EP0609542B1 - Verfahren zur Herstellung einer Faserpulpe - Google Patents

Verfahren zur Herstellung einer Faserpulpe Download PDF

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Publication number
EP0609542B1
EP0609542B1 EP93120477A EP93120477A EP0609542B1 EP 0609542 B1 EP0609542 B1 EP 0609542B1 EP 93120477 A EP93120477 A EP 93120477A EP 93120477 A EP93120477 A EP 93120477A EP 0609542 B1 EP0609542 B1 EP 0609542B1
Authority
EP
European Patent Office
Prior art keywords
preheater
fiber
fiber material
level
fiber pulp
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
EP93120477A
Other languages
English (en)
French (fr)
Other versions
EP0609542A1 (de
Inventor
Inge Larsson
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 Industries AB
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 Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of EP0609542A1 publication Critical patent/EP0609542A1/de
Application granted granted Critical
Publication of EP0609542B1 publication Critical patent/EP0609542B1/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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • 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
    • D21D1/002—Control devices

Definitions

  • This invention relates to a method of producing fiber pulp from lignocellulose-containing fiber material.
  • the fiber material which normally consists of vegetable or wood parts, for example in the form of chips, first is fed into a preheater having the form of a container, in which the material is preheated by a heat medium, such as steam of atmospheric or higher pressure.
  • the material is discharged from the preheater to a refiner where the fiber pulp is produced by defibering the fiber material.
  • the defibration normally takes place in a refiner comprising two opposed refiner discs rotatable relative to each other, which between themselves form a refining gap.
  • the material is fed to the inner portion of the refining gap and defibered while being passed through the gap.
  • a device is, for example, known from US-A-4 283 252.
  • the preheating of the fiber material has the object to soften the material in order thereby to facilitate the subsequent defibering and to affect the properties of the fiber pulp as well as the energy consumption.
  • a change in the preheating time i.e. the dwell time in the preheater, changes the quality of the defibered pulp. It is normal in a defibering plant, that for various reasons the production is subjected to momentary variations. When at these production variations the level of the fiber material in the preheater is maintained, the dwell time of the material will be changed so that the fiber quality varies with the production variations.
  • the preheaters are provided with equipment rendering it possible only to maintain the material level in the preheaters constant.
  • the fiber material can be held in the preheater for a predetermined dwell time, irrespective of the fiber pulp production, by measuring the fiber pulp production and using it for controlling the level of the fiber material in the preheater.
  • the plant comprises a preheater 10,to the upper portion of which a feed device 11 with a feed screw 12 for fiber material, preferably wood chips, is connected.
  • the feed screw 12 is driven by a motor 13 with adjustable speed.
  • a discharge device 14 At the bottom of the preheater 10 a discharge device 14 is located which comprises one or several discharge screws 15 driven by a motor 16 with adjustable speed. Steam for heating the material in the preheater 10 is supplied through a conduit 17.
  • the discharge device 14 is connected to a refiner 18 comprising a stationary and a rotatable refiner disc 19,20, of which the rotatable refiner disc 20 is driven by a motor 21.
  • the fiber pulp defibered in the refiner is removed through a blow line 22 to subsequent processing steps.
  • a level indicator 23 is located on the outside of the preheater and runs in a guide 24 along the preheater.
  • the indicator 23 can be moved along the guide 24, for example by means of a chain arrangement 25 and a stepping motor 26.
  • the speed of the discharge screw 15 is a measure of the actual production of fiber pulp.
  • a certain speed thus, corresponds to a certain fiber pulp production, calculated as ton pulp per hour (ton/h).
  • the relation need not be linear.
  • the volume (m 3 ) of the fiber material contained in the preheater can be determined as a function of the level (m) of the material column in the preheater.
  • this function can be expressed as ton/m.
  • the level (H) expressed in meters (m) of the material column is obtained. It corresponds to the desired dwell time T at the actual production.
  • the desired level (H) will vary according to above.
  • the level can be controlled by adjusting the material supply to the preheater 10,preferably by varying the speed of the feed screw 12.
  • the control circuit shown in the Figure comprises a revolution counter 27,which indicates the speed of the discharge screw 15 and is connected to a controller 28, which on the basis of given data comprising the desired dwell time T automatically calculates the required material level (H) in the preheater 10.
  • This nominal value for the level is compared in a device 29 to the actual height position of the level indicator (23)(actual value).
  • a signal is transmitted to the stepping motor 26 for moving the level indicator 23, and a signal is transmitted to a speed controller 30 for changing the speed of the feed screw 12.
  • the material level can be raised or lowered until the actual nominal value for the level is obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Noodles (AREA)

