The application background of vertical radial flow adsorber used in cryogenic air separation unit was discussed and working principle of dual-bed adsorption was analyzed. A numerical model to describe the heat and mass transfer process in the packed bed was established, revealing the influence law of dual-bed thickness arrangement on adsorption properties and penetration time. The result shows that carbon dioxide at the outlet must be monitored as the end of the reaction. Besides, with the total bed thickness as well as flow rate of the feed air remains constant, the dual-bed adsorber reaches its best performance when the thickness ratio of the two adsorbents is 0. 3.%阐述了径向流吸附器在空分领域的应用背景,分析了双层吸附床的工作原理,建立了径向流双层吸附床数值计算模型,总结了吸附床层厚度布置对吸附性能及穿透时间的影响规律.计算结果表明,吸附反应必须以监控出口处空气中二氧化碳的含量作为反应结束的标志；在吸附床总厚度和空气流量不变的情况下,两种吸附剂的厚度比为0.3时,双层床吸附剂的利用率最高.
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