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Post-combustion CO2 capture with ammonia by vortex flow-based multistage spraying: Process intensification and performance characteristics

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  • Zhao, Bingtao
  • Su, Yaxin
  • Cui, Guomin

Abstract

To improve the process and performance of CO2 capture with ammonia by chemical absorption, a vortex flow-based multistage spray reactor was designed to evaluate the enhancement effect for post-combustion CO2 capture with ammonia. The process intensification analysis based on flow patterns from a CFD (computational fluid dynamics) simulation indicated that the vortex flow presented multi-dimensional velocities including a V-shaped tangential velocity profile and non-uniform axial velocity profile, which resulted in enhancement of gas–liquid contact, mixing, mass transfer, and reaction compared to non-vortex flow. Furthermore, the CO2 capture characteristics were examined at varied operating parameters. It was found that the capture efficiency E increased with increasing ammonia concentration and liquid flow rate but decreased with increasing CO2 inlet concentration and gas flow rate. Meanwhile, the overall gas phase mass transfer coefficient Kga increased with increasing ammonia concentration, liquid flow rate, and gas flow rates but decreased with increasing CO2 inlet concentration. Within the measured range, the E and Kga varied from 72.05 to 86.72% and 0.31–0.49 × 10−3 kmol/m3 kPa s, respectively. Importantly, vortex flow presents relative enhancements of 7–15% in E and 18–33% in Kga compared with non-vortex flow depending on the operating parameters.

Suggested Citation

  • Zhao, Bingtao & Su, Yaxin & Cui, Guomin, 2016. "Post-combustion CO2 capture with ammonia by vortex flow-based multistage spraying: Process intensification and performance characteristics," Energy, Elsevier, vol. 102(C), pages 106-117.
    • Handle: RePEc:eee:energy:v:102:y:2016:i:c:p:106-117
    DOI: 10.1016/j.energy.2016.02.056
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    References listed on IDEAS

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    1. Olajire, Abass A., 2010. "CO2 capture and separation technologies for end-of-pipe applications – A review," Energy, Elsevier, vol. 35(6), pages 2610-2628.
    2. Zhao, Bingtao & Su, Yaxin & Tao, Wenwen, 2014. "Mass transfer performance of CO2 capture in rotating packed bed: Dimensionless modeling and intelligent prediction," Applied Energy, Elsevier, vol. 136(C), pages 132-142.
    3. Pellegrini, G. & Strube, R. & Manfrida, G., 2010. "Comparative study of chemical absorbents in postcombustion CO2 capture," Energy, Elsevier, vol. 35(2), pages 851-857.
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    Cited by:

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    2. Yanchi Jiang & Zhongxiao Zhang & Haojie Fan & Junjie Fan & Haiquan An, 2018. "Experimental study on hybrid MS†CA system for post†combustion CO2 capture," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(2), pages 379-392, April.
    3. Xu, Yin & Jin, Baosheng & Zhao, Yongling & Hu, Eric J. & Chen, Xiaole & Li, Xiaochuan, 2018. "Numerical simulation of aqueous ammonia-based CO2 absorption in a sprayer tower: An integrated model combining gas-liquid hydrodynamics and chemistry," Applied Energy, Elsevier, vol. 211(C), pages 318-333.
    4. Li, Jun & Huang, Hongyu & Kobayashi, Noriyuki & Wang, Chenguang & Yuan, Haoran, 2017. "Numerical study on laminar burning velocity and ignition delay time of ammonia flame with hydrogen addition," Energy, Elsevier, vol. 126(C), pages 796-809.
    5. Zhao, Bingtao & Tao, Wenwen & Zhong, Mei & Su, Yaxin & Cui, Guomin, 2016. "Process, performance and modeling of CO2 capture by chemical absorption using high gravity: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 44-56.

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