The second phase project of a nuclear power plant adopts localized nuclear-grade steam-assisted feedwater pumps,and in the process of commissioning,the start-up time of feedwater pumps exceeded the standard,the speed could not be stabilized after the start-up,and the over-speed tripping events occurred in the process of start-up repeatedly.The speed regulation system of the steam-assisted feedwater pump is modeled and analyzed,and the working characteristics of the electronic governor,electrical converter,pneumatic positioner,pneumatic speed booster and other components are studied,and the effects of pneumatic speed booster with different flow coefficients on the dynamic response characteristics of the pneumatic actuator are analyzed and compared through tests.By replacing the pneumatic speed booster with small flow coefficient and optimizing the governor parameters,the robustness of the steam-assisted feedwater pump speed regulation system is improved,and the problem of feedwater pump start-up failure is solved.The research process and results can be used as a reference for the design of the speed control system of steam-assisted feedwater pump of domestic nuclear grade,and also have important guiding significance for the optimization of the regulation system parameters and the enhancement of the robustness of the pneumatic actuator,and the handling of other similar problems.
关键词
核电厂/汽动辅助给水泵/调速系统/鲁棒性/气室/气动执行机构/增速器/定位器
Key words
Nuclear power plant/Steam-asisted feedwater pump/Speed regulation system/Robustness/Air chamber/Pneumatic actuator/Speed booster/Positioner
维普
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