Optimization of CO₂ Capture Efficiency Using a Spray Tower and CFD Simulations This study aims to evaluate and optimize CO₂ capture efficiency using a spray tower with Sodium Hydroxide (NaOH) as the absorbent under varying operational conditions. Computational Fluid Dynamics (CFD) simulations will be conducted using STAR-CCM+ to enhance CO₂ absorption by adjusting key parameters, including the number of nozzles, solvent flow rates, flue gas flow rates (up to 200 m³/h), and NaOH concentrations (up to 15 wt%). The computational model will be validated against experimental data obtained from the Tekniska Verken waste-to-energy power plant in Linköping. The insights gained from these simulations will support the optimization and scaling of spray tower configurations, improving CO₂ capture efficiency for industrial applications. This work contributes to the broader goal of reducing greenhouse gas emissions by enhancing the economic viability and scalability of CO₂ capture technologies. For computational resources, we successfully run our first simulations on the Dardel PDC supercomputer, where everything functions well. However, we encountered technical difficulties running STAR-CCM+ on Tetralith (Linköping’s supercomputer) due to licensing and version compatibility issues. We use the Euler-Lagrange approach to model the injection of liquid solvent into the chamber, considering different chamber lengths and multiple injectors at various injection levels. The initial results indicate that simulations need to run for 30 to 50 seconds, depending on the liquid-gas flux. To achieve accurate resolution, the mesh size will range between 5 to 15 million cells, depending on the specific case. Given the computational intensity of these simulations, access to high-performance computing resources is essential to ensure efficient and reliable results. Given the computational demands of this project, I kindly request access to the Dardel supercomputer to continue our simulations efficiently. This access is crucial for advancing our research on CO₂ capture and optimizing industrial-scale carbon capture technologies.