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天然气水合物分解过程中重整特性的研究

原文信息:

Hydrate reformation characteristics in natural gas hydrate dissociation process: A review

原文链接:

https://www.sciencedirect.com/science/article/pii/S030626191931565X



01

Highlights

  • Hydrate reformation during exploitation is caused mainly by insufficient heat supply. 
  • Hydrate reformation is likely to occur in the depressurization process.

  • The depressurization process should be combined with thermal stimulation.

  • A new system is designed to investigate hydrate reformation under various conditions


02摘要

天然气水合物被认为是最有前途的能量来源之一。但是,目前在海洋中水合物的开采在经济,安全和商业水平上尚未达到理想程度。主要障碍之一是水合物开采过程中的水合物重整现象,而这需要适当地解决。本文讨论了在减压和热激发状态下水合物的分离和重整过程,还有必要去了解分离过程中各种因素影响水合物重整的方式。因此,着重分析了关键因素对热激发和降压分离过程中水合物重整的影响,从而为水合物重整机理提供了全面的解释。此外,讨论了在开采过程中用于防止水合物重整的几种措施。最后,设计了一个实验系统来研究各种水合物沉积物的开采方法和优化方法。未来的工作应集中在寻找有效的方法和评估其组合技术,并用于保证较高开采效率的同时防止水合物重整。

相关介绍

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Natural gas hydrate (CH4·5.75H2O) or (4CH4·23H2O), also called methane clathrate, is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar to ice. Originally thought to occur only in the outer regions of the Solar System, where temperatures are low and water ice is common, significant deposits of methane clathrate have been found under sediments on the ocean floors of the Earth. (Source: Wikipedia)


03

Abstract

Natural gas hydrates are considered as some of the most promising energy sources. However, economical, safe, and commercial exploitation of marine hydrates has not yet been achieved. One of the main obstacles is hydrate reformation in the process of hydrate exploitation, which needs to be properly addressed. The processes of hydrate dissociation and reformation under depressurization and thermal stimulation are discussed in this review. It is necessary to understand the manner in which various factors affect hydrate reformation during dissociation. Therefore, the effects of critical factors on hydrate reformation during thermal stimulation and depressurization dissociation are analysed to provide a comprehensive explanation of the hydrate reformation mechanism. In addition, several measures used to prevent hydrate reformation during the exploitation process are discussed. Finally, an experimental system was designed to investigate the exploitation methods and optimization of various hydrate-bearing sediments. Future efforts should focus on finding effective methods and evaluating the combined sequences, which can prevent hydrate reformation with acceptable exploitation efficiency.


Keywords:

Gas hydrate exploitation

Hydrate reformation

Thermal stimulation

Depressurization 

Inhibitor



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Fig. 1. Schematic diagram of methane hydrate phase equilibrium


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Fig. 2. Schematic diagram of hydrate dissociation process under thermal stimulation (modified from Jamaluddin et al. [44]).


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Fig. 3. Schematic diagram of the hydrate dissociation process under depressurization (modified from Hong [52]).