山西无烟煤空气分级燃烧NO_x排放特性试验研究
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摘要
采用自建的20 kW煤粉燃烧自维持一维试验炉系统进行了山西无烟煤空气分级燃烧和NO_x排放特性试验。结果表明:该系统能够实现煤粉气流在炉内自维持稳定燃烧,可有效地模拟煤粉锅炉炉内的流动、燃烧以及NO_x生成的全过程;单级空气分级燃烧时,增加空气分级深度有利于提高NO_x还原效率,NO_x还原效率最高可达51.7%;随着空气分级深度的增加,最佳燃尽风喷口位置向上偏移;通过合理配置燃尽风喷口位置及燃尽风量比例,多级空气分级燃烧时的NO_x还原效率将高于单级空气分级燃烧,可达60%。
NO_x emission characteristics of Shanxi anthracite were tested in a 20 kW one-dimensional self-sustaining furnace system under different air-staged combustion conditions. Results show that the self-built test system helps to realize the self-sustaining combustion of pulverized coal and is able to effectively simulate the whole process from pulverized coal flow to coal combustion and NO_x formation in the furnace. Under single-staged combustion conditions, the NO_x reduction efficiency increases with the deepening of air staging, and the maximum reduction efficiency may get up to 51.7%. With the deepening of air staging, the best postion of burnout air nozzles move upward. The NO_x reduction efficiency in multi-air-staged combustion condition is greatly higher than the single-air-staged condition by appropriately arranging the burnout air nozzles and reasonably selecting the burnout air ratio, which may reach 60%.
NO_x emission characteristics of Shanxi anthracite were tested in a 20 kW one-dimensional self-sustaining furnace system under different air-staged combustion conditions. Results show that the self-built test system helps to realize the self-sustaining combustion of pulverized coal and is able to effectively simulate the whole process from pulverized coal flow to coal combustion and NO_x formation in the furnace. Under single-staged combustion conditions, the NO_x reduction efficiency increases with the deepening of air staging, and the maximum reduction efficiency may get up to 51.7%. With the deepening of air staging, the best postion of burnout air nozzles move upward. The NO_x reduction efficiency in multi-air-staged combustion condition is greatly higher than the single-air-staged condition by appropriately arranging the burnout air nozzles and reasonably selecting the burnout air ratio, which may reach 60%.
引文
[1] TANIGUCHI M, KAMIKAWA Y, YAMAMOTO K. Comparison of staged combustion properties between bituminous coals and a low-rank coal; fiber-shaped crystallized carbon formation, NOx emission and coal burnout properties at very high temperature[J]. Combustion and Flame, 2013, 160(10): 2221-2230.
[2] YANG Jiancheng, SUN Rui, SUN Shaozeng, et al. Experimental study on NOx reduction from staging combustion of high volatile pulverized coals. Part 2. Fuel staging[J]. Fuel Processing Technology, 2015, 138: 445-454.
[3] SUNG Y, MOON C, EOM S, et al. Coal-particle size effects on NO reduction and burnout characteristics with air-staged combustion in a pulverized coal-fired furnace[J]. Fuel, 2016, 182: 558-567.
[4] LI Yu, FAN Weidong. Effect of char gasification on NOx formation process in the deep air-staged combustion in a 20 kW down flame furnace[J]. Applied Energy, 2016, 164: 258-267.
[5] 肖理生, 曾汉才, 金峰, 等. 分级燃烧最佳一次风空气系数的实验研究[J]. 动力工程学报, 2001, 21(1): 1042-1045. XIAO Lisheng, ZENG Hancai, JIN Feng, et al. Effects of air staging and particle size on NOx emissions and unburnt carbon in fly ash[J]. Power Engineering, 2001, 21(1): 1042-1045.
[6] FAN Weidong, LIN Zhengchun, LI Youyi, et al. Effect of air-staging on anthracite combustion and NOx formation[J]. Energy & Fuels, 2009, 23(1): 111-120.
[7] TANIGUCHI M, KAMIKAWA Y, TATSUMI T, et al. Staged combustion properties for pulverized coals at high temperature[J]. Combustion and Flame, 2011, 158(11): 2261-2271.
[8] 蒋信, 范卫东, 赵达, 等. 大同烟煤空气分级燃烧NOx生成特性的试验研究[J]. 锅炉技术, 2016, 47(1): 54-58. JIANG Xin, FAN Weidong, ZHAO Da, et al. Experimental research on NOx emission of Datong bituminous coal in air-staged combustion[J]. Boiler Technology, 2016, 47(1): 54-58.
