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EP4458538A1 - Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois - Google Patents

Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois Download PDF

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Publication number
EP4458538A1
EP4458538A1 EP23171473.4A EP23171473A EP4458538A1 EP 4458538 A1 EP4458538 A1 EP 4458538A1 EP 23171473 A EP23171473 A EP 23171473A EP 4458538 A1 EP4458538 A1 EP 4458538A1
Authority
EP
European Patent Office
Prior art keywords
wood
voc
exhaust air
oxidizing agent
concentration
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.)
Pending
Application number
EP23171473.4A
Other languages
German (de)
English (en)
Inventor
Prof. Dr. Joachim Hasch
Dr. Norbert Kalwa
Dr. Julia Borowka
Volker Schwind
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.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec 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 Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to EP23171473.4A priority Critical patent/EP4458538A1/fr
Priority to CN202480029477.4A priority patent/CN121175157A/zh
Priority to PCT/EP2024/059617 priority patent/WO2024227566A1/fr
Publication of EP4458538A1 publication Critical patent/EP4458538A1/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • 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
    • 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
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • 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
    • B27N1/02—Mixing the material with binding agent
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/12—Moulding of mats from fibres
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • 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
    • B27N5/00—Manufacture of non-flat articles

Definitions

  • the invention relates to a process for producing a wood-based material in which exhaust air is produced which contains volatile organic substances, in particular terpenes and/or aldehydes, and which is released into the environment.
  • the invention relates to a wood material manufacturing device for producing a wood material, comprising (a) a shredder for shredding wood and (b) a dryer for drying shredded wood, so that exhaust air is produced which contains volatile organic substances, in particular terpenes and/or aldehydes,
  • Wood materials are made from wood and are used, for example, to make chipboard, OSB boards, wood fiber boards or insulation material.
  • volatile organic substances volatile organic compounds, VOCs
  • VOCs volatile organic compounds
  • the production of this wood material requires large quantities of steam, some of which is diverted and used to heat or cook the wood chips, as can be seen from the US 4,925,527
  • part of the steam is condensed, the terpene-rich components are separated and the heat released during condensation is used to evaporate water. This process is complex and not very energy efficient.
  • the invention is based on the task of reducing VOCs in the exhaust air.
  • the invention solves the problem by a generic method with the step of introducing an oxidizing agent into the exhaust air so that volatile organic substances contained in the exhaust air are oxidized and purified exhaust air is produced.
  • the invention also solves the problem by means of a generic wood material manufacturing device which has an exhaust air purifier which is designed to introduce an oxidizing agent into the exhaust air so that volatile organic substances contained in the exhaust air are oxidized and purified exhaust air is produced.
  • the advantage of the invention is that predetermined limit values for the release of volatile organic substances into the environment can be kept within predetermined limit values with comparatively little technical effort.
  • an exhaust air purifier is understood to mean a device by means of which a VOC concentration, in particular terpenes and/or aldehydes, can be reduced by at least 50%, in particular at least 70%, through chemical reaction of the volatile organic compounds with an oxidizing agent. This is the maximum possible reduction in volatile organic substances.
  • Exhaust air is understood to be a mixture of air, possibly particles, possibly gaseous water and possibly liquid droplets, in particular water droplets.
  • the oxidizing agent is preferably a flameless oxidizing agent.
  • the oxidizing agent contains oxygen. It is advantageous if the oxidizing agent releases elemental oxygen when reacting with terpenes and/or aldehydes.
  • the oxidizing agent is hydrogen peroxide or ozone. When hydrogen peroxide is mentioned, this also includes an aqueous solution of hydrogen peroxide.
  • the hydrogen peroxide may contain a Fe(II) salt, ammonium persulfate, cytochrome P450, monooxygenases or ammonium peroxide.
  • the oxidizing agent is not molecular oxygen or air.
