Automatic Optimization of Frequency Conversion Pump in Cold End System of 1 000 MW Thermal Power Unit
To enhance the thermal efficiency of a 1 000 MW thermal power unit,turbine micro-boost power tests and circulating water pump power consumption tests were conducted,the fitting formulae were derived for the micro-boost power and back pressure of the unit,as well as for the power consumption of the circulating water pump and the frequency of the frequency conversion pump.Additionally,a mathe-matical model was developed for optimizing the operation of the circulating water pump.Analysis revealed five kinds of changes for the frequency of the circulating water pump.Utilizing operational data of the unit from a specific period,simulations were conducted for three typical scenarios of the circulating water pump's operation.The results indicate that when increasing the frequency of the frequency conversion pump leads to positive net profit power for the unit,further increasing the frequency continuously en-hances the net profit power until the frequency reaches 50 Hz;conversely,when increasing the frequency of the frequency conversion pump results in negative net output power for the unit,reducing the frequency initially leads to positive net profit power,and further reduction continues to increase the net profit pow-er.At a frequency of 44 Hz,the net profit power of the unit reaches its maximum value;in cases where increasing or decreasing the frequency of the frequency conversion pump results in negative net profit power for the unit,the original operating frequency of the frequency conversion pump represents the opti-mal operating frequency.
cold end systemcirculating water pumpanalogue testfrequency of frequency conversion pumpoptimal operating frequency
NETL
NSTL
万方数据
