超临界四角切圆燃烧锅炉运行方式对水冷壁高温腐蚀影响的试验研究  

Effects of Operation Mode on High Temperature Corrosion of the Water Wall in a Supercritical Tangential Firing Boiler

作　　者：邹磊[1] 岳峻峰[1] 管诗骈[1] 张恩先[1] 丁建良[1] ZOULei YUE Junfeng GUAN Shipian ZHANG Enxian DING Jianliang(Jiangsu Frontier Electric Technology Co. , Ltd. , 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》2017年第11期861-869,共9页Journal of Chinese Society of Power Engineering

摘　　要：针对某630 MW超临界四角切圆燃烧锅炉水冷壁存在的高温腐蚀问题,对水冷壁近壁面烟气成分(O2、CO及H2S)进行了测试,分析了运行O2体积分数、煤粉细度、入炉煤含硫量、紧凑燃尽风(CCOFA)风量、分离燃尽风(SOFA)风量及周界风量等因素对水冷壁高温腐蚀及NOx排放特性的影响.结果表明:高温腐蚀发生区域表现出明显的强还原性气氛;增大运行O2体积分数,同时保证风量沿炉膛高度方向上的合理分配可减弱水冷壁近壁面还原性气氛;煤粉细度对水冷壁近壁面还原性气氛的影响较小;随着入炉煤含硫量的增加,水冷壁近壁面H2S体积分数增大,O2和CO体积分数则变化不大;较小的CCOFA风量及适当的SOFA风量有利于减轻水冷壁高温腐蚀;周界风量对主燃烧区下部壁面区域还原性气氛的影响较大,运行时应适当减少周界风量.To deal with the high temperature corrosion of the water wall in a 630 MW supercritical tangential firing boiler,experimental tests were carried out for the distribution characteristics of gas components（O2,CO and H2S）near water wall,and subsequently the effects of following factors on the high temperature corrosion and NOxemission were analyzed,such as the oxygen concentration,fineness of pulverized coal,sulfur content in fuel,and the flow rate of close coupled over-fire air（CCOFA）,separated over-fire air（SOFA）and circumferential air,etc.Results show that high temperature corrosion mainly occurs in areas under strong reducing atmosphere;the reducing atmosphere near water wall could be decreased by increasing the oxygen concentration and reasonably setting the air distribution along vertical direction of the furnace;the fineness of pulverized coal has little effect on the reducing atmosphere near water wall;with the rise of sulfur content in fuel,the H2S concentration increases near water wall,while the O2 and CO concentration remain basically unchanged;smaller CCOFA and proper SOFA flow rate are helpful to reduce the high temperature corrosion of water wall;the flow rate of circumferential air has great influence on the reducing atmosphere near water wall at the bottom of main burners,and it is proposed to appropriately reduce the flow rate of circumferential air in the process of operation.

关 键 词：超临界锅炉 四角切圆燃烧 水冷壁 运行方式 高温腐蚀 还原性气氛 NOX排放 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]