ANALYSIS OF ABNORMAL TEMPERATURE FOR FLUE GAS EXHAUSTED FROM 475t/h CFB BOILER IN JINGDEZHEN POWER PLANT
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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.