某600MW锅炉高温腐蚀和烟温偏差控制的数值模拟研究
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摘要
某600 MW四角切圆锅炉低氮燃烧改造后一直存在炉内高温腐蚀和两侧再热汽温偏差大的问题,对炉内贴壁气氛进行试验测试并进行数值模拟计算。结果表明:炉内局部还原性气氛尤为浓烈,特别是4号角区域,局部CO体积分数达到了12%; SOFA风量降低至总风量的20%后,炉内CO和H_2S体积分数明显减小,出口NO_x体积分数上升幅度在20%以内; 4号角二次风量低亦是再热汽温偏差较大的主要原因。在锅炉实际运行中降低燃尽风率、加大4号角二次风量,两侧汽温偏差均小于3℃,贴壁区域局部过强还原性气氛亦得到改善。
After low NOxburner modification,the problems of severe high temperature corrosion and reheat steam temperature deviation appear in a 600 MW tangentially coal-fired boiler. The corresponding investigation is carried out by experimentally probing the near wall atmosphere and numerical simulation.The results indicate that the reducing atmosphere of local furnace is particularly strong. The local concentration of CO is 12% near the horn 4. The concentration of CO and H_2S in furnace decreases significantly and the concentration of NO_xat outlet of furnace rises less than 20% after air flow of SOFA decreases to20% of total air rate. The primary cause of temperature deviation of reheating steam is the low secondary air flow of the horn 4. In actual running of boiler,the temperature deviation of reheating steam is less than3 ℃ and strong reducing atmosphere of local near water wall is improved after the rate of over-fired air is decreased and the secondary air flow is increased for the horn 4.
After low NOxburner modification,the problems of severe high temperature corrosion and reheat steam temperature deviation appear in a 600 MW tangentially coal-fired boiler. The corresponding investigation is carried out by experimentally probing the near wall atmosphere and numerical simulation.The results indicate that the reducing atmosphere of local furnace is particularly strong. The local concentration of CO is 12% near the horn 4. The concentration of CO and H_2S in furnace decreases significantly and the concentration of NO_xat outlet of furnace rises less than 20% after air flow of SOFA decreases to20% of total air rate. The primary cause of temperature deviation of reheating steam is the low secondary air flow of the horn 4. In actual running of boiler,the temperature deviation of reheating steam is less than3 ℃ and strong reducing atmosphere of local near water wall is improved after the rate of over-fired air is decreased and the secondary air flow is increased for the horn 4.
引文
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[14]田登峰,方庆艳,谭鹏,等.燃烧器上摆角度对四角切圆锅炉再热蒸汽温度偏差影响的数值模拟[J].化工学报,2015,66(7):2702-2708.TIAN Deng-feng,FANG Qing-yan,TAN Peng,et al. Numerical simulation on effect of burner tilting up angle on reheat steam temperature deviation for tangentially fired pulverized-coal boiler[J]. CIESC Journal,2015,66(7):2702-2708.
[15]赵振宁,王晶晶,徐立伟,等. 300 MW机组再热汽温低的原因分析及改造[J].中国电力,2012,45(12):21-25.ZHAO Zhen-ning,WANG Jing-jing,XU Li-wei,et al. Cause analysis for low reheat steam temperature and transformations of 300MW boilers[J]. Electric Power,2012,45(12):21-25.
[2]吕洪坤,华国钧,童家麟,等. 1 000 MW机组旋流燃烧器风量分布特性的数值模拟[J].热能动力工程,2017,32(1):86-90.LV Hong-kun,HUA Guo-jun,TONG Jia-lin,et,al. Numerical simulation on air flow distribution characteristics for 1 000 MW swirl burners[J]. Journal of Engineering for Thermal Energy and Power,2017,32(1):86-90.
[3]欧宗现,王超,张永和,等.低氮燃烧锅炉水冷壁高温腐蚀原因分析及对策[J].锅炉技术,2018,49(1):65-68.OU Zong-xian,WANG Chao,ZHANG Yong-he,et,al. Cause analysis of high temperature corrosion on water wall in boiler with low NOxcombustion and countermeasures thereof[J]. Boiler Technology,2018,49(1):65-68.
[4]贺桂林,张晓宇. 600 MW锅炉低氮燃烧器改造炉膛高温腐蚀分析[J].中国电力,2017,50(10):110-115.HE Gui-lin,ZHANG Xiao-yu. Analysis on high temperature corrosion of a 600 MW boiler furnace after low NOxcombustor retrofitting[J]. Electric Power,2017,50(10):110-115.
