EP0459603B1 - Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials - Google Patents

Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials Download PDF

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Publication number
EP0459603B1
EP0459603B1 EP91250134A EP91250134A EP0459603B1 EP 0459603 B1 EP0459603 B1 EP 0459603B1 EP 91250134 A EP91250134 A EP 91250134A EP 91250134 A EP91250134 A EP 91250134A EP 0459603 B1 EP0459603 B1 EP 0459603B1
Authority
EP
European Patent Office
Prior art keywords
characterised
dryer
combustion chamber
vapour
flue gases
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.)
Revoked
Application number
EP91250134A
Other languages
German (de)
French (fr)
Other versions
EP0459603A1 (en
Inventor
Uwe Dr. Wiedmann
Peter Dr. Puppich
Herbert Dipl.-Ing. Krichel
Holger Dipl.-Ing. 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.)
Bison-Werke Bahre & Greten & Co KG GmbH
Korting Hannover AG
Original Assignee
Bison-Werke Bahre & Greten & Co KG GmbH
Korting Hannover 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
Family has litigation
Priority to DE4017806A priority Critical patent/DE4017806A1/en
Priority to DE4017806 priority
Application filed by Bison-Werke Bahre & Greten & Co KG GmbH, Korting Hannover AG filed Critical Bison-Werke Bahre & Greten & Co KG GmbH
Publication of EP0459603A1 publication Critical patent/EP0459603A1/en
Application granted granted Critical
Publication of EP0459603B1 publication Critical patent/EP0459603B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6407697&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0459603(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00Heating arrangements
    • F26B23/02Heating arrangements using combustion heating
    • F26B23/022Heating 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/24Wood particles, e.g. shavings, cuttings, saw dust

