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RESEARCH PAPERS: Forced Convection

Effect of Ferric Chloride on Silica Fouling

[+] Author and Article Information
S. H. Chan, Z. J. Chen, P. He

Department of Mechanical Engineering, University of Wisconsin—Milwaukee, Milwaukee, WI 53211

J. Heat Transfer 117(2), 323-328 (May 01, 1995) (6 pages) doi:10.1115/1.2822524 History: Received November 01, 1993; Revised April 01, 1994; Online December 05, 2007

Abstract

This study presents the results of an experimental investigation of the effects of Fe3+ ion in aqueous solution on silica fouling of heat exchanger and assesses the relative effect of Fe3+ , Na+ , and K+ ions on silica fouling. Experiments were conducted at 165–125°C, 1.58 MPa, and under turbulent flow conditions. It was shown that adding a few ppm of Fe3+ into silica solution was sufficient to formulate chemical coagulation and deposition of silica colloidal particles, which in turn caused a significant increase in the fouling rate. It was also observed that when Fe3+ was added to the silica solutions containing either Na+ or K+ ions, the fouling behaviors were found to be similar. Thus Fe3+ was found to be dominant over Na+ and K+ ions in its effects on silica fouling.

Copyright © 1995 by The American Society of Mechanical Engineers
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