Hydrogen gas dispersion studies for hydrogen fuel cell vessels II: Fuel cell room releases and the influence of ventilation

Gitushi, Kevin; Blaylock, Myra L.; Klebanoff, Leonard E.

doi:10.1016/j.ijhydene.2022.04.263

Cited by 15 publications

(2 citation statements)

References 34 publications

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“…Consequently, a broad vapor cloud consisting of low-temperature gas is generated [59]. Ultimately, the vapor cloud undergoes diffusion through ventilation, spreading, and dispersion in the surrounding area [60,61].…”

Section: Leakage Progress Of Hydrogen Releasementioning

confidence: 99%

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

Ryu,

Duong,

Kim

et al. 2023

JMSE

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This paper presents a systematic investigation that encompasses the safety assessment of a fuel preparation room (FPR) intended for a hydrogen-fueled ship. The primary objective is to determine the appropriate ventilation strategy to mitigate the risks associated with potential hydrogen leakage. The study focuses on a case involving an FPR measuring 10.2 m × 5.3 m × 2.65 m, which is part of a 750 DWT hydrogen-powered fishing vessel. To identify the potential events leading to hydrogen dispersion, an event tree analysis is conducted. Additionally, existing regulations and guidelines related to the safety assessments of hydrogen leakage in enclosed areas are summarized and analyzed. Computational fluid dynamics, FLACS-CFD, are utilized for the consequence analysis in order to evaluate the impact of ventilation on hydrogen dispersion and concentration within the FPR. The research findings indicate significant effects of ventilation on the hazards and safety assessments of FPRs and high-pressure fuel gas supply systems. The study highlights that hydrogen vapor tends to accumulate at the ceiling and in the corners and spaces created by the equipment. The position and size of ventilation openings greatly influence the dispersion of hydrogen leakage. Proper ventilation design, including top inlet ventilation and outlet ventilation on the opposite side, helps to maintain a safe FPR by facilitating the efficient dispersion of hydrogen vapor. Moreover, locating inlet ventilation on the same side as the outlet ventilation is found to hinder dispersion, while the cross-ventilation achieved by placing inlets and outlets on opposite sides enhances airflow and dispersion. Consequently, it is recommended to prioritize the structural design of FPRs and implement enhanced safety measures. Additionally, updating the relevant regulations to address these concerns is strongly advised.

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Section: Leakage Progress Of Hydrogen Releasementioning

confidence: 99%

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

Ryu,

Duong,

Kim

et al. 2023

JMSE

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“…For a given leakage condition, the combustible envelope does decrease significantly with ventilation growth. However, the higher ventilation flow rate may increase the hydrogen detection difficulty for sensors [33]. Lee et al [18] proposed a strategy of nitrogen forced ventilation to make the spatial concentration level reach the safety standard faster.…”

Section: Forced Ventilation and Natural Ventilation Brennan S [15] Hy...mentioning

confidence: 99%

Analytical Model of Critical Ventilation Flow Rate for Accidental Hydrogen Leakage in a Confined Space

Sun,

Yang,

Wang

et al. 2023

Energies

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The determination of the critical ventilation flow rate is significant for risk control and standard development during accidental hydrogen leakage in a confined space with hydrogen-related equipment. This paper presents an analytical model for calculating the critical ventilation flow rate through the quantification and constraint solution of the ventilation effect and ventilation cost. The experimental method was used to investigate the effects of nozzle diameter and stagnation pressure on the diffusion and ventilation of horizontal hydrogen leakage in a cuboid chamber. Ventilations from 30 to 180 m3/h were carried out through the rectangular vent. It was shown that the peak concentration of the measuring point was positively correlated with the stagnation pressure and the nozzle diameter. The experimental data were used to verify the analytical model by calculating the effective ventilation time. This study demonstrates that the critical ventilation flow rate can be increased significantly at higher stagnation pressures and larger nozzle diameters. Furthermore, the discrepancy of critical ventilation flow rates under different nozzle diameters will be enhanced with the increase of stagnation pressure. For a stagnation pressure of 0.4 MPa, the critical ventilation flow rate under a 4 mm nozzle even increased by 52% relative to the 2 mm nozzle.

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Advancements in hydrogen generation, storage, and utilizations: A comprehensive review of current trends in Bangladesh

Muntasir Shovon,

Ahamed Akash,

Abdur Rahman

et al. 2024

Energy

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Hydrogen gas dispersion studies for hydrogen fuel cell vessels II: Fuel cell room releases and the influence of ventilation

Cited by 15 publications

References 34 publications

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

Analytical Model of Critical Ventilation Flow Rate for Accidental Hydrogen Leakage in a Confined Space

Advancements in hydrogen generation, storage, and utilizations: A comprehensive review of current trends in Bangladesh

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