页岩高温高压吸附动力学实验研究

High temperature and pressure methane adsorption characteristics and adsorption kinetics of shale

  • 摘要: 针对目前尚未用吸附动力学方法来研究页岩吸附特征的情况,设计并开展了页岩高温高压吸附实验与吸附动力学实验,实验温度分别为40.6,60.6,75.6,95.6℃,实验压力为0~50 MPa;获取了页岩高温高压等温吸附曲线及吸附动力学曲线并对各曲线进行了详细分析。研究表明:0~50 MPa压力范围内页岩等温吸附曲线没有单调递增特征而是存在一个极大值,温度越高极大值对应的压力越大;在0~50 MPa内可能存在一个临界温度,大于该温度时过剩吸附量与压力保持单调递增趋势,40~100目页岩颗粒的吸附平衡时间约为4 h;Bangham吸附动力学方程比较适合描述页岩吸附甲烷的动力学过程;温度越高、压力越大,Bangham吸附速率常数越小,吸附量增加越困难。

     

    Abstract: To understand the methane adsorption and adsorption kinetics characteristics of shale under high tempera- ture and pressure,some adsorption and adsorption kinetics experiments were carried out with 0-50 MPa,temperature ranges at 40. 6,60. 6,75. 6 and 95. 6 ℃ . Adsorption isotherms and kinetics curves were obtained and a detailed analy- sis was performed. Results show that all the excess adsorption isotherms have a maximum value over 0 -50 MPa;the higher the temperature,the bigger the pressure,which corresponds to the maximum of one excess isotherm;there exists a critical temperature for each isotherm,and if the test temperature is greater than the critical temperature,the excess adsorption isotherm is monotonically increasing with pressure;the adsorption equilibrium time is about four hours for the 40-100 mesh number shale;Bangham kinetics equation is more suitable for describing the kinetic process of meth- ane adsorption.

     

/

返回文章
返回
Baidu
map