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为研究糖粉粉尘爆炸特性,采用20 L球形爆炸装置进行试验测试,通过改变糖粉粒径来测定粉尘爆炸下限质量浓度(LEL)、爆炸压力以及爆炸指数特性参数,研究粒径对糖粉爆炸特性的影响。结果表明,随着粒径的减小,粉尘LEL先由70~80 g/m3降低到0~10 g/m3,再上升到20~30 g/m3;爆炸压力由0.75 MPa增大到1.07 MPa;爆炸指数由11.2 MPa·m/s增大到23.4 MPa·m/s。此外,粒径为45~53μm的3号粉尘的LEL为0~10 g/m3,其爆炸敏感度最高;而粒径小于等于45μm的4号粉尘的爆炸压力为1.07 MPa,爆炸指数为23.4 MPa·m/s,其爆炸烈度最大。随着粒径的减小,糖粉粉尘的爆炸烈度单调性增大。
In order to study the characteristics of powdered dedust explosion, a 20 L spherical explosive device was used to test and test the LEL, explosion pressure and explosive index parameters by changing the particle size of the powdered sugar. Effect of characteristics. The results showed that with the decrease of particle size, the LEL of dust decreased from 70 ~ 80 g / m3 to 0 ~ 10 g / m3 and then increased to 20 ~ 30 g / m3. The explosion pressure increased from 0.75 MPa to 1.07 MPa The explosion index increased from 11.2 MPa · m / s to 23.4 MPa · m / s. In addition, the No. 3 dust with particle size of 45 ~ 53μm had the highest explosion sensibility for the LEL of 0 ~ 10g / m3, while the dust pressure of No. 4 with the particle size of 45μm or less was 1.07 MPa and the explosion index was 23.4 MPa · M / s, the maximum explosion intensity. As the particle size decreases, the explosive monotonicity of the powdered sugar dust increases.