Electrostatic Precipitator

    Flue gas forced to pass two electrodes (electrical terminals), which take the form of metal wires, bars, Bag, or plates inside a pipe or smokestack. The first electrode is charged to a very high negative voltage. As the dirt particles move past it, they pick up a negative charge. Higher up the pipe (or further along, if it’s a horizontal pipe), there’s a second electrode consisting of metal plates charged to a high positive voltage (50,000–00,000 volts is typical). Since unlike charges attract the negatively charged soot particles are attracted to the positively charged plates and stick there. From time to time, the collecting plates have to be shaken to empty away from the ash by rapping.