镁铝混合粉粉尘最低着火温度实验

Minimum ignition temperature experiment of magnesium aluminum mixed dust

为了研究镁铝混合粉中铝粉质量百分数对最低着火温度的影响,利用HY16429型粉尘云引燃温度试验装置和HY16430粉尘层最低着火温度实验装置测定镁铝混合粉的最低着火温度。研究结果表明:镁粉粒径为1~10 mm,铝粉粒径为200~300目,在粉尘质量0.5 g,喷尘压力60 k Pa条件下,镁粉尘云最低着火温度为575℃,镁粉尘层最低着火温度为300℃;铝粉尘云在1 000℃未着火,铝粉粉尘层最低着火温度为470℃;镁铝混合粉尘云最低着火温度比粉尘层最低着火温度高,粉尘层状态比粉尘云状态更容易着火。镁铝混合粉最低着火温度随着铝粉质量百分数的增加而升高。

To study the influence of aluminum dust mass percentage in magnesium aluminum dust mixture on the minimum ignition temperature, the minimum ignition temperature of magnesium aluminum dust mixture was experimentally studied by HY16429 type dust cloud ignition temperature testing device and HY16430 minimum ignition temperature of dust layer experiment device in this paper. The results showed that： minimum ignition temperature of magnesium dust cloud and magnesium dust layer were 575 ℃ and 300 ℃, respectively at the dust particle size of （ 1 - 10） ram; minimum ignition temperature of aluminum dust layer was 470 ℃, but the aluminum dust cloud was not ignited in 1 000 ℃, at the dust particle size of （200 -300 ） mesh; Minimum ignition temperature of magnesium aluminum mixed dust cloud was higher than that of the dust layer, and the state of dust layer was more easily to be ignited than the state of dust cloud. Minimum ignition temperature of magnesium aluminum powder mixed rised with the increase of aluminum powder quality percentage.