硬脂酸粉着火敏感性影响因素及惰化研究*

为预防和减轻硬脂酸粉加工、储存和运输过程中的燃爆危害，采用Godbert-Greenwald恒温炉分别研究质量浓度、分散压力、惰性粉体质量分数对硬脂酸粉尘云最低着火温度的影响规律。研究结果表明:硬脂酸粉尘云的最低着火温度随质量浓度和分散压力的增加先减小后增大，当质量浓度和分散压力分别为485.4 g/m3，15 kPa时，硬脂酸粉尘云最低着火温度达到最小；添加少量惰性粉体增大了硬脂酸粉尘云分散性，对硬脂酸粉尘云最低着火温度的降低起到促进作用；随惰性粉体质量分数的增加，硬脂酸粉尘云最低着火温度先迅速增大后增速变缓；SiO2通过物理作用抑制硬脂酸粉尘云燃烧，Al(OH)3除物理作用外还通过化学分解参与自由基碰撞，可有效提升硬脂酸粉尘云的最低着火温度。

Study on influencing factors of ignition sensitivity and inerting of stearic acid dust

In order to prevent and mitigate the deflagration hazard during the processing,storage and transportation processes of stearic acid dust,the Godbert-Greenwald constant temperature furnace was used to study the influence of mass concentration,dispersive pressure and mass fraction of inert dust on the minimum ignition temperature of stearic acid dust cloud,respectively.The results showed that the minimum ignition temperature of stearic acid dust cloud decreased first and then increased with the increase of mass concentration and dispersive pressure,and when the mass concentration and dispersive pressure were 485.4 g/m3 and 15 kPa respectively,the minimum ignition temperature of stearic acid dust cloud reached the minimum value.Adding a small amount of inert dust increased the dispersibility of stearic acid dust cloud and promoted the minimum ignition temperature of stearic acid dust cloud.As the mass fraction of inert dust increased,the minimum ignition temperature of stearic acid dust cloud increased rapidly first and then increased slowly.The SiO2 inhibited the combustion of stearic acid dust cloud through physical effect.In addition to physical effect,the Al(OH)3 participated in the free radical collision through chemical decomposition,which increased the minimum ignition temperature of stearic acid dust cloud effectively.