STYRNINGSFOERFARANDE FOER TILLVERKNING AV CELLULOSA, FOER ATT OEKA CELLULOSANS BROTTHAOLLFASTHET OCH UTVINNING GENOM STYRNING AV TRYCK OCH TEMPERATUR

摘要

In the first phase (T1) of digestion during heating, the suspension of wood pulp and digestion liquor is subjected to the highest possible pressure (p(T1)) ("impregnation pressure"). In the second phase (T2) of the digestion at the final digestion temperature (TM(T2)), the pressure is lowered (p(T2)) ("digestion pressure"). If desired, the final digestion temperature (T(T2)) in the second phase (T2) of digestion is additionally limited when the yield of finished pulp, which is to be expected, having a desired value of tearing strength (R) at the end of the digestion decreases. In this way, the "controllability" of the digestion process can be improved. Advantageously, a program-controlled computer with a fuzzy controller is provided for carrying this out. Preferably, a neuronal network is additionally present in parallel thereto. IMAGE