首页> 外文会议>Proceedings of the ASME power conference 2009 >RADIATION MODELING IN OXY-FUEL COMBUSTION SCENARIOS
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RADIATION MODELING IN OXY-FUEL COMBUSTION SCENARIOS

机译:氧燃料燃烧场景中的辐射建模

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摘要

Three gray models for the radiative properties of gases were examined for their usage in oxy-combustion simulations of a full scale boiler with flue gas recycle. Fully coupled computational fluid dynamic (CFD) simulations of a full scale boiler were carried out employing the weighted-sum-of-gray-gases model (WSGGM) at air burn, dry-recycle and wet-recycle conditions. The resulting thermal and composition fields were then frozen and the radiative properties of the gaseous media recomputed employing the Exponential Wide Band Model (EWBM) and correlations for total emissivities of gas mixtures. It is shown that when high CO_2/H_2O ratios were encountered within the boiler such as in dry-recycle scenarios, employing emissivity correlations developed for purely CO_2 media within the models can result in incorrect gas properties. The errors associated with this can be significant when there are large pockets within the furnace where the gas radiation dominates the particle radiation.
机译:检验了三种灰色的气体辐射特性模型,以用于带烟气再循环的大型锅炉的氧燃烧模拟。在空气燃烧,干式循环和湿式循环条件下,采用灰色气体加权总和模型(WSGGM)对全尺寸锅炉进行了完全耦合的计算流体动力学(CFD)模拟。然后冻结所得的热场和成分场,并使用指数宽带模型(EWBM)以及气体混合物总发射率的相关性重新计算气态介质的辐射特性。结果表明,当在锅炉中遇到高CO_2 / H_2O比时(例如在干式循环方案中),采用在模型中为纯CO_2介质开发的发射率相关性会导致不正确的气体特性。当炉子内有较大的气体辐射占主导地位的气穴时,与此有关的误差可能会很大。

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