EP0113353B1 - Method and apparatus for producing fibre pulp from fibrous lignocellulose containing material - Google Patents
Method and apparatus for producing fibre pulp from fibrous lignocellulose containing material Download PDFInfo
- 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
- 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.)
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Classifications
-
- 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
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- 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.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Disintegrating Or Milling (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
Description
- 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.
- . Depending on the type of fibrous material produced, a varying amount of electrical or steam energy (50-2,000 kWh/ton) is required at a process temperature of 250°-100°C. It is generally true that the amount of energy required for fragmentation decreases with increasing temperatures of the material supplied to the grinding device. This is explained by the fact that the work required for fibre separation depends to what temperature the middle lamellae which unite and enclose the fibres are heated during the grinding process, especially during the latter's initial stage. The middle lamellae are largely composed of lignin, which during heating and rising temperatures gradually softens and is gradually transformed from a rigid to a relatively liquid condition. This fact is utilized in a number of pulp production processes to reduce the electrical energy required for this purpose, whereby the material is heated, prior to fragmentation, by means of a direct supply of live steam generated in the course of the fragmentation process.
- 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.
- At the same time as 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. Because of the relatively high temperature to which the fibrous material is exposed, 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. At the same time, 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. This means, again, that a supply of energy in the form of live steam is required in the grinding device in order to bring about the intended pressure distribution for the conveying of steam in the system and the high preheating temperature in the preheater. According to the invention, the expensive steam requirement is reduced to a minimum by utilizing entirely or in part the pressurized steam which can be recycled from the receiving device.
- It is understood that 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 device will be described in greater detail hereinafter, with reference to a preferred embodiment shown as an example in the attached drawings.
- Figure 1 is a more or less schematic side view, partly in section, showing equipment for carrying out the process according to the invention.
- Figure 2 shows the grinding apparatus which forms part of the equipment and a pressure-sensitive conveyor connected with it, drawn to an enlarged scale and in a vertical section.
- On the drawings, the
reference numeral 70 designates a feed hopper for the raw material, for example wood chips, which are conveyed by ascrew conveyor 11 into a preheater 75. At this stage, the material is compressed by the conveyor'sscrew 72 which is driven by arotor 19, forming a steam-tight plug of the material. The degree of compression is regulated by means of a pneumatically-operatedcounterpressure device 13 working in conjunction with aconical valve piece 74 which rests against the material plug being fed in. - 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 thefeed screw 12 by means of thedriving device 19. The material heated in the preheater vessel 75 is discharged at the bottom of the preheater by means of aconveyor 18 via a sealedconveyor 20 to the intake section ofconveyor 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 ordisc refiner 24. - The
conveyor 22 comprises, in the same way as thefeed conveyor 11 in the embodiment example, a conical tube which tapers internally in the direction of the material flow, in which tube ascrew 26 of the same shape operates. Connected to the discharge side of the tube, if required for performing the process, is acounterpressure device 27, which may be a tubular connector in whichflaps 28 are pivotally disposed for actuation bypiston servomotors 30 so as to be swung into theinner 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. - In this manner, 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 throughperforations 31 in the compression tube into afunnel 35 connected by pressure-proof means to this tube, from which funnel the expelled water is removed via apipe 90 into atank 92, the overpressure in which is equal to or in the vicinity of the pressure of steam maintained in thesupply tube 20 in that aconduit 94 connects thetank 92 with thesupply tube 20. The level of liquid in thetank 92 is monitored by a level-sensor 100 and a regulating device 98 controlled therefrom for avalve 97 provided in thedischarge pipe 96 from the tank. - The grinding device or
defibrator 24 comprises grinding disc which are disposed in ahousing 36, in the embodiment example astationary grinding disc 38 which is secured rigidly to the housing, and agrinding disc 40 which is mounted on adrive shaft 44, which is driven by amotor 42. - When the primary material has been compressed by
conveyor 22 and thecounterpressure device 27, it advances further through apipe 70, suitably having a cylindrical bore, the free end of which is located closely adjacent to the rotatinggrinding disc 40. Furthermore, thepipe 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 ormore vanes 72 on thedisc 40 directly in front of the mouth of thepipe 70. Through apipe 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 themotor 42 and the rotatinggrinding 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 rotatingaxle 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. Adrain pipe 50 is connected to grindingdisc housing 36, through which pipe the fibrous material produced in the grinding apparatus is conveyed or propelled, at no loss of pressure, into a receivingtank 80, preferably of the cyclone type, in which fibre and steam are separated from one another. In the embodiment example, the separated fibre is discharged from a rotatingvalve 82, in principle pressure-proof, to a receiver/conveyor device 84, wherein the moisture accompanying the fibrous material is vaporized and drawn off via acollecting 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 adifferential regulator 85, which senses, by means of thesensor devices pipes receiving vessel 80, and automatically maintains a pressure differential between them, in the embodiment example normally 0.1-0.7 kg/cm2. The steam pressure in the grinding housing may rise to 7-12 kg/cm2. 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 thepipe 50 between thegrinding device 24andsthe 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 thepipe 50. - The material supplied to the
preheater 15 is heated by means of steam drawn off from thereceiving vessel 80 via apipe 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 grindinghousing 36, via thereceiving vessel 80 to thepreheater 15, normally 0.12.0 kg/cm2. - The
grinding disc housing 36 is supplied with live steam viapipes _regulating device 110 which actuates avalve 112 located in the pipe 720 and which senses the pressure at the outlet to the grinding housing via apipe 114. The live steam supplied is conveyed, together with the steam generated by electrical energy supplied during the grinding process, to thepreheater 15 with only a minimal loss of pressure and temperature. - The distribution of the steam supply via the two
pipes valves vessel 15. In many cases, thepipe 122 may be dispensed with. - The arrangement with separate pressure vessels, i.e.
