本文以某公司2×660 MW超临界燃煤机组低压旁路阀频繁内漏(德国西门子原装进口产品) 为例,经多次解体发现阀座与阀芯的密封面损坏,主要原因是由于杂质、异物等金属硬物卡涩所致,而系统复杂致锅炉侧死角异物难于彻底吹扫干净,一直严重影响机组安全经济运行.通过对低压旁路阀入口加装滤网、阀门研磨处理、减压孔扩孔、更换阀门、旁路阀阀芯改造等几种方案综合对比优缺点,最后确定对阀芯改造并进行可行性分析,实施效果明显,有效防止了阀芯与阀座密封面损伤,彻底解决了低压旁路阀频繁内漏问题,确保了机组运行安全经济性,无疑对具有类似问题的火电机组解决方案有一定的参考意义.%This article takes low-pressure bypass valve frequent internal leakage (Siemens imported products from Germany) of 2 × 660 MWsupercritical coal-fired unit of a certain company as an example. It is found that the sealing surface of the valve seat and the valve core is damaged through repeatedly disintegration, the main reason is due to the impurities, foreign bodies such as hard metal jamming, however, the system is complicated to cause the dead side of the boiler dead corner to be difficult to completely clean, which has seriously affected the safe and economic operation of the unit. By means of equipping with filters at the entrance of low pressure bypass valve, surface mechanical attrition, enlarging pressure-relief vent, replacing the valve, reforming valve core, the bypass valve reconstruction schemes of comprehensive contrasted, Finally, it is accepted to reforming valve core with feasibility analysis, the implementation effect is obvious. As a result, it is significantly effective to prevent the damage of valve core and valve seat sealing surface, completely solved the problem in low pressure bypass-valve frequent leakage, ensuring the safety and economy of the unit operation, providing a reference to the thermal power unit solution with similar problems.
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