Bipolar Structure of a Back-Discharge Field in an Electrostatic Precipitator |
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Authors: | Masuda Senichi Nonogaki Yutaka |
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Affiliation: | Department of Electrical Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan 113.; |
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Abstract: | The current densities of positive and negative ions i+ and i- in the back-discharge field of an electrostatic precipitator (ESP) are measured with a bipolar current probe. The ratio i+/i- rises with increasing total current density i (= i+ + i-) in the streamer-mode back discharge, but it remains almost constant (10-20 percent) in the glow-mode back discharge. The probe-measured values of the back-discharge-starting current density are slightly higher in pulse charging than in dc charging. In addition, the pulse charging does not cause back discharge at a resistivity below 1013 ?cm. However, beyond 1014 ?cm the back discharge can hardly be avoided, even by pulse charging. The probe diagnosis of i+/i- in an ESP enables an approximate estimation of the charge-to-mass ratio of dust and the collection performance when i+/i-, averaged in space, is used. |
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