超超临界压力直流锅炉垂直管屏水冷壁的失效分析及防爆策略  

Failure Analysis of Vertical Water-wall Panels of Ultra-supercritical Pressure Once-through Boiler and the Anti-explosion Strategies

作　　者：徐洪[1] 

机构地区：[1]江苏省电力试验研究院,南京211100

出　　处：《动力工程学报》2010年第5期329-335,共7页Journal of Chinese Society of Power Engineering

摘　　要：介绍了我国1 000 MW超超临界压力机组直流锅炉的三大流派,分析了超超临界压力直流锅炉垂直管屏水冷壁失效的原因.结果表明:垂直管屏水冷壁失效的直接原因是水冷壁入口节流孔板存在磁性氧化铁沉积物污堵现象,根本原因是给水全挥发处理方式欠佳引起省煤器入口给水铁离子含量较高.提出了有效的防爆措施:一旦水冷壁出现过热现象,说明节流孔板可能存在较严重污堵,应尽快伺机割管检查确认;采用特殊的化学清洗工艺对节流孔板进行局部清洗;给水采用加氧方式处理.Three sects of domestic 1 000 MW ultra-supercritical pressure once-through boilers were introduced. The causes for failure of water-wall with vertical tube panels of ultra-supercritieal pressure oncethrough boilers were analyzed. Results show that the direct cause for failure of water-wall with vertical tube panels is that the throttles located at entrance of water-wall have been blocked by deposits of magnetite pollutants. While the fundamental cause is the high content of ferri ion at the inlet of economizer caused by poor all volatile feedwater treatment. Efficient anti-explosion strategies are put forward. Once overheating phenomenon of water-wall occurs, which indicates that serious blocking of throttles might exist, tube cutting inspection should be taken as soon as possible. Local cleaning should be carried out for the throttles by a special chemical cleaning procedure. And the feedwater should adopt oxygenated treatment.

关 键 词：超超临界机组 流动加速腐蚀 沉积 水冷壁失效 全挥发处理 加氧处理 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]