WO1999009242A1 - Procede et appareil de granulation de copeaux de bois pour la production de pates et papier - Google Patents

Procede et appareil de granulation de copeaux de bois pour la production de pates et papier Download PDF

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Publication number
WO1999009242A1
WO1999009242A1 PCT/US1998/016724 US9816724W WO9909242A1 WO 1999009242 A1 WO1999009242 A1 WO 1999009242A1 US 9816724 W US9816724 W US 9816724W WO 9909242 A1 WO9909242 A1 WO 9909242A1
Authority
WO
WIPO (PCT)
Prior art keywords
wood
wood chips
pellets
cylinder
pulp
Prior art date
Application number
PCT/US1998/016724
Other languages
English (en)
Inventor
David D. Linn
Original Assignee
Stone Container Corporation
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 Stone Container Corporation filed Critical Stone Container Corporation
Priority to AU89042/98A priority Critical patent/AU8904298A/en
Publication of WO1999009242A1 publication Critical patent/WO1999009242A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the invention is directed to the preprocessing of raw wood fibers for utilization in the production of pulp and paper, and more particularly to the pelletizing of wood chips for pulp and paper production, to increase the density of low density, high moisture content wood for more efficient transportation thereof and for improved performance in pulp and paper production.
  • Gmelina trees develop quickly; from planting to a fully grown tree 20-25 meters high and having a trunk diameter of 25-30 cm, in only five years. Entire plantations and farms have been established in Central America that plant and harvest the Gmelina trees for pulp and paper production.
  • the use of Gmelina trees from farms and plantations is environmentally friendly, inasmuch as the plantations replant trees and recycle the land, thereby lessening deforestation. Additionally, due to the relatively short growth cycle, Gmelina trees are relatively inexpensive to plant and harvest.
  • Gmelina trees as well as other low density wood, is that the wood is inefficient to transport. This type of wood absorbs and retains a substantial amount of moisture, and per cubic volume, contains less wood fiber than comparable volumes of high density hardwood. Essentially, each cargo load of Gmelina, or other lower density wood, yields less wood fiber per unit volume that is suitable for pulp and paper production than a comparable volume of high density hardwood. In particular, Gmelina trees have a density of only 21.4 lbs per cubic foot and have a moisture content of 50-60 percent.
  • Gmelina trees and other trees of lower density, encounter certain difficulties during the pulp and paper production process. Due to the low density of Gmelina certain pulp and paper production machinery, such as certain digesters have lower production ratios when processing this type of wood.
  • the apparatus of producing wood pellets for pulp and paper production comprises means for cutting said wood into wood chips, means for dehydrating said wood chips, a compressor member, and means for retaining the length of long wood fibers.
  • the dehydrating means serves to eliminate excess moisture in the wood chips.
  • the compressor member is associated with the dehydrating means.
  • the compressor member is capable of compressing the wood chips into fiber pellets while increasing the density of the fiber pellets, which increases the digester loading in conventional pulp and paper production equipment.
  • the retaining means serves to preserve fiber continuity which in turn prevents damage to the long wood fibers.
  • the compressor member includes a cylinder having a first end and a second end.
  • the second end includes an opening.
  • a piston member slidably positioned between the first end and a second end of the cylinder member. The piston is capable of forcing the wood chips through the opening in the second end.
  • the dehydrating means comprises a heater member.
  • the apparatus may further include adhesion enhancement means associated with the compressor member.
  • the resulting pellet is a cube dimensioned to have a length and width between one half inch and three inches, and preferably one inch.
  • the invention additionally comprises a method for pelletizing wood for pulp and paper production.
  • the wood initially has a high moisture content and a low density.
  • the method comprises the steps of (a) cutting the wood into a plurality of wood chips, wherein each of the wood chips include a plurality of preserved long wood fibers; (b) dehydrating the wood chips to eliminate excess moisture contained therein; (c) compressing a predetermined amount of the plurality of wood chips into wood fiber pellets while increasing the density of same towards compatible digestion by conventional pulp and paper production equipment; and (d) retaining the length of the long wood fibers within the pellets to preserve fiber continuity, to, in turn, prevent damage to the long wood fibers.
