Continuous vertical digester apparatus

Details Continuous vertical digester apparatus Continuous vertical digester apparatus

1988-05-31

1994-04-05

Alvo, Steve

Paper making and fiber liberation

Apparatus

Digester

162251, D21C 706, D21C 714

Patent

active

053001958

ABSTRACT:
In the continuous cooking of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, the material is subjected to a minimum of mechanical action, especially under high temperature and pressure conditions, so as to increase the quality of the pulp. Also, even for large digesters the uniformity of treatment is enhanced, and scaling may be reduced while energy efficiency is increased. Material is fed without significant steaming to a feeder screw within a perforated cylinder mounted at the bottom of an impregnation vessel. The material flows upwardly in the impregnation vessel, with screens adjacent the top of the vessel thickening the slurry before it is discharged into the top of a continuous digester. The discharge from the impregnation vessel to the continuous digester is made with a minimum of mechanical action on the pulp. The impregnation vessel may be disposed within, and concentric with, the digester, or it may located exteriorly of the digester and supply more than one digester. Conduits mounted on the exterior of the impregnation vessel, when concentric with the digester, can supply treatment liquid at various locations along the height of the digester.

REFERENCES:
patent: 2858211 (1958-10-01), Durant et al.
patent: 3471366 (1969-10-01), Reinhall
patent: 3530034 (1970-09-01), Erikson
patent: 3743572 (1973-07-01), Richter
patent: 3843468 (1974-10-01), Laakso
patent: 3849247 (1974-11-01), Richter
patent: 3963561 (1976-06-01), Richter
patent: 4093511 (1978-06-01), Richter
patent: 4637878 (1987-01-01), Richter et al.
Kamyr Pulp Equipment publication; Feb., 1972; pp. 8 through 43; Illustration of conventional prior art digesters, pp. 1 through 5.

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