Abstract: In order to balance the influence of the cold end system on the generating power and plant consumption rate of the thermal power unit and improve the economy of the unit, a circulating pump operation optimization method based on real-time regulation is proposed. The influence of circulating cooling water flow on condenser pressure is analyzed, and the power consumption change of circulating water pump under different operation modes and the slight power increase curve of unit under 950MW, 750MW and 500MW load are obtained through field test. By actively changing the frequency of variable frequency pump, the change of condenser pressure is monitored in real-time.Combined with the change of circulating pump power consumption and the unit's slightly increased power curve to calculate the unit's net output change, the best operating frequency of variable frequency pump is found through the circulating pump operation optimization test of the unit. The test results show that the method can obtain the optimal operating frequency of the variable frequency pump under different operating loads of the unit. It shows that the proposed method can effectively improve the economy of the unit.

Key words: cold end system, circulating water pump, run optimization