SE470575B - Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater - Google Patents

Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater

Info

Publication number
SE470575B
SE470575B SE9300301A SE9300301A SE470575B SE 470575 B SE470575 B SE 470575B SE 9300301 A SE9300301 A SE 9300301A SE 9300301 A SE9300301 A SE 9300301A SE 470575 B SE470575 B SE 470575B
Authority
SE
Sweden
Prior art keywords
preheater
fibrous material
fibrous
level
fed
Prior art date
Application number
SE9300301A
Other languages
Swedish (sv)
Other versions
SE9300301L (en
SE9300301D0 (en
Inventor
Inge Larsson
Original Assignee
Sunds Defibrator Ind 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 Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9300301A priority Critical patent/SE470575B/en
Publication of SE9300301D0 publication Critical patent/SE9300301D0/en
Priority to DK93120477.0T priority patent/DK0609542T3/en
Priority to EP93120477A priority patent/EP0609542B1/en
Priority to AT93120477T priority patent/ATE139813T1/en
Priority to DE69303358T priority patent/DE69303358T2/en
Priority to ES93120477T priority patent/ES2090832T3/en
Publication of SE9300301L publication Critical patent/SE9300301L/en
Publication of SE470575B publication Critical patent/SE470575B/en

Links

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

Landscapes

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

Abstract

A method of producing fiber pulp from lignocellulose-containing fiber material, where the fiber material first is fed into a preheater (10) and preheated and the preheated material thereafter is discharged to a refiner (18) where the fiber pulp is produced by defibration of the fiber material. The fiber material is held in the preheater (10) 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 (10). <IMAGE>

Description

470 575 z en motor 13 med reglerbart varvtal. I förvärmarens 10 botten är en utmatningsanordning 14 placerad, vilken innefattar en eller fler utmatarskruvar 15 som drivs av en motor 16 med reglerbart varvtal. Genom en ledning 17 tillföres ånga för uppvärmning av materialet i förvärmaren 10. 470 575 z an engine 13 with adjustable speed. At the bottom of the preheater 10 a discharge device 14 is placed, which comprises one or more discharge screws 15 which are driven by a motor 16 with adjustable speed. Steam is supplied through a line 17 for heating the material in the preheater 10.

Utmatningsanordningen 14 är ansluten till en malapparat 18 som innefattar en stationär och ett roterbart malorgan 19, 20, varvid det roterbara malorganet 20 drivs av en motor 21. Den i malapparaten defibrerade fibermassan bortföres genom en blås- ledning 22 till efterföljande behandlingssteg.The discharge device 14 is connected to a grinding apparatus 18 which comprises a stationary and a rotatable grinding means 19, 20, the rotatable grinding means 20 being driven by a motor 21. The fibrous mass defibrated in the grinding apparatus is removed through a blow line 22 to subsequent processing steps.

För bestämning av materialnivån i förvärmaren 10 är en nivågivare 23 anordnad. Denna givare 23 är placerad på utsidan av förvärmaren och löper på en styrning 24 längs förvärmaren, varvid nivågivaren 23 kan förflyttas utefter styrningen 24, exempelvis med hjälp av ett kedjearrangemang 25 och en stegmotor 26.To determine the material level in the preheater 10, a level sensor 23 is provided. This sensor 23 is located on the outside of the preheater and runs on a guide 24 along the preheater, whereby the level sensor 23 can be moved along the guide 24, for example by means of a chain arrangement 25 and a stepper motor 26.

Enligt den visade utföringsformen utgör varvtalet på utmatarskruven 15 ett mått på aktuell produktion av fibermassa.According to the embodiment shown, the speed of the discharge screw 15 constitutes a measure of the actual production of fibrous pulp.

Ett visst varvtal motsvarar således en viss fibermassaproduktion räknat som ton massa per timme (ton/h). Sambandet behöver dock inte vara linjärt. _ Genom att ta hänsyn till förvärmarens form, dvs hur tvärsnittsarean varierar i höjdled, kan volymen (nf) av förvärma- rens innehåll av fibermaterial bestämmas som en funktion av materialpelarens nivå (m) i förvärmaren. Tar man även hänsyn till densiteten hos aktuell materialråvara kan denna funktion uttryckas i ton/m.A certain speed thus corresponds to a certain fiber mass production calculated as tonnes of pulp per hour (tonnes / h). However, the relationship does not have to be linear. By taking into account the shape of the preheater, ie how the cross-sectional area varies in height, the volume (nf) of the preheater's content of fibrous material can be determined as a function of the level (m) of the material column in the preheater. If the density of the current material raw material is also taken into account, this function can be expressed in tonnes / m.