[5]邹磊,岳峻峰,管诗骈,等.超临界四角切圆锅炉运行方式对水冷壁高温腐蚀影响的试验研究[J].动力工程学报,2017,37(11):861-869.ZOU Lei,YUE Jun-feng,GUAN Shi-pian,et al. Effects of operation mode on temperature corrosion of the water wall in a supercritical tangential firing boiler[J]. Journal of Chinese Society of Power Engineering,2017,37(11):861-869.
[6]李春曦,许涛,李敏,等.对冲燃烧锅炉防高温硫腐蚀改造的数值研究[J].动力工程学报,2016,36(11):853-861.LI Chun-xi,XU Tao,LI Min,et al. Retrofit of an opposed firing boiler to prevent high-temperature sulfur corrosion[J]. Journal of Chinese Society of Power Engineering,2016,36(11):853-861.
[7]吕洪坤,童家麟,常毅君,等.超超临界锅炉低NOx优化对高温腐蚀的影响[J].热能动力工程,2017,32(9):109-114.LV Hong-kun,TONG Jia-lin,CHANG Yi-jun,et,al. Influence of low NOxcombustion optimization on the high-temperature corrosion for an ultra-supercritical boiler[J]. Journal of Engineering for Thermal Energy and Power,2017,32(9):109-114.
[8]姚露,陈天杰,刘建民,等.组合式贴壁风对660 MW锅炉燃烧过程的影响[J].东南大学学报(自然科学版),2015,45(1):85-90.YAO Lu,CHEN Tian-jie,LIU Jian-min,et al. Influence of closingto-wall air on combustion process in 660 MW opposed firing boiler[J]. Journal of South-east University(Natural Science Edition),2015,45(1):85-90.
[9]周永刚,李培,敖翔,等.基于燃烧均匀性的对冲燃烧锅炉高温腐蚀抑制[J].浙江大学学报(工学版),2015,49(9):1768-1775.ZHOU Yong-gang,LI Pei,AO Xiang,et,al. High temperature corrosion inhibition for opposed firing boiler based on combustion distribution evenness[J]. Journal of Zhejiang University(Engineering Science),2015,49(9):1768-1775.
[10]陈敏生,廖晓春. 600 MW超临界锅炉防止高温腐蚀技术改造和运行调整[J].中国电力,2014,47(4):56-59.CHEN Min-sheng,LIAO Xiao-chun. The retrofit of high-temperature corrosion prevention and operation adjustment for 600 MW supercritical boiler[J]. Electric Power,2014,47(4):56-59.
[11]秦明,姜文婷,吴少华.空气分级燃烧炉内壁面硫化物分布的数值模拟[J].动力工程学报,2016,32(2):91-98.QIN Ming,JIANG Wen-ting,WU Shao-hua. Numerical simulation of sulfide distribution on furnace walls with air-staged combustion[J]. Journal of Chinese Society of Power Engineering,2016,32(2):91-98.
[12]潘维,池作和,李戈,等.四角切圆燃烧锅炉燃烧和污染物排放数值模拟[J].浙江大学学报(工学版),2004,38(6):761-764.PAN Wei,CHI Zuo-he,LI Ge,et al. Numerical simulation of combustion and nitrogen oxides generation process in tangentially fired furnace[J]. Journal of Zhejiang University(Engineering Science),2004,38(6):761-764.
[13]方庆艳,汪华剑,陈刚,等.超超临界锅炉磨煤机组合运行方式优化数值模拟[J].中国电机工程学报,2011,31(5):1-6.FANG Qing-yan,WANG Hua-jian,CHEN Gang,et al. Optimal simulation on the combination mode of mills for an ultra-supercritical utility boiler[J]. Proceedings of the CSEE,2011,31(5):1-6.
[14]田登峰,方庆艳,谭鹏,等.燃烧器上摆角度对四角切圆锅炉再热蒸汽温度偏差影响的数值模拟[J].化工学报,2015,66(7):2702-2708.TIAN Deng-feng,FANG Qing-yan,TAN Peng,et al. Numerical simulation on effect of burner tilting up angle on reheat steam temperature deviation for tangentially fired pulverized-coal boiler[J]. CIESC Journal,2015,66(7):2702-2708.
[15]赵振宁,王晶晶,徐立伟,等. 300 MW机组再热汽温低的原因分析及改造[J].中国电力,2012,45(12):21-25.ZHAO Zhen-ning,WANG Jing-jing,XU Li-wei,et al. Cause analysis for low reheat steam temperature and transformations of 300MW boilers[J]. Electric Power,2012,45(12):21-25.