Dynamic modeling of the solvent regeneration part of a CO2 capture plant

Abstract

In this work, a system of unit operations is modeled and implemented in MATLAB for dynamic simulation of the regeneration part of the CO2 capture process. The system consists of a stripper, a reboiler and a condenser, and it is solved by a simultaneous equation based method. The method proves to be suitable for solving the regeneration part of the CO2 capture process and it shows numerically stable behavior in general. Further, two dynamic simulation cases are carried out and compared to steady state simulation results from CO2SIM. The dynamic simulation results show reasonably good agreement with steady state simulations, even though a very simplified flash tank model is used for simulation of reboiler and condenser and a simplified thermodynamic model is applied compared to the more robust CO2SIM model. Due to lack of dynamic pilot data, validation of the dynamic regeneration model has been difficult at this point. However, this is necessary for a thorough validation of the model for transient conditions.