Nam Ki-Hun, Park Jung Kyu, Lee Jun-Sik
Department of Fire and Disaster Prevention Engineering, Changshin University, Changwon-si, Korea.
Department of Computer Engineering, Daejin University, Pocheon-si, Korea.
PLoS One. 2024 Sep 16;19(9):e0310185. doi: 10.1371/journal.pone.0310185. eCollection 2024.
Magnesium is a combustible metal that poses various safety risks, including fires and explosions. However, there are limited safety measures available to prevent and respond to potential fires and explosion incidents in the metal industry. In this study, the combustion process of Mg fires was closely examined using infrared thermal imaging, focusing on the effects of Mg powder size. For the experiment, Mg powder was burned by increasing the temperature to approximately 967.4 K using an ignition unit and controller equipped with a tungsten heater. Moreover, combustion velocity measurement experiments for Mg particle sizes of 75, 100, and 150 μm were conducted using the combustion velocity measurement device presented in the NFPA 484 standard. On combustion of Mg, flames are observed; smoke is emitted as demonstrated by thermal and flow visualization experiments. The combustion velocity measurement experiment results demonstrated that the greater the slope value (combustion velocity) for the combustion length over time, the faster is the combustion velocity, with the 75 μm particle size having the fastest combustion velocity. The results of this experiment can be utilized as references for Mg fire control design and to gain a better understanding of the scope of smoke and fire hazard investigation measures.
镁是一种可燃金属，存在各种安全风险，包括火灾和爆炸。然而，在金属行业中，可用于预防和应对潜在火灾及爆炸事故的安全措施有限。在本研究中，使用红外热成像技术对镁火灾的燃烧过程进行了密切研究，重点关注镁粉粒度的影响。在实验中，使用配备钨加热器的点火装置和控制器将温度升高至约967.4 K来燃烧镁粉。此外，使用NFPA 484标准中提出的燃烧速度测量装置对75、100和150μm粒径的镁颗粒进行了燃烧速度测量实验。镁燃烧时会观察到火焰；热成像和流动可视化实验表明会有烟雾排放。燃烧速度测量实验结果表明，燃烧长度随时间的斜率值（燃烧速度）越大，燃烧速度越快，其中75μm粒径的燃烧速度最快。该实验结果可作为镁火灾控制设计的参考，并有助于更好地了解烟雾和火灾危害调查措施的范围。
