超超临界1000MW机组锅炉屏式过热器爆管原因分析  

CAUSE ANALYSIS OF TUBE-BURST ON PLATEN SUPERHEATER OF BOILER EQUIPPED FOR ULTRA-SUPERCRITICAL 1000 MW UNIT

作　　者：马崇[1] 陈韶瑜[1] 

机构地区：[1]天津市电力公司技术中心,天津300384

出　　处：《热力发电》2011年第11期91-94,共4页Thermal Power Generation

摘　　要：某电厂超超临界1 000MW机组锅炉屏式过热器同一根管连续发生2次爆管事故,经对爆管宏观检查,化学成分分析,拉伸、金相、扫描电镜和能谱分析等,表明爆管的主要原因是管内有异物堵塞,造成管子通流面积减少使蒸汽对管子的冷却作用降低,局部处于超温状态,高温蠕变强度降低所致。On a same pipe of the platen superheater in boiler of ultra-supercritical 1 000 MW unit in one power plant,two times of tube-burst have successively occurred.Through macroscopic inspection,chemical composition analysis,tensile test,metallographic examination,scanning electronic microscopic and energy spectrum analysis etc.,it shows that the main cause leading to tube-burst is the blockage of foreign maters in the said tube,resulting in reduction of flow passage area in the tube,making the cooling effect of steam onto the tubes to be reduced,and a part of them was in an overtemperature condition,thereby,the high-temperature creep strength being reduced.

关 键 词：电厂 过热器管 泄漏 超温 爆管 

分 类 号：TK223.32[动力工程及工程热物理—动力机械及工程]