Experimental study of transportion characteristic of charged particle in a laboratory scale high velocity electrostatic precipitator

摘要

The efficiency of dust collection in an electrostatic precipitator is mainly determined by its electric operational parameters which depends on the design and arrangement of the corona and collecting electrodes. In this paper, experiments of fly ash purification are carried using the transverse plate ESP system (the laboratory scale transverse plate electrostatic precipitator self-designed). The influence factors of the ion concentration, such as the input energy density, the interval of dust collection plates, the gas velocity, have been studied experimentally. The results showed that the gas ion concentration and its transporting rate in the discharge space can be enhanced by increasing the gas velocity and its momentum in the electrostatic precipitator, because the high gas velocity can effectively prevent the gas ion neutralization in the discharge space. The study indicited that the gas ion concentration can be enhanced 1–2 magnitudes in the discharge space by increasing the gas velocity, therefore the collection efficiency can be effectively raised. Furthermore, the drift velocity of the dust and the volumetric flow of flue gas can be enhanced when the gas velocity increased. Therefore, the volume of transverse plate electrostatic precipitator can be reduced by 30∼40% compared with the conventional construction ESP and its miniaturization is realized.