Optimal operation of circulating water pump in thermal power plant under different weather conditions
(1.College of Water Conservancy and Hydropower Engineering， Hohai University， Nanjing， Jiangsu 210098， China； 2.Huadian Electric Power Research Institute， Hangzhou， Zhejiang 310030， China； 3.East China Electric Power Design Institute of China Power Engineering Consulting Group， Shanghai 200063， China)
Abstract：Based on the circulating water pump (CWP) optimal operation model, with the whole circulating cooling water system as the subject, taking influences of different weather conditions fully on CWP optimal operation into consideration, a new kind of equivalent profit curve and corresponding net earning power curve was drawn to directly guide CWP optimal operation.Taking a 660 MW power plant for example, the proposed and previous equivalent profit curves were compared and analyzed. The results show that,the proposed equivalent profit curves can always effectively guide the CWP optimal operation. However, the CWP operation mode based on the existing equivalent profit curves is not always optimal, and the CWP optimal operation mode possibly changes due to the working CWP operation modes. In the meantime, by applying the proposed equivalent profit curves and net earning power curves, the CWP optimal operation in the 660 MW power plant was technically and economically analyzed. By comparing net earning power curves under different loads, it is found that, under summertime high temperature conditions, the operation cost of circulating cooling water system under low load may be higher than that under high load.
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