Experimental Study on Combustion Behaviors and Carbon Monoxide Emission Characteristics of Single Coal Pellets
Publication: Journal of Energy Engineering
Volume 144, Issue 5
Abstract
Combustion behaviors and carbon monoxide emission characteristics of four kinds of coals and their blends, which were shaped into pellets, were investigated in a drop-tube furnace with various gas flow temperature (650–850°C) and oxygen concentration (10–70%). Pellets of 6 mm were hung by a wire basket and the combustion process was recorded at 60 frames/s using a high-performance camera. The ignition of the bituminous pellet was found to be homogeneous but it was heterogeneous for anthracite. When the oxygen concentration was more than 50%, an obvious fragment was found for the anthracite pellet, which caused higher surface temperature compared with the predicted temperature. The instantaneous CO emission of the bituminous coal had two peaks, whereas there was only one peak for that of anthracite. The total CO emission decreased exponentially when the temperature and oxygen concentration increased, and the oxygen concentration had more influence on the reduction of CO emission. CO generation was also affected by coal type; the higher the carbon and ash component of the coal, the more CO was generated with the same conditions.
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Acknowledgments
This work is supported by National Natural Science Foundation of China (No. 51376171).
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Published In
Journal of Energy Engineering
Volume 144 • Issue 5 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 16, 2018
Accepted: Apr 9, 2018
Published online: Jul 3, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 3, 2018
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