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Post-ignition transients in the combustion of single char particles

Levendis, Yiannis A. and Sahu, Ranajit and Flagan, Richard C. and Gavalas, George R. (1989) Post-ignition transients in the combustion of single char particles. Fuel, 68 (7). pp. 849-855. ISSN 0016-2361 . https://resolver.caltech.edu/CaltechAUTHORS:20151019-094243231

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Abstract

he temperature-time histories of single char particles burning at temperatures above 1500 K have been measured by two-colour near infrared pyrometry techniques. Two coal chars and a synthetic char consisting of spherical glassy carbon particles of uniform size were used in the experiments. The results indicate that with lean combustion and low-to-medium temperatures, the char particles do not ignite over their whole external surface, but exhibit preferential ignition at specific sites. These ‘hot-spots’ probably involve regions in which the material exhibits strong inhomogeneities, either on or below the surface. Following ignition, the reaction may propagate over the particle surface. At elevated combustor temperatures and/or high oxygen partial pressures, ignition spreads quickly over the entire particle surface and the importance of the hot-spots diminishes. A simple model is used to estimate the rate of growth of a hot-spot under various experimental conditions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0016-2361(89)90119-1DOIArticle
http://www.sciencedirect.com/science/article/pii/0016236189901191PublisherArticle
ORCID:
AuthorORCID
Flagan, Richard C.0000-0001-5690-770X
Gavalas, George R.0000-0003-1468-6835
Additional Information:© 1989 Elsevier. (Received 17 May 1988; revised 29 November 1988). This work was supported by the U.S. Department of Energy University Coal Programs Grant Number DE-FG22-84PC70775.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG22-84PC70775
Subject Keywords:char; combustion; ignition
Issue or Number:7
Record Number:CaltechAUTHORS:20151019-094243231
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151019-094243231
Official Citation:Yiannis A. Levendis, Ranajit Sahu, Richard C. Flagan, George R. Gavalas, Post-ignition transients in the combustion of single char particles, Fuel, Volume 68, Issue 7, July 1989, Pages 849-855, ISSN 0016-2361, http://dx.doi.org/10.1016/0016-2361(89)90119-1. (http://www.sciencedirect.com/science/article/pii/0016236189901191)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61246
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Oct 2015 18:00
Last Modified:03 Oct 2019 09:05

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