Analysis and Simulation of Key Factors for Electrostatic Purification of Waste Hydraulic Oil Based on COMSOL
Abstract
Waste hydraulic oil, categorized as waste mineral oil, is listed in the National Hazardous Waste List of China, and improper disposal can cause serious pollution to soil and water environments. As a low-consumable purification technology, electrostatic oil purification enables efficient regeneration and resource-oriented treatment of waste hydraulic oil. Focusing on the electrostatic purification process, this study analyzes key influencing factors including electric field intensity, electrode structure, purification time, and flow rate based on theoretical models, and explains the migration process and action mechanism of pollutant particles under coupled electric-field and flow-field conditions. COMSOL Multiphysics is used for modeling and simulation to compare oil-purification device schemes with different electrode combinations. The results show that the wire-cylinder electrode combined with a roll-type dust collector satisfies the requirements of high-efficiency pollutant adsorption and reasonable electric-field gradient distribution. A purification device with a conical bottom enhances fluid velocity and energy transfer, facilitating rapid pollutant distribution and concentrated deposition. The findings provide technical references for electrostatic regeneration of waste hydraulic oil and treatment of similar pollutants.