Heating furnace
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In the constant-pressure furnace, the temperature in the convection chamber has risen from 350 degrees to 400 degrees, while the flue gas temperature has increased from 170 degrees to 230 degrees. The air preheater remains under negative pressure; is there any effective way to control the flue gas temperature?
Ensure an adequate oxygen level inside the furnace; adjust the air intake volume and the flue dampers. If that doesn’t work, increase heat exchange.
If the medium temperature is sufficient, extinguish a few fires
In the radiation chamber, the flame in the burner does not burn completely; it moves to the convection chamber where, in an oxygen-rich environment, secondary combustion begins. By replacing the nozzle, reducing the amount of gas used, lowering the flame height, and controlling the oxygen level at 2-3%, as well as adjusting the flue dampers and the burner’s butterfly valves, it is possible to ensure that the flame remains stable without drifting, with a concentrated shape – an orange-yellow color being ideal. If none of the above methods work, check whether there is corrosion or blockage in the air preheater; if that’s the case, replace the air preheater.