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.

中文翻译：

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切割车间工作区域的油雾颗粒分布和空气质量改善


切割过程中循环排放的油雾颗粒对机械厂的工人健康构成严重危害。受排放参数和季节性因素的影响，油雾颗粒在工人呼吸区的动态分布尚不明确，有待提出合适的通风优化方案。本文通过数值仿真研究了油雾颗粒在工人呼吸区的动态分布和通风优化。研究发现，受切割过程排放参数的影响，呼吸区油雾颗粒浓度的累积值、峰值和峰值持续时间分别比其他条件高 1.5 ∼ 5 x、3 ∼ 7 x 和 2 ∼ 3 x。由于空调气流的干扰，冬季浓度较高，周期性波动明显（7 x），而夏季浓度相对较低且稳定（2 x）。平行流风幕可以将呼吸区中的油雾颗粒浓度降低 42.1 % ∼ 67.9 %，能耗增加 13 % ∼ 50 %。本文为明确工业建筑中工人岗位污染物的动态分布以及工人呼吸环境的保护提供了指导。