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WO2025078165A1 - Procédé permettant de produire un matériau en fibres de bois, et dispositif de production de matériau en fibres de bois - Google Patents

Procédé permettant de produire un matériau en fibres de bois, et dispositif de production de matériau en fibres de bois Download PDF

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Publication number
WO2025078165A1
WO2025078165A1 PCT/EP2024/077085 EP2024077085W WO2025078165A1 WO 2025078165 A1 WO2025078165 A1 WO 2025078165A1 EP 2024077085 W EP2024077085 W EP 2024077085W WO 2025078165 A1 WO2025078165 A1 WO 2025078165A1
Authority
WO
WIPO (PCT)
Prior art keywords
vapors
concentration
cvoc
wood
fiber 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.)
Pending
Application number
PCT/EP2024/077085
Other languages
German (de)
English (en)
Inventor
Josef Hofer
Joachim Hasch
Norbert Kalwa
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
Publication of WO2025078165A1 publication Critical patent/WO2025078165A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • 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
    • F26B23/001—Heating arrangements using waste heat
    • F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
    • 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
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/009—Alarm systems; Safety sytems, e.g. preventing fire and explosions
    • 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 for producing a wood fiber material, comprising the steps of (a) preferably providing fiber material and/or burning a fuel in a furnace to produce exhaust gas, (b) drying fiber material in a dryer using the exhaust gas to produce dried fiber material and vapors, and (c) discharging vapors into the environment and preferably (e) returning a portion of the vapors to the furnace to burn volatile organic substances contained in the returned vapors.
  • the invention also relates to a method for producing a wood-based panel, which comprises the method according to the invention for producing the wood fiber material.
  • the invention relates to a wood fiber production device for producing a wood fiber material, comprising (a) a furnace for burning a fuel to produce exhaust gas, (b) a refiner designed to defiberize wood chips to produce fiber material, (c) a dryer arranged downstream of the refiner in the direction of wood material flow for drying the fiber material using the exhaust gas to produce vapors, and (d) an exhaust air system for discharging vapors generated in the dryer during drying of the fiber material into the environment, and preferably (e) a branch connected to the dryer for returning a portion of the vapors to the furnace.
  • the invention also relates to a wood-based panel production device, which is designed in particular for producing a medium-density or high-density fiberboard, which comprises a wood fiber production device according to the invention.
  • volatile organic substances especially terpenes and aldehydes, are released during the drying of the fiber material. Emissions of volatile organic substances into the environment must be limited to comply with legal requirements.
  • VOCs volatile organic compounds
  • the recirculation proportion of the vapors returned to the furnace is at most 35 percent by weight, in particular at most 30 percent by weight.
  • a higher recirculation proportion may lead to an accumulation of water in the exhaust gases used to dry the fiber material, which is undesirable.
  • the recirculation proportion is at least 10 percent by weight.
  • the recirculation proportion it is possible for the recirculation proportion to be temporarily below 10 percent by weight, in particular zero, at most half the time. In other words, the recirculation proportion is preferably at least 10 percent by weight if vapors are recirculated at all.
  • the diversion of the steam in particular the diverted steam mass flow
  • a material flow control of the diverted steam provided according to a preferred embodiment, can be independent of the type and/or properties of the wood chips used. This facilitates the control of the wood fiberboard production device. Instead, the oxidizing agent volume flow can be controlled to always keep the concentration of volatile organic substances below a predetermined maximum.
  • the method comprises the step of irradiating the oxidizing agent with UV light.
  • the oxidizing agent forming radicals, in particular hydroxyl radicals.
  • the oxidizing agent is irradiated with UV light immediately before being introduced into the diverted vapor.
  • 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 vapor is at most 10 m, in particular at most 5 m.
  • the branched steam has a steam temperature of at least 110°C when the oxidant is introduced. At higher temperatures, the oxidant reacts more quickly with the volatile organic substances, so that lower concentrations of volatile organic substances can be achieved in the purified steam. It is advantageous if the steam temperature is at most 160°C. At even higher temperatures, the oxidant generally decomposes too quickly.
  • the branched steam has a pressure of at least 2 bar and/or at most 5 bar. The more volatile organic substances are broken down by introducing the oxidizing agent into the diverted steam, the lower the VOC concentration in the vapors discharged into the environment.
  • the recirculation fraction is selected to be close to the maximum possible recirculation fraction, in particular at least 0.8 times, particularly preferably at least 0.85 times, in particular at least 0.9 times, the maximum possible recirculation fraction.