preheater 15, grindinghousing 36 and receivingvessel 80 thus makes it possible for the material input in the process to be heated in thepreheater 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. - By using the turbo effect of the
grinding device 40 together with the electrical energy supplied during the fragmentation process, it is possible to increase the pressure which is maintained at the outlet for the grindinghousing 36 to a level enabling the steam re-cycled to thepreheater 15 to be maintained at a pressure which is higher than the steam pressure maintained in the preheater. - Thus, 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 thegrinding housing 36 and thereceiving vessel 80 at the desired level. Avalve 89 is disposed in thepipe 88, the setting of which valve can be monitored by the regulatingdevice 85. - Obviously, the invention is not limited to the disclosed embodiments, but may find a variety of expressions within the scope of the claims. Thus, it is conceivable for a gas, for example air, to be introduced into the steam atmosphere in order to bring about the envisaged levels of pressure and temperature in the enclosed system.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT83900743T ATE20918T1 (en) | 1982-02-16 | 1983-02-15 | METHOD AND APPARATUS FOR MAKING A FIBER PULP FROM LIGNOCELLULOSIC FIBROUS MATERIAL. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8200943A SE429874B (en) | 1982-02-16 | 1982-02-16 | SET AND DEVICE FOR MANUFACTURING FIBER MASS AND LIGNOCELLULOSALLY MATERIAL |
SE8200943 | 1982-02-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0113353A1 EP0113353A1 (en) | 1984-07-18 |
EP0113353B1 true EP0113353B1 (en) | 1986-07-23 |
Family
ID=20346021
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83900743A Expired EP0113353B1 (en) | 1982-02-16 | 1983-02-15 | Method and apparatus for producing fibre pulp from fibrous lignocellulose containing material |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0113353B1 (en) |
JP (1) | JPS59500175A (en) |
DE (1) | DE3364587D1 (en) |
FI (1) | FI75610C (en) |
NO (1) | NO833688L (en) |
SE (1) | SE429874B (en) |
WO (1) | WO1983002788A1 (en) |
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SE468015B (en) * | 1987-04-15 | 1992-10-19 | Sunds Defibrator Ind Ab | APPLICATION FOR PREPARATION OF FIBER MASS OF LIGNOCELLULO MATERIAL |
DE3903591A1 (en) * | 1989-02-07 | 1990-08-09 | Baehre & Greten | METHOD AND DEVICE FOR THE PRODUCTION OF LIGNOCELLULOSE-CONTAINING FIBER FABRIC FOR THE PRODUCTION OF FIBERBOARDS AFTER THE DRYING PROCESS |
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Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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SE359332B (en) * | 1971-12-20 | 1973-08-27 | Reinhall Rolf | |
SE372299B (en) * | 1973-04-27 | 1974-12-16 | Reinhall Rolf | |
SE419659B (en) * | 1976-03-19 | 1981-08-17 | Rolf Bertil Reinhall | SET AND DEVICE FOR MANUFACTURING FIBER MASS OF FIBER LIGNOCELLULOSALLY MATERIAL |
SE413601B (en) * | 1976-06-30 | 1980-06-09 | American Defibrator | SET FOR MANUFACTURING THE FIBER MASS IN A UNDERPRESSED MALAWARE AND DEVICE FOR IMPLEMENTATION OF THE SET |
SE413784B (en) * | 1976-08-06 | 1980-06-23 | Isel Sa | SET AND DEVICE TO USE IN DEFIBRATION ZONE DEVELOPED HEAT TO MINIMIZE CONSUMPTION WHEN PREPARING MASS FOR FIBER DISC |
-
1982
- 1982-02-16 SE SE8200943A patent/SE429874B/en unknown
-
1983
- 1983-02-15 WO PCT/SE1983/000048 patent/WO1983002788A1/en active IP Right Grant
- 1983-02-15 JP JP83500775A patent/JPS59500175A/en active Pending
- 1983-02-15 DE DE8383900743T patent/DE3364587D1/en not_active Expired
- 1983-02-15 EP EP83900743A patent/EP0113353B1/en not_active Expired
- 1983-10-11 NO NO833688A patent/NO833688L/en unknown
-
1984
- 1984-03-14 FI FI841041A patent/FI75610C/en not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT514329B1 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
AT514329A4 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
AT514330B1 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
AT514330A4 (en) * | 2013-08-01 | 2014-12-15 | Andritz Ag Maschf | Plant and method for processing fibrous materials |
Also Published As
Publication number | Publication date |
---|---|
SE8200943L (en) | 1983-08-17 |
NO833688L (en) | 1983-10-11 |
WO1983002788A1 (en) | 1983-08-18 |
SE429874B (en) | 1983-10-03 |
FI841041A0 (en) | 1984-03-14 |
FI841041A (en) | 1984-03-14 |
JPS59500175A (en) | 1984-02-02 |
FI75610B (en) | 1988-03-31 |
EP0113353A1 (en) | 1984-07-18 |
FI75610C (en) | 1988-07-11 |
DE3364587D1 (en) | 1986-08-28 |
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