Experiment Study In Particles Charge And Agglomeration At AC Electric Field

At present, the theoretics of electrostatic precipitation is imperfect. There are some problems about the existing electrostatic precipitator, such as large volume, high cost and low efficiency of micro-size soot collecting. To improve the technical performance of electrostatic precipitator, achieve the miniaturization of pre-charge equipment, pre-charge equipment is installed in the soot channel of electrostatic precipitator, charge and conglomeration experiments in AC electric-field are conducted. The results of the experiments are as follow:(1)Ionic concentration can be enhanced through increasing rate of gas flow. So adding a pre-charge facility in soot channel can increase ionic concentration to be about 1 order of magnitude greater than it is in the field of electrostatic precipitation. (2)The process of particle agglomeration is strengthened by a high voltage AC electric field after the pre-charge facility. Results show that the facility can has good effect on soot charge and agglomeration; best effect can be obtained when the frequency of AC electric field is 40Hz.(3)The pre-charge facility is propitious to improve the technology performance of electrostatic precipitator. After the pre-charge facility is installed, the particle diameter and the efficiency of electrostatic precipitator have been increased 21%, 2.6-3.5%, respectively.The results show that both particle diameter and efficiency of electrostatic precipitator can be enhanced by installing pre-charge facility in soot channel. At the same time, it is also beneficial to realize the miniaturization of electrostatic precipitator, for the volume of pre-charge facility in soot channel is small than that of normal one, it needn't additional extra increase the volume of the electrostatic precipitator.