Four 1000 MW ultra-supercritical coal-fired units had been installed in Huaneng Yuhuan Power Plant.The pipe-blowing with steam for units no.1 and no.2 in the first-phase project was using different schemes

namely pressure-stabilizing and pressure-reducing respectively.The pipe-blowing with steam for units in the second-phase project draws fully on the experience of pipe-blowing with steam for units in the first-phase project

selecting a scheme of two-stage pipe-blowing under pressure-reducing condition.Comparing with pressure-stabilizing method

the pressure-reducing method not only has good effectiveness

but also can save time

water

and fuel.