Explosion venting of hydrogen-air mixtures from a duct to a vented vessel

Li, Hongwei; Guo, Jin; Yang, Fuqiang; Wang, Changjian; Zhang, Jiaqing; Lu, Shouxiang

doi:10.1016/j.ijhydene.2018.05.016

Cited by 26 publications

(10 citation statements)

References 43 publications

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“…Vented explosion of hydrogen air mixtures through a 0.5-m-long duct was investigated and it was found that the use of the relief duct significantly increased the explosion overpressure compared with the cases without the duct for hydrogen concentration ranging from lean to rich [25]. The experiments on explosion venting of hydrogen-air mixtures from a 1.5-m-long duct to a vented cylindrical vessel showed that maximum reduced overpressure first increased and then decreased with an increase in hydrogen concentration [26].…”

Section: Ponizy and Leyermentioning

confidence: 99%

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Yang

Guo

Wang

et al. 2018

International Journal of Hydrogen Energy

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Experiments on duct-vented explosions of hydrogen air mixtures in a 12.3 l cylindrical vessel were conducted, and the effects of duct length and hydrogen concentration on the maximum overpressure and flame behavior within and outside the vented enclosure were investigated. The results show that the maximum overpressure in the vessel first increased and then was maintained nearly unchanged with the length of a relief duct increasing to 2 m. For a given duct length, the maximum overpressure first increased and then decreased when hydrogen concentration increased from 20% to 55%. The burn-up in the duct caused the gas mixtures to move in reverse from the duct to vessel, which consequently decreased the venting efficiency. A pressure wave caused by burn-up in the duct was observed, which resulted in a pressure peak in the external pressure time histories after it traveled outside the duct. The maximum external overpressure first increased and then decreased with an increase in duct length. For a given duct length, the maximum external overpressure increased with an increase in hydrogen concentration.

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Section: Ponizy and Leyermentioning

confidence: 99%

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Yang

Guo

Wang

et al. 2018

International Journal of Hydrogen Energy

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“…Over the recent years, the explosive characteristics of combustible gas with barriers have been extensively studied experimentally. 7 , 8 These studies focused on the shape, 9 − 15 blockage ratio, 16 − 19 location, 20 − 23 number, 24 − 26 spacing, 27 , 28 and fuel concentration. 29 − 33 Further, experiments have been conducted to obtain the explosive pressure parameters and flame transmission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Perforated Polyethylene Material on Propane–Air Explosion in a Confined Space

Qiao

Long³

2022

ACS Omega

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In this study, the effect of polyethylene barriers with different blockage ratios on the explosion behavior of a propane–air premixed gas in a confined space is investigated. The maximum explosion pressure (P max), the deflagration index (K G), and the flame propagation process of the propane–air premixed gas with different barrier thicknesses are examined by using a horizontal closed tube with a length of 0.5 m and a diameter of 0.1 m and a high-speed camera. The atmospheric pressure and temperature of the premixed gas were 101.3 kPa and 18 °C, respectively. Based on the Canny operator, the position of the flame front at different times and the shape of the barriers before and after the explosion are determined, and the propagation speed of the premixed flame and the deformation rate of the barriers are obtained. The results indicate that the barriers change the flow field structure of the unburned gas and increase the folding degree of the flame front. With the increase in the blockage ratio, the explosion of a premixed system becomes more rapid and violent. Under the action of Rayleigh–Taylor instability, the variation in the flame propagation speed induces a change in the tube pressure. In addition, the deformation of a barrier causes a change in the maximum explosion pressure. The greater the deformation ratio of the barrier after the explosion, the larger the maximum explosion pressure.

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“…When inflammable substances escape from gas cookers in households or professional equipment at industrial sites, there an explosive and flammable mixture appears [24][25][26][27]. The explosive-pressure-dynamic parameter-calculation program that we developed accurately describes the explosive-load generation process in premises with no protective structures (PS), as well as in EVS-equipped premises.…”

Section: Introductionmentioning

confidence: 99%

Specifics of Explosion-Venting Structures Providing Acceptable Indoor Explosion Loads

et al. 2021

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This article experimentally and theoretically demonstrates that the presence of blast-relief openings (windows) equipped with explosion-venting structures (EVS) allows explosive pressure to be reduced to a safe level (2–4 kPa). We provide results of model and full-scale experiments aimed at studying the influence of EVS parameters of blast-relief openings in explosion-hazardous buildings on the intensity of explosive loads. It was demonstrated that the maximum explosive-pressure value inside EVS-equipped buildings depends on the EVS start-to-open pressure, the structure’s response rate (lag), and characteristic dimension of the premises. Thus, each particular building requires individual selection of EVS parameters, which provide a safe level of excessive pressure in case of an explosive accident. This aspect, however, prevents the widespread use of EVS at explosion-hazardous sites. This article offers an modest upgrade of the explosion-venting structure that provides an indoor pressure equal to the EVS start-to-open pressure. The suggested innovation excludes the possibility of a significant increase in explosive pressure due to an EVS response delay. The efficiency of the suggested technical upgrade was proven by numerical experiments and indirectly by experimental studies aimed at exploring the physical processes associated with the opening of EVSs after an explosion accident. The use of upgraded EVSs will allow for provision of a known maximum level of the explosion load should an explosion event occur in an EVS-equipped room.

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Explosion venting of hydrogen-air mixtures from a duct to a vented vessel

Cited by 26 publications

References 43 publications

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Effect of a Perforated Polyethylene Material on Propane–Air Explosion in a Confined Space

Specifics of Explosion-Venting Structures Providing Acceptable Indoor Explosion Loads

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