Sulfite digester rate of delignification system

Details Sulfite digester rate of delignification system Sulfite digester rate of delignification system

D - Textiles, Paper

21

C

9/13, 354/21

D21C 3/06 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1198858

SULFITE DIGESTER RATE OF DELIONIFICATION SYSTEM ABSTRACT OF THE DISCLOSURE A method and apparatus determines the degree of cooking in a sulfite digester used for delignification. The digester temperature and pressure is sensed and utilized in a unit com- prising a plurality of function blocks to calculate digester reaction rate according to the Arrhenius equation. This output is multiplied by a value proportional to the partial pressure of sulfur dioxide in the digester to obtain a delignification rate value. The delignification rate value is integrated over time to determine the degree of cooking or Kappa Number. This number is compared to a desired set point value for the Kappa Number. When the actual Kappa number reaches the desired set point, a signal is produced which is provided to an operator. Function blocks spread over two controller modules are utilized to achieve the needed calculations in a simple manner without the use of an analog or digital computer. - 12 -

441793

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