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Experimental Investigation into the Dissociation Behavior of CH_4-C_2H_6-C_3H_8 Hydrates in Sandy Sediments by Depressurization

机译:降压作用下沙质沉积物中CH_4-C_2H_6-C_3H_8水合物解离行为的实验研究

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摘要

The dissociation kinetics of gas hydrate formed from binary CH4 C3H8 and ternary CH4 C2H6 C3H8 gas mixtures were studied by a gas-collection-analysis method at constant back-pressure and different temperatures. During hydrate dissociation, the gas produced was first collected by sample bags consecutively and then analyzed by gas chromatography. It was found that the gas production of the mixed hydrates was quite different from that of methane hydrate. Interestingly, the molar composition of C3H8 in the gas mixture produced changed little as hydrate dissociation proceeded. The retainment of C3H8 in hydrates was confirmed with the calculation results of composition of hydrates remained during gas production. The preferential of CH4 and C2H6 over C3H8 molecules released from hydrate decomposition was attributed to the difference in guest-to-cavity size ratios. The heterogeneous dissociation of the multiple guests complicates the gas production process as the remaining hydrate rich in C3H8 may act as a barrier to gas diffusion. The self-preservation model for CH4 hydrate dissociation below ice point was applied to describe the heterogeneous dissociation of the mixed hydrates, suggesting that the dissociation kinetics of the mixed hydrates containing C3H8 above ice point was similar to that of CH4 hydrate below ice point. These results are of interest for the gas recovery from hydrates, and for natural gas storage and transportation in the hydrate state.
机译:通过气体收集-分析方法研究了在恒定背压和不同温度下由二元CH4 C3H8和三元CH4 C2H6 C3H8混合气形成的水合物的分解动力学。在水合物分解过程中,首先通过样品袋连续收集产生的气体,然后通过气相色谱分析。结果发现,混合水合物的产气量与甲烷水合物的产气量大不相同。有趣的是,随着水合物分解的进行,生成的气体混合物中C3H8的摩尔组成几乎没有变化。通过气体产生过程中残留的水合物组成的计算结果证实了C 3 H 8在水合物中的保留。 CH4和C2H6优先于水合物分解所释放的C3H8分子归因于客体与腔体尺寸比的差异。多个客体的异质离解使气体生产过程复杂化,因为富含C3H8的剩余水合物可能会阻碍气体扩散。采用冰点以下CH4水合物分解的自保存模型描述了混合水合物的非均质解离,表明冰点以上含C3H8的混合水合物的分解动力学与冰点以下CH4水合物的分解动力学相似。这些结果对于从水合物中回收气体,以及以水合物状态进行天然气的存储和运输都是有意义的。

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  • 来源
    《Energy & fuels》 |2018年第1期|204-213|共10页
  • 作者单位

    Jilin Univ, Coll Construct Engn, Key Lab Drilling & Exploitat Technol Complex Cond, Minist Land & Resources, Changchun 130026, Jilin, Peoples R China;

    Jilin Univ, Coll Construct Engn, Key Lab Drilling & Exploitat Technol Complex Cond, Minist Land & Resources, Changchun 130026, Jilin, Peoples R China;

    Jilin Univ, Coll Construct Engn, Key Lab Drilling & Exploitat Technol Complex Cond, Minist Land & Resources, Changchun 130026, Jilin, Peoples R China;

    Gas Liquids Engn Ltd, Calgary, AB T1Y 4T8, Canada;

    China Geol Survey, Key Lab Unconvent Petr Geol Oil & Gas Survey, Beijing 100029, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:39:04

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