Over-temperature of low-temperature superheater
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Over-temperature in the low-temperature superheater: 3.82 MPa, 450°C for our plant’s 75 T/H coal-fired boiler℃； Currently, the outlet temperature of the low-temperature superheater is 440°C. What could be the possible causes? The boiler in our plant is designed to operate at a feedwater temperature of 141 degrees Celsius; in actual operation, the feedwater temperature is 135 degrees Celsius, and this temperature is used for feeding powder via exhaust gas ； The flue gas temperature at the furnace outlet is around 750 degrees, with a variation of 90 degrees; the load is 52–70 T/H.
This is likely due to severe dust accumulation, which has created a flue gas corridor. This results in an overtemperature that is lower than the temperature of the flue gas at the outlet.
The operation of the superheater section at high temperatures, low load conditions, and ash accumulation (as mentioned on the second floor) can all cause overheating of the superheater. A precise assessment requires comparing the actual operating conditions with the design parameters.... This post was last edited by ssmith2007 on 2008-3-17 at 11:32.]