Flow control method and apparatus for continuous wood chip diges

Details Flow control method and apparatus for continuous wood chip diges Flow control method and apparatus for continuous wood chip diges

1976-05-11

1980-03-18

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 41, 162 42, 162 60, 162237, 162248, 162249, 162251, D21C 714

Patent

active

041938399

ABSTRACT:
A method and apparatus for screenless treatment of cellulose fiber material without channeling of treatment liquid through a fiber material column being treated. An inner vertical vessel extends into an outer vertical vessel which has a larger diameter than the inner vessel, and an annular space in the outer vessel is defined by a portion of the inner vessel extending into the outer vessel. At least three baffles extend through the annular space into the area of the outer vessel below the inner vessel to define at least three distinct flow areas, and an outlet nozzle is provided in each of the flow areas. Liquid is withdrawn from the annular space through at least two of the flow areas, while liquid is backflushed into one of the flow areas.

REFERENCES:
patent: 2828017 (1958-03-01), Ronningon et al.
patent: 3268923 (1966-08-01), Burling
patent: 3298899 (1967-01-01), Laakso
patent: 3434920 (1969-03-01), Green
patent: 3814664 (1974-06-01), Carlsmik
patent: 3941650 (1976-03-01), Schnyder
patent: 3985005 (1976-10-01), Leffler
patent: 3992248 (1976-11-01), Hurter

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