EP2573258B1 - Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff - Google Patents

Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff Download PDF

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Publication number
EP2573258B1
EP2573258B1 EP11182491.8A EP11182491A EP2573258B1 EP 2573258 B1 EP2573258 B1 EP 2573258B1 EP 11182491 A EP11182491 A EP 11182491A EP 2573258 B1 EP2573258 B1 EP 2573258B1
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Prior art keywords
wood chips
water
chips
heated
wood
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Application number
EP11182491.8A
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German (de)
English (en)
French (fr)
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EP2573258A1 (de
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
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Kronotec AG
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Application filed by Kronotec AG filed Critical Kronotec AG
Priority to EP11182491.8A priority Critical patent/EP2573258B1/de
Priority to PL11182491T priority patent/PL2573258T3/pl
Publication of EP2573258A1 publication Critical patent/EP2573258A1/de
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    • 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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials

Definitions

  • a generic device is in the WO 86/06769 disclosed by Sund's Defibrator.
  • the wood chips must be heated to temperatures of 140 ° C to 180 ° C for energy-saving operation of the shredding device, so that the need for mechanical energy for cutting the chips into fibers is minimized.
  • the water in or on the wood chips is evaporated. The water vapor thus obtained is collected and used to heat the wood chips. This method is used in industry.
  • the chips are mixed in a washing device with large amounts of cold water and transported. In this case, a large proportion of impurities is already deposited.
  • the wood chips are transported by a pump into a first dewatering device. Via screws, which run in sieves and thus separate water and wood chips, the moist chips are introduced into the pre-steam tank, where they are heated with steam to over 90 ° C.
  • the required amount of steam depends mainly on the woodchip temperature.
  • the washing and heating of the chips takes place up to about 90 ° C with hot water.
  • the heating medium steam is thus replaced by hot water, which was heated up to 98 ° C.
  • the same amount of wood chips with a lower volume of heating medium can be heated up to 90 ° C.
  • the volume of the heating medium is already significantly reduced.
  • the treatment of this wastewater thus requires smaller plants.
  • the heating of the chips up to 140 ° C (4bar) or up to 200 ° C (16bar) is done as before by steam.
  • a closed water cycle is set up for washing and heating the chips with water.
  • this water cycle is also used to transport the wood chips. Closing the cycle significantly reduces the amount of waste water, the volume of wastewater. The cycle is closed until either the up to 98 ° C heated water is too heavily loaded with dissolved ingredients, so that some or all of the water must be replaced or z. As dirt that has been washed out of the wood chips, must be discharged from the water cycle.
  • the heating of the water is particularly advantageous and economical when a heat exchanger is used in the water cycle.
  • the heat exchanger can be operated with any energy, eg. As steam or thermal oil. However, it is preferred if thermal oil is used.
  • the wash tank accepts freshly produced or stored wood chips or annual plants which may adhere to bark, ice, snow, soil or other soils undesirable in the pulp.
  • the chips are moved in the wash tank in hot water and thereby freed from each other and the impurities.
  • the wood chips are heated.
  • the washing container if necessary supplemented by lines and transfer device, is designed so that the wood chips linger long enough that they approximately or completely assume the temperature of the up to 98 ° C hot water.
  • the heated chips are then conveyed in the hot water to a transfer device.
  • the hot water is separated from the chips and in a closed water cycle z. B. via return lines, screens etc. returned to the wash tank.
  • the hot water thus circulates between the wash tank and the transfer device.
  • the transfer device is adapted to transfer the chips from the hot water to devices for further heating.
  • a first device precooker / buffer tank
  • the chips can be further heated with steam to around 98 ° C.
  • This also assumes the function of a buffer container, ensures a uniform and complete heating of the chips and it ensures a uniform supply of the device for defibering with preheated wood chips.
