Regarding the temperature difference in the superheater header
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For a three-waste fluidized combustion furnace with a capacity of 75 t/h, the temperature difference between the two points at the superheater outlet header has increased from 5–8°C previously to 15–20°C now. The temperature measurement points as well as the DCS system have been checked and replaced to ensure they are functioning properly; in addition, measurements taken using a temperature gun on-site showed that the temperature difference across the wall was as high as 25°C. So, apart from ash accumulation on the internal heat exchange tubes, what other possibilities could explain such a situation? (The distance between temperature measurement points is around 1.5m)
Is there any experienced driver who can take a look?
The wall temperatures differ by so much – could it be due to uneven flow of hot flue gas?
It would be best to draw a diagram showing which specific part of the tank it is. Overheating of the tubes increases the likelihood of uneven flow.