An investigation on the aluminum dustexplosion suppression efficiency and mechanism of a NaHCO3/DE composite powder

Yan, Ke; Meng, Xiangbao

doi:10.1016/j.apt.2020.06.014

Cited by 64 publications

(14 citation statements)

References 32 publications

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“…The inhibiting effects of NaHCO 3 on aluminum dust explosion are not only heat absorption but also isolation and chemical inhibition, − and those of Na 2 CO 3 contain isolation, chemical process, and little heat absorption. The heat absorbed by NaHCO 3 is much higher than Na 2 CO 3 based on the DSC curves.…”

Section: Results and Discussionmentioning

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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Section: Results and Discussionmentioning

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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“…The viscosity results show that when the concentration of CDS exceeds 1 wt%, it has good bonding properties. Compared with three commercially available dust suppressant solutions, the molecules in the solution have stronger interaction [ 43 , 44 , 45 , 46 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Viscosity Experiments Analysismentioning

confidence: 99%

Preparation and Characterization of a Composite Dust Suppressant for Coal Mines

Zhang

Chen

et al. 2020

Polymers

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In an effort to effectively control coal dust pollution and thereby reduce the harm of coal dust to human health, we prepared a highly efficient composite dust suppressant. First, dynamic contact angle and zeta potential measurements were used to select sodium dodecyl sulfonate (SDS) over sodium carboxymethyl cellulose and trisodium methyl silicon as the complementary additive to soy protein isolate for the dust suppressant. We employed viscosity and wind erosion resistance tests to compare the performance of the composite dust suppressant with three common, commercially available suppressants. As the concentration of the composite dust suppressant was increased, the viscosity increased, reaching a maximum value of 22.7 mPa·s at a concentration of 5 wt%. The 5 wt% concentration of the composite dust suppressant provided the lowest wind erosion rate (20.62%) at a wind speed of 12 m/s. The composite dust suppressant also had good bonding performance and wind erosion resistance. Scanning electron microscopy, X-ray diffraction, and thermogravimetric analysis were used to characterize the properties of the dust suppressants. The dust suppressant, which had a crystal-like structure, could easily capture coal dust and form an effective package. In addition, the density of the dust suppressant film increased as its crystallinity increased. The increased density was beneficial in that it enabled the dust suppressant to form a hard, solidified shell on the surface of coal dust, which improved dust suppression. The composite dust suppressant also had good thermal stability.

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“…In this paper, components of the powder system are magnesium hydroxide, sodium bicarbonate and calcium carbonate. The last two compounds are commonly used in the extinguishing powders [ 22 , 23 , 24 , 25 , 26 , 27 ], but there is a lack of information about their mutual influence on the extinguishing effect. Hence, studies on the determination of the effect of magnesium hydroxide at the expense of sodium bicarbonate on both the fire extinguishing efficiency and the mechanism of action are justified.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

et al. 2022

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This article analyzes the possibility of the modification of BC powder (a mixture of sodium bicarbonate and calcium carbonate) with magnesium hydroxide (Mg(OH)2). Extinguishing efficiency as well as the influence of this additive on other physicochemical properties were determined by performing a 13B fire test, rheological measurements of the powders, thermal tests (thermogravimetry (TG) and differential scanning calorimetry (DSC) in combination with quadrupole mass spectrometry (QMS)) and microscopic observations of the powders’ surface (scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDS)). It was found that the increase of the Mg(OH)2 content causes deterioration of the rheological properties by increasing the slope angle of the flow curve in relation to the normal stress (the tangent of the flow curve slope varying from 0.258 for 5% of Mg(OH)2 up to 0.330 for 20% of Mg(OH)2). However, at the same time, the increased content of Mg(OH)2 increases the total energy of the chemical decomposition reaction (from −47.27 J/g for 5% of Mg(OH)2 up to −213.6 J/g for 20% of Mg(OH)2) resulting in the desirable higher level of heat removal from the fire. The initial extinguishing effect of the fire becomes more effective as the hydroxide content increases (within the first 2 s), but at a later stage (from t = 63 s), the temperature is no longer sufficient (it is below 350 °C) for thermal decomposition of Mg(OH)2. As such, the optimal content of Mg(OH)2 is 10–15%. The obtained results allowed for the assessment of the impact of individual powder components on its extinguishing effect and will contribute to the development of science in the field of developing new types of extinguishing powders.

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An investigation on the aluminum dustexplosion suppression efficiency and mechanism of a NaHCO3/DE composite powder

Cited by 64 publications

References 32 publications

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

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

Preparation and Characterization of a Composite Dust Suppressant for Coal Mines

The Effect of Magnesium Hydroxide Addition on the Extinguishing Efficiency of Sodium Bicarbonate Powders

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