Directing against the troubles of frequent burst-leakage occurred in recent years on water-wall and platen reheater of boilers in one power plant

the main causes resulting in burst-leakage have been analysed. It is believed from analysis that the burst-leakage of platen reheater is mainly due to high-temperature oxidation failure resulted from over-temperature. Through adopting measures in operation

such as controlling the fineness of pulverized coal

heigtening the grade of tube material

applying spray coatings on outer surface of tubes for preventing high-temperature oxidation etc.

the number of occurred burst-leakage troubles has been reduced. The thickness-reducing of water-wall tubes is due to high-temperature corrosion

after taking measures

such as protection by using LF7 coating

retrofitting burners

strengthening wall-temperature monitoring

etc.

occurrence of troubles has been prevented.