Computerization of the Continuous “Kamyr” Sulphite Pulp Process Control

Abstract

Summary The cooking process control of the “Kamyr” reactors with the application of a computer permits to maintain the preset proporties of the kraft pulp at most economical technological conditions. Such a system is based on a mathematical model of the process obtained on hand of a physical model with the use of the factorial and simplex experiment planning methods expressed in the form of an equation system of the first and second order. In-site checking of the process model showed In-sit with sufficient accuracy the quantity relationship of the wood pulp yield, the residual lignin content, the cocking degree and the mechanical properties of the pulp versus the main sulphate cooking variables: the cooking temperature curve, the liquor-towood ratio, the active alkali, the proportion of the coniferous and hardwood species and the white liquor sulfidity. The synthesized control system functions on the principle of compensating the influence of the measurable input disturbances and the application of the feedback for compensating the immeasurable disturbances. In-site tests of the system at the Kotlass pulp and paper mill with the application of a computer to control the operation of the “Kamyr” digester producing 425 tpd kraft pulp for bag paper showed the efficiency of the developed system.