EP0113353B1 - Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial - Google Patents

Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial Download PDF

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Publication number
EP0113353B1
EP0113353B1 EP83900743A EP83900743A EP0113353B1 EP 0113353 B1 EP0113353 B1 EP 0113353B1 EP 83900743 A EP83900743 A EP 83900743A EP 83900743 A EP83900743 A EP 83900743A EP 0113353 B1 EP0113353 B1 EP 0113353B1
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EP
European Patent Office
Prior art keywords
steam
preheater
grinding
pressure
gas
Prior art date
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Expired
Application number
EP83900743A
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English (en)
French (fr)
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EP0113353A1 (de
Inventor
Leif Klinga
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
Sunds Defibrator AB
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Publication date
Application filed by Sunds Defibrator AB filed Critical Sunds Defibrator AB
Priority to AT83900743T priority Critical patent/ATE20918T1/de
Publication of EP0113353A1 publication Critical patent/EP0113353A1/de
Application granted granted Critical
Publication of EP0113353B1 publication Critical patent/EP0113353B1/de
Expired legal-status Critical Current

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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
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • 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
    • D21D1/30—Disc mills

Definitions

  • This invention relates to a method and apparatus for producing fibre pulp from fibrous lignocellulose containing raw materials in which the conveying of the material to a preheater and also subsequently from the latter to a grinding apparatus is performed by a steam tight conveying device, and in which the material is preheated in the preheater by means of steam, and in which the preheated material thereafter'is ground at an increased pressure of steam or gas, between grinding discs which rotate relatively to one another in the grinding apparatus into a fibrous pulp, which is propelled from the apparatus housing by means of the steam or gas to a separation device which is similarly maintained under steam pressure and in which the steam is separated from the pulp (DE-A-2711567).
  • the raw material consists of chips from softwood or hardwood, bamboo, straw, bagasse, etc., which while undergoing fragmentation in the grinding apparatus may be either chemically treated or untreated.
  • the grinding apparatus comprises at least two grinding units, such as of the disc type having flat or conical grinding surfaces or a combination thereof, which rotate relatively to one another.
  • Enclosing the grinding unit in a pressure-proof housing enables the fragmentation or grinding of the material supplied in an already-heated condition to take place while the conditions of increased pressure and temperature which are favourable to the process are maintained.
  • the fibrous material produced from the fragmentation process is discharged from the pressurized grinding housing into a receiving device which is similarly maintained at overpressure which is equal to or somewhat lower than that maintained in the discharge zone of the grinding housing.
  • the receiving device in which the fibre pulp is separated from the steam accompanying it from the grinding device, is provided with an arrangement for discharging the fibrous material from the receiving device while maintaining the pressure of steam in the said receiving device, and without any major simultaneous discharge of steam with the fibrous material.
  • the steam separated in the receiving device has previously been used to preheat the material under atmospheric conditions to about 100°C before being fed under pressure-proof conditions into the preheater, which operates under pressure and which is connected directly to the grinding device.
  • the heating of the material is achieved by supplying live pressurized steam to the preheater, or, for fragmentation processes requiring greater amounts of electrical energy, by reintroducing steam from the inlet zone of the grinding device.
  • the purpose of the invention is, with application of grinding process of a known nature (cf. for example, SE-A-413.601, DE-A-2711567 and DE-A-2734832), to enable the grinding to take place at a favourably high pressure and temperature, and, at the same time, to enable re-cycling of the electrical or steam energy supplied for this purpose for preheating to the highest possible temperature of the material in the preheater.
  • This is achieved in that a higher pressure of steam or gas is generated in the grinding apparatus than in the preheater such that the steam proceeding from the grinding apparatus to the receiving device is conveyed further, by means of this higher pressure, to the preheater, there being responsible for preheating the material to over 100°.
  • the invention also comprises a device suitably- designed for application of the method.
