A Comprehensive Set of Cooling Measures for the Overall Control and Reduction of High Temperature-Induced Thermal Damage in Oversize Deep Mines: A Case Study

Zhang, Wei; Wang, Tianyi; Zhang, Dongsheng; Tang, J.; Xu, Peng; Duan, Xinyi

doi:10.3390/su12062489

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…The rough element satisfies the fractal characteristics of statistical self-similarity, and the height h is proportional to the area of the bottom surface. 27 We assume constant C, then the total volume of the rough element in a fractal element can be obtained according to Equation (5).…”

Section: 𝜙 =mentioning

confidence: 99%

“…[1][2][3] The mining of deep coal resources will face a severe high-temperature environment, but at the same time, the geothermal resources contained in the deep can be used as symbiotic resources for mining and utilization. 4,5 The common problem involved is the heat transfer inside or between the coal rock mass and its exchange medium. 6 Therefore, establishing the relationship between pore structure and thermal conductivity is the key to clarifying the heat transfer of rock and even stratum.…”

Section: Introductionmentioning

confidence: 99%

“…Deep mining will become the new normal of sustainable development of the coal industry and resource development, which brings both opportunities and challenges 1–3 . The mining of deep coal resources will face a severe high‐temperature environment, but at the same time, the geothermal resources contained in the deep can be used as symbiotic resources for mining and utilization 4,5 . The common problem involved is the heat transfer inside or between the coal rock mass and its exchange medium 6 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Implementation and validation of effective thermal conductivity model of coal‐rock mass with rough capillary pore structure under CT three‐dimensional reconstruction

Zhao,

Tu,

Liu

et al. 2023

Num Anal Meth Geomechanics

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On the strength of the capillary physical equivalent model and heat transfer law of series‐parallel combined structural unit, the calculation model of effective thermal conductivity of coal‐rock mass is obtained. The model considers the effect of roughness, porosity factor and other factors on effective thermal conductivity. CT digital core technology is applied to reconstruct the 3D model of coal‐rock mass, and one‐way heat transfer numerical simulation is carried out according to the model. It indicates that the internal temperature of coal‐rock mass is non‐uniformly distributed under the influence of pore structure, and the isothermal surface of pore region bulges towards the boundary of heat flux. Comparing the calculated and simulated values under the same conditions, the average error percentage of the theoretical calculation model is 6.95%, and the model has outstanding prediction performance in porous media with medium porosity and regular pore distribution, which provides a reference for predicting the effective thermal conductivity of coal‐rock mass.

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Section: 𝜙 =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implementation and validation of effective thermal conductivity model of coal‐rock mass with rough capillary pore structure under CT three‐dimensional reconstruction

Zhao,

Tu,

Liu

et al. 2023

Num Anal Meth Geomechanics

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“…However, in this area, the thermal effect mainly comes from the high-temperature airflow of the working face (Guo et al, 2017; Xu et al, 2022). Reducing the temperature of the airflow in the area is necessary to prevent the airflow of the working face from being heated (Zhang et al, 2020). Therefore, the study of heat transfer characteristics in production mines is an important factor and plays a vital role in controlling thermal hazards.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of surrounding rock heat dissipation and wind temperature prediction in high geotemperature coal face

Wang

2023

Energy Exploration & Exploitation

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The heat damage in a coal face of a high-temperature mine is a significant mine disaster owing to various heat sources. Understanding the influence of various heat sources on the air temperature distribution in the coal face can help us to determine reasonable working conditions. Therefore, it is necessary to take into account the coupling relationship of multiple heat sources and obtain accurate prediction results. In this paper, the finite volume calculation method is used to establish a numerical model of heat dissipation of surrounding rock considering the difference in thermal and physical properties of coal and rock in the coal face. And then, a high-temperature coal mine in the northeast of China is taken as an example to explore the airflow temperature distribution law of the coal face under the influence of the absolute heat source and the relative heat source via the finite difference method. Furthermore, an orthogonal test was performed to investigate the influence degree of major factors on heat exchange of the coal face through range analysis. This work supplements the existing numerical model and research, and provides a theoretical basis and more accurate practical methods for predicting the thermal environment of coal face, especially in high mining depth mines.

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“…Zhai et al [17] designed an LCO 2 circulating refrigeration system using the liquid carbon dioxide phase-change endothermic principle and used COMSOL Multiphysics software to simulate the heat transfer performance between CO 2 and airflow. The results showed that when the CO 2 consumption rate was 13.54 m 3 /h, the temperature of the airflow in the drift decreased by 7.72 • C. Zhang et al [18] used a mobile refrigeration unit, water source heat pump refrigeration unit, and ground centralized ice-cold radiation system to form a comprehensive refrigeration system. The integrated system reduced the average temperature of the main operating site by 8 • C and the average temperature of the underground working surface was kept below 26 • C. Tu et al [19] designed a free-cooling auxiliary air conditioning system that could significantly improve the annual average energy efficiency ratio of the system.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mobile Refrigeration System at a High Temperature Working Face of an Underground Mine

Huang

et al. 2022

Energies

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With an increase in mining depth, the problem of heat damage in metal mine working face has become increasingly prominent. In order to effectively reduce the temperature of the working face and provide a comfortable working environment for the miners, based on the concept of “cooling on demand”, a mobile refrigeration system for high-temperature working face was designed, and a field test was carried out in Dahongshan Copper Mine, Yunnan Province. At the same time, based on the experimental conditions, the parameter optimization research of the mobile refrigeration system was carried out. The results showed that: (1) The mobile refrigeration system could reduce the wet bulb temperature of the working face at the test site to below 30 °C, which is in line with the “Safety Regulations for Metal and Non-Metallic Mines” (GB16423-2020); (2) when the diameter of the air supply pipe was 600 mm and the air supply velocity was 12 m/s, the target cooling area could meet the continuous operation requirements stipulated in the “Safety Regulations for Metal and Non-metallic Mines” in China; (3) for every 2 °C decrease in supply air temperature, the average wet bulb temperature in the target cooling area decreased by 0.9 °C; (4) for every 10% decrease in supply air humidity, the wet bulb temperature and relative humidity in the target cooling area decreased by 0.76 °C and 4.38% on average, respectively. The research results provide new ideas and methods for the prevention and control of heat damage in metal mines.

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A Comprehensive Set of Cooling Measures for the Overall Control and Reduction of High Temperature-Induced Thermal Damage in Oversize Deep Mines: A Case Study

Cited by 17 publications

References 19 publications

Implementation and validation of effective thermal conductivity model of coal‐rock mass with rough capillary pore structure under CT three‐dimensional reconstruction

Implementation and validation of effective thermal conductivity model of coal‐rock mass with rough capillary pore structure under CT three‐dimensional reconstruction

Numerical study of surrounding rock heat dissipation and wind temperature prediction in high geotemperature coal face

Research on the Mobile Refrigeration System at a High Temperature Working Face of an Underground Mine

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