US3643878A - Device for feeding dense cellulosic pulp into a closed container - Google Patents

Device for feeding dense cellulosic pulp into a closed container Download PDF

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Publication number
US3643878A
US3643878A US20760A US3643878DA US3643878A US 3643878 A US3643878 A US 3643878A US 20760 A US20760 A US 20760A US 3643878D A US3643878D A US 3643878DA US 3643878 A US3643878 A US 3643878A
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United States
Prior art keywords
pulp
breaker
inlet
conduit
container
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Expired - Lifetime
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US20760A
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English (en)
Inventor
Johan C F C 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
    • D21C9/10—Bleaching ; Apparatus therefor

Definitions

  • ABSTRACT 1 69 pr Sweden 4834/69 A means for fluffing cellulosrc pulp that should be treated 1n a gaseous environment, e.g., bleached with a gaseous bleaching [521 US. Cl ..24l/48, 241/57, 241/186, age-ml consists ofa rotary breaker inserted in an inlet chamber 241/280 at the top of the container in which the treatment takes place. [51 Int.
  • the breaker comprises a h i d b a -fl h f d a [58] Field of Search ..241/48, 57, 100, 186, 278, number f inclined vanes i i d over h li d i l fac 241/280 of said hub and having serrated edges working upon a plug of pulp continuously fed into said inlet chamber through a horizontal conduit having its orifice opposite the breaker.
  • the invention relates to the feeding of dense cellulosic pulp into a container wherein the pulp should be treated in gas phase, e.g., bleached with a gaseous bleaching agent.
  • gas phase e.g., bleached with a gaseous bleaching agent.
  • the invention relates to a device suitable for this purpose, which is characterized in that a breaking means rotary about a vertical axis and having breaking teeth protruding from a hub is located in a vertical tubular inlet chamber upon the container and opposite to an aperture in the wall thereof, into which there opens an essentially horizontal conduit provided with a device for feeding pulp in the shape of a compressed plug continuously therethrough.
  • FIG. 1 is a vertical sectional view of the upper end of a treatment container equipped with the device in question
  • FIG. 2 is a vertical sectional view taken along the line "-11 in FIG. 1.
  • ll designates an upright cylindrical container adapted for continuous bleaching of high-consistency cellulosic pulp with a gaseous bleaching agent, e.g., chlorine dioxide.
  • a gaseous bleaching agent e.g., chlorine dioxide.
  • the container is gastight and possibly pressure resistant so that it can be maintained under an overpressure of the order of atmospheres.
  • heating means e.g., conduits for supply of live steam.
  • pressures and temperatures used are depending upon the nature of the gaseous bleaching agent.
  • a vertical tubular chamber 17 Connected to the inlet 13 is a vertical tubular chamber 17, in the upper part of which a breaker 19 is located. Said breaker is attached to the overhanging lower end of a vertical shaft 21 extending through a lid 23 upon said sleeve,journaled in bearings 25, 27 and driven via ropes by an electric motor 29.
  • a horizontal conduit 31 through which dense pulp with a dry' content of, e.g., l5-30 percent is fed by means of a volumetric pump 33. preferably of the kind described in the Swedish Pat. No. l95,77 1. ln the conduit 31 and after the pump there is inserted a shutting-off valve 35 in order to be able to prevent backflow during possible work stops.
  • the breaker 19 consists of a cylindrical hub 37 and a number of vanes 39 extending radially therefrom and having a series of breaking or tearing teeth 41 shaped in their outer edges. Said vanes are distributed over the cylindrical face of the hub in the axial as well as in the circumferential direction and are fastened to the hub in an oblique position so that they form an angle of, e.g., 45 with the axis of the breaker. All
  • breaking teeth are situated at about the same radial distance from the axis of rotation and move quite close to the wall of the tubular chamber 17.
  • the breaker is placed opposite to the orifice of the conduit 31 and the teeth rows overlap in the axial direction so that the entire orifice area is swept over by the breaking teeth.
  • the pulp is fed through said conduit in the shape of a compact and coherent pulp plug.
  • said plug emanates through the orifice in the wall of the verti' cal tubular chamber 17, the same is worked upon by the breaking teeth which loosen the fiber material and divide the same into flocks that are whirled around by the breaker so that they move in a helical path down through the lower part of the tubular chamber and are then spread into the container 11.
  • the pulp flocks are brought into intimate contact with the gas atmosphere so that they absorb therefrom a substantial part of the gas required for the following bleaching reaction.
  • the pulp is collected as a layer which, on account of the loose shape of the pulp, allows gas to glow therethrough in order to supply a further amount of bleaching agent to the pulp.
  • FIG. 1 shows a return conduit 45 in which a pump 43 is inserted and through which gas taken from the container is returned to the upper end of the tubular chamber 17. In this manner a faster relative movement of pulp flocks and bleaching gas is effected, which favors the penetration of the gas into the cavities of the fiber material.
  • a screen 47 serves to prevent the pulp flocks from entering said conduit 45.
  • Apparatus for bleaching cellulosic pulp which comprises a bleaching vessel, means for supplying gaseous bleaching agent to said vessel at high pressure, a vertical tubular pulp inlet at the top of said vessel, an essentially horizontal conduit with a discharge opening into the upper part of said tumbler inlet, pump means for supplying dense pulp through said horizontal conduit to said tubular inlet for discharge into said vessel, breaker means positioned in the upper part of said inlet and rotary about a vertical axis, said breaker means including breaking teeth sweeping across the entire face of said discharge opening so as to loosen pulp discharged therethrough, and means for maintaining a flow of said gaseous bleaching agent through the pulp in said inlet, said lastnamed means comprising a conduit member discharging into said tubular inlet at a point above said breaker means whereby pulp during its passage through the lower part of said inlet for discharge into the vessel is whirled around in intimate contact with the bleaching gas.
  • Apparatus according to claim I wherein the means for supplying pulp through said horizontal conduit comprise a volumetric pump 'and means for maintaining gas flow in said inlet comprises conduit means connecting the top of said vessel with the upper part of said tubular inlet above said breaker means, and pump means for pumping gaseous bleaching agent from the top of said vessel through said inlet via said conduit means.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US20760A 1969-04-03 1970-03-18 Device for feeding dense cellulosic pulp into a closed container Expired - Lifetime US3643878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE04834/69A SE326887B (enrdf_load_stackoverflow) 1969-04-03 1969-04-03

