1000 MW超超临界二次再热锅炉降低水冷壁高温腐蚀影响的试验研究
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摘要
针对1 000MW超超临界二次再热锅炉燃烧器特点,对水冷壁近壁面烟气成分和水冷壁壁温进行了测试,分析了运行O_2体积分数、煤粉细度、入炉煤硫质量分数、一次风量、燃尽风(AGP)水平摆角、AGP风量和偏置辅助风(CFS)风量等因素对水冷壁高温腐蚀的影响。结果表明:提高运行O_2体积分数是预防水冷壁高温腐蚀的有效方式;煤粉变细可改善水冷壁近壁面还原性气氛;随入炉煤硫质量分数的升高,水冷壁近壁面CO和H_2S最高体积分数升高;减小AGP风量和增大CFS风量有助于减弱水冷壁近壁面还原性气氛;AGP水平摆角对水冷壁近壁面还原性气氛影响不大;减小一次风量会恶化水冷壁高温腐蚀;在相同炉内还原性气氛下,超超临界二次再热锅炉比超超临界一次再热锅炉面临的水冷壁高温腐蚀风险更高。
According to the features of the burner applied in a 1 000 MW ultra supercritical coal-fired boiler with double reheat cycles,experimental tests were carried out to measure the water wall temperature and the distribution characteristics of gas components near the water wall,so as to analyze the effects of following factors on the high-temperature corrosion over the water wall,such as the oxygen concentration,fineness of pulverized coal,sulfur content in fuel,primary air flow rate,offset angels of air-grade part(AGP),AGP air flow rate,and the air flow rate in the concentric firing system(CFS),etc.Results show that the reductive atmosphere near the water wall could be reduced effectively by increasing the oxygen concentration and reducing the fineness of pulverized coal.With the rise of sulfur content in fuel,both the CO concentration and H_2S concentration increase near the water wall.Decreasing AGP air flow rate and increasing CFS air flow rate are helpful to reduce the high-temperature corrosion.The offset angels of AGP have little influence on the reductive atmosphere near the water wall.Decreasing primary air flow rate will deepen the high-temperature corrosion.In the same furnace reducing atmosphere,a 1 000 MW ultra supercritical boiler with double reheat cycles would withstand higher risk of high-temperature corrosionon the water wall than those with single reheat cycle.
According to the features of the burner applied in a 1 000 MW ultra supercritical coal-fired boiler with double reheat cycles,experimental tests were carried out to measure the water wall temperature and the distribution characteristics of gas components near the water wall,so as to analyze the effects of following factors on the high-temperature corrosion over the water wall,such as the oxygen concentration,fineness of pulverized coal,sulfur content in fuel,primary air flow rate,offset angels of air-grade part(AGP),AGP air flow rate,and the air flow rate in the concentric firing system(CFS),etc.Results show that the reductive atmosphere near the water wall could be reduced effectively by increasing the oxygen concentration and reducing the fineness of pulverized coal.With the rise of sulfur content in fuel,both the CO concentration and H_2S concentration increase near the water wall.Decreasing AGP air flow rate and increasing CFS air flow rate are helpful to reduce the high-temperature corrosion.The offset angels of AGP have little influence on the reductive atmosphere near the water wall.Decreasing primary air flow rate will deepen the high-temperature corrosion.In the same furnace reducing atmosphere,a 1 000 MW ultra supercritical boiler with double reheat cycles would withstand higher risk of high-temperature corrosionon the water wall than those with single reheat cycle.
引文
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[13]宁新宇.国电谏壁发电厂扩建工程1×1 000 MW超超临界燃煤机组#13锅炉额定出力达标投产试验报告[R].南京:江苏方天电力技术有限公司,2011:12-13.
[14]肖琨,张建文.600MW四角切圆燃烧锅炉防高温腐蚀方案研究[J].锅炉技术,2016,47(4):48-52.XIAO Kun,ZHANG Jianwen.Research on high temperature corrosion prevention scheme for a 600MW tangential fired boiler[J].Boiler Technology,2016,47(4):48-52.
[15]汪华剑,方庆艳,周怀春,等.空气深度分级对低挥发分煤燃烧过程影响的研究[J].热能动力工程,2009,24(6):777-781.WANG Huajian,FANG Qingyan,ZHOU Huaichun,et al.Study of the influence of the deep airstaged burning on a low-volatile coal combustion process[J].Journal of Engineering for Thermal Energy and Power,2009,24(6):771-781.
