Medium-Sulfur Coal and Fly Ash Resistivity |
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| Authors: | W A Harrison J K Nicholson J L DuBard J D Carlton L E Sparks |
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| Institution: | 1. Southern Company Services, Inc. , Birmingham , Alabama , USA;2. Southern Research Institute , Birmingham , Alabama , USA;3. U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA |
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| Abstract: | Electric generating plants burning medium-sulfur coal need a way to predict when ESP performance will be limited by high electrical resistivity of the collected fly ash. The main uncertainty in mathematical predictions of fly ash resistivity lies in the marginal effect of naturally occurring SO3 vapor in the flue gas. This paper results from a project to expand the data base of SO3/SO2 concentrations and fly ash resistivities measured in utility fly ash precipitators. Complete data sets are presented from three plants in the Southern Company electric system. In situ resistivity data are compared with laboratory measurements and with two different mathematical predictions of resistivity based on coal and ash analyses. The revised version of the resistivity predictor gives results in good agreement with resistivity values measured both in situ and in the laboratory. |
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