dryer 5, is additionally provided on the input side with a feed unit 26 for the particles to be dried.
  • the output of the pre-dryer 25 is in turn connected via an exhaust gas line 27 to a further particle separation unit 28, which is designed as a cyclone analogous to the particle separation unit 11.
  • the discharge line 29 of the further particle separation unit 28, which carries the separated particles, is connected to the feed unit 9 of the main dryer 5 via a transport line 30.
  • the outlet 31 of the further particle separation unit 28, which carries the separated exhaust gas flow is connected via a gas recirculation line 32 and via a conveying fan 33 provided in the gas recirculation line to a pollutant separation unit 34, which in the present exemplary embodiment is designed as a vortex tube.
  • the outlet 35 of the pollutant separation unit 34, which discharges the exhaust gases separated from the pollutants is connected to an exhaust gas line 36, while the outlet 37 of the pollutant separation unit 34, which discharges the separated pollutants, is connected via a return line 38 to a third inlet 39 of the further mixing chamber 21.
  • the particles to be dried are fed via the feed unit 26 to the pre-dryer 25 together with a hot gas stream flowing through the further hot gas pipeline 24.
  • This hot gas stream has a temperature of, for example, 300 to 350 ° C.
  • the particles come into contact with the hot gas stream for a direct, short pre-drying, the pollutants present in the particles being released by the heating.
  • the particles are fed together with the released pollutants and the cooled gas via the exhaust line 27 to the particle separation unit 28, from which the separated particles are transported via the discharge line 29 and the transport line 30 to the feed unit 9 of the main dryer unit 2.
  • the particles predried in this way are fed to the main dryer 5 together with a hot gas stream supplied via the hot gas pipeline 4.
  • a direct long-term drying takes place, through which the particles obtain the desired degree of drying.
  • pollutants and odorous substances still contained in the particles are released, which together with the dried particles and the dried gas stream are fed to the particle separation unit 11 via the exhaust line 10.
  • the particles separated in this are fed via the discharge line 12 to the desired production, while the exhaust gas stream contaminated with pollutants, fine dust and odorous substances is conveyed to the combustion chamber 3 by the delivery fan 16 via the gas line 15.
  • the circulating air gases are injected into the hottest zone of the combustion chamber 3, so that the high temperatures in this zone, for example above 800 ° C., completely burn the residues in the circulating air gases.
  • the hot gases generated in the combustion chamber 3 are then fed to the inlet 6 of the mixing chamber 7 via the section 4 ′ of the hot gas pipeline 4 on the combustion chamber side.
  • a partial flow of the circulating air gases is fed via the branch line 17 to the second inlet 18 of the mixing chamber 7, so that in the mixing chamber 7 there is an intimate mixing of the very hot hot gases from the combustion chamber 3 with the branched drying waste gas stream containing minor residues.
  • the mixed gas is at a temperature of, for example, 500 ° C. over the dryer-side section 4 'of the hot gas Pipeline 4 fed to the main dryer 5.
  • the main dryer unit 2 forms a closed circuit so that the pollutants strongly activated by the relatively high temperatures inside the main dryer 5 are not released to the outside.
  • a partial flow of the hot gas flow led through the extremely high temperatures of the combustion chamber 3 in the combustion chamber-side section 4 ′ of the hot gas pipeline 4 is conducted via the further branch line 19 to the first inlet 20 of the further mixing chamber 21 of the predrying unit 1.
  • a partial hot gas stream having 800 ° C. is formed together with a fresh air stream supplied via the fresh air line 23 and the residual gas stream fed via the return line 38, which hot gas mixture is fed to the pre-dryer 25 via the further hot gas pipeline 24.
  • the drying device shown in FIG. 2 differs from the drying device according to FIG. 1 in that the partial stream divided by the gas line 15 is not mixed with the hot gas stream emerging from the combustion chamber 3, but directly as
  • Hot gas partial flow is used for the direct drying of the particles.
  • a branch line 17 ′ is connected to the input 40 of a predrying combustion chamber 41, the high temperatures present in the predrying combustion chamber 41 producing a partial hot gas stream from the partial flow, which is via an outlet 42 of the predrying combustion chamber 41 and a connected branch line 19 'connected to the first input 20 of the others Mixing chamber 21 of the pre-dryer unit 1 is guided.
  • the further branch line 19 shown in FIG. 1 is thus replaced by the further branch line 19 '.
  • the other function of the embodiment according to FIG. 2 corresponds entirely to that according to FIG. 1.
  • a hot gas mixture is formed in the further mixing chamber 21, together with the residual gas stream led via the return line 28 and a fresh air stream supplied via an optional fresh air line 23, due to the very hot partial hot gas stream emerging from the predrying combustion chamber 41, for example at more than 800 ° C. , which is fed to the pre-dryer 25 via the further hot gas pipeline 24.
  • the main dryer unit which operates with relatively high temperatures and relatively long dwell times, is practically emission-free, the branching within the gas line 15 keeping the mass balance to be observed technologically in the circuit.
  • the pre-dryer unit which is connected to the main dryer unit and operates with relatively short residence times, achieves a high level of economy of a system designed according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un procédé pour le séchage direct de particules, telles que des copeaux de bois, des fibres de bois ou des particules similaires. Selon ce procédé, des gaz chauds sont générés dans une chambre de combustion (3) et sont amenés à un séchoir (5) sous forme de flux de gaz chauds. Les particules sont également introduites dans le séchoir (5) et y sont séchées par contact direct avec les gaz chauds. Les particules séchées sont évacuées du séchoir (5) dans un flux de gaz brûlés (10), puis sont séparées de ce flux. Le flux de gaz brûlés restant, chargé de poussière fine et de substances odorantes, est au moins partiellement réintroduit dans la chambre de combustion (3). Un flux partiel (17, 17') du flux de gaz brûlés est séparé avant l'introduction du flux de gaz brûlés restant (15) dans la chambre de combustion (3) et est amené au séchoir sans passer par la chambre de combustion (3). L'invention concerne également un dispositif pour l'exécution de ce procédé.
PCT/EP2001/002379 2000-03-08 2001-03-02 Procede et dispositif pour le sechage direct de particules Ceased WO2001067016A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58258/01A AU5825801A (en) 2000-03-08 2001-03-02 Method and device for the direct drying of particles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000111177 DE10011177A1 (de) 2000-03-08 2000-03-08 Verfahren und Vorrichtung zum direkten Trocknen von Teilchen
DE10011177.7 2000-03-08

