Effects of Gas Temperature and Materials Dielectric Constant on Collection Efficiency of the Tubular -Type Electrostatic Precipitator

Abstract

Gas temperature and dielectric constant of materials are the important parameters for collection efficiency of an electrostatic precipitator (ESP) due to its influences on particle charging efficiency inside the ESP. In this paper, effects of temperature and materials dielectric constant on the charging and collection efficiency of the tubular-type electrostatic precipitator (ESP) were analytically investigated. The current to voltage characteristic, mean charge per particle and collection efficiency were analyzed by mathematic model for the materials dielectric constant of 2.5-46.9, the operating temperature between 250 and 750 ^OC, the particle size range of 10 nm - 10 um, the applied corona voltage of 20 kV, the flow velocity of 3.4 m/s, and the humidity of 10%. It was found that higher dielectric constant of particle results in higher collection efficiency of the ESP. Also, an increase in the operating temperature results in increasing the ESP collection efficiency. It was shown that about 95% of overall collection efficiency can be achieved with a relative simple multiple tubular electrostatic precipitator design. The device appeared to be a promising tool for reducing particulate matter in flue gas from a small biomass combustion system.