Enhancing CO2 capture efficiency in a lab-scale spray tower: An experimental study on flow configurations using potassium carbonate
Ali Najarnezhadmashhadi, Noé Das Neves, Kimberly Yorllet Toala Escobar, Carl Häggmark, Dan Karlsson, Peter Franzén, Christophe Duwig, Henrik Kušar
Abstract
Spray towers have proven to be efficient in capturing gases and vapours, finding widespread use across various applications including CO 2 capture. As there is scarce reference material regarding spray tower performances with different flow configurations other than the conventional counter-current flow, as well as the use of substitute solvents to MEA, there is a need to study different configurations and setup designs, including different placements of gas and liquid inlets in the absorber tower, to find the optimal configuration. In this study, the capture of CO 2 from a CO 2 /N 2 mixture using unpromoted potassium carbonate as the absorbent in a lab-scale spray tower was experimentally measured in four different flow configurations over a wide range of operating conditions, including gas and liquid flow rates, CO 2 concentration, K 2 CO 3 concentration and solvent temperature. Among four different configurations, the two sides co-current configuration, with gas nozzles positioned on opposite sides of the column and liquid coming from above, was found to be the most effective setup for enhancing CO 2 capture efficiency by promoting better mixing and contact between gas and liquid. • CO₂ Absorption in Spray Towers: CO₂ absorption efficiency was assessed for different flow configurations. • Novel Flow Configurations: The two-sides spray method improved gas-liquid contact compared to middle spray. • Key Parameter Effects: Analyzed the impact of gas flow rate, CO₂ and K₂CO₃ concentrations, temperature, and liquid volume on absorption efficiency. • Industrial Potential: The Two-sides co-current configuration promising for industrial scale-up use. • Absorption Efficiency Considerations: K₂CO₃ may require promoters or be replaced with faster-reacting chemicals (MEA, ammonia).