Comparison of explosion parameters for Methane–Air mixture in different cylindrical flameproof enclosures

Vishwakarma, R.K.; Ranjan, Vinayak; Kumar, Jitendra

doi:10.1016/j.jlp.2014.07.002

Cited by 21 publications

(6 citation statements)

References 16 publications

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“…Their results shown that the flame acceleration and overpressure caused by tail ignition were more relative to the center ignition. While the ignition of cylindrical explosive vessel at different positions in the same radial section, the explosion pressure was the highest if the ignition position was in the center 19 . He Xuechao et al 20 found that for 90° elbow, there was a great difference in flame combustion state between horizontal and vertical ignition.…”

Section: Introductionmentioning

confidence: 97%

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Zhou

Chen³

et al. 2020

Process Safety Progress

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Ignition position has an important influence on gas explosion, but few researches have been done on the ignition position in T‐type pipe. In this paper, an experimental and numerical study of horizontal and vertical ignition positions in a T‐type pipe has been presented. Results show that the ignition position has a great influence on the flame propagation velocity, flame structure and explosion pressure. In the case of vertical ignition, the maximum pressure appears near the T‐type bifurcation, and there is an obvious stress concentration on the upper side wall of the bifurcation. In the case of horizontal ignition, the maximum pressure appears at the right end of the pipe, and a weak stress concentration occurring at the splitting point. When flame passing through the bifurcation, it takes 12 ms longer than ignition on horizontal, but the time for flame propagates from ignition to the end is less. The “tulip flame” forms three times after flame propagates the bifurcation when ignition on horizontal, but there is no “tulip flame” while ignition on vertical. In the case of vertical ignition, the scale of the vortex at the bifurcation is larger than that in the horizontal. The turbulent kinetic energy is mainly in the horizontal section when ignition on vertical, while it is mainly in the vertical pipe if ignition on horizontal.

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Section: Introductionmentioning

confidence: 97%

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Zhou

Chen³

et al. 2020

Process Safety Progress

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“…Many experimental studies on explosion characteristics of methane in enclosures were conducted using spherical or cylindrical vessels with various aspect ( h /Φ) ratios in order to reveal their characteristics and to propose adequate safety measures. − The explosion characteristics (peak explosion pressure, the maximum rate of pressure rise, and the time necessary to reach the peak explosion pressure) of methane–air mixtures in symmetrical vessels (spherical or cubic) of various volumes within 0.2 L to 25.6 m 3 were reported by many authors − , and discussed in correlation with the initial state of methane–air mixtures (temperature and pressure) and with the initial concentration of flammable mixtures. Other studies were performed in elongated vessels (cylindrical or rectangular), closed or vented to the atmosphere. ,,, Some researchers turned their attention to study the methane explosions in linked vessels. ,− A recent study was focused on the effect of internal components (obstacles) and position of an ignition source on the maximum explosion pressure, rate of pressure rise, and deflagration index in three cylindrical enclosures with different volumes (0.6, 1.9, and 4.1 L) . A great interest is shown toward the inert gas influence on explosion propagation in closed vessels, resulting in the decrease in the peak explosion pressure and the maximum rate of pressure rise, along with the increase in the explosion time. , The results obtained for small-scale vessels have limitations when applied to large-scale vessels, where some new phenomena like flame instabilities appear.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…6,11−15 A recent study was focused on the effect of internal components (obstacles) and position of an ignition source on the maximum explosion pressure, rate of pressure rise, and deflagration index in three cylindrical enclosures with different volumes (0.6, 1.9, and 4.1 L). 10 A great interest is shown toward the inert gas influence on explosion propagation in closed vessels, resulting in the decrease in the peak explosion pressure and the maximum rate of pressure rise, along with the increase in the explosion time. 5,16 The results obtained for small-scale vessels have limitations when applied to large-scale vessels, where some new phenomena like flame instabilities appear.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Initial Pressure and Vessel’s Geometry on Deflagration of Stoichiometric Methane–Air Mixture in Small-Scale Closed Vessels

