Modeling and experiment for effective diffusion coefficient of gas in water-saturated coal
被引:116
作者:
Si, Leilei
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机构:
Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R ChinaHenan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Si, Leilei
[1
,2
,3
]
Zhang, Hongtu
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机构:
Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R ChinaHenan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Zhang, Hongtu
[1
,2
,3
]
Wei, Jianping
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机构:
Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R ChinaHenan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Wei, Jianping
[1
,2
,3
]
Li, Bo
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机构:
Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R ChinaHenan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Li, Bo
[1
,2
,3
]
Han, Hongkai
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机构:
Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R ChinaHenan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
Han, Hongkai
[1
,2
,3
]
机构:
[1] Henan Polytech Univ, Sch Safety Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
[2] Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454003, Henan, Peoples R China
[3] State Collaborat Innovat Ctr Coal Work Safety & C, Jiaozuo 454003, Henan, Peoples R China
The diffusion of gas in water-saturated porous media plays a significant role in CO2 geological sequestration and mine gas prevention and control. However, it is lack of an accurate model to calculate the effective diffusion coefficient of gas in a water-saturated coal core. In this work, an improved model was constructed to calculate the effective diffusion coefficient of gas in a water-saturated coal core by considering both the gas adsorption in residual pore and the gas dissolution in pore water. By using a PVT (Pressure-Volume-Temperature) test method, the calculation results of improved model are in the range of 1.03 x 10(-12) similar to 30.40 x 10(-12)m(2)/s, which are 5 similar to 6 orders of magnitude lower than those calculated by traditional model, because the traditional model only considers the gas dissolution in pore water. Therefore, the results of improved model are more in line with the actual situation. Furthermore, the saturated moisture, equilibrium moisture and NMR experiments were carried out. Results shows that, the saturated moisture and equilibrium moisture decreases with the rising coal rank. The pore size changes from micropore/mesopore-dominated to micropores-dominated as the coal rank rise. In addition, the proportion of open porosity gradually reduces with the rising coal rank, while the closed porosity increases, indicating that the pore connectivity decreases with the growing coal rank. Finally, the influences of adsorbability, pore structure, pressure and liquid properties on the effective diffusion coefficient were analyzed.
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Ji, Huaijun
;
Li, Zenghua
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机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Li, Zenghua
;
Peng, Yingjian
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机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Peng, Yingjian
;
Yang, Yongliang
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机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Yang, Yongliang
;
Tang, Yibo
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机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Tang, Yibo
;
Liu, Zhen
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h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Ji, Huaijun
;
Li, Zenghua
论文数: 0引用数: 0
h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Li, Zenghua
;
Peng, Yingjian
论文数: 0引用数: 0
h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Peng, Yingjian
;
Yang, Yongliang
论文数: 0引用数: 0
h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Yang, Yongliang
;
Tang, Yibo
论文数: 0引用数: 0
h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
Tang, Yibo
;
Liu, Zhen
论文数: 0引用数: 0
h-index: 0
机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China
China Univ Min & Technol, Key Lab Gas & Fire Control Coal Mines, Xuzhou 221008, Peoples R ChinaChina Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Peoples R China