石松子粉尘爆炸危险性及抑爆研究

Hazards and Suppressions Research on Lycoposium Dust Explosion

为了研究粒径对石松子粉尘爆炸危险性的影响,采用Godbert-Greenwald(G-G)炉和20 L球爆炸装置对石松子粉尘云进行了试验,分析了粒径对爆炸特性的影响,并探讨了Si O2和NH4H2PO4对石松子粉的抑爆效果。结果表明:粒径越小的粉尘着火温度越低,潜在危险性更大;粒径小于48μm的粉尘,在质量浓度为750 g/m3时达到最大爆炸指数22.61 MPa·m/s,其爆炸危险性为Ⅱ级,相比于粒径小于75μm的粉尘,爆炸危险性更高;添加Si O2和NH4H2PO4后,能够显著降低石松子粉的爆炸压力和爆炸指数;与Si O2相比,NH4H2PO4具有更好的抑爆效果。

To investigate the influence of particle size on lycopodium dust explosion hazards, the dust explosions were experimentally studied using a Godbert-Greenwald （ G-G） furnace and a 20 L sphere explosion test unit, and the variation regularities of the explosion characteristic with the diameter of lycopodium were analyzed. Moreover,the effects of SiO2 and NH4 H2 PO4 on dust explosion suppression were also studied. The results indicate that the smaller the dust particle size, the lower the ignition temperature, and consequently the bigger thepotential hazards. Dust particle size in less than 48 μm at a mass concentration of 750 g/m3 results in a maximum explosion index of 22. 61 MPa·m/s, which ranks a gradeⅡexplo-sion in the risk classification exhibiting a higher grade of hazard in comparison the dust size less than 75 μm. Adding SiO2 and NH4 H2 PO4 can efficiently reduce lycopodium dust explosion pressure and explosion index, and the explosion sup-pression effects of NH4 H2 PO4 are better than that of SiO2 .