电极配置和操作条件对静电油烟净化效率的影响

The performance of oil fume removal by electrostatic precipitation and the effects of electrode matching, electric field wind velocity, ionization and collection voltages on the removal efficiency are systematically investigated in this study. Dioctyl sebacate (DOS) aerosol in the range of 0.02~2.02 μm produced by an aerosol generator is used to simulate the oil fume. The number and mass concentration of particles are measured by an Electrical Low-Pressure Impactor plus (ELPI+) particle detector. Results show that the charging amount and migration distance of oil fume are the key factors affecting purification efficiency. Optimizing electrode matching significantly increases the purification efficiency. The purification efficiency is better enhanced by increasing ionization voltage in the charging zone than increasing collecting voltage in the collection zone. It is difficult to remove particles of 0.13~0.23 μm in diameter in the oil fume and its graded purification efficiency greatly affects the overall purification efficiency. The decrease in wind velocity of the electric field or increase in the number of modules in series can increase the residence time of oil fume in the electric field and thus improve the purification efficiency. The benefit-cost ratio of applying the oil fume purification system can be enhanced by scientifically matching the electric field wind velocity and the number of modules according to the allowed construction space and the flue gas fluctuation.