In order to effectively reduce the coal dust concentration in a fully mechanized mining face, this research used laboratory experiment, numerical simulation, and field test to conduct an in-depth exploration of the ejector precipitator installed at the low-level caving coal hydraulic support. Firstly, through the experimental platform in the laboratory, the dust removal effect of the nozzle with different structural parameters was tested, and the 3D particle dynamic analyzer was adopted to verify its atomization characteristics; then, the structural parameters corresponding to the nozzle in the best test results were obtained. Secondly, by using Fluent, the negative pressure flow field in the ejector barrel was numerically simulated. The results indicated that when the pressure of supply water was 12 MPa, the negative pressure value formed in the flow field was the lowest and the inspiratory velocity was the largest, which was conducive to dust removal. Finally, the tests of liquid–gas ratio and dust removal ratio were carried out in a fully mechanized mining face. The results showed that when the nozzle specification recommended by the experiment and the pressure of supply water recommended by the numerical simulation were used, the removal ratios of the total coal dust and the respirable coal dust were 89.5% and 91.0%, respectively, at the measuring point of the highest coal dust concentration. It indicates that the ejector precipitator has a good application effect in reducing the coal dust concentration in a fully mechanized mining face and improving the work environment of coal mine workers.

为了有效降低综采工作面的煤尘浓度，本研究通过室内实验，数值模拟和现场试验对安装在低放煤水压支架上的喷射除尘器进行了深入研究。首先，通过实验室的实验平台，测试了不同结构参数喷嘴的除尘效果，并采用3D粒子动力分析仪对其雾化特性进行了验证。然后，获得了最佳测试结果中与喷嘴相对应的结构参数。其次，通过使用Fluent，对喷射筒内的负压流场进行了数值模拟。结果表明，当供水压力为12 MPa时，流场内形成的负压值最低，吸气速度最大，有利于除尘。最后，在一个综采工作面进行了液气比和除尘率的测试。结果表明，采用实验推荐的喷嘴规格和数值模拟推荐的给水压力时，总煤尘和可吸入煤尘的去除率分别为89.5％和91.0％。最高粉尘浓度的测量点。这表明该喷射除尘器在降低综采工作面煤尘浓度，改善煤矿工人的工作环境方面具有良好的应用效果。