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首页> 外文期刊>International Journal of Heat and Mass Transfer >3D modelling of radiative heat transfer in circulating fluidized bed combustors: influence of the particulate composition
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3D modelling of radiative heat transfer in circulating fluidized bed combustors: influence of the particulate composition

机译：循环流化床燃烧器中辐射传热的3D建模：颗粒成分的影响

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摘要

A three-dimensional model is developed to predict the bed-to-wall radiative heat transfer coefficient in the upper dilute zone of circulating fiuidized bed (CFB) combustors. The radiative transfer equation is solved by the discrete ordi-nates method and Mie scattering theory is applied to calculate the absorption and scattering efficiency factors of particles existing in CFB combustors. Empirical correlations calculate both spacial variation of solid volume fraction and temperature distribution at the wall. The model considers the influences of the particle properties (including particle size distribution, particle optical constants and solid composition) on the radiative heat transfer coefficient. Simulation results show that the particle properties have significant influences on the bed-to-wall radiative heat transfer coefficient in CFB combustors. A very good agreement of predicted results is shown with experimental data.
机译：建立了一个三维模型来预测循环流化床（CFB）燃烧器上部稀薄区的床对壁辐射传热系数。通过离散有机物法求解辐射传递方程，并应用米氏散射理论计算CFB燃烧室中存在的颗粒的吸收和散射效率因子。经验相关性既计算固体体积分数的空间变化，又计算壁的温度分布。该模型考虑了颗粒性质（包括粒径分布，颗粒光学常数和固体成分）对辐射传热系数的影响。仿真结果表明，颗粒性质对CFB燃烧器的床-壁辐射传热系数有重要影响。实验数据与预测结果非常吻合。

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