In radiation process, a variety of models can be used to represent the spectral radiative properties of combustion gases. In coal combustion, the high level of soot concentration brings higher complexity to the formulation. Several pieces of research are found, comparing different radiation models usually applied to idealized laboratory situations. Only a few works explore the behavior of such models in real scale applications, such as coal-fired furnaces. Comparisons among different arrangements of the SGG and WSGG models were carried out by means of CFD simulations, applied to a boiler of a real 160 MW coal-fired power plant. Five different cases were simulated. The most simple case was set with a fixed absorption coefficient SGG model, while the most detailed case was achieved by employing a WSGG model with gas and soot absorption coefficients overlay. Temperature fields were well represented by all cases, with maximum deviations of 6%. Predictions on radiative heat flux for the SGG models were significantly lower than the WSGG simulations, with relative deviations up to 16.46%. Even though deviations on radiative heat flux are significant, results suggest the suitability of simple gray gas models in fast assessments of industrial applications such as coal-fired furnaces.

在辐射过程中，可以使用多种模型来表示燃烧气体的光谱辐射特性。在煤燃烧中，高浓度的烟灰为配方带来了更高的复杂性。发现了几项研究，将通常应用于理想化实验室情况的不同辐射模型进行了比较。只有少数作品探讨了这种模型在实际应用中的行为，例如燃煤炉。通过CFD模拟对SGG和WSGG模型的不同布置进行了比较，并将其应用于实际的160 MW燃煤电厂的锅炉。模拟了五种不同的情况。最简单的情况是使用固定的吸收系数SGG模型进行设置，而最详细的案例是通过使用覆盖了气体和碳烟吸收系数的WSGG模型实现的。温度场在所有情况下都能很好地表示出来，最大偏差为6％。SGG模型的辐射热通量预测显着低于WSGG模拟，相对偏差高达16.46％。尽管辐射热通量的偏差很大，但结果表明，简单的灰色气体模型适用于快速评估工业应用（例如燃煤炉）的情况。