  • the method comprises the steps of (a) heating wood chips in a pre-cooker using water or steam, (b) then cooking the wood chips using steam in a cooker, and then (c) defibrating the wood chips in a refiner so that fiber material and exhaust air are produced.
  • the exhaust air contains steam or condensed steam, i.e. air with liquid droplets.
  • Cooking the wood chips means in particular that the wood chips are heated with water and/or steam.
  • the wood chips are preferably first placed in the pre-cooker and then in the cooker.
  • the invention also relates to a method for producing a wood fiber board, in which the above-mentioned method is carried out.
  • a wood fiber board is understood to mean in particular an LDF, MDF or HDF.
  • the fiber material is wood fibers.
  • the invention also relates to a method for producing insulating material or plant substrate for plant cultivation, in the context of which the above-mentioned method is carried out.
  • the invention also relates to a method for producing a chipboard, in the context of which the above-mentioned method is carried out.
  • the method preferably comprises the steps of (a) chipping round wood, wood residues and/or waste wood to produce wood chips, (b) drying the wood chips, (c) applying glue to the wood chips, (d) spreading the glued wood chips and shaping them into a chip mat and (e) pressing the chip mat into a chipboard. It is possible for the wood chips to be spread in several layers.
  • the method preferably comprises the steps of (a) chipping round wood, wood residues and/or waste wood to produce coarse chips, (b) drying the coarse chips, (c) applying glue to the coarse chips, (d) spreading the glued coarse chips to form a chip mat and (e) pressing the chip mat to form an OSB board.
  • the coarse chips can be scattered in several layers.
  • the preferred orientations of the coarse chips in at least two adjacent layers differ.
  • the preferred orientation of the second layer runs transversely to the preferred orientation of the first layer, onto which the second layer is applied.
  • the preferred orientation of the first layer runs along the conveying direction in which the chip mat moves
  • the preferred orientation of the second layer preferably runs transversely to the direction of travel.
  • the preferred orientation is the direction in which most of the longitudinal axes of the (elongated) coarse chips extend.
  • VOC concentration c VOC,1 i.e. the concentration of volatile organic substances, in particular terpenes and/or aldehydes, in the exhaust air, is measured continuously.
  • the VOC concentration c VOC,1 is given, for example, in mass per exhaust air volume or in mass fraction of the exhaust air.
  • the VOC concentration is understood to be a concentration that can be used to determine the concentration of volatile organic components.
  • the TOC concentration of all organic carbon compounds is also a VOC concentration when it comes to complying with an upper limit.
  • the introduction of the oxidizing agent into the exhaust air is controlled based on the VOC concentration.
  • the amount of oxidizing agent, namely the oxidizing agent flow, which is introduced into the exhaust air is increased when the VOC concentration increases.
  • the amount of The amount of oxidizing agent introduced into the exhaust air can be reduced when the VOC concentration falls. In this way, on the one hand, enough oxidizing agent is always introduced into the exhaust air and, on the other hand, the consumption of oxidizing agent is minimized. It is advantageous if this VOC concentration is measured in the direction of exhaust gas flow before an introduction point at which the oxidizing agent is introduced into the exhaust air.
  • the method comprises the steps of (a) comparing the VOC concentration c VOC,1 with a limit concentration c VOC,G and (b) if the VOC concentration c VOC,1 falls below the limit concentration c VOC,G , introducing an idle flow of oxidizing agent, in particular no oxidizing agent.
  • an idle flow of oxidizing agent to be introduced into the exhaust air, for example in order to be able to quickly increase the oxidizing agent flow if this becomes necessary.
  • the idle flow is a volume flow of oxidizing agent that is smaller than the oxidizing agent flow that is necessary if the amount of VOC is to be reduced.
  • the idle flow is at most one fifth, in particular one tenth, of the flow that is introduced when the limit concentration is exceeded.
  • an oxidizing agent stream is preferably introduced into the exhaust air, whereby the oxidizing agent stream is selected such that a discharge VOC concentration (c VOC,A ) in the exhaust air that is discharged into the environment is below a specified exhaust air limit concentration c VOC,BREV .
  • the exhaust air limit concentration is, for example, a legal requirement.
  • c VOC,BREV 400 ⁇ g/m 3 can apply.
  • the volume is preferably measured in standard cubic meters, i.e. the volume of the gas under standard conditions (23 °C, 1013 hPa).
