Parametric study and optimisation of hot K₂CO₃‐based post‐combustion CO₂ capture from a coal‐fired power plant

Abstract

Detailed parametric analyses on a post‐combustion carbon dioxide (CO2) capture system using a hot potassium carbonate solution was completed using a rate‐based simulation study. The system was simulated in Aspen Plus® V10, adopting the electrolyte non‐random two‐liquid property package. A base case study of the system was validated using literature data. Parametric analyses were then performed to study the effect of vital system parameters on CO2 capture rate and stripper reboiler duty. These system parameters include: (i) reflux ratio of stripping column (ii) lean solvent flowrate (iii) flue gas flowrate (iv) lean solvent concentration (v) lean solvent temperature (vi) flue gas temperature and (vii) absorber operating pressure. Changes in the lean solvent concentration (from 25 to 45 wt%) and absorber operating pressure (from 0.5 to 2.5 MPa) were observed to have the most significant effects on the overall performance of the capture system. Increasing both parameters showed substantial declines in the reboiler duty and resulted in remarkable increases in the corresponding carbon capture levels, and vice versa. The performance of various packing types in the absorber and stripper columns were also studied. Among the packing types examined, Flexipac Koch Metal 1Y was observed to yield the best system performance. The results from the parametric analyses were used to propose an optimised model that was able to improve carbon removal rate by 12.61% and decreased stripper reboiler duty by 14.86%. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

Improved Prediction of Reaction Kinetics for Amine Absorbent-based Carbon Capture using Reactive Site-based Transition State Conformer Search Method

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Insights into the synergistic effects of metal particles (Ag, Cu, and Fe) and urea on CO2 clathrate hydrate growth using molecular dynamics simulations

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Simulation and Performance Comparison for CO2 Capture by Aqueous Solvents of N-(2-Hydroxyethyl) Piperazine and Another Five Single Amines

“…minimizing the solvent regeneration energy. Ayittey et al [20] carried out detailed parametric analyses on a post-combustion CO 2 capture system using a hot potassium carbonate solution using a rate-based simulation study. The effect of system parameters on CO 2 capture rate and stripper reboiler duty were studied: reflux ratio of stripping column, lean solvent flowrate, flue gas flowrate, lean solvent concentration, lean solvent temperature, flue gas temperature and absorber operating pressure.…”