Study on the CO2 Capture Separation Process by Temperature Swing Adsorption Based on Nitrogen-Doped Porous Carbon

CO2 capture technology is a crucial methodto achieveglobal carbon emission reduction, and the benefits of the physicaladsorption method in the post-combustion CO2 capture technologyare low energy usage and running costs. Nitrogen-doped porous carbonis selected as a solid adsorbent due to its high specific surfacearea and excellent adsorption selectivity. This study uses nitrogen-dopedporous carbon prepared in experiment to determine its main properties,and the adsorption equilibrium isotherm is fitted. The adsorptionbed model is established using ANSYS Fluent to simulate the heat andmass transfer of the adsorption process and fluid flow and is verifiedby the published experimental data. Temperature swing adsorption (TSA)is divided into three stages: adsorption, desorption, and cooling.The effects of different inlet velocities and porosities on adsorptionand desorption performance are studied. The results reveal that themesh verification and experimental verification are in good agreementwith the results so that the numerical model can be used for speciestransport processes of various sizes, geometric shapes, and othermixed gases. It is essential to mention that this adsorption cycleprocess can recover excellent purity and decent recovery and productivityof product gases, which is of great significance for the practicalapplication and industrialization of carbon capture technology.