US3921918A - Mechanical refining of fiber material including steam recycle - Google Patents

Mechanical refining of fiber material including steam recycle Download PDF

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Publication number
US3921918A
US3921918A US489138A US48913874A US3921918A US 3921918 A US3921918 A US 3921918A US 489138 A US489138 A US 489138A US 48913874 A US48913874 A US 48913874A US 3921918 A US3921918 A US 3921918A
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United States
Prior art keywords
steam
refining
preheater
space
pressure
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Expired - Lifetime
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US489138A
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English (en)
Inventor
Viking Per Peterson
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SCA Development AB
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SCA Development AB
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Publication date
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Publication of US3921918A publication Critical patent/US3921918A/en
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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

  • the entire defibering and refining process to the finished product can in this way be carried out in a single step.
  • the refining may also be carried out in several, preferably two steps, but the portion of the total energy amount consumed in the first step immediately after preheating would still be so great that the steam developed during the process would cause serious disturbances, if the steam would be forced to pass out in its entirety through the gap between the beating discs, as is the case with conventional systems.
  • the preheater vessel is not in direct connection with the refiner, and the preheating of the fibre material usually takes place within the temperature range ll-l70C, the pressure during the preheating being higher than the pressure which prevails immediately after the preheater vessel and in the central space between the grinding discs, and the steam developed during the refining being entirely or partially led away by special means from said space. It was found suitable to carry out the refining at a steam pressure of 0.2-0.6 kg/cm corresponding to a temperature of about l-l C, within which range the refining energy consumption seems to be at a minimum.
  • One main object of the present invention is to establish a simplified system for producing mechanical pulps of high quality while maintaining the advantages involved with the refining of preheated fibre material, in such a manner, that a large part of the steam developed during the refining can be evacuated rearwards through the system from the space between the grinding discs, but at the same time this steam is utilized for preheating the fibre material in order to save energy.
  • the fibre material is exposed to heating with steam to ll0l 15C and to a pressure increased corresponding to the temperature. The temperature and pressure are maintained equal during the refining.
  • the steam developed during the refining is led away from the space between the grinding discs through the feed screw of the refiner or through another suitable device to the preheater vessel, which is in direct connection with the refiner. It is hereby possible, if desired, to consume in a single step the entire energy amount required for the process without giving rise to process disturbances. Contrary to conventional systems, the steam developed by the refiner is utilized in this way for heating the fibre material. No steam generated in a different way need be supplied to the system, so that substantial energy can be saved compared with conventional systems.
  • the refiner produces more steam than can be utilized for heating the fibre material, and the excess is removed from the preheater vessel through a pressure control valve. The energy savings thereby possible correspond to about -300 kWh/t of produced mechanical pulp, or 10-20 of the total refining energy.
  • the refining may, if desired, be carried out with the housing enclosing the beating discs being pressureless and open.
  • the embodiment according to the FIGURE comprises a rotary vane feeder l for feeding the fibre material into a preheater vessel 2.
  • the fibre material has a high concentration and is metered to a correct amount by means of a metering device (not shown) arranged before the rotary vane feeder l.
  • the fibre material is advanced through the preheater vessel 2 by means of a screw 3 with such a speed that the staying time is as long as desired, i.e'. k 3 minutes, preferably 15 1 /2 minutes.
  • the screw 3 is for this purpose provided with variable operation.
  • the heated fibre material after its passage through the preheater vessel 2 is allowed to fall freelythrough a chute 4 adjusted to local conditions, usually in the form of a pipe, which is drawn through a separation funnel 5 mounted on the opening 6 to the feeddevice 7 of the refiner which at the embodiment shown is an inclined double-screw.
  • the feed device may also be of another kind, such as one or two separate horizontal feed screws.
  • the chute 4 opens suitably spaced from the opening 6 to the feed screws, so that the chips unobstructedly can fall into the feed screws 8, which feed the fibre material between the grinding discs 11, 12 of the refiner through the feed opening 13 in the grinding disc 12.
  • Said discs ll, 12 are provided with refining surfaces 9, 10.
  • the feed screws 8 are operated at such a high number of revolutions that they are only partially filled. It is hereby possible for the greater part of the steam formed during the refining process to escape rearwards through the system, from the refining zone and the central space between the grinding discs out through the feed openings 13 and through the only partially filled feed screws 8 out into the steam separation funnel 5.
  • the chute 4 for the chip transport being drawn down to a point close to the opening 6 of the feed screws 8, the greater part of the steam coming from the refiner can be transported through a separate duct 14 to the preheater vessel 2 and be utilized for heating the fibre material to lO-l 15C.
  • the steam discharged from the refiner is the only heat source for heating the fibre material, and no further steam need be added.
  • the steam flows through the preheater vessel 2 in a direction opposite to and thereby heating the fibre material, and the excess steam is evacuated through the duct 15 and control valve 16 located at the end of the preheater vessel where the fibre material is charged.
  • the control valve 16 By means of the control valve 16, the pressure and temperature are adjusted to the desired level in the entire system, as described above.
  • the invention is not restricted to the embodiment shown, but can be varied within the scope of the claims.
  • the refiner for example, may be of the single-disc type and the fibre material can then be charged in a corresponding manner through the stationary disc.
  • I claim: 1. In a method of treating fiber material involving the steps of first preheating the material with steam under elevated temperature and superatmospheric pressure consisting of conductingpart of said developed pressurized steam back into the preheater space in order to maintain the temperature and pressure in said preheater space.

