The condition for putting steam air-heater into service in thermal power plants is that the air temperature at the cold end of air preheater is lower than the average local atmospheric temperature(i.e.the designed temperature of inlet air coming into the air preheater)

or taking the inlet air temperature of the air preheater provided by the boiler manufacture works as a basis.But the steam air-heater in service may result in corrosin of the air preheater

even result in ash blockage etc..Through analysis and comparison

it is believed that the condition of putting steam air-heater into serviece should be based on the comprehensive cold end average temperature calculated according to practical burned coal sort

to ensure the comprehensive cold end average temperature of air preheater to be higher than the calculated value.practice shows this method being safe and reliable.