Influences of a Pipeline’s Bending Angle on the Propagation Law of Coal Dust Explosion Induced by Gas Explosion

Zhang, Leilin; Shi, Biming; Niu, Yihui; Zhong, Zheng

doi:10.1080/00102202.2019.1673381

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…The addition of coal dust also greatly stimulated the development of the explosion flame in the propagation tube, the flame front speed increased to different degrees, and the increase rate reached 314.3%. Zhang et al 15 concluded that gas explosions can rapidly cause the explosion of deposited dust. After the explosion, the peak overpressure of the shock wave increased sharply, and then decreased slowly at the corner, and the overpressure decay rate increased with an increase in bending angle of the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Effect of coal dust parameters on gas‐coal dust explosions in pipe networks

Jia

Fengxiao

et al. 2022

Energy Science & Engineering

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To study the effects of particle size of coal dust and mass concentration of coal dust on gas-coal dust explosions, we conducted sedimentary gas-coal dust explosion experiments using a pipe network system that included multiple components and individual interactions, which were independently designed and constructed. Experimental conclusions were then theoretically verified based on factor response surface theory. When the particle size of coal dust was constant, the maximum explosion pressure, flame propagation velocity, and flame temperature of the explosion initially increased and then decreased with increasing mass concentration. When the mass concentration of coal dust was constant, the maximum explosion pressure, flame propagation velocity, and flame temperature of the explosion also initially increased and then decreased with increasing particle size. The mass concentration and particle size values of the coal dust were 100 g/m 3 and 50 μm, respectively, and under these conditions, the explosion was the most violent. The effects of mass concentration on the maximum explosion pressure and flame temperature were greater than the particle size of the coal dust, and the effect of particle size on the flame front velocity was greater than the mass concentration of the coal dust. The conclusions obtained in this study provide a generalized theoretical basis for the effects of coal dust on hybrid gas-coal dust explosions.effect degree, experimental pipe network, gas coal dust explosion, mass concentration of coal dust, particle size of coal dust | INTRODUCTIONGas-coal dust mixture has a high potential for reaching the detonation stage, which endangers the safety of underground personnel. 1,2 When coal dust is present, the gas explosion power becomes significantly more volatile, and when suspended coal dust is heated, a large amount of combustible gas will become volatilized and attach to the coal dust. As the gas reaches a certain concentration and absorbs significant amounts of heat, a chain reaction will occur. The heat released by oxidation will cause particle flashover, and at a certain point, the explosion power will increase. [3][4][5][6] In pipeline gas explosions, the explosion intensity will increase significantly after mixing with coal dust. In addition, the distance between the maximum explosion pressure of the hybrid explosion

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Section: Introductionmentioning

confidence: 99%

Retracted: Effect of coal dust parameters on gas‐coal dust explosions in pipe networks

Jia

Fengxiao

et al. 2022

Energy Science & Engineering

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“…Based on the above analysis, it can be seen that in contrast to straight pipelines or simple bifurcated pipelines 12 , 15 , 19 , 20 , the overpressure did not show a negative correlation with time during the attenuation process 21 , 22 . Rather, it experienced multiple up-down cycles.…”

Section: Results Analysis and Discussionmentioning

confidence: 91%

“…In straight pipelines, the overpressure attenuation coefficient is an important parameter to quantify the time-varying characteristics of the explosion overpressure 12 , 15 , 19 , 20 . Similarly, in curved or bifurcated pipelines, the overpressure attenuation characteristics can be optimally quantified using the overpressure attenuation coefficient 14 , 17 , 21 , 22 .…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

“…The explosion overpressure was significantly affected by the size of the obstacle and the blockage condition of the pipeline 11 – 13 . In particular, the effect of the pipeline type has received extensive attention in recent years 14 , 15 . For example, Arndt et al 16 reported that a 90-degree bend had the ability to enhance flame speeds and overpressures and shorten the run-up distance to DDT (Deflagration-to-Detonation transition) to a varying degree for several gases.…”

Section: Introductionmentioning

confidence: 99%

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Propagation and attenuation characteristics of shock waves in a gas–coal dust explosion in a diagonal pipeline network

Jia

Xiuyuan

2022

Sci Rep

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In order to obtain the propagation and attenuation characteristics of a shock wave gas–coal dust explosion, a diagonal pipeline network was built to carry out a gas–coal dust explosion experiment. Methane with a volume fraction of 9.5% was mixed with 20 g of coal dust with a particle size of 50 μm. The shock wave attenuation characteristics in the diagonal pipeline network were characterized by the overpressure attenuation coefficient. The results showed that when the shock wave propagated in the diagonal pipeline network, it was offset and superposed multiple times. The overpressure attenuation in diagonal pipes was greater than that in the other pipeline branches. Secondary explosions occurred at all monitoring points. The propagation characteristics of shock waves is less affected by the pipeline network structure when it is close to the outlet of pipeline network. Nonlinear multivariate regression analysis was carried out to analyze the relationship between the overpressure attenuation coefficient and two adjacent monitoring points, the pressure before and after attenuation, and the pipeline angle. The functional relationship was in good agreement with the experiment data.

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“…Many experimental studies have reported that gas explosion can induce the explosion of deposited dust [12][13][14]. The maximum overpressure and flame acceleration mechanism of methane-coal mixed explosion in a horizontally straight pipe is investigated by Song et al [15], Jiang et al [16] and Jiang et al [17].…”

Section: Introductionmentioning

confidence: 99%

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

Guo-xun

Peng

2022

THERM SCI

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A methane and coal dust explosion system was constructed to investigate the propagation of pressure and CO gas after methane and coal dust coupling explosion. The influence of coal dust concentration on the propagation of pressure and CO gas were analyzed by coupling explosion experiments of 5% methane with coal dust (0, 100 g/m3, 200 g/m3, 300 g/m3, 400 g/m3and 500 g/m3), 7% methane with coal dust(0, 50 g/m3, 100 g/m3, 150 g/m3and 200 g/m3), and 9% methane with coal dust (0, 50 g/m3, 100 g/m3, 150 g/m3and 200 g/m3). The experimental results show that when 5% or 7% methane explodes with coal dust in the explosion chamber, the pressure first increases and then decreases with the increase of coal dust concentration. When the methane concentration is 9%, the pressure decreases with the increase of coal dust concentration. In the propagation pipe, the explosion pressure and CO gas concentration decrease with the increase of distance. When the methane concentration and distance are constant, the higher the coal dust concentration is, the higher the pressure and CO gas concentration is.

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Influences of a Pipeline’s Bending Angle on the Propagation Law of Coal Dust Explosion Induced by Gas Explosion

Cited by 18 publications

References 24 publications

Retracted: Effect of coal dust parameters on gas‐coal dust explosions in pipe networks

Retracted: Effect of coal dust parameters on gas‐coal dust explosions in pipe networks

Propagation and attenuation characteristics of shock waves in a gas–coal dust explosion in a diagonal pipeline network

Research on the propagation of pressure and CO gas of methane and coal dust coupled explosion

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