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首页> 外文期刊>Applied Energy >Isostructural and cage-specific replacement occurring in sII hydrate with external CO2/N-2 gas and its implications for natural gas production and CO2 storage
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Isostructural and cage-specific replacement occurring in sII hydrate with external CO2/N-2 gas and its implications for natural gas production and CO2 storage

机译：用外部CO2 / N-2气体在sII水合物中发生同构和笼特定的置换及其对天然气生产和CO2储存的影响

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摘要

A replacement technique has been regarded as a promising strategy for both CH4 exploitation from gas hydrates and CO2 sequestration into deep-ocean reservoirs. Most research has been focused on replacement reactions that occur in sI hydrates due to their prevalence in natural gas hydrates. However, sII hydrates in nature have been also discovered in some regions, and the replacement mechanism in sII hydrates significantly differs from that in sI hydrates. In this study, we have intensively investigated the replacement reaction of sII (C3H8 + CH4) hydrate by externally injecting CO2/N-2 (50:50) gas mixture with a primary focus on powder X-ray diffraction, Raman spectroscopy, NMR spectroscopy, and gas chromatography analyses. In particular, it was firstly confirmed that there was no structural transformation during the replacement of C3H8 + CH4 hydrate with CO2/N-2 gas injection, indicating that sll hydrate decomposition followed by sI hydrate formation did not occur. Furthermore, the cage-specific replacement pattern of the C3H8 + CH4 hydrate revealed that CH4 replacement with N-2 in the small cages of slI was more significant than C3H8 replacement with CO2 in the large cages of sII. The total extent of the replacement for the C3H8 + CH4 hydrate was cross-checked by NMR and GC analyses and found to be approximately 54%. Compared to the replacement for CH4 hydrate with CO2/N-2 gas, the lower extent of the replacement for the C3H8 + CH4 hydrate with CO2/N-2 gas was attributable to the persistent presence of C3H8 in the large cages and the lower content of N-2 in the feed gas. The structural sustainability and cage-specific replacement observed in the C3H8 + CH4 hydrate with external CO2/N-2 gas will have significant implications for suggesting target gas hydrate reservoirs and understanding the precise nature of guest exchange in gas hydrates for both safe natural gas production and long-term CO2 sequestration. (C) 2016 Elsevier Ltd. All rights reserved.
机译：替代技术被认为是从天然气水合物中开采CH4和将CO2封存到深海储层中的一种有前途的策略。由于sI水合物在天然气水合物中的普遍性，大多数研究都集中在sI水合物中发生的替代反应上。但是，自然界中也发现了sII水合物，并且sII水合物中的取代机理与sI水合物中的取代机理明显不同。在这项研究中，我们通过外部注入CO2 / N-2（50:50）气体混合物深入研究了sII（C3H8 + CH4）水合物的置换反应，主要研究了粉末X射线衍射，拉曼光谱，NMR光谱和气相色谱分析。特别地，首先证实了在用CO 2 / N 2气体注入代替C 3 H 8 + CH 4水合物的过程中没有结构转变，表明没有发生sll水合物分解随后形成sI水合物的现象。此外，C3H8 + CH4水合物的笼特定替换模式显示，在sII的小笼中，用N-2替换CH4比在sII的大笼中用CO2替换C3H8更为重要。通过NMR和GC分析对C3H8 + CH4水合物替代物的总含量进行交叉检查，发现大约为54％。与用CO2 / N-2气体替代CH4水合物相比，用CO2 / N-2气体替代C3H8 + CH4水合物的程度较低是由于大笼子中持续存在C3H8且含量较低进料气中N-2的含量。用外部CO2 / N-2气体在C3H8 + CH4水合物中观察到的结构可持续性和特定于笼子的置换将对建议目标天然气水合物储层和理解天然气水合物对安全天然气生产的客体交换的精确性质具有重要意义。和长期的二氧化碳封存。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Applied Energy》 |2016年第15期|579-586|共8页
  • 作者

    Seo Young-ju; Park Seongmin; Kang Hyery; Ahn Yun-Ho; Lim Dongwook; Kim Se-Joon; Lee Jaehyoung; Lee Joo Yong; Ahn Taewoong; Seo Yongwon; Lee Huen;

  • 作者单位

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea|Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Daejeon 305350, South Korea;

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea;

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea;

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea;

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea;

    Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Daejeon 305350, South Korea;

    Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Daejeon 305350, South Korea;

    Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Daejeon 305350, South Korea;

    Korea Inst Geosci & Mineral Resources KIGAM, Petr & Marine Res Div, Daejeon 305350, South Korea;

    Ulsan Natl Inst Sci & Technol UNIST, Sch Urban & Environm Engn, Ulsan 689798, South Korea;

    Korea Adv Inst Sci & Technol KAIST, Dept Chem & Biomol Engn, Daejeon 305701, South Korea;

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

    Replacement; Structural sustainability; sII hydrate; CO2/N-2; Gas hydrate;

    机译：替代;结构可持续性;sII水合物;CO2 / N-2;气体水合物;

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