  • a second VOC concentration of volatile organic substances is continuously measured in the exhaust air. This is carried out in particular in the exhaust air flow direction behind an introduction point at which oxidizing agent is introduced into the exhaust air.
  • the introduction of the oxidizing agent into the exhaust air is also or exclusively controlled or regulated based on the second VOC concentration.
  • the amount of oxidizing agent introduced per unit of time is increased. This occurs in particular even if the first VOC concentration does not change.
  • the oxidizing agent flow is reduced according to a preferred embodiment. This occurs in particular even if the first VOC concentration does not change.
  • the method comprises the step of irradiating the oxidizing agent with UV light. This results in the oxidizing agent forming radicals, for example, when a suitable oxidizing agent is used. If the oxidizing agent is hydrogen peroxide, for example, hydroxyl radicals are formed. These react particularly quickly with VOCs.
  • the oxidizing agent is irradiated with UV light immediately before it is introduced into the exhaust air.
  • the distance between the point at which the oxidizing agent is irradiated with UV light and the point at which the oxidizing agent first comes into contact with the diverted steam is at most 10 m, in particular at most 5 m.
  • the exhaust air has an exhaust air temperature of at least 40°C when the oxidizing agent is introduced.
  • the oxidizing agent reacts more quickly with the volatile organic substances, so that lower concentrations of volatile organic substances can be achieved in the purified steam.
  • the exhaust air has a pressure of at least 1.2 bar and/or at most 5 bar.
  • the method preferably comprises the step of drying the wood material, in particular the wood chips, the coarse chips or the wood fibers. Exhaust air generated during drying is preferably cleaned as described above by introducing the oxidizing agent before the exhaust air is released into the environment.
  • the method preferably comprises the step of applying glue to the wood material, in particular by means of a blow line.
  • the glued fiber material is dried.
  • the method comprises the steps of spreading the, in particular dried and/or glued, fiber material to form a fiber cake and pressing the fiber cake to form a wood-based panel, in particular a chipboard, an MDF, an MDF or an HDF panel or an OSB panel.
  • the pressing is carried out, for example, by means of a belt press.
  • a wood material manufacturing device preferably has a chimney which is connected to the exhaust air cleaner for releasing the cleaned exhaust air into the environment.
  • the exhaust air cleaner can have an oxidizing agent tank that is filled with oxidizing agent, for example hydrogen peroxide.
  • the exhaust air cleaner also has a pump for conveying the oxidizing agent to the introduction device.
  • the exhaust air cleaner can have an oxidizing agent generator by means of which oxidizing agent can be produced.
  • the oxidizing agent generator can be an ozone generator.
  • the exhaust air cleaner can have an oxidizing agent container in which oxidizing agent can be stored.
  • the oxidizing agent container is filled with hydrogen peroxide.
  • the wood fibre board manufacturing device has a VOC concentration meter for measuring a (first) VOC concentration of volatile organic substances, in particular terpenes or aldehydes, and/or the total concentration of organic carbon compounds in the exhaust air in the exhaust gas flow direction upstream of an introduction point at which the oxidising agent is introduced into the exhaust air.
  • the feeder is preferably designed to automatically introduce the oxidizing agent into the exhaust air based on the measured VOC concentration.
  • the feeder controls or regulates the oxidizing agent flow.
  • the feeder contains a controllable pump and/or a controllable valve for this purpose.
  • the VOC concentration meter comprises, for example, a gas chromatograph with a flame ionization detector.
  • the VOC concentration meter is preferably designed to automatically measure the VOC concentration at regular intervals, for example more frequently than once per hour, in particular more frequently than once per half hour, particularly preferably more frequently than once per 10 minutes.
  • the feeder is designed to detect the VOC concentration from the VOC concentration meter and to automatically introduce the oxidizing agent into the exhaust air based on the VOC concentration and the exhaust air flow.
  • an oxidizing agent volume flow of oxidizing agent that is introduced into the exhaust air per unit of time is calculated, in particular based on the VOC concentration and, if applicable, the exhaust air flow, and the oxidizing agent is then introduced accordingly.
  • the wood material manufacturing device preferably has a first introduction device for introducing the oxidizing agent into the exhaust air at a first introduction point.
