The numerical control technology for minimum flow rate in feed-water pump is a technology adopting calculation method to substitute the original orifice measuring method for obtaining the flow rate in feed-water pump.Through application of said technology onto feed-water pumps of 300 MW unit in Liaoning Tieling Power Plant

the feasibility of using numerical control technology has been verified.It is obtained from analysis that the error produced in adopting numerical control technology to control the flow rate of feed-water pump is smaller

the on-line monitoring functions for flow rate behavior in feed-water pumps can be realized

the reliability of control is high

the throttling loss of feed-water flow rate can be reduced

the efficiency of pump group can be enhanced.