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首页> 外文期刊>Combustion Science and Technology >Radiative Heat Transfer in the Dilute Zone of an Air-Fired Circulating Fluidized Bed Combustor and Its Oxy-Fired Retrofit
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Radiative Heat Transfer in the Dilute Zone of an Air-Fired Circulating Fluidized Bed Combustor and Its Oxy-Fired Retrofit

机译：空气循环流化床燃烧器稀薄区的辐射传热及氧燃烧改造

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摘要

A 2D radiation model based on method of lines (MOL) solution of discrete ordinates method (DOM) coupled with spectral line-based weighted sum of gray gases model (SLW) is developed to predict radiative heat fluxes along the dilute zone of the lignite-fired 150 kWt Middle East Technical University (METU) circulating fluidized bed combustor (CFBC) under both air-fired and oxy-fired conditions. The dilute zone is treated as an axisymmetric cylindrical enclosure containing a non-gray, absorbing-emitting-isotropically scattering medium. Radiative properties of particles are evaluated by using geometric optics approximation. Input data for the radiation model under air-fired conditions is obtained from predictions of a comprehensive model previously developed and benchmarked against measurements on the same CFBC burning low calorific value indigenous lignite with high volatile matter/fixed carbon (VM/FC) ratio in its own ash. Input data for the radiation model under oxy-fired conditions, on the other hand, is provided by the predictions of a model of oxy-fired retrofit of the same test rig. Predictions of the radiation model reveal similar axial radiative heat flux distributions for air-and retrofitted oxy-fired combustion. In an attempt to investigate the effect of particle load, radiative fluxes were calculated with and without the participating effect of particles for the same input data in each case. Predictions are found to be higher with particle load and much less sensitive to higher carbon dioxide concentration under oxy-fired conditions.
机译：建立了基于离散坐标法（DOM）的线法（MOL）解的二维辐射模型，以及基于光谱线的灰色气体加权和模型（SLW）的二维辐射模型，以预测沿褐煤稀释区的辐射热通量。在空气和氧气燃烧条件下，燃烧了150 kWt的中东技术大学（METU）循环流化床燃烧器（CFBC）。稀薄区域被视为包含非灰色，吸收发射各向同性散射介质的轴对称圆柱形外壳。通过使用几何光学近似来评估粒子的辐射特性。空气条件下辐射模型的输入数据是从先前开发的综合模型的预测中获得的，并以同一个CFBC燃烧低热值原生褐煤，其高挥发性物质/固定碳（VM / FC）比的测量为基准自己的灰烬。另一方面，在氧燃烧条件下，辐射模型的输入数据由同一试验台的氧燃烧改造模型的预测提供。辐射模型的预测表明，对于空气燃烧和翻新的氧气燃烧，轴向辐射热通量分布相似。为了研究粒子负载的影响，在每种情况下，对于相同的输入数据，计算了有无粒子参与作用时的辐射通量。发现在含氧条件下，随着颗粒负载量的增加，预测值会更高，而对更高的二氧化碳浓度的敏感性则要低得多。

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