US3078703A - Sieve arrangement in cylindrical containers for cellulosic pulp - Google Patents

Sieve arrangement in cylindrical containers for cellulosic pulp Download PDF

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Publication number
US3078703A
US3078703A US136327A US13632761A US3078703A US 3078703 A US3078703 A US 3078703A US 136327 A US136327 A US 136327A US 13632761 A US13632761 A US 13632761A US 3078703 A US3078703 A US 3078703A
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United States
Prior art keywords
sieve
container
shaft
sieve body
bore
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Expired - Lifetime
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US136327A
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English (en)
Inventor
Johan C F C Richter
Ole J Richter
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Metso Fiber Karlstad AB
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Kamyr AB
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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
    • D21C9/04—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in diffusers ; Washing of pulp of fluid consistency without substantially thickening

Definitions

  • the present invention relates to a sieve arrangement in upright cylindrical containers adapted for axially directed feed of a suspension of a comminuted fiber material and serving particularly for the removal of digesting lye from cellulosic pulp or for washing thereof after its digestion or bleaching.
  • the object of the invention is to create a sieve arrangement by means of which a sieving effect is obtained which is evenly distributed over the cross section of the container and which takes place with an extremely small resistance to the feed of the fiber material.
  • the main characterizing feature of the invention con sists in the provision of the container, of an annular sieve body coaxial to and rotary about the axis of the container, said sieve body being composed of two essentially vertical concentric walls placed one inside the other at a small mutual distance and at least one, but preferably both of said walls being apertured to form a sieve face, said sieve body having a cavity in communication with an exterior outlet for discharge of liquid entering the sieve body through said sieve face.
  • FIG. 1 is a vertical sectional view, taken along the broken line II in FIG. 3, of the upper end of a container equipped with a sieve device according to the invention.
  • FIG. 1a, FIG. 1b, FIG. 1c and FIG. 1d are sectional views taken on the lines a-a, bb, cc and d-d, re-
  • FIG. 2 is a horizontal View taken from the line II-II in FIG. 1
  • FIG. 3 is a horizontal sectional view taken from the line III-411 in-FIG. 1.
  • 11 designates the cylindrical wall of an upright container consisting of sheet iron or concrete and adapted for the performance of any kind of chemical treatment of a suspension of cellulosic fiber material.
  • the container may be a digester for wood chips, straw or similar cellulosic material, or a bleach tower for cellulosic pulp already digested and defibrated and of a more or less fluent consistency.
  • the container is arranged to allow the flow of fiber material in the upward direction, either fully continuously or semi-continuously, i.e. stepwise by periodically supplying thereto batches of pulp small in comparison to the volume of the container. Therefore the container is provided at its bottom with feeding devices (not shown) which cause the material to rise vertically up through the container. Provided at the F size of the various sieve surfaces.
  • Said discharging device may consist of a scraper composed of obliquely set blades 17 carried by radial arms 19 attached to a rotary vertical shaft 21.
  • Said shaft is arranged centrally in the container and its upper end which protrudes through the hood 13, carries a worm wheel pertaining to a gear 23 by means of which the shaft is turned.
  • the lower end of the shaft 21 which extends somewhat below the scraper, rests on a bearing 25 carried by a spider the arms 27 of which are attached to the container wall 11.
  • the container can be put under superatmospheric pressure which is maintained e.g. by air under overpressure supplied through a conduit 28.
  • the sieve device essentially consists of two annular sieve bodies 29 and 31 of different size, which by means of radial carrying arms 33, 35 and 37 and a hub 40 are attached to the shaft 21 in such positions as to be concentric to each other and to the container wall and also located essentially at the same level.
  • Either sieve body consists of two mainly cylindrical, perforated or slitted sieve plates 41, 43 of slightly different diameters which are put into each other and joined at their upper and lower edges. The distance between the sieve plates is considerably less than their axial length and is chosen with regard thereto that the cavity formed between the sieve plates shall allow quite free flow of the liquid sieved off and that the sieve body shall be rigid enough.
  • the sieve body is of a configuration which is elongated in the vertical direction and has pointed or rounded ends in order to form the least possible resistance to the flow of pulp past the same.
  • the upper and lower margins of the sieve plates may be bent towards each other and connected by Welding, as shown in FIG. 1, or they may be evenly curved, or angularly bent midway between the edges, the cross section of the sieve body then being either lenticular or acutely rhomb-shaped. In all these cases the sieve face extends essentially vertically. If desired, sieve apertures may be omitted at the marginal zones close to the pointed upper and lower edges of the sieve body.
  • the sieve plates are made fully cylindrical and welded to rings of a triangular or semicircular profile or of any other configuration suitable for cutting through the pulp column and for allowing its passage on both sides of the sieve body with the least possible resistance.
  • Arranged close around the hub 41 is another essentially cylindrical sieve face 45 of the same design as the sieve plate 41 but of a much less diameter.
  • the sieve bodies 29, 31 are located at such radialdistances from the axis of the container that the liquid sieved off through the five sieve plates, viz.
