Oxy-fuel flame temperature is generally 500 deg C to 800 deg C higher than air-fuel flame temperature. As radiation heat transfer is dependent on the temperature difference from the source to the receiver to the fourth power, oxy-fuel combustion results in a large increase in flame to the material radiation potential. The combustion products from oxy-fuel are also better sources of radiant heat transfer. This is because the majority of air-fuel combustion product is nitrogen which is not as an efficient radiant heat transfer mechanism as carbon dioxide and water vapor that make up the majority of oxy-fuel combustion products.


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