The tube-burst of superheater in large-capacity boilers is an improtant factor resulting in forced shutdown of units

and a large number of tube-burst are caused by overtemperature of tube walls.Hence

in order to accurately understand the wall temperature distribution on platen superheater of the boiler

a measurement test of inner and outer wall temperature has been carried out on the platen superheater of boiler equipped for a supercritical 600 MW unit in Dabieshan Power Plant

collecting in real-time the data variation of wall temperature inside and outside the furnace

finding out the relationship between wall temperatures of platen superheater inside and outside the furnace

and a cognate model between them being given by using the fitting method

and calculation and analysis of three-dimensional wall-temperature distribution being carried out.By using the cognate model developed forthe platen superheater's wall temperature inside and outside the furnace and the temperature to measured at measuring points retainable for a long time outside the furnace

the temperature of overtemperature tube-section inside the furnace can be predicted.Besides

the reliability of results obtained from computing program for three-dimensional wall temperature of the platen superheater can also be verified by using said model.