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Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE)

Received: 3 September 2021     Accepted: 15 October 2021     Published: 19 October 2021
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Abstract

In order to quantitatively study the metamorphism of coal, by calculating the changes of reflectivity with time and temperature and the changes of temperature with time and reflectivity, the results show that the temperature time reflectivity ternary coal metamorphism thermodynamic equation (Cmte) proposed by Mr. Wu Chonglong is feasible. Although it is only an empirical formula, the mathematical formula is more convenient and accurate than the diagram, The critical temperature of lignite is 49.3°C and that of long flame coal is 56.9°C. The empirical formula of temperature time reflectance is demonstrated to explain the metamorphism of coal. By compiling temperature reflection (time) maps of middle coal formation in Carboniferous, Jurassic and Cretaceous, this paper explains the concept of "the longer the thermal time, the higher the degree of metamorphism" with isothermal horizontal line or equal reflection vertical line. The temperature and effective metamorphic time in the literature of Nantong coalfield in Sichuan further prove the accuracy and practicability of Cmte. The mathematical formula of temperature time reflectance can not only know the cross verification temperature of time and reflectance, but also know the time with a difference of less than 1.4% from the original effective metamorphic time. It is proved that the empirical formula of temperature time reflectance can explain the metamorphism of coal.

Published in International Journal of Economy, Energy and Environment (Volume 6, Issue 5)
DOI 10.11648/j.ijeee.20210605.15
Page(s) 110-113
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2021. Published by Science Publishing Group

Keywords

Coal Metamorphism Thermodynamics Equation, Temperature-time-reflectivity, Long Flame Coal

References
[1] Coal degree classification of vitrinite reflectance. Coal industry standards. MT/T 1158-2011.
[2] Chen Qingru, Liu jiongtian. China clean coal [M]. Xuzhou, China University of mining and Technology Press, 2009.
[3] Wu Chonglong, Yang Qi, Liu Gang, et. al., Principles and methods of thermodynamics for analysis of coal metamorphism [J]. Journal of China Coal Society, 1997, 22 (3): 225-229.
[4] Yang Qi. A study on coal metamorphism in China [J]. Earth Science-Journal of China University of Geosciences, 1989, 14 (4): 341-345.
[5] Yang Qi. Superimposed metamorphism of Chinese coal [J]. Earth Science-Journal of China University of Geosciences, 1999, 6 (z1): 1-8.
[6] Yang Qi, Wu Chonglong, Tang Dazhen, et al. Coal metamorphism in China [J]. Earth Science-Journal of China University of Geosciences, 1996, 21 (3): 311-319.
[7] Hood A, Gutjahr C C M, Heacock R H. Organic metamorphism and the generation of petroleum [J]. Bull. AAPG, 1975, 59 (6): 986-996.
[8] Bostick N H, Cashman S M, McCulloh T H, et al. Gradients of vitrinite reflectance and present temperature in the Los Angeles and Ventura Basins, California. In: Oltz D F, ed. Low temperature metamorphism of kerogen and clay minerals. Los Angeles: Pacific Section, SEPM (Society for Sedimentary Geology), 1979, 65-96.
[9] Method of determining microscopically the reflectance of vitrinite in coal. GB/T 6948-2008.
[10] Li Wenhua, Bai Xiangfei, Yang Jinhe, et al. Correspondence between mean maximum reflectance of Vitrinite and classification of bituminous coals [J]. Journal of China Coal Society, 2006, 31 (3): 342-345.
[11] Classification of coalification degree by vitrinite reflectance. MT/T 1158-2011.
[12] Hu Zhongya. Analysis of the effects of temperature, time and pressure on metamorphism [J]. Silicon Valley, 2010, (08): 4.
[13] Zhang Shuangquan. Coal chemistry [M]. China University of Mining and Technology Press. 2015.
[14] Tan Yongjie. A study on the paleogeothermal field temperature recovery method of coal metamorphism [J]. Coal Geology & Exploration, 1989, (2): 30-36.
[15] Huang Kexing, Tan Yongjie. Paleogeothermal field of coal metamorphism in Nantong coalfield Sichuan province [J]. Journal of China Coal Society, 1990, 15 (4): 54-62.
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    Ma Qinghua, Zhang Xuemei, Li Dong, Hao Jingyuan. (2021). Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE). International Journal of Economy, Energy and Environment, 6(5), 110-113. https://doi.org/10.11648/j.ijeee.20210605.15

