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

Area of Science:

• Chemical Engineering
• Environmental Science
• Atmospheric Chemistry

Background:

• Aerosol emissions from CO2 capture processes contribute to solvent loss and environmental pollution.
• Effective mitigation strategies are crucial for sustainable carbon capture technologies.

Purpose of the Study:

• To develop and evaluate a novel multi-stage circulation approach for synergistic aerosol reduction during CO2 capture.
• To minimize solvent loss and environmental impact associated with aerosol emissions.

Main Methods:

• Implementing a three-stage circulation system in the absorption section.
• Decoupling the operation of absorption sections, managing liquid-gas ratio and solvent temperature.
• Incorporating a water wash section for post-absorption aerosol removal.

Main Results:

• Aerosol mass concentration reduced by 25.6% in the 3rd absorption section, reaching 349.7 mg/m3.
• Further reduction to 168.6 mg/m3 achieved with optimized water wash parameters.
• Demonstrated effectiveness of decoupled operation and water washing in aerosol mitigation.

Conclusions:

• The multi-stage circulation system with decoupled operation and water washing effectively reduces aerosol emissions from CO2 capture.
• This approach offers significant potential for mitigating global warming and controlling environmental pollution.
• Proposed improvements include solvent recovery utilization and SO2 co-removal.