Reduction of Re-entrainment in an Electrostatic Precipitator by Installation of Shaped Elements

Abstract

It is proposed to install profiled C-shape elements on the receiving electrodes to reduce re-entrainment in an electrostatic tube-in-tube precipitator. Experiment planning is performed to evaluate the influence exerted by the configuration of the shaped elements on the efficiency of the precipitator. Its operating efficiency can be increased by 2-15%.An electrostatic precipitator is an apparatus that combines a cyclone and an electrostatic precipitator. There are a number of studies involving various designs of electrostatic precipitators. This investigation is devoted to the design of a tubein-tube electrostatic precipitator.Among the numerous parameters and phenomena affecting the operating efficiency of an electrostatic precipitator is the phenomenon whereby deposited particles are returned to the flow of cleaned gas. Re-entrainment of particles in electrostatic filters [1] may take place: I -during shake-down of the electrodes in dry electrostatic filters [2]; and, II -owing to rebound of coarse particles from the surface of the receiving electrode during their precipitation due to elastic impact of the coarse particles and low adhesion [3].When there are no coarse particles in the electrostatic filters, no re-entrainment is observed at velocities of up to 3 m/sec [4], carry-off is observed when particles with a diameter of more than 20 µm appear in the flow [5], and particles with a diameter of over and above 210 µm cause vigorous re-entrainment from the receiving electrodes [6]. Algorithms for calculation of re-entrainment of polydisperse ash, including use of fuzzy logic, are examined in [7,8].