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US3268923A - Extrusion washer - Google Patents

Extrusion washer Download PDF

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Publication number
US3268923A
US3268923A US366428A US36642864A US3268923A US 3268923 A US3268923 A US 3268923A US 366428 A US366428 A US 366428A US 36642864 A US36642864 A US 36642864A US 3268923 A US3268923 A US 3268923A
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US
United States
Prior art keywords
pulp
strainer
vessel
rotor
high consistency
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
US366428A
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English (en)
Inventor
Elmer R Burling
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.)
Improved Machinery Inc
Original Assignee
Improved Machinery Inc
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 Improved Machinery Inc filed Critical Improved Machinery Inc
Priority to US366428A priority Critical patent/US3268923A/en
Priority to NO00157953A priority patent/NO126699B/no
Priority to DE1461033A priority patent/DE1461033C3/de
Priority to FI651139A priority patent/FI46002C/fi
Application granted granted Critical
Publication of US3268923A publication Critical patent/US3268923A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents

Definitions

  • This invention relates to apparatus and methods for the treatment of Wood pulp and the like. More particularly, it relates to the treatment, as by washing, of high consistency wood pulp in an upflow system, for example, following a retention step in a treating process.
  • the bleaching retention and washing have required separate apparatus, usually a retention vessel and a rotary drum filter, together with means for transporting the pulp from one to the other. More specifically, these steps have been carried out at the desired consistency treating of 3 to percent, with the pulp being further diluted for transportation and pumping and for proper operation of a succeeding rotary drum filter for washing. In carrying out these steps, dilution was required, which is wasteful of water and of bleaching chemical, and a rotary drum filter had to be utilized as well as additional equipment to transfer the pulp from the retention vessel to the drum filter.
  • the invention provides a novel coaxial rotor mounted within said strainer, said rotor having an upper hollow portion with a foraminous wall extended preferably at least about two feet and generally parallel to and spaced inwardly from said strainer surface by between one and six inches and preferably between about two and four inches.
  • the rotor has a lower downwardly extending conical portion having central liquid inlet means adjacent its lower end, through which liquid may be supplied to dilute the pulp and so lubricate it as it passes radially outwardly along said conical portion.
  • liquid is flowed between said strainer and the rotor.
  • the rotor may be proice vided with helical vanes for advancing the annular ring of pulp thereby in a helical path upon relatively slow rotation of the rotor at a surface speed of a few feet per minute, say about 10 to 100, and may be provided with radially extending swept wall means along its lower conical surface as well for moving pulp radially outwardly therealong.
  • positive displacement means are preferably provided adjacent the bottom of the vessel acting solely on the bottom of the column of pulp.
  • Suitable discharge means are also provided, such being positioned above the strainer surface and rotor for discharging high consistency treated pulp from the vessel.
  • FIG. 1 is a side elevation, partly broken away and partly in section, of apparatus according to the invention.
  • FIGS. 2 and 3 are partial sections of the apparatus of FIG. 1 taken on lines 22 and 3-3 thereof, respectively.
  • the apparatus includes an upright elongated vessel having a cylindrical wall 12, a lower conical portion defined by a conical wall 14, with a central bottom inlet 16 at the downwardly extending point of said conical portion, and an upper discharge portion including an upper disklike wall 62.
  • a positive displacement pump 18 of a type capable of advancing high consistency pulp therethrough is providedat inlet 16, such a pump being shown and described in Patent No. 3,001,481, for example.
  • Other means such as the foraminous piston structure of Patent No. 2,878,116 may also be utilized for feeding high consistency pulp into the bottom of the vessel and advancing it upwardly therethrough.
  • a rotatable discharger having a plurality of arms 82 is provided in said upper discharge portion for discharging high consistency pulp into discharge conduit 84.
  • an annular strainer portion having an inverted conical strainer surface defined at the inner surface of wall 12 and including a surrounding chamber 24.
  • Said strainer surface is defined by the inner faces of a plurality of longitudinal extending bars 22 while the chamber is defined by the outer faces of said bars and by an overlying conical outer wall 26.
  • Bars 22 define upwardly and radially inwardly diverging slots therebetween and are open at their upper inner ends as is shown and described in Patent No. 2,998,064.
  • the inner surface of the strainer portion is defined by the inner faces of said bars, the .slots therebetween being sufliciently narrow to prevent the passage of wood pulp therebetween, say about 0.01 inch.
  • a plurality of radially outwardly extending liquid access openings 28, herein utilized as outlets, are provided for strainer chamber 24, such being connected to a suitable manifold 29.
  • the apparatus of the invention provides a novel coaxial rotor 30 mounted within said strainer.
  • Said rotor is hollow and includes an upper conical wall and a lower conical wall with an interconnecting vertical annular Wall 32-.
  • the upper conical wall consists of a plurality of longitudinally extended bars 34 preferably at least about two feet in longitudinal dimension and generally parallel to and spaced radially inwardly from strainer bars 22.
  • the spacing provided between said bars may be between one and six inches and is preferably between about two and four inches in order to provide a relatively thin and extended annular conical ring of pulp between the strainer and rotor, and is hereinafter more fully described.
  • a series of generally helical lifting vanes 40 extending radially outwardly from side 32 and mounted adjacent the lower end thereof may be provided to and in upward movement of pulp in a generally helical path between the opposed series of bars.
