NOx and SOx emissions of a high sulfur self-retention coal during air-staged combustion |
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Authors: | Sen Li Tongmo Xu Peng Sun Qulan Zhou Houzhang Tan Shien Hui |
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Affiliation: | State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, 28 Xian Ning Road, Xi’an 710049, People’s Republic of China |
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Abstract: | NOx and SOx emissions of air-staged combustion were investigated in a 1 MW tangentially-fired furnace combusting a high sulfur self-retention coal. Two variables including the air stoichiometric ratio of primary combustion zone and the relative location of over-fire air (OFA) injection ports were studied. These results suggest that NOx reduction efficiency monotonically increases with increasing the relative location of OFA injection ports, and the lowest NOx emissions are achieved when the air stoichiometric ratio of primary combustion zone is 0.85. In the meantime, SOx emissions can be effectively reduced when the air stoichiometric ratio of primary combustion zone is 0.85 or 0.95, and SOx emissions monotonically decrease with increasing the relative location of OFA injection ports. |
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Keywords: | Air-staged combustion NOx reduction SOx emissions Sulfur self-retention of coal |
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