Export to Refworks Export to EndNote Email
Report an Issue

Estimation and modeling of coal pore accessibility using small angle neutron scattering [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
pages 323-332 : digital, PDF file
Additional Creators:
Oak Ridge National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It

Finding items...

Restrictions on Access:
Free-to-read Unrestricted online access
Summary:
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.
Report Numbers:
E 1.99:1265817
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
09/04/2015.
"KC0402010"
"ERKCSNX"
Fuel 161 C ISSN 0016-2361 AM
Rui Zhang; Shimin Liu; Jitendra Bahadur; Derek Elsworth; Yuri Melnichenko; Lilin He; Yi Wang.
Funding Information:
AC05-00OR22725
View MARC record | catkey: 23505021