镁粉尘云最低着火温度及抑制技术的实验研究

发布时间：2018-05-06 10:28

  本文选题：镁粉尘云 + 最低着火温度　； 参考：《科学技术与工程》2015年16期

【摘要】：为评价镁粉着火燃烧危险性及惰性粉体对镁粉着火燃烧的抑制作用,采用Godbert-Greenwald恒温炉装置研究了喷粉压力、浓度、粒径及惰性粉体Ca CO3、Si O2对镁粉尘云最低着火温度的影响。结果表明:喷粉压力为0.03 MPa时,最有利于镁粉着火燃烧;镁粉尘云的最低着火温度随浓度的增加而降低,存在最小危险浓度,5.45 kg/m3;高于此浓度,镁粉尘云的最低着火温度几乎不变;镁粉粒径减小,其最低着火温度降低;镁粉尘云最低着火温度随Ca CO3、Si O2含量的增加而先升高后趋于稳定;惰性粉体浓度低于52%时,Ca CO3的抑制效果强于Si O2;高于52%时,Si O2的抑制效果强于Ca CO3;当炉体温度高于630℃时,Ca CO3与Si O2对镁粉的抑制效果较弱。
[Abstract]:In order to evaluate the danger of ignition and combustion of magnesium powder and the inhibition effect of inert powder on ignition combustion of magnesium powder, the effects of powder injection pressure, concentration, particle size and inert powder Ca CO _ 3 / Sio _ 2 on the minimum ignition temperature of magnesium dust cloud were studied by Godbert-Greenwald constant temperature furnace. The results show that when the injection pressure is 0.03 MPa, the ignition temperature of magnesium dust cloud decreases with the increase of concentration, and the minimum dangerous concentration is 5.45 kg / m ~ 3, which is higher than this concentration. The minimum ignition temperature of magnesium dust cloud is almost unchanged, the minimum ignition temperature of magnesium dust cloud decreases and the minimum ignition temperature of magnesium dust cloud decreases with the increase of the content of Ca CO _ 3 / Sio _ 2, and then tends to be stable with the increase of Ca _ (CO _ 3) O _ (3) Sio _ 2 content. When the concentration of inert powder is lower than 52 鈩，

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