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天然气水合物分解的动力学模型研究

艾志久，王杰   

  1. 西南石油大学机电工程学院，四川 成都 610500
  • 收稿日期:2016-11-09 修回日期:2017-01-08 出版日期:2017-03-10 发布日期:2017-03-10
  • 通讯作者: 王杰(1990-)，男，四川资阳人，硕士,主要从事天然气水合物研究. E-mail：611wangjie@sina.com.
  • 作者简介:艾志久(1954-)，男，河北昌黎人，教授，博士生导师，主要从事石油与天然气研究. E-mail：aizhijiu123@vip.sina.com.
  • 基金资助:

    石油天然气装备教育部重点实验室开放基金资助项目(编号：OGE201403-28)资助.

Study on kinetic model of natural gas hydrate dissociation

Ai Zhi-jiu，Wang Jie   

  1. Institute of Electrical and Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China
  • Received:2016-11-09 Revised:2017-01-08 Online:2017-03-10 Published:2017-03-10

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摘要：

基于扩散机理和化学动力学理论，提出了天然气水合物分解成冰和气体的动力学模型。该模型考虑了天然气水合物分解过程的本征动力学和冰层的孔隙结构。在准稳态近似框架中，动力学模型可以解析求解得到超越方程，从而简化了求解过程。在动力学模型中，分析了动力学参数对天然气水合物分解成冰和气体过程的影响。以粉末状甲烷水合物分解成冰和气体为例，在准稳态近似框架中估算了参数E2和f的值，也得到了甲烷气体在冰层中扩散系数的约值。同时，还解释了甲烷水合物异常的自保护效应现象。此外，该模型的试用范围还需要作进一步的验证。

关键词: 天然气水合物, 分解, 动力学模型, 冰层, 自保护效应

Abstract:

Based on diffusion mechanism and chemical kinetic theory,the kinetic model of natural gas hydrate dissociation into ice and gas is proposed.The pore structure of ice layer and the intrinsic kinetics of process of natural gas hydrate dissociation are considered in this model.In the framework of a quasi-stationary approximation,this kinetic model can be solved analytically to obtain transcendental equation and simplify the solution of this model.In the kinetic model,we analyze the effect of kinetic parameters on the process of natural gas hydrate dissociation into ice and gas.Further,the dissociation of powdery methane hydrate samples into ice and gas is taken as an example.The values of parameters E2 and f are estimated in the framework of a quasi-stationary approximation,and the approximate value of the diffusion coefficient of methane gas in the ice layer is also obtained.At the same time,it also explains the anomalous self-preservation effect of methane hydrate.Furthermore,the trial scope of this kinetic model needs to be further verified.

Key words: Natural gas hydrate, Dissociation, Kinetic model, Ice layer, Self-preservation effect

中图分类号: 

  • TE132.3

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