The spacing tube burst had occurred two times on platen superheater of supercritical boiler no.1 newly constructed in Huaneng Reijin Power Plant.It is believed from analysis that the main causo was the two spacing tubes connected to the final-stage superheater's outlet heater hadn't cutout to make opening

resulting in unsmooth flow of steam and short-time overtemperature of the tubes.For this

some measures

such as insepecting cleanness in headers and tubes

closely monitoring in operation

preventing overtemperature of the tubes etc.

have been put forward.After adaptation

the result is good

the occurrence of similar tube burst being effectively controlled.