[go: up one dir, main page]

WO2001059381A1 - Chauffage a gaz combustible de sechoir a tablier pour copeaux de bois - Google Patents

Chauffage a gaz combustible de sechoir a tablier pour copeaux de bois Download PDF

Info

Publication number
WO2001059381A1
WO2001059381A1 PCT/SE2001/000005 SE0100005W WO0159381A1 WO 2001059381 A1 WO2001059381 A1 WO 2001059381A1 SE 0100005 W SE0100005 W SE 0100005W WO 0159381 A1 WO0159381 A1 WO 0159381A1
Authority
WO
WIPO (PCT)
Prior art keywords
flue gas
exhaust gas
gas stream
drying
lignocellulosic material
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/SE2001/000005
Other languages
English (en)
Inventor
Stefan Mikaelsson
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.)
Valmet AB
Original Assignee
Valmet Fibertech AB
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 Fibertech AB filed Critical Valmet Fibertech AB
Priority to AU2001227201A priority Critical patent/AU2001227201A1/en
Publication of WO2001059381A1 publication Critical patent/WO2001059381A1/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • 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
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the present invention relates to methods for drying lignocellulosic material. More particularly, the present invention relates to methods for drying lignocellulosic material utilizing a hot flue gas from a combustion chamber as an energy source for such drying process. Still more particularly, the present invention relates to apparatus for drying lignocellulosic material.
  • OSB oriented strand board
  • This OSB product can be manufactured from flakes created from logs and which are then subjected to forces to break the flakes into strands having a length parallel to wood grain several times the width of the strand. These strands can then be oriented on the board-forming apparatus .
  • VOC formaldehyde and other volatile hydrocarbons
  • a process for manufacturing board products for lignocellulosic material which includes drying in a pair of dryer stages in which part of the exhaust air produced in the second drying step is used as a source of drying air for the first drying step, and the exhaust air from the first drying step is used as a source of drying air for the first step and as a source of combustion air in a furnace .
  • the fiber dryer prefferably be heated directly from hot flue gas from the burner in the dryer or from a common heat energy plant.
  • the exhaust air from the drying step also contains fly ash from the flue gases.
  • FIG. 1 hereof A known system employing hot flue gas as an energy source and also recycling the exhaust stream containing most of the VOC compounds for combustion is set forth in FIG. 1 hereof.
  • the hot flue gas from combustion chamber 1 passes through line 13 and eventually through fan 14 to stack 12.
  • the hot flue gas is contacted with heater/boiler 3 , in which the heat from the hot flue gas is used to create steam, heated oil, heated water, or other heating medium, which passes through line 15 with pump 16 therein.
  • This heating medium is then used to heat cold air in heat exchanger 4.
  • the cold air enters through line 17 and blower 18, and is then . Jtieated by indirect contact with the heated medium from line 14 in the heat exchanger 4.
  • the cooler heating medium then returns to heater/boiler 3 through line 20.
  • the now heated air stream from line 17 then passes through line 6 as dryer inlet air.
  • the dryer inlet air from line 6 contacts the wood strands for drying same.
  • the exhaust air from the dryer then exits dryer 5 through line 7.
  • a portion of the exhaust air from the dryer can also be recirculated through line 8 to be used as combustion air in the combustion chamber 1 after passing through combustion air fan 2.
  • the dryer exhaust air in line 8 can be passed into various sections of combustion chamber 1 as desired.
  • the lignocellulosic material comprises wood strands.
  • the wood strands are used to produce oriented strand board (OSB) .
  • the hot flue gas is provided at a temperature of greater than about 800°C.
  • the cooling of the hot flue gas provides a partially cooled flue gas at a temperature of less than about
  • the drying of the lignocellulosic material with the cooled flue gas stream provides the exhaust gas stream comprising a plurality of the exhaust gas streams.
  • the method includes transporting the lignocellulosic material on a conveyor from a first end to a second end, wherein the plurality of exhaust gas streams comprises a first exhaust gas stream proximate to the first end of the conveyor and a second exhaust gas stream proximate to the second end of the conveyor.
  • the recirculating of the at least a portion of the exhaust gas stream to the combustion chamber comprises recirculating the first exhaust gas stream and the recirculating of the at least another portion of the exhaust gas stream comprises recirculating the second exhaust gas stream.
  • the second exhaust gas stream comprises a plurality of second exhaust gas streams.