Publications (1)

Publication Number Publication Date
US3643878A true US3643878A (en) 1972-02-22

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ID=20265082

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US20760A Expired - Lifetime US3643878A (en) 1969-04-03 1970-03-18 Device for feeding dense cellulosic pulp into a closed container

Country Status (5)

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US (1) US3643878A (enrdf_load_stackoverflow)
BR (1) BR7017969D0 (enrdf_load_stackoverflow)
DE (1) DE2014855A1 (enrdf_load_stackoverflow)
FR (1) FR2042203A5 (enrdf_load_stackoverflow)
SE (1) SE326887B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1622849A (en) * 1924-07-16 1927-03-29 Ruprecht Louis Method of and machine for grinding
US1851390A (en) * 1932-03-29 Eeust kqete-kt
US2391480A (en) * 1943-01-18 1945-12-25 Us Agriculture Laboratory hammer mill
US2480998A (en) * 1944-09-07 1949-09-06 American Viscose Corp Process for disintegration of moist fibrous alkali cellulose masses
US3170647A (en) * 1956-03-21 1965-02-23 Monie S Hudson Apparatus for use in determining preservative content of wood
US3175830A (en) * 1963-02-26 1965-03-30 Int Harvester Co Single beater manure spreader

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1851390A (en) * 1932-03-29 Eeust kqete-kt
US1622849A (en) * 1924-07-16 1927-03-29 Ruprecht Louis Method of and machine for grinding
US2391480A (en) * 1943-01-18 1945-12-25 Us Agriculture Laboratory hammer mill
US2480998A (en) * 1944-09-07 1949-09-06 American Viscose Corp Process for disintegration of moist fibrous alkali cellulose masses
US3170647A (en) * 1956-03-21 1965-02-23 Monie S Hudson Apparatus for use in determining preservative content of wood
US3175830A (en) * 1963-02-26 1965-03-30 Int Harvester Co Single beater manure spreader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
BR7017969D0 (pt) 1973-01-18
DE2014855A1 (de) 1970-11-19
SE326887B (enrdf_load_stackoverflow) 1970-08-03
FR2042203A5 (enrdf_load_stackoverflow) 1971-02-05

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