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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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    1. Zhang, Qiang & Zheng, Junjie & Zhang, Baoyong & Linga, Praveen, 2021. "Coal mine gas separation of methane via clathrate hydrate process aided by tetrahydrofuran and amino acids," Applied Energy, Elsevier, vol. 287(C).
    2. Zhong, Dong-Liang & Wang, Wen-Chun & Zou, Zhen-Lin & Lu, Yi-Yu & Yan, Jin & Ding, Kun, 2018. "Investigation on methane recovery from low-concentration coal mine gas by tetra-n-butyl ammonium chloride semiclathrate hydrate formation," Applied Energy, Elsevier, vol. 227(C), pages 686-693.
    3. Cai, Jing & Zhang, Yu & Xu, Chun-Gang & Xia, Zhi-Ming & Chen, Zhao-Yang & Li, Xiao-Sen, 2018. "Raman spectroscopic studies on carbon dioxide separation from fuel gas via clathrate hydrate in the presence of tetrahydrofuran," Applied Energy, Elsevier, vol. 214(C), pages 92-102.
    4. Wang, Xiao & Pan, Lin & Lau, Hon Chung & Zhang, Ming & Li, Longlong & Zhou, Qiao, 2018. "Reservoir volume of gas hydrate stability zones in permafrost regions of China," Applied Energy, Elsevier, vol. 225(C), pages 486-500.
    5. Yan Li & Alberto Maria Gambelli & Federico Rossi, 2022. "Experimental Study on the Effect of SDS and Micron Copper Particles Mixture on Carbon Dioxide Hydrates Formation," Energies, MDPI, vol. 15(18), pages 1-16, September.
    6. Wang, Yiwei & Deng, Ye & Guo, Xuqiang & Sun, Qiang & Liu, Aixian & Zhang, Guangqing & Yue, Gang & Yang, Lanying, 2018. "Experimental and modeling investigation on separation of methane from coal seam gas (CSG) using hydrate formation," Energy, Elsevier, vol. 150(C), pages 377-395.
    7. 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.
    8. Zhang, Qiang & Zheng, Junjie & Zhang, Baoyong & Linga, Praveen, 2023. "Kinetic evaluation of hydrate-based coalbed methane recovery process promoted by structure II thermodynamic promoters and amino acids," Energy, Elsevier, vol. 274(C).
    9. 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.
    10. 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.
    11. 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.
    12. Yan, Jin & Lu, Yi-Yu & Zhong, Dong-Liang & Zou, Zhen-Lin & Li, Jian-Bo, 2019. "Enhanced methane recovery from low-concentration coalbed methane by gas hydrate formation in graphite nanofluids," Energy, Elsevier, vol. 180(C), pages 728-736.
    13. 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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