A pneumatic conveying powder device was carried out to investigate the fire-extinguishing performance of cement powder against metal magnesium fire. The fire suppression test shows that pneumatic conveying can effectively transport cement powder to the combustion area for suppressing metal magnesium fire, and the fire-extinguishing time increases with the fire load of metal magnesium. The fire suppression effect of cement powder in metal magnesium fire is ascribed to the formation of a thermally insulation layer as physical barrier concomitant with heat absorption during pyrolysis process that effectively weaken the heat transfer and reduces the combustion intensity, as supported by the morphology and DSC analysis. The results of explosion suppression test reveal that cement powder has a significant inhibitory effect on reducing the explosion max-pressure and max-pressure rise rate of methane explosion, exhibiting a high-level security in the fire-extinguishing process. This work provides an effective and safe strategy for extinguishing metal magnesium fires.

采用气力输送粉体装置研究水泥粉体对金属镁火灾的灭火性能。灭火试验表明，气力输送能有效地将水泥粉输送到燃烧区抑制金属镁火灾，灭火时间随着金属镁火灾负荷的增加而增加。水泥粉末在金属镁火灾中的灭火效果归因于在热解过程中形成的隔热层作为物理屏障，伴随着热量的吸收，有效地削弱了传热并降低了燃烧强度，这由形貌和 DSC 支持。分析。抑爆试验结果表明，水泥粉对降低甲烷爆炸的爆炸最大压力和最大压力上升率具有显着的抑制作用，在灭火过程中表现出较高的安全性。这项工作为扑灭金属镁火灾提供了一种有效且安全的策略。