HDPE粉尘一次及二次爆炸特性研究

Study on the First and Secondary Explosion Characteristics of HDPE Dust

为研究高密度聚乙烯(HDPE)粉尘的爆炸特性,采用20 L球粉尘爆炸装置,对5种不同粒径的HDPE粉尘进行实验,分析粉尘质量浓度、喷粉压力和粒径大小对HDPE粉尘一次爆炸与二次爆炸最大爆炸压力及其上升速率的影响,并对两者进行了对比分析。结果表明:随着粉尘质量浓度从225 g·m^(-3)增加到375 g·m^(-3),HDPE粉尘一次和二次爆炸的最大爆炸压力及其上升速率均先增大后减小;随着粉尘粒径从18μm增加到75μm,HDPE粉尘一次和二次爆炸的最大爆炸压力及其上升速率同样先增大后减小;随着喷粉压力从0.5MPa增加到3.0 MPa,HDPE粉尘一次和二次爆炸的最大爆炸压力及其上升速率均先降低后上升;HDPE粉尘二次爆炸最大爆炸压力及其上升速率与一次爆炸时相比均较小。

In order to study the explosion characteristics of HDPE dust, 20 L spherical dust explosion equipment was used to carry out the experiment of five kinds of HDPE dust with different particle sizes, and the effect of dust mass concentration, dispersion pressure and particle size on HDPE dust first and secondary explosion maximum explosion pressure and its rising rate was analyzed, and the two in the first and secondary explosion were compared and analyzed. The results showed that with the increase of dust mass concentration from 225 g·m^(-3) to 375 g·m^(-3), the maximum explosion pressure and its rising rate of HDPE dust first and secondary explosion increased first and then decreased;and with the increase of dust particle size from 18μm to 75 μm, the maximμm explosion pressure and its rising rate of HDPE dust first and secondary explosion also increased first and then decreased;and with the dispersion pressure increased from 0.5 MPa to 3.0 MPa, the maximμm explosion pressure and its rising rate of HDPE dust first and secondary explosion reduced first and then increased. The maximμm explosion pressure and the rise rate of maximμm explosion pressure of secondary explosion of HDPE dust was smaller than that of the first explosion.