Abstract: In response to the problems of high toxicity, strong diffusion, and incomplete recovery function of volatile pollutants generated during ship spraying operations, this paper studies a vacuum recovery device with a double-layer recovery hood. The device includes a key vacuum pipeline for recovering paint mist, which utilizes negative pressure to recover toxic paint mist particles in a suitable area without damaging the shape of the jet. Theoretical calculations were conducted on the motion and force of paint mist particles, and a preliminary design was carried out for the structure of the double-layer recovery hood, as well as the selection of a suitable fan. The deformable parts model (DPM) algorithm in computational fluid dynamics (CFD) numerical simulation was used to simulate the motion of paint mist particles in a vacuum environment. Through numerical simulation calculations, it is determined that the optimal design scheme is a double-layer recovery hood with an axial length of ___. 500 mm and a vacuum pipeline to spray surface of 100 mm. The simulation results also indicate that different control variables, such as paint mist particle diameter, spray angle, spray velocity, and vacuum pipeline pumping speed, all have an impact on paint mist particle recovery. Increasing the spray angle, spray velocity, and vacuum pipeline pumping speed can achieve better recovery results. A spray angle of around $ 65^{\circ} $ is the optimal value. The vacuum recovery method can remove the vast majority of paint mist particles larger than 0.01 mm. Paint mist particles shatter after collision. The quadratic random fragmentation model was used to simulate the fragmentation of paint mist particles, and it was found that a large amount of mist was generated after the fragmentation of paint mist particles. The fan airflow could be appropriately increased to quickly remove it. Finally, the optimization results of the simulation calculation were verified through experiments, and the simulated values agreed well with the experimental data. This study can serve as a reference for the subsequent optimization design of paint mist recovery devices.
Keywords: paint spraying; vacuum recovery device; design; gas volatiles
合肥工业大学学报自科版