  • the exhaust air purifier is designed to regulate the VOC concentration to a specified VOC target concentration.
  • the oxidizing agent volume flow is adjusted so that the measured VOC concentration approaches the VOC target concentration. If the measured VOC concentration is above the VOC target concentration, the oxidizing agent volume flow is increased. If the measured VOC concentration is below the VOC target concentration, the oxidizing agent volume flow is reduced.
  • the wood material manufacturing device has a second VOC concentration meter for measuring a second VOC concentration (or a second TOC concentration) in the exhaust air in the exhaust gas flow direction behind the introduction point.
  • the feeder is preferably designed to automatically introduce the oxidizing agent into the exhaust air based on the first VOC concentration and the second VOC concentration, and optionally the exhaust air flow.
  • the feeder is designed to control or regulate the oxidizing agent volume flow based on the first and the second VOC concentration. It is possible for the wood material manufacturing device to have a VOC concentration meter in the exhaust gas flow direction behind the introduction point. In this case, the second VOC concentration meter can simply be called a VOC concentration meter.
  • the wood material manufacturing device preferably has a second introduction device for introducing the oxidizing agent into the exhaust air at a second introduction point, which is located behind the first introduction point in the exhaust gas flow direction.
  • the second introduction point is preferably located behind the second VOC concentration meter. It is advantageous if the exhaust air cleaner is designed to control a second oxidizing agent volume flow of oxidizing agent, which is introduced at the second introduction point, depending on the second VOC concentration.
  • the exhaust air cleaner is designed to regulate the second VOC concentration to a predetermined second VOC target concentration. If the measured second VOC concentration deviates from the second VOC target concentration, the first and/or second oxidizing agent volume flow is adjusted so that the measured second VOC concentration approaches the second VOC target concentration. If the measured second VOC concentration is above the second VOC target concentration, the first and/or second Oxidizing agent volume flow is increased. If the measured second VOC concentration is below the second VOC target concentration, the first and/or the second oxidizing agent volume flow is reduced. For example, the VOC target concentration is below the exhaust air limit concentration c VOC,BREV .
  • the wood material manufacturing device preferably has a gluing device for gluing the fiber material.
  • a gluing device is understood to be a device by means of which the fiber material can be glued.
  • the gluing device can also be referred to as a gluing bucket.
  • the invention also relates to a wood-based panel manufacturing device for manufacturing a wood-based panel, which has a wood-based panel manufacturing device according to the invention.
  • the wood-based panel manufacturing device is, for example, a wood fiberboard manufacturing device for manufacturing light, medium-density fiberboard (LDF), medium-density fiberboard (MDF) and/or high-density fiberboard (HDF), which has the wood-based panel manufacturing device according to the invention.
  • the wood-based panel manufacturing device is a chipboard manufacturing device for manufacturing chipboard.
  • the wood-based panel manufacturing device is an OSB manufacturing device for manufacturing coarse chipboard.
  • the wood fiber board manufacturing device preferably has (a) a cooker for cooking wood chips by means of steam so that cooked wood chips are produced, (b) a refiner, which is arranged behind the cooker in the direction of wood material flow, for defibrating the cooked wood chips so that fiber material is produced and optionally (c) a gluing device, in particular a blow line, arranged behind the refiner in the direction of wood material flow for gluing the fiber material so that glued fiber material is produced.
  • the wood fiber board manufacturing device preferably has a spreader for spreading dried fiber material to form a fiber cake. It is advantageous if the wood fiber board manufacturing device has a press, in particular a belt press, for pressing the fiber cake to form wood fiber boards.
  • a wood fiber board is a board that is made using wood.
  • the wood fiber board preferably has a thickness of between 2 mm and 60 mm.
  • the density of the wood fiber board is preferably between 600 kg per cubic meter and 1000 kg per cubic meter.
  • Insulation material is understood to mean, in particular, panel-shaped insulation material. This can have a density of between 50 and 400 kg per cubic meter.
  • the thickness of the panel-shaped insulation material is preferably 2 to 800 mm.
