Estudo do perfil de concentração em um preciptador eletrostático do tipo placa-fio.

Abstract

The different models utilized for the calculation of the collection efficiency of electrostatic precipitators are based in distinct hypotheses about the behavior of the particles inside the equipment. Hence, in one extreme they consider the particles in perfect mixture, in a flat concentration profile in turbulent flow, known as the Deutsch model, and in the other it is assumed a laminar flow without mix. Other authors proposed intermediate theoretical behaviors. However, experimental results are very scarce. Therefore, to know the real behavior inside the precipitator, an experimental method was devised to measure and determine the concentrations of the aerosol and verify which of the proposed behaviors in the literature describe adequately the data. The electrostatic precipitator utilized was of the plate-wire type, in laboratorial scale, with a 0.50 m in length and 0.20 m in width, with 6 discharge electrodes. It was observed that the points of higher concentrations occurred in the duct center and decreased towards the walls. The Deutsch model offered the best description of the experimental profile. However, it was noticed that in the entrance region, a different behavior occurred. Also, it was noticed that, with the increase of the electric field, the concentration decreased both in the center as near the wall, and this variable presented a more significant effect in the concentration than the gas velocity.