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Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NO<inf>x</inf>formation

Muto, M and Watanabe, H and Kurose, R and Komori, S and Balusamy, S and Hochgreb, S (2015) Large-eddy simulation of pulverized coal jet flame - Effect of oxygen concentration on NO<inf>x</inf>formation. Fuel, 142. pp. 152-163. ISSN 0016-2361

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© 2014 Elsevier Ltd. All rights reserved. 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 O2concentration increases from 21% to 40%, O2consumption becomes marked because gas temperature rises and oxidation reaction is enhanced by the higher concentration of O2. 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 O2. The trend becomes significant as the O2concentration 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.

Item Type: Article
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 20 Jul 2018 20:22