Abstract The co-current oxidizing pyrolysis behavior of Huadian oil shale with pure oxygen at low temperature was demonstrated in this study for the first time. The characteristics of semi-coke and shale oil obtained under various pyrolysis parameters have been investigated to further clarify the mechanism of co-current oxidizing pyrolysis of oil shale. The results show that high oil recovery of 16.76 % (about 90 % compared to Fischer assay result of 18.31 %) can be achieved at 370 °C in oxidizing atmosphere. The amount of residual carbon in semi-coke was decreased by weight of 4.34 %, 6.84 % and 6.95 % at 300 °C, 350 °C and 370 °C, respectively, compared with that obtained at 520 °C in an inert atmosphere, which indicates the majority of residual carbon, rather than shale oil and shale gas, was involved in the oxidation reaction. The DSC results were an additional indication of the importance of the the oxidizing exothermic reaction of residual carbon in semi-coke, which promoted organic matter conversion at low temperatures and indicated the possibility of low-energy-consumption and therefore sustainable conversion of oil shale. Furthermore, the light fraction in the shale oil obtained in oxidizing conditions is higher than that in an inert atmosphere, which indicates oxidizing pyrolysis of oil shale can improve the quality of shale oil for further application. It is suggested that the low temperature co-current oxidizing pyrolysis could shed light on the development of a highly effective in-situ extraction strategy of oil shale.

中文翻译：

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华甸油页岩低温顺流氧化热解特性

摘要 本研究首次论证了华甸油页岩与纯氧在低温下的顺流氧化热解行为。研究了不同热解参数下得到的半焦和页岩油的特性，进一步阐明了油页岩并流氧化热解的机理。结果表明，在 370 °C 的氧化气氛中可以实现 16.76 % 的高油采收率（与 Fischer 分析结果的 18.31 % 相比约为 90 %）。与在惰性气氛中 520°C 获得的相比，在 300°C、350°C 和 370°C 下半焦中的残留碳量分别减少了 4.34%、6.84% 和 6.95% 的重量，这表明大部分残留碳，而不是页岩油和页岩气，参与了氧化反应。DSC 结果进一步表明了半焦中残留碳的氧化放热反应的重要性，该反应促进了低温下的有机物转化，并表明了低能耗和油页岩可持续转化的可能性。此外，在氧化条件下获得的页岩油中轻馏分高于惰性气氛下，这表明油页岩氧化热解可以提高页岩油的质量以供进一步应用。这表明低温并流氧化热解可以为开发一种高效的油页岩原位提取策略提供启示。这促进了低温下的有机质转化，表明油页岩的低能耗和可持续转化的可能性。此外，氧化条件下获得的页岩油中轻馏分高于惰性气氛下，这表明油页岩氧化热解可以提高页岩油的质量以供进一步应用。这表明低温并流氧化热解可以为开发一种高效的油页岩原位提取策略提供启示。这促进了低温下的有机质转化，表明油页岩的低能耗和可持续转化的可能性。此外，氧化条件下获得的页岩油中轻馏分高于惰性气氛下，这表明油页岩氧化热解可以提高页岩油的质量以供进一步应用。这表明低温并流氧化热解可以为开发一种高效的油页岩原位提取策略提供启示。这表明油页岩氧化热解可以提高页岩油的质量以进一步应用。这表明低温并流氧化热解可以为开发一种高效的油页岩原位提取策略提供启示。这表明油页岩氧化热解可以提高页岩油的质量以进一步应用。这表明低温并流氧化热解可以为开发一种高效的油页岩原位提取策略提供启示。