EP0493422B1 - Pfropfenschraubenzuführung - Google Patents

Pfropfenschraubenzuführung Download PDF

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Publication number
EP0493422B1
EP0493422B1 EP19900913446 EP90913446A EP0493422B1 EP 0493422 B1 EP0493422 B1 EP 0493422B1 EP 19900913446 EP19900913446 EP 19900913446 EP 90913446 A EP90913446 A EP 90913446A EP 0493422 B1 EP0493422 B1 EP 0493422B1
Authority
EP
European Patent Office
Prior art keywords
screw
plug screw
force feed
screw feeder
plug
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.)
Expired - Lifetime
Application number
EP19900913446
Other languages
English (en)
French (fr)
Other versions
EP0493422A1 (de
Inventor
John Eccleston
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.)
Kvaerner Hymac Inc
Original Assignee
Kvaerner Hymac Inc
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 Kvaerner Hymac Inc filed Critical Kvaerner Hymac Inc
Priority to AT90913446T priority Critical patent/ATE98712T1/de
Publication of EP0493422A1 publication Critical patent/EP0493422A1/de
Application granted granted Critical
Publication of EP0493422B1 publication Critical patent/EP0493422B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/22—Disintegrating in mills in magazine-type machines with screw feed

Definitions

  • This invention relates to a method for improving the performance of compression type feeders for bulk materials such as wood chips as for example known from GB-A-889928.
  • the pulp and paper industry utilizes compression devices (plug screw feeders) which are based on the principle of a screw rotating inside a cylindrical or conical cage, where the volume available at the inlet of the screw is greater than the volume available at the discharge.
  • the cage can be equipped with holes, usually conically drilled, or slots or bars arranged in such a fashion as to provide drainage of liquor squeezed from material being compressed.
  • the cage is usually equipped with anti-rotation devices such as bars, pins or slots to prevent the compressed material from turning with the screw.
  • United States Patent 2,943,012 entitled “Method and Apparatus for Fiberizing” discloses a plug screw feeder assembly in which wood chips are compressed to remove excess water and the wood chips are further compressed into a plug. Mechanical force is applied at an angle to said plug for the mechanical tearing off of layers from the plug. Pressure is built up in the press barrel by restricting the discharge at the opening by an adjustable choke device and by progressively increasing the diameter of the shaft while maintaining the barrel diameter uniform.
  • pressafiner Another device called a pressafiner and a similar device called a French Oil Press have similar applications and usually have theoretical compression ratios of 6:1 or higher.
  • United States Patent 2,975,096 entitled “Impregnation of Wood Chips” discloses a plug screw feeder in which fluid is pressed from the wood chips in the first part of the plug screw feeder, impregnating liquor is added to the high consistency wood chips in the next part of the plug screw feeder.
  • the apparatus also discloses the use of conical formations on the rotating shaft. The exterior of the conical formations is in close proximity to the inside of the chamber and the compressed material provides plug seals at the restricted points in the chamber. While Figure 1 of the patent discloses screw feeders, the screw feeders are not designed to force feed the wood chips into the chamber of the plug screw feeder.
  • the resulting fibres exhibit low wet web strengths and increased energy is required to reach a given freeness.
  • wet web properties are enhanced and energy required to achieve a given freeness is reduced.
  • CTMP chemical thermal mechanical pulp
  • the various uses of plug screw feeders involve a number of mechanisms for creating pressure between the chamber and the shaft bearing flights.
  • the inner diameter of the chamber may be cylindrical, conical, or may contain restricted areas. All of these features together with variations in the diameter of the shaft or diameters of the flutes on the shaft can produce changes in the pressure exerted on the wood chips or other material being treated in the plug screw feeder.
  • the chamber of the plug screw feeder may be comprised of bars, screens or be solid depending upon whether the plug screw feeder is being used to drive off excess water or being used to refine wood chips or both remove excess fluid and refine.
  • the pressure and throughput is controlled by the voids if any in the chamber, the restrictions in the chamber, the shaping of the shaft or flutes and the torque applied to the screw feeder. The applicant has found that in many applications improved efficiency and throughput of a plug screw feeder can be achieved by feeding wood chips or other materials under pressure into the plug screw feeder.
  • the theoretical compression ratio of a plug screw feeder is the volume of the first enclosed pocket or flight spacing in the inlet zone, divided by the volume of the last enclosed pocket or flight spacing in the discharge zone.
  • Wood chips being a non-homogeneous substance have a bulk packing density approximately 1/2 that of solid wood.
  • the bulk density of chips is approximately 12 lbs/ft (192.2 kg/m3).
  • Production tests show that a typical plug screw feeder will have 60% of its theoretical capacity when a packing density of 12 lbs/ft (192.2 kg/m3) is used in the calculation.
  • the compression device for bulk material such as wood chips of this invention overcomes the limitations of inadequate and/or unpredictable inlet filling associated with such compression devices now in use.
  • the varied force feed screw to the inlet of the compression device works like a "supercharger" by forcing material into the inlet section of the compression device, thus providing an increased and uniform packing density in the inlet.
  • the fully packed inlet also prevents back flow of chips from the compression cone.
  • the full compression of the screw is then available to work on the material thus increasing the effective compression ratio.
  • One embodiment of the invention relates to a compression device for bulk material such as wood chips, comprising an inlet, a screw operating within a cylindrical or conical cage and an outlet wherein the volume of space available at the inlet of the compression device is greater than the volume of space available at the outlet, and the improvement wherein means is provided to feed bulk materials under pressure into the inlet of the compression device.
  • the means for feeding the bulk material under pressure into the inlet of the invention is variable and the feeding may be at variable pressures.
  • variable speed force feed screw is used to control the inlet pressure.
  • Another embodiment of the invention relates to a method of compressing bulk material such as wood chips comprising feeding the materials to be compressed under pressure into the inlet of the compression device, operating a screw within a cylindrical or conical cage, having a greater volume at the inlet than at the outlet.
  • the means for feeding the compressible material is variable to provide variable feed pressures to the compression device.
  • variable speed control feed screw is used to control the inlet pressure of the compressible material to the compressor.
  • the force feed screw has a variable speed drive. By adjusting the torque applied to the force feed screw, the packing density can be affected, giving an ability to adjust the effective compression ratio of the compression feeder to meet the requirements of the process.
  • Figure 1 is a schematic drawing of a plug screw feeder.
  • the plug screw feeder 1 is comprised of a variable power source 2, power drive shaft 3, transmission 4, screw drive shaft 5 and screw 6 which are all interconnected.
  • the screw 6 is enclosed within compression cone or cylinder 7.
  • Compression cone or cylinder 7 includes screen plates 8 through which liquid is drained during compression and thickening of the bulk material
  • the plug screw feeder 1 has an inlet housing 9 and an outlet housing 10.
  • the inlet housing 9 is comprised of a force feed screw 11 inside force feed cylinder 12. Force feed cylinder 12 rests below surge bin 13. Force feed screw 11 is attached by drive shaft 14 to variable feed screw power source 15.
  • the outlet housing 10 includes discharge chamber 16, discharge outlet 17 and fluid or blowback damper 18.
  • the plug screw 6 is comprised of a series of flights or pockets commencing at 19 proximate the inlet housing 9 and decreasing in volume until the flight or pocket 20 of least volume proximate the outlet housing 10.
  • a series of antirotation pins 21 are mounted in the wall of compression cone or cylinder 7.
  • the compressible material is loaded in the surge bin 13 and the force feed cylinder 12.
  • the power source 2 is activated and the plug screw 1 begins rotating and compressing the compressible material in compression cone or cylinder 7.
  • the variable feed screw power source is turned on and forces feed screw 11 continues to force the compressible material into the largest volume flight pocket 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Screw Conveyors (AREA)
  • Disintegrating Or Milling (AREA)
  • Refuse Collection And Transfer (AREA)

