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为研究携煤尘高压气流诱导沉积煤粉联合爆炸的火焰特性,采用水平玻璃管煤尘爆炸试验装置,分别对褐煤、长焰煤、不粘煤、气煤等4种煤尘的联合爆炸火焰传播最远距离l和火焰持续时间t等2项火焰特性展开试验分析,并研究沉积煤粉质量m、沉积煤粉粒径r、沉积煤粉中混入CaCO_3岩粉量k对联合爆炸火焰特性的影响。结果表明:随m在0~4.5 g范围内增大,4种煤尘l和t先增大后减小,l和t达到局部极值后减小。4种煤尘的l均随r的增大缓慢减小,且分别在r为26、26、26和38μm时,l依次达最大值106、73、37和22 cm。t_3和t_4随r的增大而增大,甚至当r大于40μm时亦如此。k为6 g时,褐煤、长焰煤l抑制效率分别为62.5%和79.7%,而不粘煤与气煤均不再爆炸。
In order to study the flame characteristics of combined explosion of coal dust induced by high-pressured coal dust flow, a horizontal glass tube coal-dust explosion test apparatus was used to test the joint explosion flame of four coal dusts, such as lignite, long flame coal, Propagation of the l and the flame the longest flame duration t two flame test and analysis of the development and study of the quality of sediment pulverized coal m, sediment pulverized coal particle size r, the mixed coal powder mixed with CaCO_3 k powder flame characteristics of the joint explosion influences. The results show that with the increase of m in the range of 0-4.5 g, the four kinds of coal dust l and t first increase and then decrease, and l and t reach the local maximum and then decrease. The four kinds of coal dust l with the increase of r slowly decreases, and respectively r at 26,26,26 and 38μm, l followed by the maximum 106,73,37 and 22 cm. t_3 and t_4 increase with increasing r, even when r is greater than 40 μm. When k is 6 g, the inhibition efficiency of lignite and long-flame coal l is 62.5% and 79.7% respectively, while the non-stick coal and gas coal no longer explode.