et al. 2020

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In the present work, experimental data on closed vessel explosions of stoichiometric methane–air mixture are reported for mixtures at ambient initial temperature and various initial pressures between 0.2 and 1.2 bar for small-scale closed vessels. The data are collected as pressure–time records in a spherical vessel and two cylindrical vessels with central ignition. The influence of initial pressure and vessel size and shape on maximum rates of pressure rise and deflagration (severity) indices is examined. In each explosion vessel, a linear correlation of the maximum rate of pressure rise with the initial pressure is found. At all pressures, the rates of pressure rise and the severity factors reached in the spherical vessel exceed those reached in cylindrical vessels as a result of differences in heat losses within these enclosures. The experimental deflagration indices are compared with the adiabatic deflagration indices, calculated by means of peak explosion pressures and laminar burning velocities; the heat losses in various enclosures explain the observed differences. The peak explosion pressures and laminar burning velocities are also used to calculate the dimensionless deflagration indices, found to be less influenced by vessel’s size and shape.

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“…Many scholars have performed experimental and numerical research on the explosion parameters of premixed CH 4 /air. − Several studies show that the initial system temperature and pressure, , addition of inert gas, , contribution of other flammable gas, − geometries of confinement − and existence of obstacles − have great influence on the explosion behaviors of CH 4 , such as the minimum ignition energy, flammability limit, explosion pressure, flame propagation, and intermediate products. The P max and (d P /d t ) max are the two most significant indicators to assess the risks in industrial processes.…”

Section: Introductionmentioning

confidence: 99%

Coupling Analysis of the Flame Emission Spectra and Explosion Characteristics of CH₄/C₂H₆/Air Mixtures

Su¹,

Luo²,

Wang

et al. 2019

Energy Fuels

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This work presents the coupling relationship between the flame emission spectra and explosion characteristics of CH 4 /C 2 H 6 /air mixtures ([CH 4 ] = 7.0, 9.5, and 11.0 vol %; [C 2 H 6 ] = 0−2.0 vol %). A 20 L spherical explosion testing system was used to record the explosion pressure−time curves of the CH 4 /C 2 H 6 /air mixtures at room temperature (18−22 °C) and pressure (1 atm). A flame emission detection system was used to capture the emission spectra of H* and OH* during the gas mixture explosions. In addition, sensitivity analysis was carried out on the change in the mole fraction of the explosion intermediates in a detailed mechanism (GRI-Mech 3.0). The results demonstrate that P max and (dP/dt) max increased with the addition of C 2 H 6 for the fuel-lean state, while the time to reach P max decreased with the addition of C 2 H 6 . For the stoichiometric and fuel-rich states, the opposite was true. Additionally, the trends of P max , (dP/dt) max , and time to reach P max are essentially in accordance with those of I max , (dI/dt) max , and time to reach I max for H* and OH*. Furthermore, on the basis of the sensitivity analysis, the C 2 H 6 addition has a positive effect on the production of OH* at the time corresponding to (dP/dt) max for the fuellean state, while the formation of OH* is inhibited by C 2 H 6 at the time to reach (dP/dt) max for the stoichiometric and fuel-rich states, which is consistent with the experimental results.

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Comparison of explosion parameters for Methane–Air mixture in different cylindrical flameproof enclosures

Cited by 21 publications

References 16 publications

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Influence of Initial Pressure and Vessel’s Geometry on Deflagration of Stoichiometric Methane–Air Mixture in Small-Scale Closed Vessels

Coupling Analysis of the Flame Emission Spectra and Explosion Characteristics of CH₄/C₂H₆/Air Mixtures

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Comparison of explosion parameters for Methane–Air mixture in different cylindrical flameproof enclosures

Cited by 21 publications

References 16 publications

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Effects of ignition position on explosion of premixed propane‐air in a T‐type pipe

Influence of Initial Pressure and Vessel’s Geometry on Deflagration of Stoichiometric Methane–Air Mixture in Small-Scale Closed Vessels

Coupling Analysis of the Flame Emission Spectra and Explosion Characteristics of CH4/C2H6/Air Mixtures

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Coupling Analysis of the Flame Emission Spectra and Explosion Characteristics of CH₄/C₂H₆/Air Mixtures