Experimental and numerical studies on the explosion severities of coal dust/air mixtures in a 20-L spherical vessel

Cao, Weiguo; Qin, Qingfeng; Cao, Wei; Lan, Yanhua; Chen, Teng; Xu, Sen; Xiong, Chunhua

doi:10.1016/j.powtec.2017.01.019

Cited by 205 publications

(48 citation statements)

References 24 publications

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“…The typical explosion pressure histories obtained from the 20 L explosion vessel are shown in Figure 8. Two important characteristic parameters describing the dust explosion severity are marked: maximum explosion pressure (P max ) and maximum rate of explosion pressure rise ((dP/dt) max ) [16,17], which are major metrics for evaluating the suppression effect of an explosion suppressant. Burning time T b is defined as the time between the ignition of the dust cloud and the maximum explosion pressure in the explosion tank [18].…”

Section: Suppression Effect Of For Aluminum Dust Explosion Overpressurementioning

confidence: 99%

Suppression of Aluminum Dust Explosion by Ca(H2PO4)2/RM Composite Powder with Core–Shell Structure: Effect and Mechanism

et al. 2019

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A Ca(H2PO4)2/RM composite powder suppressant with core–shell structure was prepared with modified red mud (RM) as the carrier and Ca(H2PO4)2 as the loaded particles, using a solvent–antisolvent process, in an attempt to suppress aluminum dust explosion more effectively. The suppression effects of the Ca(H2PO4)2/RM composite powder suppressant for aluminum dust flame propagation and for explosion overpressure were tested in a vertical glass tube test apparatus and a 20 L explosion vessel. The results show that the Ca(H2PO4)2/RM composite powder suppressant was more effective in suppressing aluminum dust flame propagation and explosion overpressure than either Ca(H2PO4)2 or RM powder alone. Finally, the suppression mechanism of the Ca(H2PO4)2/RM composite powder suppressant was analyzed. On the one hand, a large amount of burning heat was absorbed through the decomposition of Ca(H2PO4)2 and the melting phase transformation of the decomposition product; on the other hand, the strong isolation provided by the RM helped limit flame propagation. The strong adsorptivity of RM allowed this material to adsorb the radicals from the explosion reaction perfectly.

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Section: Suppression Effect Of For Aluminum Dust Explosion Overpressurementioning

confidence: 99%

Suppression of Aluminum Dust Explosion by Ca(H2PO4)2/RM Composite Powder with Core–Shell Structure: Effect and Mechanism

et al. 2019

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“…The pressure change during the dust explosion process is shown in Figure 6. In the figure, t 1 is the ignition timing of the chemical igniter, t 2 is the time when the dust is just ignited, t 3 is the time at which the maximum rate of pressure increase is generated, t 4 is the time at which the maximum explosion pressure is generated, and P 0 is the pressure generated by the chemical igniter air explosion [26,28]. The performance of the 10 J chemical igniter used in the experiments was tested before the start of the experiments.…”

Section: Experimental Principlesmentioning

confidence: 99%

Experimental Study of the Violence Intensity Parameters of the Explosion of Micron-sized Zinc Powder

Shu¹,

Li²

2019

Cent. Eur. J. Energ. Mater.

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The focus of this study was the explosion hazard of micron-sized zinc powder in a small space and low energy environment in the actual using of ventilation pipes of zinc powder processing plants. In the experimental study, the dust explosion parameters in the device (20 L sphere) under special conditions was used, and zinc powder with a median diameter of 3.80 μm was the research material. The experimental conditions were at a temperature 296.15~299.15 K, and a humidity 45~55%. The dust explosion violence parameter of the micronsized zinc powder was measured. The experimental results showed that when the energy of the igniter was 10 J and the explosion violence parameters of micronsized zinc powder dust were largest, the ignition delay time was 162~165 ms, the pressure for powder injection was 1.19~1.21 MPa, and the dust concentration was 1750~1820 g/m 3 . The experimental data were processed by the fitting method, and the degree of influence of three factors on the explosion intensity parameter of micron-sized zinc powder was as follows: dust concentration, ignition delay time, pressure for powder injection. These results are valuable in the design of explosion hazard assessment and anti-explosion measures in zinc powder production. Nomenclature: d dust concentration, [g/m 3 ] e universal constant, e = 2.71828 P 0 initial pressure [Pa] R radius of the container [m] S C burning rate [m/s] x ignition delay time [ms] x I pressure for powder injection [MPa] y maximum explosion pressure [MPa] y R maximum rate of pressure increase [MPa/s] γ ratio of the specific heat capacities

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“…When the energy of the electrostatic spark exceeds the MIE of the surrounding combustible media, an explosion or fire-related disaster is induced. e electrodischarge energy of an insulator with an electrostatic potential of 30 kV can reach up to hundreds of microjoules, which is enough to trigger an explosion of some combustible explosive mixtures [14,15]. erefore, formulating the corresponding rescue and treatment measures in accordance with the characteristics of an explosive accident, particularly the MIE of the explosive material, is a crucial method of preventing the occurrence of secondary accidents.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Multiple Explosions during the Development and Utilization of Oil Shale Dust

Liu

Zhang

et al. 2019

Shock and Vibration

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Oil shale is a kind of high-combustion heat mineral; in the process of exploitation, storage, and utilization, oil shale dust has the risk of explosion. e explosion characteristics and flame propagation behavior of oil shale dust are worth studying. e difference between the multiple explosion behaviors of oil shale dust was investigated with the use of a 20 L explosive spherical tank and a dust MIE experimental device. e explosion characteristics and microstructure changes of the explosive products in multiple explosions were examined. e experimental results show that the maximum explosion pressure (P max ) dropped, and simultaneously, the minimum ignition energy (MIE), the explosion time (t), and the maximum rate of pressure rise ((dp/dt) max ) increased as the explosions continued. Furthermore, the oil shale continued exploding until the third explosion. Some original oil shale dust (OOSD) and explosive residues were analyzed using a scanning electron microscope (SEM) and Fourier transform infrared (FT-IR) spectrometer. e SEM images of the explosive residues indicate a high fragmentation degree and well-developed pore structure during the entire multiexplosion process. Oxygen-containing functional groups, the aliphatic C-H bond, and the aromatic C-H bond in oil shale dust all participated in the oil shale dust explosion process.

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Experimental and numerical studies on the explosion severities of coal dust/air mixtures in a 20-L spherical vessel

Cited by 205 publications

References 24 publications

Suppression of Aluminum Dust Explosion by Ca(H2PO4)2/RM Composite Powder with Core–Shell Structure: Effect and Mechanism

Suppression of Aluminum Dust Explosion by Ca(H2PO4)2/RM Composite Powder with Core–Shell Structure: Effect and Mechanism

Experimental Study of the Violence Intensity Parameters of the Explosion of Micron-sized Zinc Powder

Experimental Study on Multiple Explosions during the Development and Utilization of Oil Shale Dust

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