超超临界1000MW机组双切圆锅炉水冷壁近壁区气氛分布特性  

Distribution characteristics of reductive atmosphere close to water wall of an ultra supercritical 1000MW boiler with dual tangential circle

作　　者：陈旭伟 何利军 陈国庆 范臻 蔡培 CHEN Xuwei;HE LijuN;CHEN Guoqing;FAN Zhen;CAI Pei(Guodian Taizhou Power Generation Co.,Ltd.,Taizhou 225327,China;Guodian Science and Technology Research Institute Co.,Ltd.,Nanjing 210023,China)

机构地区：[1]国电泰州发电有限公司,江苏泰州225327 [2]国电科学技术研究院有限公司,江苏南京210023

出　　处：《热力发电》2018年第11期115-122,共8页Thermal Power Generation

摘　　要：以某电厂超超临界1000 MW机组双切圆锅炉为研究对象,采用现场试验的方法测量了不同运行工况下锅炉水冷壁近壁区烟气成分(O_2、CO和H_2S),分析了二次风配风方式、分离燃尽风(SOFA)风量、周界风风量、同层燃烧器二次风风量分配方式等因素对水冷壁近壁区O_2、CO和H_2S体积分数的影响。结果表明:受炉内流场影响,主燃区和还原区热角区(2、3、5、8号角)还原性气氛比较强;通过调整二次风配风方式和SOFA风量,适当提高主燃区和还原区的风量,可以减弱炉膛四周水冷壁近壁区还原性气氛,缓解水冷壁高温腐蚀;通过调整同层燃烧器各角二次风风量和周界风风量,适当提高1、4、6、7号冷角燃烧器射流刚性,可减弱热角水冷壁近壁区还原性气氛。Taking an ultra supercritical 1 000 MW boiler with dual tangential circle as the research object,the flue gas components(O2,CO and H2S)near the water wall were detected under different operational conditions.Moreover,the influences of several factors,such as the second-air distribution mode,the separated over-fired air(SOFA)flow rate,the circumferential air flow rate and the second-air flow rate distribution at the same layer burners,on the volume fraction of O2,CO and H2S close to the water wall were analyzed.The results show that,affected by the special aerodynamic field inside the furnace,the areas close to burners 2,3,5 and 8 have the relative stronger reductive atmosphere and higher temperature.Regulating the secondary air distribution and SOFA flow rate,as well as increasing air flow rate of the primary combustion zone and reducing zone,could weaken the reductive atmosphere near the water wall.The reductive atmosphere near the hot corner water wall could be decreased by adjusting the circumferential air flow rate and second-air flow rate distribution at the same layer burner,and increasing the second air jet momentum of burners 1,4,6 and 7.

关 键 词：燃煤锅炉 双切圆燃烧 高温腐蚀 水冷壁 烟气成分 还原性气氛 风量 燃烧器 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]