Active suppression of premixed methane/air explosion propagation by non-premixed suppressant with nitrogen and ABC powder in a semi-confined duct

Jiang, Bingyou; Liu, Zegong; Tang, Mengqi; Yang, Ke; Lv, Pin; Lin, Baiquan

doi:10.1016/j.jngse.2016.01.004

“…CO 2 plays a key role in the whole explosion and can effectively inhibit the positive reaction of gas and oxygen; in the middle and late stages of the explosion, ABC powder plays a key role. Jiang et al 21 designed a semiclosed pipeline with an explosion suppression device. The active explosion suppression effect of nitrogen-coupled ABC powder on methane explosion was studied by experiments.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Two-Phase Explosion Suppression of Gas/Pulverized Coal by Explosion Suppressant

Liu

¹

,

Xu

²

,

Mu

³

2022

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Pulverized coal is widely distributed in coal mine roadways, which can enhance the power of a gas explosion. Explosion suppression technology can effectively reduce the explosion power. At present, rock powder shed, a water bag, and ABC powder are widely used in most coal mine explosion suppression technologies. In order to verify the explosion suppression effect of rock powder, water, and ABC powder in the pulverized coal environment, a series of experiments on a suppressing gas/pulverized coal two-phase explosion were carried out with a self-built large-scale gas explosion experimental system. The experimental study in this paper can provide some reference for the improvement of explosion suppression technology in coal mines. In this paper, through the suppression of a secondary explosion, flame, and impact of pulverized coal, the explosion suppression effects of three kinds of explosion suppressants are comprehensively analyzed. The results show that rock powder has a good inhibitory effect on a secondary explosion and flame of pulverized coal, and water has a good inhibitory effect on the shock wave. ABC powder has the best explosion suppression effect; the inhibition of a secondary explosion of pulverized coal is 4.17 times that of rock powder, the inhibition of flame is 4.28 times that of rock powder, and the inhibition of shock wave is 2.24 times that of water.

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“…Yoshidaa et al [6], Xu et al [7], Parra et al [8], Song and Zhang [9], and Nakahara et al [10] pointed out that water mist has a good effect on gas explosion suppression under certain conditions and the combination of different additives to achieve a suppression effect. Dry powders, such as NH 4 H 2 P 2 O 4 [11,12], ABC [13], and NaHCO 3 /red-mud [14], have been used in explosion suppression studies. e results demonstrated that powder concentration, explosion suppression dose, powder pyrolysis characteristics, and thermal decomposition products can have a different influence on gas explosion inhibition.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cavity Width on Attenuation Characteristic of Gas Explosion Wave

Xu

¹

,

Mu

²

,

Li

³

et al. 2021

Shock and Vibration

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This study aimed to investigate the influence of cavity width on the attenuation characteristic of gas explosion wave. Attenuation mechanism of gas explosion wave through cavity was obtained by numerical simulation. The gas explosion shock wave energy can be greatly attenuated through the cavity structure in five stages, namely, plane wave, expansion, oblique reflection, Mach reflection, and reflection stack, to ensure that it is eliminated. Cavities with various width sizes, namely, 500 ∗ 300 ∗ 200, 500 ∗ 500 ∗ 200, and 500 ∗ 800 ∗ 200 (length ∗ width ∗ height, unit: mm), were experimented to further investigate the attenuation characteristics through a self-established large-size pipe gas explosion experimental system with 200 mm diameter and 36 m length. Results showed an evident attenuation effect on flame duration light intensity (FDLI) and peak overpressure with increasing cavity width. Compared with 300 mm, the overall FDLI decreased by 83.0%, and the peak overpressure decreased by 71.2% when the cavity width was 800 mm. The fitting curves of the FDLI and peak overpressure attenuation factors to width-diameter demonstrated that the critical width-diameter was 2.19 when the FDLI attenuation factor was 1. The FDLI attenuation factor sharply decreased at the width-diameter ratio range from 1.5 to 2.5 and basically remained steady at 0.17 at the width-diameter ratio range from 2.7 to 4.0. The peak overpressure attenuation factor gradually decreased with the increase of width-diameter ratio and changed from 0.93 to 0.28 with width-diameter ratio from 1.5 to 4.0. The research results can serve as a good reference for the design of gas explosion wave-absorbing structures.

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“…9 The suppression effect of spurting superfine ABC powder and nitrogen on the maximum overpressure and flame propagation speed was more apparent than that of ordinary ABC powder and nitrogen. 10 Zhao et al discovered that the fireextinguishing characteristics of dry ammonium phosphate powder are improved as the injection pressure increases. 11 For increasing injection pressure from 0.2 to 1.0 MPa, the extinguishing time reduces from 34 to 4 s.…”

Section: ■ Introductionmentioning

confidence: 99%

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Saenko

¹

,

Yan

²

,

Shamsutdinov

³

et al. 2020

ACS Appl. Nano Mater.

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This paper describes a fire and explosion suppression formulation with increased flowability that ensures fast operation and high efficiency of an active explosion suppression system (complete fire and explosion suppression time = 2.25 ms; spraying capacity = over 98%). For the first time, the possibility of using mesoporous materials of different structures with high specific surface area as flow additives for these formulations has been reported. This also covers the results of an experimental study on the influence of various mesoporous silica materials used as additives on the rheological characteristics of a monoammonium phosphate (MAP)-based fire and explosion suppressant. Particular attention is paid to analysis of the results of the experiments in which the mesoporous materials are protected from moisture via poly(methylhydrosiloxane) hydrophobic modification. The study of the rheology of powders indicates that the flow parameters depend on the surface characteristics of silica nanoparticles and their size and concentration. The incorporation of superhydrophobized silica into MAP leads to a decrease in the cohesion force and an increase in the flow function ff (composition contact angle > 163°). The amount of superhydrophobic silica also affects the autoadhesion forces between particles. It has been established that the minimum resistance of a fire and explosion suppression powder to the flow occurs when modified nanoparticles with SBA-15-type structure are used as additives. The efficiency of hydrophobized silica materials as additives increases greatly with a decrease in the size of their particle agglomerates. The joint use of SBA-15 and Aerosil 380 silicas makes it possible to improve the rheological properties of the fire and explosion suppression formulation and to significantly increase its flowability.

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Active suppression of premixed methane/air explosion propagation by non-premixed suppressant with nitrogen and ABC powder in a semi-confined duct

Cited by 61 publications

References 22 publications

Experimental Study on Two-Phase Explosion Suppression of Gas/Pulverized Coal by Explosion Suppressant

Experimental Study on Two-Phase Explosion Suppression of Gas/Pulverized Coal by Explosion Suppressant

Influence of Cavity Width on Attenuation Characteristic of Gas Explosion Wave

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

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