Assessing the Role of Particles in Radiative Heat Transfer during Oxy-Combustion of Coal and Biomass Blends

IF 1.5 Q3 ENGINEERING, CHEMICAL
G. Krishnamoorthy, Caitlyn M. Wolf
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引用次数: 20

Abstract

This study assesses the required fidelities in modeling particle radiative properties and particle size distributions (PSDs) of combusting particles in Computational Fluid Dynamics (CFD) investigations of radiative heat transfer during oxy-combustion of coal and biomass blends. Simulations of air and oxy-combustion of coal/biomass blends in a 0.5 MW combustion test facility were carried out and compared against recent measurements of incident radiative fluxes. The prediction variations to the combusting particle radiative properties, particle swelling during devolatilization, scattering phase function, biomass devolatilization models, and the resolution (diameter intervals) employed in the fuel PSD were assessed. While the wall incident radiative flux predictions compared reasonably well with the experimental measurements, accounting for the variations in the fuel, char and ash radiative properties were deemed to be important as they strongly influenced the incident radiative fluxes and the temperature predictions in these strongly radiating flames. In addition, particle swelling and the diameter intervals also influenced the incident radiative fluxes primarily by impacting the particle extinction coefficients. This study highlights the necessity for careful selection of particle radiative property, and diameter interval parameters and the need for fuel fragmentation models to adequately predict the fly ash PSD in CFD simulations of coal/biomass combustion.
评估颗粒在煤和生物质混合燃烧过程中辐射传热中的作用
本研究评估了在计算流体动力学(CFD)研究煤和生物质混合燃料全氧燃烧过程中辐射传热过程中模拟颗粒辐射特性和燃烧颗粒粒径分布(psd)所需的保真度。在0.5 MW燃烧试验装置中对煤/生物质混合物的空气和氧燃烧进行了模拟,并与最近的入射辐射通量测量结果进行了比较。评估了燃烧颗粒辐射特性、颗粒脱挥发膨胀、散射相函数、生物质脱挥发模型以及燃料PSD中采用的分辨率(直径间隔)的预测变化。虽然壁面入射辐射通量预测与实验测量结果比较合理,但考虑燃料、焦炭和灰分辐射特性的变化被认为是重要的,因为它们强烈影响入射辐射通量和这些强辐射火焰中的温度预测。此外,粒子膨胀和直径间隔也主要通过影响粒子消光系数来影响入射辐射通量。该研究强调了在煤/生物质燃烧CFD模拟中,需要仔细选择颗粒辐射特性和直径间隔参数,以及需要燃料破碎模型来充分预测粉煤灰PSD。
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来源期刊
Journal of Combustion
Journal of Combustion ENGINEERING, CHEMICAL-
CiteScore
2.00
自引率
28.60%
发文量
8
审稿时长
20 weeks
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