Comparative techno-economic analysis and optimization of CO2 liquefaction processes using Bayesian optimization

This study presents a comprehensive techno-economic and exergy efficiency analysis of CO2 liquefaction processes, integrating diverse structural configurations with an advanced black-box optimization. Unlike previous works limited to fixed process topologies, this research proposes a unified optimization framework that systematically explores open-loop, closed-loop, and open/closed-loop systems. By employing an automated Aspen Plus-Bayesian optimization interface, we simultaneously optimize the number of compression stages and operating parameters, overcoming the limitations of conventional trial-and-error approaches.The study evaluates performance across different product pressures (7.5 bar and 20 bar) and production capacities (1000, 2000, and 3000 TPD). Our analysis identified the open-loop system as cost-optimal for the 7.5 bar product, achieving levelized costs of $14.03-$12.63/tCO2…