Claims (2)

  1. Pfropfenschraubenzuführung (1) zur Verwendung bei der Mazeration von Holzschnipseln zum Erhalten eines gewünschten Grades der Verlagerung der Fasern, mit einer Einrichtung zum Verbessern des Kompressionsverhältnisses zwischen dem realen und dem theoretischen Kompressionsverhältnis, mit einer Pfropfenschraubenzuführung (1), die ein Einlaßgehäuse (9) und ein Auslaßgehäuse (10) aufweist, einer Schnecke mit variabler Drehzahl (6), die in der Pfropfenschraubenzuführung (1) angeordnet ist, einem Zwangsaufgabezylinder (12), der mit dem Einlaßgehäuse (9) der Pfropfenschraubenzuführung verbunden ist, einer Zwangsförderschnecke (11) mit variabler Drehzahl, die im Zwangsförderzylinder (12) angeordnet ist, einer Pfropfenschrauben-Antriebsquelle (2) mit variabler Drehzahl, die die Drehzahl der Umdrehung der Schnecke (6) mit variabler Drehzahl steuert, einer Förderschnecken-Antriebsquelle (15) mit variabler Drehzahl, die die Drehzahl der Zwangsförderschnecke (11) steuert,
       dadurch gekennzeichnet, daß die Einstellung der Drehzahlen der Schnecke (6) mit variabler Drehzahl und der Zwangsförderschnecke (11) benutzt wird, um das gewünschte Ausmaß der Faserverlagerung zu erhalten.
  2. Verfahren zum Steuern der Mazeration von Holzschnipseln in einer Pfropfenschraubenzuführung (1), die ein Einlaßgehäuse (9) und ein Auslaßgehäuse (10), eine Schnecke (6) mit variabler Drehzahl, die in der Pfropfenschraubenzuführung (1) angeordnet ist, einen Zwangsförderzylinder (12), der mit dem Einlaßgehäuse (9) der Pfropfenschraubenzuführung verbunden ist, eine Zwangsförderschnecke (11) mit variabler Drehzahl, die im Zwangsförderzylinder (12) angeordnet ist, aufweist, wobei das Verfahren die Schritte umfaßt, Holzschnipsel in den Zwangsförderzylinder (12) einzubringen, der mit dem Einlaßgehäuse (9) der Pfropfenschraubenzuführung verbunden ist,
       dadurch gekennzeichnet, daß die Einstellung der Drehzahl der Schnecke (6) mit variabler Drehzahl in der Pfropfenschraubenzuführung (1) und der Drehzahl der Zwangsförderschnecke (11) mit variabler Drehzahl, die im Zwangsförderzylinder (12) angeordnet ist, verwendet wird, um das gewünschte Ausmaß der Faserverlagerung in den Holzschnipseln zu erreichen.
EP19900913446 1989-09-19 1990-09-17 Pfropfenschraubenzuführung Expired - Lifetime EP0493422B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90913446T ATE98712T1 (de) 1989-09-19 1990-09-17 Pfropfenschraubenzufuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000612010A CA1309962C (en) 1989-09-19 1989-09-19 Plug screw feeder
CA612010 1989-09-19

