Energy optimization of a non-aqueous solvent CO2 absorption system with pressure swing regeneration.

• Energy optimization of CO 2 capture has been conducted using 2-(ethylamino) ethanol (EAE) and diethylene glycol monomethyl ether (DEGMME). • The regeneration process was based on pressure difference, using LNG cold energy as the driving force. • The total energy requirement for CO 2 capture was strongly related to the CO 2 concentration in the system. • The optimum condition could be reached with a 31 % energy reduction. This study focuses on optimizing the energy requirement in the post-combustion CO 2 capture system using pressure swing regeneration through a model-based design (MBD). The simulation results highlight the significant impact of CO 2 recovery, inlet gas and liquid flow rate, and CO 2 concentration in the flue gas on the overall energy demand of the system. Moreover, an investigation into the de-sublimation chamber was undertaken, revealing a relationship between dry ice formation and the heat transfer between the LNG stream and CO 2 in the heat exchanger. The parametric analysis study reveals that the sensible heat of the lean solvent is significantly influenced by the CO 2 concentration in the liquid, consequently affecting the overall system energy. According to the results, the utilization of cold energy from LNG could save 80 % of the total energy requirement. The optimization results found the best working condition, which consumes energy of 0.190 GJ/ton CO 2 , 31 % lower than the basic scenario. [ABSTRACT FROM AUTHOR]

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