Experimental Study on the Properties of Gas Diffusion in Various Rank Coals under Positive Pressure.

ABSTRACT: A kind of closed mining and nonventilation working face is proposed, which provides a possibility for eliminating coal mine accidents and extracting high-purity gas. During mining, a confined space above normal pressure is formed in the face. Geological conditions cause significant differences in the physicochemical properties of coal and affect the occurrence and migration of gas in coal seams. The pore structures of five coal samples were obtained by mercury injection and low-temperature nitrogen adsorption. The self-made positive pressure desorption experimental device was used to conduct isothermal desorption experiments under different environmental pressures. An extended Langmuir model was proposed to carry out regression analysis on the curve of positive pressure desorption with tim

SUBMITTER: Gao T 

PROVIDER: S-EPMC10034977 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature