Low reheating steam temperature and wear in low temperature reheater frequently occurs in domestic power plants.Thus

two 1 025t/h boilers were taking as the examples to conduct transformation by applying several methods

such as decreasing the row number of low temperature reheater tubes

reducing the flue gas velocity and changing several groups of plain tubes for H type finned tubes at low part of the low temperature reheater.A series of calculation was performed

including the boiler thermodynamic calculation

resistance calculation

heating surface calculation for H type finned tubes

side space calculation for low temperature reheater

and so on.The above calculation results show these retrofitting methods are feasible

and can be applied conveniently

which can solve the problems of wear and low reheat steam temperature in low temperature reheaters.