Numerical simulation of coal dust explosion suppression by inert particles in spherical confined storage space

Wang, Xiang; Huang, Xingwang; Zhang, Xinyan; Zhang, Yansong; Zhang, Yaqing

doi:10.1016/j.fuel.2019.05.102

Cited by 57 publications

(15 citation statements)

References 35 publications

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“…After a coal sample was crushed and screened, the particle size distribution of the sample was tested using a laser particle size analyzer. The analysis results generally showed only one single peak, and the distribution was in the shape of an “A” or occasionally in the shape of an “M”. − The chemical composition of coal dust produced using the above method was identical to that of coal. Research on dust produced in the actual coal mining process was rare, and reports on its particle size characteristics and chemical composition were even rarer.…”

Section: Introductionmentioning

confidence: 91%

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Ding

Zhuang

2020

ACS Omega

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The identification of the dust characteristics in coal mine working faces is essential for preventing coal dust explosion and occupational diseases. In this paper, dust samples from the coal mines in southern Shanxi province and Henan province, central North China, were selected as the research objects. The results show that the dust contains primarily organic matter, as well as considerable amounts of minerals. The chemical composition of dust at the working faces is the most complex. According to the proportion of PM10, the dust composition can be divided into three types: symmetrical, fine-dominated, and coarse-dominated. The wettability of dust increases with the increase of the oxygen–carbon ratio on its surface, increase of ash content, decrease of fixed carbon content, and decrease of particle size. In addition, the great variety of harmful elements in dust, some with a high content, can harm the human body. An explosion index is proposed to evaluate the likeliness tendency of coal dust explosion based on several key affecting factors. The surfactant (0.05% AN solution) adopted in this paper can significantly increase the wettability of coal dust and inhibit the generation of dust greatly, showing good ability in preventing coal dust explosion and occupational diseases.

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Section: Introductionmentioning

confidence: 91%

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Ding

Zhuang

2020

ACS Omega

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“…is research can provide a theoretical basis for shotcrete in mine. High quality wet-mix shotcrete with PET fiber can effectively reduce mine disasters, such as dust and roof accidents [78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95].…”

Section: Relationship Between Shootability and Mechanicalmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

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“…In this paper, two experimental equipments are used, one of which is used to test the coal dust explosion pressure, and the other is used to test the coal dust explosion flame. The author has already introduced the explosion flame test equipment in detail in the literature [29][30][31][32][33], so it will not be introduced again here. In the process of coal dust explosion flame test, the flame propagation distance increases with time.…”

Section: Experimental Equipmentsmentioning

confidence: 99%

“…Therefore, in order to suppress explosions more effectively, many types of inert dusts have been developed. But in the process of developing inert dust, not only the effectiveness of the suppression, but also the economics of the inert dust need to be considered [30,31]. With the continuous breakthroughs in explosion suppression technology, it is hopeful that coal dust explosions will no longer occur through explosion suppression methods in the future, which is also the research goal of this paper.…”

Section: Introductionmentioning

confidence: 99%

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

et al. 2023

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Coal dust explosion is a major accident affecting the safety of coal mine production. In order to control coal dust explosion, using inert dust to suppress explosion is one of the effective methods. Taking the gas-fat coal as the research object and CaCO3, NaCl, and NH4H2PO4 as the inert dust, the suppression effect of inert dust on gas-fat coal dust explosion pressure and flame is studied. It is found that when the gas-fat coal dust particle size is 48~58 ?m, both the maximum pressure and the farthest distance of flame reach the maximum value. Among the three inert dusts, NH4H2PO4 has the best suppression effect, followed by NaCl, and CaCO3 has the worst suppression effect on explosion. The smaller the particle size of NH4H2PO4, the better the explosion suppression effect. When the mass percentage of NH4H2PO4 mixed into gas-fat coal dust is 60%, and the particle size of NH4H2PO4 is 0~38 ?m, the explosion is completely suppressed, it is mainly due to the isolation of the coal dust particles from the oxygen and the dilution of the oxygen concentration.

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Numerical simulation of coal dust explosion suppression by inert particles in spherical confined storage space

Cited by 57 publications

References 35 publications

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

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