某660MW超超临界汽轮机轴承箱油挡漏油分析及处理

Analysis and Treatment of Oil Leakage from Bearing Housing Oil Baffle in a 660 MW Ultra Supercritical Pressure Steam Turbine

对某660 MW超超临界汽轮机的3号轴承箱油挡漏油事故进行了分析。结果表明:发生漏油事件的主要原因为润滑油排烟风机入口压力偏低、轴封供汽量不足和中压排汽缸保温不当等。通过进行汽轮机润滑油及轴封系统运行调整、修缮汽轮机本体保温等措施,漏油点得以消除。该案例分析可以为电厂生产运维人员提供参考。

An analysis was conducted on an oil leakage accident in the No. 3 bearing housing oil baffle of a 660 MW ultra supercritical pressure steam turbine. Results show that, the main causes of the oil leakage are three aspects, including low inlet pressure of lubricating oil exhaust fan, insufficient steam supply of shaft seal, improper heat insulation of medium pressure steam exhaust chamber. By adjusting the operation of the turbine lubricating oil and shaft seal system, and repairing the heat insulation of the turbine, the oil leakage point can be eliminated. This case study can provide reference for operation and maintenance personnel of power plant.