EP0459603B1 - Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac - Google Patents

Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac 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
combustion chamber
dryer
flue gases
heat exchanger
vapour
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)
English (en)
Other versions
EP0459603A1 (fr
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 Baehre and Greten GmbH and Co KG
Koerting Hannover GmbH
Original Assignee
Bison Werke Baehre and Greten GmbH and Co KG
Koerting Hannover 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
Family has litigation
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.
Application filed by Bison Werke Baehre and Greten GmbH and Co KG, Koerting Hannover GmbH filed Critical Bison Werke Baehre and Greten GmbH and Co KG
Priority to AT91250134T priority Critical patent/ATE97225T1/de
Publication of EP0459603A1 publication Critical patent/EP0459603A1/fr
Application granted granted Critical
Publication of EP0459603B1 publication Critical patent/EP0459603B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • 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 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.
  • 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.
  • 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.
  • 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.
  • this object is achieved by a method according to the teaching of claim 1 and by a system according to claim 9.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a pipeline 6 branches off in the flow direction upstream of the heat exchanger 7 to the combustion chamber 1.
  • the flue gases generated in the combustion chamber 1 are fed to the heat exchanger 7.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

Landscapes

  • 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)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Radio Relay Systems (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Treatment Of Sludge (AREA)

Claims (12)

  1. Procédé de séchage en continu de copeaux ou de fibres de bois, dans lequel la chaleur de gaz de fumée produits dans une chambre de combustion individuelle est utilisée dans un séchoir alimenté en matériau à sécher, caractérisé en ce que les vapeurs chaudes quittant le séchoir sont ramenées au séchoir dans un circuit sans gaz de fumée et, en amont du séchoir seulement par un échangeur thermique, réchauffées à la température nécessaire au séchage du matériau à sécher par les gaz de fumée quittant la chambre de combustion, un courant partiel de vapeurs chaudes étant dérivé de ce circuit, en amont du réchauffement indirect, et ramené à la chambre de combustion.
  2. Procédé suivant revendication 1, caractérisé en ce qu'un autre courant partiel de vapeurs chaudes est dérivé du circuit, en aval du réchauffement indirect de celui-ci.
  3. Procédé suivant une des revendications précédentes, caractérisé en ce que le courant de vapeurs chaudes qui parcourt le circuit est plus grand que le ou les courants partiels de vapeurs chaudes dérivés.
  4. Procédé suivant une des revendications précédentes, caractérisé en ce que l'ensemble de la combustion a lieu au voisinage de la stoechiométrie.
  5. Procédé suivant une des revendications précédentes, caractérisé en ce qu'on utilise comme combustible primaire, de l'huile, de préférence de l'huile légère, du gaz ou des poussières combustibles, soit individuellement, soit en un mélange quelconque, pour la production des gaz de fumée.
  6. Procédé suivant une des revendications précédentes, caractérisé en ce que les gaz de fumée refroidis produits en aval du réchauffement indirect sont épurés par le procédé du filtre sec.
  7. Procédé suivant une des revendications précédentes, caractérisé en ce qu'on utilise la chaleur résiduelle des gaz de fumée pour préchauffer l'air de combustion envoyé à un brûleur associé à la chambre de combustion pour la production des gaz de fumée.
  8. Procédé suivant une des revendications précédentes, caractérisé en ce que les vapeurs chaudes parcourant le circuit sont réchauffées, en service de séchage pauvre en air de fuite, à une températures comprise entre 400° C et 600°C.
  9. Installation de mise en oeuvre du procédé selon une ou plusieurs des revendications précédentes, avec une chambre de combustion individuelle pour produire la chaleur de séchage pour un séchoir, avec un dispositif pour alimenter le séchoir en matériau à sécher, avec des moyens de transport pour évacuer le matériau séché et les vapeurs chaudes du séchoir et avec un ou plusieurs cyclones pour séparer le matériau séché des vapeurs chaudes, caractérisée en ce qu'une conduite tubulaire (13) pour les vapeurs chaudes, séparées des gaz de fumée, retourne du ou des cyclones 12 au séchoir (8), qu'un échangeur thermique (7) est disposé dans la conduite tubulaire (13) pour le réchauffement indirect des vapeurs chaudes par les gaz de fumée sortant de la chambre de combustion (1) et qu'est prévue une conduite de dérivation (6) de la conduite tubulaire (13) allant à lachambre de combustion (1) dans la direction du courant, en amont de l'échangeur thermique.
  10. Installation suivant la revendication 9, caractérisée en ce qu'un ventilateur (15) est prévu pour évacuer, par un dispositif de filtration (16), les gaz de fumée sortant de l'échangeur thermique (7) vers la cheminée (18).
  11. Installation suivant la revendication 9, caractérisée en ce que le dispositif de filtration (16) est un filtre sec sous la forme d'un filtre à manche ou d'un filtre similaire.
  12. Installation suivant la revendication 11, caractérisée en ce qu'est disposé, en aval du dispositif de filtration (16), un échangeur thermique (17) dans lequel la chaleur résiduelle des gaz de fumée est utilisée pour préchauffer de l'air de combustion qui arrive au brûleur (1) par une conduite tubulaire (19).
EP91250134A 1990-06-01 1991-05-15 Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac Revoked EP0459603B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91250134T ATE97225T1 (de) 1990-06-01 1991-05-15 Verfahren und anlage zur kontinuierlichen trocknung von holzspaenen, holzfasern oder anderen schuettguetern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4017806A DE4017806A1 (de) 1990-06-01 1990-06-01 Verfahren und anlage zur kontinuierlichen trocknung von holzspaenen, holzfasern oder anderen schuettguetern
DE4017806 1990-06-01