  • apparatus for drying lignocellulosic material comprising a combustion chamber providing a hot flue gas, a first mixing chamber for cooling the hot flue gas by contact with a first cooling gas to provide a partially cooled flue gas, a second mixing chamber for cooling the partially cooled flue gas by contact with cold air to provide a cooled flue gas stream, a dryer for drying the lignocellulosic material by contact with the cooled flue gas stream to provide an exhaust gas stream, first recirculation means for recirculating at least a portion of the cooled flue gas stream to the combustion chamber, and second recirculation means for recirculating at least another portion of the cooled flue gas stream as the first cooling gas.
  • the dryer for drying the lignocellulosic material provides a plurality of the exhaust gas streams.
  • the dryer comprises a conveyor including a first end and a second end, and wherein the plurality of exhaust gas streams comprises a first exhaust gas stream proximate to the first end of the conveyor and a second exhaust gas stream proximate to the second end of the conveyor.
  • the first recirculation means recirculates the first exhaust gas stream and the second recirculation means recirculates the second exhaust gas stream.
  • the second exhaust gas stream comprises a plurality of second exhaust gas streams.
  • FIG. 1 is a schematic representation of a system for drying lignocellulosic material in accordance with the prior art
  • FIG. 2 is a schematic representation of a system for drying lignocellulosic material in accordance with the present invention.
  • FIG. 3 is a partial schematic representation of a portion of a preferred embodiment of the method for drying lignocellulosic material shown in FIG. 2.
  • FIG. 2 in which like reference numerals refer to like elements of those shown in FIG. 1, the Figure shows schematically the flow of drying air and exhaust air to and from the dryer for wood strands in accordance with this invention.
  • Hot flue gas is provided from combustion chamber 1 through exit line 20 therefrom. This hot flue gas is used to provide a major portion of the medium for direct drying of the lignocellulosic material or wood fiber in the dryer 5. The remainder of the air required for drying purposes is supplied in the form of fresh air 17 from the atmosphere.
  • the hot flue gas from the combustion chamber 1 exiting through line 20 passes into the mixing chamber 11.
  • hot flue gas at temperatures of greater than about 800 °C is cooled down to about 400°C or less by contact with an air inlet recirculation stream 10, which is discussed in more detail below. Due to its cooling as described herein, the now partially cooled flue gas can then be transported and cleaned in normal mild steel ductwork and the like. In any event, the partially cooled flue gas stream then passes through fan 22 into a second mixing chamber 9.
  • This drying mixing chamber is a chamber in which the partially cooled flue gas from line 20 is then contacted with cool or cold air from line 17 to provide flue gas at a suitable temperature for the dryer 5.
  • the cooled flue gas stream then passes through line 23 and fan 24, and enters dryer 5 through dryer inlet air stream 6.
  • dryer exhaust air exits the dryer 5 through line 7.
  • This dryer exhaust air includes the volatile organic compounds (VOC) , and at least a portion of same can thus be recirculated back to the combustion system to be used as combustion air in combustion chamber 1 in which the VOC would then be combusted. This occurs through recirculation through line 8 with the aid of fan 2.
  • VOC volatile organic compounds
  • the dryer 5 is divided into three sections, 5a, 5b and 5c.
  • This exhaust gas, having less VOC, passes through line 30 into particulate cleaning apparatus 32 (known in the art) for transfer therefrom through line 34.
  • This supply of cleaned exhaust dryer gas can be vented, or used in another portion of the plant, or also returned to the combustion chamber 1 along with the more impure dryer exhaust gas from line 26.
  • mixing chambers 9 and 11 for the various air and gaseous streams are provided instead of heat exchangers, therefore demonstrating a substantial cost reduction in that manner alone.
  • no corresponding heating medium such as hot oil, steam or hot water, and boilers for these products, are required to produce the heating medium itself at a further substantial reduction in cost.
  • combustion chamber 1 itself, this is generally conventional. It includes an inlet for fuel, which can be biofuel in the form of bark, wood waste, or the like, which is generated during manufacture of the board material itself. Sanding dust can also be supplied through a separate inlet into the burner. It is also possible to use oil or gas as additional fuel. As is noted above, however, the air required for combustion is supplied in the embodiment shown in FIG. 2 through line 8 and various lines attached thereto.
  • fuel can be biofuel in the form of bark, wood waste, or the like, which is generated during manufacture of the board material itself.
  • Sanding dust can also be supplied through a separate inlet into the burner. It is also possible to use oil or gas as additional fuel.
  • the air required for combustion is supplied in the embodiment shown in FIG. 2 through line 8 and various lines attached thereto.
  • the actual combustion temperature in the combustion chamber 1 is selected so that the main portion of the volatile organic substances in the exhaust air is combusted, and this is normally at about 850°C, but generally greater than 800°C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

