The effect of operating conditions and design parameters on the dynamic behaviour of agitated pulp stock chests

TitleThe effect of operating conditions and design parameters on the dynamic behaviour of agitated pulp stock chests
Publication TypeJournal Article
Year of Publication2004
AuthorsEin-Mozaffari, F., L. C. Kammer, G. A. Dumont, and C. P. J. Bennington
JournalCanadian Journal of Chemical Engineering
Volume82
Pagination154–161
ISSN0008-4034
Abstract

Agitated pulp chests provide attenuation of high-frequency disturbances in pulp properties ahead of many pulping and papermaking unit operations. The effect of process and design variables on the extent of non-ideal flows was examined in a laboratory-scale pulp chest. Dynamic tests were made using the frequency-modulated random binary input of a brine solution with the pulp feed to determine the magnitude of non-ideal flows (channeling, recirculation and stagnant zones). Results showed that the degree of upset attenuation is a function of impeller momentum flux and fibre mass concentration and that existing design criteria underpredict the power needed to produce a fully mixed system.

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