Experimental Research on Heat Transfer and Strength Analysis of Backfill with Ice Grains in Deep Mines

Zhang, Xiaoyan; Jia, Yuhang; Wang, Mei

doi:10.3390/su11092486

Cited by 23 publications

(6 citation statements)

References 27 publications

(30 reference statements)

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“…Zhang et al experimentally studied the distribution law of the internal temperature inside the ice-filled slurry, and the results showed that the mechanical properties of the ice-filled slurry backfill were enhanced to a certain extent. e addition of PCM will affect the compressive strength thermal conductivity and the specific heat capacity [13,14]. Wang et al used CFD simulation and experiment to study the temperature distribution characteristics in the ice-filled filling body, thus verifying the consistency of simulation and experiment.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Study on Heat Transfer Optimization of Backfill Slurry with Ice Particles

Wang

Liu

Jia

et al. 2021

Advances in Civil Engineering

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To reduce the risk of high-temperature geothermal environment in deep mine exploitation, an innovative method for cooling stopes by backfill slurry with ice particles has been focused on. In this paper, aiming at the cooling effect of backfill slurry with ice particles, an experimental device including stope region and ice-filled filling slurry region was established for temperature measurement experimental simulation study. The results showed the ice-filled slurry had a significant cooling effect on the stope region. Orthogonal design experiment and range analysis methods were applied for studying the influencing regularities of four factors, including boundary heat flux, ice-water ratio, sand-cement ratio, and slurry concentration. The effective cooling heat coefficient which is defined by radiation heat flux and boundary heat flux of surrounding rock was applied as an evaluation index for scheme optimization. The influencing rank of the four factors is boundary heat flux >sand-cement ratio >ice-water ratio >slurry concentration. By comprehensive analysis, the optimization of mixture ratio was obtained: the boundary heat flux of the simulated surrounding rocks is 111 W/m2, the ratio of ice to water is 8 : 5, the ratio of sand to cement is 4 : 1, and the slurry concentration is 64%.

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Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Study on Heat Transfer Optimization of Backfill Slurry with Ice Particles

Wang

Liu

Jia

et al. 2021

Advances in Civil Engineering

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“…The deeper the mining depth, the higher the temperature of surrounding rock, and the more serious the thermal hazard. In many countries, thermal hazard in mines appears one after another [5][6][7][8]. In South Africa, gold mines are about 2800 m deep and the temperature of rock reaches 75 • C, whereas the Mponeng gold mine is about 4100 m deep and the temperature of rock reaches 66 • C. In Japan, the Chang-pan coal mines rock temperature reaches 42-48 • C and the water temperature reaches 72 • C. In the Feng-yu lead-zinc mine in Hokkaido, the temperature of rock reaches 69-130 • C. The average geothermal temperature per kilometer is 30-40 • C in Russia, with individual areas reaching 52 • C. In India, where gold mine are about 3000 m deep, the geothermal temperature reaches 70 • C. In China, some mines are one km deep, the rock temperature has exceeded 50 • C. In addition, many countries (e.g., Zambia, Mexico, Nicaragua, Poland, Germany) have thermal hazards in mines.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy

Zhang

Liu

et al. 2020

Energies

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In view of high ground stress, high geothermal temperature, and thermal hazard during deep mineral resource exploitation, the concept of phase-change heat storage backfill was put forward in this study. Further, the corresponding technical system was constructed and the main content involved in technical system, which is the optimized proportion of the backfill slurry added with phase-change materials (PCMs), was examined. Moreover, we elaborated upon the collaborative optimization of a backfill body’s mechanical and thermal properties and the mutual cooperation on backfill mining, geothermal energy exploitation, and simultaneous stope cooling. The heat transfer behavior of a backfill body plays a key role in technology system. We numerically simulated the heat transfer among a backfill body, surrounding rock, and airflow in the heat storage process, as well as the heat transfer between backfill body and cold fluid during the heat release process. The temperature distribution of a backfill body at different heat storage/heat release times—i.e., the temperature distribution and its evolution—with heat transfer were revealed and analyzed. This study can provide theoretical guidance for a phase-change heat storage backfill, as it has an important significance for the collaborative exploitation of mineral resources and geothermal energy.

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“…The virgin rock temperature rises with mining depth [6]. The heat of the surrounding rocks is transferred to the airflow because of the large temperature difference between them, and the thermal environment of the mines continues to deteriorate [7][8][9]. Heat damage then inevitably occurs.…”

Section: Introductionmentioning

confidence: 99%

Development of an Efficient Cooling Strategy in the Heading Face of Underground Mines

Xian

2020

Energies

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Heat damage in deep mines is severe and can lead to adverse health effects. The existing refrigeration schemes for the heading face in excavation roadways aim to cool the whole cooling region. However, the ratio of the area occupied by workers to that of the cooling region is quite small. A great quantity of energy for refrigeration is doomed to waste. In this study, a new cooling strategy for building a non-uniform environment in the heading face was developed. A certain quantity of well-designed tracking air coolers were distributed in the excavation roadway near the heading face. The air cooler tracked the constantly moving workers and blew cold air to them. Economic analysis based on estimation of the cooling load for this cooling strategy was conducted. The airflow in the excavation roadway was numerically simulated to estimate the cooling effect. An average energy saving of approximately 30% could be realized. The thermal environment for the workers whether near the heading face or in the roadway improved. This cooling strategy should be considered in all of mine cooling.

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Experimental Research on Heat Transfer and Strength Analysis of Backfill with Ice Grains in Deep Mines

Cited by 23 publications

References 27 publications

Orthogonal Experimental Study on Heat Transfer Optimization of Backfill Slurry with Ice Particles

Orthogonal Experimental Study on Heat Transfer Optimization of Backfill Slurry with Ice Particles

The Concept, Technical System and Heat Transfer Analysis on Phase-Change Heat Storage Backfill for Exploitation of Geothermal Energy

Development of an Efficient Cooling Strategy in the Heading Face of Underground Mines

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