  • the rotor has a lower downwardly extending conical portion including a conical wall 36 which has a central liquid inlet 38 adjacent its lower end.
  • Said conical wall may be provided on its outer surface with a plurality of radially extending walls 50 swept backward with respect to the direction of rotation of the rotor 30 to aid in moving pulp radially outwardly therealong.
  • an inner central tube 42 is provided connected to conical wall 36 about its inlet 38 and extending upwardly beyond upper rotor wall 32 and a tube 44 coaxial with and surrounding inner tube 42 is provided connected to and also extending upwardly beyond upper rotor wall 44 to provide an inlet 46 into said hollow rotor 30 in the annular space between said tubes.
  • Outer tube 44 is rotatably mounted by a suitable bearing, herein shown as antifriction elements 48, on the upper disklike wall 52 of the vessel.
  • outer tube 44 For driving the rotor, outer tube 44 has a suitable gear 62 aflixed thereto, such being driven by a gear 64 connected to driving motor 66 by a shaft 68. Discharger means 82, by reason of their mounting on outer tube 44, are also rotated by said motor with rotor 30.
  • conduits For supplying liquid to dilution liquid inlet 38 and treating liquid inlet 46, fixed conduits connected to suitable sources of liquids (not shown) are mounted on upper vessel wall 52, said conduits including a conduit 72 for supplying dilution liquid to pipe 42 and its inlet 38 and conduit 74 for supplying treating liquid to pipe 44 and its inlet 46.
  • the mass of pulp When the advancing mass of pulp reaches the lower conical surface of rotor 30 with its overlying strainer 20, the mass is formed into an annular ring pulp defined between the rotor and vessel wall and strainer surfaces.
  • the central portion of the mass of pulp is diverted outwardly by the lower surface of rotor 30, such being uniquely made possible by supplying sufficient dilution liquid through the rotor inlet 38 to dilute at least a portion of the mass of pulp along the surface of the rotor to a relatively low consistency of less than 10 percent at which consistency sufficient liquid characteristics are present at the upper end of the pulp mass to enable it to advance generally radially along the surface of the rotor to the annular space between the rotor and the surrounding vessel wall and strainer. Walls 50 are also helpful in the desired radial movement.
  • vanes 40 not only aid in advancing it, but also rotate the ring to advance the pulp therethrough in a generally helical path, not only to increase the length of the path through which the pulp must travel relatively 4 to the longitudinal length of the ring, but also to eliminate so-called channelling as by direct flow of dilution liquid, either from rotor inlet 38 or from the strainer or rotor.
  • treating liquid such as Water for washing the chemical from the bleached or otherwise treated pulp
  • treating liquid may be flowed through the ring of pulp from the interior of rotor 30, outwardly between its bars 34 and inwardly between strainer bars 22 for discharge through strainer outlets 28, carrying with it chemical washed from the pulp.
  • a relatively thin layer of pulp of about one to six inches in thickness, preferably about two to four inches in thickness, at least about two feet long and possibly as long as four or five feet
  • the washing provided with equivalent volumes of washing water is at least equivalent to that provided by conventional drum filters, and with far less complex equipment.
  • the annular ring of pulp After passing beyond the open ends of the opposed series of bars 22 and 34, the annular ring of pulp, still at high consistency, is advanced into contact with discharger arms 82 which move it into discharge conduit 84 for such further treatment as may be desired.
  • the hollow rotor and strainer combination of the invention may be altered in its configuration to provide an annular washing ring of cylindrical configuration, for example.
  • the washing or other treatment zone may be varied in its cross sectional dimension, as to progressively decrease its cross section in the direction of pulp movement to squeeze the advanc ing pulp to remove liquid therefrom for increase of consistency.
  • the rotor may be adjusted vertically as by hearing shims 49 to vary said cross section, whether it be of the uniform cross section configuration as shown or of decreasing cross section.
  • additional inlets and outlets may be provided to rotor and strainer, for example, including an uppermost vacuum chamber to draw air through the pulp just before its discharge to further increase its consistency.
  • the apparatus of the invention makes it possible to control the consistency within the apparatus as desired, as to dilute the pulp to a suitably low consistency for effective washing or other treating in the treatment zone, and then to thicken it to high consistency for discharge to any extent desired, such as that at which the pulp was introduced to the apparatus.
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an extended foraminous surface generally parallel to and spaced from said strainer surface by between one and six inches and a lower downwardly extending conical portion,
  • liquid supply means for moving liquid between said strainer surface and said foraminous surface through said surfaces
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an extended conical foraminous upper surface generally parallel to and spaced downwardly from said strainer surface by between one and six inches,
  • liquid supply means for moving liquid between said strainer surface and said foraminous surface through said surfaces
  • inlet means adjacent the lower end of said vessel for feeding high consistency pulp into the bottom of said vessel and advancing said pulp upwardly through said vessel and in annular ring form between said strainer surface and said foraminous surface and discharge means positioned above said strainer surface for discharging high consistency treated pulp from said vessel.
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an extended foraminous surface generally parallel to and spaced from said strainer surface by between one and six inches and a lower downwardly extending conical portion having liquid inlet means adjacent its lower end,
  • liquid supply means for moving liquid generally radially between said strainer surface and said foraminous surface through said surfaces
