论文部分内容阅读
针对富氧燃烧方式下由高体积分数水蒸气和CO2混合构成的烟气辐射传热难题,推导出描述非灰气体辐射特性的宽带关联k分布模型与离散坐标法相结合的计算公式.以文献中O2/CO2燃烧方式下炉内水蒸气和CO2的生成为例,采用宽带关联k分布模型计算了不同算例下混合气体的辐射强度和壁面热流量,并与统计窄谱带模型、全光谱关联k分布模型以及灰体加权和模型的计算结果进行了比较.结果表明:宽带关联k分布模型与统计窄带模型的计算结果吻合较好;与文献中的两个模型进行了对比,其计算精度有所提高,并且对混合气体的处理更加简便灵活,适用于O2/CO2燃烧方式下烟气辐射特性的计算.
Aiming at the problem of radiative heat transfer of flue gas composed of high volume fraction of water vapor and CO2 mixed in oxy-fuel combustion mode, a formula for calculating the combination of broadband associated k-distribution model and discrete coordinate method to describe the non-gray gas radiation characteristics is derived. Taking the generation of water vapor and CO2 in the furnace under O2 / CO2 combustion mode as an example, the radiation intensity and wall heat flux of mixed gas under different examples were calculated by using the broadband k-distribution model and correlated with the statistical narrowband model and the full spectrum k distribution model and the gray body weighted model are compared.The results show that the broadband associated k distribution model is in good agreement with the statistical narrowband model and compared with the two models in the literature, And the treatment of the mixed gas is more simple and flexible, which is suitable for calculating the radiation characteristics of the flue gas under the O2 / CO2 combustion mode.