US20190309471A1 - Defibrator with separated blow valve - Google Patents

Defibrator with separated blow valve Download PDF

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Publication number
US20190309471A1
US20190309471A1 US16/308,977 US201716308977A US2019309471A1 US 20190309471 A1 US20190309471 A1 US 20190309471A1 US 201716308977 A US201716308977 A US 201716308977A US 2019309471 A1 US2019309471 A1 US 2019309471A1
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US
United States
Prior art keywords
blow valve
defibrator
mounting pipe
pulp
housing
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.)
Abandoned
Application number
US16/308,977
Other languages
English (en)
Inventor
Per Wallin
Örjan Ahlgren
Per Nyberg
Per Eriksson
Mattias GRANNAS
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
Valmet 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 Valmet AB filed Critical Valmet AB
Assigned to VALMET AB reassignment VALMET AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NYBERG, Per, AHLGREN, Örjan, WALLIN, PER, ERIKSSON, PER, GRANNAS, Mattias
Publication of US20190309471A1 publication Critical patent/US20190309471A1/en
Abandoned 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
    • 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
    • D21B1/26—Driving or feeding arrangements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • 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
    • D21B1/30—Defibrating by other means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • 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
    • 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
    • D21D1/303—Double disc mills

Definitions

  • the present invention relates generally to a defibrator used in the manufacture of pulp from lignocellulosic material, such as wood chips, and more particularly to a blow valve through which fibrous pulp leaves a defibrator housing, and even more particularly to a specific mounting arrangement for such a blow valve between a discharge pipe and a specially arranged mounting pipe connected to the defibrator housing.
  • a defibrator is a refining apparatus in which lignocellulosic materials, e.g., wood chips, saw dust and other fibrous materials from wood or plant, are ground between two refining elements in an environment of steam.
  • a typical defibrator for processing fibrous materials is a disc-type refiner, wherein two refiner plates—which also are referred to as refiner discs—are positioned opposite to each and wherein at least one refiner plate rotates with respect to the other refiner plate.
  • the lignocellulosic material to be refined is fed into a central inlet in at least one of the two refiner plates, and moves therefrom into a refining gap arranged between the two refiner plates.
  • the opposing refiner plates have surfaces that include bars and grooves, and the lignocellulosic material is—in the refining gap provided between crossing bars of the opposing refiner plates—separated into fibers by forces created by the crossing bars as the refiner plates rotate in relation to each other.
  • Another type of defibrator is a drum-type refiner, in which a refining gap is formed between an outer cylindrical drum and a rotor that rotates inside the outer cylindrical drum.
  • thermo-mechanical refining process a considerable amount of energy is required to create and maintain the rotational movement that separates the lignocellulosic material into fibers, and a large part of this mechanical energy is converted into heat, whereby steam is generated in a defibrator housing in which the defibrator with its refining elements is arranged.
  • a blow valve also referred to as a discharge valve—is arranged at the defibrator housing and is connected to the discharge pipe, and the pulp is fed through this blow valve before being fed into the discharge pipe for further transport and processing.
  • An arrangement of this type is, for example, disclosed in the U.S. Pat. No. 4,163,525 to Reinhall.
  • the energy consumption in a defibrator is high, and there are always ongoing efforts to reduce this energy consumption and thereby the operating costs of a defibrator. This can, for example, involve more efficient use of the steam generated in the refining process.
  • Another technical challenge is a substantial wear of components in a defibrator, which reduces the operating life-time of these components and leads to high operating costs. Examples of such wear-subjected components are the refining elements, e.g. refiner plates, and also the blow valve, which is arranged at the defibrator housing and through which pulp is fed out into a discharge pipe.
  • An object of the present invention is therefore to reduce the energy consumption in a system comprising a defibrator.
  • Another object is to increase the operational life time for a blow valve arranged at a defibrator housing by reducing the wear of this blow valve.
  • the invention relates to a pulp refining system comprising a defibrator arranged in a defibrator housing, which has a portion from which pulp is fed out to a discharge pipe.
  • the pulp refining system comprises further a blow valve, which—according to the invention—is mounted before (as seen in the pulp transport direction) the discharge pipe and is connected to the defibrator housing by a mounting pipe having a length, which is at least about 0.2 meter, and more preferably at least about 0.5 m, and even more preferably about 0.7-1.5 m.
  • the mounting pipe has the same diameter at its inlet, which is connected to the defibrator housing, as at its outlet, which is connected to the inlet of the blow valve.
  • This diameter is further preferably the same as the diameter of a flow channel through the blow valve when the blow valve is in a fully open position.
  • FIG. 1 is a schematic illustration of a pulp refining system according to the present invention.
  • FIG. 2 is a schematic illustration of a blow valve, a discharge pipe and a mounting pipe arranged in the pulp refining system illustrated in FIG. 1 .
  • FIG. 1 illustrates schematically a refining system 1 , which comprises a defibrator 2 with a first refining element 3 and a second refining element 4 .
