Study on dust control technology and parameters for a coal washing plant screening workshop based on CFD technology of positive-negative pressure dust removal systems

Large quantities of coal dust are generated during coal screening processes, which spread to the surrounding environment and severely affect air quality and employees' health. Here, we investigated the effectiveness of a self-developed positive- and negative-pressure composite dust removal system in controlling dust pollution in a coal preparation plant screening workshop. The dispersion law of dust pollution under two conditions, with and without this device, was numerically simulated. We then conducted orthogonal experiments to select the optimal position and air volume of the dust removal system device. The research findings indicate that without this system, dust pollution is severe, with an average dust concentration in the breathing zone reaching 86.8 mg/m3, 3 , posing a serious threat to workers' safety. After optimizing the dust removal system, the average dust concentration in the breathing zone reduced to 18.4 mg/m(3), improving dust removal efficiency by 78.7 % compared to the original condition.