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  • Paper (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US489138A 1973-09-06 1974-07-17 Mechanical refining of fiber material including steam recycle Expired - Lifetime US3921918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7312169A SE386694B (sv) 1973-09-06 1973-09-06 Sett for behandling av fibermaterial varvid fibermaterialet forst forvermes med anga i ett forvermarkerl

Publications (1)

Publication Number Publication Date
US3921918A true US3921918A (en) 1975-11-25

Family

ID=20318459

Family Applications (1)

Application Number Title Priority Date Filing Date
US489138A Expired - Lifetime US3921918A (en) 1973-09-06 1974-07-17 Mechanical refining of fiber material including steam recycle

Country Status (11)

Country Link
US (1) US3921918A (sv)
JP (1) JPS5245801B2 (sv)
AT (1) AT333582B (sv)
AU (1) AU475744B2 (sv)
BR (1) BR7407049D0 (sv)
CA (1) CA1004078A (sv)
DE (1) DE2442627C3 (sv)
FI (1) FI60580C (sv)
FR (1) FR2243297B1 (sv)
NO (1) NO142002C (sv)
SE (1) SE386694B (sv)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009835A (en) * 1975-04-04 1977-03-01 Yhtyneet Paperitehtaat Oy Jylhavaara Procedure and apparatus for preparation of hot groundwood
US4033811A (en) * 1975-06-09 1977-07-05 Stig Gloersen Method and apparatus for filling of fiber material and liquid to steam phase in treatment vessel
US4059237A (en) * 1974-02-15 1977-11-22 Oy Keskuslaboratorio - Centrallaboratorium, Ab System for feeding a double disc refiner
DE2734832A1 (de) * 1976-08-06 1978-02-09 Isel Sa Eine art, die in der zerfaserungszone entwickelte waerme auszunutzen, um den dampfdruck bei der herstellung von faserstoff fuer die erzeugung von faserplatten auf ein minimum abzusenken
US4078964A (en) * 1973-12-10 1978-03-14 Kamyr Ab Method and apparatus for filling a pressure treatment vessel with a fiber material and liquid mixture
US4163525A (en) * 1977-01-03 1979-08-07 Reinhall Rolf Bertil Device for evacuating blow-back steam in pulp refining apparatus
US4190005A (en) * 1978-12-15 1980-02-26 COMCO - Dravo Corporation Process for pulverizing coal using combination gas in fluid energy pulverizers
US4265701A (en) * 1980-01-07 1981-05-05 Ecodyne Corporation Liquid concentration method
US4298425A (en) * 1978-05-03 1981-11-03 Defibrator Aktiebolag Method and apparatus for refining lignocellulose-containing material to produce fiber pulp
US5655718A (en) * 1993-11-10 1997-08-12 Anderson; Joseph Apparatus, system and method for treating process material such as waste material
US20120091239A1 (en) * 2009-03-27 2012-04-19 Flsmidth A/S Feed Shaft for Feeding Particulate Material to a Mill
CN109537338A (zh) * 2018-12-21 2019-03-29 南京林业大学 曲折预热通道转斗式热磨机进料装置
CN113152134A (zh) * 2021-05-17 2021-07-23 中国制浆造纸研究院衢州分院 一种封闭式撕裂磨浆系统
