In order to suppress the escape of volatile organic compounds(VOCs)and reduce pollution during spraying operations,a spray recovery device with a double-layer recovery hood based on vacuum recovery technology is designed.Based on computational fluid dynamics(CFD),the VOCs recovery and spraying process are simulated in time domain,including gas-liquid interaction,droplet evaporation,and wall collision.The spatiotemporal distribution characteristics of VOCs and the sensitive parameters affecting escape are studied.The research has found that the inclination angle of the vacuum recovery tube and the vortex flow field inside the device have a significant impact on limiting the escape of VOCs.When the camber angle is 60°,VOCs gas escapes the least.Compared with when the camber angle is 0°,the time averaged VOCs mass fraction decreases from 0.8 to 0.21,indicating the best recovery effect.By adding baffles connecting the inner and outer chambers in the external chamber of the device,the generation of vortices can be effectively reduced,and the time averaged VOCs gas mass fraction can be controlled at 0.57,which can improve the recovery capacity.
关键词
高压无气喷涂/挥发性有机化合物(VOCs)/喷涂回收装置
Key words
high pressure airless spraying/volatile organic compounds(VOCs)/spraying recovery device
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