期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 31, 期 -, 页码 3377-3384出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2006.08.083
关键词
oxy-fuel combustor; oxygen-enhanced combustion; FGR (flue gas recirculation); NO emission
In the present study, the NO emission characteristics have been experimentally investigated for the oxy-fuel combustors using flue gas recirculation (FGR) technology. In order to find the optimal inlet arrangement and operating conditions of the FGR oxy-fuel combustor, the flame stability tests have been carried out for various oxy-fuel combustor. The oxy-fuel combustor with two separate oxidizer nozzles yields the most stable flames in a wide range Of CO2 ratios. The NO emission characteristics are also experimentally analyzed for the various operating conditions of 0.03 and 0.2 MW FGR oxy-fuel combustors. Based on experimental results, the detailed discussions have been made for the effects Of CO2 ratio, FGR ratio, and oxygen flow-rate ratio on the NO emission. When the 0.03 MW oxy-fuel combustor is operated at the 40% FGR ratio, the NO emission level is below 30 ppm and the reduction ratio of NO emission is approximately 93%. In the 0.2 MW FGR oxy-fuel combustors operated at the 40% FGR ratio, the NO emission level is below 150 ppm and the reduction ratio of NO emission is approximately 85%. Experimental results clearly indicate that the present FGR technology is quite effective for reducing the NO emission in the oxy-fuel combustor. (c) 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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