Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1986-12-11
1988-03-22
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
8156, 162 60, 162DIG10, D21C 902, D21C 906
Patent
active
047326514
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 washing 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 Brown Stock Washing Variable", Sep. 1978.
Luthi, "Equivalent Displacement Rati", TAPPI Proceedings, 1982: Pulping Conf., pp. 45-48.
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, Brown Stock Washing Efficiency--Displacement Ratio Method of Determination, Mar. 1954, pp. 83-89.
Blecha William E.
Lisnyansky Khaim
Alvo Steve
International Paper Company
Kennard Wayne M.
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