Electrostatic Precipitator (ESP)

An electrostatic precipitator (ESP), or electrostatic air cleaner is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. Electrostatic precipitators are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream.

Basic Operation:

The ESP charges the ash particles in the flue gas to collect and remove them. The unit is comprised of a series of (positively charged) parallel collector curtains tough which the gas passes. Centered betwen the collector curtains are (negatively charged) electrodes which produce the electrical field.


The discharge electrodes are connected to a High Voltage Source with a negative polarity. As the flue gas passes through the Electrical Field, the particulate (fly ash) takes on negative charge. During operation fly ash and other particulate build up on the collector plate surface. This is removed at a pre-determined time by Rapping System. The material removed falls into Hopper at the bottom of the precipitator. More than 98% particulate materials removed by ESP process on Tanjung Jati B 3&4 to meet the Indonesian environmental regulation (20% of opacity & 100 mg/Nm3 of particulate).

ESP schematic