CIESC Journal ›› 2023, Vol. 74 ›› Issue (2): 666-673.DOI: 10.11949/0438-1157.20221326

• Thermodynamics • Previous Articles     Next Articles

Hydrate equilibrium model of hydrogen-containing gas considering hydrates structure transformation

Jingbo GAO1(), Qiang SUN1(), Qing LI2, Yiwei WANG3, Xuqiang GUO3   

  1. 1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
    2.Liaohe Oilfield Safety and Environmental Protection Technology Supervision Center, Panjin 124000, Liaoning, China
    3.State Key Laboratory of Heavy Oil Processing, China University of Petroleum at Karamay, Karamay 834000, Xinjiang, China
  • Received:2022-10-08 Revised:2023-01-04 Online:2023-03-21 Published:2023-02-05
  • Contact: Qiang SUN

考虑水合物结构转变的含氢气体水合物相平衡模型

高靖博1(), 孙强1(), 李青2, 王逸伟3, 郭绪强3   

  1. 1.中国石油大学(北京)重质油国家重点实验室,北京 102249
    2.辽河油田安全环保技术监督中心,辽宁 盘锦 124000
    3.中国石油大学(北京)克拉玛依校区重质油国家重点实验室,新疆 克拉玛依 834000
  • 通讯作者: 孙强
  • 作者简介:高靖博(1996—),男,博士研究生,gaobuoy@163.com
    孙强(1981—),男,博士,副教授,sunq@cup.edu.cn
  • 基金资助:
    国家自然科学基金项目(22278424);中国石油大学(北京)重质油国家重点实验室自主研究项目(2021-05)

Abstract:

Hydrogen-containing gases commonly used in industry often contain many light hydrocarbons. The change of light hydrocarbons composition will cause the transformation of hydrate structure, which is one of the important reasons for reducing the calculation precision of hydrate thermodynamic model. Therefore, for the light hydrocarbon mixed system, a new hydrate structure parameter (niI) is introduced into the core equation of Chen-Guo hydrate model, and its coefficients are obtained by fitting experimental data, which can be used to judge and calculate the sⅠ/sⅡ hydrate transition. On this basis, hydrogen in hydrogen-containing gas is regarded as an inert gas adsorbed only by small cavities (link cavities) of hydrate, and an improved model considering hydrate structural transition is proposed to improve the prediction accuracy of hydrogen-containing gas. The calculated results show that the average relative deviation of the improved model for different light hydrocarbon gases is reduced from about 5.6% to 2.1%, and for different hydrogen-containing gases is reduced from about 8% to 2.3%. The prediction accuracy of the model has been significantly improved, which can meet the requirements of engineering applications.

Key words: model, light hydrocarbon, hydrogen, hydrate, phase equilibria, hydrate structure transformation, Chen-Guo model

摘要:

工业中常见的含氢气体往往含有较多的轻烃,而不同轻烃组成的变化能够引起水合物结构类型的转变,这也是影响水合物热力学模型预测精度的重要原因之一。因此,本文首先针对轻烃混合气体,在Chen-Guo水合物模型中引入新的水合物结构参数(niI)并通过实验数据拟合得到其参数值,以判断和计算因气体组成变化而引起的sⅠ/sⅡ型水合物转变的热力学相平衡。在此基础上,将含氢气体中的氢气视为只能被水合物小孔(联结孔)吸附的惰性气体,提出一种考虑水合物结构转变的相平衡模型,以提高含氢气体的水合物相平衡预测精度。结果表明,该模型对不同轻烃气体的水合物相平衡条件预测平均相对误差由约5.6%降至2.1%,对不同含氢气体的水合物相平衡条件预测平均相对误差由约8%降至2.3%,模型预测精度明显提高,能够满足工程应用要求。

关键词: 模型, 轻烃, 氢气, 水合物, 相平衡, 水合物结构转变, Chen-Guo模型

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