Sun You-Hong, Bai Feng-Tian, Lü Xiao-Shu, Li Qiang, Liu Yu-Min, Guo Ming-Yi, Guo Wei, Liu Bao-Chang
College of Construction Engineering, Jilin University, Changchun 130021, PR China.
1] College of Construction Engineering, Jilin University, Changchun 130021, PR China [2] Department of Civil and Structural Engineering, School of Engineering, Aalto University, PO Box 12100, FIN-02015 Espoo, Finland.
Sci Rep. 2015 Feb 6;5:8290. doi: 10.1038/srep08290.
This paper proposes a novel energy-efficient oil shale pyrolysis process triggered by a topochemical reaction that can be applied in horizontal oil shale formations. The process starts by feeding preheated air to oil shale to initiate a topochemical reaction and the onset of self-pyrolysis. As the temperature in the virgin oil shale increases (to 250-300°C), the hot air can be replaced by ambient-temperature air, allowing heat to be released by internal topochemical reactions to complete the pyrolysis. The propagation of fronts formed in this process, the temperature evolution, and the reaction mechanism of oil shale pyrolysis in porous media are discussed and compared with those in a traditional oxygen-free process. The results show that the self-pyrolysis of oil shale can be achieved with the proposed method without any need for external heat. The results also verify that fractured oil shale may be more suitable for underground retorting. Moreover, the gas and liquid products from this method were characterised, and a highly instrumented experimental device designed specifically for this process is described. This study can serve as a reference for new ideas on oil shale in situ pyrolysis processes.
本文提出了一种由拓扑化学反应引发的新型节能油页岩热解工艺，该工艺可应用于水平油页岩地层。该工艺首先将预热空气注入油页岩以引发拓扑化学反应并启动自热解。随着原生油页岩温度升高（至250 - 300°C），热空气可被常温空气取代，使内部拓扑化学反应释放热量以完成热解。讨论了此过程中形成的前沿传播、温度演变以及油页岩在多孔介质中的热解反应机理，并与传统无氧工艺进行了比较。结果表明，所提出的方法可实现油页岩的自热解，无需任何外部热量。结果还证实，裂隙油页岩可能更适合地下干馏。此外，对该方法产生的气体和液体产物进行了表征，并描述了专门为此工艺设计的高度仪器化实验装置。本研究可为油页岩原位热解工艺的新思路提供参考。
