Heating furnace flue gas temperature
Thread Content
What is the typical range for the flue gas temperature in heating furnaces? How should the fuel consumption and flue gas temperature of heating furnaces be determined?
150-160: excessive heat loss if too high, corrosion due to low dew point if too low. If the sulfur content in the fuel is extremely low, it can be reduced further.
We usually keep it between 174 and 178°C.
The flue gas temperature here is generally around 125°C, and the furnace efficiency has exceeded 90% after the installation of a heavy-duty air preheater as part of the technical upgrades. Fuel is now mainly fuel gas, with a small amount of fuel oil; tower top gas is no longer used.
The smoke exhaust temperature here is around 110
Now, natural gas is used for combustion in heating furnaces, and smoke monitoring shows that the sulfur content is very low. What should be the appropriate exhaust temperature now?
The fuel oil supply has been stopped completely; there is gas detection for natural gas
110 to 130, or it depends on the amount of sulfur compounds in the fuel gas
Without considering the risk of dew point corrosion, the lower the flue gas temperature, the better! For every 15-degree decrease in flue gas temperature, the furnace efficiency increases by 1%, of course! This is a prerequisite for air-assisted combustion; the effect is even more pronounced with an oxygen-rich environment!