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RESEARCH PAPERS: Combustion

A Heat and Mass Transfer Analysis of the Ignition and Extinction of Solid Char Particles

[+] Author and Article Information
T. X. Phuoc

U.S. Department of Energy, Federal Energy Technology Center, P.O. Box 10904, Pittsburgh, PA 15236

K. Annamalai

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

J. Heat Transfer 121(4), 886-893 (Nov 01, 1999) (8 pages) doi:10.1115/1.2826079 History: Received January 01, 1999; Revised July 12, 1999; Online December 05, 2007

Abstract

The present work studies the ignition and extinction of a spherical solid fuel particle exposed to a quiescent, hot, oxygen-containing environment. Using particle sizes and ambient temperature and oxygen concentration as parameters, the ignition, burning, and extinction of particles were parametrically analyzed by studying the relative heat production and heat-loss rates. For a given ambient condition, the results showed that it is possible that both large and small particles might not ignite at all. When a particle burns, its size decreases with time and its combustion characteristics are altered. The extinction condition may be reached due solely to the diminishing size of the particle. The particle extinction diameter was calculated. It strongly depends on the ambient condition and the reaction rate, but not on the initial particle size.

Copyright © 1999 by The American Society of Mechanical Engineers
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