Claims (4)

  1. Verfahren zum Herstellung von Faserpulpe aus Lignozellulose enthaltenden Fasermaterial, wobei das Fasermaterial zunächst in einen Vorwärmer (10) eingebracht und vorgewärmt wird und das vorgewärmte Material danach in einen Refiner (18) ausgetragen wird, indem die Faserpuple durch Aufschließen des Fasermaterials erzeugt wird,
    dadurch gekennzeichnet,
    daß das Fasermaterial im Vorwärmer (10) für eine vorbestimmte Verweilzeit unabhängig von der Faserpulpeproduktion durch Messen der Faserpulpeproduktion gehalten und zum Steuern des Niveaus des Fasermaterials im Vorwärmer (10) verwendet wird.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Austrag aus dem Vorwärmer (10) zum Refiner (18) mittels einer Austragsschnecke (15) stattfindet, deren Drehzahl ein Maß der Faserpulpeproduktion ist.
  3. Verfahren nach Anspruch 1 oder 2,
    dadurch gekennzeichnet,
    daß das Fasermaterial in den Vorwärmer (10) mittels einer Zuführschnecke (12) eingebracht wird, deren Drehzahl die Zufuhr des Fasermaterials steuert und dadurch das Niveau des Fasermaterials im Vorwärmer (10).
  4. Verfahren nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet,
    daß das Niveau des Fasermaterials im Vorwärmer (10) durch einen Niveauanzeiger (23) angezeigt wird, der mittels eines Schrittmotors (26) bewegt wird.
EP93120477A 1993-02-01 1993-12-18 Verfahren zur Herstellung einer Faserpulpe Expired - Lifetime EP0609542B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9300301A SE470575B (sv) 1993-02-01 1993-02-01 Sätt för framställning av fibermassa av lignocellulosahaltigt fibermaterial där fibermaterialet först inmatas i och passerar kontinuerligt igenom en förvärmare
SE9300301 1993-02-01

Publications (2)

Publication Number Publication Date
EP0609542A1 EP0609542A1 (de) 1994-08-10
EP0609542B1 true EP0609542B1 (de) 1996-06-26

Family

ID=20388726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120477A Expired - Lifetime EP0609542B1 (de) 1993-02-01 1993-12-18 Verfahren zur Herstellung einer Faserpulpe

Country Status (6)

Country Link
EP (1) EP0609542B1 (de)
AT (1) ATE139813T1 (de)
DE (1) DE69303358T2 (de)
DK (1) DK0609542T3 (de)
ES (1) ES2090832T3 (de)
SE (1) SE470575B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1157016A (zh) * 1995-06-12 1997-08-13 安德里兹·斯普劳特-鲍尔有限公司 低停留时间、高温和高速的木屑研磨
US6899791B2 (en) 1997-08-08 2005-05-31 Andritz Inc. Method of pretreating lignocellulose fiber-containing material in a pulp refining process
EP4146859A4 (de) * 2020-05-07 2024-06-19 Valmet Ab Zerfasereranordnung und verfahren zur überwachung einer zerfasereranordnung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419659B (sv) * 1976-03-19 1981-08-17 Rolf Bertil Reinhall Sett och anordning for framstellning av fibermassa av fiberformigt lignocellulosahaltigt material
FI62149C (fi) * 1979-01-12 1984-03-20 Yhtyneet Paperitehtaat Oy Foerfarande foer framstaellning av varmslipmassa

Also Published As

Publication number Publication date
SE9300301L (sv) 1994-08-02
ATE139813T1 (de) 1996-07-15
SE9300301D0 (sv) 1993-02-01
ES2090832T3 (es) 1996-10-16
SE470575B (sv) 1994-09-19
DE69303358D1 (de) 1996-08-01
DE69303358T2 (de) 1996-10-31
DK0609542T3 (da) 1996-08-05
EP0609542A1 (de) 1994-08-10

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