  • the step of compressing the wood chips comprises the steps of (a) positioning the wood chips between a first end and a second end of a cylinder where the second end includes an opening therethrough.
  • the cylinder includes a piston slidably associated with the cylinder, and the piston is capable of slidable movement from the first end to the second end; and (b) forwarding the piston from said second end of said cylinder to said first end of the cylinder and extruding wood pellets through the opening in the second end of the cylinder.
  • the step of dehydrating comprises the step of heating the wood chips for a predetermined period of time.
  • the invention comprises the step of enhancing the adhesion of the wood chips prior to or during the step of compressing the wood chips, to, in turn, further foster the compression thereof and the adhesion therebetween.
  • said wood chip comprises a conventional export size wood chip.
  • said pellets comprise a cube having a width and height between one half inch and three inches, and preferably one inch.
  • said resulting wood pellets comprise a cylinder having a diameter between one half and three inches, and preferably one inch.
  • the step of producing pulp and paper from low density, high water content wood comprises the steps of (a) cutting said wood into a plurality of wood chips, each of the wood chips including a plurality of preserved long wood fibers; (b) dehydrating the wood chips to eliminate excess moisture in the wood chips; (c) compressing a predetermined amount of said plurality of wood chips into wood fiber pellets while increasing the density of same toward compatible digestion by conventional pulp and paper production equipment; (d) retaining the length of the long wood fibers within the pellets to preserve fiber continuity, to, in turn, prevent damage to the long wood fibers;
  • said digester operates at an elevated temperature and pressure relative to the ambient temperature and pressure.
  • Fig. 1 of the drawings is an elevated schematic view of the chipping means in operation
  • Fig. 2 of the drawings is a cross-sectional view of a compressor member
  • Fig. 3 of the drawings is a cross-sectional view of dehydrating means
  • Fig. 4 of the drawings is a perspective view of a compressor member
  • Fig. 5 of the drawings is a perspective view of an individual wood chip
  • Fig. 6 of the drawings is a perspective view of a series of resulting wood pellets made up of said wood chips; and Fig. 7 of the drawings is an elevated schematic view of the wood pellets of Fig. 6 being fed to a digester in conventional pulp and paper-making equipment.
  • Apparatus 10 is shown in Figs. 1 , 2, 3 and 7 as comprising cutting means 1 2, compressor member 14, dehydrating means 1 6, adhesion enhancement means 1 8 and digester member 20.
  • Cutting means 1 2 comprises any one of a multitude of methods for cutting the wood into wood chips of the desired size (as will be explained below), such as special shredding machines, chipping machines and the like, as known in the art.
  • the wood chips are generally stored on a chip pad, or other conventional storage apparatus until needed.
  • Dehydration means 1 6 is shown in Fig. 3 as comprising heating chamber
  • Heating chamber 28 includes screw advance 71 , chip intake 72 and chip exit region 73.
  • the heating chamber is configured to accept wood chips and to heat wood chips to elevated temperatures, which, in turn, dehydrates the wood chips.
  • heater member 28 may be associated with a gas or electric heater source 49 positioned proximate thereto, or, may comprise a forced hot air system. Of course, other types of heaters are likewise contemplated.
  • Compressor member 14 is shown in Figs. 2 and 4 as comprising cylinder 24, piston 22 and opening 47.
  • Cylinder 24 includes first end 30, second end 32, cross-section 23.
  • Piston 22 includes outer configuration 29 and pusher member 27. Outer configuration 29 corresponds to cross-section 23 so that piston 22 is slidably positionable within cylinder 24 and selectively slidable from second end 32 and first end 30 of cylinder 24.
  • the operation and movement of piston 22 within cylinder 24 may be powered by an electric motor, an internal combustion motor, or other power source.
  • the moving force for the piston may comprise a screw advance, as well as hydraulic and/or pneumatic power devices. Additionally, other compression type devices are contemplated for use.
