Experimental and numerical study on dust dispersion characteristics during moving dust source processes
摘要
The transfer and transportation of bulk materials is common in industrial production, which can realize automation and efficient production. However, this process has become a major source of dust pollution in the production environment, which seriously threatens the health of workers and hidden safety production hazards. The dust source of the bulk material transferring and conveying process has a certain velocity, and the dust pollution formed belongs to the problem of moving dust source. Based on this, this paper establishes a dust fugitive model of mobile dust source through wind tunnel laboratory. The effects of moving velocity, air velocity and particle size on dust dispersion are analyzed by experimental and numerical methods, and the dust initiation rate is introduced to evaluate the dust initiation intensity. The results show that the difference between the air velocity and the set air velocity near the dust source increases with the increase of the set air velocity, and the deviation rate of the velocity is in the range of 8% to 13%. The mass loss of the moving dust source increases with the increase of the air velocity, and the peak value of the dust initiation rate increases as well; When the moving velocity of the dust source increases from 0.15 m/s to 0.3 m/s, the mass loss decreases from 13.89 g to 9.87 g. The dust initiation rate decreases with the increase of the moving velocity of the dust source, and when the moving velocity is 0.15 m/s there is a maximum dust initiation rate of 5.79 × 10− 4s. These results provide quantitative insights into the dynamics of moving-source dust dispersion, supporting the design of targeted control strategies in industrial settings.