梨园水电站水轮发电机组顶盖排水系统优化改造

Optimum Retrofit of Roof Drainage System of Hydro-generator Set in Liyuan Hydropower Station

顶盖排水系统是水轮发电机组必要的辅助系统之一,不论机组在发电态亦或是停机态,顶盖积水主要由导叶中轴套漏水和顶盖与大轴间漏水等原因引起,顶盖排水泵作为顶盖排水系统的核心,其作用是排走渗漏积水,防止积水过多引发水淹水导轴承,导致机组非计划停运。以梨园水电站机组顶盖排水泵运行时间长为例,深刻剖析其原因并对系统进行了优化改造,大大提高了顶盖排水系统的可靠性。

Roof drainage system is one of the necessary auxiliary systems for hydro-generator units.Whether the unit is in power or shutdown state,water accumulation on roof is mainly caused by water leakage between the bushing in the guide vane and between roof and large shaft.Roof drainage pump is the core of roof drainage system.Its function is to drain seepage,prevent excessive seepage from causing flooding of the guide bearing and lead to unplanned outage of the unit.Taking Liyuan Hydropower Station as an example,this paper profoundly analyzed the reasons for the long operation time of roof drainage pump and carried out optimization and modification to the system,which greatly improved the reliability of roof drainage system.