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Research Papers: Fuel Combustion

Sorption Hysteresis Characterization of CH4 and CO2 on Anthracite, Bituminous Coal, and Lignite at Low Pressure

[+] Author and Article Information
Zhenjian Liu

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
Chongqing University,
No. 174 Shazhengjie Street, Shapingba District,
Chongqing 400044, China
e-mail: lzyjian@163.com

Zhenyu Zhang

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
Chongqing University,
No. 174 Shazhengjie Street, Shapingba District,
Chongqing 400044, China
e-mail: zyzhang@cqu.edu.cn

Yiyu Lu

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
Chongqing University,
No. 174 Shazhengjie Street, Shapingba District,
Chongqing 400044, China
e-mail: luyiyu@cqu.edu.cn

Sing Ki Choi

Commonwealth Scientific and Industrial
Research Organization (CSIRO),
CSIRO Energy, Gate 7,
71 Normanby Road,
Clayton 3168, Victoria, Australia
e-mail: Xavier.Choi@csiro.au

Xiaoqian Liu

State Key Laboratory of Coal Mine Disaster
Dynamics and Control,
Chongqing University,
No. 174 Shazhengjie Street, Shapingba District,
Chongqing 400044, China
e-mail: liuxq@cqu.edu.cn

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 2, 2017; final manuscript received July 26, 2017; published online August 22, 2017. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 140(1), 012203 (Aug 22, 2017) (9 pages) Paper No: JERT-17-1148; doi: 10.1115/1.4037483 History: Received April 02, 2017; Revised July 26, 2017

Sorption hysteresis characterization of CH4 and CO2 on lignite, bituminous coal, and anthracite were studied to improve the understanding of the interaction between gas molecules and different ranks of coal and further improve the precision of the adsorption methods in characterizing pore structure at low pressure. Pore structure of three ranks of coal was investigated with scanning electron microscopy (SEM) and nitrogen (N2) adsorption. Then, CH4 and CO2 sorption isotherms were measured using the gravimetric method under 288, 308, and 328 K. The N2 sorption isotherms show that a wide distribution of pore size existed in three coal samples, and with the process of coalification, the specific surface area (SSA) decreased and then increased, while the pore size of coal monotonically decreased. This is confirmed by SEM observation. The measured sorption isotherms were then decomposed into simultaneously running adsorption and absorption branches based on the assumption that the former is totally reversible and the latter completely irreversible. The reconstructed adsorption branches can be well described by both Langmuir model and Dubinin–Radushkevich (D–R) equation. The absorption, which represents the sorption hysteresis portion, increased with pressure, but decreased with temperature. The absorbed amount of gas increased with pressure, but the absorption of CO2 increased concavely with gas pressure while CH4 followed an upward exponential function. Also, the absorption varied with coal rank, following a U-shaped function. This study can provide new insights to CH4 and CO2 sorption hysteresis on coal and other organic geomaterials.

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References

Figures

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Fig. 1

Schematic diagram of experimental setup

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Fig. 2

N2 adsorption and desorption isotherms of the three coal samples at 77 K

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Fig. 3

Cumulated surface area versus pore width of the coal samples

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Fig. 4

Pore size distribution of the three coal samples

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Fig. 5

SEM images of coal samples at a magnification time of 5000

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Fig. 6

Sorption isotherms of CO2 (a) and CH4 (b) on coals at 288, 308, and 328 K

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Fig. 7

Division of the sorption isotherms at 308 K

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Fig. 8

Langmuir fitting of adsorption at 288, 308, and 328 K: (a) CO2 and (b) CH4

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Fig. 9

D-R fitting of adsorption at 288, 308, and 328 K: (a) CO2 and (b) CH4

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Fig. 10

Gas absorption on coal at 288, 308, and 328 K: (a) CO2 and (b) CH4

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