System for presteaming wood chips at or near atmospheric pressur

Details System for presteaming wood chips at or near atmospheric pressur System for presteaming wood chips at or near atmospheric pressur

1976-02-19

1978-06-20

Fisher, Richard V.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 19, 162 61, 162 68, 162237, 162238, 162246, D21C 102, D21C 324, D21C 706, D21C 712

Patent

active

040960277

ABSTRACT:
A method and apparatus for presteaming of wood chips and the like. The chips are treated in a vertical presteaming vessel with steam under low pressure, and removal of the air from the chips is facilitated by maintaining the presteaming vessel substantially at or near atmospheric pressure. An exhaust fan, controlled by a pressure probe in the presteaming vessel, may be provided for maintaining the pressure in the vessel. The amount of air that can enter the vessel through the chips inlet is minimized by an inclined rotating screw assembly with a partial flight which elevates the packs and chips to form an isolation seal at the chips inlet into the vessel.

REFERENCES:
patent: 2858211 (1958-10-01), Durant et al.
patent: 2905240 (1959-09-01), Sandberg
patent: 3471365 (1969-10-01), Asplund
patent: 3532594 (1970-10-01), Richter
patent: 3578554 (1971-05-01), Richter
patent: 3814664 (1974-06-01), Carlsmith

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