2015年2月
Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NOx formation
FUEL
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- 巻
- 142
- 号
- 15
- 開始ページ
- 152
- 終了ページ
- 163
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.fuel.2014.10.069
- 出版者・発行元
- ELSEVIER SCI LTD
Large-eddy simulation is applied to a laboratory-scale open-type pulverized coal flame generated by a triple stream burner, and the NO production and reduction in oxy-fuel condition are investigated for the first time. Pulverized Cerrejon coal which is classified as bituminous coal is used as a fuel. The results show that regardless of the equivalence ratio, as the O-2 concentration increases from 21% to 40%, O-2 consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O-2. Also, NO is formed rapidly due to the oxidation reaction of nitrogen from volatile matter of coal, and its concentration reaches a few hundred ppm further downstream. After the rapid formation, in the case of equivalence ratio larger than unity, NO decreases, because the reducing atmosphere becomes dominant due to the lack of O-2. The trend becomes significant as the O-2 concentration in the carrier gas increases from 21% to 40%. In the case of equivalence ratio less than unity, on the other hand, NO does not decrease clearly, because the oxidizing atmosphere contributes to the further formation of NO. Present study shows the usefulness of the large-eddy simulations for predicting the characteristics of pulverized coal flames. (C) 2014 Elsevier Ltd. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.fuel.2014.10.069
- ISSN : 0016-2361
- eISSN : 1873-7153
- Web of Science ID : WOS:000345699100020