In order to solve the problems of long time consuming

complex operation and feed-water flow rate large fluctuation in the process of manual pumping of steam-driven feed water pump of ultra supercritical units

an automatic pumping control strategy based on adaptive rate adjustment of unit state parameters was proposed. This strategy designs three speed rising stages based on the state of outlet valve incorporated into the pump. In each stage

the parameters affecting the pump performance

such as the feed water flow deviation

pressure difference to the main pipes

and the opening degree of steam-driven pump recirculation valve

are taken as adjustment factors to adjust the pump rate adaptively. Moreover

the steam-driven pump recirculation valve is optimized according to different load conditions to make the pumping process fast and stable. The control system of an ultra supercritical 660 MW unit is configured to realize automatic pumping under multiple working conditions. The actual operation process shows that

the automatic pumping control strategy can not only reduce the operation intensity of the operator

but also keep the feed water flow rate fluctuation within 50 t/h and make the time-consuming less than 8 min during the pumping process

which effectively improves the stability and rapidity of the units pumping process.