1. Numerical study on carbon dioxide removal from the hydrogen-rich stream by supersonic Laval nozzle.
- Author
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Han, Chenyu, Jiang, Wenming, Liu, Yang, Dou, Zhuoying, and Jin, Bingxu
- Subjects
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CARBON sequestration , *CARBON dioxide , *NOZZLES , *SINGLE-phase flow , *WATER temperature , *STREAMFLOW - Abstract
A hydrogen purification system with a supersonic nozzle pretreatment process is proposed to improve the performance of traditional CO 2 removal processes from hydrogen-rich streams. A mathematical model of the H 2 –CO 2 double-component condensation was established to investigate the feasibility of CO 2 capture in a hydrogen-rich stream using a supersonic nozzle. Compared to the single-phase model, this model is more similar to the objective flow facts and can effectively correct the deviation of the single-phase flow model by 21.4%. Furthermore, the parameters in the H 2 –CO 2 double-components spontaneous condensation process in the nozzle were analyzed, and the microscopic mechanism of CO 2 spontaneous condensation was clarified. Finally, the effects of the inlet parameters on the carbon capture efficiency were analyzed. The results indicated that the nozzle is more suitable for purifying hydrogen-rich streams with low temperatures and high carbon content, confirming the possibility of using a supersonic nozzle as a carbon capture method. • Propose a novel CO 2 removal process in H 2 -rich streams by a supersonic Laval nozzle. • Develop a nonequilibrium condensation numerical model of CO 2 in H 2 -rich streams. • H 2 –CO 2 condensation flow model effectively corrects H 2 -rich stream flow behavior. • The H 2 -rich stream with high carbon content and low temperature is purified better. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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