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Thermophysical properties of coal measure strata under high temperature

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Abstract

Thermophysical properties (such as specific heat capacity, thermal conductivity, and thermal diffusivity) of coal measure strata at a wide range of temperatures are important to coal in situ gasification with environmental treatments. These thermophysical properties have been investigated for different rocks but few are available for the rocks from coal measure strata. This study experimentally investigated the specific heat capacity and the thermal conductivity of six types of rock samples from coal measure strata, including sandy mudstone 1 and 2, mudstone, siltstone, coarse sandstone, and fine sandstone when the testing temperature varies from 100 to 1000 °C. Two critical temperatures, 500 °C for sandy mudstone 1 and 400 °C for the other five types of rock samples, were observed. The test results show that both the specific heat capacity and the thermal conductivity decrease with the increase of temperature when the testing temperature is below the critical temperature. When the testing temperature is over the critical temperature, the specific heat capacity is almost constant and the thermal conductivity still continues decreasing. These test results further show that the classical physics theory can well predict the experimental data for both specific heat capacity and thermal conductivity of six rocks.

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Acknowledgments

The authors would like to thank Dr Yang Ju, Dr. Xianbiao Mao, and Dr Ruidong Peng for their valuable time, help and suggestions. The financial supports of the National Natural Science Foundation of China (Grant No. 51204159), the National Basic Research Program of China (Grant No. 2011CB201201), the National Science Fund for Distinguished Young Scholars (Grant No. 51125017), the National Natural Science Foundation of China (Grant No. 51104128) and the Fundamental Research Funds for the Central Universities (Grant No. 2011QNB05) are gratefully acknowledged.

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Authors and Affiliations

  1. School of Sciences, China University of Mining and Technology, Xuzhou, 221116, China

    Furong Tang & Xianqing Yang

  2. State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China

    Furong Tang, Lianguo Wang & Yinlong Lu

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  1. Furong Tang
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  2. Lianguo Wang
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Correspondence to Furong Tang.

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Tang, F., Wang, L., Lu, Y. et al. Thermophysical properties of coal measure strata under high temperature. Environ Earth Sci 73, 6009–6018 (2015). https://doi.org/10.1007/s12665-015-4364-0

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