Control of chemical dosage to a pulp slurry

Details Control of chemical dosage to a pulp slurry Control of chemical dosage to a pulp slurry

1992-06-16

1994-04-26

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 61, 162 62, 436 55, D21C 300

Patent

active

053063910

ABSTRACT:
A method is disclosed for controlling a desired chemical dosage to a stream of cellulosic pulp heated by the addition of steam wherein the pulp flow rate is determined indirectly by measuring the pulp temperature after steam addition and calculating the pulp flow rate by heat balance. Changes in pulp flow rate are reflected by changes in pulp temperature at known steam addition rates, and the chemical flow rate is adjusted accordingly to maintain constant chemical dosage. The method is particularly useful in controlling oxygen dosage in oxygen delignification and bleaching processes.

REFERENCES:
patent: 3650890 (1972-03-01), Kamio
patent: 3745065 (1973-07-01), Niilo-Rama
patent: 4540468 (1985-09-01), Genco et al.
patent: 4717672 (1988-01-01), Fleming et al.
patent: 4946555 (1990-08-01), Lee et al.
Cirucci, J. F.; "Optimizing Oxygen Extraction By Vent Gas Analysis: Process Control and Safety"; Jul. 1986; Tappi Journal, pp. 94-97
US Appl. Ser. No. 07/797,866; Cirucci, et al.; filed Nov. 26, 1991; "Application of Oxygen and Steam in Pulp Using Ejectus".

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