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• W3144126749 endingPage "120758" @default.
• W3144126749 startingPage "120758" @default.
• W3144126749 abstract "The experiments of the effect of particle size on flameless combustion characteristics and NOx emissions of Shenmu semi-coke were launched on a bench-scale coal preheating combustion test rig. The results revealed that the difference of fuel particle size greatly influenced the yield of each component in high-temperature coal gas and the reactive activity of coal char, thus subsequently affecting the final combustion process and NOx emissions. The specific surface area and pore volume of Shenmu semi-coke were both significantly increased after preheated, leading to a better reactivity and the improved combustion performance, especially when d50 (the mean particle size) = 163.84 μm, where the temperature of the down-fired combustor reached the highest. The different particle size of Shenmu semi-coke resulted in different preheating temperature, which further affected the content of each component in the high-temperature coal gas. During the self-preheating process, most volatile matter and fuel bound N were separated out and the released N was mainly converted to N2 and NH3, besides the conversion rate of each component (C, H, N and V) was the highest when d50 = 100.17 µm. Additionally, all experimental conditions achieved flameless combustion, with a transparent combustion area, but no flame front visible to the naked eye, and the highest combustion efficiency was 98.23% when d50 = 163.84 µm with the brightest flame image. It was discovered in this experimental that there was a critical value (d50 = 198.54 μm) of Shenmu semi-coke particles. When the particle size was lower than or higher than the critical value, NOx generated by combustion would decrease. The lowest NOx emission was 89.46 mg/m3 (@6% O2) when d50 was 35.34 μm." @default.
• W3144126749 created "2021-04-13" @default.
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• W3144126749 date "2021-08-01" @default.
• W3144126749 modified "2023-10-10" @default.
• W3144126749 title "The effects of particle size on flameless combustion characteristics and NO emissions of semi-coke with coal preheating technology" @default.
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• W3144126749 doi "https://doi.org/10.1016/j.fuel.2021.120758" @default.
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