Study On The Adsorption Characteristics Of Coal To Methane In The DC Pulse Electric Field

This paper has studied the adsorption characteristics of coal to methane in the DC pulse electric field. Because most coal-bed methane in our country is stored in the low permeability and low saturation condition, The exploitation of coal-bed gas faces great difficulties, at the same time, there will be a threat to personnel safety under the mine, this topic will be a certain significance for CBM exploitation of Engineering technology.In order to study the effect which electric field has on the adsorption capacity of coal to methane and the adsorption constants a&b, we use the DC pulse power supply and the drainage method of Capacity, and carry out this experiment by changing the frequency and the voltage of DC pulse. In this experiment, the gas adsorption devices are designed, including the designing of the adsorption cylinder, and the selection of the DC pulse power, and the volume-tubes and the gas purifier. Data collection need use the data acquisition card and the software of Lab View, and data processing need use the software of Origin.The results show that under the influence of the DC pulse electric field, the adsorption capacity of coal to methane still follows the Langmuir isotherm adsorption curves; DC pulse electric field can inhibit the adsorption characteristics of coal to methane, that is to say, with the electric field frequency and voltage increasing, the adsorption capacity of coal to methane declines; DC pulse electric field decreases the specific surface area of coal,and it leads to weaken the adsorption capacity of coal to methane; meanwhile the adsorption constant b reduces with the frequency and power increasing of DC pulse electric field and there is a negative index relation between b and the frequency and power, but the adsorption constant a remains basically unchanged.