Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Charging and/or discharging fibrous material
Patent
1995-04-25
1997-04-22
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Charging and/or discharging fibrous material
162238, 162246, 162248, D21C 706, D21C 708
Patent
active
056225989
ABSTRACT:
A system for feeding wood chips entrained in cooking liquor to a high pressure feeder connected to a continuous digester includes a vertical treatment (e.g. steaming) vessel, a metering device connected to the discharge from the steaming vessel, a generally vertical chip chute extending downwardly from the metering device, and a slurry pump having an inlet. The slurry pump pumps the slurry from an outlet thereof to a high pressure feeder low pressure inlet. In order to minimize the effect of changes in liquid volume upon the operation of the system, and to provide separate control of liquor volume and chip volume, a substantially vertical liquor tank having a top and bottom the bottom including a discharge opening above the slurry pump inlet is provided. A conduit directly connects the liquor tank discharge opening with the slurry pump inlet. A pressure isolating device may be used in the system if it is to operate at superatmospheric pressure rather than atmospheric pressure.
REFERENCES:
patent: 3303088 (1967-02-01), Gessner
patent: 4032391 (1977-06-01), Moked et al.
patent: 4372711 (1983-02-01), Richter et al.
patent: 4958741 (1990-09-01), Johanson
patent: 5236285 (1993-08-01), Prough
patent: 5236286 (1993-08-01), Prough
Ahlstrom Machinery Inc.
Czaja Donald E.
Nguyen Dean T.
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