Zhao Shuai, Lü Xiaoshu, Sun Youhong, Huang Jiandong
School of Mines, China University of Mining and Technology, XuZhou, 221116, China.
Construction Engineering College of JiLin University, ChangChun, 130000, China.
Sci Rep. 2021 Mar 8;11(1):5365. doi: 10.1038/s41598-021-84757-x.
Topochemical heat in-situ pyrolysis of oil shale is achieved by injecting high temperature nitrogen to promote oil shale pyrolysis and release heat, and then injecting air to trigger oil shale combustion in the early stage of oil shale pyrolysis, and then by injecting normal temperature air continuously to promote local oxidation of oil shale in the later stage. In order to verify the oil and gas recovery by topochemical heat method, Jilin University has chosen Fuyu City, Jilin Province, to carry out pilot project of oil shale in-situ pyrolysis by topochemical heat method. Besides, in order to infer the spontaneity, feasibility and difficulty of continuous pyrolysis of oil shale based on topochemical heat, this paper, the mechanism of solid-state pyrolysis and the thermodynamic analysis of transition state of oil shale in Fuyu area are discussed. Because the second stage of oil shale pyrolysis is the main stage of oil production. Therefore, the characteristics of Gibbs free energy, free enthalpy and free entropy of transition state in the main oil production stage of oil shale pyrolysis are obtained by calculation. The results show that in situ pyrolysis of oil shale topochemical heat can be carried out spontaneously and continuously, and the release characteristics of volatiles during pyrolysis of oil shale are described.
油页岩的拓扑化学热原位热解是通过注入高温氮气促进油页岩热解并释放热量，然后在油页岩热解初期注入空气引发油页岩燃烧，随后在后期持续注入常温空气促进油页岩局部氧化来实现的。为了验证拓扑化学热法对油气的采收效果，吉林大学选择吉林省扶余市开展油页岩拓扑化学热原位热解试验工程。此外，为了推断基于拓扑化学热的油页岩连续热解的自发性、可行性和难度，本文探讨了扶余地区油页岩固态热解机理及过渡态热力学分析。由于油页岩热解的第二阶段是产油的主要阶段。因此，通过计算得出了油页岩热解主要产油阶段过渡态的吉布斯自由能、自由焓和自由熵特征。结果表明，油页岩拓扑化学热原位热解能够自发且连续地进行，并描述了油页岩热解过程中挥发分的释放特征。