  • Opening 47 may be of a multitude of shapes, such as, for example circular or square, among others. Where the opening is square or rectangular the width and height is preferably greater than one half inch (or a one half inch diameter in the case of a circular opening), while a multitude of sizes are contemplated for use. Preferably, having an area greater than one inch assures that the long wood fibers 104 (Fig. 5) will be retained in an undamaged state.
  • the upper limit of the opening may be as large as desired, however, where the width, height (and/or diameter in the case of a circular opening) exceeds three inches, undesirable air pockets may form within the wood fiber pellet.
  • Adhesion enhancement means 18 is shown in Fig. 2 as comprising fluid/slurry source 41 and a plurality of openings, such as openings 31 , which extend through cylinder 24.
  • the adhesion enhancement means facilitates pelletizing and adhesion between wood chips during the compression of same. While other means of adhesion enhancement are contemplated, one such means directs water, steam or any combination thereof at a desired velocity and/or pressure from source 41 into cylinder 24. Of course, the use of other fluids/slurries to enhance the adhesion of wood chips is likewise contemplated. Additionally, the quantity of openings, the spacing of openings and the size of the individual openings can vary from application to application and can be determined through testing.
  • Digester 20 is shown in Fig. 7 as comprising a conventional digester of a conventional pulp and paper production plant operating at an elevated temperature and pressure. Such digesters are known to those of skill in the art.
  • the wood is first transformed into wood chips by cutting means 12.
  • splitting cutter member 21 cuts the wood into wood chips 100 (Fig. 5).
  • the wood chips comprise standard export wood chips (approximately an 1 /4 inch thick, and between a half inch and an inch in width and length). While other sizes of wood chips are contemplated, it is important not to make the wood chips too small, inasmuch as such small wood chips will necessarily result in short and/or damaged wood fibers. It is desirable in the production of pulp and paper to retain long wood fibers 104, which can be achieved through the use of standard export wood chips (Fig. 5).
  • the wood may next be dehydrated. As shown in Fig. 3, the dehydration of the wood is accomplished by placing the wood chips into heater member 28 which removes moisture from the wood chips. Additionally, chips that are either too small or too large may be filtered out prior to or immediately after this step dehydrating in the heater member.
  • the wood chips are placed into the cylinder for compression and, in turn, pelletizing through compression member 14.
  • piston 22 is moved from the second end 32 to the first end 30 of cylinder 24.
  • the wood chips are forced against the first end of the cylinder and, in turn, through smaller opening 47 proximate first end 30 of cylinder 24.
  • adhesion enhancement means is activated to promote adhesion of the wood chips. This further enhances the pelletizing and the attachment of the wood chips to each other. Specifically, water/steam can be forced through opening 31 and can penetrate into the wood chips themselves. Of course, as explained above, other fluids/slurries are likewise contemplated.
  • the extrusion can be broken into pellets, (such as cylinders) or cubes. Preferably, the extrusion is cut so that the thickness of the resulting pellet is between one half and three inches, while other dimensions are also certainly contemplated.
  • the pellets can be cooled back to ambient temperature either by exposure to ambient or cooler temperature conditions or by other cooling methods such as forced air cooling. Additionally, the wood chips before extrusion, and, the pellets after extrusion can pass through screens and/or filters which will eliminate loose wood chips and wood residue from the pellets and send these "rejects" to reprocessing.
  • the wood pellet/cube 102 (Fig. 6) comprises a high density wood fiber material substantially free of moisture and air, which can then be transported to a pulp and paper mill. In the situation of Gmelina wood, the wood is harvested in Central America for processing in the Far East, among other regions.
  • the wood pellets are prepared for processing, it is only necessary to introduce the pellets to conventional digester 20. There is no need to regrind the pellets prior to introduction into the digesters. Indeed, the digesters operate at an elevated temperature and pressure, and as such the pellets begin to separate and cook, as desired, upon the introduction into the digester ⁇ but in the correct fiber size. It is believed that the pelletized, compressed, wood chips will improve the performance of the digesters, which as explained above, do not typically operate efficiently with lower density wood.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

