An appropriate pyrolysis temperature is required to achieve the best-quality oil and gas products via kerogen pyrolysis for the application of the in situ shale exploitation technology. In this study, the oil and gas products obtained at different pyrolysis temperatures via the oil shale pyrolysis process were analyzed using gas chromatography (GC). The results show that as the pyrolysis temperature increases, the content of hydrocarbon gases first increases and then decreases. Meanwhile, the H2 content in nonhydrocarbon gases gradually increases and reaches 64.07% at 550 °C. In addition, when the pyrolysis temperature is > 400 °C, the content of light components in shale oil rapidly increases. Further, when the pyrolysis temperature exceeds 500 °C, the content of light components in shale oil exceeds 42%. Finally, the H2 content obtained from oil shale pyrolysis by injecting water vapor is approximately eight times higher than that obtained from direct dry distillation. Additionally, the shale oil quality under water vapor action is better than that under direct dry distillation. The kerogen pyrolysis is performed in the H2-rich environment and shale oil is prone to hydrogenation reaction.
1. Yu, X. D., Luo, Z. F., Li, H. B., Gan, D. Q. Effect of vibration on the separation efficiency of oil shale in a compound dry separator. Fuel, 2018, 214, 242‒253.
2. Wang, L., Zhao, Y. S., Yang, D., Kang, Z. Q., Zhao, J. Effect of pyrolysis on oil shale using superheated steam: A case study on the Fushun oil shale, China. Fuel, 2019, 253, 1490‒1498.
3. Wang, L., Yang, D., Zhao, Y. S., Wang, G. Y. Evolution of pore characteristics in oil shale during pyrolysis under convection and conduction heating modes. Oil Shale, 2020, 37(3), 224‒241.
4. Bansal, V. R., Kumar, R., Sastry, M. I. S., Badhe, R. M., Kapur, G. S., Saxena, D. Direct estimation of shale oil potential by the structural insight of Indian origin kerogen. Fuel, 2019, 241, 410‒416.
5. Lai, D. G., Shi, Y., Geng, S. L., Chen, Z. H., Gao, S. Q., Zhan, J.-H., Xu, G. W. Secondary reactions in oil shale pyrolysis by solid heat carrier in a moving bed with internals. Fuel, 2016, 173, 138‒145.
6. Lai, D. G., Zhang, G. Y., Xu, G. W. Characterization of oil shale pyrolysis by solid heat carrier in moving bed with internals. Fuel Process. Technol., 2017, 158, 191‒198.
7. Wang, Q., Zhao, W. Z., Liu, H. P., Jia, C. X., Li, S. H. Interactions and kinetic analysis of oil shale semi-coke with cornstalk during co-combustion. Appl. Energy, 2011, 88(6), 2080‒2087.
8. Na, J. G., Im, C. H., Chung, S. H., Lee, K. B. Effect of oil shale retorting temperature on shale oil yield and properties. Fuel, 2012, 95, 131‒135.
9. Tucker, J. D., Masri, B., Lee, S. G. A comparison of retorting and supercritical extraction techniques on El-Lajjun oil shale. Energ. Source., 2000, 22(5), 453‒463.
10. Razvigorova, M., Budinova, T., Petrova, B., Tsyntsarski, B., Ekinci, E., Ferhat, M. F. Steam pyrolysis of Bulgarian oil shale kerogen. Oil Shale, 2008, 25(1), 27‒37.
11. Lewan, M. D., Birdwell, J. E. Application of uniaxial confining-core clamp with hydrous pyrolysis in petrophysical and geochemical studies of source rocks at various thermal maturities. In: Unconventional Resources Technology Conference, Denver, Colorado, 12–14 August 2013 (Baez, L., Beeney, K., Sonnenberg, S., eds,). Society of Exploration Geophysicists, American Association of Petroleum Geologists, Society of Petroleum Engineers, 2013, 2565‒2572.
12. Sun, Y. H., Yang, Y., Lopatin, V., Guo, W., Liu, B. C., Yu, P., Gao, K., Ma, Y. L. High voltage-power frequency electrical heating in-situ conversion technology of oil shale. In: EGU General Assembly Conference, 27 April – 2 May 2014, Vienna, Austria, 2014, 12707.
13. Zhao, Y. S., Feng, Z. C., Yang, D., Liu, S. Y., Sun, K. M., Zhao, J. Z., Guan, K. W., Duan, K. L. The method for mining oil & gas from oil shale by convection heating. China Invent Patent, CN200510012473. April 20, 2005 (in Chinese).
14. Wang, Y., Gu, M. Y., Zhu, Y. H., Cao, L., Zhu, B. C., Wu, J. J., Lin, Y. Y., Huang, X. Y. A review of the effects of hydrogen, carbon dioxide, and water vapor addition on soot formation in hydrocarbon flames. Int. J. Hydrog. Energy, 2021, 46(61), 31400‒31427.
15. Yang, D., Wang, L., Zhao, Y. S., Kang, Z. Q. Investigating pilot test of oil shale pyrolysis and oil and gas upgrading by water vapor injection. J. Petrol. Sci.Eng., 2021, 196, 108101.
16. Kang, Z. Q., Zhao, Y. S., Yang, D. Physical principle and numerical analysis of oil shale development using in-situ conversion process technology. Acta Petrol. Sin., 2008, 29(4), 592‒595.
17. Geng, Y. D., Liang, W. G., Liu, J., Cao, M. T., Kang, Z. Q. Evolution of pore and fracture structure of oil shale under high temperature and high pressure. Energy Fuels, 2017, 31(10), 10404‒10413.
18. Sun, L. K., Li, S. L., Wu, Y. X., Huang, J. N. Calculation for the low temperature carbonization process with application of Xinjiang oil shale in Fushun furnace. Fuel & Chemical Processes, 2015, 46(3), 3‒6 (in Chinese).
19. Bai, J. R., Lin, W. S., Pan, S., Wang, Q. Characteristics of light gases evolution during oil shale pyrolysis. CIESC Journal, 2015, 66(3), 1104‒1110.
20. Wang, L., Yang, D., Kang, Z. Q. Evolution of permeability and mesostructure of oil shale exposed to high-temperature water vapor. Fuel, 2021, 290, 119786.
21. Yang, Q. C., Qian, Y., Kraslawski, A., Huairong, Z., Yang, S. Advanced exergy analysis of an oil shale retorting process. Appl. Energy, 2016, 165, 405‒415.
22. Tao, S., Tang, D. Z., Li, J. J., Xu, H., Chen, Z. L., Zhou, C. W. Application of step-by-step pyrolysis gas chromatography in evaluating the process property of oil shale. Journal of Xi’an University of Science and Technology, 2010, 30(1), 97‒101 (in Chinese).
23. Cheng, Y., Shi, Y., Wang, Y. G. Comprehensive utilization of Fushun oil shale. Chemistry and Adhesion, 2015, 37(1), 31‒3 (in Chinese).
24. Jiang, X. M., Han, X. X., Cui, Z. G. Progress and recent utilization trends in combustion of Chinese oil shale. Prog. Energy Combust. Sci., 2007, 33(6),552‒579.