Application of a Novel Liquid Nitrogen Control Technique for Heat Stress and Fire Prevention in Underground Mines

Shi, Bobo; Ma, Li; Dong, Wei; Zhou, Fang

doi:10.1080/15459624.2015.1019074

Cited by 44 publications

(16 citation statements)

References 16 publications

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“…Fires caused by spontaneous coal combustion [13,14] are the main disaster in coal mines. LN 2 also plays an important role in coal mine fire prevention and extinguishing [15][16][17]. The immediate LN 2 infusion technology has been applied in coal mines [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Cooling and Inerting Effects of Liquid Nitrogen Injected into a Confined Space

et al. 2019

Symmetry

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As a highly effective and environmentally benign suppression agent, liquid nitrogen (LN2) has been widely used for fire extinguishing in plants, dwellings, enclosed underground tunnels, and other confined spaces through cooling and inerting. It is of great significance to understand the cooling and inerting effects of LN2 injected into a confined space. A confined-space experimental platform was developed to study the injecting LN2 into the platform with different injection parameters, such as mass flux, pipe diameter, and inclination angle. In addition, a mathematical model of quantitatively assessing cooling and inerting effects was proposed by using heat transfer capacity, inerting coefficient, and cooling rate. Results showed that the inerting effect was gradually enhanced with a mass flux increasing from 0.014 to 0.026 kg/s and then tended to level off; an appropriate pipe diameter of 12 mm was optimal for the cooling and inerting effects in this experiment. In addition, a positively increasing inclination angle could contribute to the cooling and inerting effects. However, there was little effect on the cooling and inerting with an inclination angle less than 0°. This study can provide technical guidances for environmentally friendly fire extinguishing with LN2 in a confined space.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Cooling and Inerting Effects of Liquid Nitrogen Injected into a Confined Space

et al. 2019

Symmetry

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“…11 Xu 12 proposed the sand-suspended slurry to prevent the coalmine fire and researched the suspension mechanism. Shi 14 constructed a liquid nitrogen system to prevent the goaf fire and evaluated the extinguishment effect. Shi 14 constructed a liquid nitrogen system to prevent the goaf fire and evaluated the extinguishment effect.…”

Section: Introductionmentioning

confidence: 99%

Research on a noble extinguish material for the underground fire prevention

Han

Xue

et al. 2019

Fire and Materials

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Summary The three‐phase foam consisted of solid, liquid and gas is regarded as a highly effective measure for the underground mine fire prevention. In this study, the three‐phase foam technology is introduced and a visualization platform is established to exhibit the foam flow in a physical goaf. The diffusion rule and extinguishing performance for three‐phase foam are researched. Test results show that the three‐phase foam has a superior heat resistance than expansion foam in the top goaf. The coal heating rate is postponed after the three‐phase foam processing and the active functional groups are suppressed effectively. Increasing the foam expansion ratio is adverse to the three‐phase foam stability. The field application of three‐phase foam was evaluated via the practical extinguishment effect. The marked reduction in the sealed zone temperature and CO concentration proved that the proposed three‐phase foam technology was effective on controlling the concealed goaf fire.

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“…Guo and Chen [21] used the deep well return air as the cold source of the cooling system to achieve cooling and dehumidi cation on the working surface. Shi et al [22] used liquid nitrogen to inject into the working face to achieve cooling e ect. Guo et al [23] used the heat of the bathing water on the surface and created a refrigeration unit to achieve a heat exchange between the chilled water and the high-temperature air on the working surface; the heat created by the condensation of the refrigeration unit was recovered and the thermal hazard of the high temperatures in the mine was converted into heat energy, thereby improving the energy e ciency.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment and Ventilation Optimization in a Deep Mine

Nie

Xiang

et al. 2018

Advances in Civil Engineering

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In order to address the issue of high temperatures and thermal damages in deep mines, the factors causing downhole heat damage at high temperatures were analyzed, the mine ventilation system was optimized and rebuilt, and a cooling system was established. The proposed cooling system uses mine water as the cooling source, and its features are based on the analysis of traditional cooling systems. The current ventilation system in the 1118 m deep pit of the Jinqu Gold Mine was evaluated, and the ventilation network, ventilation equipment, and ventilation structures near the underground working face were optimized. The low-temperature mine water stored in the middle section of the mine at 640 m depth was used as the cooling source, and a cooling system was established near the 440 m deep middle return well to alleviate the high-temperature and high-humidity conditions of the 280 m deep middle-western area. The results show that the effective air volume in the west wing at 280 m was 3.0 m3/s, the operating ambient temperature was 27.6°C, the relative humidity was reduced to 76%, and the temperature was reduced by 5-6°C after the optimization of the system.

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Application of a Novel Liquid Nitrogen Control Technique for Heat Stress and Fire Prevention in Underground Mines

Cited by 44 publications

References 16 publications

Experimental Investigation on the Cooling and Inerting Effects of Liquid Nitrogen Injected into a Confined Space

Experimental Investigation on the Cooling and Inerting Effects of Liquid Nitrogen Injected into a Confined Space

Research on a noble extinguish material for the underground fire prevention

Heat Treatment and Ventilation Optimization in a Deep Mine

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