Distribution of oil mist particles and air quality improvement in the working area of the cutting workshop.

The oil mist particles cyclically emitted during the cutting process are a serious health hazard for workers in machine plants. Affected by emission parameters and seasonal factors, the dynamic distribution of oil mist particles in the workers' breathing zone is not yet clear, and suitable ventilation optimization is yet to be proposed. This paper investigates the dynamic distribution of oil mist particles in the workers' breathing zone and ventilation optimization by numerical simulation. It was found that the accumulated value, peak value, and duration of peak of the oil mist particle concentration in the breathing zone are 1.5 ∼ 5 x, 3 ∼ 7 x, and 2 ∼ 3 x higher than other conditions, respectively, influenced by the emission parameters of the cutting process. Due to the interference of air conditioning airflow, the concentration is high in winter with obvious periodic fluctuations (7 x), while it is relatively low and stable (2 x) in summer. Parallel flow air curtains can decrease the concentration of oil mist particles in the breathing zone by 42.1 % ∼ 67.9 %, with a 13 % ∼ 50 % increase in energy consumption. This paper provides guidance for clarifying the dynamic distribution of pollutants at workers' post in industrial buildings, as well as the protection of workers' breathing environment.