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The influence of porosity and structural parameters on different kinds of gas hydrate dissociation

机译:孔隙度和结构参数对不同类型天然气水合物分解的影响

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摘要

Methane hydrate dissociation at negative temperatures was studied experimentally for different artificial and natural samples, differing by macro- and micro-structural parameters. Four characteristic dissociation types are discussed in the paper. The internal kinetics of artificial granule gas hydrates and clathrate hydrates in coal is dependent on the porosity, defectiveness and gas filtration rate. The density of pores distribution in the crust of formed ice decreases by the several orders of magnitude and this change significantly the rate of decay. Existing models for describing dissociation at negative temperatures do not take into account the structural parameters of samples. The dissociation is regulated by internal physical processes that must be considered in the simulation. Non-isothermal dissociation with constant external heat flux was simulated numerically. The dissociation is simulated with consideration of heat and mass transfer, kinetics of phase transformation and gas filtering through a porous medium of granules for the negative temperatures. It is shown that the gas hydrate dissociation in the presence of mainly microporous structures is fundamentally different from the disintegration of gas hydrates containing meso and macropores.
机译:对于不同的人工和天然样品,通过宏观和微观结构参数的不同,对负温度下甲烷水合物的解离进行了实验研究。本文讨论了四种特征解离类型。煤中人造颗粒气体水合物和包合物水合物的内部动力学取决于孔隙率,缺陷和气体过滤速率。形成的冰壳中的孔隙分布密度降低了几个数量级,并且这大大改变了衰变速率。用于描述负温度下的解离的现有模型未考虑样品的结构参数。离解由模拟中必须考虑的内部物理过程调节。数值模拟了具有恒定外部热通量的非等温解离。在考虑负热的情况下,通过考虑传热和传质,相变动力学和通过多孔颗粒介质进行气体过滤的动力学来模拟解离。结果表明,在主要存在微孔结构的情况下,天然气水合物的分解与含有介孔和大孔的天然气水合物的分解有根本的不同。

著录项

  • 期刊名称 Scientific Reports
  • 作者

    S. Y. Misyura;

  • 作者单位
  • 年(卷),期 -1(6),-1
  • 年度 -1
  • 页码 30324
  • 总页数 10
  • 原文格式 PDF
  • 正文语种
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