  • the maximum possible recirculation fraction is the recirculation fraction for which a higher recirculation fraction impairs the functionality of the dryer to such an extent that a predetermined degree of drying can no longer be achieved. In this way, the consumption of oxidizing agent is kept low.
  • the process comprises the step of introducing an oxidizing agent into the vapors before they are released into the environment.
  • the oxidizing agent is released into the portion of the vapors that are not fed into the furnace. In this way, predetermined limits for the content of volatile organic substances in the vapors that are released into the environment are reliably maintained.
  • the oxidizing agent is introduced into the vapors or the branched-off steam in such a way that the oxidizing agent oxidizes the volatile organic substances without catalysis.
  • the wood pulp production device While it is possible and encompassed by the invention for the wood pulp production device to have a catalyst arranged to catalyze the reaction of the oxidizing agent with volatile organic substances, its effects are reduced due to the solids content.
  • the wood-based panel manufacturing device is preferably designed to produce an MDF or an HDF.
  • Figure 1 is a flow diagram of a wood fiber production device according to the invention, which is part of a wood-based panel production device according to the invention and is designed to carry out a method according to the invention and
  • Figure 2 shows a flow diagram of a wood pulp manufacturing apparatus according to a second embodiment of the invention for carrying out a method according to the invention.
  • FIG. 1 shows a wood fiber production device 10 according to the invention, which is part of a wood-based panel production device 12 according to the invention for producing a wood-based panel in the form of a wood fiber board 14.
  • the wood fiber production device 10 has a furnace 16, which has a mixing chamber 18, a burner 20, and a combustion chamber 22.
  • Fuel 24, for example in the form of wood, wood residues, gas and/or oil, and air 26 are supplied to the burner 20.
  • the combustion of the fuel 24 produces exhaust gas 27.
  • the exhaust gas 27 is fed to a dryer 28, to which fiber material, in particular glued fiber material 30', is also fed.
  • the dryer 28 dries the fiber material 30, producing a wood fiber material 32 in the form of dried fiber material 32 and vapors 34.
  • the vapors 34 are fed to an exhaust air system 36.
  • the exhaust air system 36 may include a gas scrubber 38 and/or an electrostatic precipitator 40, particularly in the form of a wet electrostatic precipitator.
  • the exhaust air system 36 discharges vapors 34 into the environment 44, particularly via a chimney 42.
  • a return stream QR of the vapors 34 can be fed into the furnace 16, whereas a QA is fed to the exhaust air system 36.
  • the branch 46 is arranged at a point in the material flow direction M behind a separator 47 by means of which the dried fiber material 32 is separated from the vapors 34 is separated.
  • the branch 46 is arranged less than 50 m, in particular less than 30 m, behind the separator.
  • the currents QR, QA are measured in weight or mass per unit of time, for example, newtons or kilograms per minute.
  • a feedback component
  • VOC concentration meter 50 which is arranged downstream of the dryer 28 in the material flow direction M and is connected to the control unit 48, a total concentration cvoc st of volatile organic substances is measured as a function of time t, so that the respective time-dependent concentration cvoc st is obtained.
  • the wood pulp production device can have a washer 52 for washing wood chips 54, which can be made, for example, from fresh wood 56 and/or recycled wood 58.
  • the washer can also be designed as a pre-cooker or have a pre-cooker.
  • a cooker 60 is preferably arranged behind the washer 52 in the material flow direction M, by means of which the wood chips 54 are cooked using steam.
  • Behind the digester 60 is a refiner 62 for defibrating the wood chips 54, creating the fiber material 30.
  • the fiber material 30 is glued in a blow line 64.
  • the exhaust air cleaner 252 is arranged in the exhaust gas flow direction D behind the second VOC concentration meter 264 has an introduction device, for example a nozzle 266, for introducing oxidizing agent at a second introduction point 254.2.
  • the oxidizing agent volume flow 0256 it is possible for the oxidizing agent volume flow 0256 to be increased if the second VOC concentration cvoc,2 is above the maximum concentration CV0C,max. It is possible, but not necessary, for the same oxidizing agent to be introduced at both introduction points 254, 254.2. In particular, it is possible for two different oxidizing agents to be used.
  • the wood fiber production device 10 and/or the wood-based panel production device 12 can have either the branch 46 and the steam cleaner 152 or the branch 46 and the exhaust air cleaner 252 or only the branch 46 or the branch 46, the steam cleaner 152, and the exhaust air cleaner 252.
  • the branch 46 is controlled such that the limit value Climit of VOC in the exhaust air 245 that enters the environment is maintained and, in addition, the consumption of oxidizing agent 158, 258 is minimized.
  • the recirculation portion R is automatically increased by the control unit 48.
  • the maximum nitrogen concentration CNOx,max is selected such that a predetermined limit value CNOx,limit of the nitrogen oxide concentration of nitrogen oxides at the outlet point 51 is not exceeded.
  • the limit value CNOx,limit 40 pg/m 3 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

