Numerical analysis of pulverized coal combustion characteristics using advanced low-NOx burner |
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Authors: | Ryoichi Kurose Hisao Makino |
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Affiliation: | a Yokosuka Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan b CS Promotion Office, Central Research Institute of Electric Power Industry (CRIEPI), Otemachi Bldg., 1-6-1 Otemachi, Chiyoda-ku, Tokyo 100-8126, Japan c CD-adapco JAPAN Co., LTD, Yokohama Landmark Tower 37F, 2-2-1-1 Minato Mirai, Nishi-ku, Yokohama, Kanagawa 220-8137, Japan |
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Abstract: | A three-dimensional numerical simulation is applied to a pulverized coal combustion field in a test furnace equipped with an advanced low-NOx burner called CI-α burner, and the detailed combustion characteristics are investigated. In addition, the validities of the existing NOx formation and reduction models are examined. The results show that a recirculation flow is formed in the high-gas-temperature region near the CI-α burner outlet, and this lengthens the residence time of coal particles in this high-temperature region, promotes the evolution of volatile matter and the progress of char reaction, and produces an extremely low-O2 region for effective NO reduction. It is also found that, by lessening the effect of NO reduction in Levy et al.'s model and taking the NO formation from char N into account, the accuracy of the NO prediction is improved. The efficiency factor of the conversion of char N to NO affects the total NO concentration downstream after the injection of staged combustion air. |
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Keywords: | Pulverized coal combustion Numerical simulation Advanced low-NOx burner |
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