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  

High-temperature Corrosion Tests for the Water Wall of a 1 000 MW Ultra Supercritical Coal-fired Boiler with Double Reheat Cycles

作　　者：岳峻峰[1] 邹磊[1] 张恩先[1] 管诗骈[1] 丁建良[1] 孔俊俊 贾涛[1] YUE Junfeng;ZOULei;ZHANG Enxian;DING Jianliang;KONG Junjun(Jiangsu Frontier Electric Technology Co.,Ltd.,GUAN Shipian,JIA Tao Nanjing 211102,China)

机构地区：[1]江苏方天电力技术有限公司,南京211102

出　　处：《动力工程学报》2018年第10期773-781,共9页Journal of Chinese Society of Power Engineering

基　　金：江苏省产业前瞻与共性关键技术资助项目(BE2017037)

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 ] 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 fol- lowing 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 H2S 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 ul- tra supercritical boiler with double reheat cycles would withstand higher risk of high-temperature corrosion on the water wall than those with single reheat cycle.

关 键 词：超超临界锅炉 二次再热 运行方式 水冷壁 还原性气氛 高温腐蚀 NOx 

分 类 号：TK224.9[动力工程及工程热物理—动力机械及工程]