Wood chip digester level control

Details Wood chip digester level control Wood chip digester level control

G - Physics

05

D

341/34

G05D 9/12 (2006.01)

Patent

CA 1079382

ABSTRACT OF THE DISCLOSURE A control system and a process is disclosed for a continuous wood chip downflow digestion system, The system maintains chip level in the top of the digester and maintains a consistency in the ratio of chips to liquor in the blowline thus allowing the system to run without constant operator attention. The system comprises a means for measuring the level of chips at the top of the digester and producing a level index over a predetermined time. This level index is compared with a preset level index and an error signal pro- duced which operates a speed control means within preset limits for a rotating scraper feeding into the blowline. There is also provided a means for measuring the feed rate of chips to the digester, and a summating means for adding a predetermined ratio setpoint for the feed rate of chips against a flow in the blowline, to an integral of the error signal above or below a preset range to produce a summated ratio. The blowline flow is then controlled within preset limits to proximate the summated ratio to the feed rate of chips.

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