Abstract
The availability of relevant and efficient technologies to capture, store, and use carbon dioxide (CO2) is critical to reduce CO2 concentrations in the atmosphere and reach net-zero CO2 emissions. In this study, we captured CO2 by combining an adsorbent-packed heat exchanger with an internal heating and cooling process of thermal swing adsorption. A two-stage process was used to achieve CO2 purity greater than 90 % in the simulated flue gas because the single-stage process could only concentrate CO2 to ∼ 50 % purity. The results revealed that the volume of the second-stage adsorption heat exchanger is approximately-one-third of the first-stage adsorber because the CO2 concentration of the second-stage feed gas increases in the first stage, thereby leading to an increase in the adsorption capacity of the second stage. Maximum CO2 purity of 95 % was achieved using the rate of purge air flow and regeneration time in the second-stage regeneration process as operating parameters. The overall CO2 recovery ratio was ∼ 60 %. The results of the study indicate the need to enhance the recovery ratio for improved performance.
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