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针对增压富氧燃烧方式下烟气中高浓度H2O和CO2混合气体的辐射换热问题,以改进的宽带关联k分布模型为基础,建立了CO2气体4.3μm多谱带合并带的分段处理模型,并与逐线计算和简化模型的计算结果进行对比,结果表明,随着压力的增大,该分段模型与逐线计算结果吻合较好,与简化模型相比,计算精度大大提高。针对电站燃煤锅炉采用富氧燃烧方式炉内H2O和CO2的生成状况,基于以上模型计算得出不同压力下H2O和CO2各谱带的吸收系数,并计算了不同温度和压力下混合气体的辐射强度和发射率,结果显示:在相同的压力下,混合气体的辐射强度和发射率随着温度的升高而升高;当压力由0.1MPa逐渐升至1.5MPa时,辐射强度和发射率逐渐增大,但二者的相对变化却逐渐减小。
Aiming at the radiation heat transfer problem of mixed gas with high concentration of H 2 O and CO 2 in flue gas under the mode of pressurized and rich oxygen combustion and based on the improved broadband associated k distribution model, a subsection model of CO2 gas 4.3 μm multi- , And compared with the results of line-by-line calculation and simplified model. The results show that the model agrees well with the line-by-line calculation as the pressure increases, and the calculation precision is greatly improved compared with the simplified model. In view of the formation of H2O and CO2 in the oxyfuel combustion mode of coal-fired boilers in power station, the absorption coefficient of each band of H2O and CO2 at different pressures was calculated based on the above model, and the radiation of mixed gas under different temperature and pressure The results show that under the same pressure, the radiation intensity and the emissivity of the mixed gas increase with the increase of the temperature. When the pressure gradually increases from 0.1MPa to 1.5MPa, the radiation intensity and emissivity gradually increase Increase, but the relative change between the two has gradually decreased.