Abstract
In this paper, an equilibrium-based simulation method for CO2 capture using aqueous ammonia was investigated. Quantitative comparisons of the equilibrium- and rate-based methods were performed. Effects of the stage number on the equilibrium- and rate-based simulations were obtained. Analysis on regeneration energy of NH3-based CO2 capture with the equilibrium-based simulation method was carried out. As the stage number for the equilibrium-based simulations increases, the regeneration energy decreases gradually to a constant value. For the equilibrium-based simulations of the NH3-based CO2 regeneration process, with the increase of the reboiler heat duty, the regeneration energy decreases to a minimum value firstly, and then begins to increase. In addition, effects of the temperature, NH3 concentration and CO2 loading of the rich solvent flowing into the stripper on the regeneration energy were obtained using the equilibrium-based simulation method.
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