  • the grinding process according to the invention can be carried out under the most favourable conditions of temperature and pressure, the steam energy generated during the grinding process or supplied as live steam is re-cycled in the preheater, reducing considerably the energy consumption required for carrying out the process.
  • the invention is particularly suitable for the manufacture of porous and hard fibreboards, in which the requirements are less exacting as regards whiteness in the fibre pulp.
  • fragmentation of the fibres, which results in the exposure of fibrils in such products is not required to be performed to such an extent, and the overall process becomes less energy-consuming in the grinding apparatus.
  • the pressure obtained from the outlet zone of the grinding device, with or without the addition of a lesser volume of fresh steam at the inlet zone of the separate grinding device can, by virtue of the turbo effect of the grinding device and the electrical energy supplied for the fragmentation, despite resistance and pressure losses in pipes, valves and regulating devices, be brought to a level such that the temperature and degree of processing for the material conveyed to the grinding device from the separate preheater is equal to, or deviates only to a negligible extent from that which has been attained previously by the addition of live steam at the preheating device directly (openly) connected to the grinding device.
  • the invention can also be said to be distinguished in that the raw material, before being conveyed by means of an, in principle, pressure- sensitive feeding device to a grinding device operating at increased pressure and temperature, is exposed to preheating to a temperature in excess of 100°C, but not in excess of the temperature maintained in the outlet zone of the grinding device, whereby the volume of steam required for such preheating is mainly conveyed from the outlet zone of the grinding device via a fibre separating device operating under pressure.
  • the reference numeral 70 designates a feed hopper for the raw material, for example wood chips, which are conveyed by a screw conveyor 11 into a preheater 75.
  • the material is compressed by the conveyor's screw 72 which is driven by a rotor 19, forming a steam-tight plug of the material.
  • the degree of compression is regulated by means of a pneumatically-operated counterpressure device 13 working in conjunction with a conical valve piece 74 which rests against the material plug being fed in.
  • the material plug With the passage of the conical valve piece, the material plug is broken up and the material drops down into the vertical preheater 75, in which a level of material is maintained which results in the desired dwell-time in the preheater vessel.
  • This material level is maintained in that a level regulator 16 acts upon the speed of the feed screw 12 by means of the driving device 19.
  • the material heated in the preheater vessel 75 is discharged at the bottom of the preheater by means of a conveyor 18 via a sealed conveyor 20 to the intake section of conveyor 22 which compresses the material, in order to bring about a fundamentally steam-tight conveying of the material from the preheater 75 to the grinding apparatus or disc refiner 24.
  • the conveyor 22 comprises, in the same way as the feed conveyor 11 in the embodiment example, a conical tube which tapers internally in the direction of the material flow, in which tube a screw 26 of the same shape operates.
  • a counterpressure device 27 Connected to the discharge side of the tube, if required for performing the process, is a counterpressure device 27, which may be a tubular connector in which flaps 28 are pivotally disposed for actuation by piston servomotors 30 so as to be swung into the inner bore 32 of the connector piece, which bore suitably forms a cylindrical extension of the discharge area of the screw feeder compressing the material, and thus when actuated reduces the throughflow area of this bore.
  • the degree of compression of the preheated material supplied to the grinding device 24 can be varied to the required extent, while the liquid (water) accompanying the material is simultaneously pressed out through perforations 31 in the compression tube into a funnel 35 connected by pressure-proof means to this tube, from which funnel the expelled water is removed via a pipe 90 into a tank 92, the overpressure in which is equal to or in the vicinity of the pressure of steam maintained in the supply tube 20 in that a conduit 94 connects the tank 92 with the supply tube 20.
  • the level of liquid in the tank 92 is monitored by a level-sensor 100 and a regulating device 98 controlled therefrom for a valve 97 provided in the discharge pipe 96 from the tank.
  • the grinding device or defibrator 24 comprises grinding disc which are disposed in a housing 36, in the embodiment example a stationary grinding disc 38 which is secured rigidly to the housing, and a grinding disc 40 which is mounted on a drive shaft 44, which is driven by a motor 42.
  • a pipe 70 suitably having a cylindrical bore, the free end of which is located closely adjacent to the rotating grinding disc 40. Furthermore, the pipe 70 is arranged eccentrically relative to the axis of rotation of the grinding disk in order to enhance the breaking-up of the highly compressed plug before the pulp material is introduced into the grinding space 48 between the grinding discs.
