Intense field dielectric purification of oil droplets in machining buildings

Abstract

Intense field dielectric (IFD) exhibits environmental friendliness and high efficiency in particle purification, with varying efficiencies based on the physical properties of the particles. However, limited research has been conducted on the application of IFD for purifying indoor air polluted by oil droplets. This study experimentally investigated the efficacy of IFD in purifying machining-generated oil droplets. The primary objectives were to clarify the advantages, applicability, and recommended parameters for the purification of oil droplets using IFDs. The results indicate that the efficiency and pressure drop of using IFD for oil droplet purification can reach three times and half, respectively, compared to the conventional low-resistance filter (G4 filter). Furthermore, a formula was derived through fitting to describe the efficiency and pressure drop of IFD for oil droplet purification. IFD achieved a purification efficiency of over 90 % with a deviation of less than 8 % for oil droplet diameters greater than 5.0 μm or airflow velocities below 0.5 m/s. IFD exhibited over 4 % and 2 % higher purification efficiency for atomized and soluble oil droplets, respectively, in comparison to evaporated-condensed and straight oil droplets. At airflow velocities below 1.0 m/s, IFD demonstrated purification efficiencies exceeding 80 % for oil droplets generated by evaporation-condensation and over 90 % for those generated by atomization. Increasing the atomized oil flow rate from 20 to 60 ml/h resulted in corresponding 15 % improvement in purification efficiency, attributed to the larger droplet diameters. This study laid the groundwork for effective utilization of IFDs in the context of machining-generated oil droplet purification.