CAJ | 학술논문

某医院有两台WNS10－1.25－Y／Q燃气锅炉，连续发生多次回燃室前管板烟管管口泄漏故障，分析了缺陷产生的原因，并提出了解决方法。在长期交变热应力作用下，烟管管口角焊缝熔合线区域产生内部微裂纹，微裂纹在交变热应力（断口分析的形貌为韧窝）的作用下逐步扩展，形成内部宏观（金相检验时发现了多条内部裂纹，且裂纹走向是平行于烟管轴向的方向），裂纹沿着轴向向烟管前后端扩展，最终扩展到管端，并穿透管壁，导致锅炉汽水从裂口泄漏。
모의원유량태WNS10－1.25－Y／Q연기과로，련속발생다차회연실전관판연관관구설루고장，분석료결함산생적원인，병제출료해결방법。재장기교변열응력작용하，연관관구각한봉용합선구역산생내부미렬문，미렬문재교변열응력（단구분석적형모위인와）적작용하축보확전，형성내부굉관（금상검험시발현료다조내부렬문，차렬문주향시평행우연관축향적방향），렬문연착축향향연관전후단확전，최종확전도관단，병천투관벽，도치과로기수종렬구설루。
There exists 2 WNS10-1.25-Y/Q gas boilers in a certain hospital, and the leakage faults have occurred in the tube mouth of smoke tube on front tube sheet of reversal chamber for several times continuously.The reasons of defects were analyzed, and the solving methods were put forward.Under the long term action of tremendous ther-mal stress, the internal micro cracks came into being in the fillet weld junction region on tube mouth of smoke tube. The micro cracks expanded gradually under the action of tremendous thermal stress ( the morphology of fracture a-nalysis is dimple) , and formed the internal macro ( multiple internal cracks were found in metallographic examina-tion, and the crack path was parallel to the axial direction of smoke tube) .The cracks expanded to the front end and back end of smoke tube, and finally reached the tube end, then penetrated the wall of tube, resulting in leak-age of steam-water from the gap.