Structural Characterization and NO Generation Characteristics of Coal Char under O2/CO2 Atmosphere

The evolution of pore structure and functional groups of coal char in different stages of Shenhua coal combustion process in O2/CO2 atmosphere was studied by the low temperature nitrogen adsorption method, the scanning electron microscopy and the FTIR method. The relationship between the pore structure, oxygen-containing functional groups and NO generation characteristics of coal char under different inlet oxygen concentrations was analyzed. The result shows that the overall pore structure and shape of pulverized coal particles change continuously with the combustion; and the oxygen-containing functional groups on the surface of coal char indicate multi-peak changes and are related to NO generation. The oxygen concentration poses a larger impact on the change in coal particle size, oxygen-containing functional groups and NO generation; and there is an oxygen concentration that optimizes the reduction effect of the oxygen-containing functional group on NO.