Om man nu dividerar fiberproduktionen uttryckt i ton/h med förvärmarens materialinnehåll uttryckt i ton/m samt multi- plicerar denna kvot med den önskade uppehållstiden T uttryckt i timmar (h) erhåller man den nivå H uttryckt i meter (m) på materialpelaren som motsvarar den önskade uppehållstiden T vid den aktuella produktionen.If you now divide the fiber production expressed in tonnes / h by the material content of the preheater expressed in tonnes / m and multiply this ratio by the desired residence time T expressed in hours (h), you get the level H expressed in meters (m) on the material column that corresponds to the desired residence time T at the current production.

Vid produktionsförändringar, dvs ändringar av varvtalet hos utmatarskruven 15, kommer den eftersträvade nivån H att variera enligt ovan. Nivån kan regleras genom att materialtill- förseln till förvärmaren 10 regleras, lämpligen genom att varv- talet hos inmatarskruven 12 varieras. fl/ 3 4370 575 Den i figuren visade reglerkretsen innefattar en varv- talsmätare 27 som indikerar varvtalet hos utmatarskruven 15 och som är ansluten till en regulator 28 vilken utifrån givna data innefattande den önskade uppehållstiden T automatiskt räknar fram erforderlig materialnivå (H) i förvärmaren 10. Detta börvärde för nivån jämförs i en anordning 29 med nivågivarens 23 aktuella höjdläge (ärvärde). Vid avvikelse mellan börvärdet och ärvärdet går dels signal till stegmotorn 26 för förflyttning av nivågivaren 23 och dels signal till en varvtalsregulator 30 för ändring av varvtalet hos inmatarskruven 12. Genom ökning eller minskning av detta varvtal kan materialnivån höjas eller sänkas tills det aktuella börvärdet för nivån uppnåtts.In the event of production changes, ie changes in the speed of the discharge screw 15, the target level H will vary as above. The level can be regulated by regulating the material supply to the preheater 10, suitably by varying the speed of the feed screw 12. The control circuit shown in the figure comprises a speedometer 27 which indicates the speed of the feed screw 15 and which is connected to a regulator 28 which, based on data given including the desired residence time T, automatically calculates the required material level (H) in the preheater 10. This setpoint for the level is compared in a device 29 with the current height position (actual value) of the level sensor 23. In the event of a deviation between the setpoint and the actual value, a signal goes to the stepper motor 26 for moving the level sensor 23 and a signal to a speed controller 30 for changing the speed of the feed screw 12. By increasing or decreasing this speed, the material level can be increased or decreased until the current setpoint for the level achieved.

Uppfinningen är givetvis inte begränsad till det be- skrivna utförandet utan kan varieras inom ramen för uppfinnings- tanken.The invention is of course not limited to the described embodiment but can be varied within the scope of the inventive idea.

Claims (4)