  • the first refining element 3 is a stationary refining disc 3
  • the second refining element 4 is a rotating refining disc 4 .
  • the type of refining elements is not crucial for the present invention, and the refining elements could, for example, instead of refining discs be a rotor that rotates within an outer drum.
  • the defibrator 2 is arranged within a defibrator housing 5 , which, because of the steam generated by the mechanical forces created when the lignocellulosic material is ground between the first refining element 3 and the second refining element 4 , contains a pressurized atmosphere. Pulp, which has been ground between the two refining elements 3 , 4 , leaves the defibrator housing 5 at a house portion 6 , and enters into a mounting pipe 7 , whose inlet 8 is connected to the defibrator housing 5 and whose outlet 9 is connected to an inlet 10 of a blow valve 11 , whose outlet 12 is connected to an inlet 13 of a discharge pipe 14 .
  • a mounting pipe such as mounting pipe 7
  • a blow valve such as blow valve 11
  • a defibrator housing such as defibrator housing 5
  • the mounting pipe 7 which has non-negligible length, surprisingly positive effects have been achieved both regarding the energy consumption of the defibrator 2 and also regarding the wear of the blow valve 11 .
  • the provision of the mounting pipe 7 before the blow valve 11 creates a laminar pulp flow through the blow valve 11 , i.e.
  • the pulp flow at the exit from the defibrator housing 5 i.e. at the inlet 8 of the mounting pipe 7
  • the pulp flow at the exit from the defibrator housing 5 is presumably highly turbulent, and by providing the mounting pipe 7 , which has a non-negligible length, the pulp flow is “settling down” and a laminar flow is established at the outlet 9 of the mounting pipe 7 . And it is further believed that this laminar pulp flow is less aggressive and exposes the inner surfaces of the blow valve 11 to less wear.
  • the mounting pipe 7 has been given a length of at least about 0.2 m, and more preferably a length of at least about 0.5 m, and even more preferably of at least about 0.7 m.
  • the length of the mounting pipe 7 is indicated by an “L”.
  • the maximal length of a mounting pipe, such as mounting pipe 7 is not so crucial for practicing the present invention. However, if for some reasons the blow valve 11 is closed, pulp will plug and block the mounting pipe 7 and it may take a considerable time to remove this pulp and put the refining system 1 back into operation again. Furthermore, it is the steam pressure generated in the defibrator 2 that drives the refining system 1 , i.e.
  • the steam pressure forces the pulp forward and through the mounting pipe 7 , the blow valve 11 and the discharge pipe 14 and also through further components and pipes which are not seen in the figures; and more specifically, it is the pressure drop over a pipe or component section, such as over mounting pipe 7 , that creates a pulp flow through the section in question.
  • a blow valve such as blow valve 11
  • the length of the mounting pipe 7 should not be longer than necessary, and a suitable maximal length is about 1.5 m, i.e. 0.2 m ⁇ L ⁇ 1.5 m.
  • the mounting pipe 7 , the blow valve 11 and the discharge pipe 14 are schematically illustrated in FIG. 2 .
  • the mounting pipe 7 has preferably a circular inner cross-section with an inner diameter d 1 , which preferably is constant, i.e. the diameter d 1 is the same at the inlet 8 of the mounting pipe 7 as at the outlet 9 of the mounting pipe 7 .
  • the blow valve 11 comprises a valve housing 15 , which, inter alia, encloses a flow channel 16 , through which the pulp is intended to flow.
  • the cross-sectional area of the flow channel 16 can be regulated by a valve member 17 , which can be introduced into the flow channel 16 to thereby reduce the size of the cross-sectional area of the flow channel 16 , but according to the present invention, the cross-section of the flow channel 16 of the blow valve 11 is preferably equal to the cross-section of the mounting pipe 7 .
  • the latter is typically but not necessarily the case when the blow valve 11 is in its fully open position, i.e. when the valve member 17 has been retracted out of the flow channel 16 and does not restrict the pulp flow through the blow valve 11 .
  • the flow channel 16 has a preferably a circular cross-section with a diameter d 2 , which is preferably equal, or at least approximately equal, to the diameter d 1 of the mounting pipe 7 , which then preferably also has a circular cross-section with d 1 ⁇ d 2 . If for some reasons, other cross-sectional shapes than circular are chosen for a mounting pipe and a flow channel through a blow valve, these cross-sectional shapes should be essentially equal for the mounting pipe and the flow channel, and the cross-sectional areas should also be essentially equal.
  • the mounting pipe 7 has been shown as a separate component. It is, however, within the scope of the invention that a mounting pipe is created as a prolonged inlet portion of a blow valve, i.e. the inlet portion is integrated with the blow valve.
  • a mounting pipe according to the invention is therefore in this case configured as a mounting portion of a blow valve.
  • a combination of a separate mounting pipe and a mounting portion of a blow valve is also within the scope of the invention.
  • a length of a mounting pipe such as the length L in FIG. 1 , or a length of a mounting pipe which is configured as a mounting portion of a blow valve, or a length of a combination of a mounting pipe and a mounting portion, should always be measured from a defibrator housing to a first or closest side—as seen in the pulp transport direction—of a valve member arranged in a blow valve, which is connected to a discharge pipe.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US16/308,977 2016-06-13 2017-06-01 Defibrator with separated blow valve Abandoned US20190309471A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE1650825-1 2016-06-13
SE1650825A SE1650825A1 (sv) 2016-06-13 2016-06-13 Defibrator with separated blow valve
PCT/SE2017/050587 WO2017217909A1 (en) 2016-06-13 2017-06-01 Defibrator with separated blow valve