Description

  • The invention relates to a method and a plant for the continuous drying of wood chips, wood fibers or other bulk materials, in which the heat of flue gases generated in a combustion chamber is used in a dryer charged with the material to be dried.
  • It is customary to introduce the flue gases directly into the dryer.
  • When wood shavings, wood fibers or other bulk materials are dried, organic pollutants are released which, in addition to the fine dust contained in the flue gases and vapors, are a burden on the environment. The exhaust gases leaving the dryer must therefore be cleaned before being discharged into the atmosphere. This is done by dedusting and, if necessary, by further, subsequent cleaning processes such as wet dedusting, electrostatic filters, cloth filters, gravel bed filters, chip bed filters and thermal afterburning. With such cleaning processes, the emissions can be reduced, but this requires high investment and operating costs.
  • DE-A-24 61 415 discloses a drying system with a dryer heated directly by flue gases, the flue gases being generated in a combustion chamber upstream of the dryer. The mixture of flue gases and vapors leaving the dryer, which is contaminated with pollutants, is cleaned by means of cyclone dusting and then divided into two partial flows. One part of the stream is returned to the combustion chamber and injected into the hottest zone for the combustion of the pollutants, so that there is intensive mixing with the flue gases, which are then fed back to the dryer. The other partial flow is released into the atmosphere via an exhaust pipe.
  • This method has the advantage of a reduced amount of exhaust gas, which means that fewer pollutants leave the system, but, with due regard to the legal regulations on emission limitation, it also does not manage without the additional cleaning methods described above.
  • From DE-A-23 60 467 a method and a device for drying solids contained in liquid with two independent combustion chambers is known. Part of the vapors is fed to the main combustion chamber, from which the combustion gases are led into the atmosphere. The auxiliary combustion chamber, which contains its own burner, is supplied with a portion of the vapors after preheating by the exhaust gases from the first combustion chamber in a heat exchanger, the combustion gases being introduced from the auxiliary combustion chamber into the dryer charged with the material to be dried. Here too, oxygen-containing combustion gases are used for drying, so that there is an increased risk of explosion when drying wood chips or wood fibers.
  • The object of the invention is to provide a method and a system of the type mentioned, whereby pollutant emission limit values can be maintained with less effort than previously, which are smaller than previously prescribed, and which increases the efficiency and at the same time the Risk of explosion is reduced.
  • According to the invention, this object is achieved by a method according to the teaching of claim 1 and by a system according to claim 9.
  • Accordingly, the vapors, which are polluted with pollutants but are free of flue gas, are returned to the dryer in the circuit and used as a drying agent for direct heating of the dryer. The heat content required for this is obtained by indirect heating before entering the dryer. It is heated with smoke gases that are generated in a combustion chamber.
  • At the same time, this combustion chamber is the 'lock' for a vapor partial flow which has to be removed from the circuit due to the mass balance to be maintained, i.e. pollutants can only leave the circuit via the combustion chamber. There they are burned and in this way provide part of the energy required to heat the circuit.
  • With this solution, it is possible to keep the emissions of solid, gaseous and / or condensed organic pollutants below the limit values of the statutory regulations without the additional cleaning processes otherwise required. The additional investment costs for the indirect heating of the circuit can be amortized at short notice due to the unprecedented overall cleaning effect. In addition, these costs are almost offset by savings due to comparatively small system parts such as dryers, separators, fans, filter devices and chimneys. It is particularly advantageous that the circuit in which the vapors move through the dryer is very low in oxygen due to the complete exclusion of flue gases, so that the risk of an explosion is greatly reduced. The low oxygen content in turn enables near-stoichiometric combustion, so that the fuel is used to a high degree and a high degree of efficiency can be achieved.
