The influence of N<sub>2</sub>/CO<sub>2</sub> blends on the explosion characteristics of stoichiometric methane–air mixture

Chen, Daiguo; Yao, Yong; Deng, Yongjun

doi:10.1002/prs.12015

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…Yang et al (2020) and Liu et al (2020) compared the suppression effect of adding methane-containing oxidizing bacteria and potassium-containing compounds in ultrafine water mist on methane explosion. Inert gases such as nitrogen (Luo et al, 2018), carbon dioxide (Chen et al, 2019), and heptafluoropropane (Dong et al, 2022b) also perform well in suppressing methane explosion pressure, flame propagation rate, and chemical reaction processes. In addition, the application of new modified powder inhibitors, such as modified fly ash (Guo et al, 2022), modified montmorillonite (Yu et al, 2020), and new composite inhibitors (Sun et al, 2019;Wang et al, 2020;Tang et al, 2021;Li et al, 2022), has likewise demonstrated their inhibition effect on the dynamic behavior of methane explosion.…”

Section: Introductionmentioning

confidence: 99%

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Feng

Zhang²,

Si³

et al. 2023

Front. Mater.

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Metal wire mesh is widely used in the energy industry for its excellent protective properties as a fire stopping and explosion isolating material. In this study, the suppression characteristics of different layers of metal mesh on the dynamic behavior of premixed methane-air flame propagation were studied experimentally. A high-speed photographic schlieren system was used to photograph the explosion process to capture the changes in the microstructure of the flame, and high-frequency pressure sensors and micro-thermocouple measurements were used to capture the flame explosion pressure and temperature. The experimental results show that the suppression effectiveness of wire mesh is a reflection of the coupling of explosive flame propagation behavior and combustion state in the pipe. Increasing the number of mesh layers and mesh density can destroy the microstructure of the premixed methane-air flame front and hinder the progress of flame propagation. Increasing the number of wire mesh layers will delay the peak time of premixed flame propagation speed and reduce the peak speed values of flame propagation. Wire mesh has a pronounced attenuation effect on premixed flame temperature and explosion overpressure. The maximum flame temperature attenuation rate is 34.99%–60.95%, and the maximum explosion overpressure attenuation rate is 33.70%–74.02%. And the suppression effect is greatly enhanced as the increase of mesh layers.

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Section: Introductionmentioning

confidence: 99%

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Feng

Zhang²,

Si³

et al. 2023

Front. Mater.

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“…Many experimental and theoretical studies on methane explosion features and efficient suppression methods have been carried out in recent years. [5][6][7] Ultrafine water mist and noble gas 8 are the principal antiknocks for physical suppression. Powders, inorganic salts, and fluorinated alkanes are other common chemical antiknocks.…”

Section: Introductionmentioning

confidence: 99%

Explosion mitigation of methane–air mixture in combined application of HFC‐227ea/CO₂ and ultrafine water mist in the pipeline

Yang,

Jia,

et al. 2023

Process Safety Progress

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In order to reduce the power of methane explosion in natural gas pipelines and effectively improve the explosion suppression efficiency of a single explosion suppressant, we carry out the explosion suppression of HFC‐227ea/carbon dioxide mixed gas as well as mixed gas/ultrafine water mist through a self‐built methane explosion suppression experimental platform. Based on the changes in parameters such as explosion overpressure, flame propagation velocity, and flame propagation structure, the coupling mechanism of methane explosion suppression between mixed gases and between mixed gases and ultrafine water mist is revealed, which provides scientific support for promoting the development of methane explosion suppression technology. The experimental results show that when the mixed gas HFC‐227ea/carbon dioxide and ultrafine water mist synergistically suppresses methane explosion, the addition of the mixed gas can effectively improve the suppression effect of ultrafine water mist on methane explosion.

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Explosion mitigation of methane‐air mixture in combined application of inert gas and ABC dry powders in a closed compartment

Quan

et al. 2019

Process Safety Progress

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The explosion is one of the most serious safety incidents occurring in the application of the gas methane in industrial process. The new developments in attenuating the destruction and environmental hazard of this explosion are conducted using the combined inert gas and ABC dry powder. The explosive characteristic parameters including flame configuration, velocity of flame propagation, explosion pressure, and pressure rising rate are quantified and revealed. The difference of explosion mitigation effect of ordinary and ultra‐fine ABC dry powders are examined based upon the specific surface area and the settling velocity. As the concentration of ordinary or ultra‐fine ABC dry powder increases, the explosion pressure initially increases and decreases afterwards, indicating that there is an optimal mass concentration of explosion mitigation for both powders. The effect of ignition delay time on the explosion mitigation of ultra‐fine ABC dry powder is characterized on the basis of the turbulent lever and the dry powder particle settling state. Moreover, the mechanisms of explosion mitigation with CO2 and the ultra‐fine ABC dry powder are fully revealed both on the physical and chemical properties. The present research provides basic data and theoretical guidance for prevention and controlling of gas explosion accidents.

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The influence of N₂/CO₂ blends on the explosion characteristics of stoichiometric methane–air mixture

Cited by 7 publications

References 43 publications

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Explosion mitigation of methane–air mixture in combined application of HFC‐227ea/CO₂ and ultrafine water mist in the pipeline

Explosion mitigation of methane‐air mixture in combined application of inert gas and ABC dry powders in a closed compartment

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The influence of N2/CO2 blends on the explosion characteristics of stoichiometric methane–air mixture

Cited by 7 publications

References 43 publications

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Suppression characteristics of multi-layer metal wire mesh on premixed methane-air flame propagation

Explosion mitigation of methane–air mixture in combined application of HFC‐227ea/CO2 and ultrafine water mist in the pipeline

Explosion mitigation of methane‐air mixture in combined application of inert gas and ABC dry powders in a closed compartment

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Product

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The influence of N₂/CO₂ blends on the explosion characteristics of stoichiometric methane–air mixture

Explosion mitigation of methane–air mixture in combined application of HFC‐227ea/CO₂ and ultrafine water mist in the pipeline