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RESEARCH PAPERS

Nonradiative Heat Transfer Coefficients and “Cold” Operating Experience With a Laboratory SCFBC Model

[+] Author and Article Information
E. I. Umez-Eronini

Federal University of Technology, Owerri, Nigeria

J. N. Cannon

Chemical Engineering Department, Howard University, Washington, D.C. 20059

J. Energy Resour. Technol 108(2), 179-182 (Jun 01, 1986) (4 pages) doi:10.1115/1.3231259 History: Received July 16, 1984; Revised February 18, 1986; Online October 22, 2009

Abstract

A cold test model study of the staged cascade fluidized bed coal combustion process is described. Proper cascade flow of solids through the system was found to be sensitive to bed and downcomer distributor plate pressure drops. Control of bed depth by weir level was also complicated at high fluidization velocities by the process of entrained particles falling back into the downcomer. Bed to tube heat transfer coefficients ranging from 142 to 256W/m2 •K were measured at the top surface of a simulated boiler tube in shallow beds, 0.15 to 0.23m deep.

Copyright © 1986 by ASME
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