  • If it is difficult to mix the relatively cool vapor partial flow into the hot combustion chamber, a further vapor partial flow can be generated after the indirect heating of the Circuit branched from this and introduced into the combustion chamber. Since this vapor partial flow is heated, it can be mixed more effectively with the flue gases. In this case, the first vapor partial flow is reduced by the volume of the second vapor partial flow due to the mass balance to be maintained in the circuit.
  • Other advantageous features of the invention emerge from the further subclaims.
  • The invention is explained in more detail below using an exemplary embodiment. The accompanying drawing shows a basic circuit diagram of a system for the continuous drying of wood chips, wood fibers or the like.
  • In this system, a dryer 8, a separator 10, a fan 11, one or more cyclones 12 and a recuperative heat exchanger 7 are connected together in a circuit via pipes. Design measures ensure that the leakage in this circuit is low.
  • The system also has a combustion chamber 1 with a burner 2, which is connected to the heat exchanger 7 on the flue gas side, but is not part of the circuit. Supply lines for air 3, light oil or gas 4 and wood dust 5 lead to burner 2. The fuels can be burned individually or in any mixture.
  • The material to be dried is entered between the heat exchanger 7 and dryer 8 via a material lock, not shown, for example a rotary valve, and a pipeline 9 into the circuit. The material can also be fed directly into the entrance area of the dryer 8, which, as is customary for this application, can be a nozzle tube dryer, single-pass, multi-pass drum dryer or the like.
  • From the pipeline 13 arranged between the cyclone or cyclones 12 and the dryer 8 for returning the vapors to the dryer 8, a pipeline 6 branches off in the flow direction upstream of the heat exchanger 7 to the combustion chamber 1.
  • The system works as follows:
  • The flue gases generated in the combustion chamber 1 are fed to the heat exchanger 7. There is an indirect heat exchange between the hot flue gases and the relatively cool vapors which are circulated, as a result of which the vapors heat up to the process temperature required for drying the material to be dried. After this heat exchange process, the hot vapor stream is fed to the dryer 8 for direct heating via the section of the pipeline 13 arranged between the heat exchanger 7 and the dryer 8. During the drying process, further vapors and harmful ingredients are released from the material to be dried, which are removed from the dryer 8 together with the dried material. The coarser fractions of the dried material are separated in the subsequent separator. The fine fractions of the dried material remaining in the vapors are then fed together with the vapors via a blower 11 to one or more cyclones 12. This is where the fine fractions of the dried material are separated. The vapors leaving the cyclone (s) 12 are contaminated with fine dust and the pollutants formed during drying. They are returned to the dryer 8 via the pipeline 13, passing through the heat exchanger 7 and being heated up. This closes the almost inert vapor cycle.
  • Since new vapors containing pollutants are constantly formed in the circuit during the drying process, the circulating vapor flow must be continuously reduced for reasons of the mass balance to be observed technologically in the circuit. This is done by means of the branch line 6, via which a vapor partial flow passed into the combustion chamber 1 and burned there. In the event that the mixing of the relatively cool vapor partial flow into the hot flue gases of the combustion chamber 1 is not effective, a further branch line 14 can be led into the combustion chamber 1, which branches off from the circuit behind the heat exchanger 7. The heated vapors contained therein are easier to mix with the hot flue gases from the combustion chamber 1. The sum of the two vapor partial streams is always the same because of the mass balance to be maintained in the circuit.
  • The cooled flue gases leaving the heat exchanger 7 are conveyed by means of a fan 15 into a filter device 16, which is designed as a dry filter in the form of a bag filter or the like, where they are cleaned. This filter device can be omitted if ash-free fuel is used. After cleaning, the flue gases are passed into a heat exchanger 17 and used there to preheat the combustion air. This is fed to the burner 2 via the pipeline 19. After the heat exchanger 17, the flue gases are passed into the atmosphere via a chimney 18.
  • The invention is not only limited to the drying of wood chips, wood fibers or the like, but also for other bulk materials, e.g. Fish meal, peat, coal, grain and sewage sludge, applicable.

