The pipe-blowing process and its technical features for boiler of ultra-supercritical 660 MW unit no.3 in Huaneng Jinggangshan Power Plant have been presented.Owing to the boiler water circulating pump hadn't been installed at the time of pipe-blowing

therfore

it is called pipe-blowing using steam under condition without the boiler water circulating pump.By using the motor-driven feed-water pump of neighbouring unit

the pipe-blowing of unit without feed-water pump has been realized.The drain from boiler is reclaimed into the deaerator

alleviating the problem of having not enough water to carry out the pipe-blowing due to the condenser hasn't prepared for water-intaking.Though it is different from the pipe-blowing condition of boiler for conventional units

however

the effectiveness of pipe-blowing is fully conformed to the requirements defined in specifications

playing certain exemplary role.