  • the plug may suitably be broken up by one or more vanes 72 on the disc 40 directly in front of the mouth of the pipe 70.
  • a pipe 74 water may be added to the materail when it is introduced into the grinding space 48, to compensate for the water expelled in the conveyor.
  • a conveyor of the type described here is known by virtue of Swedish Letters Patent 419.659.
  • a servo motor 45 is disposed between the motor 42 and the rotating grinding disc 40, in known manner, as shown, for example, in Swedish Patent 179,337, which servo motor, by means of an axially-displaceable non-rotatable piston, transmits the pressure of a hydraulic pressure medium through bearings to the rotating axle 44 in order to create the high pressure which is required for grinding the material as it passes radially outward in the grinding space 48 between the two facing grinding discs.
  • a drain pipe 50 is connected to grinding disc housing 36, through which pipe the fibrous material produced in the grinding apparatus is conveyed or propelled, at no loss of pressure, into a receiving tank 80, preferably of the cyclone type, in which fibre and steam are separated from one another.
  • the separated fibre is discharged from a rotating valve 82, in principle pressure-proof, to a receiver/conveyor device 84, wherein the moisture accompanying the fibrous material is vaporized and drawn off via a collecting hood 99 for possible re-use in any other part of the units in the installation which operates at atmospheric pressure.
  • the pressure level in the receiving tank 80 is regulated to the desired value by means of a differential regulator 85, which senses, by means of the sensor devices 54 and 55, via the pipes 81 and 83, the pressure both in the housing 36forthe _ grinding apparatus and in the receiving vessel 80, and automatically maintains a pressure differential between them, in the embodiment example normally 0.1-0.7 kg/cm 2 .
  • the steam pressure in the grinding housing may rise to 7-12 kg/cm 2 .
  • the temperature of the steam in the outlet from the grinding housing may be in the range of 115-125, to 150 ⁇ 170°C, to which temperature the material is therefore heated in the preheater, regardless of the inevitable pressure and temperature losses on the way to the preheater.
  • a valve 52 may be disposed in the pipe 50 between the grinding device 24 andsthe receiving vessel 80. By this valve, it is possible to regulate the speed of discharge of the fibrous material from the grinding housing, with regard to the overall length of the pipe 50.
  • the material supplied to the preheater 15 is heated by means of steam drawn off from the receiving vessel 80 via a pipe 86, which steam is at a level of pressure less than that maintained in the grinding housing, only with such loss of pressure required for conveying the treated fibrous material from the grinding housing 36, via the receiving vessel 80 to the preheater 15, normally 0.1­2.0 kg/cm 2.
  • the grinding disc housing 36 is supplied with live steam via pipes 120, 724 and 122 before, and, where required, after the passage of the ground material through the grinding space 48 between the grinding discs.
  • the purpose of the live steam is to maintain a pressure which is required for the process. This pressure is balanced by means of a _regulating device 110 which actuates a valve 112 located in the pipe 720 and which senses the pressure at the outlet to the grinding housing via a pipe 114.
  • the live steam supplied is conveyed, together with the steam generated by electrical energy supplied during the grinding process, to the preheater 15 with only a minimal loss of pressure and temperature.
  • Pipe 122 is only required to be switched in at extremely low levels of steam generation between the grinding discs in order then to be able to maintain the required pressure and preheating temperature in the vessel 15. In many cases, the pipe 122 may be dispensed with.
  • the arrangement with separate pressure vessels, i.e. preheater 15, grinding housing 36 and receiving vessel 80 thus makes it possible for the material input in the process to be heated in the preheater 15 to a temperature closely coinciding with the temperature which is maintained in the grinding disc housing, for example, at its inlet, using solely pressurized steam re-cycled from the process.
  • the material supplied to the grinding device 24 can, given this arrangement, be maintained at the same temperature as could be achieved in previous 'designs only by supplying live steam to the preheater, a fact implying substantial (40-80%) savings in heat energy for heat-processing the material.
  • Any surplus of supplied or generated steam is drawn off via a steam pipe 88, thereby allowing the steam pressure maintained in the system to be kept at a constant level, at the same time as it is possible to maintain the required minor pressure differential between the grinding housing 36 and the receiving vessel 80 at the desired level.
  • a valve 89 is disposed in the pipe 88, the setting of which valve can be monitored by the regulating device 85.

