D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/56
D21C 7/12 (2006.01)
Patent
CA 1058929
METHOD AND APPARATUS FOR DETERMINING THE LOCATION OF THE CHIP LEVEL IN A PULPING DIGESTER Abstract A pulping digester contains a liquid digesting medium and wood chips dispersed in the medium. The level of the wood chips in the digester is normally below the top of the digester. As chips and digesting medium are fed to the digester and as pulp and digesting medium are withdrawn from the digester, the chip level will vary dependent upon the net addition of chips and withdrawal of pulp. The variable location of the chip level, or chip height, is determined by positioning a temperature sensing means in the upper portion of the digester above the normally desired chip level. The temperature sensed by the sensing means is displayed to and monitored by the digester operator. As the chip level rises toward the temperature sensor, the sensed temperature will fall until the chip level rises above the location of the temperature sensor, after which the sensed temperature will rapidly increase as the chip level continues to rise above the location of the sensing means. The inverse relationship is true as the chip level falls, providing a characteristic curve of temperature versus chip level from which the chip height can be determined.
286892
Loe Alton L. Jr.
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