Selecting a suitable flame-retardant powder is essential for preventing or reducing the risk of aluminium dust cloud explosions. Two types of retardant materials were studied, namely ABC powder (a flame-retardant powder mainly composed of ammonium dihydrogen phosphate dry powder) and melamine pyrophosphate powder (MPP). A specially designed rectangular pipe was used to examine the influences and mass fractions of the aforementioned flame retardants and the effects of compounds on maximum explosion pressure and maximum explosion pressure rate of increase. The results showed that the explosion-suppression effects of MPP powder were superior to those of ABC powder. Furthermore, the suppression effects of combining ABC and MPP to form compounds in various ratios were explored. The explosion-suppression effects of the single flame-retardant powders and flame-retardant powder compound were compared, which revealed that the effects of the flame-retardant compound were intermediate to those of ABC and MPP used separately. No synergistic effect was observed in the compound retardant. However, component mass fractions influenced the retardant properties of the compound. The suppression mechanism was investigated through thermal analysis, which revealed that the decomposition of the two flame-retardant powders was an endothermic process that generated inert gas. The addition of flame-retardant powder delayed the time required by aluminium to break through its oxide film. However, the thermal analysis curve of the compound overlapped those of the two single powders, and no new chemical reaction occurred. Thus, no change was observed in the efficacy of the flame-retardant properties.

选择合适的阻燃粉对于防止或减少铝尘云爆炸的风险至关重要。研究了两种类型的阻燃材料，即ABC粉（一种主要由磷酸二氢铵干粉组成的阻燃粉）和三聚氰胺焦磷酸盐（MPP）。使用专门设计的矩形管检查上述阻燃剂的影响和质量分数，以及化合物对最大爆炸压力和最大爆炸压力增加率的影响。结果表明，MPP粉体的爆炸抑制作用优于ABC粉体。此外，还探讨了将ABC和MPP结合以各种比例形成化合物的抑制作用。比较了单一阻燃粉和阻燃粉复合材料的抑爆效果，发现该阻燃粉的效果比单独使用的ABC和MPP中等。在复合阻燃剂中未观察到协同作用。但是，组分的质量分数影响了该化合物的阻燃性能。通过热分析研究了抑制机理，发现两种阻燃粉末的分解是吸热过程，产生惰性气体。阻燃粉的添加延迟了铝突破其氧化膜所需的时间。然而，该化合物的热分析曲线与两种单一粉末的热分析曲线重叠，并且没有发生新的化学反应。从而，