Experimental Study on Adsorption/Desorption of Coal Samples Based on Infrared Observation and Interpolation Calculation

Based on infrared thermal imaging method, the infrared viewing of gas adsorption/desorption process of the coal samples from different regions of the same flat surface was observed. The interpolation was used to analyze the relevant data. The research showed that the lean coal of this paper has a faster heating rate and a greater heating capacity compared with anthracite. The adsorption process accords with exponential function, while the process of desorption accords with logarithmic function. Under large scale, different regions of the coal samples have different heating temperature in the adsorption process. The amount of adsorbed gas is relatively high in the region with a high temperature rise. The concept of “correlation coefficient” is suggested, which is ξ=V_b/T_b. The amount of adsorption could be correlated with the change of temperature by this concept, then the feasibility of coalbed methane extraction in a certain area could be evaluated.