Claims (12)

  1. A process for continuous drying of wood chips, or wood fibres, from flue gases generated in a separate combustion chamber by means of heat in a dryer loaded with the material to be dried characterised in that residual vapour from the dryer returns to the dryer in a flue gas free cycle, and immediately before the dryer passes over a heat exchanger through which the combustion chamber waste gases are heated to a temperature required for drying of material to be dried, whereby a subsidiary vapour stream is diverted from that cycle before the heat exchanger and is returned to the combustion chamber.
  2. A process according to claim 1, characterised in that a further subsidiary vapour stream is diverted from the cycle following heat exchange.
  3. A process according to one of the preceding claims, characterised in that a greater vapour current is flowing in the cycle than in the subsidiary vapour stream.
  4. A process according to one of the preceding claims, characterised in that the entire combustion is substantially stoichiometric.
  5. A process according to one of the preceding claims, characterised in that the primary combustion material for the generation of the flue gases comprises oil, preferably light oil, gas or combustible powder, either alone or optionally included in a mixture.
  6. A process according to one of the preceding claims, characterised in that after the heat exchange the resulting cooled flue gases are purified in a dry filtration process.
  7. A process according to one of the preceding claims, characterised in that the residual heat of the flue gases is used for preheating a burner of one of the combustion chambers for generation of flue gas combustion air flow.
  8. A process according to one of the preceding claims, characterised in that the vapours flowing in the cycle are heated to drying operation temperature of between 400°C and 600°C.
  9. Apparatus for carrying out a method according to one or more of the preceding claims, with a separate combustion chamber for generation of drying heat for a dryer, a feeding device for the material to be dried in the dryer, conveyor means for transfer of dried material and vapour from the dryer and one or more cyclones for separation of the dried material from the vapour, characterised in that a tubing (13) from the cyclones (12) returns the vapour separated from the flue gas to the dryer (8), a heat exchanger (7) is arranged in the tubing (13) for heat exchange between the combustion chamber waste flue gases and the vapour, and a branch (6) extends from the tubing (13) prior to the heat exchanger (7) in the direction of current flow to the combustion chamber (1).
  10. Apparatus according to claim 9, characterised in that a ventilator (15) is arranged for removal of waste flue gases from the heat exchanger (7) to a chimney (18) above a filter device (16).
  11. Apparatus according to claim 9, characterised in that the filter device (16) is formed as a drying filter in the form of a tube filter or the like.
  12. Apparatus according to claim 11, characterised in that a heat exchanger (17) is adjacent to the filter device (16), by means of which the residual heat of the flue gases is used to heat the combustion atmosphere, which arrives in the burner (2) above a tubing (19).
EP91250134A 1990-06-01 1991-05-15 Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials Revoked EP0459603B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4017806A DE4017806A1 (en) 1990-06-01 1990-06-01 Method and system for the continuous drying of woodchips, wood fibers or other sheet goods
DE4017806 1990-06-01

