煤矿井下气水喷雾雾化效果实验研究及应用

Experimental research and application of atomization effect of gas-water spray in underground coal mine

为了研究气水喷嘴内部结构参数对雾化性能的影响,基于自行搭建的试验平台,以及多普勒激光雾粒测数仪来分析不同结构参数喷嘴的雾化特性,并进行现场试验验证。研究得出:在水压一定时,随着供气压力的增加,喷嘴的3个关键内部结构参数尺寸与耗气量、射程成逐渐增加;压气喷嘴空气帽直径直径越大,喷雾雾化后粒径尺寸越大,粒径分布范围越广,小尺寸粒径占比越小;同时,在空气帽直径一定时,适当增加气道和水道直径能优化雾化效果。将试验结果中雾化效果最好的喷嘴4进行煤矿井下现场试验,得出在顺逆风割煤时,下风侧司机处与采煤机下风侧15~20 m处降尘效率分别为61%、62%、62%、63%,表现出较好的降尘效果。

In order to study the influence of the internal structural parameters of the gas-water nozzle on the atomization performance,the atomization characteristics of the nozzles with different structural parameters were analyzed based on the self-built test platform and the Doppler laser fog particle counter,and field test verification was carried out.The research shows that when the water pressure is constant,with the increase of the air supply pressure,the size of the three key internal structural parameters of the nozzle and the air consumption,and the range of the nozzle gradually increase;the larger the diameter,the wider the range of particle size distribution,and the smaller the proportion of small-sized particles.At the same time,when the diameter of the air cap is constant,appropriately increasing the diameter of the air passage and water passage can optimize the atomization effect;the 4#nozzle with the best atomization effect in the test results is carried out in the underground coal mine field test,and it is concluded that the dust reduction efficiency at the side of the driver and 15 m to 20 m on the downwind side of the shearer is 61%,62%,62%,and 63%respectively,showing good dust reduction effects.