Asphyxiation effect analysis in confined space of B-type oil pool fire under pressure changes of nitrogen extinguishing system

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-12-03 DOI:10.1016/j.csite.2024.105598

Feiyue Wang, Weixuan Li, Litian Wan, Long Yan, Zhisheng Xu

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Abstract

Nitrogen fire extinguishing system has a significant development space in the modern fire extinguishing because of its environmental protection, energy saving and high stability. To further broaden the application field of nitrogen fire extinguishing system, a shrinkage size model was used as the research object and combined with simulated flow field analysis. A nitrogen fire extinguishing system was characterized for alcohol fire extinguishing efficacy using nitrogen injection pressure as a variable and parameters such as extinguishing time, oxygen concentration, and temperature. Furthermore, diesel and gasoline were used as combustible materials to verify the extinguishing efficacy of pressure variation on Class B oil pool fires. It was found that with the increase of nitrogen injection pressure, the nitrogen extinguishing efficacy gradually increased and then leveled off in the confined space. The asphyxiating oxygen concentrations were 12.2 %, 13.2 % and 13.7 % for ethanol, diesel and gasoline, respectively. Asphyxiating oxygen concentration above limiting oxygen concentration (LOC). For extinguishing Class B oil pool fires in confined spaces, nitrogen extinguishing systems showed excellent fire extinguishing efficiency. They had specific application prospects in the field of protecting underground oil storage tanks and oil wells.

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氮气灭火系统压力变化下 B 型油池火灾密闭空间的窒息效应分析

氮气灭火系统因其环保、节能、高稳定性等特点，在现代灭火中具有重要的发展空间。为进一步拓宽氮气灭火系统的应用领域，以收缩尺寸模型为研究对象，结合模拟流场分析，对氮气灭火系统的酒精灭火效能进行了表征。以氮气喷射压力为变量，以灭火时间、氧气浓度和温度等参数为参数，对氮气灭火系统的酒精灭火效果进行了表征。此外，还以柴油和汽油为可燃物，验证了压力变化对 B 类油池火灾的灭火效果。结果发现，随着氮气喷射压力的增加，氮气灭火效能逐渐提高，然后在密闭空间内趋于平稳。乙醇、柴油和汽油的窒息氧浓度分别为 12.2%、13.2% 和 13.7%。窒息性氧浓度高于极限氧浓度 (LOC)。对于扑灭密闭空间中的 B 级油池火灾，氮气灭火系统显示出卓越的灭火效率。它们在保护地下储油罐和油井领域具有特殊的应用前景。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.