Reaction sensitivity analysis of regeneration process of CO2 capture using aqueous ammonia

• Reaction sensitivity analysis of CO2 regeneration process was performed.
• Reaction sensitivities were obtained at different operating conditions.
• The formation and decomposition of HCO3− significantly affect CO2 output.
• The formation and decomposition of NH2COO− significantly affect NH3 slip.
• A novel concept for reducing regeneration energy was proposed.

In order to improve the regeneration efficiency of CO2 capture using aqueous ammonia, it is important to recognize the characteristics of the kinetic reactions in the regeneration process. At first, the reaction sensitivity analysis method was determined to identify which kinetic reactions playing important roles in the regeneration process. Then, the reaction sensitivity analysis of this process was performed at different operating conditions of the rich solvent flowing into the stripper. The formation and decomposition reactions of bicarbonate both play important roles on the CO2 output, and the sensitivity of the CO2 output to the decomposition reaction of bicarbonate is mostly a bit larger than that to the formation reaction of bicarbonate. Based on the results of the reaction sensitivity analysis, a novel concept that is changing the reaction rates of the kinetic reactions that play important roles in the CO2 capture process was proposed for reducing the regeneration energy. For the tested process, this novel concept can reduce the regeneration energy by 30.31%.

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