The selection of flue gas reheat methods in the wet flue gas desulfurization;

In this paper,the causes of(gypsum) scale formation and equipment corrosion,and the problems of flue gas reheat and the oxidation of sulfite pertinent to(separation) of solid from liquid are analyzed.

At temperature about 550 ℃,the weld coarse ccrystal region of HCM2S steel exist tendency of reheat embrittlement,however,the sensitive temperature range of reheat embrittlement is waiting to be further studied and determined.

So the crack is reheat crack,it can be .

The base metal 15CrMoG component and weldability,welding method,welding material,welding structure,technics parameter,welding process and heat treatment were analyzed,the improving welding measure was put forward,which effectively avoided reheat crack and the other welding defects of certain ship boiler pipe.

After analyzing,the source of the welded joint fracture on the sealing structure of the reheater through the penthouse superheater in a 1025t/h boiler is reheat crack which is caused by high rigidity and high stress concentration of the welding joint,excessive welding energy input and heat stress existing in the joint when operating.

The susceptibility of HCM2S steel to reheat cracking has been studied by y-groove restraint weld cracking tests,which confirm the steel's susceptibility in the temperature range between 690(°C)～760(°C).

On the basis of the principles and structures of the cold cracking implant testing machine,the study on the implant equipment of reheat cracking test is reviewed in this paper.

Method of non-destructive inspection、analysis and structure improvement for welded joint fracture on the ceiling sealing structure of boiler reheater;

Study on high temperature steam corrosion of inner tube of superheater and reheater in boiler;

Analyses on tube failures of low temperature reheater of home made DG1025t/h boiler;