Effect of the Adjustable Inner Secondary Air-Flaring Angle of Swirl Burner on Coal-Opposed Combustion
Publication: Journal of Energy Engineering
Volume 142, Issue 1
Abstract
A novel swirl burner with an adjustable inner secondary air (ISA)-flaring angle is proposed. The authors conducted a combustion experiment in a 0.6 MW wall-fired pilot-scale furnace with the novel swirl burner and numerically simulated the combustion characteristic correspondingly. The effects of the inner secondary air-flaring angle of the burner on coal combustion, including gas temperature, wall temperature distributions, unburned carbon in the fly ash, and emissions, are reported in detail. Both experimental and numerical results indicate that increasing can improve coal particle ignition and move the flame center close to the burner. To avoid hot corrosion, larger is recommended, because it helps to lower the temperature level of the furnace wall. The ISA-flaring angle of burner can be optimized to improve burnout and limit emissions. The condition of the highest burnout corresponds to that of the highest emissions with the same ISA-flaring angle of the burner. Combustion efficiency and emissions can be balanced through the variation of . With this new ISA-flaring angle adjustable burner, coal combustion will become more controllable and cleaner, while being more reliable.
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Acknowledgments
The authors are grateful to the National Key Technology R&D Program of China (Contract No. 2014BAA02B02) and the Program for New Century Excellent Talents in University of Chinese Education Ministry (NCET-13-0468). XC acknowledges support from NSFC (11172231 and 11372241), ARPA-E (DE-AR0000396), and AFOSR (FA9550-12-1-0159).
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Published In
Journal of Energy Engineering
Volume 142 • Issue 1 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 18, 2014
Accepted: Mar 17, 2015
Published online: Jun 1, 2015
Discussion open until: Nov 1, 2015
Published in print: Mar 1, 2016
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