Apparatus for controlling the degree of cooking in a digester

Paper making and fiber liberation – Apparatus – Digester

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162DIG10, 364471, D21C 712

Patent

active

049902199

ABSTRACT:
A method and apparatus for controlling the delignification process by monitoring and minimizing variations in the Kappa Number and the digester residual chemical concentration. A parameter representative of the H factor for the delignification process and a measurement of the initial chemical concentration are utilized to produce signals representative of the actual Kappa Number and the residual acid concentration in the digester. The expected perturbations in Kappa Number and the residue chemical concentration are compared with target values for same to produce estimated errors due to mismatch which are compared with actual measured errors for these parameters to produce compensated control errors for same. The compensated control errors are utilized to modify the target values for the H factor and the initial chemical concentration by modifying the chemical charge and the time versus temperature operating parameters of the digestings to regulate pulp Kappa number and spent cooking liquor residual chemical concentrations of the process.

REFERENCES:
Hatton, "Application of Empirial Equations to Kraft Process Control", TAPPI, vol. 56, No. 6, Aug. 1973, pp. 108-111.
Vroom, "The H Factor: A Means of Expressing Cooking Times and Temperatures as a Single Variable", Pulp & Paper Canada, Jun. 1957.
"Pulp Plant to Get Closed-Loop Computer Control", Chemical Engineering, Jun. 10, 1963, pp. 90-92.

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