摘要
针对某燃气-蒸汽联合循环机组余热锅炉高压蒸发器泄漏事故,通过检查和取样分析对高压蒸发器失效机制及原因进行综合分析,同时提出相应的防范措施。结果表明:异物堵塞导致局部汽化率增加,管内介质在距高压蒸发器上集箱1.5~5.2 m处发生异常相变,汽水混合物变为饱和蒸汽后含水量降低,溶解携带盐分减少使该蒸发器管内壁沉积结垢,产生垢下腐蚀,导致管壁减薄,最终造成该高压蒸发器管泄漏。
To solve the problem of the leakage of the high pressure evaporator of a waste heat boiler in a gas-steam combined cycle unit,a comprehensive analysis was conducted on the failure mechanism and cause of the high pressure evaporator by means of macroscopic inspection and sampling analysis,while corresponding countermeasures were proposed.Results show that,the increase of the vaporization rate is resulted from the blockage by alien objects,and with the abnormal phase transition of the working medium occurring at the position of 1.5-5.2 m away from the high pressure evaporator header,the water content is decreased through the change of steam water mixture to saturated steam.The deposition and scaling in the inner wall of the high pressure evaporator is in process with the decrease of the dissolution of salt,which leads to the deposition corrosion.The leakage of the high pressure evaporator is finally caused by the reduction of the tube wall thickness.
作者
周柏成
Zhou Baicheng(Jiangsu Guoxin Yizheng Heat&Power Co.,Ltd.,Yangzhou 225000,Jiangsu Province,China)
出处
《发电设备》
2024年第1期53-56,61,共5页
Power Equipment
关键词
余热锅炉
高压蒸发器
泄漏
异物堵塞
汽化率
waste heat boiler
high pressure evaporator
leakage
blockage by alien objects
vaporization rate
