Historically, fine particulate (sub-micron-sized materials) has been very difficult and expensive to control and collect using conventional emission control equipment such as electrostatic precipitators (ESP's) and fabric filters (FF's). FPA technology applies the basic principles of ESP science and uses it to promote particulate growth via agglomeration within an ESP rather than attempting to collect it in a conventional manner. This approach makes it possible to change fine particulate into larger, more easily collected and controlled size. This is achieved by using the principles of laminar flow.
It has long been known that collection efficiencies of 100% could be achieved in ESP's when they are operated in the laminar flow regime. To realize the benefits of this effect, a region of streamline flow conditions and electric field characteristics is created within the confines of a conventional ESP. Ideally, this is done in the second field of an ESP, which is equipped with at least three and preferably four fields.
These conditions promote the interaction of fine particles among themselves and with larger particles. This interaction results in the formation of larger particles. These larger particles, which are easier to collect than fine particulate, can then be collected in the downstream fields of the unit. The schematic diagram depicts the process.
Environmental Elements Corporation, 3700 Koppers Street, Baltimore, MD, 21227. Phone: 410-368-7361; Fax: 410-368-6721.