Study on explosion suppression of coal dust with different particle size by shell powder and NaHCO3

Wei, Xiangrui; Zhang, Yansong; Wu, Guangan; Zhang, Xinyan; Wang, Xiang

doi:10.1016/j.fuel.2021.121709

Cited by 68 publications

(15 citation statements)

References 39 publications

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“…In order to suppress coal dust explosion, the method of using inert dust has been proposed [25,26]. In the process of coal mining, due to mechanical vibration and other reasons, a large amount of deposited coal dust will be generated in the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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Coal dust explosion is a major accident affecting the safety of coal mine production. In order to control coal dust explosion, using inert dust to suppress explosion is one of the effective methods. Taking the gas-fat coal as the research object and CaCO3, NaCl, and NH4H2PO4 as the inert dust, the suppression effect of inert dust on gas-fat coal dust explosion pressure and flame is studied. It is found that when the gas-fat coal dust particle size is 48~58 ?m, both the maximum pressure and the farthest distance of flame reach the maximum value. Among the three inert dusts, NH4H2PO4 has the best suppression effect, followed by NaCl, and CaCO3 has the worst suppression effect on explosion. The smaller the particle size of NH4H2PO4, the better the explosion suppression effect. When the mass percentage of NH4H2PO4 mixed into gas-fat coal dust is 60%, and the particle size of NH4H2PO4 is 0~38 ?m, the explosion is completely suppressed, it is mainly due to the isolation of the coal dust particles from the oxygen and the dilution of the oxygen concentration.

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Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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“…In the field of coal dust explosion, the method of suppressing coal dust explosion by inert dust is mainly used in coal mine tunnels, − because in the coal mine tunnels, due to the coal mine production and transportation, a large amount of suspended coal dust and deposited coal dust will be generated in the tunnel. If there is an ignition source, the coal dust will explode, and the consequences will be very serious.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

et al. 2022

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Coal is an important strategic resource in the world; coal production safety has always been widely concerned. In coal mine production, inert dust can effectively reduce coal dust explosion accidents in mine tunnels. To reveal the suppression effect of inert dust on lignite dust explosion, CaCO 3 , SiO 2 , and NH 4 H 2 PO 4 are selected for suppression experiments. It is found that the lignite dust explosion pressure decreases continuously as the mass percentages of inert dust mixed into lignite dust increase. By calculating the molar mass, the suppression effects of CaCO 3 and SiO 2 on lignite dust explosion are compared. The lignite dust no longer explodes when the mass percentage of NH 4 H 2 PO 4 dust mixed into lignite dust is 70%, indicating that NH 4 H 2 PO 4 is more effective than that of CaCO 3 and SiO 2 . The smaller the particle size of NH 4 H 2 PO 4 , the better the suppression effect on explosion. The lignite dust does not explode when the mass percentage of NH 4 H 2 PO 4 is 60% and the particle size of NH 4 H 2 PO 4 is 25–38 μm, which proves that decreasing the particle size of NH 4 H 2 PO 4 is important to suppress explosion. The research results are of great significance for grasping the explosion suppression effect of inert dust on lignite dust.

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“…With the gradual depletion of shallow coal resources, deep coal mining has become an important development trend in the future. However, in the process of deep mining, there are many engineering disaster prevention and control problems such as rock bursts, floor water inrush, gas outbursts, and coal dust explosions. − Since coal seam water injection is an effective means to prevent outburst and suppress coal dust, it is widely used in coal fields. , In addition, coal seam water injection can increase the water content of the coal mass, change the nature of the coal mass, and reduce the dust concentration during the mining process, thereby reducing the hazards of dust to personnel health and engineering equipment . However, the mechanism of the coal seam water injection process is complicated, and the actual parameter setting often depends on experiences.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of Coal Fracture Surface Roughness on Water Injection Seepage

et al. 2022

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Coal seam water injection has a significant effect on downhole dust resistance. However, during the operation of coal seam water injection, the seepage of the solution in the coal fractures is impacted by the roughness of coal fractures. Therefore, in this study, distilled water and a sodium lauryl sulfate surfactant were used as seepage solutions, kennel coal was used as the research subject, and four coal samples with different roughness coefficients were prepared for seepage experiments. After the analysis and discussion of the experimental results, it is found that the surface roughness of coal fractures hinders the seepage effect of coal seam water injection. The greater the surface roughness of coal fractures, the smaller the permeability coefficient. Furthermore, increasing the injection pressure and fracture aperture can reduce the influence of coal fracture surface roughness on the permeability coefficient. In addition, after sodium lauryl sulfate is added, the permeability coefficient of the coal sample is reduced. This further reveals the seepage of water injection into coal seams and provides certain guidance for the development of coal seam water injection technology.

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Study on explosion suppression of coal dust with different particle size by shell powder and NaHCO3

Cited by 68 publications

References 39 publications

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

Experimental Research on the Suppression Effect of Different Types of Inert Dust on Micron-Sized Lignite Dust Explosion Pressure in a Confined Space

Experimental Study on the Influence of Coal Fracture Surface Roughness on Water Injection Seepage

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