Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes

The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which can be used as the heat supply for buildings in mines and the surrounding areas. The efficient perfor...

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Autores principales:	Chao Huan, Sha Zhang, Xiaoxuan Zhao, Shengteng Li, Bo Zhang, Yujiao Zhao, Pengfei Tao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	backfilled stope CPB thermophysical property sedimentary characteristic heat transfer Technology T
Acceso en línea:	https://doaj.org/article/73e7ab3f57e84ea79c030cd953754747
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spelling	oai:doaj.org-article:73e7ab3f57e84ea79c030cd9537547472021-11-11T16:06:52ZThermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes10.3390/en142174001996-1073https://doaj.org/article/73e7ab3f57e84ea79c030cd9537547472021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7400https://doaj.org/toc/1996-1073The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which can be used as the heat supply for buildings in mines and the surrounding areas. The efficient performance of this system strongly depends on the thermal exchange process between the HET and its surrounding cemented paste backfill body (CPB). In this study, a validated simulation model is established to investigate the heat exchange performance of CPB, in which the nonuniformly distributed thermal properties in CPB are fully considered. The results indicate that the increase in the porosity has a negative effect on the heat exchange performance of CPB. With the increase in the porosity, the decreased rate of the conductive heat transfer in CPB could be up to approximately 18%. In conditions with seepage flow, the heat transfer capacity of CPB could be effectively improved. Generally, a higher hydraulic conductivity corresponds to a higher heat transfer performance of CPB. When the seepage velocity rose from 2 × 10<sup>−6</sup> to 6 × 10<sup>−6</sup> m/s, the thermal conductivity of CPB achieved a 114% increase from 1.843 to 3.957 W/(m·K). Furthermore, it was found that the thermal energy accumulates along the seepage flow direction, enhancing the thermal influencing radius of the HET in this direction. Thus, the arrangement of HETs should fully take into account the seepage flow effect. This proposed simulation model could provide a reference for parameter determination and optimization of CMBG systems.Chao HuanSha ZhangXiaoxuan ZhaoShengteng LiBo ZhangYujiao ZhaoPengfei TaoMDPI AGarticlebackfilled stopeCPBthermophysical propertysedimentary characteristicheat transferTechnologyTENEnergies, Vol 14, Iss 7400, p 7400 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	backfilled stope CPB thermophysical property sedimentary characteristic heat transfer Technology T
spellingShingle	backfilled stope CPB thermophysical property sedimentary characteristic heat transfer Technology T Chao Huan Sha Zhang Xiaoxuan Zhao Shengteng Li Bo Zhang Yujiao Zhao Pengfei Tao Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
description	The combined mine backfill–geothermal (CMBG) system can be used to effectively extract geothermal energy by installing a heat exchange tube (HET) in the underground backfilled stopes of mines, which can be used as the heat supply for buildings in mines and the surrounding areas. The efficient performance of this system strongly depends on the thermal exchange process between the HET and its surrounding cemented paste backfill body (CPB). In this study, a validated simulation model is established to investigate the heat exchange performance of CPB, in which the nonuniformly distributed thermal properties in CPB are fully considered. The results indicate that the increase in the porosity has a negative effect on the heat exchange performance of CPB. With the increase in the porosity, the decreased rate of the conductive heat transfer in CPB could be up to approximately 18%. In conditions with seepage flow, the heat transfer capacity of CPB could be effectively improved. Generally, a higher hydraulic conductivity corresponds to a higher heat transfer performance of CPB. When the seepage velocity rose from 2 × 10<sup>−6</sup> to 6 × 10<sup>−6</sup> m/s, the thermal conductivity of CPB achieved a 114% increase from 1.843 to 3.957 W/(m·K). Furthermore, it was found that the thermal energy accumulates along the seepage flow direction, enhancing the thermal influencing radius of the HET in this direction. Thus, the arrangement of HETs should fully take into account the seepage flow effect. This proposed simulation model could provide a reference for parameter determination and optimization of CMBG systems.
format	article
author	Chao Huan Sha Zhang Xiaoxuan Zhao Shengteng Li Bo Zhang Yujiao Zhao Pengfei Tao
author_facet	Chao Huan Sha Zhang Xiaoxuan Zhao Shengteng Li Bo Zhang Yujiao Zhao Pengfei Tao
author_sort	Chao Huan
title	Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
title_short	Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
title_full	Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
title_fullStr	Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
title_full_unstemmed	Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes
title_sort	thermal performance of cemented paste backfill body considering its slurry sedimentary characteristics in underground backfill stopes
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/73e7ab3f57e84ea79c030cd953754747
work_keys_str_mv	AT chaohuan thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT shazhang thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT xiaoxuanzhao thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT shengtengli thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT bozhang thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT yujiaozhao thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes AT pengfeitao thermalperformanceofcementedpastebackfillbodyconsideringitsslurrysedimentarycharacteristicsinundergroundbackfillstopes
_version_	1718432421556256768

Thermal Performance of Cemented Paste Backfill Body Considering Its Slurry Sedimentary Characteristics in Underground Backfill Stopes

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