The explosion characteristic parameters of polyethylene dust were systematically investigated. The variations in the maximum explosion pressure (P_max), explosion index (K_st), minimum ignition energy (MIE), minimum ignition temperature (MIT), and minimum explosion concentration (MEC) of dust samples with different particle sizes were obtained. Using experimental data, a two-dimensional matrix analysis method was applied to classify the dust explosion severity based on P_max and K_st. Then, a three-dimensional matrix was used to categorize the dust explosion sensitivity based on three factors: MIE, MIT, and MEC. Finally, a two-dimensional matrix model of dust explosion risk assessment was established considering the severity and sensitivity. The model was used to evaluate the explosion risk of polyethylene dust samples with different particle sizes. It was found that the risk level of dust explosion increased with decreasing particle size, which was consistent with the actual results. The risk assessment method can provide a scientific basis for dust explosion prevention in the production of polyethylene.

对聚乙烯粉尘的爆炸特性参数进行了系统的研究。获得了不同粒径粉尘样品的最大爆炸压力（P _max），爆炸指数（K _st），最小点火能量（MIE），最小点火温度（MIT）和最小爆炸浓度（MEC）的变化。利用实验数据，采用二维矩阵分析方法，基于P _max和K _st对粉尘爆炸的严重程度进行分类。。然后，使用三维矩阵基于三个因素对粉尘爆炸敏感性进行分类：MIE，MIT和MEC。最后，建立了考虑严重程度和敏感性的二维粉尘爆炸危险性评估矩阵模型。该模型用于评估不同粒径的聚乙烯粉尘样品的爆炸危险。结果表明，粉尘爆炸的危险程度随粒径的减小而增加，与实际结果相符。该风险评估方法可为聚乙烯生产中的粉尘爆炸预防提供科学依据。