Abstract
The effects of slag polarization on electrodes and several sidewall configurations on generator performance are investigated. An analysis of the experimental voltage/current characteristics between two generator frames is presented along with the examination of nonuniformities of interframe voltage. Experimental data reveal that the polarization effect reduces the overall electrical performance of a 60 deg diagonal conducting wall (DCW) channel by about 3%. Analytically, the effect of polarization on the local current and potential distributions is examined by solving the three-dimensional electrical potential using a finite-element method. A moderate increase of conductivity in the vicinity near the cathode side of the frame gives a calculated leakage resistance which approximates the value derived experimentally. The polarization effect results in a large change of the potential and current distributions near the frame but has a small effect on the overall electrical performance. Alternate sidewall/electrode configurations are considered analytically. First, the sidewall is completely insulated. While leakage is reduced, the performance of the generator is significantly lower due to an increase in the voltage drop. Second, a proportion of the sidewall is made conducting. That is, the electrode surface is extended onto the sidewall. This improves performance. Finally, segmented conducting sidewalls are considered withmore » the result showing performance as expected in a DCW generator with no polarization considered.« less
Published Version
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