  • a chipboard manufacturing device preferably has a spreader for spreading a fiber cake made of glued wood material in the form of wood chips to form a fiber cake and a hot press for pressing the fiber cake into the chipboard.
  • An OSB manufacturing device or a chipboard manufacturing device preferably has a spreader which is designed to spread a first cover layer, a middle layer on the first cover layer and a second cover layer on the middle layer. It is advantageous if the median of the size distribution of the chips in the middle layer is smaller, in particular at least 15% smaller, than the median of the size distribution of the chips in the first cover layer and/or the second cover layer.
  • a sifter is arranged in front of the spreader in the direction of wood material flow, by means of which wood material particles whose size lies outside a predetermined target size interval are removed.
  • FIG. 1 shows a flow chart of a wood material manufacturing device 10 according to the invention for producing wood material 11.
  • the wood material manufacturing device 10 has a cooker 14 which receives wood chips 18 heated from a pre-cooker 16.
  • the wood chips 18 were cleaned in the pre-cooker 16 so that the pre-cooker 16 has the function of a washing system.
  • the wood material manufacturing device can have a separate washing system 24.
  • a refiner 32 is arranged behind the cooker 14 in the wood material flow direction H, by means of which the wood chips 18 coming from the cooker 14 are shredded. Together with steam 26, a steam-fiber material mixture 38 is thus created.
  • the steam-fiber material mixture 38 can be fed to a gluing device 40, the preferably designed as a blow line, but this is not necessary.
  • the steam-fiber material mixture 38 can also be fed to a dryer 44, from which exhaust air 45 and dried wood material 11 leave, but the dryer is also not necessary. Exhaust air 45 that is created in the dryer 44.
  • the particle load of the exhaust air 45 can be reduced by means of an optional wet electrostatic precipitator 47.
  • the wood-based material 11 is used, for example, for the production of insulation material, medium-density fibreboards (MDF), lightweight medium-density fibreboards (LDF), high-density fibreboards (HDF), plant substrate for plant cultivation, for example potting soil, or packaging material.
  • MDF medium-density fibreboards
  • LDF lightweight medium-density fibreboards
  • HDF high-density fibreboards
  • plant substrate for plant cultivation for example potting soil, or packaging material.
  • the exhaust air cleaner 52 is described below in connection with Figure 4 described in detail.
  • the wood material manufacturing device 10 is part of a wood material panel manufacturing device 76, in the present case in the form of a wood fiber panel manufacturing device.
  • the wood chips 18 can be produced from fresh wood 22, fresh wood chips 23 or recycled wood 25 by means of a shredder 20.
  • the wood-based panel manufacturing device 76 has a sifter 78 which removes wood-based particles outside a predetermined target size interval.
  • a fiber cake 48 is spread from the wood-based material 11 by means of a spreader 46 and pressed into the wood fiber panels 12 by means of a press 50, in particular a hot press.
  • FIG. 2 shows a second wood material manufacturing device 10, which is part of a wood material panel manufacturing device 76 in the form of an OSB manufacturing device.
  • the wood chips 18 are produced by means of the shredder 20, for example a chipper, and dried in the dryer 44.
  • the resulting exhaust air 45 is cleaned by means of the exhaust air cleaner 52 described below and then passes into the chimney 67.
  • the sifter 78 and the spreader 46 are arranged behind the dryer 44 in the direction of wood flow H.
  • the sifter 78 classifies the particles of the wood material 11 into top layer particles and middle layer particles.
  • the spreader 46 spreads a first top layer D1 made of top layer particles, a middle layer M made of middle layer particles arranged on the top layer D1 and a second top layer D2 made of top layer particles arranged on the middle layer M. These layers are pressed by the press 50 to form an OSB 80.
  • FIG. 3 shows a third wood material manufacturing device 10, which is part of a wood material panel manufacturing device 76 in the form of a chipboard manufacturing device for producing a chipboard 82.
  • the chips 18 produced by the shredder 20 are dried in the dryer 44 and the resulting exhaust air 45 is cleaned in the exhaust air cleaner 52 described below before it reaches the chimney 67.
  • the classifier 78 classifies the particles of the wood material 11 into cover layer particles and middle layer particles.
  • the spreader 46 spreads a fiber cake 48 consisting of a first cover layer D1 made of cover layer particles, a middle layer made of middle layer particles arranged on the first cover layer D1 and a second cover layer D2 made of cover layer particles arranged on the middle layer M.
  • the fiber cake 48 is pressed into the chipboard 82 by means of the press 50.
