期刊
FUEL
卷 108, 期 -, 页码 137-142出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2011.12.014
关键词
CO2-ECBM; Coal composition; Physical structure; Diffusion coefficient
资金
- National Science Foundation of China [21176244]
- MOVECBM project under the 6th Framework Program of European Commission
- National Basic Research Program of China [2010CB227003]
- Shell International Exploration
The aim of this study is to understand details about the sample size influence on the CH4 and CO2 sorption behaviors of coals. Two anthracites (YQ and QS) were selected, ground and sieved. Four size fractions (from powder size -0.354 mm to the lump size 4-10 mm) were tested. The manometric method was used to determine the CH4 and CO2 sorption isotherms and kinetics. The unipore diffusion model was selected for sorption kinetic modeling. Although the compositions of the different size fractions generally exhibit slight variations the isotherms with different sample basis (air-dried, ash-free or dry-ash-free) are not apparently different, except for the largest size YQ sample that contains significantly higher amounts of minerals. However, the ash correction'' or the ash-moisture correction'' made the sorption isotherm of the largest size YQ sample deviate from the main trend. The predicted effective diffusion coefficients of CH4 and CO2 for both coal samples increase, however, unexpectedly with the increase of the sample size. It is probably due to the differences in the mineral contents, the improper estimation of sample size, and the differences in pore structures. (C) 2011 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据