Publications (2)

Publication Number Publication Date
EP0493422A1 EP0493422A1 (de) 1992-07-08
EP0493422B1 true EP0493422B1 (de) 1993-12-15

Family

ID=4140627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900913446 Expired - Lifetime EP0493422B1 (de) 1989-09-19 1990-09-17 Pfropfenschraubenzuführung

Country Status (9)

Country Link
EP (1) EP0493422B1 (de)
JP (1) JPH05500086A (de)
AU (1) AU642160B2 (de)
CA (1) CA1309962C (de)
DE (1) DE69005311T2 (de)
ES (1) ES2047340T3 (de)
FI (1) FI97732C (de)
NO (1) NO180546C (de)
WO (1) WO1991004371A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021104691A1 (de) 2019-11-25 2021-06-03 Andritz Ag Vorrichtung und verfahren zur mazeration eines foerderguts

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9503505A (pt) * 1995-07-31 1997-09-30 Dedini S A Administracao E Par Dispositivo de alimentação para digestores de alta pressão
US5756098A (en) * 1995-12-12 1998-05-26 The University Of Montana Methods for the extraction of phytochemicals from fibrous plants in the absence of solvent
EP2336344A1 (de) 2009-12-21 2011-06-22 Sekab E-Technology AB Vorbehandlung von Zellulose haltigem Material
SE537989C2 (sv) * 2014-05-22 2016-01-19 Valmet Oy Arrangemang för att mata finfördelat material med användningav en pluggskruvmatare
SE543151C2 (en) * 2018-07-02 2020-10-13 Valmet Oy Feeding system and method for feeding comminuted cellulosic material to a high-pressure treatment zone
SE543327C2 (en) * 2018-10-01 2020-12-01 Valmet Oy Method for feeding lignocellulosic biomass material
EP3666859B1 (de) * 2018-12-12 2022-03-02 Valmet Ab Geschwindigkeitsgesteuerter stopfschneckenförderer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB889928A (en) * 1959-03-03 1962-02-21 Bowater Board Company Improvements in and relating to the production of fibres from lignocellulosic material
DE2728422A1 (de) * 1977-06-24 1979-01-04 Projektierung Chem Verfahrenst Verfahren und vorrichtung zur aufarbeitung von rohstoffen mit faserigen bestandteilen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021104691A1 (de) 2019-11-25 2021-06-03 Andritz Ag Vorrichtung und verfahren zur mazeration eines foerderguts

Also Published As

Publication number Publication date
NO180546B (no) 1997-01-27
NO180546C (no) 1997-05-14
FI97732C (fi) 1997-02-10
DE69005311T2 (de) 1994-05-19
CA1309962C (en) 1992-11-10
JPH05500086A (ja) 1993-01-14
NO920935L (no) 1992-03-10
FI921162A0 (fi) 1992-03-18
AU642160B2 (en) 1993-10-14
EP0493422A1 (de) 1992-07-08
WO1991004371A1 (en) 1991-04-04
DE69005311D1 (de) 1994-01-27
ES2047340T3 (es) 1994-02-16
FI97732B (fi) 1996-10-31
NO920935D0 (no) 1992-03-10
AU6331590A (en) 1991-04-18
FI921162A (fi) 1992-03-18

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