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Titolo:
Ease of control of imperfectly mixed continuous DTB crystallizers
Autore:
Hamamura, T; Nagata, H; Sotowa, K; Hasebe, S; Hashimoto, I;
Indirizzi:
Kyoto Univ, Dept Chem Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 niv, Dept Chem Engn, Kyoto 6068501, Japan
Titolo Testata:
KAGAKU KOGAKU RONBUNSHU
fascicolo: 3, volume: 27, anno: 2001,
pagine: 359 - 366
SICI:
0386-216X(200105)27:3<359:EOCOIM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
JPN
Keywords:
crystallizer; control; compartment model; crystal size distribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Hamamura, T Kyoto Univ, Dept Chem Engn, Kyoto 6068501, Japan Kyoto Univ Kyoto Japan 6068501 em Engn, Kyoto 6068501, Japan
Citazione:
T. Hamamura et al., "Ease of control of imperfectly mixed continuous DTB crystallizers", KAG KOG RON, 27(3), 2001, pp. 359-366

Abstract

This study examines the effects of imperfect mixing on the ease of controlin continuous crystallization processes. A compartment model was employed to describe imperfect mixing in a crystallizer vessel, and size-dependent classification functions were introduced to describe the internal classification of crystals. The size-dependent classification functions were built byperforming intensive CFD (computational fluid dynamics) calculations. The nucleation rate equation used in the perfect mixing model was extended to allow the domination of nucleation by crystal-impeller collision to be considered. The index of ease of control was used to evaluate how easily a crystallizer can be controlled. This index indicates the strength of control action relative to that of the physical feedback effects which cause oscillation. In this work, the ideaof ease of control was extended so that the ease of control could be evaluated based on the compartment model. It was shown that the imperfect mixing and the internal classification strongly influence the operating conditions under which a crystallizer can be controlled easily. The internal classification also strongly affects the spatial distribution of supersaturation in the crystallizer vessel.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 05:46:25