||Development of a Charging/Collecting Device for High Resistivity Dust Using Cooled Electrodes.
Durham, M. D. ;
Rinard, G. A. ;
Rugg, D. E. ;
Sparks, L. E. ;
||Denver Research Inst., CO.;Industrial Environmental Research Lab., Research Triangle Park, NC.
Air pollution control equipment ;
Dust collectors ;
Electrostatic precipitators ;
Cooling systems ;
Design criteria ;
Performance evaluation ;
Electrical resistivity ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The paper discusses a charging/collecting device for high-resistivity fly ash, developed to control back-ionization by cooling the collector electrode internally with water. The device consists of parallel 6.0 cm pipes with corona wires suspended between them. The pipes provide a simple means of interfacing with a cooling water system and also minimizing the collector area needing to be cooled. Cooling the pipes with 38C (100 F) water eliminated back-ionization and permitted average field strengths of 7 kV/cm with fly ash having a resistivity > 10 to the 12th power ohm-cm. Test results on an actual flue gas stream and plans for future testing are described. Initial tests using heated instead of cooled electrodes are described, as well as other tests that led to the present design. Test results with the heated electrode show the kind of improvement in performance that can be obtained when resistivity is controlled in only a small collection area. (Copyright (c) 1982 - Air Pollution Control Association.)