HDPE粉尘云最小点火能试验研究

为研究高密度聚乙烯(HDPE)粉尘云燃爆的敏感性参数，采用粉尘云最小点火能（MIE）试验装置对HDPE 粉尘进行试验研究。首先研究3 个单一因素(粉尘粒径、粉尘云质量浓度和喷粉压力)对MIE 的影响，然后对一定条件下不同质量浓度的HDPE 粉尘云在哈特曼管中燃烧的火焰传播行为进行分析，最后采用正交试验法分析了多因素对MIE 的影响程度。试验结果表明：随着HDPE 粉尘粒径从25 μm 增加到120 μm，MIE 逐渐增大；随着HDPE 粉尘云质量浓度的增加，MIE 先降低后缓慢上升；随着喷粉压力从50 kPa 增加到400 kPa，MIE 呈现先降低后升高的趋势；粉尘云的质量浓度越大，其在哈特曼管中燃爆的剧烈程度越强，同时燃爆的延续时间也越长；粉尘粒径对MIE 的影响最为显著。

Experimental investigation of the minimum ignition energy of HDPE dust cloud

In order to study the explosion sensitivity parameters of high density polyethylene (HDPE) dust cloud, experimental research on HDPE dust was carried out. The MIE of HDPE dust cloud was tested by the minimum ignition energy test device. Firstly, the effects of three single factors (dust particle size, dust cloud mass concentration and dispersion pressure) on MIE were studied, and then the flame propagation behavior of HDPE dust clouds with different mass concentrations burning in Hartmann tube under certain conditions was analyzed. Finally, orthogonal experiment method was used to analyze the influence of multiple factors on MIE. The experimental results showed that: with the increase of dust particle size from 25 μm to 120 μm, the MIE increases gradually; with the increase of HDPE dust cloud mass concentration, the MIE decreases and then slowly rises. The MIE decreases first and then increases when dispersion pressure increases from 50 kPa to 400 kPa. The greater the mass concentration, the stronger the degree of intense combustion in the Hartmann tube, and the longer the presence time of the explosion. The dust particle size had the most significant influence on MIE.