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Experimental study of physical‐chemical properties modification of coal after CO 2 sequestration in deep unmineable coal seams
Author(s) -
Zhao Ningning,
Xu Tianfu,
Wang Kairan,
Tian Hailong,
Wang Fugang
Publication year - 2018
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1759
Subject(s) - coal , coalbed methane , anthracite , coal mining , enhanced coal bed methane recovery , supercritical fluid , environmental science , methane , petroleum engineering , chemistry , mineralogy , chemical engineering , geology , organic chemistry , engineering
An initial investigation into the impacts of CO 2 storage in unmineable coal seams, with or without enhanced coal‐bed methane recovery (CO 2 ‐ECBM), was conducted, focusing on changes in the chemical and physical properties of coal. A high metamorphic grade anthracite was obtained from Qinshui Basin in China. Powdered coal was reacted with deionized water and carbon dioxide at temperatures of 25–35 °C and pressures of 5–11 MPa, in seven custom‐built batch reactors – conditions similar to the in situ formation conditions for the coal samples. An experiment with N 2 saturated‐water to compare CO 2 ‐free‐water mobilization with CO 2 ‐water was also performed. It was observed that the supercritical CO 2 ‐H 2 O‐coal reaction had a more significant influence on the micropores than mesopores. The micropore increase was reflected directly in the specific surface area and pore volume, which increased sharply. The true density also increased accordingly. The changes to the pore structure in the coal may affect the storage capacity of CO 2 and can modify the fluid flow pattern in the process of CO 2 ‐ECBM. Meanwhile, after exposing the coal samples to supercritical CO 2 , most of the trace‐element content in the reaction solutions was very low; only the Se and Mn content was beyond acceptable drinking water quality, but not enough to produce a serious influence on shallow aquifers. Nonetheless, the potential for mobilizing toxic trace elements from the coalbed is an important factor to be considered when evaluating CO 2 sequestration in deep unmineable coal seams. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.