Biogas upgrading technologies: Energetic analysis and environmental impact assessment

doi:10.1016/j.cjche.2014.09.048

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (1): 247-254.DOI: 10.1016/j.cjche.2014.09.048

• 能源、资源与环境技术 • 上一篇下一篇

Biogas upgrading technologies: Energetic analysis and environmental impact assessment

Yajing Xu^1,2, Ying Huang^1,2, Bin Wu^1,2, Xiangping Zhang¹, Suojiang Zhang¹

1 Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2014-02-18 修回日期:2014-06-24 出版日期:2015-01-28 发布日期:2015-01-24
通讯作者: Xiangping Zhang, Suojiang Zhang
基金资助:
Supported by the National Basic Research Program of China (2013CB733506, 2014CB744306) and the National Natural Science Foundation of China (21036007, 51274183).

Biogas upgrading technologies: Energetic analysis and environmental impact assessment

Yajing Xu^1,2, Ying Huang^1,2, Bin Wu^1,2, Xiangping Zhang¹, Suojiang Zhang¹

1 Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-02-18 Revised:2014-06-24 Online:2015-01-28 Published:2015-01-24
Contact: Xiangping Zhang, Suojiang Zhang
Supported by:
Supported by the National Basic Research Program of China (2013CB733506, 2014CB744306) and the National Natural Science Foundation of China (21036007, 51274183).

摘要/Abstract

摘要： Biogas upgrading for removing CO₂ and other trace components from raw biogas is a necessary step before the biogas to be used as a vehicle fuel or supplied to the natural gas grid. In this work, three technologies for biogas upgrading, i.e., pressuredwater scrubbing (PWS), monoethanolamine aqueous scrubbing (MAS) and ionic liquid scrubbing (ILS), are studied and assessed in terms of their energy consumption and environmental impactswith the process simulation and green degree method. A non-random-two-liquid and Henry's law property method for a CO₂ separation system with ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf₂N]) is established and verified with experimental data. The assessment results indicate that the specific energy consumption of ILS and PWS is almost the same and much less than that of MAS. High purity CO₂ product can be obtained by MAS and ILS methods, whereas no pure CO₂ is recovered with the PWS. For the environmental aspect, ILS has the highest green degree production value, while MAS and PWS produce serious environmental impacts.

关键词: Biogas upgrading, Monoethanolamine aqueous scrubbing, Pressured water scrubbing, Ionic liquid, Green degree

Abstract: Biogas upgrading for removing CO₂ and other trace components from raw biogas is a necessary step before the biogas to be used as a vehicle fuel or supplied to the natural gas grid. In this work, three technologies for biogas upgrading, i.e., pressuredwater scrubbing (PWS), monoethanolamine aqueous scrubbing (MAS) and ionic liquid scrubbing (ILS), are studied and assessed in terms of their energy consumption and environmental impactswith the process simulation and green degree method. A non-random-two-liquid and Henry's law property method for a CO₂ separation system with ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf₂N]) is established and verified with experimental data. The assessment results indicate that the specific energy consumption of ILS and PWS is almost the same and much less than that of MAS. High purity CO₂ product can be obtained by MAS and ILS methods, whereas no pure CO₂ is recovered with the PWS. For the environmental aspect, ILS has the highest green degree production value, while MAS and PWS produce serious environmental impacts.

Key words: Biogas upgrading, Monoethanolamine aqueous scrubbing, Pressured water scrubbing, Ionic liquid, Green degree

Yajing Xu, Ying Huang, Bin Wu, Xiangping Zhang, Suojiang Zhang. Biogas upgrading technologies: Energetic analysis and environmental impact assessment[J]. Chinese Journal of Chemical Engineering, 2015, 23(1): 247-254.

Yajing Xu, Ying Huang, Bin Wu, Xiangping Zhang, Suojiang Zhang. Biogas upgrading technologies: Energetic analysis and environmental impact assessment[J]. Chin.J.Chem.Eng., 2015, 23(1): 247-254.

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Biogas upgrading technologies: Energetic analysis and environmental impact assessment

Biogas upgrading technologies: Energetic analysis and environmental impact assessment

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