SE543857C2 (en) * 2020-05-07 2021-08-17 Valmet Oy Method and apparatus for defibrating wood chips, and a return steam pipe for such an apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE403916B (sv) * 1975-06-04 1978-09-11 Rolf Bertil Reinhall Anordning vid malapparater for lignocellulosahaltigt material
US4132366A (en) * 1977-06-03 1979-01-02 The Bauer Bros. Co. Infeed tube for disc refiners
US4261522A (en) * 1979-07-19 1981-04-14 The Bauer Bros. Co. Feed and vent apparatus for refiners
JPS6077798U (ja) * 1983-10-31 1985-05-30 株式会社　山田製作所 内燃機関冷却用ポンプのインペラ装置
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
US5335865A (en) * 1992-06-26 1994-08-09 Andritz Sprout-Bauer, Inc. Two-stage variable intensity refiner
CN102962876A (zh) * 2012-11-30 2013-03-13 濮阳龙丰纸业有限公司 木片撕裂机的蒸汽装置
CN111749037A (zh) * 2020-05-26 2020-10-09 安徽华帆新材料科技有限公司 一种用于环保木板的打浆装置及其工作方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922313A (en) * 1931-06-27 1933-08-15 Masonite Corp Process and apparatus for disintegration of material
US2816831A (en) * 1949-04-02 1957-12-17 Goddard Harold Oliver Process for producing and concentrating residual waste sulphite liquor
US3238088A (en) * 1962-12-04 1966-03-01 Cia Ind De Ayotla Continuous digesting of cellulosic fibrous material at decreasing pressure with mechanical defibering therebetween
US3388037A (en) * 1963-05-31 1968-06-11 Defibrator Ab Method in the manufacture of wood pulp from chips in grinding apparatus in two stages
US3414038A (en) * 1965-06-21 1968-12-03 Kamyr Ab Heat recovery method and apparatus
US3425477A (en) * 1966-09-28 1969-02-04 Marathon Eng Inc Method for heat recovery in evaporating and burning spent liquor
US3773610A (en) * 1970-12-11 1973-11-20 Bauer Bros Co Pressurized system for pulp refining including pressurized double disk treatment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT180812B (de) * 1944-04-01 1955-01-25 Asplund Arne J A Verfahren und Vorrichtung zur Herstellung von Fasern aus Holz od. dgl. Lignozellulose enthaltenden Materialien

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922313A (en) * 1931-06-27 1933-08-15 Masonite Corp Process and apparatus for disintegration of material
US2816831A (en) * 1949-04-02 1957-12-17 Goddard Harold Oliver Process for producing and concentrating residual waste sulphite liquor
US3238088A (en) * 1962-12-04 1966-03-01 Cia Ind De Ayotla Continuous digesting of cellulosic fibrous material at decreasing pressure with mechanical defibering therebetween
US3388037A (en) * 1963-05-31 1968-06-11 Defibrator Ab Method in the manufacture of wood pulp from chips in grinding apparatus in two stages
US3414038A (en) * 1965-06-21 1968-12-03 Kamyr Ab Heat recovery method and apparatus
US3425477A (en) * 1966-09-28 1969-02-04 Marathon Eng Inc Method for heat recovery in evaporating and burning spent liquor
US3773610A (en) * 1970-12-11 1973-11-20 Bauer Bros Co Pressurized system for pulp refining including pressurized double disk treatment

