Insights into a membrane contactor based demonstration unit for CO2 capture
Nieminen, Harri; Järvinen, Lauri; Ruuskanen, Vesa; Laari, Arto; Koiranen, Tuomas; Ahola, Jero (2019-08-16)
Post-print / Final draft
Separation and Purification Technology
School of Engineering Science
In preliminary tests, the results of which are described herein, a 3M Liqui-Cel™ polypropylene hollow-fiber membrane module and a glass vacuum chamber were used for absorption and desorption, respectively, along with a potassium glycinate amino acid salt absorbent solution. This solution has high surface tension and is fully compatible with the polypropylene membrane unit used. In preliminary tests, the highest observed CO2 flux was 0.82 mol m-2 h-1, with a CO2 product purity of above 80%. The calculated overall mass transfer coefficient was comparable to reference systems. The performance of the unit in its current setup was found to be limited by the desorption efficiency. Due to the low desorption rates, the measured specific energy consumption was exceedingly high, at 4.6 MJ/mol CO2 (29.0 MWh/t) and 0.8 MJ/mol CO2 (5.0 MWh/t) of heat and electricity, respectively. Higher desorption temperatures and lower vacuum pressures enhanced the desorption efficiency and reduced the specific energy consumption. The energy efficiency could be improved via several methods in the future, e.g., by applying ultrasound radiation or by replacing the current vacuum chamber stripping unit with a membrane module or some other type of desorption unit.
Nieminen, H., Järvinen, L., Ruuskanen, V., Laari, A., Koiranen, T., Ahola, J. (2019). Insights into a membrane contactor based demonstration unit for CO2 capture. Separation and Purification Technology, vol. 231. DOI: 10.1016/j.seppur.2019.115951
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