eesti teaduste
akadeemia kirjastus
SINCE 1984
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2020): 0.934


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This paper presents a new mathematical model of the heat transfer characteristics for oil shale particles during the retorting. In this process, the heat transfer within oil shale particles affects shale oil yield and energy consumption. To explore the heat transfer characteristics of oil shale particles in more detail, experiments on its thermal conductivity were con­ducted to confirm that oil shale was an anisotropic material. The results showed that the thermal conductivity in the parallel direction was about 1.25 times higher than that in the perpendicular direction. The dimensions of crushed oil shale particles were measured, and the ratios of length to width, length to thickness and width to thickness showed that the oil shale particles had a clear platy structure. Based on the experimental results, a new mathematical model, which considered the pyrolytic heat as an internal heat sink, was developed. It was validated that the model could be used to predict the central tem­perature history and heating time of oil shale particles during the retorting. Furthermore, the central temperature history and heating time of oil shale particles with different sizes were predicted, assuming oil shale to be either an isotropic or anisotropic material. The results showed that when oil shale was regarded as an isotropic material, there was a relatively marked disagree­ment between experimental and actual results. In addition, the relationship between the heating time and oil shale particle equivalent diameter was established.


1.       Taciuk, W. Does oil shale have a significant future? Oil Shale, 2013, 30(1), 1–5.

2.       Sun, Y. H., Bai, F. T., Liu, B. C., Liu, Y. M., Guo, M. G., Guo, W., Wang, Q. W., Lü, X. S., Yang, F., Yang, Y. Characterization of the oil shale products derived via topochemical reaction method. Fuel, 2014, 115, 338–346.

3.       Akar, A., Ekinci, E. Production of chemicals from oil shales. Fuel, 1995, 74(8), 1113–1117.

4.       Altun, N. E., Hiçyilmaz, C., Hwang, J. Y., Suat Bağci, A., Kök, M. V. Oil shales in the world and Turkey; reserves, current situation and future prospects: a review. Oil Shale, 2006, 23(3), 211–227.

5.       Liu, Z. J., Dong, Q. S., Ye, S. Q., Zhu, J. W., Guo, W., Li, D. C., Liu, R., Zhang, H. L., Du, J. F. The situation of oil shale resources in China. Journal of Jilin University (Earth Science Edition), 2006, 36(6), 869–876 (in Chinese, with English abstract).

6.       Qian, J. L., Wang, J. Q., Li, S. Y. World’s oil shale available retorting techno­logies and the forecast of shale oil production. In: Proceedings of the Eighteenth International Offshore and Polar Engineering Conference (Chung, J. S., ed.). Vancouver, Canada, 2008, 19.

7.       Kök, M. V., Guner, G., Bagci, S. Application of EOR techniques for oil shale fields (in-situ combustion approach). Oil Shale, 2008, 25(2), 217–225.

8.       Kok, M. V., Bagci, S. An investigation of the applicability of the in-situ thermal recovery technique to the Beypazari oil shale. Energ. Source. Part A, 2010, 33(3), 183–193.

9.       Kök, M. V., Guner, G., Bagci, S. Combustion kinetics of oil shales by reaction cell experiments. Oil Shale, 2008, 25(1), 5–16.

10.    Pan, L. W., Dai, F. Q., Li, G. Q., Liu, S. A TGA/DTA-MS investigation to the influence of process conditions on the pyrolysis of Jimsar oil shale. Energy, 2015, 86, 749–757.

11.    Khraisha, Y. H. Kinetics of isothermal pyrolysis of Jordan oil shales. Energ. Convers. Manage., 1998, 39(3–4), 157–165.

12.    Bai, F. T., Sun, Y. H., Liu, Y. M., Li, Q., Guo, M. G. Thermal and kinetic charac­teristics of pyrolysis and combustion of three oil shales. Energ. Convers. Manage., 2015, 97, 374–381.

13.    Zhang, J. K., Li, B. W., Hu, Z. M. Effects of optical parameters on fluid flow and heat transfer of participating magnetic fluid. Int. J. Heat Mass Tran., 2013, 59, 126–136.

14.    Kök, M. V., Pamir, R. Pyrolysis kinetics of oil shales determined by DSC and TG/DTG. Oil Shale, 2003, 20(1), 57–68.

15.    Braun, R. L., Rothman, A. J. Oil-shale pyrolysis: Kinetics and mechanism of oil production. Fuel, 1975, 54(2), 129–131.

16.    Granoff, B., Nuttall Jr, H. E. Pyrolysis kinetics for oil-shale particles. Fuel, 1977, 56(3), 234–240.

17.    Shih, S.-M., Sohn, H. Y. A mathematical model for the retorting of a large block of oil shale: effect of the internal temperature gradient. Fuel, 1978, 57(10), 622–630.

18.    Pan, Z. L., Feng, H. Y., Smith, J. M. Rates of pyrolysis of Colorado oil shale. AIChE J., 1985, 31(5), 721–728.

19.    Han, X. X., Liu, Q. Q., Jiang, X. M. Heat transfer characteristic of oil shale particle during the retorting. Int. J. Heat Mass Tran., 2015, 84, 578–583.

20.    Wang, Q., Sun, B. Z., Wu, X. H., Bai, J. R., Sun, J. Analysis of combustion reaction activation of oil shale semi-coke. Chemical Engineering (China), 2006, 34(11), 16–19 (in Chinese, with English abstract).

21.    Qian, J. L., Li, S. Y., Guo, S. H., Ding, F. C. Oil Shale Retorting Process. China Petrochemical Press, Beijing, 2014 (in Chinese).

22.    Bai, F. T., Guo, W., Lü, X. S., Liu, Y. M., Guo, M. G., Li, Q., Sun, Y. H. Kinetic study on the pyrolysis behavior of Huadian oil shale via non-isothermal thermogravimetric data. Fuel, 2015, 146, 111–118.

23.    Li, S. Y., Yue, C. T. Study of pyrolysis kinetics of oil shale. Fuel, 2003, 82(3), 337–342.

24.    Wang, W., Li, S. Y., Li, L. Y., Ma, Y., Yue, C. T., He, J. L. Pyrolysis kinetics of North-Korean oil shale. Oil Shale, 2014, 31(3), 250–265.

25.    Cheng, Y., Li, T. Y., Yan, B. H., Chen, Y. Particle-scale modeling of asphaltene pyrolysis in thermal plasma. Fuel, 2016, 175, 294–301.

26.    Zhang, Y. Q., Zhu, J. L., Wang, X. H., Zhang, X. W., Zhou, S. X., Liang, P. Simulation of large coal particles pyrolysis by circulating ash heat carrier toward the axial dimension of the moving bed. Fuel Process. Technol., 2016, 154, 227–234.

27.    Wang, T. F., Lu, S. X., Zhu, Y. J. Study on the properties of oil shale in China. Journal of Fuel Chemistry and Technology, 1987, 15(4), 311–316 (in Chinese, with English abstract).

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