Apparatus for automated monitoring of pulp retention time using

Details Apparatus for automated monitoring of pulp retention time using Apparatus for automated monitoring of pulp retention time using

1998-01-16

2000-01-25

Alvo, Steven

Paper making and fiber liberation

Apparatus

Digester

162259, 162263, D21C 712

Patent

active

06017420&

ABSTRACT:
An automated tracer system and method for measuring the residence time of wood pulp as it moves through various stages of processing in a pulp mill. A tracer compound comprising a neutral salt of a halogen is introduced into a first location in the path of the pulp slurry; at a second location an automated detector detects the concentration of tracer compound over a time period; a controller relays a voltage signal from the detector to a processor which uses a calibration curve to integrate tracer concentration over time and thereby derive pulp residence, between the first and second locations.

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patent: 4946555 (1990-08-01), Lee et al.
patent: 5034095 (1991-07-01), Kido et al.
Vernon B. Bodenheimer, "Channeling in Bleach Towers and Friction Losses in Pulp Stock Lines", Southern Pulp and Paper Manufacturer, pp. 42-44, & 46 (1969).
J.K. Perkins, "Channeling in Continuous Bleaching Cells" (Pulp Behavior Patterns in Bleach Towers), A talk given at Gulf Coast Section TAPPI, pp. 191-198 (1971).
Carlton W. Dence, et al., "Chlorination --The Bleaching of Pulp", Third Edition, Revised, TAPPI Press, pp. 29 & 62.
George Tchobanaglous, et al., "Wastewater Engineering - Treatment, Disposal & Reuse", McGraw-Hill, Inc., Third Edition, pp. 1214-1216 (1991).
Manual for Orion Electrode, Orion Research Incorporated Laboratory Products Group, pp. 2-29 (1991).

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