Abstract
Based on the Langmuir volume and Langmuir pressure of Xiao-Yu-Kou #3 coal’s methane adsorption, Li’s adsorption-flow equation’s parameters have been calculated. LI adsorption-flow equation obtained can visually show and quantitatively calculate that how and how much variation temperature and pressure change the absorption capacity. Partial differential equation characterizes temperature has negative effects and pressure has positive effects. Therefore, under variation temperature and pressure conditions, coal adsorption capacity would have the maximum value.
Highlights
Coal is a porous medium and natural adsorbent with well-developed void system
A large number of experimental reports indicate that the adsorption properties of coal under the combined influence of temperature and pressure can be described qualitatively as follows: 1. The adsorption temperature has a negative effect on the absorption capacity of coal, which means the absorption capacity of coal decreases with the increase of temperature; 2
Under the combined effect of temperature and pressure, the negative effects of adsorption temperature from the adsorption capacity of coal and the positive impact of adsorption pressure from the adsorption capacity of coal are all involved in competition
Summary
Coal is a porous medium and natural adsorbent with well-developed void system. Coal bed gas is usually defined as a hydrocarbon gas [1,2], which is adsorbed mainly on the surface of coal matrix particles, free in coal pores or dissolved in coal seam water. In order to find out the rule among the three variables-adsorption, temperature and pressure, one variable is usually fixed to determine the relationship between the other two variables. This relationship can be expressed by curves, such as adsorption isobaric and adsorption isometric lines. Under the combined effect of temperature and pressure, the negative effects of adsorption temperature from the adsorption capacity of coal and the positive impact of adsorption pressure from the adsorption capacity of coal are all involved in competition. It has a huge significance to establish a function equation related with both pressure and temperature on coal adsorption, which is used to qualitatively explain and quantitatively calculate the combined effect of pressure and temperature on coal adsorption. Hao Jingyuan et al.: Study on Coal Methane Adsorption Behavior Under Variation Temperature and Pressure-Taking Xia-Yu-Kou Coal for Example
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