A. Marchewicz

Dust particles precipitation in AC/DC electrostatic precipitator

Submicron and nanoparticles removal from flue or exhaust gases remain still a challenge for engineers. The most effective device used for gas cleaning in power plants or industry is electrostatic precipitator, but its collection efficiency steeply decreases for particles smaller than 1 micron. In this paper, fractional collection efficiency of two-stage electrostatic precipitator comprising of alternating electric field charger and DC supplied parallel-plate collection stage has been investigated. The total number collection efficiency for PM2.5 particles was higher than 95% and mass collection efficiency >99%. Fractional collection efficiency for particles between 300 nm and 1 μm was >95%.

SUBMICRON PARTICLES EMISSION CONTROL BY ELECTROSTATIC AGGLOMERATION

An alternating electric field charger/agglomerator, in which particle charging and their coagulation occurs in one stage, is presented in this paper. Th e charger/agglomerator is based on an alternating e lectric field charger formed by a set of two discharge electrodes separated by a set of two parallel grids by each s ide of the discharge electrodes. The particles are charged by ionic current in alternating electric field that al lows the charge imparted to the particles to be higher than for DC chargers. Due to oscillatory motion of the particle s between the electrodes, particles of different mobilities c an collide and coagulate. Number fractional collect ion efficiency of PM2.5 particles in semi-industrial scale, two-st age charger/agglomerator with precipitator section was higher than 90%.