Experimental Research Of Partial Pressure Desorption Characteristics Of Single And Multicomponent Gases On Coal Under Different Temperature And Pressure

Although China is rich in coal resources,with the long-term mining of coal resources,most of the mines in China have been transferred from the shallow mining to deep mining.At the same time,with the improvement of mining depth,problems such as high temperature,high ground stress and high gas pressure gradually appear.Therefore,it is more important to further clarify the rule of temperature and pressure in coal gas desorption process.In this paper,a single component of CH4.CO2.N2 and three differentconcentration of CH4/CO2/N2 multi COcomponent gas are selected as the experimental gases.At the same time,the high pressure adsorption instrument was used to carry out the adsorption/desorption experiments of.three groups of single and multi component gases.According to the adsorption/desorption experiment result of single and multi component gas,the characteristic parameter of single and multi component gas such as the adsorption constant,adsorption quantity,desorption quantity,desorption rate and the experiment temperature and pressure were obtained.According to the above characteristic parameters,the desorption isothermal curve and the variation rule of each component gas concentration of single and multi component gas have been obtained.Through comparison and analysis,the law of partial pressure and desorption of coal to single and multi component gas were obtained.In order to quantitatively describe the effect of temperature and pressure on the partial pressure and desorption of single and multi component gas,the solution absorption and desorption rate of single component and multi component gas are studied,and the effects of temperature and pressure on the desorption and desorption rate of single and multi component gas were obtained.There is a linear positive correlation between the temperature and the desorption rate of the single and multi component gas.The desorption equilibrium pressure and the single and multi component gas desorption rate are exponentially related,and the solution absorption of single and multi component gas shows a parabolic relationship,and the corresponding formula is used to fit the above parameters.At the same time,according to the mechanism of the influence of temperature and pressure on desorption,it is suggested that the temperature and pressure are the desorption of gas by influencing the molecular kinetic energy of adsorbate and the average free range of adsorbate molecules.Comprehensive analysis the influence of temperature and pressure on desorption characteristic parameters of single and multi component gas,the effect of temperature and pressure on coal partial pressure desorption was proposed.