Paper making and fiber liberation – Apparatus – Digester
Patent
1989-11-01
1991-02-05
Alvo, Steve
Paper making and fiber liberation
Apparatus
Digester
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.
Beller Jeffrey A.
Johnson Ralph K.
Kammerer Roger
Kaya Azmi
Keyes, IV Marion A.
Alvo Steve
Edwards Robert J.
Elsag International B.V.
Kalka Daniel S.
Matas Vytas R.
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