Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1977-05-02
1979-02-27
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 49, 162 52, 162238, 162243, 162246, 162262, 162263, 364110, 364116, 364509, 364551, 364562, D21C 706, D21C 708, D21C 712
Patent
active
041417844
ABSTRACT:
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 produced 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.
REFERENCES:
patent: 2938824 (1960-05-01), Richter
patent: 3617717 (1971-11-01), Smith
patent: 3650890 (1972-03-01), Kamio
patent: 3746843 (1973-07-01), Wesner
patent: 3898124 (1975-08-01), Olson
Fuchs et al., "Advances in Computer Control of Kamyr Continuous Digesters," Tappi; vol. 59, No. 2, Feb. 1976, presented Sep. 9-1975, (pp. 96-99).
Fuchs et al., "Blow Flow Control of Continuous Digesters," Tappi, vol. 54, No. 3; Mar. 1971, (pp. 368-371).
Fox; "Control Strategy;" Tappi, May 1966; vol. 49, No. 5, (pp. 87A-89A), May 1966.
Isner Andrew B.
Lofkrantz John E. E.
Alvo Steve
Bashore S. Leon
MacMillan Bloedel Limited
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