Performance and design of agitated pulp stock chests

TitlePerformance and design of agitated pulp stock chests
Publication TypeJournal Article
Year of Publication2003
AuthorsEin-Mozaffari, F., G. A. Dumont, and C. P. J. Bennington
JournalAPPITA Journal

The chief purpose of agitated pulp stock chests is to reduce high frequency variability in pulp properties. Dynamic tests made on industrial stock chests have shown that mixing is far from ideal: channelling, recirculation and dead zones decrease the degree of upset attenuation. A scale-model stock chest has been built to study macroscale mixing and disturbance attenuation in a laboratory setting. The variables studied include chest dimensions, impeller speed and diameter, and suspension mass concentration. Initial tests in batch-mode confirmed established trends for chest behaviour, although existing literature correlations underpredict the power and momentum flux requirements needed for agitation at the laboratory scale. Tests have also shown that a liquid phase tracer (saline solution) can be used to trace the fibre phase provided the suspension mass concentration is less than or equal to 2%. The batch mixing-time was found to be a function of suspension mass concentration and impeller momentum flux.

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