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Indicators of ignition for clouds of pulverized coal

โœ Scribed by T.F. Wall; D. Phong-Anant; V.S. Gururajan; L.J. Wibberley; A. Tate; J. Lucas

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
392 KB
Volume
72
Category
Article
ISSN
0010-2180

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โœฆ Synopsis

Experiments are reported giving visual observations of ignition--the emission of light or flashing--and the changes of gas composition--O:, CO:, and NO--in a laboratory drop-tube furnace fed continuously with pulverized coal and air in near-stoichiometric proportions. As the furnace is slowly heated at 10*C/min an early consumption of oxygen is measured (at gas temperatures of 200-350"C); the initial flashing is observed with no associated change in the extent of combustion (400-600"C), followed by rapid combustion and NO generation as the char ignites (650-800"C). Flashing is shown to be an extremely rare event with only a single flash observed for several thousand coal particles fed. Results are reported for the effect of coal type, particle size, and equivalence ratio.

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Letters to the Editors on points of scientific interest related to combustion and flames are invited. The Editors do not hold themselves responsible for opinions expressed in correspondence. Anonymous contributions cannot be accepted.