A comprehensive method to prevent top-coal spontaneous combustion utilizing dry ice as a fire extinguishing medium: test apparatus development and field application

Qin, Yueping; Guo, Weijie; Xu, Hao; Song, Yipeng; Chen, Youqiang; Ma, Li

doi:10.1007/s11356-021-17213-y

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Density at 20 The following popular compositions were used as extinguishing agents for the containment and suppression of fires involving liquid fuels [14,15,[43][44][45]: tap water, snow, and ice (for low-temperature climatic conditions where water supply is a problem), foaming agent emulsion (kinematic viscosity at 20 • C: no more than 200 mm 2 •s −1 , pH at 20 • C: 6.5-10) with concentrations of 1% (density of the composition: ρ = 1068 kg/m 3 ) and 5% (density of the composition ρ = 1128 kg/m 3 ), and carbon dioxide hydrate powder and tablet.…”

Section: Ts-1 Kerosenementioning

confidence: 99%

Pool Fire Suppression Using CO2 Hydrate

et al. 2022

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This paper presents experimental findings on heat and mass transfer, phase transitions, and chemical reactions during the interaction of CO2 hydrate in powder granules and tablets with burning liquid fuels and oil. The experiments involved CO2 hydrate tablets and spheres made of pressed granules. The fire containment and suppression times were established experimentally. Using the gas analysis data, we studied the effects of the mitigation of anthropogenic emissions from the combustion of liquids and their suppression by gas hydrates. We also compared the performance of water aerosol, foaming agent emulsion, snow, ice, and CO2 hydrate samples as laboratory-scale fire suppressants. The paper further describes the numerical modeling of the CO2 hydrate dissociation during liquid fuel combustion. The rapid carbon dioxide release is shown to prevent the oxidizer from the combustion zone. The suppression of a flame using powder with a granule size of 3 mm requires 20-times less carbon dioxide hydrate than in the case of pressed tablets. Effective conditions are identified for using CO2 hydrates to extinguish fires involving flammable liquids and most common fuels.

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Section: Ts-1 Kerosenementioning

confidence: 99%

Pool Fire Suppression Using CO2 Hydrate

et al. 2022

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“… 11 The main dynamic disasters caused during gas explosion include high temperature and shock waves, which can cause severe casualties and property losses. 12 …”

Section: Introductionmentioning

confidence: 99%

“…The amount of gas emissions increases with increasing mining depth, which increases the possibility of explosion accidents . The main dynamic disasters caused during gas explosion include high temperature and shock waves, which can cause severe casualties and property losses …”

Section: Introductionmentioning

confidence: 99%

“…11 The main dynamic disasters caused during gas explosion include high temperature and shock waves, which can cause severe casualties and property losses. 12 In recent years, many scholars at home and abroad have researched gas/air mixture explosion characteristics, mainly focusing on the change propagation of shock waves and flame waves after explosions. Some effect factors have been investigated, including obstacles, gas concentration, initial temperature and pressure, different structures, ignition energy, and so forth.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Cavity Structure in the Excavation Roadway on the Gas Explosion Characteristics

Gao

Liu

et al. 2022

ACS Omega

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Gas explosion accidents are one of the most severe coal mine disasters. Usually, they can cause considerable property losses and casualties, which seriously restrict the development of the coal mining industry. This study used Ansys/Fluent software to simulate gas explosions in excavation roadways with different cavity structures, and 11 models with different cavity structures were established. The study results show that the propagation law of gas explosion in an excavation roadway with different cavity structures was affected by the cavity shapes, the oval cavity of the long axis/short axis ratio (LA/SA), and the cavity numbers. The overpressure, impulse, and flame speed decreased when a cavity existed, compared to the values in a tube without a cavity. The values of overpressure, impulse, and flame speed were smallest in a rectangular cavity. Furthermore, with increasing the LA/SA, the strength of the gas explosion was reduced significantly. The more the cavities were, the better the intensity of gas explosions was controlled. The research results can provide theoretical support and an experimental basis for preventing and controlling gas explosion accidents.

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