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Analysis of a New Liquefaction Combined with Desublimation System for CO 2 Separation Based on N 2 /CO 2 Phase Equilibrium

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  • Wenchao Yang

    (School of Energy and Environment, Southeast University, No 2 Si Pai Lou, Nanjing 210096, Jiangsu, China)

  • Shuhong Li

    (School of Energy and Environment, Southeast University, No 2 Si Pai Lou, Nanjing 210096, Jiangsu, China)

  • Xianliang Li

    (9M Architectural Design Co. Ltd., No 2 Zi Jing Hua Road, Hangzhou 310012, Zhejiang, China)

  • Yuanyuan Liang

    (School of Energy and Environment, Southeast University, No 2 Si Pai Lou, Nanjing 210096, Jiangsu, China)

  • Xiaosong Zhang

    (School of Energy and Environment, Southeast University, No 2 Si Pai Lou, Nanjing 210096, Jiangsu, China)

Abstract

Cryogenic CO 2 capture is considered as a promising CO 2 capture method due to its energy saving and environmental friendliness. The phase equilibrium analysis of CO 2 -mixtures at low temperature is crucial for the design and operation of a cryogenic system because it plays an important role in analysis of recovery and purity of the captured CO 2 . After removal of water and toxic gas, the main components in typical boiler gases are N 2 /CO 2 . Therefore, this paper evaluates the reliabilities of different cubic equations of state (EOS) and mixing rules for N 2 /CO 2 . The results show that Peng-Robinson (PR) and Soave-Redlich-Kwong (SRK) fit the experimental data well, PR combined with the van der Waals (vdW) mixing rule is more accurate than the other models. With temperature decrease, the accuracy of the model improves and the deviation of the N 2 vapor fraction is 0.43% at 220 K. Based on the selected calculation model, the thermodynamic properties of N 2 /CO 2 at low temperature are analyzed. According to the results, a new liquefaction combined with a desublimation system is proposed. The total recovery and purity of CO 2 production of the new system are satisfactory enough for engineering applications. Additionally, the total energy required by the new system to capture the CO 2 is about 3.108 MJ·kg −1 CO 2 , which appears to be at least 9% lower than desublimation separation when the initial concentration of CO 2 is 40%.

Suggested Citation

  • Wenchao Yang & Shuhong Li & Xianliang Li & Yuanyuan Liang & Xiaosong Zhang, 2015. "Analysis of a New Liquefaction Combined with Desublimation System for CO 2 Separation Based on N 2 /CO 2 Phase Equilibrium," Energies, MDPI, vol. 8(9), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:9:p:9495-9508:d:55116
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    References listed on IDEAS

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    1. Li, Hailong & Jakobsen, Jana P. & Wilhelmsen, Øivind & Yan, Jinyue, 2011. "PVTxy properties of CO2 mixtures relevant for CO2 capture, transport and storage: Review of available experimental data and theoretical models," Applied Energy, Elsevier, vol. 88(11), pages 3567-3579.
    2. Li, H. & Yan, J., 2009. "Impacts of equations of state (EOS) and impurities on the volume calculation of CO2 mixtures in the applications of CO2 capture and storage (CCS) processes," Applied Energy, Elsevier, vol. 86(12), pages 2760-2770, December.
    3. Theunissen, Ton & Golombok, Mike & Brouwers, J.J.H. (Bert) & Bansal, Gagan & van Benthum, Rob, 2011. "Liquid CO2 droplet extraction from gases," Energy, Elsevier, vol. 36(5), pages 2961-2967.
    4. Li, H. & Yan, J., 2009. "Evaluating cubic equations of state for calculation of vapor-liquid equilibrium of CO2 and CO2-mixtures for CO2 capture and storage processes," Applied Energy, Elsevier, vol. 86(6), pages 826-836, June.
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