Computational fluid dynamics (CFD) modelling on effect of fume extraction

Sam, Kar Yen; Lee, Siong Hoong; Ban, Zhen Hong

doi:10.1016/j.jchas.2019.04.004

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Numerous inventors and researchers have studied issues and aftermaths related to hydrogen leakage, which can be widely categorized into leakage within enclosures, − leakage within partially enclosed compartments, − and leakage at open spaces. − Various mitigation methods such as safe distance, ,, suppression system, − blast wall, − and forced ventilation − have been studied and proposed. Among these methods, forced ventilation via exhaust fan is actively studied because of its applicability in diffusing not only leaked hydrogen but also other toxic or flammable gas releases. − Besides exhaust fan, blower ventilation is another method to induce forced ventilation. Blower ventilation has shown promising results in reducing the hydrogen leakage explosion hazard. − Furthermore, the characteristics of leaked hydrogen under an inert gas atmosphere have been studied and have shown excellent results in suppressing hydrogen fire and explosion. , …”

Section: Introductionmentioning

confidence: 99%

Enhanced Mitigation of Fire and Explosion Risks due to Hydrogen Leakage Using Targeted Nitrogen Nozzle Spray Approach

Tan

Ban

Chen

et al. 2022

ACS Chem. Health Saf.

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Hydrogen leakage may cause destructive incidents due to its high flammability and explosivity. Thus, better preventive methods must be used to mitigate the impacts. This paper proposed an approach using targeted nitrogen nozzle spray to induce both blower ventilation and inert gas atmosphere on leak sources to suppress hydrogen leakage because studies on blower ventilation and inert gas suppression to mitigate hydrogen leakage are usually conducted separately rather than coupled. Its feasibility was studied using computational fluid dynamics. Dispersion of leaked hydrogen, flammability zone, and room temperature were analyzed. Eight cases were conducted to compare three types of nozzle spray orientation, which are horizontal (90°) targeted nozzle spray, slanted (45°) targeted nozzle spray, and overhead sprinkler. The results showed that the slanted (45°) nozzle exhibited better performance. The distance between the nozzle and the leakage point and the nozzle orientations are the deciding factors of equal importance. Shorter distances such as that in targeted sprays can shorten the time for nitrogen to reach the leak source, and more concentrated nitrogen can be presented. However, proper orientation is required to provide better suppression and to prevent further damage. The proposed method can induce blower ventilation and inert atmosphere to suppress the leaked hydrogen effectively. It can be achieved by using existing industrial nozzle, and the hydrogen leakage from different locations can be treated by changing the nozzle orientations.

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