某厂新装中温中压１２ＭＷ抽汽供热汽轮发电机组，试生产阶段发生端轴封磨损事故。揭缸消除事故后，机组再次投入运行，汽缸水平法兰结合面出现局部泄漏，在较高负荷时泄漏量随负荷增减相应变化。负荷低时，泄漏现象消失。 造成漏汽的原因疑为过早拆除汽缸保温层，高温应力致使 A factory newly installed medium temperature and pressure 12MW extraction steam turbine generator set, the trial production stage end seal wear accident. Uncover tank after the accident was eliminated, the unit put into operation again, the cylinder horizontal flange joint surface of the local leakage, leakage at higher load changes with load changes accordingly. When the load is low, the leak disappears. The reason for the leakage caused by the suspected premature removal of the cylinder insulation, caused by high temperature stress