微米级硅粉粉尘爆炸特性及抑爆试验研究

Experimental study on explosion characteristics and explosion suppression of micron silicon dust

为了减少硅加工行业粉尘爆炸事故,以硅粉为试验对象,采用20 L球形爆炸测试系统,对硅粉的爆炸特性和不同影响因素对爆炸特性的影响进行研究,并选取两种惰性介质探究其对硅粉尘爆炸的抑制效果。试验结果表明:在一定质量浓度范围内,硅粉尘云的最大爆炸压力随质量浓度的升高先增大后减小。硅粉尘云的爆炸下限浓度为80~90 g/m^3,最大爆炸压力在粉尘质量浓度为750 g/m^3时达到峰值0.798 MPa,爆炸指数在500g/m^3时取得最大值40.72 MPa·m/s,且硅粉的爆炸危险性达St3级。NH4H2PO4对于硅粉尘爆炸的惰化效力较SiO2更强,且当其质量分数达80%时完全抑制硅粉发生爆炸。

In order to reduce dust explosion accidents in silicon processing industry, with silicon powder as the test object, 20 L spherical explosive device was used to research the explosion characteristics of silicon dust and the influence of different factors on the explosion.Two kinds of inert medium was used to explore its suppression effect on silicon dust explosion. The results showed that in certain concentration range, the maximum explosion pressure of silicon dust cloud increases firstly and decreases thereafter when increasing the dust concentration. The lower explosive limit concentration of silica dust cloud is 80 to 90 g/m^3, and the maximum explosion pressure reaches 0.798 MPa when the dust concentration is 750 g/m^3. The maximum explosion index is 40.72 MPa·m/s when the dust concentration is 500 g/m^3 and the explosion risk of silicon dust reaches St3 level. NH4 H2 PO4 has a stronger inerting effect on silica dust explosion than SiO2, and will completely inhibits the explosion of silica powder when its mass fraction reaches 80%.