The explosion enhancement of methane-air mixtures by ethylene in a confined chamber

Wang, Tao; Luo, Zhenmin; Wen, Hu; Cheng, Fangqin; Liu, Litao; Yang, Shaoqiong; Liu, Changchun; Zhao, Jingyu; Deng, Jun; Yu, Minggao

doi:10.1016/j.energy.2020.119042

Cited by 76 publications

(24 citation statements)

References 65 publications

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“…The effects of the diffusion-thermal instability occurrence, as well as an increase in the mixture reactivity due to hydrogen addition to the turbulent flow, were also confirmed by numerical simulation [18][19][20]. The similar effects can be obtained due to ethylene addition to the methane [21][22][23], however, mixtures of methane with ethylene have a lower explosion capability.…”

Section: Introductionsupporting

confidence: 58%

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

2022

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The article presents the experimental study analysis results of the methane combustion efficiency in a high-enthalpy oxygen-containing flow (HOF) inside of constant cross-section channel, finite along the length. The range of initial HOF enthalpies was considered from 350 to 700 kJ/kg. The regularities of the HOF initial enthalpy influence on the methane combustion efficiency were obtained. The values of the fuel excess coefficient under which the maximum coefficients of methane combustion completeness in the HOF are realized were determined. The data obtained indicate the realization of transitional diffusion-kinetic modes of methane combustion and make it possible to assess the factors limiting the combustion process.

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Section: Introductionsupporting

confidence: 58%

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

2022

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“…Some experimental data on the ignition delay of methane, ethylene, propylene and their mixtures at high pressures are presented in [32]. As shown in this work, the presence of ethylene makes it possible to accelerate the methane combustion reactions.…”

Section: Introductionmentioning

confidence: 78%

The Period of Ignition Delay for Methane-Air Mixture with Hydrogen and Ethylene Additives

et al. 2021

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The article is devoted to estimating the intensifying efficiency of methane-air ignition by adding a small amount of hydrogen and/or ethylene. It presents features of the experimental determination of the ignition delay period for fuel-air mixtures using shock installation and methods of processing empirical data. The testing of the known ignition kinetic models for methane, hydrogen, and ethylene with air was carried out. The results of test calculations were compared with those previously published, as well as original experiments. The kinetic model was chosen to provide the minimum discrepancy between the calculated and experimental data. The regularities of the effect of hydrogen and ethylene additives on the ignition dynamics of the methane-air mixture for the range of initial pressures from 1 to 8 bar at temperatures from 900 to 1100 K were obtained with the use of non-stationary numerical modeling. Methane-air mixtures with the mass fraction of additives not exceeding 10% were studied. The quantitative indicators of possible reduction in the ignition delay period of methane-air mixtures were detected.

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“…The chain-branching and chain-propagating reactions initiated by free radicals play an important role in the chemical reaction. H + O 2 < = > O + OH and H + CH 4 < = > CH 3 + H 2 , which are the most dominant chain branching reactions of methane explosion 28 , contribute to the product amounts of free radicals O and OH 29 . When the mixed gas absorbs enough energy, the molecular chain breaks.…”

Section: Reaction Step Elementary Reactionmentioning

confidence: 99%

A numerical study on the effect of CO2 addition for methane explosion reaction kinetics in confined space

Wang

Liang

Tian

et al. 2021

Sci Rep

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To explore the influence of the CO2 volume fraction on methane explosion in confined space over wide equivalent ratios, the explosion temperature, the explosion pressure, the concentration of the important free radicals, and the concentration of the catastrophic gas generated after the explosion in confined space were studied. Meanwhile, the elementary reaction steps dominating the gas explosion were identified through the sensitivity analysis. With the increase of the CO2 volume fraction, the explosion time prolongs, and the explosion pressure and temperature decrease monotonously. Moreover, the concentrations of the investigated free radicals also decrease as the increase of the CO2 volume fraction. For the catastrophic gas, the concentration of the gas product CO increases and the concentrations of CO2, NO, and NO2 decrease as the volume fraction of CO2 increases. When 7% methane is added with 10% CO2, the increase rate of CO is 76%, and the decrease rates of CO2, NO, and NO2 are 27%, 37%, and 39%, respectively. If the volume fraction of CO2 is constant, the larger the volume fraction of methane in the blend gas, the greater the mole fraction of radical H and the lower the mole fraction of radical O. For radical OH, its mole fraction first increases, and then decreases with the location of peak value of 9.5%, while the CO concentration increases with the increase of the methane concentration. For all the investigated volume fraction of methane, the addition of CO2 reduces the sensitivity coefficients of each key elementary reaction step, and the sensitivity coefficient of reaction promoting methane consumption decreases faster than that of the reaction inhibit methane consumption, which indicates that the addition of CO2 effectively suppresses the methane explosion.

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The explosion enhancement of methane-air mixtures by ethylene in a confined chamber

Cited by 76 publications

References 65 publications

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

Experimental Study of Methane Combustion Efficiency in a High-Enthalpy Oxygen-Containing Flow

The Period of Ignition Delay for Methane-Air Mixture with Hydrogen and Ethylene Additives

A numerical study on the effect of CO2 addition for methane explosion reaction kinetics in confined space

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