Moderation of Al dust explosions by micro- and nano-sized Al2O3powder

Bu, Yajie; Chang, Li; Amyotte, Paul; Yuan, Wenbo; Yuan, Chunmiao; Li, Gang

doi:10.1016/j.jhazmat.2019.120968

Cited by 79 publications

(7 citation statements)

References 44 publications

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“…As shown in Fig. 2c, d, Bu et al (2020) also found that smaller particles exhibited stronger intermolecular forces that affect coagulation. The micro-sized particles were relatively dispersed.…”

Section: Coal Sample Particle Surface Characteristicssupporting

confidence: 57%

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: Coal Sample Particle Surface Characteristicssupporting

confidence: 57%

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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“…Inhibition systems are an effective approach to mitigating accidental dust explosions. − In such systems, the inhibitor is sprayed into a restricted space immediately following the initiation of an explosion to prevent the expansion and propagation of the explosion. Numerous inhibitors have been developed and applied, such as phosphates, alkali metal salts, − and ultrafine water mists, , each of which involves a different inhibiting function. Thus, it is important to investigate the interaction between a specific inhibitor and a combustible dust.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Chen

Xiao

et al. 2021

ACS Omega

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To characterize the inhibiting effects of sodium bicarbonate (NaHCO 3 ) on aluminum dust, the inhibiting capacities of NaHCO 3 and its solid product sodium carbonate (Na 2 CO 3 ) on the explosions of 10 and 20 μm aluminum dusts were studied using a standard 20 L spherical chamber. Explosion parameters were analyzed based on the induction period and explosion stage to evaluate the inhibiting effects. The results show that the induction period of 10 μm aluminum dust explosion is 18.2 ms, which is shorter than that of 20 μm aluminum dust. Two aluminum dust explosions can be completely inhibited during the induction period when inert ratios of NaHCO 3 are 350 and 150%, respectively, but that is not observed after adding the corresponding amount of Na 2 CO 3 . When the inert ratio ranges from 0 to 150%, the physical effect of NaHCO 3 on 10 μm aluminum is poor and the chemical effect is the essential process. But as the inert ratio increased from 200% to 350%, the physical effect of NaHCO 3 is higher than the chemical effect, suggesting that the physical effect is the key factor. With the increase of NaHCO 3 , the physical effect increases gradually. However, the chemical effect changes little. The physical effects of NaHCO 3 including heat absorption and isolation play an essential role in the inhibiting process, which has a significant impact on the pyrolysis process and explosion parameters. The results of the present work provide guidance for the prevention and control of aluminum dust explosions.

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“…As a consequence, it could be considered to inhibit aluminum dust explosions. Bu et al 9 found that nano-sized Al 2 O 3 powder showed excellent performance for inhibiting aluminum dust explosion compared with micro-sized Al 2 O 3 . Shang et al 10 synthesized the nanoscale MCN inhibitor for inhibiting 30 μm aluminum dust, results showed that the flame propagation could be inhibited efficiently after the addition of MCN.…”

Section: Introductionmentioning

confidence: 95%

Synthesis of a Novel Inhibitor and Its Inhibition Mechanism on Aluminum Dust Explosions

Zhu

Shang

Jiang

et al. 2022

Ind. Eng. Chem. Res.

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A green and efficient nanoinhibitor VC-PA-MEL for aluminum dust explosion was synthesized in this study. The inhibition effect of the novel inhibitor on aluminum dust explosions was systematically studied. Results showed that after adding VC-PA-MEL, the dust flames transited from the luminous flame with a continuous structure to irregular discrete flames. The flame propagation velocities of 30 and 5 μm dust declined to 96.54 and 99.38%, respectively. The minimum inhibition concentrations for 30 and 5 μm aluminum dust were 600 and 800 g/m3, respectively. Explosion residuals were analyzed to reveal the inhibition mechanism of VC-PA-MEL in detail. VC-PA-MEL can effectively inhibit the explosion of aluminum dust through the synergistic physics and chemistry effects. In general, the combustion heat could be absorbed and the free radicals could be scavenged. VC-PA-MEL provides a potential direction for developing efficient inhibitors for the inhibition of aluminum dust explosions and to improve process safety.

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Moderation of Al dust explosions by micro- and nano-sized Al2O3powder

Cited by 79 publications

References 44 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

Investigation on the Inhibition of Aluminum Dust Explosion by Sodium Bicarbonate and Its Solid Product Sodium Carbonate

Synthesis of a Novel Inhibitor and Its Inhibition Mechanism on Aluminum Dust Explosions

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