Optimization and system development of circulating water pump in thermal power plant based on theory of energy value
Zhang Lei1, Wei Long1, Feng Fei1,2, Tu Zhongqiang1, Xu Zhigao2
（1.Department of Mechanical Technology, Nanjing College of Chemical Technology, Nanjing, Jiangsu 210048, China; 2. School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China)
Energy efficiency and fuel economy are the key subjects in the profit driven electricity generation market. The objective functions of an energy consumption optimization model and an economic optimizationmodel have been established based on engineering thermodynamics and energy value theory. These models took account of the market value difference between coal and electricity. The circulating pump optimal operation online scheduling was derived by calculating steam turbine back pressure correctioncurve and the pump and condenser features. A thermal power plant optimized circulating water system was developed with PI real time database in.NET platform. Data were read from PI database periodicallyfor pre processing and steady state discrimination to determine the most effective pumping by using Genetic Algorithm. The optimal gains can be found and operational recommendations can be given from the system. The system has been applied on six units in a power plant. In a certain condition, it can save power of 975.46 kW and increase revenue of 171.18 RMB／h through stopping a circulating pump of unit 1＃ and 2＃. The system significantly reduces the risks introduced by human operators and inefficient pump adjustment. Its user friendly interface makes the system easy to use and promote.
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