Reducing energy consumption of advanced PTSA CO2 capture process―Experimental and numerical study

• Advanced PTSA CO2 capture process by isosteric heat and waste pressure recovery was evaluated.
• The sorbent kinetics used for simulation was first experimentally tested.
• Sensitivity analysis of key parameters was conducted by PRO/II ver. 9.1, Invensys.
• The energy consumption of the proposed process was reduced to 1.18 MJ/kg CO2.

Climate change caused by the emission of greenhouse gases (GHGs), in particular carbon dioxide, has become a critical challenge. However, high energy penalty of CO2 capture processes is still a critical bottleneck that restricts its commercial application. In this study, an advanced pressure–temperature swing adsorption (PTSA) CO2 capture process by integrating chemical heat transformer and pressure recovery is investigated to reduce energy requirement. To evaluate the energy consumption of the proposed adsorption process, experimental and numerical study were both carried out. Initially, the adsorption kinetics (i.e. adsorption isotherm, breakthrough curve and isosteric heat) of the sorbent (zeolium®F9-HA) were tested using a fixed-bed setup. Based on the obtained experimental data, the energy consumption of the advanced PTSA process was evaluated by a commercial process-simulation software (PRO/II ver. 9.1, Invensys). The simulation results indicate that the energy consumption of the proposed PTSA process decreased to 1.18 MJ/kg CO2 (approximately 40% that of the conventional PTSA process).

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