[2]薛江涛,马运翔,张耀华,等.1 000 MW二次再热汽轮机启动步序及问题处理[J].中国电力,2016,49(11):119-123,164.XUE Jiangtao,MA Yunxiang,ZHANG Yaohua,et al.Startup sequence and troubleshooting of 1 000-MW double reheat steam turbine[J].Electric Power,2016,49(11):119-123,164.
[3]殷亚宁.二次再热超超临界机组应用现状及发展[J].电站系统工程,2013,29(2):37-38.YIN Yaning.Application status and development of USC unit with double reheat cycles[J].Power System Engineering,2013,29(2):37-38.
[4]杨新民,吴恒运,茅义军.超超临界二次再热机组再热汽温的控制[J].中国电力,2016,49(1):19-22.YANG Xinmin,WU Hengyun,MAO Yijun.Reheat steam temperature control of an ultra supercritical unit with second reheat cycle[J].Electric Power,2016,49(1):19-22.
[5]赵世飞,徐钢,王春兰,等.一种普适性电厂节能技术:原煤低温预干燥[J].动力工程学报,2016,36(6):486-492.ZHAO Shifei,XU Gang,WANG Chunlan,et al.A universal energy-saving technology in coal-fired power plant:low-temperature coal pre-drying[J].Journal of Chinese Society of Power Engineering,2016,36(6):486-492.
[6]陈鸿伟,李永华,梁化忠.锅炉高温腐蚀实验研究[J].中国电机工程学报,2003,23(1):167-170.CHEN Hongwei,LI Yonghua,LIANG Huazhong.Experimental study on boiler high temperature corrosion[J].Proceedings of the CSEE,2003,23(1):167-170.
[7]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,2016,36(2):91-98.QIN Ming,JIANG Wenting,WU Shaohua.Numerical simulation of sulfide distribution on furnace walls with air-staged combustion[J].Journal of Chinese Society of Power Engineering,2016,36(2):91-98.
[8]殷尊,蔡晖,侯召堂,等.国产1 000 MW超超临界机组水冷壁管典型横向裂纹分析[J].材料科学与工程学报,2015,33(3):442-447.YIN Zun,CAI Hui,HOU Zhaotang,et al.Study on typical transverse crack of water wall tube of 1 000MW domestic ultra-supercritical units[J].Journal of Materials Science and Engineering,2015,33(3):442-447.
[9]岑可法,周昊,池作和.大型电站锅炉安全及优化运行技术[M].北京:中国电力出版社,2003:322-325.
[10] VALENTINE J R,SHIM H S,DAVIS K A,et al.CFD evaluation of waterwall wastage in coal-fired utility boilers[J].Energy&Fuels,2007,21(1):242-249.
[11] NAJIMA S,MORINAGA M,HAYASHI S.Method for identifying areas of sulfidation on water-wall tubes in coal-fired boilers[J].Oxidation of Metals,2016,85(3/4):283-296.
[12]姚露,陈天杰,刘建民,等.组合式贴壁风对660MW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 Tianjie,LIU Jianmin,et al.Influence of closing-to-wall air on combustion process in660 MW opposed firing boiler[J].Journal of Southeast University(Natural Science Edition),2015,45(1):85-90.
[13]宁新宇.国电谏壁发电厂扩建工程1×1 000 MW超超临界燃煤机组#13锅炉额定出力达标投产试验报告[R].南京:江苏方天电力技术有限公司,2011:12-13.
[14]肖琨,张建文.600MW四角切圆燃烧锅炉防高温腐蚀方案研究[J].锅炉技术,2016,47(4):48-52.XIAO Kun,ZHANG Jianwen.Research on high temperature corrosion prevention scheme for a 600MW tangential fired boiler[J].Boiler Technology,2016,47(4):48-52.
[15]汪华剑,方庆艳,周怀春,等.空气深度分级对低挥发分煤燃烧过程影响的研究[J].热能动力工程,2009,24(6):777-781.WANG Huajian,FANG Qingyan,ZHOU Huaichun,et al.Study of the influence of the deep airstaged burning on a low-volatile coal combustion process[J].Journal of Engineering for Thermal Energy and Power,2009,24(6):771-781.