Abnormal phenomena

such as high flue gas temperature from the air preheater

high temperature of the hot air

large deviation of the exhaust flue gas temperature at A and B side etc.

have recently appeared in operation of 475 t/h CFB boiler in Jingdezhen Power Plant.For this

analysis from aspects of air leakage in the air preheater proper

effects from the flue gas side

and effects from the air side

etc.

has been carried out.Results of analysis show that the main causes leading to the above-mentioned phenmena are as follows:inlet air temperature of the air preheater in practical operation isn't conform to the designed value

and the flow rate of primary air in the process of operation is deviated from the designed value.Hence

improving measures and recommendations

such as strenthening combustion adjustment in operation

ensuring the flow rate of primary air to be about 60%

intensifying inspection and leakage-plugging at A side

and doing best to eliminate air leakage of the air preheater

have been put forward.