The high temperature corrosion phenominon had discovered in temporary repair after four months in operation of one supercritical once-through boiler

the said corrosion occurred on the fire-side of water-wall tubes

which situated on the centre of left and right side walls near the region of burners.It is believed from analysis that the main causes leading to high temperature corrosion are:high sulpher content in the fuel coal

high temperature on the wall of tubes

and opposed arrangement of double air-tuned cyclone burners on the front and rear walls

etc..For these

some countermeasures

such as reasonable air distribution

coating sprayed onto the erosion region

controlling the fineness of pulverised coal

avoiding localized overtemperature on the heating surface etc.

have been put forward.