锰金属粉尘最小点火能量实验研究

Experimental Research on Minimum Ignition Energy of Manganese Dust

为了研究锰金属粉尘的最小点火能,在实验室湿度为40~60%、温度为20~32℃的条件下,以粒径范围1.13~138um的锰粉为研究对象,利用1.2L哈特曼实验装置对锰粉进行最小点火能实验。结果表明:在设定锰粉质量为0.6g,喷涂压力为100kPa时,进行不同点火延迟时间对锰粉尘云最小点火能影响实验,锰粉尘云的最小点火能随着点火延迟时间的增加呈现先降低后增大的趋势;在设定质量浓度为0.836g/L及点火延迟时间为100ms时,进行不同喷涂压力对锰粉尘云最小点火能影响实验,锰粉尘云的最小点火能随着喷涂压力的增加呈现先降低后增大的趋势,400kPa为锰粉尘云的最佳分散压力值;进行不同质量浓度的锰粉对锰粉尘云最小点火能影响实验,设定喷涂压力300kPa及点火延迟时间100ms时,锰粉尘云的最小点火能随着粉尘质量浓度的增加呈现先降低后增大的趋势,锰粉云燃烧爆炸的最敏感浓度在1~1.25g/L之间。

In order to study the minimum ignition energy of manganese metal dust,under the condition of laboratory humidity of 40~60%and temperature of 20~32℃,1.2L Hartmann experiment device is used to conduct the minimum ignition energy experiment of manganese powder with particle size range of 1.13~138um as the research object.The results show that when the mass of manganese powder is set at 0.6g and the spraying pressure is 100kPa,the influence of different ignition delay times on the minimum ignition energy of manganese dust cloud is tested.The minimum ignition energy of manganese dust cloud decreases first and then increases with the increase of ignition delay time.When the mass concentration is set at 0.836g/L and the ignition delay time is set at 100ms,the influence of different spraying pressures on the minimum ignition energy of manganese dust cloud is tested.The minimum ignition energy of manganese dust cloud first decreases and then increases with the increase of spraying pressure.400kPa is the best dispersion pressure value for manganese dust cloud.When spraying pressure is set at 300kPa and ignition delay time is set at 100ms,the minimum ignition energy of manganese dust cloud decreases first and then increases with the increase of dust mass concentration.The most sensitive concentration of manganese dust cloud combustion explosion is between 1g/L and 1.25g/L.