THERMAL SCIENCE

International Scientific Journal

Zeyu Sun

,

Xingxin Nie

,

Jinjiang Liu

,

Xin Zhang

,

Shudu Zhang

,

Min Yang

,

Zhao Wang

,

Yibo Lou

,

Ting Guo

,

Xiaoxin Luo

,

Tong Guo

THERMAL ENVIRONMENT IMPROVEMENT OF UNDERGROUND MINE TUNNELING FACE USING ENHANCED GEOTHERMAL SYSTEM TECHNOLOGY

ABSTRACT
To solve the problem of high temperature thermal damages to the mine underground driving working face of a dry-hot-rock-enriched area, an active cooling method for fracturing water injection of the surrounding rock of the deep mine is proposed based on analysis of the heat dissipation mechanism of the surrounding rock. An artificial thermal reservoir is formed in the high temperature rock mass around the tunneling roadway by stimulation, such as a high pressure crack, and the heat energy of the surrounding rock is extracted by heat exchange of the heat-carrying fluid and the high temperature rocks mass to reduce the ambient temperature of the roadway. The design of a downhole water injection cooling system based on enhanced geothermal system technology is presented and a simplified enhanced geothermal system heats collection model is used for fluid-enclosure. Numerical simulation of the temperature field of the rock coupling shows that the temperature of the surrounding rock can be effectively reduced by increasing the water injection speed and fracture porosity, and improvement of the underground thermal environment can improve the working efficiency. For a water injection rate of 14 m/s and porosity of 0.18, the average cross-section temperature was 41.95℃, which is nearly 5℃ lower than the original rock temperature of 46.85℃.
KEYWORDS
Mine thermal environment, Active cooling, hydraulic fracturing, Hot Rock
PAPER SUBMITTED: 2023-03-05
PAPER REVISED: 2023-04-19
PAPER ACCEPTED: 2023-04-25
PUBLISHED ONLINE: 2023-06-11
DOI REFERENCE: https://doi.org/10.2298/TSCI230305132S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 6, PAGES [5015 - 5024]
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Thermal environment improvement of underground mine tunneling face using enhanced geothermal system technology

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence