Experimental Study On Adsorption/desorption Characteristics Of Coal And Rock Gas

As one of the clean energy sources,gas is mainly stored in coal and rock,and the difficulty of desorption and slow desorption of gas in coal seams are the common characteristics of most coal reservoirs in our country,which brings great difficulties to gas management.Therefore,studying the effects of different levels of metamorphism,pressure,temperature,and particle size on coal adsorption/desorption gas is of great significance for mining clean gas resources and preventing gas disasters.This article mainly carried out experiments on anthracite,coking coal,gas coal and gas fat coal on the experimental platform of high-pressure gas adsorption instrument under constant temperature water bath conditions,and carried out experiments on the influence of coal on gas adsorption/desorption at different temperatures to study the effects of different deterioration degrees.Coal adsorption/desorption gas influence.In addition,this thesis also carried out experiments on the adsorption/desorption of gas by coal at different temperatures and different particle sizes on two adjacent coal seams 11-2 and 13-1 in Pansan Mine.The experimental results show that the degree of coal metamorphism has different effects on the adsorption/desorption characteristics under different gas pressures,and the amount of gas adsorption increases as the degree of coal metamorphism increases.Different coal samples have different atmospheric desorption characteristics.During the desorption process,the maximum gas desorption rate is negatively related to the degree of coal metamorphism;during the pressure swing desorption process of coal samples of different metamorphism,the desorption amount and desorption rate are different,and the desorption is complete After that,the residual amount of methane is positively correlated with the degree of coal metamorphism;the desorption hysteresis of methane is negatively correlated with the degree of coal metamorphism,that is,the higher the degree of coal metamorphism,the easier it is to reach the dynamic adsorption/desorption balance;In the analysis of desorption data,it was found that when the adsorption/desorption equation corrected by pressure P in the langmuir adsorption equation was used to fit the coal adsorption methane curve,it was more consistent with the experimental results;the equal adsorption heat of different coal samples is different,and the desorption process of coal samples is different.The isometric heat of adsorption is greater than the absolute value of the isometric heat of adsorption in the adsorption process;the adsorption parameters of adjacent coal seams are different under different conditions.The adsorption capacity and adsorption rate of methane in the 11-2 coal seam of Pansan Mine are both greater than that of the 13-1 coal,and Comparing the adsorption/desorption differences of coal samples from adjacent coal seams,it is found that the differences are negatively correlated with temperature changes.As the temperature increases,the adsorption and desorption characteristics of the coal samples are closer;as the pressure increases,the coal samples in adjacent coal seams The greater the difference in the adsorption characteristics of coal samples,the greater the desorption characteristics of different coal samples.Figure[48]table[25]reference[80]...