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Title
Mathematical modeling of a rotary vacuum washer used for pulp washing: A case study of a lab scale washer
Authors
V. K. Kukreja and A. K. Ray
Received
February 12, 2009
Published
Volume 43 Issue 1-3 January-March
Keywords
axial dispersion coefficient, consistency, cake thickness, dilution factor, porosity, displacement
Abstract
Mathematical models for the different zones of a rotary vacuum washer are presented in terms of their fundamental parameters. Filter performance is expressed in terms of washing liquor usage, solute removal and efficiency parameters. Laboratory experiments are performed on a combination of Indian hardwood (eucalyptus, bamboo and pine) pulp collected from a paper mill. The influence of interstitial velocity, cake thickness, Peclet number, bed porosity and dilution factor on the commonly used industrial parameters, such as washing efficiency, displacement ratio, Norden efficiency factor, is examined. The proposed model can be used in developing computer codes for online monitoring of the process.
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