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电站200 MW汽轮机对轮螺栓,尤其是高、中压对轮螺栓,在常温下承受着轴向推力的拉应力和下张口引起的交变拉应力;预紧力和负荷突然变化传递扭矩时强大剪切力.近年来国内已发生多台次对轮螺栓断裂事故,直接威胁着电站的安全运行.因此,除在选材、结构加工、安装检修,各个环节加强监督外,机组小修或事故停机时,不拆卸条件下探伤检查是目前急待解决的课题.
200 MW steam turbine turbine wheel bolts, especially high and medium pressure on wheel bolts, bear tensile stress under axial thrust at normal temperature and alternating tensile stress caused by the next Zhangkou; sudden changes in preload and load power transmission torque strong Shearing force.In recent years, several sets of round bolt rupture accidents have occurred in our country, which directly threaten the safe operation of power station.Therefore, in addition to the supervision of material selection, structural processing, installation and maintenance, and supervision in all aspects, minor repair or accident shutdown , Do not disassemble under the condition of inspection is the urgent problem to be solved.