Abstract
As the flue gas composition in oxy-fuel combustion is mainly CO_2, the correct gas emissivity data are needed to design oxy-fuel combustion furnace. Therefore the gas emissivity has been measured in the complete combustion area from AAP (After air port) using oxy-fuel combustion test furnace. In the case of LPG combustion, ratio of oxy-fuel combustion to air combustion for gas emissivity without ash was 2.4, and this value was almost same to the value calculated by the existing engineering theory. In the case of coal combustion, ratio of oxy-fuel to air for gas emissivity with ash particles was 1.6, and the absorption coefficient of particulate layers of oxy-fuel was almost same to that of air.
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