上犹江电站#2水轮机技术改造

Technical Innovation of No.2 Turbine in Shangyoujiang Hydropower Station

针对上犹江电站1998年4台水轮机增容改造时出现的转轮气蚀严重、局部裂纹的问题,于2017年在参考转轮的基础上经过数值分析优化设计,成功研制出水力性能优秀的JF3057水轮机转轮对该电站#2机进行了技术改造。改造后电站原型水轮机经实测显示,新转轮出力更大、效率更高,且机组振动摆度也正常,但在一定的负荷范围内出现了强烈噪声并伴有金属轰鸣声。2018年叶片出水边修型处理后,强烈噪声和金属轰鸣声基本消除。新转轮经过5年多运行实践考验及周期观察,气蚀现象和局部裂纹问题均得到解决,#2水轮机改造取得成功。

In view of the serious cavitation erosion and local cracks of water turbine runner after the capacity expansion and transformation of four runners in Shangyoujiang hydropower station in 1998, JF3057 turbine runner with excellent hydraulic performance was developed through numerical analysis and optimization design in 2017 for the innovation of unit#2 of the power station. The measured results of the prototype turbine after innovation show that the new runner has greater output and higher efficiency, and the vibration and the shaft runout are normal, but strong noise and metal roar within a certain load range exist in the turbine. In 2018, the strong noise and metal roar were basically eliminated after the blade outlet edge modification. After 5-year operation test and periodic inspections of the runner, the cavitation phenomenon of the new runner has been greatly improved, and the transformation of No. 2 turbine has been successful.