  • the wood chips are transferred to the digester.
  • This second transfer device can, for. B. be designed as a stuffing screw in which the chips form by increasing compression a plug, on the one hand drives out the water from the wood chips and the other is sufficiently vapor-tight to seal against the steam, with which the chips are then heated further.
  • the chips are further heated under pressure with steam to temperatures of about 140 ° C (about 4 bar) to about 200 ° C (about 16 bar), to then be defibered.
  • a heat exchanger is inserted into the water cycle.
  • the heat exchanger is used to heat the water of the water cycle through a heating medium up to 98 ° C, without mixing the heating medium and water.
  • the heat exchanger is preferably heated with thermal oil or steam. Steam is available when heating wood chips, because it is released and caught when defibrating the heated wood chips.
  • the water loop made for the hot water between the wash tank and the transfer device be designed to transport the wood chips from the wash tank to the transfer device in the water.
  • the chips are therefore preferably not stored only stationary in hot water. Rather, the chips are promoted with the up to 98 ° C hot water from the wash tank to the first transfer device. As a result, the chips are conveyed with the maximum temperature to be reached in the water from the water to the transfer device. The chips have then reached by the longer residence time in the water at this temperature maximum degree of softening. At the same time, it ensures that a maximum of wood constituents and other soluble wood constituents pass into the water. Accordingly, the load of the steam used to further heat the chips is reduced.
  • the filters can filter all or part of the water flow.
  • the filters and sieves are preferably used to remove coarse contaminants, eg. As solids such as bark particles that can be removed mechanically.
  • filters are used for separating dissolved or dispersed impurities in the water cycle, for.
  • the filters also include evaporators with which volatile impurities are removed from the water cycle.
  • the hot water is enriched with impurities, which usually do not interfere with the washing of wood chips.
  • impurities which usually do not interfere with the washing of wood chips.
  • the water which is hot up to 98 ° C., is exchanged.
  • a continuous inflow and outflow of water to the water cycle between the transfer device and the wash tank is established. In this way, the discharged from the water cycle, contaminated water can be processed in a continuously operating, designed for low volume flows cleaning system, so that it can be fed to a receiving water.
  • the device according to the invention has a washing container 1, a transport line 2 and a transfer device 3 and a return line 9 for hot, separated from the wood chips, a heat exchanger 10 and a supply line 12 for up to 98 ° C heated water, extending from the heat exchanger 10 extends to the wash tank 1.
  • the pre-steam tank 4 connects.
  • the pre-steam tank 4 can be used as a buffer tank to ensure a steady production.
  • the chips are discharged through a discharge device 5 and transferred to the digester 6, in which they are heated with steam to temperatures of 140 ° C to 200 ° C.
  • the chips H are already heated by the action of steam to 98 ° C and more.
  • a temperature of 140 ° C there is a pressure of 4 bar.
  • a temperature of 200 ° C there is a pressure of 16 bar.
  • the heated in the digester 6 depending on the action time up to the temperature of the steam or to a temperature of not more than 10 ° C below the steam temperature chips are promoted by a discharge screw 7 to the refiner 8, which defibrillates the chips between mutually rotating, profiled plates.
  • the device is operated as follows: In the water-filled washing container 1, on the one hand, chips H are fed.
  • the wood chips can either produced or already stored immediately before. These are usually softwood chips.
  • up to 98 ° C hot water is fed through the supply line 12 in the wash tank.
  • Hot water and wood chips are circulated in the washing tank, here indicated by a circulating device 13, for example a stirrer.
  • a circulating device 13 for example a stirrer.
  • By circulating and the action of the hot water impurities are removed from the wood chips.
  • Impurities that are present as solids sink to the bottom. They are withdrawn at the bottom of the washing container, usually by filters or strainers, not shown here.