  • FIG 4 shows a further wood material manufacturing device 10 according to the invention and a wood material panel manufacturing device 76 according to the invention.
  • the wood chips 18 produced by the shredder 20 are heated with steam 26 from a steam generator 28 in the pre-cooker and then cooked in the cooker 14. They are then shredded in the refiner 32, the steam-fiber material mixture 38 is glued in the gluing device 40 and then dried in the dryer 44.
  • the exhaust air cleaner 52 is arranged behind the dryer 44 in the material flow direction M. This introduces an oxidizing agent 56 into the exhaust air 45 at an introduction point 54.
  • the oxidizing agent is hydrogen peroxide H 2 O 2 .
  • the exhaust air cleaner 52 comprises an oxidant source 58, which in the present case an oxidizing agent container 58 and a feeder 60 in the form of an oxidizing agent pump.
  • the exhaust air cleaner 52 measures a first VOC concentration c VOC,1 of volatile organic components in the exhaust air 45 by means of a VOC concentration meter 62.
  • an oxidizing agent volume flow Qse of oxidizing agent 56 is introduced, for example sprayed, into the exhaust air 45 by means of an introduction device 57 at the introduction point 54.
  • the oxidizing agent 56 reacts with volatile organic components in the exhaust air 45.
  • the exhaust air cleaner 52 can have a second VOC concentration meter 64, which is located behind the introduction point 54 in the exhaust gas flow direction D.
  • the second VOC concentration meter measures a second VOC concentration c VOC,2 . In the present case, this is the TOC concentration of the total concentration of organic compounds. If the second VOC concentration c VOC,2 is above a predetermined maximum concentration c VOC,max , the oxidizing agent volume flow Q 56 is increased.
  • the maximum concentration corresponds to a specified exhaust air limit concentration c VOC,BREV , which is a legal requirement, for example.
  • the maximum concentration is smaller than the exhaust air limit concentration c VOC,BREV .
  • c VOC,max f * c VOC,BREV with a safety factor fe [0.75, ...,1]. The smaller the safety factor, the lower the probability that the exhaust air limit concentration c VOC,BREV will be exceeded at any time, but the higher the consumption of oxidizing agent.
  • the exhaust air cleaner 52 regulates the second VOC concentration c VOC,2 to a VOC target concentration c VOC,target by increasing or decreasing the oxidizing agent volume flow Q 56 .
  • the exhaust air cleaner 52 it is possible for the exhaust air cleaner 52 to have an introduction device, for example a nozzle 66, for introducing oxidizing agent at a second introduction point 54.2 in the exhaust gas flow direction D behind the second VOC concentration meter 64.
  • an introduction device for example a nozzle 66
  • the oxidizing agent volume flow Q 56 is increased if the second VOC concentration c VOC,2 . is above the maximum concentration c VOC,max . It is possible, but not necessary, that the same oxidizing agent is introduced at both introduction points 54, 54.2. In particular, it is possible that 2 different oxidizing agents are used.
  • the exhaust air cleaner 52 prefferably has only one VOC concentration meter 64, which is arranged behind the introduction point 54 in the steam flow direction D, wherein oxidizing agent is only introduced into the exhaust air 45 at this one introduction point 54.
  • the introduction of the oxidizing agent produces purified exhaust air 45.2, which is released into the environment via a chimney 67.
  • the exhaust air cleaner 52 can have a light source 74 by means of which the oxidizing agent 56 can be irradiated with UV light. In this way, hydroxyl radicals are formed, which particularly effectively destroy the volatile organic substances in the diverted steam 26.
  • An exhaust air temperature T 45 is, for example, 45°C ⁇ 5°C.
  • the oxidizing agent 56 in this case is a 5 percent (weight percent) hydrogen peroxide solution.
  • One standard cubic meter is the amount of gas that occupies 1 cubic meter under standard conditions of 1013 hPa and 23°C.
  • the wood material manufacturing device 10 can be part of a wood material panel manufacturing device 76, which comprises a spreader 46 for spreading glued wood material 11 on a conveyor belt so that a fiber cake 48 is formed.
  • the fiber cake 48 is pressed into a wood fiber panel 12 by means of a press 50.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP23171473.4A 2023-05-04 2023-05-04 Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois Pending EP4458538A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23171473.4A EP4458538A1 (fr) 2023-05-04 2023-05-04 Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois
CN202480029477.4A CN121175157A (zh) 2023-05-04 2024-04-09 用于制造木基材料的方法和木基材料制造设备
PCT/EP2024/059617 WO2024227566A1 (fr) 2023-05-04 2024-04-09 Procédé de fabrication d'un matériau en bois et dispositif de fabrication de matériau en bois

