In a 135 MW unit circulation fluidized bed(CFB) boiler

the reheater desuperheating water amount was large and tube burst occurred several times due to local area over heating

deformation and wear

bed material blocking

and other factors.Two much heating surface area caused flow deviation in platen reheater was considered as the major reason.Thus

several countermeasures were taken

such as improving the steam entrance mode for inlet steam header

decreasing the reheater heating surface area and height

and increasing the inner diameter of the inlet steam header.After the improvement

the desuperheating water flow decreased and the tube burst problems in reheater reduced.