Abstract: 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.

Key words: high density polyethylene, the minimum ignition energy, orthogonal experiment, dust particle size, dust cloud mass concentration, dispersion pressure