Claims (4)

1. Verfahren zur Herstellung einer Faserpulpe aus faserigem, lignozellulosehaltigem Rohmaterial, wobei der Stofftransport zu einem Vorwärmer (15) und anschliessend von letzterem zu einer Schleifvorrichtung (24) über eine dampfdichte Fördervorrichtung (11, 22) erfolgt, der Stoff im Vorwärmer (15) durch Dampf vorgewärmt und der vorgewärmte Stoff anschliessend unter erhöhtem Dampf- oder Gasdruck zwischen gegenüber einander in der Schleifvorrichtung (24) umlaufenden Schleifscheiben (38, 40) zu einer Faserpulpe geschliffen wird und vom Schleifgehäuse (26) durch den Dampf oder das Gas in eine Abscheidevorrichtung (80) gelangt, die unter ähnlichem Dampfdruck gehalten und in der Dampf von der Faserpulpe abgeschieden wird, dadurch gekennzeichnet, dass in der Schleifvorrichtung (24) ein höherer Dampf- oder Gasdruck als im Vorwärmer (15) erzeugt wird, so dass der von der Schleifvorrichtung (24) zur Abscheidevorrichtung (80) gelangende Dampf durch diesen höheren Druck weiter zum Vorwärmer (15) geleitet wird, wo er für das Vorwärmen des Stoffes auf über 100°C Verwendung findet.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass Direktdampf oder Gas in den Stoff im Gehäuse (36) der Schleifvorrichtung eingeleitet wird, bevor und möglicherweise auch nachdem der Stoff zwischen den Schleifscheiben (38, 40) durchgelaufen ist, in welchem Stadium der Direktdampf oder das Gas auf einem Druck und einer Temperatur gehalten wird, welche das Erhitzen des Stoffes auf über 100°C, vorzugsweise 125―150°C gewährleisten.
3. Vorrichtung zur Ausübung des Verfahrens nach Anspruch 1 zur Herstellung von Faserpulpe aus faserigem, lignozellulosehaltigem Rohmaterial, mit einem Vorwärmer (15), in den Rohmaterial über eine dampfdichte Fördervorrichtung (11) zusammen mit Dampf zum Vorwärmen des Stoffes eingeleitet wird, einer dampfdichten Fördervorrichtung (22) zum Einspeisen des vorgewärmten Materials vom Vorwärmer (15) zu einer Schleifvorrichtung (24), die im Verhältnis zueinander umlaufende, in einem Gehäuse (36) vorgesehene und mit einer nach aussen abgeschlossenen Abscheidevorrichtung (80) verbundene Schleifscheiben (38, 40) aufweist, in die die geschliffene Faserpulpe durch den Dampf im Schleifgehäuse (36) gelangt, wobei der Dampf in der Abscheidevorrichtung (80) vom Faserstoff getrennt wird, dadurch gekennzeichnet, dass die Abscheidevorrichtung (80) durch eine Rohrleitung (86) mit dem Vorwärmer (15) so verbunden ist, dass Dampf oder Gas mit höherem Druck und höherer Temperatur als in der Abscheidevorrichtung (80) und dem Vorwärmer (15) in der Schleifvorrichtung (24) erzeugt oder derselben zugeführt wird, wobei der Dampf oder das Gas über die Leitung (86) in den Vorwärmer (15) gelangt und dort für die Erhitzung des Stoffes auf über 100°C Verwendung findet.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Schleifvorrichtung (24) so ausgeführt ist, dass sie mit Direktdampf oder Gas mit solchem Ueberdruck und solcher Temperatur gespeist werden kann, dass sie wenigstens zum Teil für das Vorwärmen des Stoffes im Vorwärmer (15) auf die vorgesehene Temperatur sorgt, bevor der Stoff in die Schleifvorrichtung (24) eingetragen wird.
EP83900743A 1982-02-16 1983-02-15 Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial Expired EP0113353B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83900743T ATE20918T1 (de) 1982-02-16 1983-02-15 Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8200943 1982-02-16
SE8200943A SE429874B (sv) 1982-02-16 1982-02-16 Sett och anordning vid framstellning av fibermassa an lignocellulosahaltigt material

Publications (2)

Publication Number Publication Date
EP0113353A1 EP0113353A1 (de) 1984-07-18
EP0113353B1 true EP0113353B1 (de) 1986-07-23

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EP83900743A Expired EP0113353B1 (de) 1982-02-16 1983-02-15 Verfahren und vorrichtung zur herstellung einer faserpulpe aus faserigem lignocellulosematerial

