Effective diffuser/thickener screen backflushing

Details Effective diffuser/thickener screen backflushing Effective diffuser/thickener screen backflushing

1987-11-27

1988-12-27

Simone, Timothy F.

Textiles: fluid treating apparatus

Machines

Liquid flowing

68184, 68190, 162 60, 162251, 210411, 8156, D21D 504

Patent

active

047931612

ABSTRACT:
The screens of a pulp treating vessel, such as a paper pulp thickener, or diffuser, are back flushed in a simple yet effective manner. The screens are mounted to a supporting conduit within a vertical vessel, and a cylinder is connected at one open end to the conduit, and the other open end is disposed within the pulp inside the vessel. A piston is mounted within the cylinder and relative movement between the piston and cylinder is effected periodically in order to force liquid from within the cylinder into the conduit and out the screens, backflushing the screens and preventing clogging. Since no additional volume of liquid is added to the vessel during backflushing, no surge occurs in the vessel. Conventional accumulators, on/off valves, and the like can be eliminated while--in the case of diffusion washing--efficiency can be increased as much as 20-30%, and capacity increased as much as about 15%.

REFERENCES:
patent: 1601091 (1926-09-01), Wayland
patent: 1605412 (1926-11-01), Williams
patent: 1857026 (1932-05-01), Ligon
patent: 3445002 (1969-05-01), Muller
patent: 3579420 (1971-05-01), Richter
patent: 3704603 (1972-12-01), Richter
patent: 3729961 (1973-05-01), Leffler
patent: 3760948 (1973-09-01), Johansen
patent: 4172037 (1979-10-01), Golston
patent: 4468319 (1984-08-01), Laakso
patent: 4529482 (1985-07-01), Richter et al.
patent: 4556494 (1985-12-01), Richter et al.
Kamyr Bulletin No. 400 DR "Kamyr Diffusion Washers", List of Installations and Applications as of Dec. 31, 1974.
Kamyr Bulletin No. 600, "For New Bleach Plants, Bleach Plant Stage Additions, New Brown Stock Washing Systems, Brown Stock Washing Improvements".

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