Influence of OFA Nozzle Position on NOx Emission

WANG Ding-hui, WANG Xiao-tian, GUO Yong-hong, SUN Bao-min, BAI Tao

Journal of Chinese Society of Power Engineering ›› 2012, Vol. 32 ›› Issue (7) : 523-527.
Boiler Technology

Influence of OFA Nozzle Position on NOx Emission

  • WANG Ding-hui, WANG Xiao-tian, GUO Yong-hong, SUN Bao-min, BAI Tao
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Abstract

To reduce the NOx emission of a coal-fired boiler with swirl burners, a retrofit scheme was proposed by adopting the air-staged combustion mode, based on which a numerical simulation was carried out on the in-furnace combustion and pollutant formation respectively at 3 positions of OFA nozzle using CFD software platform at rated load, so as to determine the optimum position of OFA nozzle. Results show that the uplifting of OFA nozzle will reduce the O2 volumetric fraction in the main combustion zone and therefore reduce the highest temperature in the furnace by 23-29 K; the position of OFA nozzle plays a role in influencing the NOx reduction, outlet gas temperature and coal/coke conversion rate; with the lifting of OFA nozzle position, the NOx mass concentration reduces, the outlet gas temperture rises and the coal/coke conversion rate drops. Considering above effects comprehensively, the optimal position of OFA nozzle is finally determined as 7.7 m away from the burner of upper layer.

Key words

pulverized coal-fired boiler / OFA / nozzle position / NOx emission / numerical simulation

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WANG Ding-hui, WANG Xiao-tian, GUO Yong-hong, SUN Bao-min, BAI Tao. Influence of OFA Nozzle Position on NOx Emission. Journal of Chinese Society of Power Engineering. 2012, 32(7): 523-527

References

[1] 张楚莹,王书肖,邢佳,等.中国能源相关的氮氧化物排放现状与发展趋势分析[J].环境科学学报,2008,28(12):2471-2479.
ZHANG Chuying, WANG Shuxiao, XING Jia, et al. Current status and future projections of NOx emissions from energy related industries in China[J]. Journal of Environmental Sciences, 2008, 28(12): 2471-2479.
[2] 董海梅,张晓辉,孙锐,等.立体分级低NOx燃烧系统数值模拟[J].节能技术,2008,26(4):305-309.
DONG Haimei, ZHANG Xiaohui, SUN Rui, et al. Numerical simulation of stereo-staged combustion system[J]. Energy Conservation Technology, 2008, 26(4): 305-309.
[3] 白涛,郭永红,孙保民,等.1 025 t/h旋流燃烧器煤粉炉降低NOx生成的数值模拟[J].中国电机工程学报,2010,30(29):16-23.
BAI Tao, GUO Yonghong, SUN Baomin, et al. Numerical simulation of decreasing NOx emission in a swirling combustion pulverized coal boiler[J]. Proceedings of the CSEE, 2010, 30(29): 16-23.
[4] 高小涛,黄磊,张恩先,等.600 MW前后墙布置燃烧器锅炉的NOx排放特性及其影响因素的分析[J].动力工程,2009,29(9):806-813.
GAO Xiaotao, HUANG Lei, ZHANG Enxian, et al. NOx emission and influence factors of 600 MW boilers with burners arranged in front and back walls[J]. Journal of Power Engineering, 2009, 29(9): 806-813.
[5] 王福军.计算流体动力学分析[M].北京:清华大学出版社,2005:205-206.
[6] 陶文铨.计算传热学的近代进展[M].北京:科学出版社,2006:71-80.
[7] Fluent Inc. Fluent 6.3 user’s guide[M]. Lebanon, USA: Fluent Inc., 2006: 1333-1334.
[8] 潘维,池作和,斯东波,等.200 MW 四角切圆燃烧锅炉改造工况数值模拟[J].中国电机工程学报,2005,25(8):110-115.
PAN Wei, CHI Zuohe, SI Dongbo, et al. Numerical simulation of combustion process in a 200 MW tangentially fired furnace to study furnace reconstruction[J]. Proceedings of the CSEE, 2005, 25(8): 110-115.
[9] 岑可法,姚强,骆仲泱,等.燃烧理论与污染控制[M].北京:机械工业出版社,2004:410-460.
[10] FENIMORE C P. Reactions of fuel-nitrogen in rich flame gases[J]. Environmental Technology, 1976,26: 249-256.
[11] HILL S C, SMOOT L D. Modeling of nitrogen oxides formation and destruction in combustion systems[J]. Progress in Energy and Combustion Science, 2000, 26(4/5/6): 417-458.
[12] 环境保护部,国家质量监督检验检疫总局.GB 13223—2011火电厂大气污染物排放标准[S].北京:中国标准出版社,2011.
[13] 马立军.空气分级燃烧对炉内NOx生成影响的数值模拟研究[J].锅炉制造,2010(1):20-25.
MA Lijun. Numerical simulatiion study of staged combustion reducing NOx emission[J]. Boiler Manufacturing, 2010(1): 20-25.

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