CAJ | 학술논문

某电厂300MW汽轮机低压缸次末级叶片（反向第5级）出汽侧的叶根在运行时发生裂纹现象，在机组进行A级检修时，检验人员在对低压缸末级、次末级、末三级叶片、叶根、围带等部位进行宏观检查时，发现次末级叶片（反向第5级）的叶根第5#、第6#、第20#存在贯穿性横向裂纹。通过进一步开展全面的表面渗透探伤检验发现次末级叶片（反向第5级）的第14#、35#、46#、62#、70#也存在不同程度的裂纹现象。经过与生产厂家配合，找到产生裂纹的真正原因，并对存在裂纹的叶片进行了全部更换和未发生裂纹叶片的后序处理工作，确保了该台汽轮机的安全运行。
모전엄300MW기륜궤저압항차말급협편（반향제5급）출기측적협근재운행시발생렬문현상，재궤조진행A급검수시，검험인원재대저압항말급、차말급、말삼급협편、협근、위대등부위진행굉관검사시，발현차말급협편（반향제5급）적협근제5#、제6#、제20#존재관천성횡향렬문。통과진일보개전전면적표면삼투탐상검험발현차말급협편（반향제5급）적제14#、35#、46#、62#、70#야존재불동정도적렬문현상。경과여생산엄가배합，조도산생렬문적진정원인，병대존재렬문적협편진행료전부경환화미발생렬문협편적후서처리공작，학보료해태기륜궤적안전운행。
300 MW steam turbine low pressure cylinder time last stage blades (reverse rank 5) steam side of blade root crack occur at run time, while the unit for A level maintenance and inspection personnel of low pressure cylinder, at the end of the time, at the end of the triple blade, blade root, at the end of the belt parts such as macroscopic inspection, found that the time the last stage blade reverse (rank 5) of blade root 5, 6, 20 pills perfoliate transverse crack. Through the surface of the further comprehensive penetration testing inspection found that the last stage blade (reverse rank 5) 14, 35, 46, 62, 70, there are different degrees of crack phenomenon. With the manufacturers to cooperate, find the real reason for cracks, and the blade cracks of existence for all replacement and no crack occurs blade order after the processing of the work, ensure the safe operation of the station steam turbine.