Experimental research of particle size and size dispersity on the explosibility characteristics of coal dust

Li, Qingzhao; Wang, Ke; Zheng, Yuannan; Ruan, Maliang; Mei, Xiaoning; Lin, Baiquan

doi:10.1016/j.powtec.2016.01.035

Cited by 100 publications

(25 citation statements)

References 18 publications

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“…This is because within a certain range, a smaller particle size contributes to dispersion of the coal dust, allowing more coal dust to participate in the explosion (Eckhoff 2009). Smaller particle sizes contribute more to volatilization (Li et al 2016). Therefore, the coal dust particle size is inversely proportional to the explosion pressure.…”

Section: Maximum Coal Dust Explosion Pressure Characteristicsmentioning

confidence: 99%

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Tan

Liu

et al. 2020

Int J Coal Sci Technol

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Coal dust explosion accidents often cause substantial property damage and casualties and frequently involve nano-sized coal dust. In order to study the impact of nano-sized coal on coal dust and methane-coal dust explosions, a pipe test apparatus was used to analyze the explosion pressure characteristics of five types of micro-nano particle dusts (800 nm, 1200 nm, 45 lm, 60 lm, and 75 lm) at five concentrations (100 g/m 3 , 250 g/m 3 , 500 g/m 3 , 750 g/m 3 , and 1000 g/m 3 ). The explosion pressure characteristics were closely related to the coal dust particle size and concentration. The maximum explosion pressure, maximum rate of pressure rise, and deflagration index for nano-sized coal dust were larger than for its micro-sized counterpart, indicating that a nano-sized coal dust explosion is more dangerous. The highest deflagration index K st for coal dust was 13.97 MPa/(mÁs), indicating weak explosibility. When 7% methane was added to the air, the maximum deflagration index K st for methane-coal dust was 42.62 MPa/(mÁs), indicating very strong explosibility. This indicates that adding methane to the coal dust mixture substantially increased the hazard grade.

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Section: Maximum Coal Dust Explosion Pressure Characteristicsmentioning

confidence: 99%

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Tan

Liu

et al. 2020

Int J Coal Sci Technol

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“…Using a 20 L explosion vessel, Cashdollar [8] discussed dust explosibility and measured the minimum explosion concentration (MEC) and limit oxygen concentration (LOC) of coal dust. Li et al [9,10] evaluated the explosion severity of six different ranks of coal dust with respect to P max , (dP/dt) max and compared the explosion severity of dust with different particle sizes and particle size dispersities. Cao et al [11,12] observed the flame propagation of coal dust in a semi-closed glass tube.…”

Section: Introductionmentioning

confidence: 99%

Explosion Characteristics and Flame Propagation Behavior of Mixed Dust Cloud of Coal Dust and Oil Shale Dust

Wang

Zhang

et al. 2019

Energies

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Coal and oil shale are often mined and utilized together, and mixed dust is easily formed in these processes. In order to ensure safe production in these processes, the explosion characteristics of mixed dust were studied. Using a Godbert-Greenwold (G-G) Furnace experimental device, Hartmann tube experimental device, and 20 L explosion vessel, the oil shale and coal mixed dust ignition sensitivity experiment, flame propagation experiment, and explosion characteristics experiment were carried out. The minimum ignition temperature (MIT), minimum ignition energy (MIE), maximum explosion pressure (Pmax), maximum rate of pressure rise ((dp/dt)max), and explosibility index (KSt) parameters and the flame propagation behavior of the mixed dust were analyzed in detail. A scanning electron microscope (SEM) analysis of the coal and oil shale dust before and after the explosion was carried out to study the changes in the microscopic morphology of the dust particles. The results show that due to the oil shale having a high volatile content and low moisture content, in the mixture, the greater the percentage of oil shale, the more likely the dust cloud is to be ignited and the faster the explosion flame is propagated; the greater the percentage of oil shale, the greater the (dP/dt)max and KSt will be and, under a high dust concentration, a greater Pmax will be produced. During explosion, coal dust will experience particle pyrolysis and the gas phase combustion of the volatile matter, followed by solid phase combustion of coal char, whereas oil shale dust will only experience particle pyrolysis and the gas phase combustion of the volatile matter.

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“…Cashdollar [6] and Going et al [7] studied the influence of dust concentration, particle size, and ambient temperature on explosion of different kinds of coal sample. Li et al [8,9] studied P max and (dP/dt) max after several coal dust sample explosions and analyzed them from the perspective of particle size distribution. is concurred with the conclusion of Liu et al [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Ignition Sensitivity and Explosion Severity of Different Ranks of Coal Dust

Wang

Meng

Zhang

et al. 2019

Shock and Vibration

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is study is conducted to examine the ignition sensitivity and explosion severity differences among different ranks of coal dust and reveal the causes underlying these differences. A G-G furnace, a Hartmann tube, and a 20 L explosion tank are used to test MIT, MIE, P max , (dp/dt) max , and other parameters of three different ranks of coal dust. SEM analysis is carried out on the coal dust before and after explosion to compare and trace their microstructure changes. e results indicate that the lower the rank of the coal, the more likely the dust cloud to be ignited, the faster the explosion flame propagated, and the greater the explosion severity. e main drivers behind the ignition sensitivity and explosion severity differences among different ranks of coal dust are the volatile content and pyrolytic property of the coal.

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Experimental research of particle size and size dispersity on the explosibility characteristics of coal dust

Cited by 100 publications

References 18 publications

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Explosion Characteristics and Flame Propagation Behavior of Mixed Dust Cloud of Coal Dust and Oil Shale Dust

Experimental Study on the Ignition Sensitivity and Explosion Severity of Different Ranks of Coal Dust

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