What temperature does boiler flue reach?
The flue-gas temperature of a typical boiler could be anywhere in the range of 300 to 500 degrees Fahrenheit range. As a result, the extra oxygen could have entered the boiler at 70 degrees F and exit at 400 F.
What is the temperature of flue gas?
The typical furnace outlet temperature of flue gases is usually around 1200 °C which will decreases gradually along the pathway of heat transfer, while the temperature of the flue gases going to stack is around 150 °C.
What temperature is flue condensate?
around 135°F.
Flue gas will form and condense on a heat exchanger and in the boiler stack when it falls below its dew point, and this occurs when the return water temps of the system are around 135°F.
How do you control flue gas temperature?
Using an integrated or downstream economiser, the flue gas temperature can be reduced to 120 – 140°C, depending on the economiser design, which reduces the flue gas loss significantly. During this process, the heat in the flue gases is transferred to the boiler feed water flowing in countercurrent.
How do you reduce the temperature of a gas flue?
Utilize Flue-Gas Recirculation for Lowering NOX Emissions Flue-gas recirculation (FGR) commonly is used to control thermal NOX. It does this by reducing the burner flame temperature and staging the combustion of air and fuel.
What causes flue gas temperature?
The flue gas temperature is decisive for the combustion efficiency of steam boilers without flue gas condensation. The feed water used in the economiser to cool the flue gases in systems with thermal deaerating is however not colder than 103°C.
What is the dew point temperature of the water Vapour in the combustion flue products?
If the combustion end products are cooled, the dew point of the combustion process of methane with standard air is reached at a temperature of 59.6à‚°C. At that temperature, the exhaust gas is saturated with water vapour. Cooling of the exhaust gas below 59.6à‚°C will make that water vapour condense.
What should flue integrity be?
› Whenever possible, the air inlet duct should be checked for flue integrity to ensure there is no leakage of any products of combustion. An O2 reading of less than 20.6% (the correct figure is approximately 20.9%) or a CO2 reading of 0.2% would indicate contamination.
Why must flue gas temperatures in conventional furnaces be kept high?
The answer is REDUCING TEMPERATURE RISE AND CONDENSING FLUE GASES. High-efficiency furnaces condense exhaust gases and reduce the temperature rise across the heat exchanger.