L'invention concerne un appareil permettant de produire des granulés de bois pour la production de pâtes et papier. Cet appareil comprend un élément de coupe (12), un élément compresseur (14), un élément de retenue des fibres longues (104) et un élément de déshydratation (16). L'élément de coupe (12) coupe le bois en copeaux de bois. L'élément compresseur (14) permet de comprimer et d'extruder les copeaux de bois. L'élément de déshydratation (16) est associé à l'élément compresseur (14) et facilite la déshydratation des copeaux de bois. L'élément de retenue des fibres longues (104) évite que les fibres longues ne soient endommagées pendant leur compression. L'invention concerne, en outre, un procédé de production de granulés de bois pour la production de pâtes et papier.
PCT/US1998/016724 1997-08-19 1998-08-12 Procede et appareil de granulation de copeaux de bois pour la production de pates et papier WO1999009242A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU89042/98A AU8904298A (en) 1997-08-19 1998-08-12 Method and apparatus for pelletizing wood chips for pulp and paper production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US91697197A 1997-08-19 1997-08-19
US08/916,971 1997-08-19

Publications (1)

Publication Number Publication Date
WO1999009242A1 true WO1999009242A1 (fr) 1999-02-25

Family

ID=25438164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/016724 WO1999009242A1 (fr) 1997-08-19 1998-08-12 Procede et appareil de granulation de copeaux de bois pour la production de pates et papier

Country Status (2)

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AU (1) AU8904298A (fr)
WO (1) WO1999009242A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726903A1 (fr) * 2005-05-25 2006-11-29 San Ford Machinery Co., Ltd. Dispositif de séchage pour une machine d'accumulation de déchets de bois.
WO2010093812A3 (fr) * 2009-02-13 2011-01-06 Zilkha Biomass Fuels Llc Procédés permettant de produire du carburant à base de biomasse avec un équipement de traitement de pulpe
US7896268B2 (en) 2009-03-11 2011-03-01 Cem Machine, Inc. Apparatus for producing small size wood chips
US8051887B2 (en) 2009-11-04 2011-11-08 Cem Machine, Inc. Primary and counter knife assembly for use in wood chipper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324561A (en) * 1975-06-26 1982-04-13 Nipac, Ltd. Combustible fuel pellets formed from botanical material
US4530700A (en) * 1982-05-28 1985-07-23 Sawyer Willard C Method and apparatus for use in preparing biomass particles for fuel and for use as chemical feed stock
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324561A (en) * 1975-06-26 1982-04-13 Nipac, Ltd. Combustible fuel pellets formed from botanical material
US4530700A (en) * 1982-05-28 1985-07-23 Sawyer Willard C Method and apparatus for use in preparing biomass particles for fuel and for use as chemical feed stock
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, 1 January 1900, Columbus, Ohio, US; abstract no. AB5907351, DENCH I D, FARRINGTON A: "New Furnish for Soda and Kraft Pulp Mills" XP002914754 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726903A1 (fr) * 2005-05-25 2006-11-29 San Ford Machinery Co., Ltd. Dispositif de séchage pour une machine d'accumulation de déchets de bois.
WO2010093812A3 (fr) * 2009-02-13 2011-01-06 Zilkha Biomass Fuels Llc Procédés permettant de produire du carburant à base de biomasse avec un équipement de traitement de pulpe
US7896268B2 (en) 2009-03-11 2011-03-01 Cem Machine, Inc. Apparatus for producing small size wood chips
US8051887B2 (en) 2009-11-04 2011-11-08 Cem Machine, Inc. Primary and counter knife assembly for use in wood chipper

Also Published As

Publication number Publication date
AU8904298A (en) 1999-03-08

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