Publications (1)

Publication Number Publication Date
US20190309471A1 true US20190309471A1 (en) 2019-10-10

Family

ID=60000078

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/308,977 Abandoned US20190309471A1 (en) 2016-06-13 2017-06-01 Defibrator with separated blow valve

Country Status (6)

Country Link
US (1) US20190309471A1 (sv)
EP (1) EP3469139B1 (sv)
CN (1) CN109154140B (sv)
BR (1) BR112018068968A2 (sv)
SE (1) SE1650825A1 (sv)
WO (1) WO2017217909A1 (sv)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931586A (en) * 1957-08-16 1960-04-05 American Defibrator Grinding device for the breaking down of wood fibres
US3765611A (en) 1972-08-07 1973-10-16 Bauer Bros Co Refining process
GB1590704A (en) * 1976-11-23 1981-06-10 Defibrator Ab Method end device for the continuous production of pulp from fibrous lignocellulosic materials
SE413522B (sv) * 1977-01-03 1980-06-02 Reinhall Rolf Bertil Anordning vid framstellning av fibermassa av lignocellulosahaltigt material
SE436287B (sv) * 1983-04-12 1984-11-26 Sunds Defibrator Sett och anordning for framstellning av fibermassa fran lignocellulosahaltigt material
SE528361C2 (sv) * 2005-04-18 2006-10-24 Metso Panelboard Ab Malhus
US9181654B2 (en) * 2012-05-30 2015-11-10 Andritz Inc. Refiner plate having a smooth, wave-like groove and related methods

Also Published As

Publication number Publication date
SE539556C2 (sv) 2017-10-10
CN109154140B (zh) 2020-10-16
CN109154140A (zh) 2019-01-04
EP3469139A4 (en) 2020-02-26
BR112018068968A2 (pt) 2019-01-22
EP3469139A1 (en) 2019-04-17
EP3469139B1 (en) 2020-12-02
SE1650825A1 (sv) 2017-10-10
WO2017217909A1 (en) 2017-12-21

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