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

Wenchao Yang, Shuhong Li, Xianliang Li, Yuanyuan Liang and Xiaosong Zhang
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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

Energies, 2015, vol. 8, issue 9, 1-14

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%.

Keywords: cryogenic CO 2 capture; phase equilibrium; equations of state (EOS); mixing rules; energy consumption (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: 2015
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