The effect of particle size polydispersity on the explosibility characteristics of aluminum dust

Castellanos, Diana; Carreto-Vazquez, Victor H.; Mashuga, Chad V.; Trottier, Remi; Mejı́a, Andrés; Mannan, M. Sam

doi:10.1016/j.powtec.2013.11.028

Cited by 118 publications

(18 citation statements)

References 32 publications

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“…Moreover, the experimental mass loss was greater than the theoretical result until approximately 375 C. Finally, the theoretical mass loss was greater than the experimental result powders. In the gas-phase, the POÁ and PO 2 Áradicals from the decomposition of APP migrated to combustion zone, 32 and accelerated the radical recombination of HÁ and OHÁ radicals. Therefore, the UPR powders involved in the chemical reaction were reduced, resulting in the lower explosion severity and ignition sensitivity of UPR dust.…”

Section: Suppression Effect Of App On Mit Of Upr Dustmentioning

confidence: 99%

Experimental investigation of the suppression effects of ammonium polyphosphate on explosion characteristics of unsaturated polyester resin dust

Yang

et al. 2020

Fire and Materials

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Summary The suppression effects of Ammonium Polyphosphate (APP) with different mass fractions on the maximum explosion pressure (Pmax), the explosibility index (Kst), the minimum ignition energy (MIE) and the minimum ignition temperature (MIT) of unsaturated polyester resin (UPR) dust were studied. Results indicated that the explosion severity and the ignition sensitivity of UPR dust decreased gradually when the mass fractions of APP increased. There existed a minimum inerting concentration (MIC), and the explosion of UPR dust could be suppressed completely by 60 wt% APP. Moreover, APP had a great inhibiting effect on the MIE of UPR dust cloud. The calculated MIE of UPR dust cloud increased from 10 mJ to 998 mJ when the mass fractions of APP increased to 30 wt%. Furthermore, the MIT of UPR dust cloud increased with the increase of the mass fractions of APP. When the mass fraction of APP increased to 80 wt%, the MIT increased by 290°C. The suppression mechanism of APP was studied according to thermogravimetry (TG) and differential scanning calorimetry (DSC) tests. Thermal analysis results showed that the addition of APP could increase the thermal stability of UPR. The suppression mechanism was reflected on the consumption of H and OH radicals.

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Section: Suppression Effect Of App On Mit Of Upr Dustmentioning

confidence: 99%

Experimental investigation of the suppression effects of ammonium polyphosphate on explosion characteristics of unsaturated polyester resin dust

Yang

et al. 2020

Fire and Materials

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“…The results are shown in Figure 1. The particle size dispersity (σ D ) was calculated using Equation (1) [24]. From these diagrams, the two dust samples shared roughly the same D 50 and σ D , which eliminates the potential impact of particle size difference on the experimental results.…”

Section: Sample Preparationmentioning

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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“…e result is listed in Figure 1. e particle size dispersity (σ D ) was calculated using equation (1) [18]. e result indicated that the three coal dust samples had roughly the same median particle size (D 50 ) and σ D .…”

Section: Coal Sample Preparationmentioning

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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The effect of particle size polydispersity on the explosibility characteristics of aluminum dust

Cited by 118 publications

References 32 publications

Experimental investigation of the suppression effects of ammonium polyphosphate on explosion characteristics of unsaturated polyester resin dust

Experimental investigation of the suppression effects of ammonium polyphosphate on explosion characteristics of unsaturated polyester resin dust

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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