The Adsorption/desorption Of Methane On Tectonic Coal Based On Adsorption Potential Theory

The structural characteristics of tectonic coal are determines of low strength, highadsorption, desorption and rapid low permeability characteristic which are the basiccauses of the gas outburst; Meanwhile, it is also the reason of gas emission uncertaintyAND gas gathered. What’s more it is the direct reason of the difficulty of the coal minegas extraction. Therefore, to determine the adsorption quantity of methane, study onfactors of adsorption performance of methane, and enrich adsorption mechanism ofmethane from tectonic coal aspect can be more accurate to solve practical problems.What we mentioned above is beneficial to the development of coal bed gas, preventionand cure of the methane gas outburst, and can solve the greenhouse gas emissions, thathave very important theoretical significance and practical application value.The thesis based on the adsorption potential theory. According to experiments onmethane adsorption/desorption of tectonic coal, establish-Vadadsorption/desorptioncharacteristics curve, and further establish tectonic coal adsorption/desorptiontemperature-pressure of methane comprehensive model, and modify and have deviationanalysis. The main obtained conclusions in this paper are as follows:(1) The methane adsorption/desorption experiment and the results of the eightdifferent samples are as follows：Different temperature condition, adsorption/desorption quantity of the primarystructure of coal and tectonic coal will decrease with temperature increased. Tectoniccoal adsorption with temperature reduction of the law is not particularly obvious. It maybe due to the unobvious porosity structures which are influenced by the tectonic coalcharacteristics.Different temperature condition, the desorption curve OF the primary structure ofcoal and tectonic coal does not follow the low, decreasing with temperature increasing.Under the same temperature conditions and the same pressure condition, theadsorption/desorption of tectonic coal is much higher than that of the primary structureof coal; under the same pressure, with the increase of temperature, theadsorption/desorption difference between the tectonic coal and primary structure COALwill be increased. Under the same temperature condition, adsorption/desorption curve fitting effect ofthe primary structure of coal is better, basically in the same curve, and obviously theadsorption and desorption reaction-reversible process. The adsorption/desorption curvefitting effect of tectonic coal is not obvious. Difference of the adsorption/desorptioninitial stage are the most obvious, with pressure increasing and adsorption pointgradually fitting; with temperature increasing, the difference is much more seen. Butfrom another aspect, it reflects the properties of tectonic coal, fast initial velocity escapeand a large quantity of desorption.(2) From different sample experiments based on adsorption potential theory, wemade the data fitting adsorption characteristic curve, and found the some basiccharacteristics curve in the same curve can be expressed by the equation.(3)We find adjusted temperature-pressure comprehensive adsorption/desorptionmodel and have deviation statistics of the forecast results.