Atmospheric pre-steaming chip bin vacuum and pressure relief dev

Details Atmospheric pre-steaming chip bin vacuum and pressure relief dev Atmospheric pre-steaming chip bin vacuum and pressure relief dev

1991-09-03

1992-12-08

Jones, W. Gary

Paper making and fiber liberation

Apparatus

Digester

34 15, D21C 706

Patent

active

051694980

ABSTRACT:
The proper pressure conditions are maintained within an atmospheric pre-steaming chips bin used in the production of paper pulp. Extending upwardly from the top of the chips bin is a vertical section of conduit, an elbow section, and a horizontal section. A door guide with a door opening in it is disposed in the horizontal section and precludes passage of gas through the horizontal section except through the door opening. A pivot pin mounts a door at its top so that it normally assumes a vertical orientation closing off the opening, and it is adjustably biased into that orientation by a counterweight mechanism. The counterweight includes weight discs which mount on a vertical section of rod having external screw threads, and a horizontal section of rod is connected by a flange to a flange of the pivot pin. The door remains closed unless the pressure differential between the chips bin and the surrounding environment is greater than about 2 psig, in which case gas may flow from the environment to the chips bin, or vice versa, to bring the pressure differential within the desired range.

REFERENCES:
patent: 2624513 (1953-01-01), Field
patent: 3739484 (1973-06-01), Wilkening et al.
patent: 4124440 (1978-11-01), Sherman

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