Paper making and fiber liberation – Apparatus – Digester
Patent
1994-04-28
1996-08-20
Czaja, Donald E.
Paper making and fiber liberation
Apparatus
Digester
162252, 162263, 162233, D21C 712, D21C 710, D21C 700
Patent
active
055475450
ABSTRACT:
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 calculating unit, target temperature distribution calculating unit and control unit. The optical fiber type temperature 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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patent: 4800266 (1989-01-01), Poorman
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patent: 5028146 (1991-07-01), Wada
patent: 5222810 (1993-06-01), Kleinerman
patent: 5236554 (1993-08-01), Greenwood
"Multipoint Temperature Monitoring in a Hazardous Environment", Massime Brenci et al., Jan. 29-31, 1992, 8th Optical Sensors Conference, IEEE lasers and Electro-Optics Society and Optical Society of America, pp. 97-100.
Paper Trade Journal, pp. 47-51, Sep. 14, 1964, Donald M. Morrison, "Changes in Kraft Continuous Digester Instrumentation".
Electrical Review, vol. 255, No. 16, "Finding Fault with Cables", pp. 29-33, Aug. 21-Sep. 3, 1992.
Egi Hiroshi
Toyama Kazuhisa
Czaja Donald E.
Fortuna Jos'e A.
Kabushiki Kaisha Toshiba
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