  • the sieve plates 41, 43 on each of the sieve bodies 29, 31 and the sieve plate 45 is approximately evenly distributed in proportion to the Usually that means that the radial distances between neighbouring sieve faces are equally great whereas the distance between the outermost sieve face and the wall of the container is half as great.
  • the sieve device is meant to be used merely for separating a part of the liquid contents of the fiber suspension from the solid material, the device as above described is complete and operable. If on the other hand, the sieving operation shall take place without a simultaneous concentration of the pulp and in connection with an exchange of liquids, such as a partial replacement of a treating liquid by a washing liquid, means are required also for the supply of liquid, and such means will now be described.
  • the shaft 21 has a bore 61 which is not in communication with the bore 55 and the cavity 53 but which is in communication with a cavity 63 in another one 37 of the carrying arms.
  • said arm On its upper side said arm is provided with a number of ejection apertures 65 which are located approximately midway between the various sieve faces and also outside of the sieve body 3-1.
  • a continuation of the bore 61 in the upward direction is formed by a tube 62 which is inserted in a wider bore 64 in the shaft 21.
  • the tube 62 rotates with the shaft 21 and the upper end of the same is connected by means of a sealing box 67 to a stationary tube 69 for a supply of washing liquid.
  • the liquid pumped in through said tube is spread by means of the ejection apertures of the rotary arm 37, over the cross section of the container at the level of the sieve faces, as indicated by the curved arrows in FIG. 1, the treating liquid being displaced thereby and discharged through the sieve faces and the drain 59 as above described.
  • ejection apertures may be provided also upon the carrying arm 35. Asshown in FIG. 2, the number of ejection apertures present in the various groups thereof increases as the distance from the shaft 21. The object thereof is to distribute the wash water supplied as evenly as possible over the cross section of the container. In the arrangement just described a flow of supplied washing liquid and displaced treating liquid is obtained which is directly mainly horizontally and therefore traverses the fiber material fed vertically upwardly, the movement of the latter thus being influenced merely slightly.
  • a radially directed arm 71 is attached to the shaft 21 somewhat above the sieve bodies 29, 31.
  • Said arm is provided with an inner cavity 73 which is in communication with the wide bore 64 of the shaft outside the tube 62, which bore in its turn is connected by means of a sealing box 75 to a second fixed tube 77 for supply of wash liquid.
  • the arm 71 is provided with a number of ejection apertures 79 which, as shown in FIG. 2, are made the closer the farther from the shaft in order to distribute the washing liquid evenly over the section of the pulp in the container.
  • washing liquid When washing liquid is supplied through the tube 77, the same is let out through the above-mentioned ejection apertures 79, and when the arm 71 is turned by means of the shaft 21, the washing liquid r is spread in an even distribution over the cross section of the container. Then the washing liquid penetrates the pulp in the downward direction, i.e. in counter-current thereto, and pushes the treating liquid to the sieve faces and therefrom to the outlet 59.
  • washing liquid may be supplied through one or the other of the tube 69, 77 but also simultaneously throughboth of them, if that proves advantageous.
  • the above-mentioned arms 33, 35, 37, the separate wash water supply arm 71 and the arms of the spider 27 all are of a streamlined cross section, as shown by the cross sectional views FIGS. 1a, 1b, 1c and la' placed on the left side of FIG. 1.
  • the cross section of the arms connected to the rotary shaft is oblique to the vertical give the least possible resistance to the flow of the pulp past the same.
  • the above described embodiment may be modified as to its details.
  • the liquid sieved off can be discharged through an other path than that one shown, cg. upwardly through the shaft.
  • means for supply of washing liquid can be arranged also between said groups.
  • doctors or similar means e.g. vertical resilient steel blades attached to the arms of the spider.
  • Apparatus for treating a suspension of comminuted fiber material in a liquid medium comprising: an upright cylindrical container for accommodating an axial flow of the suspension; an annular sieve bodywithin and coaxial with said container, said sieve body including two essentially vertical and concentric walls placed one within the other and spaced apart a small distance so as to form a cavity therebetween, at least one of said walls being apertured to form a sieve face; means mounting said sieve body for rotation about the axis of said container; said mounting means having a bore which communicates with said cavity and with an outlet for said container.
  • centric sieve bodies of different diameters are mounted within said container at approximately the same level.
  • said mounting means includes a rotatable shaft concentric to said conline and the degree of obliqueness should be chosen with regard to the speed of rotation of the shaft as well as to the feed of the pulp in such a manner that the arms tainer and a radial arm extending from said shaft and connecting said sieve body to said shaft, said arm having a bore communicating with a bore in said shaft and with said cavity in said sieve body.
  • Apparatus as in claim 4 including a second radial l arm extending from said shaft and connecting with said sieve body, said second arm having apertures therein and a bore which communicates with a second bore in said shaft whereby liquid may be directed into said container in a direction transverse to that of the flow of suspension through said container.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
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US136327A 1960-09-10 1961-09-06 Sieve arrangement in cylindrical containers for cellulosic pulp Expired - Lifetime US3078703A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE868660 1960-09-10

