Effect of long reaction distance on gas composition from organic-rich shale pyrolysis under high-temperature steam environment

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-04-28 DOI:10.1007/s40789-024-00689-7
Lei Wang, Rui Zhang, Guoying Wang, Jing Zhao, Dong Yang, Zhiqin Kang, Yangsheng Zhao
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Abstract

When high-temperature steam is used as a medium to pyrolyze organic-rich shale, water steam not only acts as heat transfer but also participates in the chemical reaction of organic matter pyrolysis, thus affecting the generation law and release characteristics of gas products. In this study, based on a long-distance reaction system of organic-rich shale pyrolysis via steam injection, the effects of steam temperature and reaction distance on gas product composition are analyzed in depth and compared with other pyrolysis processes. The advantages of organic-rich shale pyrolysis via steam injection are then evaluated. The volume concentration of hydrogen in the gas product obtained via the steam injection pyrolysis of organic-rich shale is the highest, which is more than 60%. The hydrogen content increases as the reaction distance is extended; however, the rate of increase changes gradually. Increasing the reaction distance from 800 to 4000 mm increases the hydrogen content from 34.91% to 69.68% and from 63.13% to 78.61% when the steam temperature is 500 °C and 555 °C, respectively. However, the higher the heat injection temperature, the smaller the reaction distance required to form a high concentration hydrogen pyrolysis environment (hydrogen concentration > 60%). When the steam pyrolysis temperature is increased from 500 °C to 555 °C, the reaction distance required to form a high concentration of hydrogen is reduced from 3800 to 800 mm. Compared with the direct retorting process, the volume concentration of hydrogen obtained from high-temperature steam pyrolysis of organic-rich shale is 8.82 and 10.72 times that of the commonly used Fushun and Kivite furnaces, respectively. The pyrolysis of organic-rich shale via steam injection is a pyrolysis process in a hydrogen-rich environment.

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高温蒸汽环境下长反应距离对富有机页岩热解产生的气体成分的影响
以高温蒸汽为介质热解富含有机质的页岩时,水蒸汽不仅起传热作用,还参与有机物热解的化学反应,从而影响气体产物的生成规律和释放特性。本研究以注入蒸汽热解富含有机质页岩的长距离反应系统为基础,深入分析了蒸汽温度和反应距离对气体产物组成的影响,并与其他热解工艺进行了比较。然后评估了通过蒸汽喷射热解富含有机质页岩的优势。通过蒸汽喷射热解富有机页岩得到的气体产物中氢的体积浓度最高,超过 60%。氢含量随着反应距离的延长而增加,但增加的速度是逐渐变化的。当蒸汽温度为 500 °C 和 555 °C 时,反应距离从 800 mm 增加到 4000 mm,氢含量分别从 34.91% 和 63.13% 增加到 69.68% 和 78.61%。然而,注热温度越高,形成高浓度氢热解环境(氢浓度为 60%)所需的反应距离就越小。当蒸汽热解温度从 500 °C 提高到 555 °C 时,形成高浓度氢气所需的反应距离从 3800 mm 减小到 800 mm。与直接蒸馏工艺相比,富含有机质页岩高温蒸汽热解得到的氢气体积浓度分别是常用的抚顺炉和基维特炉的 8.82 倍和 10.72 倍。通过蒸汽喷射热解富有机页岩是在富氢环境下的热解过程。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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