The thesis adopts the method of site checking,measuring and mark analyzing,associated with analyzing the abrasion feature of boiler,finds out the real reason of low temperature superheater tube leakage and take pertinent precaution measures.

Through improvement and perfection,this technique has witnessed satisfactory application result on the low temperature superheaters and economiz.

Based on analysis of the welding performance of SA106C materials and the rated load condition of low temperature superheater header,this paper finds the cause that the head produce cracks bug.

Cause analysis of external corrosion on low temperature reheater of boiler;

The leakage and defects of heating surfaces of the water wall,double-tube superheater,economizer,and low temperature reheater of the four 1 025 t/h boilers of a power plant are analyzed comprehensively.

A comprehensive performance test was made for low temperature reheater of St45.

Wear treatment for low-temperature reheater pipes of M417A boiler;

High hat like sealing structures are adopted for the low-temperature reheater roof-passing tubes of boiler No.

Through macroscopic examination and microstructure analysis, the causes leading to tube-burst in low-temperature reheater of a 1021 t/h boiler during operation in a period less than one year have been analysed, and disposal measures being put foreard.