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Title:
METHOD FOR CONTINUOUS PULP PRODUCTION BY COLUMN-LIKE VESSEL TYPE CONTINUOUS DIGESTER
Document Type and Number:
Japanese Patent JP2004353108
Kind Code:
A
Abstract:

To prevent occurrence of chip hanging (unsmooth drop of raw material chip) during pulp production by a column-like vessel type continuous digester.

In the column-like vessel type continuous digester having constitution that in a vessel supplied with a ground lignocellulose substance and cooking liquor from the top part, a penetration zone A, a digesting zone B and a cleaning zone C are formed from the upper position, black liquor is extracted from an extraction strainer 4 arranged at the middle stage part of the vessel and a cellulose component is taken out from an outlet device 6 installed at the lower stage part of the vessel, the digester is equipped with an upper part circulation line L6 for refluxing a part of cooking liquor from an upper part circulation strainer 2 laid at a boundary part between the penetration zone A and the digesting zone B to the top part of the vessel, a part of the liquor Z6 is taken out from the upper part circulation line and sent to a recovery process line for cooking liquor so that a liquid ratio in the vessel is controlled and occurrence of chip hanging in the continuous digester is prevented.


Inventors:
AI BAN TORAN
Application Number:
JP2003150012A
Publication Date:
December 16, 2004
Filing Date:
May 28, 2003
Export Citation:
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Assignee:
DAIO SEISHI KK
International Classes:
D21C3/22; (IPC1-7): D21C3/22
Attorney, Agent or Firm:
Hiroshi Ohama