超临界锅炉人孔门角部水冷壁开裂原因分析及处理建议

Reason Analysis and Treatment Suggestions on Water Wall Cracking at the Corner of Manhole Door of Supercritical Boiler

某660 MW超临界机组运行21 000 h后,锅炉人孔门角部水冷壁上发生开裂和泄漏,影响了机组的安全运行。分析锅炉人孔门角部水冷壁失效的原因,对人孔门及其附近水冷壁进行热应力数值模拟计算,并对人孔门罩壳结构进行优化,减小其附近水冷壁受力,以保障机组的安全运行。

After a 660 MW supercritical unit was operated for 21 000 h, cracks and leakage occurred on the water wall at the corner of the boiler manhole door, which affected the safe operation of the unit. The failure reason of the water wall at the corner of the boiler manhole door is analysed, the thermal stress of the manhole door and its nearby water wall is simulated, and the shell structure of the manhole door is optimized to reduce the stress of the nearby water wall, so as to ensure the safe operation of the unit.