Effect of Carbon Dioxide On Soot Distribution From Oxy-Coal Combustion

An oxy-fuel combustion combined with carbon capture sequestration (CCS) technology is known to be one of emerging clean coal technologies for carbon dioxide (CO2) emission reduction. Soot is useful due to an enhanced radiative heat transfer in a boiler furnace, while its formation should be suppressed to avoid the loss of carbon content. In this study, soot distribution measurement was carried out with laser induced incandescence in an oxy-fuel diffusion flame. A methane diffusion flame was used for ignition of coal which is introduced on an oxidant side. The coal is one of coals which are imported to South Korea being used at its coal-fired power plant. Carbon dioxide as inert gas was additionally supplied to the oxidant to simulate the N2-free oxidation condition and further investigate the effects of CO2 on coal-derived soot formation and mechanisms. The flame length made solely from coal burning were also observed to provide the oxidation rate of coal as a function of oxygen fractions in a flue gas.