Directing against four failures of tube-burst on high temperature superheater in one power plant of Yangcheng County

through macroscopic analysis

chemical composition analysis

mechanical behavior and metallographic test

and calculation

it is believed that the four failures of tube-burst all are resulted from short-time overtemperature.For this

preventive measures

such as optimizing the pressure and temperature of blow off water from the boiler

strengthening combustion control during start-up of units after hydraulic test of the boiler and superheater

avoiding short-time overtemperature resulted from water plug in u-shaped tube of the superheater

have been put forward.After realization of said measures

the tube-burst phenomena of high-temperature superheater have been effectively controlled.