Mechanism Modeling of Elevated Temperature Pressure Swing Adsorption Process for Pre-combustion CO2 Capture

摘要

The elevated temperature pressure swing adsorption (PSA) is a promising technology for pre-combustion CO2 capture in Integrated Gasification Combined Cycle (IGCC) power plant by taking the advantages of high partial pressure (1.0-2.0 MPa) of CO2 in the syngas after water-gas shift reaction. An elementary reaction kinetic model was developed to predict the CO2 adsorption capacity and adsorption kinetic behavior for potassium promoted hydrotalcite-like compound (K-promoted HTlcs). Thermo gravimetric analysis (TGA) and a high pressure adsorption apparatus were respectively used below atmospheric pressure and above atmospheric pressure. The results indicate that the modeling results agreed well the experimental results. The elevated temperature PSA system modeling firamework is developed by considering comprehensive coupling effects from mass, heat, and momentum transport mechanisms. The modeling framework is implemented in the gPROMS commercial simulation platform by integrating adsorption bed with dynamic boundary condition and realistic operating procedures. The presented modeling framework can be further apphed for the system optimization and controller design for multi-column elevated temperature PSA processes.