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Cao R, Yang D, Kang Z, Huang D, Cui Z, Lu Y. Effects of Inherent Minerals on Pyrolysis Behavior and Kinetics of Jimsar Oil Shale. ACS OMEGA 2023; 8:40396-40406. [PMID: 37929161 PMCID: PMC10620913 DOI: 10.1021/acsomega.3c04780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 09/22/2023] [Indexed: 11/07/2023]
Abstract
In order to reveal the influences of different inherent minerals on the pyrolysis behavior and kinetics of oil shale, decarburization, and desilication, samples were obtained by pickling and demineralization. The influence of inherent minerals on the activation energy of oil shale at different conversion rates and the pyrolysis kinetic model were researched by the equal conversion method and principal curve method. The results demonstrated that the average and maximum weight loss rates and volatile release characteristic index of JM-C were lower than that of JM-R; however, JM-S appeared with the opposite trend. At the initial stage (α = 0.2-0.6), the pyrolysis activation energy of JM-C was basically the same as that of JM-R, while the pyrolysis activation energy of JM-S decreased. At the later stage (α = 0.6-0.8), the pyrolysis activation energy of JM-C was higher than that of JM-R, while the activation energy of JM-S was between JM-C and JM-R. The existence of inherent carbonates reduced the pyrolysis activation energy of oil shale, but only at the later stage of pyrolysis. In addition, the existence of inherent carbonates changed the pyrolysis kinetic model of oil shale from an order model to a one-dimensional diffusion model, encompassing f(α) = (1 - α)2.5 and f(α) = 0.5α-1. However, the existence of inherent silicates increased the activation energy of oil shale pyrolysis. Moreover, its mechanism was consistent with the original model, namely, an order model, f(α) = 1 - α.
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Affiliation(s)
- Ran Cao
- Key
Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
- The
In-situ Steam Injection Branch of State Center for Research and Development
of Oil Shale Exploitation, Taiyuan University
of Technology, Taiyuan 030024, P. R. China
| | - Dong Yang
- Key
Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
- The
In-situ Steam Injection Branch of State Center for Research and Development
of Oil Shale Exploitation, Taiyuan University
of Technology, Taiyuan 030024, P. R. China
| | - Zhiqin Kang
- Key
Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
- The
In-situ Steam Injection Branch of State Center for Research and Development
of Oil Shale Exploitation, Taiyuan University
of Technology, Taiyuan 030024, P. R. China
| | - Dongwei Huang
- Key
Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
- The
In-situ Steam Injection Branch of State Center for Research and Development
of Oil Shale Exploitation, Taiyuan University
of Technology, Taiyuan 030024, P. R. China
| | - Zhenni Cui
- State
Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Shanxi 030024, China
| | - Yang Lu
- Key
Lab of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, P. R. China
- The
In-situ Steam Injection Branch of State Center for Research and Development
of Oil Shale Exploitation, Taiyuan University
of Technology, Taiyuan 030024, P. R. China
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