Removal of Fine Particulate Matter (PM) from Boiler Exhaust Gas in Electrostatic Water Spraying Scrubber

Abstract

Boiler exhaust gas consists of many components that cause air pollution, such as: particulate matter (PM), SOx, NOx, COx, etc. These pollutants normally are mixed. To eliminate them, a scrubber is currently used, depending on a coal fuel used for combustion source in the boiler. For PM, new guidelines will be changed from the existing PM10 to PM2.5 within the next few years; The scrubber is widely used for the collection of PM from industrial exhausts because of its low equipment and maintenance costs combined with operational safety and high collection efficiency. The electrostatic water spraying scrubber, studied in this paper, is one of such types of devices, which combines advantages of electrostatic precipitators and inertial wet scrubbers, and removes many shortcomings inherent to both of these systems operating independently. Unlike wet electrostatic precipitators in which PMs are precipitated only on the collection electrode, in electrostatic water spraying scrubber, the collection of PMs takes place in the entire the scrubber. Compared to inertial scrubbers, the electrostatic water spraying scrubbers can operate at lower droplet velocities, but total collection efficiency is over 93% of all PM sizes