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Experimental Research on the Law of Energy Conversion during CO 2 Sequestration in Coal

Author

Listed:
  • Tao Gao

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China)

  • Cunbao Deng

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China)

  • Qing Han

    (College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong 030600, China)

Abstract

CO 2 sequestration in coal is mainly attributed to adsorption. The adsorption experiments of CO 2 were conducted at injection pressures ranging from 1 to 3 MPa on coal samples with five kinds of particle sizes. The fitting degree of four classical adsorption models to experimental adsorption data was systematically compared. The adsorption properties of CO 2 were comprehensively discussed. The temperature changes of coal samples at different positions during CO 2 adsorption were measured by using the improved adsorption tank, and then the energy conversion law was obtained. The results showed increasing gas injection pressure can effectively increase the adsorption capacity of CO 2 on coal samples. The BET equation had the best fitting accuracy for CO 2 adsorption on various size coal samples. There was a significant exothermic effect during CO 2 adsorption and storage. With the rise of injection pressure, the peak value of the rising temperature of coal samples increased, but the change rate decreased. The maximum temperature rise of coal samples was up to 13.6 °C at 3 MPa, which should be of great concern for the prevention of coal spontaneous combustion. During the sequestration process of CO 2 , the adsorption resulted in a decrease in coal surface free energy and then partial conversion to heat, leading to the rise of coal temperature. In addition, the CO 2 adsorption on the pore surface caused the expansion and deformation of coal.

Suggested Citation

  • Tao Gao & Cunbao Deng & Qing Han, 2021. "Experimental Research on the Law of Energy Conversion during CO 2 Sequestration in Coal," Energies, MDPI, vol. 14(23), pages 1-12, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:23:p:8079-:d:693866
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    References listed on IDEAS

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    1. Perera, M.S.A. & Ranjith, P.G. & Viete, D.R., 2013. "Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin," Applied Energy, Elsevier, vol. 110(C), pages 73-81.
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    1. Fei Gao & Peng Wang & Dapeng Wang & Yulong Yang & Xun Zhang & Gang Bai, 2023. "Model for Predicting CO 2 Adsorption in Coal Left in Goaf Based on Backpropagation Neural Network," Energies, MDPI, vol. 16(9), pages 1-16, April.

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