The unstable operation and the mechanical seal frequent leakage of two motor-driven feedwater pumps in Shaanxi Huadian Pucheng first phase project directly affect the load as well as safe and economy operation.

The low lubrication oil pressure defect in steam turbin set of a power plant has existed since the fluid coupling motor-driven feedwater pump was put into service.

Based on characteristics of motor-driven feedwater pump of supercritical units,the paper discusses the configuration mode and its function,capacity and initial investment for motor-driven feedwater pump of 2×660MW supercritical units of Yangxi Power Plant in Guangdong Huanxia,and it can give supplier a theoretic basis for final decision-making.

The feasibility study of the alteration of variable frequency speed regulation motor-drive FW pump is expatiated,and the integrated technological and economic comparison is introduced.

Taking economy estimation of military electric power 200 MW unit all capacity motor-driven pump changed to steam feed pump as an example to analyse methods of energy saving.

The enhancement of motor-driven feed-water pump’s efficiency can bring more better economic benefits for the power plant.

For this,through retrofit and debugging of the equipments,the zero specific consumption for condensate pumps,circulating-water pumps,and motor-driven feed-water pumps during water-supplying process in start-up of the units .

The stability in operation and regulating performance of steam-driven feed pumps is improved, so steam-driven feed pumps should take the place of motor-driven feed pumps.

Boiler feed mode is proposed to optimize during startup and shutdown period,turbine-driven feed pump instead of motor-driven feed pump is used to control boiler feed-water,the economy of units is improved.