Dust Resistivity Measurement and Onset of Back Corona in Electrostatic Precipitators
M. Majid, H. Wiggers, and P. Walzel
Faculty of Bio and Chemical Engineering, Technical University of Dortmund, Germany
Abstract
Electrical resistivity of the dust, to be separated in an electrostatic precipitator, is an important parameter from the design and operation point of view. Mostly it is measured in the laboratories using a measurement apparatus and the dust sample collected from the hopper beneath the precipitator. A laboratory setup will be introduced to measure the dust resistivity using a new method. Here, the onset of back corona can be detected directly during the experiment which can be eliminated immediately from the system by reducing the current by controlling the supplied voltage. Experiments were performed with a fly ash sample with 11 μm and four glass samples with 75, 112, 278 and 394 μm mean particle sizes. Results will be presented and discussed about the influence on resistivity results of dust resistivity measurement method: point-plate and plate-plate, mode of temperature variation: ascending and descending, air temperature, particle size and air humidity. Finally, the visualization of back corona in such systems will be presented.
Keywords - Dust resistivity, back discharge, back corona, electrostatic precipitator
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