化学学报 ›› 2007, Vol. 65 ›› Issue (19): 2187-2196. 上一篇    下一篇

研究论文

利用两种模型预测多孔介质中气体水合物平衡分解条件

李小森*, 张郁, 陈朝阳, 李刚, 唐良广, 颜克凤   

  1. (中国科学院广州能源研究所 广州 510640)
  • 投稿日期:2006-11-06 修回日期:2007-01-08 发布日期:2007-10-14
  • 通讯作者: 李小森

Equilibrium Dissociation Conditions for Gas Hydrate in Porous Media Using Two Models

LI Xiao-Sen*; ZHANG Yu; CHEN Zhao-Yang; LI Gang; TANG Liang-Guang; YAN Ke-Feng   

  1. (Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences, Guangzhou 510640)
  • Received:2006-11-06 Revised:2007-01-08 Published:2007-10-14
  • Contact: LI Xiao-Sen

分别利用两种热力学方法(基于逸度相等的方法与基于活度相等的方法)预测了不同多孔介质中气体水合物的平衡分解条件, 对于非水合物相, 逸度方法采用Trebble-Bishnoi (TB)方程, 而活度方法则使用Soave-Redlich-Kwong (SRK)方程, 对于水合物相, 两种方法都利用了van der Waals-Platteeuw模型结合Llamedo等关于毛细管力作用模型来模拟. 两种方法的预测结果与实验结果吻合, 逸度方法的预测效果要好于活度方法.

关键词: 水合物, 多孔介质, 平衡分解条件, 逸度, 活度

Gas hydrate equilibrium dissociation conditions in the porous media were predicted using two thermodynamic approaches, based on equal fugacities and equal activities, respectively. For non-hydrate phase, the Trebble-Bishnoi (TB) equation was employed in the fugacity approach, while the Soave-Redlich- Kwong (SRK) equation was applied in the activity approach. For the hydrate phase, the van der Waals- Platteeuw model in conjunction with the capillary model of Llamedo et al. was used in both the two approaches. The predictions by the two approaches were all in good agreement with the experimental data. The prediction accuracy of the fugacity approach is better than that of the activity approach.

Key words: hydrate, porous media, equilibrium dissociation condition, fugacity, activity