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为探索深部煤体中地温对瓦斯赋存的影响,基于单分子层吸附理论,采用热力学理论推导出Langmuir方程,得到了温度与Langmuir吸附常数a、b随温度变化的理论表达式,进行了不同温度下的煤与瓦斯等温吸附实验;实验表明,对于给定气-固吸附体系,Langmuir吸附常数a值只与吸附质和吸附剂的自身属性有关,并由吸附剂的固有总吸附位数决定,而与外界的温度和压力无关;对于同一种煤而言,可以认为a值是一个常数。不同吸附剂的b值因吸附剂自身物理特性的不同也会有一定的差异;b值随温度的升高逐渐减小,用导出的理论方程证明了温度与a、b值的统计热力学关系,并用实验进行了证实,澄清了以往温度与a、b值关系的实验性争议。工程应用中,在一定温度区间内,吸附常数b值与温度的关系可以采用线性减函数简化描述。
In order to explore the influence of ground temperature on gas occurrence in deep coal, a Langmuir equation was deduced by thermodynamic theory based on the theory of monolayer adsorption. The theoretical expressions of temperature and Langmuir adsorption constant a, b with temperature were obtained. Experiments show that for a given gas-solid adsorption system, the Langmuir adsorption constant a value is only related to the properties of the adsorbate and the adsorbent, and is determined by the inherent adsorption sites of the adsorbent , And has nothing to do with the temperature and pressure of the outside world; for the same type of coal, can be considered a value is a constant. The b values of different adsorbents will also be different due to the different physical properties of the adsorbents. The b value decreases with increasing temperature, and the statistical thermodynamic relationship between temperature and a and b values is proved by the derived theoretical equation. And experiments were confirmed, to clarify the previous temperature and a, b value of the experimental controversy. Engineering applications, in a certain temperature range, the relationship between the adsorption constant b value and temperature can be reduced by linear reduction function description.