To assess the inhibitory effect and mechanism of Al(OH)₃ powder on the flame propagation from a polyethylene dust explosion, tests were conducted in a vertical transparent tube. The results show that the addition of Al(OH)₃ powder has a significant effect on the polyethylene dust explosion flame structure and propagation characteristics. With increasing mass ratio of Al(OH)₃ powder, the polyethylene dust explosion flame brightness decreases, the flame propagation velocity decreases, and pulsation of the flame during propagation diminishes. The Al(OH)₃ powder destroys the continuity of the structure of a polyethylene dust explosion flame, and retards the acceleration of flame propagation. The thermal weight loss of the polyethylene gradually decreased with increasing addition of Al(OH)₃ powder. Al(OH)₃ powder can retard the characteristic temperature of severe heat release from polyethylene. The cumulative heat release gradually decreases with the increasing amount of Al(OH)₃ powder. Al(OH)₃ powder can inhibit flame propagation of polyethylene dust explosion through physical effects such as cooling, heat insulation, and suffocation. This work is of significance for the prevention and treatment of polyethylene dust explosion accidents.

为了评估 Al(OH) ₃粉末对聚乙烯粉尘爆炸火焰传播的抑制作用和机制，在垂直透明管中进行了测试。结果表明，Al(OH) ₃粉体的加入对聚乙烯粉尘爆炸火焰结构和传播特性有显着影响。随着Al(OH) ₃粉体质量比的增加，聚乙烯粉尘爆炸火焰亮度降低，火焰传播速度降低，传播过程中火焰脉动减弱。Al(OH) ₃粉末破坏了聚乙烯粉尘爆炸火焰结构的连续性，阻碍了火焰传播的加速。随着Al(OH) ₃粉末添加量的增加，聚乙烯的热失重逐渐降低。Al(OH) ₃粉末可以延缓聚乙烯剧烈放热的特征温度。随着Al(OH) ₃粉末用量的增加，累积放热量逐渐降低。Al(OH) ₃粉末可以通过冷却、隔热、窒息等物理作用抑制聚乙烯粉尘爆炸的火焰传播。这项工作对预防和处理聚乙烯粉尘爆炸事故具有重要意义。