Effects of diaphragm rupturing conditions on self-ignition of high-pressure hydrogen

Kaneko, Wataru; Ishii, Kotaro

doi:10.1016/j.ijhydene.2016.04.211

Cited by 59 publications

(6 citation statements)

References 14 publications

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“…Hydrogen 2022, 3 Similar conclusions were reached in the experimental work [5,6], as it was found that the potential for spontaneous ignition is determined by both the initial hydrogen pressure and by the rupture rate of the burst disk. Faster rupture rate of the diaphragm causes the faster ignition of hydrogen.…”

Section: Introductionsupporting

confidence: 60%

“…Simulation for a storage pressure of 2.43 MPa showed no occurrence of spontaneous ignition for a diaphragm rupture time of 31.7 μs. As observed in experimental (see [5,6]) and numerical studies (see [7,8]) a faster diaphragm opening reduces the ignition delay time and increases the likelihood of ignition. Experimental study [5] recorded that the rupture time of a diaphragm with thickness within the range 0.1-1.0 mm with 5 mm diameter can be between 5 and 20 μs.…”

Section: Effect Of Diaphragm Opening Time On Spontaneous Ignition For...mentioning

confidence: 75%

“…The storage pressure limit leading to spontaneous ignition strongly depends on the geometry and characteristics of the release system and burst disk. Furthermore, the potential for ignition occurrence at a certain pressure is affected by the behaviour and timing of the burst disk opening, as it will affect the primary and reflected shock, and the shock-shock interactions ( [4][5][6]). A faster rupturing rate can increase the likelihood of spontaneous ignition occurrence given the storage pressure is close to the observed limit 9.4 MPa.…”

Section: Effect Of Stored Hydrogen Temperature On Pressure Limit For ...mentioning

confidence: 99%

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Spontaneous Ignition of Cryo-Compressed Hydrogen in a T-Shaped Channel System

2022

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Sudden releases of pressurised hydrogen may spontaneously ignite by the so-called “diffusion ignition” mechanism. Several experimental and numerical studies have been performed on spontaneous ignition for compressed hydrogen at ambient temperature. However, there is no knowledge of the phenomenon for compressed hydrogen at cryogenic temperatures. The study aims to close this knowledge gap by performing numerical experiments using a computational fluid dynamics model, validated previously against experiments at atmospheric temperatures, to assess the effect of temperature decrease from ambient 300 K to cryogenic 80 K. The ignition dynamics is analysed for a T-shaped channel system. The cryo-compressed hydrogen is initially separated from the air in the T-shaped channel system by a burst disk (diaphragm). The inertia of the burst disk is accounted for in the simulations. The numerical experiments were carried out to determine the hydrogen storage pressure limit leading to spontaneous ignition in the configuration under investigation. It is found that the pressure limit for spontaneous ignition of the cryo-compressed hydrogen at temperature 80 K is 9.4 MPa. This is more than 3 times larger than pressure limit for spontaneous ignition of 2.9 MPa in the same setup at ambient temperature of 300 K.

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Section: Introductionsupporting

confidence: 60%

Section: Effect Of Diaphragm Opening Time On Spontaneous Ignition For...mentioning

confidence: 75%

Section: Effect Of Stored Hydrogen Temperature On Pressure Limit For ...mentioning

confidence: 99%

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Spontaneous Ignition of Cryo-Compressed Hydrogen in a T-Shaped Channel System

2022

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“…The diaphragm rupture condition of HPH discharge vents is also a crucial factor affecting spontaneous combustion. Because a jet fire has a high thermal radiation flux, this fire is likely to affect surrounding facilities and cause additional fire and explosion accidents. − …”

Section: Ignition Characteristics Of Hph–air Mixturesmentioning

confidence: 99%

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

Wang

Zhao

et al. 2023

Energy Fuels

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Hydrogen energy is a clean and efficient type of green energy whose use has been widely promoted. However, because of its physical and chemical characteristics, hydrogen tends to cause fires and explosions under certain conditions, which restricts its widespread application. After briefly describing the danger of high-pressure hydrogen (HPH), this paper summarizes the ignition and flame propagation characteristics of HPH leakage diffusion and describes the influences of various factors, such as leakage location, initial leakage velocity, initial pressure, presence of vents, ignition location, pipe size, and presence of obstacles, on these characteristics. HPH is likely to ignite spontaneously at the moment of leakage, and this ignition involves complex dynamics. Finally, the gap in the current research on HPH is described, and suggestions are provided for future research to promote the safe and efficient use of hydrogen energy.

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“…Kaneko et al 10 used a rupture disk to release high-pressure hydrogen into a pipeline and a transparent window at the end of the pipeline to observe the blasting of the rupture disk. They proposed that the blasting process was the main cause of hydrogen self-ignition.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Self-Ignition and Jet Flame of Hydrogen Jets Released under Different Conditions

Pan¹,

Yan

Jiang

et al. 2019

ACS Omega

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Hydrogen is a promising clean energy source and an important chemical raw material. To use hydrogen energy more safely, a high-pressure hydrogen-release platform for hydrogen self-ignition and for generating hydrogen jet flames under different experimental conditions was investigated in this study. The associated experimental analysis was based on the theory of high-pressure hydrogen tube diffusion. We found that the higher the initial release pressure, the greater the intensity of the leading shock. When the initial release pressure was high and the leading shock intensity was strong, hydrogen was more likely to ignite spontaneously inside the tube. The higher the initial release pressure, the faster the average propagation speed of the shock in the same pipe length. The time during which a stable leading shock was formed inside the tube may be related to the initial release pressure. It was found that flame combustion intensified after the passage of air through a Mach disk, and a stable flame was formed more easily at the jet boundary layer away from the orifice axis. The maximum speed of the flame tip and the flame decay speed were very high. Moreover, the flame length and the diameter of the ball flame first increased and then decreased.

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Effects of diaphragm rupturing conditions on self-ignition of high-pressure hydrogen

Cited by 59 publications

References 14 publications

Spontaneous Ignition of Cryo-Compressed Hydrogen in a T-Shaped Channel System

Spontaneous Ignition of Cryo-Compressed Hydrogen in a T-Shaped Channel System

Minireview on the Leakage Ignition and Flame Propagation Characteristics of Hydrogen: Advances and Perspectives

Experimental Investigation of the Self-Ignition and Jet Flame of Hydrogen Jets Released under Different Conditions

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