  • Soluble impurities for example, resins, dyes and the like dissolve in the water. By recirculating the water they accumulate in the water. Soluble impurities can be partially filtered out eg by means of membrane filters. Part of the water is regularly discharged or washed off and replaced with purified water
  • the wood chips are directed by the circulating device 13 directed through the washing container 1 and moved to the transport line 2.
  • the chips are then pumped in hot water through the transport line 2. Even during transport through the transport line 2, the woodchips continue to absorb heat energy from the heated to 98 ° C water. The temperature gradient between the hot water and the wood chips present when feeding the chips into the washing container 1 is increasingly compensated.
  • the chips are transferred via the transfer device 3, a screw, the pre-steam tank and drained at the same time.
  • the Liberated water is fed via the return line 9, and via sieves (not shown) back into the wash water circuit.
  • the heated wood chips are heated by steam up to 98 ° C.
  • a discharge device 5 also a screw, is arranged, which further dehydrates the wood chips plasticized by the heat and forms a plug which seals the cooker under overpressure (eg under a pressure of 7 bar-12 bar) seals.
  • the transfer device 3 and the discharge device 5 are each designed, at least in sections, for dewatering. Hot water and wood chips are separated. The water is collected and the water circuit between the washing tank 1 and the transfer device 3 is closed by the transfer device 3 and the discharge device 5 via the return line 9.
  • the return line 9 leads to the heat exchanger 10.
  • the heat exchanger 10 is traversed on the one hand by water, which was used for heating wood chips, and which was thereby cooled.
  • the heat exchanger 10 is in a second conduit system 11 on the other hand by a heating medium, here thermal oil, flows through, which is hotter than the water, and which heats the water to up to 98 ° C. From the heat exchanger 10 leads the supply line 12 to the wash tank 1 and closes at this point the water cycle.
  • a heating medium here thermal oil
  • the water cycle thus has the following sections: wash tank 1, transport line 2, the transfer device 3, the pre-steam tank 4 and the discharge device 5, then the return line 9, supplemented by the heat exchanger 10 and the supply line 12th
  • the wood chips have at the transfer device 3, a temperature of about 90 ° C and the discharge device 5, a temperature of up to 98 ° C, since here already acts steam on the chips. They also have a reduced level of ingredients compared to washed chips that have not been heated to the temperature of the wash water. For heating the wood chips washed according to the invention and heated with water to the temperature required for defibering, less steam is required than in the prior art. The purification of the water is possible with known plants for wastewater treatment in an economical manner.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Paper (AREA)
EP11182491.8A 2011-09-23 2011-09-23 Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff Active EP2573258B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11182491.8A EP2573258B1 (de) 2011-09-23 2011-09-23 Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff
PL11182491T PL2573258T3 (pl) 2011-09-23 2011-09-23 Sposób i urządzenie do przygotowywania zrębków do wytwarzania drzewnej masy włóknistej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11182491.8A EP2573258B1 (de) 2011-09-23 2011-09-23 Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff

Publications (2)

Publication Number Publication Date
EP2573258A1 EP2573258A1 (de) 2013-03-27
EP2573258B1 true EP2573258B1 (de) 2014-04-30

Family

ID=44719458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11182491.8A Active EP2573258B1 (de) 2011-09-23 2011-09-23 Verfahren und Vorrichtung zum Aufbereiten von Hackschnitzeln für die Herstellung von holzhaltigem Faserstoff

Country Status (2)

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EP (1) EP2573258B1 (pl)
PL (1) PL2573258T3 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL4122662T3 (pl) 2021-07-23 2024-07-15 Fiberboard Gmbh Sposób wytwarzania płyt pilśniowych o zmniejszonej emisji voc

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8502210L (sv) 1985-05-06 1986-11-07 Sunds Defibrator Framstellning av mekanisk massa
FI103418B1 (fi) * 1996-01-31 1999-06-30 Sunds Defibrator Woodhandling Menetelmä ja laite selluloosamassan valmistamiseen käytettävän kuituaineksen esikäsittelemiseksi

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EP2573258A1 (de) 2013-03-27
PL2573258T3 (pl) 2014-09-30

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