Aerosol-driven solvent losses have been identified as one of the major challenges of amine-based post-combustion CO2 capture. In this work, a multi-component aerosol dynamics model based on the discrete-sectional approach, accounting for condensation and coagulation was coupled with a process simulation model developed using ASPEN PLUS v10® to account for the multi-component mass and heat transfer, hydrodynamics, thermodynamics, and electrolytic-solution chemistry. Particle losses inside the absorber were incorporated into the model based on a cut-off size determined from experiments reported in the literature. Based on the results, it was shown that neglecting particle losses inside the absorber resulted in a significant over-prediction of amine-based solvent losses, while coagulation of particles resulted in reduced (∼10%) amine emissions. Furthermore, amine emissions increased when the number concentration and the geometric standard deviation of inlet particles in the flue gas were increased. Moreover, it was shown that amine emissions were lower at lower solvent concentrations and temperatures. CO2 capture efficiency dropped for decreasing solvent concentration, but remained unchanged for lower temperatures, suggesting that decreasing the solvent temperature is an efficient strategy to reduce amine emissions.
- Aerosol dynamics
- Amine losses
- Post combustion CO capture
- Process simulation
ASJC Scopus subject areas
- Industrial and Manufacturing Engineering
- Management, Monitoring, Policy and Law