Kai Wang

TL;DR: A review of the state of the art on the gas diffusion in coal particles from the aspects of definition, mathematical models, experimental methods, and applications in environment, energy and mining safety areas is presented in this paper.

TL;DR: In this article, three series of coal samples collected from three key CBM development basins with graded vitrinite reflectance values (R o ), the eastern Junggar basin ( R o of approximately 0.5%), eastern Ordos basin and southern Qinshui basin (R O of approximately 3.0%), were systematically characterized by optical observations, low-temperature nitrogen adsorption/desorption, and nuclear magnetic resonance (NMR) methods.

TL;DR: In this paper, the pore size distribution (PSD) of six coal samples ranges from medium to high rank are measured by NMR cryoporometry and low-temperature liquid N2 adsorption and desorption (LTNAD) experiments are also carried out on the same samples for the comparison analysis.

TL;DR: In this article, an analytical model was proposed to represent the anisotropic permeability evolution of coal due to effective stress change and gas sorption, and this model captured both mechanical properties and gas-sorption-induced directional strains.

TL;DR: In this paper, the authors provide a comprehensive review of the coal-gas compound dynamic disasters in the past 30 years and discuss the mechanism, classifications, typical case analysis, prediction and prevention of coal gas compound dynamic disaster, and urgent problems and directions in future research.