AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Charging and Collection Performance of a Novel ESP with an Indirect Particle Charging Method against Submicron Particles
HAK-JOON KIM, Bangwoo Han, Chang-gyu Woo, Yong-Jin Kim, Seong-Jin Park, Jong-Pil Yoon, Korea Institute of Machinery and Materials
Abstract Number: 635 Working Group: Control Technology
Abstract A novel two-stage ESP for IT manufacturing industries was developed that uses a mixing type carbon brush charger which is located outside of a main gas flow duct to achieve perfect separation from contact of polluted gases, and imposes additional electric field between upper and bottom plates of the charging stage to enhance collisions between ions and particles thus increase particle charges. The performance of the ESP was evaluated experimentally for ultrafine particles with a mean diameter of 100 nm based on number, and of 200 nm based on surface area by varying the voltages for chargers and for additional electric field imposing, and number of the chargers. Finally, the collection efficiencies of the ESP were compared with those obtained from the Deutch’s collection theory using experimental particle average charges. The total air flow rate for the test were approximate 110 L/min with 10:1 ratio of main and mixing flows in the ESP, and applied voltages for chargers and additional electric field were from -10 to -22 kV, and from -5 to -10 kV, respectively. Collection efficiencies in the ESP were linearly proportional to increase in number of chargers and applied voltage to chargers, while those were inversely proportional to increase in applied voltage for additional electric field. The collection efficiency of the ESP for 110 L/min corresponding to flow speeds of approximate 0.19 m/s through the charging stage and 0.23 m/s through the collection cell was reached to over 90% based on total particle number at the applied voltage to triple chargers of -15 kV and additional electric field between upper and bottom plates in charging stage of -6 kV/ 100 mm.