高温高压下瓦斯在煤体内表面吸附力变化研究

Study on Gas Adsorption Capacity on Coal Surface Under High Temperature and Pressure

采用实验的方法研究了3种煤样在高温高压条件下瓦斯在煤体内表面的吸附规律。通过研究发现:在高温高压作用下,瓦斯的吸附过程仍可以用朗格缪尔模型准确描述,同等压力条件下,所有煤样的瓦斯吸附能力随温度升高而明显下降。瓦斯饱和吸附量总体上都随着温度的升高而降低,变质程度高的煤样的朗格缪尔吸附压力随着温度的升高其下降速率较另2个煤样更快。此外瓦斯在不同温度条件下的饱和吸附量随固定碳含量增加而增加,在25、40、80℃时,饱和吸附量随挥发分含量增高而降低,但是在120℃时,先降低后增加。

The adsorption laws of gas on the surface of three kinds of coal samples under high temperature and pressure were studied experimentally. Research shows that the gas adsorption under high temperature and pressure could be described by Langmuir model. At the same pressure condition, the gas adsorption capacity decreases with the increase of temperature. The gas saturated adsorption capacity decreases with the increase of temperature, the Langmuir adsorption pressure of the coal samples with high degree of metamorphism decreases faster with the increase of temperature than that of the other two coal samples. In addition,the saturated adsorption amount of gas at different temperature increases with the increase of fixed carbon content. At 25, 40, 80℃, the saturated adsorption decreases with the increase of volatile matter content, but at 120 ℃, it first decreases and then increases.