Digester temperature distribution control system

Details Digester temperature distribution control system Digester temperature distribution control system

D - Textiles, Paper

21

C

D21C 7/12 (2006.01) G01K 11/32 (2006.01) G05D 23/19 (2006.01)

Patent

CA 2122533

A digester temperature distribution control system comprises an optical fiber type temperature measuring unit utilizing the Raman scattering effect, reference temperature measuring unit, reference point temperature setting unit, measured temperature distribution calcu- lating unit, target temperature distribution calculating unit and control unit. The optical fiber type tem- perature measuring unit is provided in that digester charged with chips and equipped with control valves for controlling steam for heating the charged chip mass in the digester and is adapted to detect temperature at a plurality of points in a length thereof including a given reference point in the digester. The control unit controls the control valves so as to allow a difference between a measured temperature distribution obtained through the optical fiber type temperature measuring unit, reference temperature measuring unit, reference temperature setting unit and measured temperature distribution calculating unit and a target temperature distribution obtained through the target temperature distribution calculating unit to be set in a range of a preset value.

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