An Electrostatic Precipitator (ESP) is a filtration device that removes fine particles, like dust and smoke, from a flowing gas using the force of an induced electrostatic charge minimally impeding the flow of gases through the unit.
The electrostatic precipitation process consists of three steps : particle charging, particle collection and removal of the collected dust.
Particle charging is accomplished by means of a corona which produces ions that become attached to the particles.
The charge on the particles in the presence of an electric field resulsts in a new force in the direction of the collection electrode. This force cause particles to be deposited on the collection electrode.
Once collected, particles can be removed by impact or rapping.
The two primary types of electrostatic precipitator :