Publications (1)

Publication Number Publication Date
WO2001067016A1 true WO2001067016A1 (fr) 2001-09-13

Family

ID=7633896

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/002379 Ceased WO2001067016A1 (fr) 2000-03-08 2001-03-02 Procede et dispositif pour le sechage direct de particules

Country Status (3)

Country Link
AU (1) AU5825801A (fr)
DE (1) DE10011177A1 (fr)
WO (1) WO2001067016A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
CN103836891A (zh) * 2014-03-20 2014-06-04 北京中矿环保科技股份有限公司 一种卧式气流干化系统

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI4752U1 (fi) * 2000-08-24 2000-12-18 Pauli Matias Haukka Puutavaran kuivaus- ja lämpökäsittelylaitteisto
FR2902866B1 (fr) 2006-06-22 2008-10-10 Giat Ind Sa Generateur de gaz chaud et installtion de sechage ou deshydratation mettant en oeuvre un tel generateur
EP2230477B1 (fr) * 2009-03-10 2014-12-31 Kronotec AG Installation de séchage de copeaux de bois destinée à sécher des copeaux de bois et procédé correspondant destiné à sécher des copeaux de bois
CN107421272A (zh) * 2017-07-18 2017-12-01 池州市中翔光电科技有限公司 一种太阳能产品生产加工制备系统
CN111692862B (zh) * 2020-06-08 2021-11-02 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) 一种光叶苕子加工饲草的节能型干制设备
DE102022132528A1 (de) * 2022-12-07 2024-06-13 Dürr Systems Ag Vorrichtung und Verfahren zur Behandlung von Prozessgas

Citations (9)