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23171473.4A EP4458538A1 (fr) 2023-05-04 2023-05-04 Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois

Publications (1)

Publication Number Publication Date
EP4458538A1 true EP4458538A1 (fr) 2024-11-06

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EP23171473.4A Pending EP4458538A1 (fr) 2023-05-04 2023-05-04 Procédé de fabrication d'un matériau dérivé du bois et dispositif de fabrication du matériau dérivé du bois

Country Status (3)

Country Link
EP (1) EP4458538A1 (fr)
CN (1) CN121175157A (fr)
WO (1) WO2024227566A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882612A (en) * 1973-07-27 1975-05-13 Moore Dry Kiln Co Method and apparatus for limiting the concentration of combustible volatiles in dryer emissions
US4925527A (en) 1989-02-22 1990-05-15 Ahlstromforetagen Svenska Ab Method for the recovery of turpentine and heat in a refiner pulping process
US20070081933A1 (en) * 2005-10-07 2007-04-12 Stephane Chabot Process for reducing the formaldehyde content of a gas
US20150107749A1 (en) * 2013-10-18 2015-04-23 Unilin, Bvba Process and Device for Gluing Dried Fibers Designated for the Production of Fiberboards
EP2974841A1 (fr) * 2014-07-04 2016-01-20 Fritz Egger GmbH & Co. OG Procede de fabrication d'un panneau de fibres
EP3981498A1 (fr) * 2020-10-12 2022-04-13 Hitachi Zosen Inova AG Procédé de purification d'un mélange de gaz par ajout d'ozone

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882612A (en) * 1973-07-27 1975-05-13 Moore Dry Kiln Co Method and apparatus for limiting the concentration of combustible volatiles in dryer emissions
US4925527A (en) 1989-02-22 1990-05-15 Ahlstromforetagen Svenska Ab Method for the recovery of turpentine and heat in a refiner pulping process
US20070081933A1 (en) * 2005-10-07 2007-04-12 Stephane Chabot Process for reducing the formaldehyde content of a gas
US20150107749A1 (en) * 2013-10-18 2015-04-23 Unilin, Bvba Process and Device for Gluing Dried Fibers Designated for the Production of Fiberboards
EP2974841A1 (fr) * 2014-07-04 2016-01-20 Fritz Egger GmbH & Co. OG Procede de fabrication d'un panneau de fibres
EP3981498A1 (fr) * 2020-10-12 2022-04-13 Hitachi Zosen Inova AG Procédé de purification d'un mélange de gaz par ajout d'ozone

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WO2024227566A1 (fr) 2024-11-07
CN121175157A (zh) 2025-12-19

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