  • dilution supply means for supplying dilution liquid to said liquid inlet
  • discharge means positioned above said strainer surface for discharging high consistency treated pulp from said vessel.
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an extended conical foraminous upper surface generally parallel to and spaced downwardly from said strainer surface by between one and six inches and a lower downwardly extending conical portion having liquid inlet means adjacent its lower end,
  • liquid supply means for moving liquid generally radially between said strainer surface and said foraminous surface through said surfaces
  • dil-ution supply means for supplying dilution liquid to said liquid inlet lrneans, input means adjacent the lower end of said vessel for feeding high consistency pulp into the bottom of said vessel and advancing said pulp upwardly through said vessel and in annular ring form between said strainer surface and said foraminous surface and discharge means positioned above said strainer surface for discharging high consistency treated pulp from said vessel.
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an upwardly and radially inwardly extending foraminous conical surface generally parallel to and spaced radially inwardly from said strainer surface by between one and six inches, at least one of said surfaces having upwardly and radially inwardly diverging open-ended slots,
  • liquid supply means for moving liquid between said strainer surface and said foraminous surface through said surfaces
  • positive displacement input means adjacent the lower end of said vessel for feeding high consistency pulp into the bottom of said vessel and advancing said pulp upwardly through said vessel and in annular ring form between said strainer surface and said foraminous surface and discharge means positioned above said strainer surface for discharging high consisttency treated pulp from said vessel.
  • Apparatus as claimed in claim 9 wherein said strainer surface and said foraminous surface is at least about two feet in length with a spacing therebetween of about two to four inches.
  • Apparatus for treating high consistency pulp or the like comprising:
  • a hollow coaxial rotor mounted within said strainer surface having an upwardly and radially inwardly extending foraminous conical surface generally parallel to and spaced radially inwardly from said strainer surface by between one and six inches with generally helical lifting vane means extending radially outwardly from said rotor at least adjacent the bottom end of said foraminous surface and a lower downwardly extending conical portion having central liquid inlet means adjacent its lower end and generally radially extending swept wall means on its outer surface, at least one of said surfaces having upwardly and radially inwardly diverging open ended slots,
  • liquid supply means for moving liquid generally radially between said strainer surface and said foraminous surface through said surfaces
  • dilution supply means for supplying dilution liquid to said central liquid inlet
  • positive displacement input means adjacent the lower end of said vessel for feeding high consistency pulp into the bottom of said vessel and advancing said pulp upwardly through said vessel and in annular ring form between said strainer surface and said formainous surface and discharge means positioned above said strainer surface for discharging high consistency treated pulp from said vessel.
  • a method of treating high consistency wood pulp comprising the steps of:
  • said wall thickness is from two to four inches with a length of at least about two feet.
  • a method of treating high consistency wood pulp comprising the steps of advancing upwardly in generally cylindrical columnar configuration with a height to width ratio of at least 3 to 1 a mass of wood pulp having a high consistency of from 10 to 40 percent by applying lifting forces solely at the lower end of said column,
  • a method of treating high consistency 'wood pulp comprising the steps of advancing upwardly in generally cylindrical columnar 8 i configuration with a height to width ratio of at least 3 to 1 a mass of wood pulp having a high consistency of from 10 to 40 percent by applying lifting forces solely at the lower end of said column, forming said mass at its upper end into a longituldinab ly extended annular ring of pulp having a wall thickness of from one to six inches by diverting said pulp radially outwardly from its central axis along an up- Wardly diverging conical surface, rotating said annular ring of pulp to move pulp advancing therethrough in a generally helical path and flowing a treating liquid generally radially through said annular ring of pulp to treat said pulp. 16.
  • a method of treating high consistency wood pulp comprising the steps of advancing upwardly in generally cylindrical columnar configuration with a height to width ratio of at least 3 to l a mass of wood pulp having a high consistency of from 10 to 40 percent by applying lifting forces solely at the lower end of said column, forming said mass at its upper end into a longitudinal- 1y extended annular ring of pulp having a length of at least about two feet and a wall thickness of from about two to four inches by diverting said pulp radially outwardly from its central axis along an upwardly diverging conical surface while diluting at least a portion of said pulp along said surface to a consistency of less than 10 percent, rotating said annular ring of pulp to move pulp advancing therethrough in a generally helical path, flowing a treating liquid generally radially through said annular ring of pulp to treat said pulp and discharging said treated pulp from the upper end of said ring at a high consistency of from 10 to 40 percent.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
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US366428A 1964-05-11 1964-05-11 Extrusion washer Expired - Lifetime US3268923A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US366428A US3268923A (en) 1964-05-11 1964-05-11 Extrusion washer
NO00157953A NO126699B (fi) 1964-05-11 1965-05-05
DE1461033A DE1461033C3 (de) 1964-05-11 1965-05-11 Verfahren und Vorrichtung zur Behandlung von pumpfähigem Holzschliff oder dergleichea
FI651139A FI46002C (fi) 1964-05-11 1965-05-11 Painepesulaite.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US366428A US3268923A (en) 1964-05-11 1964-05-11 Extrusion washer

