Flame propagation of premixed hydrogen-air explosions in bend pipes

Mei, Yuan; Shuai, Jian; Zhou, Ning; Ren, Wenjing; Ren, Fei

doi:10.1016/j.jlp.2022.104790

Cited by 18 publications

(3 citation statements)

References 36 publications

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“…Panda and Hecht [111] measured the maximum ignition distance by using non-invasive laser spark focused on the jet axis, and obtained that the ignition distance was linearly proportional to the effective injection diameter. Mei et al [112] carried out numerical research on flame propagation during hydrogen explosion in bend pipes with different angles, showed that the influence of bend structure on flame propagation was mainly concentrated in the middle and late stages.…”

Section: Detection Methods Of Hydrogen Leakagementioning

confidence: 99%

A review on hazards and risks to pipeline operation under transporting hydrogen energy and hydrogen-mixed natural gas

Li,

Song,

Zhang

2024

Sci. Tech. Energ. Transition

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As an efficient and clean fuel, hydrogen energy plays an important role in relieving the energy crisis and achieving the ori-entation of zero carbon emissions. Transportation is the key link in the construction of hydrogen energy infrastructure. For large-scale and long-distance transportation of hydrogen, pipeline transportation has the advantages of high efficiency and cost saving. While using the existing natural gas pipeline to transport hydrogen, it would economize the economic cost, time cost and labor cost. However, the transportation of hydrogen may bring more hazards and risks. Based on the investigation of a large number of literatures, the research advance in hydrogen embrittlement, leakage, combustion and explosion risk of hydrogen and hydrogen-mixed natural gas pipelines was reviewed. The mechanism, research means and evaluation meth-ods of hydrogen embrittlement, as well as the experimental and numerical simulation research results of leakage, combus-tion and explosion were discussed in detail. The definite and important conclusions include: (1) For buried hydrogen-mixed natural gas transportation pipeline, the leakage rate of hydrogen and methane is the same, the formation of the leakage crater is foreign to the nature of leakage gas. (2) When adding less than 25 volume percentage of hydrogen into the natural gas pipelines, the explosion risk would not be increased. Future research should focus on the risk prediction, quantitative risk assessment, intelligent monitoring, and explosion-suppression technical measures of hydrogen and hydrogen-mixed natural gas transportation pipelines, so as to establish comprehensive and multi-level pipeline safety protection barriers.

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Section: Detection Methods Of Hydrogen Leakagementioning

confidence: 99%

A review on hazards and risks to pipeline operation under transporting hydrogen energy and hydrogen-mixed natural gas

Li,

Song,

Zhang

2024

Sci. Tech. Energ. Transition

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“…5b). The flow field is formed in a specific direction because of the pressure difference, and it isolates the contact between the flame tongue and the unburned gas body to a certain extent, reducing the gas combustion chemical reaction near the concave wall [27]. Finally, the development of the flame tongue and the tendency to fade out at the bend are both obviously inhibited.…”

Section: Flame Propagation Process and Flow Field Distribution In Dif...mentioning

confidence: 99%

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

Zhou

Chen

et al. 2023

THERM SCI

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The pipe structures and opening conditions have an important influence on gas explosion, but little research has been done on the coupling analysis of the two. In order to reveal the effect of pipe structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions, the flame structure, flame propagation velocity, explosion pressure and flow field distribution in the explosion process of hydrogen-air premixed gas in different pipe structures were analyzed by numerical simulation. The results show that the flame propagation velocity and pressure are less influenced by the end-opening structure in the initial ignition stage, however, when the flame propagates to the pipe end, the flame propagation velocity in each pipe structure is significantly enhanced. The 90? elbow has a certain inhibitory effect on the flame development, while the T-shaped bifurcation structure can effectively increase the degree of gas detonation. In pipe with large aspect ratio, due to the wall effect, the effect of acoustic oscillation disturbance on the flame front and the airflow release effect of the end-opening, there are two peaks and two troughs in the pressure rise rate curve of each pipeline structure.

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“…When a shock pressure wave hits a solid surface, a new shock wave appears, called a reflected wave, and moves in the opposite direction. According to Russell A. Ogle, reflected waves are important because they usually cause a greater overpressure than the original one [24,27]. Regarding the results of WF dust, it can be seen that the pressure fell when using bends.…”

Section: Influence Of Bends (R/d Ratio Of 06) On Pressurementioning

confidence: 99%

Influence of Bends in the Functionality of Passive Explosion Isolation Valves

Garrido-Ceca

Puig-Gamero²,

Ramírez-Gómez

2022

Applied Sciences

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Explosion isolation flap valves are one of the most used explosion protection systems in process industries; research is essential to improve them and to minimise both human and material losses when dust explosions take place. In this regard, there is little knowledge on the effect of bends in the functionality of these protective systems; hence, the main aim of this work is to bridge this gap. Large-scale dust explosions were performed, using three different types of dust: metal dust and two types of organic dust. In order to analyse the effect of bends in the functionality of these protective systems, results using a straight duct and one with bends were compared for each dust tested. In addition, the influence of the bend radius on aluminium dust explosions was also evaluated. The results indicated that the effect of bends depended on the explosive characteristics of the dust. However, for aluminium and maize starch dusts, bends led to higher pressures and flame velocities. Relevant information is provided to help decision-making when designing these valves. Moreover, such data can be used for consideration in the discussions held by the task force entrusted with developing the standard used to assess their functionality.

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Flame propagation of premixed hydrogen-air explosions in bend pipes

Cited by 18 publications

References 36 publications

A review on hazards and risks to pipeline operation under transporting hydrogen energy and hydrogen-mixed natural gas

A review on hazards and risks to pipeline operation under transporting hydrogen energy and hydrogen-mixed natural gas

The effect of pipe-line structure on the flammability characteristics of hydrogen-air premixed gas under end-opening conditions

Influence of Bends in the Functionality of Passive Explosion Isolation Valves

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