Minimum ignition energy of hybrid mixtures of combustible dusts and gases

Addai, Emmanuel Kwasi; Gabel, Dieter; Kamal, Mustafa; Krause, Ulrich

doi:10.1016/j.psep.2016.05.005

Cited by 58 publications

(18 citation statements)

References 9 publications

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“…Many scholars 16 conducted in-depth research on the factors influencing the explosions. Kasmani et al 17 conducted a methane explosion experiment in a cylindrical container and discussed the influence of different ignition positions on the maximum overpressure and flame velocity in the explosion.…”

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confidence: 99%

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Liu

Wang

et al. 2021

Fire and Materials

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This study is aimed at investigating the characteristics of CH 4 explosion diffusion and propagation to the non-methane area. The CH 4 explosion pressure and flame were tested with the aid of a self-built horizontal pipeline system. On this basis, the flame images, photoelectric signals, and pressure propagation laws during explosions of methane with different volume fractions in the pipeline were obtained. The experimental research results indicate that an obvious secondary explosion pressure occurs at L/D = 3.5. After the explosion pressures at different positions along the entire pipeline reach the peak values, they experience varying degrees of oscillations. The maximum explosion pressure in the non-methane zone may occur at different length-to-diameter ratios. When the volume fraction of CH 4 is larger, the maximum explosion pressure occurs farther. However, the explosion pressure at the end of the pipeline is lower than that at the explosion source. The flame intensity and flame duration of methane explosion are remarkably enhanced at L/D = 17.5 and then become gradually weakened in the non-methane area. The variations of explosion pressure are always prior to those of flame signal. CO and CO 2 are the main toxic and harmful gases produced by methane explosions, and high-concentration (13% in this experiment) methane explosions produce a small amount of hydrocarbon gases such as C 2 H 4 and C 2 H 6 . The volume fractions of the gases produced decrease with the increase in the distance from the explosion source. The research results boast great significance for suppressing methane explosions and their propagation in the pipeline.

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confidence: 99%

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Liu

Wang

et al. 2021

Fire and Materials

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“…Dust explosions are a major focus in the field of industrial process safety [2]. In recent years, many scholars have conducted numerous studies on the suppression of various types of dust explosions and have achieved certain results [3][4][5][6][7][8][9]. In order to reduce the risk and probability of dust explosion, the addition of inert powders to combustible dusts can reduce the ignition sensitivity of combustible dusts or terminate dust explosions.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust

Zhong

Jiang

et al. 2022

Processes

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In order to evaluate the effect of inert powder on the ignition sensitivity of sucrose dust, this study investigated the effects of NaHCO3, NaCl, NH4H2PO4 and Al(OH)3 on the minimum ignition energy (MIE) of sucrose dust. The results showed that all four different inert powders inhibited the MIE of sucrose dust, and all of them showed a trend that the smaller the particle size of the inert powders, the better the inhibition effect. The inhibition effect was ranked as NaHCO3 > NH4H2PO4 > NaCl > Al(OH)3. NaHCO3 and NH4H2PO4 had both physical and chemical inhibition effects, which were better compared to NaCl and Al(OH)3, which had only physical inhibition effects. Analysis of the flame images showed that the inert powder slowed down the combustion of the sucrose dust flame and reduced the flame height. No flame appeared in the region of higher inert powder concentration.

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“…The wider the explosion limit range, the more mature the mechanism of flame-induced gas explosion [ 34 ]. Researchers [ 35 , 36 ] have focused on the ignition method, ignition energy point explosion gas theory, and experimental research and have provided some theoretical and technical support for gas explosion shock waves and flame front coupling point explosions of local gas in the excavation roadway.…”

Section: Introductionmentioning

confidence: 99%

Propagation laws of discontinuous gas supply in the excavation roadway

Gao

Shi

et al. 2022

PLoS ONE

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An explosion with a discontinuous gas supply (DGS-explosion) is more complicated than a common secondary explosion. We present the results of a study on the propagation laws of the DGS-explosion induced by a gas explosion in excavation roadways. A rectangular tube was established using ANSYS, similar to an excavation roadway in an underground coal mine. The gas, flame, and shock wave propagation laws were determined by analyzing the explosive gas as it exited the excavation roadway. The results show that the initial explosion caused the flame generated in the DGS-explosion to be significantly stretched. Moreover, the shock wave was reflected by the end of the tube, which resulted in the reverse migration of the local gas after the DGS-explosion. Meanwhile, with the increase in local gas concentrations, the pressure peak and the entire explosion system can increase after the DGS-explosion. The flame region, temperature peak, and flame irregularity in the tube positively correlate with the concentration. These results can provide theoretical support and an experimental basis for preventing and responding to accidents caused by gas explosion accidents.

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Minimum ignition energy of hybrid mixtures of combustible dusts and gases

Cited by 58 publications

References 9 publications

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Inhibition of Four Inert Powders on the Minimum Ignition Energy of Sucrose Dust

Propagation laws of discontinuous gas supply in the excavation roadway

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