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为有效降低矿井工作场所粉尘浓度,提高雾化水源利用率,基于对雾化捕尘机理的分析,在自建试验系统内,以1.7 MHz超声波作为雾化动力源,将蒸馏水雾化为超细水雾,对双鸭山某矿三分之一焦煤煤样进行了雾化降尘试验。在分别完成1 min、2 min和5 min的雾化作用后,立即测量试验系统内的粉尘质量浓度,每5 min测量1次。绘制和分析各组试验数据所对应的回归方程,并以试验系统内无雾化煤尘自沉降试验数据作为对比。结果表明:超声波雾化作用能加速煤尘沉降,对降低试验系统内的残余粉尘浓度作用明显;雾化时间为1min、2 min和5 min时初次采样点的雾化降尘率分别为10.11%、12.73%和30.95%;粉尘沉降速率随时间延长而降低,但粉尘不能完全沉降;雾化时间与试验系统内的残余粉尘质量浓度负相关,雾化作用5 min的残余质量浓度最低为自沉降残余质量浓度的30.6%。
In order to effectively reduce the concentration of dust in the mine workplace and improve the utilization rate of atomized water, based on the analysis of atomization dust catching mechanism, 1.7 MHz ultrasonic wave was used as atomization power source in self-built test system to atomize distilled water into ultrafine Water mist, Shuangyashan a mine coking coal sample of one atomized dust test. Immediately after atomization for 1 min, 2 min and 5 min respectively, the dust mass concentration in the test system was measured and measured every 5 min. Draw and analyze the regression equation corresponding to each group of test data, and take the test data of no-atomized coal dust self-settling in the test system as a comparison. The results show that ultrasonic atomization can accelerate the dust settling and reduce the residual dust concentration in the test system. The atomization and dust reduction rates of the initial sampling points are 10.11%, 1 min, 2 min and 5 min respectively, 12.73% and 30.95% respectively. The dust deposition rate decreased with time, but the dust could not completely settle. The atomization time was negatively correlated with the residual dust concentration in the test system. The lowest residual mass concentration after 5 min atomization was the self-settling residue Mass concentration of 30.6%.