La présente invention concerne des procédés de séchage de matières lignocellulosiques consistant d'abord à fournir un gaz combustible chaud d'une chambre de combustion, à refroidir ce gaz combustible chaud, à mélanger ensuite le gaz combustible partiellement refroidi avec de l'air froid, à sécher les matières lignocellulosiques avec le gaz combustible ainsi refroidi pour obtenir un gaz de combustion, à recirculer une partie du courant de gaz de combustion vers la chambre de combustion, et enfin, à recirculer une autre partie du gaz de combustion pour refroidir le gaz combustible chaud.
PCT/SE2001/000005 2000-02-11 2001-01-04 Chauffage a gaz combustible de sechoir a tablier pour copeaux de bois Ceased WO2001059381A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001227201A AU2001227201A1 (en) 2000-02-11 2001-01-04 Flue gas heating of conveyor dryer for wood strands

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US50300300A 2000-02-11 2000-02-11
US09/503,003 2000-02-11

Publications (1)

Publication Number Publication Date
WO2001059381A1 true WO2001059381A1 (fr) 2001-08-16

Family

ID=24000352

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/000005 Ceased WO2001059381A1 (fr) 2000-02-11 2001-01-04 Chauffage a gaz combustible de sechoir a tablier pour copeaux de bois

Country Status (2)

Country Link
AU (1) AU2001227201A1 (fr)
WO (1) WO2001059381A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010102736A1 (fr) 2009-03-10 2010-09-16 Kronotec Ag Installation destinée à sécher des copeaux de bois et procédé associé pour sécher des copeaux de bois
WO2013043915A1 (fr) * 2011-09-21 2013-03-28 Chevron U.S.A. Inc. Système de pyrolyse utilisant, à des fins de séchage, des gaz de fumée refroidis
US8997924B2 (en) 2007-03-21 2015-04-07 Ashtech Industries, Llc Utility materials incorporating a microparticle matrix
US9076428B2 (en) 2007-03-21 2015-07-07 Ashtech Industries, Llc Sound attenuation building material and system
EP4567362A1 (fr) 2023-12-08 2025-06-11 SWISS KRONO Tec AG Technique de réduction de polluants dans des installations de séchage de bords de rive osb
EP4567361A1 (fr) 2023-12-08 2025-06-11 SWISS KRONO Tec AG Technique de réduction de polluants dans des installations de séchage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8997924B2 (en) 2007-03-21 2015-04-07 Ashtech Industries, Llc Utility materials incorporating a microparticle matrix
US9076428B2 (en) 2007-03-21 2015-07-07 Ashtech Industries, Llc Sound attenuation building material and system
US8832959B2 (en) 2009-03-10 2014-09-16 Kronotec Ag Wood chip drying system for drying wood chip and associated method for drying wood chip
CN102348949A (zh) * 2009-03-10 2012-02-08 克罗诺泰克股份公司 用于干燥木屑的木屑干燥系统以及相应的木屑干燥方法
CN102348949B (zh) * 2009-03-10 2014-04-02 克罗诺泰克股份公司 用于干燥木屑的木屑干燥系统以及相应的木屑干燥方法
WO2010102736A1 (fr) 2009-03-10 2010-09-16 Kronotec Ag Installation destinée à sécher des copeaux de bois et procédé associé pour sécher des copeaux de bois
US20110305897A1 (en) * 2009-03-10 2011-12-15 Kronotec Ag Wood chip drying system for drying wood chip and associated method for drying wood chip
EP2230477A1 (fr) 2009-03-10 2010-09-22 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
WO2013043915A1 (fr) * 2011-09-21 2013-03-28 Chevron U.S.A. Inc. Système de pyrolyse utilisant, à des fins de séchage, des gaz de fumée refroidis
EP4567362A1 (fr) 2023-12-08 2025-06-11 SWISS KRONO Tec AG Technique de réduction de polluants dans des installations de séchage de bords de rive osb
EP4567361A1 (fr) 2023-12-08 2025-06-11 SWISS KRONO Tec AG Technique de réduction de polluants dans des installations de séchage
WO2025119531A1 (fr) 2023-12-08 2025-06-12 SWISS KRONO Tec AG Procédé de réduction de contaminants dans des systèmes de séchage
WO2025119530A1 (fr) 2023-12-08 2025-06-12 SWISS KRONO Tec AG Procédé de réduction de contaminants dans des systèmes de séchage pour des brins d'osb

Also Published As

Publication number Publication date
AU2001227201A1 (en) 2001-08-20

Similar Documents

Publication Publication Date Title
JP5734879B2 (ja) 木材チップを乾燥させるための木材チップ乾燥プラントおよび木材チップを乾燥させるための対応の方法
US7654011B2 (en) Two-stage thermal oxidation of dryer offgas
CN101379167A (zh) 处理生物质的方法和装置
US11543124B2 (en) Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a hot gas cyclone
US11248845B2 (en) Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
CN110382959A (zh) 用于连续干燥散装物品、特别是木屑和/或木纤维的包括固体燃烧热气发生器的设备和方法
US6588349B1 (en) System for the drying of damp biomass based fuel
WO2001059381A1 (fr) Chauffage a gaz combustible de sechoir a tablier pour copeaux de bois
US11079106B2 (en) 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
CA3063517C (fr) Appareil et procede de sechage continu de produits en vrac
US6138381A (en) Treatment of moist fuel
US5989465A (en) Method of manufacturing a board
US6807749B2 (en) Drying carbon black pellets
US6820350B1 (en) Method of drying lignocellulose material
US5295310A (en) Method for drying a particulate material
CN2348342Y (zh) 底风机型炉气间接加热木材干燥窑
Granstrand et al. Increased production capacity with new drying system
RU2167512C1 (ru) Установка для отопления теплицы
Dzida Small wood waste fired combined heat and power plant. Possible use of wood biomass for the generation of electric and heat energy as an alternative to fossil fuels
WO2010110702A1 (fr) Système et procédé de séchage

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP