US3787284A - Device for discharging cellulosic pulp from a digester - Google Patents

Device for discharging cellulosic pulp from a digester Download PDF

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Publication number
US3787284A
US3787284A US00264240A US3787284DA US3787284A US 3787284 A US3787284 A US 3787284A US 00264240 A US00264240 A US 00264240A US 3787284D A US3787284D A US 3787284DA US 3787284 A US3787284 A US 3787284A
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United States
Prior art keywords
digester
partition
shell
pulp
calotte
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Expired - Lifetime
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US00264240A
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English (en)
Inventor
J Richter
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.)
Metso Fiber Karlstad AB
Original Assignee
Kamyr AB
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Publication date
Application filed by Kamyr AB filed Critical Kamyr AB
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Publication of US3787284A publication Critical patent/US3787284A/en
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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
    • D21C7/00—Digesters
    • D21C7/08—Discharge devices

Definitions

  • Each scraper device comprises a radially directed inclined shaft extending through the digester shell and said partition, said shaft carrying scraper arms sweeping the inside of a calotte-shaped portion of said partition as well as scraper arms sweeping the inside of a hemispherical bottom portion of the digester shell.
  • the invention relates to a device for discharging of cellulosic pulp from the lower end of a digester provided with a partition which is concentric to the digester shell and'which separates a central zone from a peripheral zone of the digester cross-section, and in which digester the space inside said partition communicates with a first pulp outlet and the space between the partition and the digester shell communicates with a second pulp outlet.
  • the essentially characterizing feature of the invention consists in that rotary scraper means active inside the partition are attached to a radial, outwardly and downwardly directed shaft extending through the digester shell as well as through the partition, said shaft also carrying scraper means active in the space be-v tween the partition and the digester shell.
  • the operation of the central and the peripheral scraper by means of a common shaft involves a considerable simplification of the bearing and sealing problems, even when considering that for sweeping over a sufficiently great part of the bottom surface usually at least three double sets of scrapers are required, one drive shaft being provided for each set.
  • FIG. 1 diagrammatically shows a vertical and axial cross-section of the lower part of a continuous cellulose digester provided with the discharging device of the present invention
  • FIG. 2 is a top plan view along the line IIII of FIG. 1. 1 v
  • the shown digester is of the type wherein it is desirable to separate the shell pulp, that during the continuous passage of the pulp in the longitudinal direction of the digester has moved close to the cylindrical shell ll of the digester, from the core pulp that has moved closer to the axis of the digester and formed a central core in the continuously descending pulp column.
  • the shell pulp and the core pulp usually are of different qualities, for instance on account of different treatment or different'starting material.
  • the digester In order to separate the two pulp kinds in connection with their discharge from the digester, the digester is provided with a first outlet 13 communicating with the peripheral zone B of a cross-section of the lower-most portion of the digester, and with a second outlet 15 communicating At the level where the shell 11 merges into the spherical bottom portion 17 the two kinds of pulps in the zones A and B are separated from each other during their descent on opposite sides of the uppermost, preferably pointed edge of the stationary partition 23 inserted in the'lower end of the digester.
  • This partition is calotte-shaped and is concentric to the spherical portion 17 of the'digester shell but is of a smaller radius, so that between the partition 23 and the digester shell 17 there is formed an annular space 25 of uniform width.
  • the calotte'shaped partition 23 is joined to a cylindrical centrally located neck 27.
  • the horizontally directed outlet 15 is connected to said neck via an inclined conduit 29 penetrating the bottom 21.
  • Each scraper device includes a shaft 33 driven by a motor 31 and extending through the spherical part 17 of the digester bottom as well as through the partition 23.
  • This shaft carries a first set of scraper means 35 operating in the space 25 and a second set of scraper means 37 operating in the central space inside the partition 23.
  • the scraper means of each set may consist of two or more radially directed or curved arms connected to the shaft.
  • the shaft 33 is directed radially to the spherical faces and at an angle of 40-50 to the vertical axis of the digester.
  • Each of said scraper means 35, 37 is of a length taking up an angle of 2535, as seen from the centre of the spherical faces, so that together they sweep great areas of the digester bottom and of the partition, respectively.
  • a number of spray tubes 39, 41 for the supply of the dilution liquid which tubes are distributed around the circumference of the digester.
  • the spray tubes 4ll which have their orifices on the inside of the partition 23 close to its upper edge, extend radially across the interspace 25 and are attached to the partition 23 so that the latter is propped by said tubes and is securely held in its correct position truly concentric to the digester shell.
  • the drawing shows a stationary central tube 43 extending into the digester through the neck 27.
  • This tube can be used for supplying chips, digesting liquor or washing liquid to the digester.
  • said tube may be rotary and carry agitators or spray nozzles.
  • a cellulose digester having a shell with a cylindrical main portion and an approximately calotte-shaped bottom portion and a device for discharging cellulosic pulp from the lower end of the digester
  • a partition concentric t the digester shell and separating a central zone from a peripheral zone of the digester cross-section so that the space inside said partition communicates with a first pulp outlet and the space between the partition and the digester shell communicates with a second pulp outlet
  • s'aid partition being shaped approximately as a spherical calotte or zone concentric to the approximately calotte-shaped bottom portion of the digester, the upper part of the partition being propped by radially directed tubes for the supply of diluting liquid extending through the digester shell and partition for communication with the space inside said partition and at least three rotary scraper means inside the partition, each rotary scraper means being attached to a radially, outwardly and downwardly directed shaft which extends through the partition and the digester shell, said shaft also carrying scraper means in the space between the partition
  • a cellulose digester comprising a shell having a cylindrical main portion and a substantially calotteshaped bottom portion, a partition located concentrically in the digester and having a calotte-shaped portion concentric to said digester shell bottom portion, the upper part of the partition being propped by radially directed tubes for the supply of diluting liquid extending through the digester shell and partition for communication with the space inside said calotteshaped partition, a first pulp outlet, a second pulp outlet, means connecting said first pulp outlet to the space inside said calotte-shaped partition, means connecting said second pulp outlet to the space between said partition and said digester shell bottom portion, at least three sets of scraper devices distributed around the circumference of the digester bottom, each of said sets comprising a drive shaft directed radially and at an acute angle to the axis of the digester and extending through said partition and through said digester shell bottom portion, scraper arms attached to said shaft in positions suitable for sweeping the inside of said calotte-shaped partition and forwarding pulp towards said first pulp outlet, and scraper arms attached to said shaft in positions suitable

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US00264240A 1971-06-22 1972-06-19 Device for discharging cellulosic pulp from a digester Expired - Lifetime US3787284A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8073/71A SE344603B (enrdf_load_stackoverflow) 1971-06-22 1971-06-22

Publications (1)

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US3787284A true US3787284A (en) 1974-01-22

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US00264240A Expired - Lifetime US3787284A (en) 1971-06-22 1972-06-19 Device for discharging cellulosic pulp from a digester

Country Status (4)

Country Link
US (1) US3787284A (enrdf_load_stackoverflow)
FI (1) FI54718C (enrdf_load_stackoverflow)
FR (1) FR2143264B2 (enrdf_load_stackoverflow)
SE (1) SE344603B (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213822A (en) * 1978-10-12 1980-07-22 Eriksson Erik S Apparatus for displacement washing of fibrous material suspended in a liquid
US4274913A (en) * 1978-05-23 1981-06-23 Toyo Pulp Co., Ltd. Process for producing alkali pulp
US4432836A (en) * 1979-07-30 1984-02-21 Kamyr, Inc. Vessel false bottoming
US4716021A (en) * 1985-07-17 1987-12-29 Japan Styrene Paper Corp. Heat treatment apparatus for polyolefin resin particles
US5203630A (en) * 1992-02-06 1993-04-20 General Signal Corp. Side entry fluid mixing
US5538597A (en) * 1990-09-05 1996-07-23 A. Ahlstrom Corporation Apparatus for the discharge of a mass tower
US5589036A (en) * 1992-05-18 1996-12-31 Champion International Corporation Controlling pulp flow in an upflow pulp treatment tower
US5711600A (en) * 1994-06-09 1998-01-27 Ahlstrom Machinery Corporation High consistency pulp tower with a parting member and the introduction of dilution liquid
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester
US20040233780A1 (en) * 2002-10-25 2004-11-25 De Oliveira Picho Helton Mendes Disposal for agitator tank
US20060137839A1 (en) * 2003-02-12 2006-06-29 Sulzer Pumpen Ag Arrangement for and a method of treating pulp, and a method of modernizing a pulp tower
US20180360270A1 (en) * 2015-12-10 2018-12-20 Adiamas Food preparation device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3222141A (en) * 1960-03-23 1965-12-07 Kaiser Aluminium Chem Corp Digesting apparatus
US3475271A (en) * 1966-02-07 1969-10-28 Kamyr Ab Cellulose digester with washing apparatus
US3579421A (en) * 1967-05-16 1971-05-18 Kamyr Ab Continuous cellulose digester with two separate pulp outlets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3222141A (en) * 1960-03-23 1965-12-07 Kaiser Aluminium Chem Corp Digesting apparatus
US3475271A (en) * 1966-02-07 1969-10-28 Kamyr Ab Cellulose digester with washing apparatus
US3579421A (en) * 1967-05-16 1971-05-18 Kamyr Ab Continuous cellulose digester with two separate pulp outlets

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274913A (en) * 1978-05-23 1981-06-23 Toyo Pulp Co., Ltd. Process for producing alkali pulp
US4213822A (en) * 1978-10-12 1980-07-22 Eriksson Erik S Apparatus for displacement washing of fibrous material suspended in a liquid
US4432836A (en) * 1979-07-30 1984-02-21 Kamyr, Inc. Vessel false bottoming
US4716021A (en) * 1985-07-17 1987-12-29 Japan Styrene Paper Corp. Heat treatment apparatus for polyolefin resin particles
US5538597A (en) * 1990-09-05 1996-07-23 A. Ahlstrom Corporation Apparatus for the discharge of a mass tower
US5203630A (en) * 1992-02-06 1993-04-20 General Signal Corp. Side entry fluid mixing
US5589036A (en) * 1992-05-18 1996-12-31 Champion International Corporation Controlling pulp flow in an upflow pulp treatment tower
US5711600A (en) * 1994-06-09 1998-01-27 Ahlstrom Machinery Corporation High consistency pulp tower with a parting member and the introduction of dilution liquid
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester
US20040233780A1 (en) * 2002-10-25 2004-11-25 De Oliveira Picho Helton Mendes Disposal for agitator tank
US20060137839A1 (en) * 2003-02-12 2006-06-29 Sulzer Pumpen Ag Arrangement for and a method of treating pulp, and a method of modernizing a pulp tower
US7622018B2 (en) * 2003-02-12 2009-11-24 Sulzer Pumpen Ag Arrangement for and a method of treating pulp, and a method of modernizing a pulp tower
US20180360270A1 (en) * 2015-12-10 2018-12-20 Adiamas Food preparation device

Also Published As

Publication number Publication date
FR2143264A2 (enrdf_load_stackoverflow) 1973-02-02
SE344603B (enrdf_load_stackoverflow) 1972-04-24
FI54718B (fi) 1978-10-31
FR2143264B2 (enrdf_load_stackoverflow) 1973-07-13
FI54718C (fi) 1979-02-12

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