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DE1198741B (de) * 1959-09-10 1965-08-12 Nordischer Maschinenbau Trocknungsverfahren und Vorrichtung fuer vegetabilisches und tierisches Gut
US3837272A (en) * 1973-06-14 1974-09-24 Star Kist Foods Meal drying pollution control apparatus
DE2461415A1 (de) 1974-12-24 1976-07-08 Hans Roos Bruedenrueckfuehrungs- und verbrennungsanlage
DE3842479A1 (de) * 1988-12-16 1990-06-21 Baehre & Greten Verfahren und anlage zur rueckgewinnung der in trocknungsabgasen eines holzspaene- oder dergleichen trockners enthaltenen waermeenergie
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
DE4023518A1 (de) * 1990-07-24 1992-03-05 Fritz Egger Gmbh Verfahren und anlage zum trocknen von feuchtem gut
US5263266A (en) * 1988-05-10 1993-11-23 M. Kaindl Holzindustrie Low-emission drying of wood chips
US5697167A (en) * 1994-11-24 1997-12-16 W. Kunz Drytec Ag Method for drying a substance, in particular wood shavings
US5983521A (en) * 1997-10-10 1999-11-16 Beloit Technologies, Inc. Process for splitting recycled combustion gases in a drying system

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DE2852164C2 (de) * 1978-12-02 1985-06-20 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und Vorrichtung zum Betrieb eines Heißgaserzeugers innerhalb einer Mahltrocknungsanlage
DE3336790A1 (de) * 1983-10-10 1985-04-25 Zentralinstitut des Ministeriums für Bezirksgeleitete Industrie und Lebensmittelindustrie, DDR 1195 Berlin Verfahren und vorrichtung zur beheizung von spaenetrocknungsanlagen mit kohlenstaub, insbesondere fuer holzspaene
DE4017806A1 (de) * 1990-06-01 1991-12-05 Koerting Ag Verfahren und anlage zur kontinuierlichen trocknung von holzspaenen, holzfasern oder anderen schuettguetern
DE19654043C2 (de) * 1996-12-23 1998-05-28 Martin Dipl Ing Knabe Trockner mit Abgasreinigung mittels thermischer Nachverbrennung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1198741B (de) * 1959-09-10 1965-08-12 Nordischer Maschinenbau Trocknungsverfahren und Vorrichtung fuer vegetabilisches und tierisches Gut
US3837272A (en) * 1973-06-14 1974-09-24 Star Kist Foods Meal drying pollution control apparatus
DE2461415A1 (de) 1974-12-24 1976-07-08 Hans Roos Bruedenrueckfuehrungs- und verbrennungsanlage
US5263266A (en) * 1988-05-10 1993-11-23 M. Kaindl Holzindustrie Low-emission drying of wood chips
DE3842479A1 (de) * 1988-12-16 1990-06-21 Baehre & Greten Verfahren und anlage zur rueckgewinnung der in trocknungsabgasen eines holzspaene- oder dergleichen trockners enthaltenen waermeenergie
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
DE4023518A1 (de) * 1990-07-24 1992-03-05 Fritz Egger Gmbh Verfahren und anlage zum trocknen von feuchtem gut
US5697167A (en) * 1994-11-24 1997-12-16 W. Kunz Drytec Ag Method for drying a substance, in particular wood shavings
US5983521A (en) * 1997-10-10 1999-11-16 Beloit Technologies, Inc. Process for splitting recycled combustion gases in a drying system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (fr) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Séchoir centrifuge pneumatique
DE10221367B4 (de) * 2002-05-13 2006-05-11 Bankwitz, Robert, Dr. Pneumatischer Schleudertrockner
CN103836891A (zh) * 2014-03-20 2014-06-04 北京中矿环保科技股份有限公司 一种卧式气流干化系统
CN103836891B (zh) * 2014-03-20 2016-01-06 北京中矿环保科技股份有限公司 一种用于各种水分含量煤泥的卧式气流干化系统

Also Published As

Publication number Publication date
DE10011177A1 (de) 2001-09-20
AU5825801A (en) 2001-09-17

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