System for cellulose pulp washing control

Paper making and fiber liberation – Apparatus – Automatic control

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162253, 162263, 8156, 68205R, D21C 902, D21C 906

Patent

active

047464054

ABSTRACT:
A method and apparatus for monitoring and controlling the operation of a counter-current pulp washing system. The dilution factor, soda loss, wash liquor ratio and displacement ratio of the washing system are determined on-line. The value of either the soda loss or of dilution factor is continuously maintained within a preselected range and changes in the value of the other variable are monitored to provide an indication of whether the washing system is operating optimally. Based on the on-line determination of displacement ratio and wash liquor ratio, the efficiency of the washers is monitored, the cause of any decrease in efficiency is identified and the appropriate control action is applied to adjust the operating parameters of the washers to compensate for changed wshing conditions or changed processing conditions.

REFERENCES:
patent: 4046621 (1977-09-01), Sexton
patent: 4096028 (1978-06-01), Rosenberger
patent: 4138313 (1979-02-01), Hillstrom et al.
patent: 4207141 (1980-06-01), Seymour
Korhonen, "Optimum for Brownstock Washing Variable" Sep. 1978.
Luthi, "Equivelent Displacement Rate" TAPPI Proceedings 1982: Pulping Conf., pp. 45-48.
South et al., "High-Efficiency Brownstock Washing Systems", TAPPI, May 1978, pp. 61-63.
De Berry, "How to Measure Washer Sodium Loss More Accurately" TAPPI, Jul. 1980, vol. 63, No. 7, pp. 123-124.
Fisher, Pulp & Paper, Computer Control Over Brownstock Washing Minimizes Production Costs, Sep. 1979, pp. 101-103.
Korhonen, Pulp & Paper, Brownstock Washing: A Review of Current Technology, Sep. 1979, pp. 104-107.
Gulley, TAPPI, Filtrate Conductivity can give Misleading Indications of Washer Losses, Mar. 1980, vol. 63, No. 3, pp. 33-34.
Luthi, TAPPI Journal, Equivalent Displacement Ratio--Evaluating Washer Efficiency by Comparison, Apr. 1983, pp. 82-84.
Perkins, et al., TAPPI, Brownstock Washing Efficiency--Displacement Ratio Method of Determination, Mar. 1954, pp. 83-89.

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