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基于喷嘴雾化特性测定实验装置,对4种应用效果较优的实心圆锥形雾场喷嘴在2~8MPa喷雾压力时的宏观及细观雾化特性进行了测定.结果表明:随着喷雾压力增大,喷嘴的宏观雾化特性雾化角不断减小、射程不断增大,细观雾化特性雾滴粒径不断减小,在雾场中,雾滴粒径随距喷嘴轴向距离的增大而增大,随距横截面中心距离的减小而增大.结合现场及实验结果,优选了适于中短距离、大面积降尘且雾滴粒径较小的喷嘴Ⅲ为采煤机外喷雾喷嘴,并进行了现场试验.结果表明:随着喷雾压力增大,各测点的粉尘浓度、全尘与呼尘降尘率差值均不断减小,降尘率不断增大,喷雾压力为8MPa时雾化降尘效果最优,全尘、呼尘降尘率平均值分别为81.82%,79.96%.
Based on the experimental device for measuring the atomization characteristics of nozzles, the macroscopic and mesoscopic atomization characteristics of four kinds of solid conical nozzles with a spray pressure of 2 ~ 8MPa were measured. The results showed that with the increase of spray pressure Large, atomization characteristics of the nozzle The atomization angle is decreasing, the range is increasing, and the droplet size of the atomization characteristics is decreasing. In the fog field, the particle size of the droplet increases with the axial distance from the nozzle Bigger and larger, with the distance from the center of the cross-section decreases and increases.According to the scene and the experimental results, the selection of suitable for short-range, large area dust and droplet diameter smaller nozzles Ⅲ outside the shearer Spray nozzle and field test.The results show that with the increase of spray pressure, the dust concentration at each measuring point, the difference between the total dust and the dust dusting dust rate continuously decrease, the dust dusting rate continues to increase, the spray pressure is 8MPa At the same time, the effect of atomization and dust reduction is the best, and the average dust and dust dusting rates are 81.82% and 79.96% respectively.