Development of a 24-Hour Method for Analysis of SO2 and CO2 from Electric Utility Units Equipped with Flue Gas Desulfurization Scrubbers |
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| Authors: | Frank E Butler Joseph E Knoll M Rodney Midgett |
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| Institution: | Environmental Monitoring Systems Laboratory, U.S. Environmental Protection Agency , Research Triangle Park , North Carolina , USA |
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| Abstract: | A procedure was developed for the 24-h determination of SO2 and CO2 in effluent gas from fossil fuel combustion sources. Laboratory experiments were conducted to test absorption of SO2 in hydrogen peroxide solution and absorption of CO2 by sodium hydroxide on an inert substrate at expected ambient temperatures of 15 to 45°C. Isopropyl alcohol cannot be used to trap sulfuric acid and particulates because it permeates the sampling train and prevents complete absorption of CO2. Elemental analysis of stack particulates revealed that at least 31 elements were present. Iron and other elements interfered with SO2 analysis. These particulates were completely removed by a heated borosilicate glass filter. Both laboratory and field experiments showed that molecular sieves are a promising alternative for CO2 absorption. Statistical evaluation of data collected at three units equipped with flue gas desulfurization scrubbers proved that the new procedure is accurate and precise. |
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