| Energy saving and consumption reduction was the important task of coal-fired power plants.Thermal power unit annual average load rate of approximately 70% which leads to the auxiliary equipments were runing on non-rated conditions.Auxiliary selection condition by the largest configuration,and the large margin and unreasonable operation mode, which make the actual operation of thermal power units of auxiliary power ratio higher than the design value.How to reduce auxiliary power ratio has became a key step to successfully carry out the task.This article analysis of operation regulations of parallel pump,and condensate pump and the circulating water pump for research object in steam turbine side, do some research on optimal operation,which provides a reference for reduce the turbine side of the auxiliary power consumption rate and optimal operation auxiliary.(1)Consider the impact of the pressure loss of pipe and pump outlet pressure limits,the variable speed condensate pump of optimal operation of mathematical model was established.The SQP methods was utilized to solve mathematical model of optimal operation of condensate pumps.Optimal operation of variable speed condensate pumps in parllel and optimal operation was obtained.By comparing with the original operation,energy consumption was obtained.(2)By analyzing the relationship between turbine load, condenser vacuum, circulating water inlet temperature and the circulating water flow,optimal operation mathematical model of circulating pump was established which was Based on the theory of optimum vacuum.Solving the optimal operation mathematical model of circulating water pump, the optimal operation of renovation of circulating pump with frequency conversion renovation and two-speed transformation was acquired,and point out frequency conversion renovation could bring more economic benefits than two-speed transformation only if circulating water system was long-term operation with low load and low inlet temperature of circulating water.
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