Publications (2)

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

Family

ID=6407697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250134A Revoked EP0459603B1 (fr) 1990-06-01 1991-05-15 Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac

Country Status (12)

Country Link
US (1) US5237757A (fr)
EP (1) EP0459603B1 (fr)
JP (1) JPH04227464A (fr)
AT (1) ATE97225T1 (fr)
AU (1) AU7806091A (fr)
CA (1) CA2043681A1 (fr)
CZ (1) CZ280448B6 (fr)
DE (2) DE4017806A1 (fr)
ES (1) ES2046848T3 (fr)
FI (1) FI912615A (fr)
RU (1) RU2023964C1 (fr)
ZA (1) ZA914130B (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
EP3759056A4 (fr) * 2018-03-01 2022-05-11 Steve Macchio Systèmes et procédés de séchage thermique respectueux de l'environnement

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FR2654811B1 (fr) * 1989-11-20 1994-11-04 Kurt Gisiger Procede et installation pour secher des matieres organiques, notamment des particules de bois.
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DE59501167D1 (de) 1994-11-24 1998-02-05 Kunz Drytec Ag W Verfahren zum Trocknen einer Substanz, insbesondere von Holzspänen
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DE10056459C1 (de) * 2000-11-14 2002-04-04 Fraunhofer Ges Forschung Verfahren zum Aufbereiten faseriger Substanzen
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DE10157596C1 (de) * 2001-11-23 2003-03-20 Fraunhofer Ges Forschung Verfahren zum Aufbereiten faseriger Substanzen
EP1843114A1 (fr) * 2006-04-06 2007-10-10 Swedish Exergy Consulting AB Installation de séchage
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
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RU2446371C2 (ru) * 2010-06-09 2012-03-27 Научно-производственная фирма с ограниченной ответственностью "Экополимер" Устройство для сушки осадка, активного ила или отстоя промышленных и бытовых сточных вод
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CN101915497B (zh) * 2010-08-13 2012-07-04 李相荣 用废热汽体制备过热蒸汽的褐煤干燥提质工艺
RU2467269C1 (ru) * 2011-05-20 2012-11-20 Федеральное государственное образовательное учреждение высшего профессионального образования "Красноярский государственный аграрный университет" Автономное устройство для сушки высоковлажного растительного сырья
WO2014057348A2 (fr) * 2012-10-14 2014-04-17 Applied Cleantech Inc. Systèmes et dispositifs pour production de charge d'alimentation à partir d'eaux usées
CN103148690B (zh) * 2013-04-07 2015-01-21 江苏快乐木业集团有限公司 一种刨花干燥设备
CN103722754B (zh) * 2013-12-19 2016-05-04 中材科技股份有限公司 一种适用于中空复合材料生产线的固化装置
US11079106B2 (en) 2017-03-03 2021-08-03 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising multi-fuel burner with a muffle cooling system
US11499778B2 (en) 2017-03-03 2022-11-15 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a solid fired hot gas generator
CN110382961A (zh) * 2017-03-03 2019-10-25 道格拉斯科技有限公司 用于连续干燥散装物品、特别是木屑和/或木纤维的包括热气旋风分离器的设备和方法
US11248845B2 (en) 2017-03-03 2022-02-15 Douglas Technical Limited Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
UA125909C2 (uk) 2017-06-06 2022-07-06 Даґлас Текнікал Лімітед Установка і спосіб безперервного сушіння насипних матеріалів

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Cited By (3)

* 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
EP3759056A4 (fr) * 2018-03-01 2022-05-11 Steve Macchio Systèmes et procédés de séchage thermique respectueux de l'environnement

Also Published As

Publication number Publication date
ZA914130B (en) 1992-03-25
JPH04227464A (ja) 1992-08-17
RU2023964C1 (ru) 1994-11-30
ES2046848T3 (es) 1994-02-01
ATE97225T1 (de) 1993-11-15
CA2043681A1 (fr) 1991-12-02
FI912615A0 (fi) 1991-05-31
DE4017806A1 (de) 1991-12-05
DE59100574D1 (de) 1993-12-16
AU7806091A (en) 1991-12-05
CZ280448B6 (cs) 1996-01-17
EP0459603A1 (fr) 1991-12-04
US5237757A (en) 1993-08-24
FI912615A (fi) 1991-12-02
CS163591A3 (en) 1992-02-19

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