Continuous digester system

Details Continuous digester system Continuous digester system

2011-01-11

2011-01-11

Halpern, Mark (Department: 1741)

Paper making and fiber liberation

Apparatus

Digester

C162S239000, C162S246000, C162S250000

Reexamination Certificate

active

07867363

ABSTRACT:
In a continuous digester system the digester system is greatly simplified by using a single vertical atmospheric vessel, replacing the conventional chip bin, steaming vessel, chip chute, high pressure pumping or sluice feeders, impregnation vessels and top separator. Chips are simply fed to the top of the atmospheric vessel, and a chip level is established in the vessel. Treatment liquids are added to the vessel such that a total liquid volume (Z1+Z2) with a liquid level (LIQ LEV) is established under the chip level (CH LEV). Impregnation stage and subsequent cooking stages are implemented in the atmospheric vessel at successively increasing temperature and depths into the total liquid volume, thus preventing boiling in the stages and preferably reducing steam blow trough of the chip surface in the top of the vessel.

REFERENCES:
patent: 3303088 (1967-02-01), Gessner
patent: 3380883 (1968-04-01), Richter et al.
patent: 3532594 (1970-10-01), Richter
patent: 5635025 (1997-06-01), Bilodeau
patent: 7381302 (2008-06-01), Snekkenes
patent: 2005/0061458 (2005-03-01), Snekkenes et al.
patent: 2007/0187053 (2007-08-01), Snekkenes et al.

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