聚丙烯生产加工过程中产生的细微粉尘易引发燃烧爆炸事故。针对电火花和高温物体表面两种典型火源，采用粉尘云最小点火能试验装置、静电火花感度仪、粉尘云（层）最低着火温度实验装置分别对悬浮态和堆积态聚丙烯粉尘开展燃爆敏感性研究。结果表明：10~13、18~23、25~38 μm聚丙烯粉尘云的最小点火能远低于48~75 μm粉尘云，聚丙烯粉尘云的最小点火能随粉尘质量浓度、喷粉压力、点火延迟时间的增大整体呈现先降低后上升的变化趋势；堆积状态下，随着粒径的增加，聚丙烯粉尘最小点火能逐渐增大，即静电火花敏感度下降；单因素变量下，随着粒径的增大，聚丙烯粉尘云的最低着火温度因粉尘团聚现象而存在拐点。

During the production and processing of polypropylene, the fine dust generated is prone to combustion and explosion accidents. Targeting two typical ignition sources, electrical sparks and high-temperature surface objects, the study investigated the combustion sensitivity of suspended and accumulated polypropylene dust using a minimum ignition energy test apparatus for dust clouds, an electrostatic spark sensitivity tester, and a minimum ignition temperature test apparatus for dust clouds/layers. The results indicate that the minimum ignition energy of 10~13, 18~23, 25~38 μm polypropylene dust clouds is significantly lower than that of 48~75 μm dust clouds. The minimum ignition energy of polypropylene dust clouds shows a trend of first decreasing then increasing with the rise of dust concentration, powder injection pressure, and ignition delay time. In accumulated state, the minimum ignition energy gradually increases with particle size, indicating reduced electrostatic spark sensitivity. Under single-variable conditions, the minimum ignition temperature of polypropylene dust clouds displays inflection points with increasing particle size due to dust agglomeration phenomena.