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Underground in situ coal thermal treatment for synthetic fuels production
Progress in Energy and Combustion Science ( IF 29.5 ) Pub Date : 2017-09-01 , DOI: 10.1016/j.pecs.2017.05.003
Hongzhi R. Zhang , Suhui Li , Kerry E. Kelly , Eric G. Eddings

Abstract Underground coal thermal treatment (UCTT) is a promising concept that was recently proposed for extracting high-value hydrocarbon fuels from deep coal seams, which are economically unattractive for mining. UCTT is essentially an in situ pyrolysis process that converts underground coals into synthetic liquid and gaseous fuels, while leaving most of the carbon underground as a char matrix. The produced synthetic fuels have higher H/C ratios than coals. The remaining char matrix is an ideal reservoir for CO 2 sequestration because pyrolysis significantly increases the surface area of the char. The UCTT concept is relatively new, and there is little research in this area. However, underground oil shale retorting, which is also an in-situ hydrocarbon fuels conversion process, shares key features with UCTT and has gained momentum in demonstration and commercial development. As such, there is a large body of literature available in this area. A review of the studies on underground oil shale retorting that are closely related to UCTT will shed light on the UCTT process. This paper presents a review of the recent literature on underground oil shale retorting that are most relevant to UCTT process. The review provides a background to the reader by comparing the properties of coal with oil shale, with an emphasis on the feasibility of applying oil shale retorting techniques to UCTT process. The review further discusses the coal and oil shale conversion issues and uses the knowledge of the latter as guidance for the development of UCTT. Published data on pyrolysis of large coal blocks at conditions relevant to UCTT process is scarce. Therefore, literature on conventional coal pyrolysis is reviewed for optimization of the UCTT process. Despite the abundant studies on pulverized coal pyrolysis, there are still many open questions on whether they can be directly applied to UCTT. A comparison of the unique environment of UCTT with conditions of conventional pulverized coal pyrolysis clearly shows there are knowledge gaps. Future research needs are then proposed to close these gaps.

中文翻译:

用于合成燃料生产的地下原位煤热处理

摘要 地下煤热处理(UCTT)是一个很有前景的概念,最近被提出用于从深部煤层中提取高价值的碳氢燃料,这些燃料在经济上对采矿没有吸引力。UCTT 本质上是一种原位热解过程,将地下煤转化为合成液体和气体燃料,同时将大部分碳作为炭基质留在地下。生产的合成燃料比煤具有更高的 H/C 比。剩余的炭基质是 CO 2 封存的理想储层,因为热解显着增加了炭的表面积。UCTT的概念比较新,这方面的研究很少。然而,地下油页岩干馏也是一种就地碳氢燃料转化过程,与UCTT共享主要功能,并在示范和商业发展方面获得了动力。因此,该领域有大量文献可供参考。对与 UCTT 密切相关的地下油页岩干馏研究的回顾将阐明 UCTT 过程。本文回顾了与 UCTT 工艺最相关的地下油页岩干馏的最新文献。该评论通过比较煤与油页岩的特性为读者提供了背景,重点介绍了将油页岩干馏技术应用于 UCTT 工艺的可行性。该评论进一步讨论了煤和油页岩转化问题,并使用后者的知识作为指导 UCTT 的发展。在与 UCTT 工艺相关的条件下,关于大煤块热解的已发表数据很少。因此,对常规煤热解的文献进行了审查,以优化 UCTT 工艺。尽管对煤粉热解进行了大量研究,但它们是否可以直接应用于 UCTT 仍然存在许多悬而未决的问题。UCTT 独特的环境与常规煤粉热解条件的比较清楚地表明存在知识差距。然后提出未来的研究需求以弥补这些差距。UCTT 独特的环境与常规煤粉热解条件的比较清楚地表明存在知识差距。然后提出未来的研究需求以弥补这些差距。UCTT 独特的环境与常规煤粉热解条件的比较清楚地表明存在知识差距。然后提出未来的研究需求以弥补这些差距。
更新日期:2017-09-01
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