【摘要】 采用实验研究和理论分析相结合的方法研究了体积分数为0.15³%超低浓度甲烷在0.5%Pd/Al₂O₃（质量分数）催化颗粒鼓泡流态化状态下的催化燃烧特性,根据其在密相区和稀相区的流动及反应特点,建立了低浓度甲烷催化燃烧反应模型,并在不同温度、进气甲烷浓度、床层高度等工况下进行了模型预测及与实验数据的对比分析。研究结果表明:考虑了稀相区中催化颗粒飞溅,模型计算数据与实验数据吻合较好,误差在5%以内;反应器出口无量纲甲烷浓度随着床层温度的升高、进气甲烷浓度的降低以及床层高度的升高而降低;通过与活塞流,全混流反应模型的对比分析,进一步验证了所建立的数学模型能够较好地反映超低浓度甲烷在鼓泡流态化状态下的催化燃烧特性。更多还原

【Abstract】 Combustion characteristic of ultra-low concentration methane with its volume fraction a range of 0.15%³%fluidized catalytic combustion was studied experimentally and theoretically and 0.5%Pd/Al₂O₃（mass fraction） was employed as catalytic particles.The model of ultra-low concentration methane catalytic combustion reaction was established,according to the flow and reaction characteristics of dense and freeboard zones.A comparative analysis of model prediction and experimental data was carried out under the conditions of different bed temperature,inlet methane concentration and bed height.The results show that calculated results agreed well with experimental data considering a small amount of catalyst particles was splashed into the freeboard zone.And the maximum deviation was about 5%.The dimensionless methane concentration at the outlet of reactor declined with the increase of bed temperature and bed height,while raised with increasing inlet methane concentration.A comparative analysis of the established model with plug flow and mixed flow models was carried out,which further verified the developed model could reflect better the characteristics of low concentration methane catalytic combustion under the condition of bubbling fluidized.更多还原