Configuration and Operation Optimization of Circulating Water Pumps for 660 MW Ultra-supercritical Unit

The configuration schemes and operation modes of the circulating water pump of the thermal power unit have significant impacts on the efficiency of the unit. In this paper, the simulation model of the 2×660 MW ultra supercritical unit with the four circulating water pumps are constructed by using the EBSILON platform. Then regarding three different circulating water pump configuration schemes, a variety of operation modes were established accordingly under different loads and circulating water temperatures. Considering the operation cost of the unit and the payback period of investment, different circulating water pump configuration schemes of the unit have been analyzed and compared both technically and economically. The simulation results show that the scheme configured with variable frequency speed control in two circulating water pumps is the optimal solution such that the annual operation income will increase by 5.377 million yuan and the investment payback period is expected to be about 1.741 years.