SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 324-334.DOI: 10.1016/j.cjche.2020.10.014

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

Xuke Ruan, Xiao-Sen Li   

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
  • Received:2019-11-25 Revised:2020-10-13 Online:2021-06-19 Published:2021-04-28
  • Contact: Xiao-Sen Li
  • Supported by:
    This work is supported by Key Program of National Natural Science Foundation of China (Grant No. 51736009), Guangdong Special Support Program-Local innovation and entrepreneurship team project (2019BT02L278), Special project for marine economy development of Guangdong Province(GDME-2018D002), Science and Technology Apparatus Development Program of the Chinese Academy of Sciences (YZ201619), Frontier Sciences Key Research Program of the Chinese Academy of Sciences (QYZDJ-SSWJSC033, QYZDB-SSW-JSC028) and Program of CAS Key Laboratory of Gas Hydrate (y907jb1001), which are gratefully acknowledged.

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

Xuke Ruan, Xiao-Sen Li   

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
  • 通讯作者: Xiao-Sen Li
  • 基金资助:
    This work is supported by Key Program of National Natural Science Foundation of China (Grant No. 51736009), Guangdong Special Support Program-Local innovation and entrepreneurship team project (2019BT02L278), Special project for marine economy development of Guangdong Province(GDME-2018D002), Science and Technology Apparatus Development Program of the Chinese Academy of Sciences (YZ201619), Frontier Sciences Key Research Program of the Chinese Academy of Sciences (QYZDJ-SSWJSC033, QYZDB-SSW-JSC028) and Program of CAS Key Laboratory of Gas Hydrate (y907jb1001), which are gratefully acknowledged.

Abstract: The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate dissociation. In this study, the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous media. The experiments of methane hydrate depressurization-induced dissociation were performed in a 1D high pressure cell filled with glass beads, an improved and valid 1D core-scale numerical model was developed to simulate gas production. Two conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media, which formed the functional form of the hydrate dissociation surface area with porosity, hydrate saturation and the average radius of sand sediment particles. With the establishment of numerical model for depressurization-induced hydrate dissociation in porous media, the cumulative gas productions were modeling and compared with the experimental data at the different hydrate saturations. The results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area, and the grain-coating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation, whereas at higher hydrate saturation, the hydrate dissociation simulation from the pore-filling surface area model is more reasonable. Finally, the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

Key words: Surface area, Methane hydrate, Hydrate dissociation, Hydrate morphology, Depressurization

摘要: The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate dissociation. In this study, the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous media. The experiments of methane hydrate depressurization-induced dissociation were performed in a 1D high pressure cell filled with glass beads, an improved and valid 1D core-scale numerical model was developed to simulate gas production. Two conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media, which formed the functional form of the hydrate dissociation surface area with porosity, hydrate saturation and the average radius of sand sediment particles. With the establishment of numerical model for depressurization-induced hydrate dissociation in porous media, the cumulative gas productions were modeling and compared with the experimental data at the different hydrate saturations. The results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area, and the grain-coating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation, whereas at higher hydrate saturation, the hydrate dissociation simulation from the pore-filling surface area model is more reasonable. Finally, the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词: Surface area, Methane hydrate, Hydrate dissociation, Hydrate morphology, Depressurization