运用新控制策略显著降低给水泵再循环阀汽蚀

Reducing Cavitation of Recirculation Valve of Feed- water Pump Significantly with New Control Strategy

为减少汽动给水泵再循环阀的汽蚀及降低汽动给水泵低负荷时的能耗,通过研究分析,采用全新的再循环阀控制策略,并在实际使用中进行验证。新的控制策略使汽动给水泵再循环阀在机组正常运行中保持全关闭状态,只有在汽动给水泵启动、停运过程中才需要开启,最大限度减少了再循环阀的汽蚀,并显著降低了汽动给水泵低负荷时的能耗。实践证明,所采用的新控制策略能够实现汽泵的节能降耗,延长再循环阀使用寿命,并保证汽动给水泵和锅炉给水流量的安全。

In order to reduce the cavitation of recirculation valve of steam feed pump and reduce its energy consumption at low load, a new control strategy for recirculation valve is adopted through the research and analysis , and it is verified in practice.A new control strategy makes steam feed recirculation valve to be fully closed during the normal operation of the unit , and itonly needs to open in the start -up and shutdown process of steam feed pump , which minimizes the cavitation of recirculationvalve and greatly reduces the energy consumption of steam feed pump at low load .The practice shows that the new controlstrategy can realize the energy saving of steam feed pump , prolong the service life of recirculation valve and ensure the safetyof feed -water flow of steam feed pump and boiler .