Simulation experiment on the changes of pore structure in different ranks coals during the CO2 geosequestration
Simulation experiment on the changes of pore structure in different ranks coals during the CO2 geosequestration
A high pressure supercritical CO geochemical reactor was used to simulate the CO sequestration process into deep coal seam under around 40°C and 9.8 MPa for 72 hours. The changes of pore structure of different rank coal samples with and without the supercritical CO treatment were investigated by helium pycnometer and mercury porosimetry. The results show that the true density of anthracite increase from 1.51 g/cm to 1.59 g/cm while that of other rank samples have no significant changes after being treated by the HP-ScCO-HO system. All the bulk densities decrease, of which lignite and low volatile bituminous decreased by 0.1 g/cm. The growth rate of total pore volume and porosity of lignite are 85% and 118% respectively, which are mainly attributed to the increase in macropores. Pore structures of coal during CO sequestration are mainly influenced by macropores and mesopores in low rank coals, while in high rank coals mainly by micropores, which increase the surface area of coal. As shown in anthracite, the surface area increase from 24.3 m/g to 27.6 m/g, which accordingly enhance the gas adsorption. The "ink-bottle" pores are influenced during CO sequestration process from analysis on hysteresis of the extrusion curves.
- University of Queensland Australia
- University of Queensland Australia
CO2 sequestration, Coal, 670, 2205 Civil and Structural Engineering, 2210 Mechanical Engineering, 1909 Geotechnical Engineering and Engineering Geology, Pore structure, 1907 Geology
CO2 sequestration, Coal, 670, 2205 Civil and Structural Engineering, 2210 Mechanical Engineering, 1909 Geotechnical Engineering and Engineering Geology, Pore structure, 1907 Geology
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