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We developed “Kappa-number control system” of Kamyr kraft pulp continuous digester which have two kinds of linear form regression model for softwood and hardwood chips that control circulation temperature of cooking zone to stabilize Kappa number quality at Kure mill. Those models consist of II factor and residual EA [effective alkali] terms etc. and constant terms. The constant terms are modified to match with secular fluctuations by using exponential smoothing method.Furthermore complicated operations of changing chip species frequently is executed in this digester and many control elements have to change adequately according to appropriate schedule to maintain pulp quality stable during the disturbance operation. For its purpose we developed “wood species change” and “production rate change” control system which change a series of operations automatically.

K-No Control and Wood Species Change Control for Kamyr Continuous Digester.