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Exploitation of methane in the hydrate by use of carbon dioxide in the presence of sodium chloride
  • 时间:0
  • 分类:TE357[石油与天然气工程—油气田开发工程]
  • 作者机构:China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
  • 相关基金:support received from the National Natural Science Foundation of China (20476058,20676146);Ministry of Science and Technology of China (2006AA09A208,2009CB219504);Specialized Research Fund for the Doctoral Program of Higher Education (20070425001)
  • 相关项目:天然气水合物传质传热性能及稳定性研究
中文摘要:

The replacement process of CH4 from CH4 hydrate formed in NaCl solution by using pressurized CO2 was investigated with a self-designed device at temperatures of 271.05,273.15 and 275.05 K and a constant pressure of 3.30 MPa.The mass fraction of the NaCl solution was either 0.5 wt% or 1.0 wt%.The effects of temperature and concentration of NaCl solution on the replacement process were investigated.Experimental results showed that high temperature was favorable to the replacement reaction but high NaCl concentration had a negative effect on the replacement process.Based on the experimental data,kinetic models of CH4 hydrate decomposition and CO2 hydrate formation in NaCl solution were established.The calculated activation energies suggested that both CH4 hydrate decomposition and CO2 hydrate formation are dominated by diffusion in the hydrate phase.

英文摘要:

The replacement process of CH4 from CH4 hydrate formed in NaCl solution by using pressurized CO2 was investigated with a self-designed device at temperatures of 271.05, 273.15 and 275.05 K and a constant pressure of 3.30 MPa. The mass fraction of the NaCl solution was either 0.5 wt% or 1.0 wt%. The effects of temperature and concentration of NaCl solution on the replacement process were investigated. Experimental results showed that high temperature was favorable to the replacement reaction but high NaCl concentration had a negative effect on the replacement process. Based on the experimental data, kinetic models of CH4 hydrate decomposition and CO2 hydrate formation in NaCl solution were established. The calculated activation energies suggested that both CH4 hydrate decomposition and CO2 hydrate formation are dominated by diffusion in the hydrate phase.

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