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EP (1) EP0113353B1 (de)
JP (1) JPS59500175A (de)
DE (1) DE3364587D1 (de)
FI (1) FI75610C (de)
NO (1) NO833688L (de)
SE (1) SE429874B (de)
WO (1) WO1983002788A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
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AT514330A4 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen
AT514329B1 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen

Families Citing this family (15)

* 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
SE468015B (sv) * 1987-04-15 1992-10-19 Sunds Defibrator Ind Ab Anlaeggning foer framstaellning av fibermassa av lignocellulosamaterial
DE3903591A1 (de) * 1989-02-07 1990-08-09 Baehre & Greten Verfahren und vorrichtung zur herstellung von lignozellulosehaltigem faserstoff fuer die herstellung von faserplatten nach dem trockenverfahren
DE19712653C2 (de) 1997-03-26 2002-10-24 Voith Paper Fiber Systems Gmbh Verfahren und Vorrichtung zur Dispergierung eines Altpapierfaserstoffes
US6284098B1 (en) 1998-07-20 2001-09-04 Wwj, Llc Lignocellulose fiber filler for thermoplastic composite compositions
EP1070782A1 (de) * 1999-07-20 2001-01-24 Wwj, L.L.C. Lignocellulosefaser als Zusatz für thermoplastische Verbundzusammensetzungen
DE10102449C1 (de) 2001-01-19 2002-03-21 Voith Paper Patent Gmbh Vorrichtung zur Heiß-Dispergierung eines Papierfaserstoffes
DE102005012168A1 (de) * 2005-03-17 2006-09-28 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit Füllstoff
JP5759384B2 (ja) * 2009-01-13 2015-08-05 バイオガソル・エピエス プロセス反応器への物質の送込み方法および装置
AT510594B1 (de) * 2010-12-23 2012-05-15 Andritz Ag Maschf Refiner
DE102013017136B4 (de) * 2013-10-16 2017-09-07 Pallmann Maschinenfabrik Gmbh & Co. Kg Vorrichtung und Verfahren zum Reinigen von vorzerkleinertem, folienförmigem Aufgabegut
CN110820403A (zh) * 2018-08-08 2020-02-21 岳阳林纸股份有限公司 一种竹柳的prc-apmp制浆方法
EP3754106B1 (de) * 2019-06-20 2021-11-24 Cellwood Machinery AB Vorrichtung und verfahren zum dispergieren oder veredeln von organischem material wie cellulosefaser und organischem abfall
WO2021225498A1 (en) * 2020-05-07 2021-11-11 Valmet Ab Defibrator assembly, and method for monitoring a defibrator assembly
CN117245751A (zh) * 2023-10-16 2023-12-19 浙江顺威新材料有限公司 一种密度板原料处理设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE359332B (de) * 1971-12-20 1973-08-27 Reinhall Rolf
SE372299B (de) * 1973-04-27 1974-12-16 Reinhall Rolf
SE419659B (sv) * 1976-03-19 1981-08-17 Rolf Bertil Reinhall Sett och anordning for framstellning av fibermassa av fiberformigt lignocellulosahaltigt material
SE413601B (sv) * 1976-06-30 1980-06-09 American Defibrator Sett vid framstellning av fibermassa i en under angtryck staende malapparat samt anordning for genomforande av settet
SE413784B (sv) * 1976-08-06 1980-06-23 Isel Sa Sett och anordning for att utnyttja i defibreringszonen utvecklat verme for att minimera angforbrukningen vid framstellning av massa for fiberskivor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514330A4 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen
AT514330B1 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen
AT514329B1 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen
AT514329A4 (de) * 2013-08-01 2014-12-15 Andritz Ag Maschf Anlage und Verfahren zum Verarbeiten von Faserstoffen

Also Published As

Publication number Publication date
SE429874B (sv) 1983-10-03
DE3364587D1 (en) 1986-08-28
FI75610C (fi) 1988-07-11
EP0113353A1 (de) 1984-07-18
FI841041A0 (fi) 1984-03-14
SE8200943L (sv) 1983-08-17
WO1983002788A1 (en) 1983-08-18
JPS59500175A (ja) 1984-02-02
FI841041A (fi) 1984-03-14
FI75610B (fi) 1988-03-31
NO833688L (no) 1983-10-11

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