Suppression effects of ultrafine water mist on hydrogen/methane mixture explosion in an obstructed chamber

Wen, Xiaoping; Su, Tengfei; Zhang, Sumei; Pan, Rongkun; Ji, Wentao

doi:10.1016/j.ijhydene.2019.10.110

Cited by 94 publications

(24 citation statements)

References 20 publications

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“…Due to the unburned flammable gases in the pipe, the resulting large-scale vortex causes the periodic oscillation of the pressure curve due to the periodic recoil of air to fully burn. 31 …”

Section: Resultsmentioning

confidence: 99%

Effect of Metal Foam Mesh on Flame Propagation of Biomass-Derived Gas in a Half-Open Duct

Wang

Zhu

et al. 2020

ACS Omega

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The effect of metal foam mesh on flame propagation of biomass-derived gas in a half-open duct was studied. The explanations are based essentially on the experimental investigations of premixed biomass-derived gas explosions carried out in a rectangular half-open combustion chamber. The initial temperature T 0 and pressure P 0 were 300 K and 1.0 atm, respectively. The key parameters of explosive characteristics, such as flame propagation images and explosive overpressure, were analyzed by changing the porosity, the pore density of porous metal foams, and the gas components. The results show that the use of porous metal foam has a significant inhibitory effect on the gas explosion. Although the combustion structure of the flames is similar, the action of the porous metal foam during the experiment also shows the characteristics consistent with the obstacles. When the porosity of the porous foam is 97%, the flame can be stimulated to produce turbulence, and then the shock–flame interaction generated by the reflection of the lead shock wave can enhance the explosion propagation and promote the explosion escalation. However, with the increase of hole density, the existence of the porous metal foam by momentum loss and heat loss to curb the spread of the explosion not only hindered the flow of not flammable but also extracted energy from the expansion of the combustion products at the same time. This study also confirms that the biological hydrogen and methane component has a vital role in the flame, and a reasonable hydrogen and methane ratio can improve the flame burning to get more economic value.

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Section: Resultsmentioning

confidence: 99%

Effect of Metal Foam Mesh on Flame Propagation of Biomass-Derived Gas in a Half-Open Duct

Wang

Zhu

et al. 2020

ACS Omega

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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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“…To ensure that the original air in the duct is completely discharged, at least four times the volume of the gas premixed in the duct should be introduced. 27 The pressure generated by the explosion is collected by a pressure sensor at a frequency of 200 kHz. The image acquisition system includes a high-speed camera and PCC computer software.…”

Section: Methodsmentioning

confidence: 99%

Flame Propagation Characteristics of Syngas-Air in the Hele-Shaw Duct with Different Equivalence Ratios and Ignition Positions

et al. 2022

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In this paper, the effects of different ignition positions and equivalence ratios on the explosion characteristics of syngas in a half-open Hele-Shaw duct were investigated. The ignition points are set at distances of 0 and 500 mm from the closed end. Moreover, the research range of equivalence ratio is 0.8–1.2. The experimental results indicate that different ignition positions and equivalence ratios influence the flame front structure and the dynamic characteristics of flame propagation. When the ignition position is at the closed end, the flame front undergoes several typical propagation stages before eventually reaching the open end of the duct. The time required by the flame to reach the open end decreases as the equivalence ratio increases. Meanwhile, when the ignition is in the middle of the duct, the flame simultaneously spreads to the open and closed ends. The time required to reach both sides decreases with the increase in the equivalence ratio. The flame front structure and pressure are primarily affected by the ignition position and the equivalence ratio. At the same ignition position, flame propagation velocity and maximum overpressure increase with the equivalence ratio. The pressure oscillation becomes more intense when the ignition position is close to the open end. At IP 500 , when the equivalence ratio is 0.8, multiple finger-shaped flame fronts emerge, accompanied by high-frequency flame oscillations. This study can provide guidance for the study of the flame propagation characteristics of syngas in millimeter-scale burners.

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Suppression effects of ultrafine water mist on hydrogen/methane mixture explosion in an obstructed chamber

Cited by 94 publications

References 20 publications

Effect of Metal Foam Mesh on Flame Propagation of Biomass-Derived Gas in a Half-Open Duct

Effect of Metal Foam Mesh on Flame Propagation of Biomass-Derived Gas in a Half-Open Duct

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

Flame Propagation Characteristics of Syngas-Air in the Hele-Shaw Duct with Different Equivalence Ratios and Ignition Positions

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