Performance analysis of temperature swing adsorption for CO2 capture using thermodynamic properties of adsorbed phase

Abstract The present work describes the theoretical research frameworks mainly for the thermodynamic properties of adsorbed phase, which is applied in the field of temperature swing adsorption (TSA) for CO 2 capture. The heat of adsorption and specific heat capacity of the adsorbed phase are quantitatively analyzed based on the adsorption isotherm data of CO 2 on activated carbon at the temperature ranging from 273 K to 358 K. Employing such thermodynamic properties of adsorbed CO 2 , the effect of four cyclic parameters on the energy-efficiency performance of 4-step TSA processes is evaluated based on the thermodynamic carbon pump theory including the minimum separation work and the second-law efficiency. The results show that the regeneration heat has been increased with considering adsorbed phase, and the amount of sensible heat for the adsorbed phase accounts for approximately one-sixth to one-fourth of the total thermal energy consumption. However, the corresponding second-law efficiencies just drop 1.43–7.21%. Although the total thermal energy consumption is higher than the traditional absorption technologies, the second-law efficiencies are slightly higher due to lower heating requirements and auxiliary power.

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