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT91250134T AT97225T (en) 1990-06-01 1991-05-15 Method and system for the continuous drying of woodchips, wood fibers or other sheet goods.

Publications (2)

Publication Number Publication Date
EP0459603A1 EP0459603A1 (en) 1991-12-04
EP0459603B1 true EP0459603B1 (en) 1993-11-10

Family

ID=6407697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250134A Revoked EP0459603B1 (en) 1990-06-01 1991-05-15 Process and apparatus for continuous drying of wood chips, wood fibres or other bulk materials

Country Status (12)

Country Link
US (1) US5237757A (en)
EP (1) EP0459603B1 (en)
JP (1) JPH04227464A (en)
AT (1) AT97225T (en)
AU (1) AU7806091A (en)
CA (1) CA2043681A1 (en)
CZ (1) CZ280448B6 (en)
DE (1) DE4017806A1 (en)
ES (1) ES2046848T3 (en)
FI (1) FI912615A (en)
RU (1) RU2023964C1 (en)
ZA (1) ZA9104130B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (en) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Pneumatic centrifugal dryer

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FR2654811B1 (en) * 1989-11-20 1994-11-04 Kurt Gisiger Process and plant for drying organic materials, particularly wood particles.
NL9100606A (en) * 1991-04-08 1992-11-02 Vandenbroek Int Bv Drying device.
DE59501167D1 (en) 1994-11-24 1998-02-05 Kunz Drytec Ag W Process for drying a substance, especially wood chips
US5603751A (en) * 1995-06-02 1997-02-18 Mac Equipment, Inc. Method and apparatus for removing particulate material from a wood drying system
CA2154405A1 (en) * 1995-07-21 1997-01-22 Rene Besnard Apparatus for drying crop materials
SE507409C2 (en) * 1995-10-19 1998-05-25 Vattenfall Ab A process for fuel treatment
US5758434A (en) * 1996-11-12 1998-06-02 Georgia-Pacific Corporation Wood drying system
DE19654043C2 (en) 1996-12-23 1998-05-28 Martin Dipl Ing Knabe Dryer with exhaust gas cleaning using thermal post-combustion
US6370797B1 (en) * 1998-06-11 2002-04-16 Universal Dynamics, Inc. Method and apparatus for drying granular solids with venturi powered gas circulation
DE10011177A1 (en) * 2000-03-08 2001-09-20 Valmet Panelboard Gmbh Drying of wood particles as chips or fibers and the like has an initial drying stage partially heated by cleaned exhaust gas from the main drier where hot gases are the drying medium from a combustion chamber
FI4752U1 (en) * 2000-08-24 2000-12-18 Pauli Matias Haukka Timber drying and heat treatment equipment
DE10056459C1 (en) * 2000-11-14 2002-04-04 Fraunhofer Ges Forschung Wood fibre treatment method has closed drying circuit supplied with steam-gas mixture separated from dried wood fibres
WO2002053995A1 (en) * 2001-01-08 2002-07-11 Advanced Dryer Systems, Inc. Drying system with heat pipe heat recovery
DE10157596C1 (en) * 2001-11-23 2003-03-20 Fraunhofer Ges Forschung Fibrous substance preparation process involves diverting part flow into second heat exchanger before first heat exchanger in flow direction
EP1843114A1 (en) * 2006-04-06 2007-10-10 Swedish Exergy Consulting AB Dryer plant
US20080271335A1 (en) * 2007-05-03 2008-11-06 Archer-Daniele-Midland Company System for using heat to process an agricultural product, a fluidized bed combustor system, and methods of employing the same
ES2554638T3 (en) * 2008-01-10 2015-12-22 Douglas Technical Limited Procedure and device for continuous drying of bulk product, in particular of wood fibers and / or wood chips
ES2368960T3 (en) * 2008-12-23 2011-11-24 Kronotec Ag Installation of drying products of wood crushing.
PL2230477T3 (en) * 2009-03-10 2015-05-29 SWISS KRONO Tec AG Wood chips drying plant for drying wood chips and method for drying wood chips
EP2411749A4 (en) * 2009-03-25 2016-01-20 Saxlund Internat Holding Ab System and method for drying
RU2446371C2 (en) * 2010-06-09 2012-03-27 Научно-производственная фирма с ограниченной ответственностью "Экополимер" Device for drying sediments, active sludge or industrial and household sewage sediments
DE102010036425A1 (en) * 2010-07-15 2012-01-19 Polysius Ag Apparatus and method for drying and Torrefizierung of at least one carbonaceous material flow in a multi-deck oven
CN101915497B (en) * 2010-08-13 2012-07-04 李相荣 Lignite-drying and quality-improving process for preparing superheated steam from waste heat steam
RU2467269C1 (en) * 2011-05-20 2012-11-20 Федеральное государственное образовательное учреждение высшего профессионального образования "Красноярский государственный аграрный университет" Independent drying unit of high-moisture plant raw material
US20150267963A1 (en) * 2012-10-14 2015-09-24 Applied Cleantech Inc. Systems and devices for feedstock production from sewage
CN103148690B (en) * 2013-04-07 2015-01-21 江苏快乐木业集团有限公司 Wood shaving drying device
CN103722754B (en) * 2013-12-19 2016-05-04 中材科技股份有限公司 A kind of solidification equipment that is applicable to hollow composite material production line
CN110382961A (en) * 2017-03-03 2019-10-25 道格拉斯科技有限公司 The device and method including hot gas cyclone separator for continuous drying bulk product, particularly sawdust and/or wood-fibred
EP3589890A1 (en) 2017-03-03 2020-01-08 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
CN110382959A (en) * 2017-03-03 2019-10-25 道格拉斯科技有限公司 The device and method including solid combustion hot air generator for continuous drying bulk product, particularly sawdust and/or wood-fibred
EA201991751A1 (en) 2017-03-03 2020-02-28 Дуглас Текникал Лимитед DEVICE AND METHOD FOR CONTINUOUS DRYING OF LOOSE PRODUCTS, IN PARTICULAR WOOD CHIP AND / OR WOOD FIBERS, USING A MULTI-FUEL BURNER WITH A COOLING Muffle SYSTEM

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363097A1 (en) 2002-05-13 2003-11-19 Robert Dr. Bankwitz Pneumatic centrifugal dryer
DE10221367B4 (en) * 2002-05-13 2006-05-11 Bankwitz, Robert, Dr. Pneumatic centrifugal dryer

Also Published As

Publication number Publication date
ZA9104130B (en) 1992-03-25
AU7806091A (en) 1991-12-05
CA2043681A1 (en) 1991-12-02
RU2023964C1 (en) 1994-11-30
CZ280448B6 (en) 1996-01-17
JPH04227464A (en) 1992-08-17
ES2046848T3 (en) 1994-02-01
FI912615A (en) 1991-12-02
EP0459603A1 (en) 1991-12-04
AT97225T (en) 1993-11-15
CS163591A3 (en) 1992-02-19
US5237757A (en) 1993-08-24
FI912615A0 (en) 1991-05-31
DE4017806A1 (en) 1991-12-05
FI912615D0 (en)

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