L'invention se rapporte à un procédé permettant de produire un matériau en fibres de bois (32), comprenant les étapes consistant : à fournir un matériau fibreux (30) ; à brûler un combustible (24) dans un système de cuisson (16) de sorte que du gaz résiduaire (27) est produit ; à sécher le matériau fibreux (30) dans un séchoir (28) au moyen du gaz résiduaire (27) de sorte qu'un matériau fibreux séché (32) et des vapeurs (34) sont produits ; et à évacuer les vapeurs (34) dans l'environnement (44), à remettre en circulation une partie des vapeurs (34) dans le système de cuisson (16) de sorte que des substances organiques volatiles contenues dans les vapeurs remises en circulation (34) sont brûlées par les étapes consistant : à mesurer une concentration totale (cvoc) de substances organiques volatiles dans les vapeurs (34) et à modifier la partie remise en circulation (R) de vapeurs remises en circulation (34) en fonction de la concentration totale (cvoc).
PCT/EP2024/077085 2023-10-10 2024-09-26 Procédé permettant de produire un matériau en fibres de bois, et dispositif de production de matériau en fibres de bois Pending WO2025078165A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23202713.6A EP4538452A1 (fr) 2023-10-10 2023-10-10 Procédé de fabrication d'une matière fibreuse de bois et dispositif de fabrication de matière fibreuse de bois
EP23202713.6 2023-10-10

Publications (1)

Publication Number Publication Date
WO2025078165A1 true WO2025078165A1 (fr) 2025-04-17

Family

ID=88373774

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/077085 Pending WO2025078165A1 (fr) 2023-10-10 2024-09-26 Procédé permettant de produire un matériau en fibres de bois, et dispositif de production de matériau en fibres de bois

Country Status (2)

Country Link
EP (1) EP4538452A1 (fr)
WO (1) WO2025078165A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110056090A1 (en) 2009-09-07 2011-03-10 Andrtitz Technology and Asset Management GmbH Wood material drying plant comprising a rotary dryer
WO2018157945A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois, comprenant un cyclone à gaz chaud
WO2020180225A1 (fr) * 2019-03-01 2020-09-10 Valmet Ab Système et procédé de raffinage de matériau de biomasse lignocellulosique
EP4122662A1 (fr) * 2021-07-23 2023-01-25 Fiberboard GmbH Procédé de fabrication de panneau fibreux à émission réduite de cov

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110056090A1 (en) 2009-09-07 2011-03-10 Andrtitz Technology and Asset Management GmbH Wood material drying plant comprising a rotary dryer
WO2018157945A1 (fr) 2017-03-03 2018-09-07 Douglas Technical Limited Appareil et procédé de séchage continu de produits en vrac, en particulier de copeaux de bois et/ou de fibres de bois, comprenant un cyclone à gaz chaud
WO2020180225A1 (fr) * 2019-03-01 2020-09-10 Valmet Ab Système et procédé de raffinage de matériau de biomasse lignocellulosique
EP4122662A1 (fr) * 2021-07-23 2023-01-25 Fiberboard GmbH Procédé de fabrication de panneau fibreux à émission réduite de cov

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