By adopting three-dimentional model

the simulation and analysis of worn-out on connecting pipe bundle of low-pressure reheater nearby the furnace outlet suffured from gas-phase flow field distribustion

movement of flyash

and concentration distribution etc.in the flue duct of boiler concerning 600 MW unit have been carried out.Results show that the flue gas velocity

particle's concentration and average collision velocity of particles nearby the furnace outlet all are larger due to influence of solid-gas two-phase flow distribution in the flue duct

thereby

the velocity of wornout on connecting pipes of the low-pressure reheater is also larger.It is recommended to install wornout-resistant covers of 6 mm thickness onto the windward surface of horizontal I-shaped pipe bundle of the low-pressure reheater between bottom of the first row connecting pipe and the other connecting pipes

as well as installing wornout-resitant covers with 3 mm thickness onto the other remained parts.