This type of precipitator is used in removal of tar from flue gases of carbon baking furnaces, producer gas plants, etc.

Functional description of Electrostatic Tar Precipitator :

In the following graphic you will see the function of electrostatic tar precipitator :

Tar laden gas is introduced into the Precipitator through the bottom.
Gas gets evenly distributed across the entire cross-section by passing through layers of
        specially designed perforated screens.
Tar separated from gas by collecting on evenly spaced cylindrical sheets and removed from
        bottom end of casing.