镁铝合金粉最低着火温度的实验测试

Experimental study on minimum ignition temperature of Aluminium Magnesium alloy powder

为评价铗铝合金粉着火危险性并保证安全生产,采用Godbert-Greenwald恒温炉装置测试了粉尘浓度、分散压力及惰性介质碳酸钙对镁铝合金粉最低着火温度的影响.结果表明：镁铝舍金粉最低着火温度随粉尘质量浓度的增加而降低,粉尘质量浓度为1 364 g/m3时最低着火温度最小,为615℃;粉尘质量恒定为300mg、分散压力在0.02～0.05 MPa变化时,最低着火温度不同.压力为0.03 MPa时最有利于粉尘燃烧,最低着火温度值最小.镁铝合金粉最低着火温度随着碳酸钙质量分数的增加而逐渐升高,当碳酸钙质量分数大于52.4％时能显著抑制镁铝合金粉燃烧,粉尘最低着火温度明显升高.

To evaluate the explosion hazard of Magnesium alloy powder and ensure safety in production, Godbert-Greenwald furnace apparatus was used to study the influence of dust concentration, diffusing pressure and Calcium Carbonate on the minimum ignition temperature （MIT） of Aluminium Magnesium alloy powder. Experimental results show that： the minimum ignition temperature of Aluminium Magnesium alloy powder decreases with the increasing of dust concentration, the lowest value of MIT is 615 ℃ when the dust concentration is 1 364 g/ m3 ;the powder mass was fixed to 300 mg, the MIT of Aluminium Magnesium alloy powder changes with the increasing of dif- fusing pressure from 0. 02 MPa to 0. 05 MPa, and when the pressure is 0. 03 MPa, it is the most conductive for the dust combustion with the lowest MIT; the MIT of Aluminium Magnesium alloy powder increases with the increasing of Calcium Carbonate mass fraction, also, when the mass fraction of Calcium Carbonate is greater than 52.4%, Calcium Carbonate can inhibit dust combustion significantly and the MIT of Aluminium Magnesium alloy powder increases obvious.