Particle level sensor

Details Particle level sensor Particle level sensor

1990-11-14

1992-12-01

Alvo, Steve

Paper making and fiber liberation

Apparatus

Digester

162263, 210744, 210746, 210800, 422 8202, 436150, D21C 712

Patent

active

051677695

ABSTRACT:
A sensor for the detection of wood chip level in a digester, for example, a Kamyr digester, which consists of: (a) a probe, several meters long, vertically mounted inside the top part of the digester; (b) a series of bare metal electrodes in the side of the probe, spaced typically a few centimeters apart, and electrically insulated from the probe wall; (c) electronic circuit processing to allow any pair of electrodes to be selected, and (c) a means to allow the electrical properties of a liquor or wood chip and liquor mixture between the electrodes of a pair to be measured, and the level deduced from the measurement.

REFERENCES:
patent: 4221532 (1980-09-01), Loe, Jr.
patent: 4554051 (1985-11-01), Danforth
Rydholm "Pulping Processes", Interscience Publishers, N.Y., Sep. 1967; p. 799.
"The Distribution of Porosity in Filter Cakes", R. L. Baird et al, Proceedings of the Filtration Society, Manchester on Mar. 21, 1967, Filtration & Separation Sep./Oct. 1967, pp. 471 to 476.
American Chemical Society Conference Proceedings, Int. Symp. Water Filtration Editor, Weiler, R. A. Jawssens, J. G., 1982, "The Use of Electrical Conductivity Measurements to Elucidate the Theory of Gravity Thickening", Wakeman et al.
Proceedings EUCEPA Symposium May 11-14, 1982, Stockholm, Sweden. "Control Systems in the Pulp and Paper Industry", State of the Art in Continuous Digester Control S. O. Lundqvist et al, pp. 99-108.
Tappi, vol. 54, No. 3, Mar. 1971, pp. 368-371, R. E. Fuchs et al.
AIChE Journal, vol. 36, No. 7, Jul. 1990, pp. 1075 to 1086, B. J. Allison et al "Adaptive-Predictive Control of Kamyr Disgester Chip Level".
"Adaptive-Predictive Control of Kamyr Digester Chip Level: Industrial Results", B. J. Allison et al, 1990 Annual Meeting, pp. A275-A284.
Proceedings EUCEPA Symposium May 11-14, 1982, Stockholm, Sweden. "Kappa Number Control of Kamyr Digesters" pp. 116-125.
Proceedings EUCEPA Symposium May 11-14, 1982, Stockholm, Sweden. D. F. Church et al, pp. 126-133, "Survey on Sensor Availability and Sensor Developments for Continuous Digester Control".
Technical Section, 72nd Annual Meeting "Update 1986 The Kamyr Digester 1957-1985 What We Have Lerned".
Adaptive Filter Theory, S. Haykin, Prentice-Hall, pp. 67-76.
Rev. Sci. Instrum. 51(4) Apr. 1980, K. R. Walton, pp. 504-508, "Sensor for the Measurement of the Level and Volume of Conductive Liquids".

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