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    ACS Style

    Ma Qinghua; Zhang Xuemei; Li Dong; Hao Jingyuan. Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE). Int. J. Econ. Energy Environ. 2021, 6(5), 110-113. doi: 10.11648/j.ijeee.20210605.15

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    AMA Style

    Ma Qinghua, Zhang Xuemei, Li Dong, Hao Jingyuan. Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE). Int J Econ Energy Environ. 2021;6(5):110-113. doi: 10.11648/j.ijeee.20210605.15

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  • @article{10.11648/j.ijeee.20210605.15,
      author = {Ma Qinghua and Zhang Xuemei and Li Dong and Hao Jingyuan},
      title = {Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE)},
      journal = {International Journal of Economy, Energy and Environment},
      volume = {6},
      number = {5},
      pages = {110-113},
      doi = {10.11648/j.ijeee.20210605.15},
      url = {https://doi.org/10.11648/j.ijeee.20210605.15},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijeee.20210605.15},
      abstract = {In order to quantitatively study the metamorphism of coal, by calculating the changes of reflectivity with time and temperature and the changes of temperature with time and reflectivity, the results show that the temperature time reflectivity ternary coal metamorphism thermodynamic equation (Cmte) proposed by Mr. Wu Chonglong is feasible. Although it is only an empirical formula, the mathematical formula is more convenient and accurate than the diagram, The critical temperature of lignite is 49.3°C and that of long flame coal is 56.9°C. The empirical formula of temperature time reflectance is demonstrated to explain the metamorphism of coal. By compiling temperature reflection (time) maps of middle coal formation in Carboniferous, Jurassic and Cretaceous, this paper explains the concept of "the longer the thermal time, the higher the degree of metamorphism" with isothermal horizontal line or equal reflection vertical line. The temperature and effective metamorphic time in the literature of Nantong coalfield in Sichuan further prove the accuracy and practicability of Cmte. The mathematical formula of temperature time reflectance can not only know the cross verification temperature of time and reflectance, but also know the time with a difference of less than 1.4% from the original effective metamorphic time. It is proved that the empirical formula of temperature time reflectance can explain the metamorphism of coal.},
     year = {2021}
    }
    

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  • TY  - JOUR
    T1  - Numerical Evaluation of the Coal Metamorphism Thermodynamics Equation (CMTE)
    AU  - Ma Qinghua
    AU  - Zhang Xuemei
    AU  - Li Dong
    AU  - Hao Jingyuan
    Y1  - 2021/10/19
    PY  - 2021
    N1  - https://doi.org/10.11648/j.ijeee.20210605.15
    DO  - 10.11648/j.ijeee.20210605.15
    T2  - International Journal of Economy, Energy and Environment
    JF  - International Journal of Economy, Energy and Environment
    JO  - International Journal of Economy, Energy and Environment
    SP  - 110
    EP  - 113
    PB  - Science Publishing Group
    SN  - 2575-5021
    UR  - https://doi.org/10.11648/j.ijeee.20210605.15
    AB  - In order to quantitatively study the metamorphism of coal, by calculating the changes of reflectivity with time and temperature and the changes of temperature with time and reflectivity, the results show that the temperature time reflectivity ternary coal metamorphism thermodynamic equation (Cmte) proposed by Mr. Wu Chonglong is feasible. Although it is only an empirical formula, the mathematical formula is more convenient and accurate than the diagram, The critical temperature of lignite is 49.3°C and that of long flame coal is 56.9°C. The empirical formula of temperature time reflectance is demonstrated to explain the metamorphism of coal. By compiling temperature reflection (time) maps of middle coal formation in Carboniferous, Jurassic and Cretaceous, this paper explains the concept of "the longer the thermal time, the higher the degree of metamorphism" with isothermal horizontal line or equal reflection vertical line. The temperature and effective metamorphic time in the literature of Nantong coalfield in Sichuan further prove the accuracy and practicability of Cmte. The mathematical formula of temperature time reflectance can not only know the cross verification temperature of time and reflectance, but also know the time with a difference of less than 1.4% from the original effective metamorphic time. It is proved that the empirical formula of temperature time reflectance can explain the metamorphism of coal.
    VL  - 6
    IS  - 5
    ER  - 

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Author Information
  • Energy & Chemical Engineering Research Center, Xi'an Siyuan University, Xi’an, China

  • Energy & Chemical Engineering Research Center, Xi'an Siyuan University, Xi’an, China

  • Energy & Chemical Engineering Research Center, Xi'an Siyuan University, Xi’an, China

  • Energy & Chemical Engineering Research Center, Xi'an Siyuan University, Xi’an, China

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