An Improved CO 2 Separation and Purification System Based on Cryogenic Separation and Distillation Theory

Gang Xu, Feifei Liang, Yongping Yang, Yue Hu, Kai Zhang and Wenyi Liu
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Gang Xu: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Feifei Liang: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Yongping Yang: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Yue Hu: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Kai Zhang: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
Wenyi Liu: Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, School of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Energies, 2014, vol. 7, issue 5, 1-19

Abstract: In this study, an improved CO 2 separation and purification system is proposed based on in-depth analyses of cryogenic separation and distillation theory as well as the phase transition characteristics of gas mixtures containing CO 2 . Multi-stage compression, refrigeration, and separation are adopted to separate the majority of the CO 2 from the gas mixture with relatively low energy penalty and high purity. Subsequently, the separated crude liquid CO 2 is distilled under high pressure and near ambient temperature conditions so that low energy penalty purification is achieved. Simulation results indicate that the specific energy consumption for CO 2 capture is only 0.425 MJ/kgCO 2 with 99.9% CO 2 purity for the product. Techno-economic analysis shows that the total plant investment is relatively low. Given its technical maturity and great potential in large-scale production, compared to conventional MEA and Selexol TM absorption methods, the cost of CO 2 capture of the proposed system is reduced by 57.2% and 45.9%, respectively. The result of this study can serve as a novel approach to recovering CO 2 from high CO 2 concentration gas mixtures.

Keywords: CO 2 recovery; cryogenic separation; conventional distillation; techno-economic analysis; oxy-fuel combustion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (21)

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