Estimation and modeling of coal pore accessibility using small angle neutron scattering
Abstract
Gas diffusion in coal is controlled by nano-structure of the pores. The interconnectivity of pores not only determines the dynamics of gas transport in the coal matrix but also influences the mechanical strength. In this study, small angle neutron scattering (SANS) was employed to quantify pore accessibility for two coal samples, one of sub-bituminous rank and the other of anthracite rank. Moreover, a theoretical pore accessibility model was proposed based on scattering intensities under both vacuum and zero average contrast (ZAC) conditions. Our results show that scattering intensity decreases with increasing gas pressure using deuterated methane (CD4) at low Q values for both coals. Pores smaller than 40 nm in radius are less accessible for anthracite than sub-bituminous coal. On the contrary, when the pore radius is larger than 40 nm, the pore accessibility of anthracite becomes larger than that of sub-bituminous coal. Only 20% of pores are accessible to CD4 for anthracite and 37% for sub-bituminous coal, where the pore radius is 16 nm. For these two coals, pore accessibility and pore radius follows a power-law relationship.
- Authors:
-
- Pennsylvania State Univ., University Park, PA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1265817
- Alternate Identifier(s):
- OSTI ID: 1247723
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Fuel
- Additional Journal Information:
- Journal Volume: 161; Journal Issue: C; Journal ID: ISSN 0016-2361
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; pore accessibility; SANS; coal pore characterization; accessibility modeling
Citation Formats
Zhang, Rui, Liu, Shimin, Bahadur, Jitendra, Elsworth, Derek, Melnichenko, Yuri, He, Lilin, and Wang, Yi. Estimation and modeling of coal pore accessibility using small angle neutron scattering. United States: N. p., 2015.
Web. doi:10.1016/j.fuel.2015.08.067.
Zhang, Rui, Liu, Shimin, Bahadur, Jitendra, Elsworth, Derek, Melnichenko, Yuri, He, Lilin, & Wang, Yi. Estimation and modeling of coal pore accessibility using small angle neutron scattering. United States. https://doi.org/10.1016/j.fuel.2015.08.067
Zhang, Rui, Liu, Shimin, Bahadur, Jitendra, Elsworth, Derek, Melnichenko, Yuri, He, Lilin, and Wang, Yi. Fri .
"Estimation and modeling of coal pore accessibility using small angle neutron scattering". United States. https://doi.org/10.1016/j.fuel.2015.08.067. https://www.osti.gov/servlets/purl/1265817.
@article{osti_1265817,
title = {Estimation and modeling of coal pore accessibility using small angle neutron scattering},
author = {Zhang, Rui and Liu, Shimin and Bahadur, Jitendra and Elsworth, Derek and Melnichenko, Yuri and He, Lilin and Wang, Yi},
abstractNote = {Gas diffusion in coal is controlled by nano-structure of the pores. The interconnectivity of pores not only determines the dynamics of gas transport in the coal matrix but also influences the mechanical strength. In this study, small angle neutron scattering (SANS) was employed to quantify pore accessibility for two coal samples, one of sub-bituminous rank and the other of anthracite rank. Moreover, a theoretical pore accessibility model was proposed based on scattering intensities under both vacuum and zero average contrast (ZAC) conditions. Our results show that scattering intensity decreases with increasing gas pressure using deuterated methane (CD4) at low Q values for both coals. Pores smaller than 40 nm in radius are less accessible for anthracite than sub-bituminous coal. On the contrary, when the pore radius is larger than 40 nm, the pore accessibility of anthracite becomes larger than that of sub-bituminous coal. Only 20% of pores are accessible to CD4 for anthracite and 37% for sub-bituminous coal, where the pore radius is 16 nm. For these two coals, pore accessibility and pore radius follows a power-law relationship.},
doi = {10.1016/j.fuel.2015.08.067},
journal = {Fuel},
number = C,
volume = 161,
place = {United States},
year = {Fri Sep 04 00:00:00 EDT 2015},
month = {Fri Sep 04 00:00:00 EDT 2015}
}
Web of Science
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