一次氧化剂O2体积分数对富氧燃烧煤粉着火距离影响的数值模拟

许杨杨, 周月桂, 金旭东, 顾广锦

动力工程学报 ›› 2013, Vol. 33 ›› Issue (9) : 665-670.
锅炉技术

一次氧化剂O2体积分数对富氧燃烧煤粉着火距离影响的数值模拟

  • 许杨杨, 周月桂, 金旭东, 顾广锦
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Effect of O2 Volumetric Fraction in Primary Oxidant on Ignition Standoff Distance of Oxy-coal Combustion

  • XU Yangyang, ZHOU Yuegui, JIN Xudong, GU Guangjin
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摘要

对40 kW同轴射流富氧煤粉燃烧试验系统进行数值模拟,研究了在总体O2体积分数和氧化剂过量系数一定的条件下,不同一次氧化剂O2体积分数对同轴射流富氧燃烧煤粉着火距离的影响,分析了低一次氧化剂O2体积分数下富氧燃烧煤粉着火及火焰稳定性.结果表明:在总体O2体积分数为40%和氧化剂过量系数为1.15的条件下,当一次氧化剂O2体积分数为20.9%时,着火距离较小,为附着火焰;当一次氧化剂O2体积分数减小至14.6%、10.0%和5.5%时,着火距离明显增大,着火延迟,为分离火焰;适当提高二次氧化剂预热温度有利于低一次氧化剂O2体积分数下富氧燃烧的煤粉着火及火焰稳定.

Abstract

Numerical simulation was carried out to a 40 kW coaxial jet oxy-coal combustion facility, so as to analyze the effect of O2 volumetric fraction in primary oxidant on the ignition standoff distance under given overall O2 volumetric fraction and excess oxidant ratio, and to study the ignition mechanism and flame stability of the oxy-coal combustion under low O2 volumetric fractions in primary oxidant. Results show that the ignition standoff distance of oxy-coal combustion is found to be small with an attached flame for an O2 volumetric fraction of 20.9% in primary oxidant, an overall O2 volumetric fraction of 40% and an excess oxidant ratio of 1.15. However, the ignition is delayed with an increased standoff distance and a detached flame when the O2 volumetric fraction in primary oxidant drops to 14.6%, 10.0% and 5.5%, respectively. Higher preheat temperature of secondary oxidant is helpful to the formation of stable flames under low O2 volumetric fraction in primary oxidant for oxy-coal combustion system.

关键词

富氧煤粉燃烧 / 同轴射流燃烧器 / 一次氧化剂 / O2体积分数 / 着火距离

Key words

oxy-coal combustion / coaxial jet burner / primary oxidant / O2 volumetric fraction / ignition standoff distance

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导出引用
许杨杨, 周月桂, 金旭东, 顾广锦. 一次氧化剂O2体积分数对富氧燃烧煤粉着火距离影响的数值模拟. 动力工程学报. 2013, 33(9): 665-670
XU Yangyang, ZHOU Yuegui, JIN Xudong, GU Guangjin. Effect of O2 Volumetric Fraction in Primary Oxidant on Ignition Standoff Distance of Oxy-coal Combustion. Journal of Chinese Society of Power Engineering. 2013, 33(9): 665-670

参考文献

[1] MOLINA A, SHADDIX C R. Ignition and devolatilization of pulverized bituminous coal particles during oxygen/carbon dioxide coal combustion[J]. Proceedings of the Combustion Institute,2007,31(2):1905-1912.
[2] CHEN L, YONG S Z, GHONIEM A F. Oxy-fuel combustion of pulverized coal: characterization, fundamentals, stabilization and CFD modeling[J]. Progress in Energy and Combustion Science, 2012, 38(2): 156-214.
[3] 樊越胜, 邹峥, 高巨宝, 等. 富氧气氛中煤粉燃烧特性改善的实验研究[J]. 西安交通大学学报, 2006, 40(1):18-21.
FAN Yuesheng, ZOU Zheng, GAO Jubao, et al. Experimental research of rich oxygen content on improving combustion characteristics of pulverized coal[J]. Journal of Xi'an Jiaotong University, 2006, 40(1):18-21.
[4] 周月桂, 初伟, 顾广锦, 等. 不同试验规模的富氧煤粉燃烧研究进展[J]. 锅炉技术, 2012, 48(5):70-73.
ZHOU Yuegui, CHU Wei, GU Guangjin, et al. Oxy-coal combustion progresses with different scale tests[J]. Boiler Technology, 2012, 48(5):70-73.
[5] HEIL P, TOPOROV D, STADLER H, et al. Development of an oxycoal swirl burner operating at low O2 concentrations[J]. Fuel, 2009, 88(7):1269-1274.
[6] ZHANG J, KELLY K E, EDDINGS E G, et al. Ignition in 40 kW co-axial turbulent diffusion oxy-coal jet flames[J]. Proceedings of the Combustion Institute, 2011, 33(2): 3375-3382.
[7] JONES J M. Modelling NOx formation in coal particle combustion at high temperature: an investigation of the devolatilisation kinetic factors[J]. Fuel, 1999, 78(10): 1171-1179.
[8] GERA D, MATHUR M, FREEMAN M. Parametric sensitivity study of a CFD-based coal devolatilization model[J]. Energy & Fuels, 2003, 17(3): 794-795.
[9] WU Y X, SMITH P J, ZHANG J S, et al. Effects of turbulent mixing and controlling mechanisms in an entrained flow coal gasifier[J]. Energy & Fuels, 2010, 24(2): 1170-1175.
[10] KHARE S P, WALL T F, FARIDA A Z, et al. Factors influencing the ignition of flames from air-fired swirl pf burners retrofitted to oxy-fuel[J]. Fuel, 2008, 87(7): 1042-1049.
[11] FAU'NDEZ J, ARENILLAS A, RUBIERA F, et al. Ignition behaviour of different rank coals in an entrained flow reactor[J]. Fuel, 2005, 84(17): 2172-2177.
[12] 樊越胜, 司鹏飞, 曹子栋. 富氧煤粉气流着火机理的实验研究[J]. 动力工程学报, 2011, 31(1):33-36.
FAN Yuesheng, SI Pengfei, CAO Zidong. Experimental study on ignition mechanisms of pulverized coal in oxygen-enriched atmosphere[J]. Journal of Chinese Society of Power Engineering, 2011, 31(1):33-36.
[13] 崔凯, 张海, 吴玉新, 等. 富氧煤粉燃烧器的数值模拟与实验验证[C]//中国工程热物理学会燃烧学学术年会论文集. 杭州:中国工程热物理学会, 2011.
[14] JOVANOVIC R, MILEWSKA A, SWIATKOWSKI B, et al. Sensitivity analysis of different devolatilisation models on predicting ignition point position during pulverized coal combustion in O2/N2 and O2/CO2 atmospheres[J]. Fuel, 2012, 101(1):23-37.

基金

教育部新世纪优秀人才支持计划资助项目(NCET-10-0584);上海市科学技术委员会科研计划资助项目(11DZ1203600);教育部留学回国人员科研启动基金第45批;上海交通大学晨星青年学者奖励计划B类计划(12X100010102)

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