A wide band correlated-k distribution model for the gas radiative property under pressurized oxygen-enriched combustion

Based on the improved wide-band correlated-k distribution model, a sectional treatment model of CO 2 4.3μm multiple band was developed to calculate the radiative properties of water vapor and carbon dioxide gas mixtures under pressurized oxygen-enriched combustion mode. The calculation result was compared with line-by-line calculation and simplified model. It is shown that the results obtained by the sectional treatment model are in agreement with those obtained by using line-by-line calculation method with the increasing of pressure. And the comparison with simplified model indicates that the sectional treatment model is more accurate. According to the water vapor and carbon dioxide gas mixtures in the furnace of the coal-fired boiler under pressurized oxygen-enriched combustion mode, the absorption coefficients of each bands under different pressures were calculated. The predicted radiation intensity and emissivity of the gas mixtures under different temperature and pressure were obtained. The results show that the radiation intensity and emissivity of the gas mixtures increase with the rising of temperature at the same pressure. When the pressure is raised to 1.5 MPa from 0.1 MPa gradually, the radiation intensity and emissivity of the gas mixtures increase correspondingly. However, the relative change of the radiation intensity and emissivity decreases with the rising of pressure. © 2010 Chinese Society for Electrical Engineering.