Simulation Study on Switching Operation Law of Feed Water Pumps in Multi-pump Parallel Feed Water System

As one of the main subsystems of the nuclear power system, the switching operation law of the feed water pumps in the multi-pump parallel feed water system is critical to the system operation economy and system operation characteristics. In this study, the simulation model of multi-pump parallel water supply system is established by using the system simulation support software APROS, and the accuracy of the model is verified according to the rated design value. Based on this, the switching operation law and system dynamic characteristics of feed water pump are studied through the simulation of linear rising and falling load under different switching conditions. The research results show that, for this research object, when the switching point under high load condition is selected as 70% of the rated flow, and the switching point under low load condition is selected as 30% of the rated flow, good system dynamic response can be obtained, and high economy of feed water pump operation can be maintained. In addition, the low load condition is more sensitive to the disturbance caused by the switching of feed water pump. Under low load conditions, if the switching conditions are not selected properly, the system will trigger overpressure discharge in the process of load reduction.