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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hdl:2117/372016
Tipus de documentArticle
Data publicació2022-10
EditorElsevier
Condicions d'accésAccés restringit per política de l'editorial
(embargat fins 2024-07-18)
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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.
CitacióLiu, H. [et al.]. A new method for exploiting mine geothermal energy by using functional cemented paste backfill material for phase change heat storage: design and experimental study. "Journal of energy storage", Octubre 2022, vol. 54, p. 105292:1-105292:17.
ISSN2352-152X
Versió de l'editorhttps://www.sciencedirect.com/science/article/pii/S2352152X22012907
Fitxers | Descripció | Mida | Format | Visualitza |
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Journal of Energy Storage-Manuscript-postprint.pdf | 3,616Mb | Accés restringit |