Chip presteaming and air washing

Details Chip presteaming and air washing Chip presteaming and air washing

1986-09-17

1988-05-24

Chin, Peter

Paper making and fiber liberation

Apparatus

34168, 34176, D21C 102

Patent

active

047464046

ABSTRACT:
A method and apparatus are provided for effecting prestreaming and deaeration of wood chips, or like comminuted cellulosic fibrous material. Presteaming takes place in a vertical presteaming vessel, utilizing a plurality of uniformly radially spaced nozzles adjacent the bottom of the vessel, a plurality of generally uniformly radially spaced steam introduction pipes in a central portion of the vessel, and a pair of synchronized rotating valves for feeding steam to the introduction nozzles and pipes in a coordinated manner. After presteaming, the chips pass through a chips meter to a vertical chute in which they are entrained in liquid, and then pass to a horizontal deaerating vessel. In the deaerating vessel, deaerated liquid is passed in a path generally perpendicular to the path of the material flowing through the deaeration vessel. The deaerated material discharged from the deaeration vessel passes through a vertical chute to a conventional high pressure feeder, and then is subsequently passed to the top of a continuous digester.

REFERENCES:
patent: 850384 (1907-04-01), Mallam
patent: 3201307 (1965-04-01), Horstman
patent: 3270437 (1966-09-01), Lara et al.
patent: 3525665 (1970-08-01), Gessner
patent: 3681192 (1972-08-01), Reinhall

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