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A new method for exploiting mine geothermal energy by using functional cemented paste backfill material for phase change heat storage: design and experimental study

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  • Additional Information
    • Contributors:
      Universitat Politècnica de Catalunya. Doctorat en Enginyeria del Terreny; Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental; Centre Internacional de Mètodes Numèrics en Enginyeria; Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques
    • Publication Information:
      Elsevier
    • Publication Date:
      2022
    • Collection:
      Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
    • Abstract:
      The research on mine geothermal energy exploitation has attracted global interest for many years. This paper proposes an innovative new method for geothermal-coal synergetic mining (GE-COSM) to expand the valorization of coal-based solid waste (C-BSW), reduce the environmental damage caused by coal utilization, and achieve a low-carbon transformation of the energy structure. A functional cemented paste backfill material (F-CBM) utilizing C-BSW for phase change heat storage was invented through orthogonal testing. This study obtained the main factors influencing raw material proportions on F-CBM working properties. Moreover, the optimal ratio of F-CBM raw materials was determined. F-CBM prepared with the optimal ratio showed improved working properties: the thermal conductivity (TC) and specific heat capacity (SHC) were increased by 75.70 % and 111.90 %, respectively, and the highest latent heat value was 17.37 J/g. The F-CBM's strength loss mechanism was discussed in terms of its mesostructure. In addition, it is shown that the backfilling layer formed by F-CBM in the goaf act as a thermal insulation and a phase change heat storage layer. Finally, the mine design principles of GE-COSM at different stages are summarized. These findings provide a reference for the application of F-CBM in engineering practice, and lay the groundwork for exploiting the mine geothermal energy. ; A. Fabra acknowledges the support obtained from the Spanish Government through the FPI grant RTI2018-098276-B-I00. J. Baiges gratefully acknowledges the support of the Spanish Government through the Ramón y Cajal grant RYC-2015-17367. R. Codina gratefully acknowledges the support received through the ICREA Acadèmia Research Program of the Catalan Government. This work was partially funded through the TOP-FSI: RTI2018-098276-B-I00 project of the Spanish Government. CIMNE is a recipient of a “Severo Ochoa Programme for Centers of Excellence in R&D” grant (CEX2018-000797-S) by the Spanish Ministry of Economy and Competitiveness. ; Peer ...
    • File Description:
      application/pdf
    • Relation:
      https://www.sciencedirect.com/science/article/pii/S2352152X22012907; https://www.researchgate.net/publication/362088593_A_new_method_for_exploiting_mine_geothermal_energy_by_using_functional_cemented_paste_backfill_material_for_phase_change_heat_storage_Design_and_experimental_study; http://hdl.handle.net/2117/372016
    • Accession Number:
      10.1016/j.est.2022.105292
    • Online Access:
      http://hdl.handle.net/2117/372016
      https://www.researchgate.net/publication/362088593_A_new_method_for_exploiting_mine_geothermal_energy_by_using_functional_cemented_paste_backfill_material_for_phase_change_heat_storage_Design_and_experimental_study
      https://doi.org/10.1016/j.est.2022.105292
    • Rights:
      Attribution-NonCommercial-NoDerivatives 4.0 International ; http://creativecommons.org/licenses/by-nc-nd/4.0/ ; Open Access
    • Accession Number:
      edsbas.3C8771A1