Through overall checking of the blasting segment of HT convective superheater and metallographic and mechanic analysis of base metal at the blasting position,the actual reasons for tube blasting of HT convective superheater are found out.

Cause analysis and solution for boiler high-temperature superheater tube bursting during 600MW supercritical unit startup commissioning;

Through comprehensive stress calculation of outlet header of high-temperature superheater,the stress defects during operation are found out,and shortages in boiler design are pointed out,at the same time,and the ultimate causes of crack between header and snake tubes are found.

By the physico-chemical testing and analysis on the rupture and leakage failure of high-temperature superheater pipe of No.

Serious coking and ash depositions,that occurred in the high temperature superheater zone of a certain 220 t/h high pressure boiler,are being analyzed,showing that the main causes are: low melting point of the coal ash,too low a feed water temperature as well as soot-blower service defaults.

With the aid of scanning electron microscope(SEM) and X-ray diffractometer(XRD),an analysis is performed on scales formed on inner walls of G102 steel high temperature superheater tubes.

The reason of DG410/100-2 boiler high temperature superheater tube rupture are analyzed,the contradiction between keeping nomal main steam temperature and high temperature heat surface overheating,which is created after a nomal boiler changed into a peak shaving boiler are expounded.

The failed superheater tube of a supercritical boiler in a power plant was studied by means of macrofractographic and metallographic examination,chemical composition analysis and mechanical property testing.

At present the conventional arrangement mode is widely used for HT superheaters of HT HP CFB boilers.

Failure analysis on the pipe of convection surperheater in 440t/h boiler