[9] KUROSE R, IKEDA M, MAKINO H, et al. Pulverized coal combustion characteristics of high-fuel-ratio coals[J]. Fuel, 2004, 83(13): 1777-1785.
[10] 孙保民, 王顶辉, 段二朋, 等. 空气分级燃烧下NOx生成特性的研究[J]. 动力工程学报, 2013, 33(4): 261-266. SUN Baomin, WAN Dinghui, DUAN Erpeng, et al. Investigation on NOx formation characteristics under air-staged combustion[J]. Journal of Chinese Society of Power Engineering, 2013, 33(4): 261-266.
[11] ZABETTA E C, HUPA M, SAVIHARJU K. Reducing NOx emissions using fuel staging, air staging, and selective noncatalytic reduction in synergy[J]. Industrial & Engineering Chemistry Research, 2005, 44(13): 4552-4561.
[12] 杨建成, 吴江全, 胡亚民, 等. 高燃料氮烟煤空气分级燃烧氮氧化物排放特性实验研究[J]. 热能动力工程, 2015, 30(1): 101-107. YANG Jiancheng, WU Jiangquan, HU Yamin, et al. Experimental study of the nitrogen oxide emissions characteristics of a bituminous coal with a high fuel nitrogen content under the condition of the air staged combustion[J]. Journal of Engineering for Thermal Energy and Power, 2015, 30(1): 101-107.
[2] YANG Jiancheng, SUN Rui, SUN Shaozeng, et al. Experimental study on NOx reduction from staging combustion of high volatile pulverized coals. Part 2. Fuel staging[J]. Fuel Processing Technology, 2015, 138: 445-454.
[3] SUNG Y, MOON C, EOM S, et al. Coal-particle size effects on NO reduction and burnout characteristics with air-staged combustion in a pulverized coal-fired furnace[J]. Fuel, 2016, 182: 558-567.
[4] LI Yu, FAN Weidong. Effect of char gasification on NOx formation process in the deep air-staged combustion in a 20 kW down flame furnace[J]. Applied Energy, 2016, 164: 258-267.
[5] 肖理生, 曾汉才, 金峰, 等. 分级燃烧最佳一次风空气系数的实验研究[J]. 动力工程学报, 2001, 21(1): 1042-1045. XIAO Lisheng, ZENG Hancai, JIN Feng, et al. Effects of air staging and particle size on NOx emissions and unburnt carbon in fly ash[J]. Power Engineering, 2001, 21(1): 1042-1045.
[6] FAN Weidong, LIN Zhengchun, LI Youyi, et al. Effect of air-staging on anthracite combustion and NOx formation[J]. Energy & Fuels, 2009, 23(1): 111-120.
[7] TANIGUCHI M, KAMIKAWA Y, TATSUMI T, et al. Staged combustion properties for pulverized coals at high temperature[J]. Combustion and Flame, 2011, 158(11): 2261-2271.
[8] 蒋信, 范卫东, 赵达, 等. 大同烟煤空气分级燃烧NOx生成特性的试验研究[J]. 锅炉技术, 2016, 47(1): 54-58. JIANG Xin, FAN Weidong, ZHAO Da, et al. Experimental research on NOx emission of Datong bituminous coal in air-staged combustion[J]. Boiler Technology, 2016, 47(1): 54-58.
[9] KUROSE R, IKEDA M, MAKINO H, et al. Pulverized coal combustion characteristics of high-fuel-ratio coals[J]. Fuel, 2004, 83(13): 1777-1785.
[10] 孙保民, 王顶辉, 段二朋, 等. 空气分级燃烧下NOx生成特性的研究[J]. 动力工程学报, 2013, 33(4): 261-266. SUN Baomin, WAN Dinghui, DUAN Erpeng, et al. Investigation on NOx formation characteristics under air-staged combustion[J]. Journal of Chinese Society of Power Engineering, 2013, 33(4): 261-266.
[11] ZABETTA E C, HUPA M, SAVIHARJU K. Reducing NOx emissions using fuel staging, air staging, and selective noncatalytic reduction in synergy[J]. Industrial & Engineering Chemistry Research, 2005, 44(13): 4552-4561.
[12] 杨建成, 吴江全, 胡亚民, 等. 高燃料氮烟煤空气分级燃烧氮氧化物排放特性实验研究[J]. 热能动力工程, 2015, 30(1): 101-107. YANG Jiancheng, WU Jiangquan, HU Yamin, et al. Experimental study of the nitrogen oxide emissions characteristics of a bituminous coal with a high fuel nitrogen content under the condition of the air staged combustion[J]. Journal of Engineering for Thermal Energy and Power, 2015, 30(1): 101-107.