A comprehensive model for regeneration process of CO2 capture using aqueous ammonia solution

Abstract

A comprehensive model, which simultaneously considered the hydrodynamics, non-ideal thermodynamic behaviors, rate-based heat/mass transfer, and finite reaction rates, was developed for simulating the regeneration process of the NH3 based CO2 capture. The kinetic reaction model is adopted for describing the chemical reactions in the condenser, packing section, and reboiler of the stripper. The predicted vapor partial pressures, liquid species concentrations, and regeneration process parameters by the comprehensive model agree well with the experimental results. The predictive abilities of the chemistry model and kinetic reaction model for the condenser and reboiler on the regeneration process were compared. The chemistry model for the condenser has little effects on the predictions of most parameters of the regeneration process, and it only significantly underestimates the NH3 volume concentration in the gas product. The chemistry model for the reboiler predicts lower CO2 output, higher reboiler heat duty, and thus higher regeneration energy.