Reducing Aerosol Emissions by Decoupled Parameter Management during the CO₂ Capture Process in a Multi-stage Circulation Absorber

Abstract

Aerosol emissions from the CO 2 capture process have a significant impact in terms of solvent loss and environmental pollution. Here, we propose a novel approach with multi-stage circulation for CO 2 capture and synergistic aerosol reduction, which divides the absorption section into three circulation stages and reduces aerosol emissions through decoupled operation of the three absorption sections and the management of solvent CO 2 loadings. Experimental results show that with the decoupled management of the liquid−gas ratio and solvent temperature in absorption sections, the aerosol mass concentration at the outlet of the 3rd absorption section can be reduced by 25.6% to a minimum of 349.7 mg/ m 3 at a liquid−gas ratio of 43.2 L/m 3 and a solvent temperature of 303 K. Furthermore, aerosol removal is performed by setting up a water wash section after the absorption section. The aerosol mass concentration at the outlet of the absorber is reduced to 168.6 mg/m 3 with the regulation of the wash water temperature and flow rate. In addition, improvements are proposed for the combination of the utilization of recovered solvents and the co-removal of SO 2 . This study provides innovative insights into the design of the CO 2 capture system and the reduction of aerosol emissions, which are of great significance for the mitigation of global warming and the control of environmental pollution.

Multistage Circulation Absorption Improvement: Simulation and Energy-Saving Evaluation of an Innovative Amine-Based CO2 Capture Process

“…In our previous work, we have used a small-scale MSC experimental platform to investigate and evaluate the absorption performance and regeneration duty of the MSC process . Simultaneously, the MSC process was modeled and studied by using Aspen Plus.…”

“…In our previous work, 43 we have used a small-scale MSC experimental platform to investigate and evaluate the absorption performance and regeneration duty of the MSC process. 44 Simultaneously, the MSC process was modeled and studied by using Aspen Plus. As shown in Figure 3, the simulation results were all within the error bars of the experimental data, confirming the reliability of the model.…”

Insights into Aerosol Emission Control in the Postcombustion CO2 Capture Process: From Cluster Formation to Aerosol Growth

“…The size of aerosols depends on their formation and growth processes within the absorber column . In addition to condensation nuclei, these processes are influenced by other factors, such as gas components and solvent temperature.…”