Abstract: Objective To understand the situation of excessive concentrations of harmful substances such as hydrochloric acid mist during the electroplating process in the workshop,provide reference guidelines for the rational design of a side suction exhaust system for the electroplating workshop. Methods In July 2023,the plating workshop of a machine shop in Xi'an City was selected as the research object. The occupational hygiene on-site investigation,on-site testing,theoretical analysis and calculation,simulation and numerical analysis and other methods were used to calculate the air volume demand of the exhaust system,propose a comprehensive management scheme for scattered acid mist,and verify the improvement effect. Results Following on-site inspection and testing,it was found that the measured total air volume of the current ventilation system is 11 057.04 m³/h,which does not meet the actual exhaust volume requirements. The required air volume for the side exhaust system in the electroplating workshop was recalculated,and the design proposal was improved. The numerical simulations demonstrated that the calculated air volume meets the exhaust requirements of the system. The original air velocity at the exhaust hood openings in the electroplating workshop ranged from 3.4 m/s to 0.292 m/s,with an unevenness index of 0.65. After plan optimization,the maximum air velocity at the exhaust hood openings reached 12.984 m/s,with a minimum of 12.032 m/s,and an air velocity unevenness index of 0.03,indicating significant improvement in performance. Conclusions The excessive concentration of hydrochloric acid mist in the plating workshop is caused by insufficient air volume of the exhaust system,inadequate wind pressure,serious corrosion of exhaust facilities and pipes,and unreasonable design of exhaust hoods. After improvement and verification,the comprehensive management scheme has a good control effect on hydrochloric acid mist.

Key words: Plating workshop, Side suction exhaust, Uniform flow design, Numerical simulation, Engineering management, Ventilation protection technology