Experimental Investigation on Inerting Mechanism of Dust Explosion
Systematic experiments were carried out on explosions of coal dust-inertant mixtures.Explosion severity was gained by using Siwek 20 L vessel and factors strongly influencing inerting effectiveness,such as deflagration mechanism and inertant composition were taken into account.Tests of thermal-gravimetric analysis were conducted to identify the reaction mechanism of coal dust explosions.As a result,bituminous coal dust deflagrates via the homogeneous mechanism,while anthracite dust mainly features the mechanism of heterogeneous reaction.Results reveal that the inerting functional mechanisms are quite different for bituminous coal and anthracite dusts,and the homogeneous-combustion-dust is much easier to be inhibited than the heterogeneous-reaction-dust.Trends of higher inerting effectiveness are associated with better decomposability,more excellent performance of oxygen blocking.Moreover,the particular efficacy of free ammonia decomposed from monoammonium phosphate in flame extinguishing is identified.Added water shows the best inerting effectives due to particle aggregation induced by moisture,which gives the idea that humidification for coal dust is therefore a cost-effective approach for explosion prevention and mitigation.
Dust Explsion Inerting Homogeneous mechanism Heterogeneous mechanism
Bing Du Weixing Huang Niansheng Kuai Jingjie Yuan Zongshan Li Yuan Gan
School of Chemical Engineering, Sichuan University, Chengdu 610065, China
国际会议
2012 International Symposium on Safety Science and Engineering in China (2012安全科学与工程国际会议)
北京
英文
338-342
2012-11-07（万方平台首次上网日期，不代表论文的发表时间）