Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales

Zhang, Bo; Liu, Hong; Yan, Bingjian

doi:10.1016/j.fuel.2018.11.062

Cited by 68 publications

(12 citation statements)

References 41 publications

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“…The mixed fuels consisting of combustible liquid, solid, or gas are commonly used in industry. Research studies about the explosion of mixed fuels mainly focus on the development and the severity of the explosion. − Compared with simple fuels, there have been only fewer studies on the explosion behavior of solid–liquid mixtures in air. In recent years, the interaction between the components of mixed fuels has received increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

et al. 2021

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In this work, the explosion characteristics of an aluminum (Al)–diethyl ether (DEE)–air mixture were investigated in a 20 L spherical vessel. The effect factors of the explosion characteristics considered were fuel concentration, component proportion, and ignition energy. With the increasing concentration of the mixed fuel (Al/DEE = 1:1), the maximum pressure (P max), the maximum rate of pressure rise ((dP/dt)max), and the flame propagation speed (νF) exhibit an inversely “U-shaped” curve. The maximum P max, (dP/dt)max, and νF values are 901.2 kPa, 148.3 MPa/s, and 15.3 m/s, respectively, corresponding to an optimum concentration of 600 g/m3. The P max, the (dP/dt)max, and the νF increase with the addition of DEE when the proportion of DEE is below 55% but have a decrease tendency when the proportion of DEE is over 55%. As the explosions of Al and DEE were mutually promoting, the studied explosion characteristics of the Al–DEE–air mixture are obviously higher than those of pure Al or DEE in air. The minimum ignition energy (MIE) of the Al–DEE–air mixture is 1.9 mJ, between the MIE of Al and DEE. With the increase of ignition energy, P max, (dP/dt)max, and νF all increase, while the minimum explosion concentration presents a linear decreasing trend. This work could provide significant scientific evidence for evaluating the explosion risk of the Al–DEE–air mixture.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

et al. 2021

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“…In recent years, much research has been performed on determining flammability and explosion parameters, such as flammable limits, − explosion pressure and maximum rate of pressure rise, − minimum ignition energy, − , propagation behaviors, − and limiting oxygen concentration in gas mixtures. − Additionally, researchers have investigated the inerting effect of the addition of water mist and inert gases, such as nitrogen, carbon dioxide, helium, and argon, on flammable gas mixture explosions. , The abovementioned studies have provided a reliable reference for the prevention of gas explosions at the macroscopic level. Similarly, it is necessary to study the micromechanism of combustible gas mixtures to better understand gas explosions and to fundamentally prevent explosions.…”

Section: Introductionmentioning

confidence: 99%

Micromechanism of the Initiation of a Multiple Flammable Gas Explosion

Luo

et al. 2019

Energy Fuels

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To investigate the micromechanism of a multiple flammable gas explosion, CH 4 , CO, C 2 H 6 , C 2 H 4 , and H 2 were selected to determine the thermodynamic and dynamic characteristics of the gas mixture explosion using Gaussian software. The initiation mechanism and primary initiation pathway of the joint explosion of the five combustible gases were analyzed. A spherical experimental device for gas/dust explosions combined with a system for spectral measurements was implemented to obtain emission spectra of the • H radical and CH 2 O during the gas mixture explosion process. The oxidation reaction of CH 4 initiated the chain reaction for the entire explosive reaction rather than the CO/C 2 H 6 /C 2 H 4 /H 2 mixture at the ignition moment of the explosion. Nevertheless, addition of the CO/C 2 H 6 /C 2 H 4 /H 2 mixture had obvious effects on the chain-branching reactions of the CH 4 explosion. The • CH 3 radicals produced during methane oxidation induced a hydrogen reaction, and • H radicals generated in the reaction of • CH 3 and H 2 triggered the involvement of other combustible gases in the explosion reaction, which considerably decreased the activation energy demand by multiple combustible gases to participate in the explosion reaction. The sequence of flammable gases involved in the explosion reaction was CH 4 , H 2 , CO, C 2 H 4 , and C 2 H 6 . Furthermore, the experimental results indicated that the • H radical appeared before CH 2 O during the explosion reaction process, which was consistent with the numerical simulation results. Moreover, the numerical simulation results provided a theoretical basis for the prevention of gas explosions and process safety in the petrochemical and mine industries.

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“…[6][7][8] In the most extreme case, the formed deflagration can lead to detonation, but adopting effective measures to prevent the occurrence of detonation is still a challenge. [9][10][11][12][13][14][15][16] According to the statistics of IChemE (The Institution of Chemical Engineers), dust cloud explosions occur every day in Europe; and among these explosions, Al and metal oxidation account for nearly 20% of all explosions. 17,18 Al is a chemically active substance, and the oxidation of Al easily happens in its reactions with other materials.…”

Section: Introductionmentioning

confidence: 99%

“…When Al powder mixes with air and generates dust clouds, explosions of dust clouds have been recognized as a great threat to human life, safety, and property in the past few decades . In the most extreme case, the formed deflagration can lead to detonation, but adopting effective measures to prevent the occurrence of detonation is still a challenge . According to the statistics of IChemE (The Institution of Chemical Engineers), dust cloud explosions occur every day in Europe; and among these explosions, Al and metal oxidation account for nearly 20% of all explosions .…”

Section: Introductionmentioning

confidence: 99%

Analysis of dispersion behavior of aluminum powder in a 20 L chamber with two symmetric nozzles

Yao

Wang

Chen

et al. 2019

Process Safety Progress

Self Cite

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Although aluminum (Al) powder is a potential fuel that has been widely used in many important fields, Al powders are dangerous because of its flammable and explosive characteristics. From this point of view, the investigation of the explosion characteristics of Al powders is of critical importance. The characteristics of a dust explosion are closely related to the dispersion behavior of the powders. The purpose of this research is to analyze the dispersion behavior of Al powder and the uniformity of dust cloud. The dispersion process of Al powders was studied using a high‐speed camera. Image processing technology was applied to obtain the transmission value of the light beam passing through the Al dust cloud at different locations within a vessel. The images obtained by the high‐speed camera indicated that the dispersion process had three stages, that is, a fast injection stage, diffusion stage, and stabilization stage. By examining the transmission‐time histories at 13 different locations in the chamber and at various Al concentrations (from 100 to 800 g/m3), the decay behavior of transmission under different concentrations was obtained, and the decay time fluctuated from 44 to 68 ms. By comparing the deviation of transmission at different locations and for various concentrations in the stabilization stage, the maximum SD obtained was 8.2%, that meant the dust clouds were relatively uniform. Finally, based on the experimental results, the ignition delay time (after which the powder/air mixture is considered homogeneous) corresponding to different dust concentrations should be different to ensure the accuracy of explosion characteristics test.

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Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales

Cited by 68 publications

References 41 publications

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

Micromechanism of the Initiation of a Multiple Flammable Gas Explosion

Analysis of dispersion behavior of aluminum powder in a 20 L chamber with two symmetric nozzles

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