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Enhancement of coal permeability plays the key role in methane extraction underground coalmine. As the physical blasting method, liquid CO2 phase change fracturing (LCPCF) technique can effectively stimulate the coal reservoirs, further enhance the coal permeability. In this work, the combination of scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) was adopted to quantitatively...
Coals varying in rank from lignite to anthracite were comprehensively characterized with regard to chemical structure using FTIR and Raman spectroscopy. Structural parameters were determined from spectrum deconvolution, and correlations were established for these parameters. The evolution of coal structure is complex with three stage characteristics at Ro=0.4–1.3%, 1.3–2.0% and 2.0–4.0%, respectively...
An in-depth investigation was conducted on four bituminous coals and three anthracites regarding the chemical structural characteristics using Fourier transform infrared spectroscopy (FTIR). The FTIR spectra of coals can be well approximated by the combination of Gaussian/Lorentzian peaks. FTIR parameters, including aromatic structures, aliphatic structures and oxygen-containing groups (C=O), were...
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