不同灭火剂对热失控后锂离子电池排出气体火灾的抑制效果:综合实验和数值研究

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL
Shilin Wang , Xu Gong , Ruihua Shao , Lejun Xu , Yitong Li , Fenfen He , Qinzheng Wang , Xi Wang , Huaibin Wang , Chengshan Xu , Xuning Feng
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引用次数: 0

摘要

在锂离子电池的热失控过程中,汽化的电解质和可燃气体的释放会导致喷射火焰的形成,从而带来巨大的火灾或爆炸风险。为了应对锂离子电池放空气体火灾对储能电站安全的威胁,确定锂离子电池系统的有效灭火剂至关重要。本研究采用实验和数值模拟相结合的方法,评估了 CO2、N2 和 HFC-227ea 对来自不同正极材料锂离子电池的放空气体/空气预混合火焰的抑制能力。在环境温度和大气压力条件下,使用本生灯装置测量了特定当量比的放空气体/空气/灭火剂预混合火焰的层状火焰速度。此外,还使用 CHEMKIN-Pro 对层流火焰速度和绝热火焰温度进行了数值计算,并对 HFC-227ea 的化学抑制机制进行了分析。研究结果表明,虽然 HFC-227ea 在较低当量比时可能会略微升高绝热火焰温度,但其总体灭火效果超过了 CO2 和 N2。这些结果为储能电站选择合适的灭火剂提供了宝贵的启示,从而提高了储能系统的安全标准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Suppression effects of different extinguishing agents on vent gases fires from lithium-ion batteries after thermal runaway: A comprehensive experimental and numerical study

During the thermal runaway process of lithium-ion batteries, the release of vaporized electrolyte and combustible gases can lead to the formation of a jet flame, posing a significant fire or explosion risk. In order to deal with the threat of lithium-ion battery vent gas fires to the safety of energy storage power stations, it's crucial to identify effective fire extinguishing agents for lithium-ion battery systems. This study employs a combination of experimental and numerical simulation methods to assess the suppression capabilities of CO2, N2, and HFC-227ea on vent gas/air premixed flames originating from lithium-ion batteries with various cathode materials. Laminar flame speed of vent gas/air/extinguishing agent premixed flames at specific equivalence ratios were measured using a Bunsen burner device under ambient temperature and atmospheric pressure conditions. Additionally, numerical calculations of laminar flame speed and adiabatic flame temperature were conducted using CHEMKIN-Pro, accompanied by an analysis of the chemical inhibition mechanism of HFC-227ea. The findings reveal that although HFC-227ea may slightly elevate the adiabatic flame temperature at lower equivalence ratios, its overall fire extinguishing efficacy surpasses that of CO2 and N2. These results offer valuable insights for selecting appropriate fire extinguishing agents for energy storage power stations, thereby enhancing the safety standards of energy storage systems.

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来源期刊
Fire Safety Journal
Fire Safety Journal 工程技术-材料科学:综合
CiteScore
5.70
自引率
9.70%
发文量
153
审稿时长
60 days
期刊介绍: Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.
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