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Methane recovery from coal mine gas using hydrate formation in water-in-oil emulsions

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  • Zhong, Dong-Liang
  • Ding, Kun
  • Lu, Yi-Yu
  • Yan, Jin
  • Zhao, Wei-Long

Abstract

In this work, a water-in-oil (W/O) emulsion was developed using liquid water, mineral oil, Sorbitan monooleate (Span 80), and cyclopentane. It was employed to enhance gas hydrate formation for CH4 separation from a simulated coal mine methane (CMM) gas (30mol% CH4, 60mol%N2, and 10mol% O2). The stability test at atmospheric pressure and at a high pressure of 3.5MPa showed that stable W/O emulsions were obtained when the water–oil volume ratio (WOR) was below 80%. The emulsified droplets size was measured with WOR ranging from 10% to 70%. Then kinetic experiments of CH4 separation by hydrate formation in W/O emulsions were carried out at 273.6K and (3.5–5.0)MPa in batch operation. The results indicated that water–oil volume ratio is a key factor that affects the kinetics of gas hydrate formation from the CMM gas mixture. Hydrate nucleation was observed to occur faster while WOR was decreased, and gas uptake increased significantly with the decrease of WOR. CH4 concentration in the recovered gas mixture was increased to 52mol% as compared to 30mol% in the original gas mixture through one-stage hydrate formation in the W/O emulsions. It was found that the experimental conditions of 273.6K, 3.5MPa and WOR=30% were favorable for CH4 recovery from the CMM gas. The CH4 recovery obtained under these conditions was 43%. It was higher than those obtained at WOR=10% and 70%, and was greatly increased as compared with those obtained in the same reactor with the presence of TBAB (26%) and CP (33%).

Suggested Citation

  • Zhong, Dong-Liang & Ding, Kun & Lu, Yi-Yu & Yan, Jin & Zhao, Wei-Long, 2016. "Methane recovery from coal mine gas using hydrate formation in water-in-oil emulsions," Applied Energy, Elsevier, vol. 162(C), pages 1619-1626.
    • Handle: RePEc:eee:appene:v:162:y:2016:i:c:p:1619-1626
    DOI: 10.1016/j.apenergy.2014.11.010
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    Cited by:

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    8. Mu, Liang & Zhou, Ziqi & Zhao, Huixing & Zhu, Xiaohai & Cui, Qingyan, 2024. "High-efficiency recovery of methane from coal bed gas via hydrate formation in emulsions," Energy, Elsevier, vol. 290(C).
    9. Liu, Jun & Ding, Jia-Xiang & Liang, De-Qing, 2018. "Experimental study on hydrate-based gas separation of mixed CH4/CO2 using unstable ice in a silica gel bed," Energy, Elsevier, vol. 157(C), pages 54-64.
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    11. Wang, Fei & Fu, Shanfei & Guo, Gang & Jia, Zhen-Zhen & Luo, Sheng-Jun & Guo, Rong-Bo, 2016. "Experimental study on hydrate-based CO2 removal from CH4/CO2 mixture," Energy, Elsevier, vol. 104(C), pages 76-84.
    12. Wang, Yiwei & Du, Mei & Guo, Xuqiang & Sun, Qiang & Liu, Aixian & Chen, Bo & Chen, Guangjin & Sun, Changyu & Yang, Lanying, 2017. "Experiments and simulations for continuous recovery of methane from coal seam gas (CSG) utilizing hydrate formation," Energy, Elsevier, vol. 129(C), pages 28-41.
    13. Cai, Jing & Xu, Chun-Gang & Xia, Zhi-Ming & Chen, Zhao-Yang & Li, Xiao-Sen, 2017. "Hydrate-based methane separation from coal mine methane gas mixture by bubbling using the scale-up equipment," Applied Energy, Elsevier, vol. 204(C), pages 1526-1534.
    14. Ouyang, Qian & Zheng, Junjie & Pandey, Jyoti Shanker & von Solms, Nicolas & Linga, Praveen, 2024. "Coupling amino acid injection and slow depressurization with hydrate swapping exploitation: An effective strategy to enhance in-situ CO2 storage in hydrate-bearing sediment," Applied Energy, Elsevier, vol. 366(C).
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    16. Thakre, Niraj & Jana, Amiya K., 2017. "Modeling phase equilibrium with a modified Wong-Sandler mixing rule for natural gas hydrates: Experimental validation," Applied Energy, Elsevier, vol. 205(C), pages 749-760.

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