The propagation of a glowing combustion front in a packed bed of activated carbon (AC) particles was investigated with particular attention to the role of gas phase oxidation of carbon monoxide (CO). The AC particles were loosely packed in a cylindrical quartz column. A N₂/O₂ mixture of varying O₂ concentration flowed through the bed from the bottom. Following ignition at the top of the bed, a glowing combustion front was formed and propagated downwards. Experiments were conducted at different oxygen mass fluxes with varying oxygen concentration and total flow rate. The bed mass loss rate, propagation velocity and temperature of the glowing front, were measured. A transient two-dimensional axisymmetric numerical model considering surface and gas phase reactions and transport properties were developed to describe the combustion phenomena. By comparing with the experiments, the validity of the proposed numerical model was confirmed. The results demonstrated that both the CO₂ and CCO₂ surface reactions contribute to carbon consumption and a constant mass loss rate is attained at a given oxygen flux. The gas phase oxidation of CO acted as a major heat source to sustain the propagation of combustion front through the bed. Suppressing CO oxidation would reduce the propagation velocity but may increase the combustion front temperature because of the prolonged residence time per unit of bed mass.

研究了发光燃烧前沿在活性炭（AC）颗粒填充床中的传播，并特别关注一氧化碳（CO）气相氧化的作用。AC颗粒被松散地填充在圆柱形石英柱中。不同O _2的AN ₂ / O ₂混合物浓度从底部流过床。在床的顶部点火后，形成了发光的燃烧前沿，并向下传播。在不同的氧气质量流量下，随着氧气浓度和总流速的变化进行了实验。测量了床层质量损失率，传播速度和发光前沿的温度。建立了考虑表面和气相反应以及传输特性的瞬态二维轴对称数值模型，以描述燃烧现象。通过与实验的比较，证实了所提出数值模型的有效性。结果表明，C O ₂和C CO _2均表面反应会导致碳消耗，并且在给定的氧气通量下可获得恒定的质量损失率。CO的气相氧化充当主要热源，以维持燃烧前沿通过床层的传播。抑制CO氧化会降低传播速度，但会由于延长每单位床质量的停留时间而增加燃烧前沿温度。