47Ü 575 4 Patentkrav47Ü 575 4 Patentkrav 1. Sätt för framställning av fibermassa av lignocellulosa- haltigt fibermaterial där fibermaterialet först inmatas och passerar kontinuerligt igenom en förvärmare (10) och förvärms samt att det förvärmda materialet därefter utmatas till en malapparat (18) där fibermassan produceras genom defibrering av fibermaterialet, k ä n n e t e c k n a t av att fibermaterialet hålls i förvärmaren (10) under en förutbestämd uppehållstid oberoende av mängden producerad fibermassa per tidsenhet genom att mängden producerad fibermassa per tidsenhet uppmätes och utnyttjas för reglering av fibermaterialets nivå i förvärmaren (10).A method for producing fibrous pulp from lignocellulosic fibrous material where the fibrous material is first fed and passes continuously through a preheater (10) and preheated and the preheated material is then discharged to a milling apparatus (18) where the fibrous pulp is produced by defibrating the fibrous material, k ä characterized in that the fibrous material is kept in the preheater (10) for a predetermined residence time independent of the amount of fibrous mass produced per unit time by measuring the amount of fibrous mass produced per unit of time and using it to control the level of fibrous material in the preheater (10). 2. Sätt enligt kravet 1, k ä n n e t e c k n a t av att utmatningen ur förvärmaren (10) till malapparaten (18) sker medelst en utmatarskruv (15) vars varvtal utgör ett mått på mängden producerad fibermassa per tidsenhet.2. A method according to claim 1, characterized in that the discharge from the preheater (10) to the grinding apparatus (18) takes place by means of an discharge screw (15) whose speed constitutes a measure of the amount of fiber mass produced per unit time. 3. Sätt enligt kravet 1 eller 2, k ä n n e t e c k n a t av att fibermaterialet inmatas i förvärmaren (10) medelst en inmatarskruv (12) vars varvtal reglerar tillförseln av fiber- material och därmed fibermaterialets nivå i förvärmaren (10).3. A method according to claim 1 or 2, characterized in that the fibrous material is fed into the preheater (10) by means of a feed screw (12) whose speed regulates the supply of fibrous material and thus the level of the fibrous material in the preheater (10). 4. Sätt enligt något av föregående krav, k ä n n e - t e c k n a t av att fibermaterialets nivå i förvärmaren (10) indikeras av en nivågivare (23) som förflyttas medelst en steg- motor (26).4. A method according to any one of the preceding claims, characterized in that the level of the fibrous material in the preheater (10) is indicated by a level sensor (23) which is moved by means of a stepper motor (26).
SE9300301A 1993-02-01 1993-02-01 Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater SE470575B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9300301A SE470575B (en) 1993-02-01 1993-02-01 Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater
DK93120477.0T DK0609542T3 (en) 1993-02-01 1993-12-18 Method of making fiber pulp
EP93120477A EP0609542B1 (en) 1993-02-01 1993-12-18 Method of producing fiber pulp
AT93120477T ATE139813T1 (en) 1993-02-01 1993-12-18 METHOD FOR PRODUCING A FIBER PULP
DE69303358T DE69303358T2 (en) 1993-02-01 1993-12-18 Process for the production of a fiber pulp
ES93120477T ES2090832T3 (en) 1993-02-01 1993-12-18 METHOD FOR PRODUCING FIBER PASTA.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9300301A SE470575B (en) 1993-02-01 1993-02-01 Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater

Publications (3)

Publication Number Publication Date
SE9300301D0 SE9300301D0 (en) 1993-02-01
SE9300301L SE9300301L (en) 1994-08-02
SE470575B true SE470575B (en) 1994-09-19

Family

ID=20388726

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9300301A SE470575B (en) 1993-02-01 1993-02-01 Methods for preparing fibrous pulp of lignocellulosic fibrous material where the fibrous material is first fed into and continuously passed through a preheater

Country Status (6)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6899791B2 (en) 1997-08-08 2005-05-31 Andritz Inc. Method of pretreating lignocellulose fiber-containing material in a pulp refining process
NZ311356A (en) * 1995-06-12 1997-05-26 Sprout Bauer Inc Andritz Method of refining wood chips with low residence time and high temperature
EP4146859A4 (en) * 2020-05-07 2024-06-19 Valmet Ab Defibrator assembly, and method for monitoring a defibrator assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419659B (en) * 1976-03-19 1981-08-17 Rolf Bertil Reinhall SET AND DEVICE FOR MANUFACTURING FIBER MASS OF FIBER LIGNOCELLULOSALLY MATERIAL
FI62149C (en) * 1979-01-12 1984-03-20 Yhtyneet Paperitehtaat Oy FOERFARANDE FOER FRAMSTAELLNING AV VARMSLIPMASSA

Also Published As

Publication number Publication date
DK0609542T3 (en) 1996-08-05
EP0609542B1 (en) 1996-06-26
ATE139813T1 (en) 1996-07-15
SE9300301L (en) 1994-08-02
DE69303358D1 (en) 1996-08-01
SE9300301D0 (en) 1993-02-01
ES2090832T3 (en) 1996-10-16
DE69303358T2 (en) 1996-10-31
EP0609542A1 (en) 1994-08-10

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