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078964A (en) * 1973-12-10 1978-03-14 Kamyr Ab Method and apparatus for filling a pressure treatment vessel with a fiber material and liquid mixture
US4059237A (en) * 1974-02-15 1977-11-22 Oy Keskuslaboratorio - Centrallaboratorium, Ab System for feeding a double disc refiner
US4009835A (en) * 1975-04-04 1977-03-01 Yhtyneet Paperitehtaat Oy Jylhavaara Procedure and apparatus for preparation of hot groundwood
US4033811A (en) * 1975-06-09 1977-07-05 Stig Gloersen Method and apparatus for filling of fiber material and liquid to steam phase in treatment vessel
DE2734832A1 (de) * 1976-08-06 1978-02-09 Isel Sa Eine art, die in der zerfaserungszone entwickelte waerme auszunutzen, um den dampfdruck bei der herstellung von faserstoff fuer die erzeugung von faserplatten auf ein minimum abzusenken
US4136831A (en) * 1976-08-06 1979-01-30 Isel S.A. Method and apparatus for minimizing steam consumption in the production of pulp for fiberboard and the like
US4163525A (en) * 1977-01-03 1979-08-07 Reinhall Rolf Bertil Device for evacuating blow-back steam in pulp refining apparatus
US4298425A (en) * 1978-05-03 1981-11-03 Defibrator Aktiebolag Method and apparatus for refining lignocellulose-containing material to produce fiber pulp
US4190005A (en) * 1978-12-15 1980-02-26 COMCO - Dravo Corporation Process for pulverizing coal using combination gas in fluid energy pulverizers
US4265701A (en) * 1980-01-07 1981-05-05 Ecodyne Corporation Liquid concentration method
US5655718A (en) * 1993-11-10 1997-08-12 Anderson; Joseph Apparatus, system and method for treating process material such as waste material
US20120091239A1 (en) * 2009-03-27 2012-04-19 Flsmidth A/S Feed Shaft for Feeding Particulate Material to a Mill
CN109537338A (zh) * 2018-12-21 2019-03-29 南京林业大学 曲折预热通道转斗式热磨机进料装置
CN109537338B (zh) * 2018-12-21 2024-02-23 南京林业大学 曲折预热通道转斗式热磨机进料装置
SE543857C2 (en) * 2020-05-07 2021-08-17 Valmet Oy Method and apparatus for defibrating wood chips, and a return steam pipe for such an apparatus
SE2050526A1 (en) * 2020-05-07 2021-08-17 Valmet Oy Method and apparatus for defibrating wood chips, and a return steam pipe for such an apparatus
WO2021225490A1 (en) * 2020-05-07 2021-11-11 Valmet Ab Method and apparatus for defibrating wood chips, and a return steam pipe for such an apparatus.
CN113152134A (zh) * 2021-05-17 2021-07-23 中国制浆造纸研究院衢州分院 一种封闭式撕裂磨浆系统

Also Published As

Publication number Publication date
JPS5245801B2 (sv) 1977-11-18
SE386694B (sv) 1976-08-16
DE2442627C3 (de) 1982-04-01
CA1004078A (en) 1977-01-25
AT333582B (de) 1976-11-25
NO742628L (sv) 1975-04-01
NO142002C (no) 1980-06-11
FI60580B (fi) 1981-10-30
AU475744B2 (en) 1976-09-02
ATA635874A (de) 1976-03-15
BR7407049D0 (pt) 1975-09-09
DE2442627B2 (de) 1981-06-19
FI60580C (fi) 1982-02-10
JPS5053601A (sv) 1975-05-12
SE7312169L (sv) 1975-03-07
FI229774A (sv) 1975-03-07
AU7141474A (en) 1976-01-22
NO142002B (no) 1980-03-03
FR2243297B1 (sv) 1977-11-04
DE2442627A1 (de) 1975-03-27
FR2243297A1 (sv) 1975-04-04

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