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US3268923A true US3268923A (en) 1966-08-30

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US366428A Expired - Lifetime US3268923A (en) 1964-05-11 1964-05-11 Extrusion washer

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US (1) US3268923A (fi)
DE (1) DE1461033C3 (fi)
FI (1) FI46002C (fi)
NO (1) NO126699B (fi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348390A (en) * 1965-03-25 1967-10-24 Kamyr Ab Cellulosic material process vessel liquid distribution device
US4193839A (en) * 1976-05-11 1980-03-18 Kamyr, Inc. Flow control method and apparatus for continuous wood chip digester screenless liquor extractor
US5560229A (en) * 1994-01-24 1996-10-01 Kvaerner Pulping Technologies Ab Diffuser
US5836181A (en) * 1994-04-18 1998-11-17 Kvaerner Pulping Ab Diffuser
CN106609478A (zh) * 2016-12-23 2017-05-03 怀宁县群力汽车配件有限公司 一种带冲洗机构的纸浆漂白装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990710A (en) * 1958-10-13 1961-07-04 Improved Machinery Inc Pulp bleaching apparatus
US3078703A (en) * 1960-09-10 1963-02-26 Kamyr Ab Sieve arrangement in cylindrical containers for cellulosic pulp

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990710A (en) * 1958-10-13 1961-07-04 Improved Machinery Inc Pulp bleaching apparatus
US3078703A (en) * 1960-09-10 1963-02-26 Kamyr Ab Sieve arrangement in cylindrical containers for cellulosic pulp

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3348390A (en) * 1965-03-25 1967-10-24 Kamyr Ab Cellulosic material process vessel liquid distribution device
US4193839A (en) * 1976-05-11 1980-03-18 Kamyr, Inc. Flow control method and apparatus for continuous wood chip digester screenless liquor extractor
US5560229A (en) * 1994-01-24 1996-10-01 Kvaerner Pulping Technologies Ab Diffuser
US5836181A (en) * 1994-04-18 1998-11-17 Kvaerner Pulping Ab Diffuser
CN106609478A (zh) * 2016-12-23 2017-05-03 怀宁县群力汽车配件有限公司 一种带冲洗机构的纸浆漂白装置
CN106609478B (zh) * 2016-12-23 2018-06-15 台州市黄岩登丰文化用品有限公司 一种带冲洗机构的纸浆漂白装置

Also Published As

Publication number Publication date
DE1461033A1 (de) 1968-12-19
DE1461033B2 (de) 1974-01-31
FI46002C (fi) 1972-11-10
NO126699B (fi) 1973-03-12
FI46002B (fi) 1972-07-31
DE1461033C3 (de) 1974-09-26

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