Effect of Suspended Particles on Crystallization Fouling in Plate Heat Exchangers-Reference-Cited by-同舟云学术

Effect of Suspended Particles on Crystallization Fouling in Plate Heat Exchangers

Published:1997-08-01 Issue:3 Volume:119 Page:568-574
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Bansal B.¹,Mu¨ller-Steinhagen H.²,Chen X. D.¹

Affiliation:

1. Department of Chemical and Materials Engineering, The University of Auckland, New Zealand

2. Department of Chemical and Process Engineering, The University of Surrey, England

Abstract

The presence of suspended particles in solutions significantly affects the crystallization rate. This study investigates the effects of calcium sulphate (crystallizing) particles and alumina (noncrystallizing) particles on calcium sulphate crystallization fouling in a plate heat exchanger. Calcium sulphate particles are formed during the preparation of calcium sulphate solution due to breakage of calcium sulphate crystals growing on the heat transfer surface. These suspended particles settle on the heat transfer surface and act as nuclei. The availability of extra nucleation sites increases the crystallization rate significantly. These particles can be removed with a filter, and the removal of the particles prevents this extra assistance available for crystallization. Therefore, the crystallization rate is reduced markedly. Alumina particles were purposely added during the preparation of calcium sulphate solutions. These particles attach loosely to the heat transfer surface compared with crystalline deposits which adhere strongly. Therefore, calcium sulphate crystals growing on these particles are removed easily. Also, alumina particles settling on the growth faces of calcium sulphate crystals may act as a distorting agent. This slows down the growth of the crystals.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/119/3/568/5789852/568_1.pdf

Reference19 articles.

1. Amjad Z. , 1988, “Calcium Sulphate Dihydrate (Gypsum) Scale Formation on Heat Exchangers Surfaces: The Influence of Scale Inhibitors,” Journal of Colloid and Interface Science, Vol. 123, No. 2, pp. 523–536.

2. Bansal, B., 1994, “Crystallisation Fouling in Plate Heat Exchangers,” Ph.D. thesis, Department of Chemical and Materials Engineering, The University of Auckland, New Zealand.

3. Bansal B. , and Mu¨ller-SteinhagenH., 1993, “Crystallisation Fouling in Plate Heat Exchangers,” ASME JOURNAL OF HEAT TRANSFER, Vol. 115, pp. 584–591.

4. Bansal, B., and Mu¨ller-Steinhagen, H., 1996, “Pressure Drop in Plate Heat Exchangers during Crystallisation Fouling,” Proceedings of the Conference of the Institution of Professional Engineers, Vol. 2, Part 2, Dunedin, New Zealand, pp. 302–307.

5. Bott, T. R., 1981, The Fouling of Heat Exchangers, Department of Scientific and Industrial Research (DSIR), Wellington, New Zealand.

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