Cause analysis of the high temperature reheater blast at No.2 boiler in Ningxia Zhongning Power Generation Co., Ltd.;

4-YM4 boiler high temperature reheater installation technics from combination scheme, welding procedure and heat treatment technics.

According to the problems of corner joint leakage of high temperature reheater header in 6th boiler of Matou Power Plant,after the causes are founded through system dynamic testing and checking of original design operation situation from the aspets of design,structure mechanics andoperation,the high temperature reheater is retrofitted,and the effect is well.

To aim at serious problems such as pipe overheating,rapid velocity of oxidation,pipes deformation which exist in high-temperature reheater of No.

Reason analysis and treatment of deformation of high temperature reheater tube

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.