The Effect of Coal Sample Particle Size on Coal Adsorption Constants and Initial Speed of Methane Diffusing

Adopting the Langmuir monolayer adsorption theory, the experimental research was done for adsorbing methane under the different particle size conditions. By using the WY-98A gas constant determinator and WFC-2 initial speed determinator of methane diffusing, it made the qualitative and quantitative analysis for the curve of isothermal adsorption, adsorption constants a and b and initial speed of methane diffusing △p for different coal samples under the different particle size conditions, and obtained the relationship of adsorption constant a and initial speed of methane diffusing △p with the particle size change. The results showed that adsorption constant a would present periodic change with particle size varying, and the initial speed of methane diffusing △p took on the variation law of logarithmic function.