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Title:
METHOD FOR CONTINUOUS PRESSURE CONTROL OF VERTICAL-TYPE BOILER FOR CHOPPED CELLULOSIC FIBROUS MATERIAL
Document Type and Number:
Japanese Patent JP3623469
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a method for the continuous pressure control of a vertical- type boiler for chopped cellulosic fibrous materials, capable of maintaining the pressure inside the boiler at a desired level, and/or maintaining the liquid level inside the boiler so as to avoid nonuniform, unstable material flow in the countercurrent washing zone or at the other sites inside the boiler depending on a specific means, by the aid of the additional use of at least one circulation- dilution loop.
SOLUTION: This method for the continuous pressure control of a vertical- type boiler for chopped cellulosic fibrous materials comprises using a countercurrent washing zone with washing screen, the main extraction section and at least one set of additional extraction-dilution loops, and having such a process that the pressure inside the boiler is maintained at a desired level and concurrently, a boiler liquor is extracted from the above at least one set of additional extraction-dilution loops for avoiding a nonuniform, unstable flow of the fibrous materials in the countercurrent washing zone, and the liquor thus extracted is then charged again into the boiler.


Inventors:
Robert Jay Plow
Bruno Es. Marcocchia
Richard Oh Raxo
Karl El. Le Mans
Application Number:
JP2001236366A
Publication Date:
February 23, 2005
Filing Date:
June 01, 1995
Export Citation:
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Assignee:
Andritz Incorporated
International Classes:
D21C3/02; D21C3/22; D21C3/24; D21C7/00; D21C7/08; D21C7/12; D21C7/14; D21C9/02; D21C11/00; D21C11/04; D21G7/00; (IPC1-7): D21C7/12; D21C7/14
Domestic Patent References:
JP4300378A
JP63066390A
Attorney, Agent or Firm:
Shizuo Nakamura