Bleaching tower for gas phase bleaching

Details Bleaching tower for gas phase bleaching Bleaching tower for gas phase bleaching

1973-12-20

1978-04-18

Fisher, Richard V.

Paper making and fiber liberation

Apparatus

Digester

68181R, 162246, D21C 910, D21C 708, D21C 712

Patent

active

040850021

ABSTRACT:
An improved tower for gas-phase bleaching of cellulose pulp at high pulp consistency including in series a gas zone space beneath said gas zone for a column of fibrous material, a mixing zone and a dilution zone, wherein a hub body is located centrally at the bottom of the tower and provided with driving means for rotation of the shaft bearing the hub body, and the torque required for rotating the hub body is continuously measured. The rate of dilution liquid is varied inversely with variation in torque thereby maintaining substantially constant the consistency of the diluted fibrous material as withdrawn from the bottom of the tower. The height of the pulp column is measured and kept constant by controlling the withdrawal of diluted fibrous material.

REFERENCES:
patent: 2938824 (1960-05-01), Richter
patent: 3434920 (1969-03-01), Green
patent: 3519532 (1970-07-01), Sutherland
patent: 3579421 (1971-05-01), Richter
patent: 3586600 (1971-06-01), Rich et al.
Morrison, "Changes in Kraft Continuous Digester Instrumentation", Paper Trade Journal, 9/14/64, pp. 47-51.
Fox, "Control Strategy", TAPPI, May 1966, vol. 49, No. 5, pp. 87A-89A.

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