Propagation of glowing combustion front in a packed bed of activated carbon particles and the role of CO oxidation
Propagation of glowing combustion front in a packed bed of activated carbon particles and the role of CO oxidation
复制标题
活性炭颗粒填充床中炽热燃烧前沿的传播以及 CO 氧化的作用
DOI：
10.1016/j.proci.2020.05.041
复制
发表时间：
2020-07
影响因子：
3.4
通讯作者：
Yuji Nakamura
中科院分区：
文献类型：
--
作者：
Jian Gao;Xiaobin Qi;Dongke Zhang;Tsuneyoshi Matsuoka;Yuji Nakamura
研究了一氧化碳（CO）气相氧化在活性炭（AC）颗粒填充床中燃烧前沿的传播过程。AC颗粒松散地填充在圆柱形石英柱中。不同O2浓度的N2/O2混合物从底部流过床。在床的顶部点火之后，形成炽热的燃烧前沿并向下传播。实验在不同的氧气质量流量与不同的氧气浓度和总流量进行。测量了床层质量损失率、热锋传播速度和温度。建立了考虑表面反应、气相反应和输运特性的二维轴对称瞬态燃烧数值模型。通过与实验结果的对比，验证了所建数值模型的有效性.结果表明，C单键O2和C单键CO2的表面反应都对碳的消耗有贡献，在一定的氧流量下，碳的质量损失速率是恒定的. CO的气相氧化是燃烧前沿在床层中传播的主要热源。抑制CO氧化会降低传播速度，但可能会增加燃烧前沿的温度，因为每单位床质量的停留时间延长。
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/O2mixture of varying O2concentration 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 Csingle bondO2and Csingle bondCO2surface 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.
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影响因子：
7.4
作者：
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通讯作者：
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DOI：
10.1016/j.proci.2016.06.159
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期刊：
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