Comparison on the explosivity of coal dust and of its explosion solid residues to assess the severity of re-explosion

Lin, Song; Liu, Zhentang; Qian, Jiansheng; Li, Xiaoliang

doi:10.1016/j.fuel.2019.04.080

Cited by 87 publications

(27 citation statements)

References 37 publications

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“…The particle size and shape of dust affected by moisture are related to dust explosion characteristics and increase the specific surface area, which is to increase the oxidation reaction area. It affected the explosion characteristics [18][19][20][21][22]. However, the relationship between the explosion of the dust and the moisture content is not only the above-mentioned inhibiting effect, but it may also be promoted under certain circumstances, such as fermentation of grain dust, redox reaction of metal dust, and water which cause combustible gases to be generated.…”

Section: Introductionmentioning

confidence: 99%

Effects of moisture content on explosion characteristics of incense dust in incense factory

Chang

Cheng

Zhang

et al. 2021

J Therm Anal Calorim

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Incense is an indispensable material with religion and life in Asia. It is also a bridge of cultural expression and inheritance. Because the operating environment concentration of dust generated during the production process is considerable, most of the research pertaining to the hazard of incense factories has investigated air pollution, such as PM2.5, PM10, and VOCs. However, the production of incense causes dust dispersion, high temperature from ovens, and static electricity generated by friction. It can all possibly lead a dust explosion. To prevent and alleviate hazard from re-occurring, we used sandalwood dust at an incense factory in Taiwan, measured the effect of moisture content on the explosion parameters under normal conditions by 20-L apparatus, and used the oven to diminish its moisture content to 0%, 10.0%, and 15.0% as a control group to analyze the explosion characteristics at the different moisture contents, such as maximum explosion pressure and explosion limit. The results showed that the minimum ignition energy of dry dust was 30 mJ. Beyond doubt, incense factories face potential explosion hazards. The above results could be evaluated by the most dangerous range to avoid incense dust in this range at the workplace, lessening hazards caused by a dust explosion. The effect of moisture content on the suppression of the dust explosion was explored.

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Section: Introductionmentioning

confidence: 99%

Effects of moisture content on explosion characteristics of incense dust in incense factory

Chang

Cheng

Zhang

et al. 2021

J Therm Anal Calorim

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“…e influence of standard dust diffuser on dust particle size is also a key factor that can not be ignored when analyzing the difference of multiple explosion parameters. Current research results show that the combination of outlet valve and diffusive nozzle may cause abrasion and impact on oil shale dust particles, which will lead to the reduction of oil shale dust particle size [21]. In order to reduce the differences, crude oil shale dust was collected after the dust spraying.…”

Section: An Analysis Of the Experimental Results In The 20 L Explosivmentioning

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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“…The residues are characterized by slower flame propagation velocity and a lower heat generation rate than coal dust. Preliminary analysis indicates that bound carbon, instead of volatiles and chemical bonds in these residues, is additionally burned during the repeated explosion [20].…”

Section: Actual Scientific Research and Publications Analysismentioning

confidence: 99%

Theoretical basis for the formation of damaging factors during the coal aerosol explosion

Zavialova¹,

Kostenko²,

Ляшок³

et al. 2021

Min. miner. depos.

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Purpose. Assessing the process of damaging factors formation during the coal aerosol explosion in mine workings on the basis of theoretical research of the explosion of coal dust deposits in order to substantiate promising methods of protecting miners from their impact. Methods. An integrated approach is used, which includes a critical analysis of literature data on the occurrence and development of coal aerosol explosions in mine workings; theoretical research into the state of the gaseous medium at the characteristic points of the development diagram of the coal dust deposits explosion as a result of mining operations based on the laws of classical physics and chemistry. Findings. The main aspects of the explosion mechanism of dust in a powdery state, accumulated on the surfaces along the mine working perimeter, and the formation of such negative factors as the effect of gaseous medium accelerated movement, have been revealed; high temperature formed during coal and methane detonative combustion; increased gas pressure. The revealed aspects of the dust explosion mechanism make it possible to determine the main directions for protection of miners caught in the explosion. The diagram of the development of settled coal dust explosion along the mine working with normal ventilation conditions, taking into account the influence of seismic waves, has been improved. Originality. Analytical dependences, reflecting the value of gas energy at characteristic points of the diagram, have been determined, and the dynamics of the formation of negative factors caused by the explosion have been revealed. Practical implications. Possible ways of protecting miners from the impact of negative factors caused by the coal aerosol explosion and reducing the severe consequences of such accidents are proposed.

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Comparison on the explosivity of coal dust and of its explosion solid residues to assess the severity of re-explosion

Cited by 87 publications

References 37 publications

Effects of moisture content on explosion characteristics of incense dust in incense factory

Effects of moisture content on explosion characteristics of incense dust in incense factory

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

Theoretical basis for the formation of damaging factors during the coal aerosol explosion

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