立式径向流吸附器传热传质过程模拟研究

In order to reveal the laws of heat and mass transfer of competitive adsorption of CO₂ and H₂O in the adsorption layers of vertical radial flow adsorber, based on the existing experimental data of CO₂ and H₂O adsorption of alumina and molecular sieve, CFD (Computational Fluid Dynamics) technology is used to study the binary adsorption process of CO₂ and H₂O in the adsorption layers. A mathematical model of heat and mass transfer of competitive adsorption of CO₂ and H₂O in the adsorption layer is established, the relationship between flow uniformity and adsorption performance is analyzed, and the adsorption performance of four types of adsorbers is compared. The results show that the flow uniformity in the adsorption process is a parameter reflecting the flow field distribution in the adsorbers, which has a similar change law with the adsorption performance and can be used to reflect the adsorbent utilization rate and adsorption performance of vertical radial flow adsorbers. The CO₂ and H₂O penetration regions of centripetal Z-type are different, while those of the other three structures are the same. The CO₂ penetration region and main adsorption region of centripetal π-type are the adsorption layer near the inlet side, and those of the other three structures are the adsorption layer opposite to the inlet side. In terms of the adsorber performance, the centrifugal π-type has the best performance, the pressure drop is 12.0% lower than that of centripetal Z-type, and the adsorption time is 2.34 times that of centripetal Z-type. The research results provide a theoretical reference for the selection and design of vertical radial flow adsorber.