Abstract: The electric pump is usually used to feed water for boiler during the startup and shutdown processes of 600MW supercritical units, the turbofeed pump starts to work until the unit load reaches 30% BMCR. Through continuous exploration, one power plant has used successfully the turbofeed pumps to feed water for boiler of 600MW supercritical unit during the whole process of startup and shutdown, and the electric feed pump was only as backup, this optimal way of feeding water is effective on saving electricity and increases the economical efficiency of unit operation.

Key words: process of unit start-up and shut-down, turbo-feed pump, feed water mode, economical efficiency, 600MW supercritical unit