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US (1) US3078703A (enrdf_load_stackoverflow)
DE (1) DE1411283A1 (enrdf_load_stackoverflow)
FR (2) FR1305625A (enrdf_load_stackoverflow)
NO (1) NO120398B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268923A (en) * 1964-05-11 1966-08-30 Improved Machinery Inc Extrusion washer
US3298209A (en) * 1963-12-23 1967-01-17 Kamyr Ab Washing container
US3298900A (en) * 1963-03-22 1967-01-17 Kamyr Ab Method and apparatus for the continuous bleaching of cellulosic pulp
US3348390A (en) * 1965-03-25 1967-10-24 Kamyr Ab Cellulosic material process vessel liquid distribution device
US3524551A (en) * 1967-02-14 1970-08-18 Kamyr Ab Apparatus for concentrating and/or washing cellulosic pulp
US3595038A (en) * 1967-06-20 1971-07-27 Svenska Cellulosa Ab Apparatus for washing fibrous suspensions
US3599448A (en) * 1969-09-19 1971-08-17 Frank B K Green Diffusion pulp washer
US3677040A (en) * 1968-09-18 1972-07-18 Sunds Ab Apparatus for the washing of primarily, cellulosic pulp
US3704603A (en) * 1966-10-27 1972-12-05 Kamyr Ab Cellulose bleaching plant
US3985005A (en) * 1974-03-14 1976-10-12 Sunds Aktiebolag Apparatus for processing liquid-containing substance mixtures, particularly cellulose pulp
US4100069A (en) * 1977-02-28 1978-07-11 Kamyr, Inc. Two-stage pulp thickening
US4375410A (en) * 1979-04-25 1983-03-01 Kamyr Ab Reciprocating diffuser arrangements in an elongated vessel
US4529482A (en) * 1979-04-25 1985-07-16 Kamyr Aktiebolag Apparatus for the treatment of pulp having oscillating distributing wiper blades
US4556494A (en) * 1980-12-04 1985-12-03 Kamyr Aktiebolag Method of diffusion washing or thickening of pulp
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1111408A (en) * 1913-06-05 1914-09-22 Joseph Schneible Pulp-washing machine.
US2683366A (en) * 1949-02-26 1954-07-13 Kulvik Gunnar Washing arrangement for fibrous materials

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1111408A (en) * 1913-06-05 1914-09-22 Joseph Schneible Pulp-washing machine.
US2683366A (en) * 1949-02-26 1954-07-13 Kulvik Gunnar Washing arrangement for fibrous materials

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298900A (en) * 1963-03-22 1967-01-17 Kamyr Ab Method and apparatus for the continuous bleaching of cellulosic pulp
US3298209A (en) * 1963-12-23 1967-01-17 Kamyr Ab Washing container
US3268923A (en) * 1964-05-11 1966-08-30 Improved Machinery Inc Extrusion washer
US3348390A (en) * 1965-03-25 1967-10-24 Kamyr Ab Cellulosic material process vessel liquid distribution device
US3704603A (en) * 1966-10-27 1972-12-05 Kamyr Ab Cellulose bleaching plant
US3524551A (en) * 1967-02-14 1970-08-18 Kamyr Ab Apparatus for concentrating and/or washing cellulosic pulp
US3595038A (en) * 1967-06-20 1971-07-27 Svenska Cellulosa Ab Apparatus for washing fibrous suspensions
US3677040A (en) * 1968-09-18 1972-07-18 Sunds Ab Apparatus for the washing of primarily, cellulosic pulp
US3599448A (en) * 1969-09-19 1971-08-17 Frank B K Green Diffusion pulp washer
US3985005A (en) * 1974-03-14 1976-10-12 Sunds Aktiebolag Apparatus for processing liquid-containing substance mixtures, particularly cellulose pulp
US4100069A (en) * 1977-02-28 1978-07-11 Kamyr, Inc. Two-stage pulp thickening
US4375410A (en) * 1979-04-25 1983-03-01 Kamyr Ab Reciprocating diffuser arrangements in an elongated vessel
US4529482A (en) * 1979-04-25 1985-07-16 Kamyr Aktiebolag Apparatus for the treatment of pulp having oscillating distributing wiper blades
US4556494A (en) * 1980-12-04 1985-12-03 Kamyr Aktiebolag Method of diffusion washing or thickening of pulp
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester

Also Published As

Publication number Publication date
NO120398B (enrdf_load_stackoverflow) 1970-10-12
DE1411283A1 (de) 1968-10-03
FR82636E (fr) 1964-03-20
FR1305625A (fr) 1962-10-05

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