Measurements of Sulfuric Acid at Tennessee Valley Authority Coal-Fired Power Plants Using the Condenser Method

摘要

The Tennessee Valley Authority (TVA) conducted three studies to characterize the H2SO4 in flue gases. The first study was designed to examine the effects of furnace type and two plant operation conditions--excess oxygen content and temperature of the flue gas--on the H2SO4 content of flue gas. Measurements were taken at four power plant units of different furnace types over ranges of excess oxygen content and at one plant over a range of flue gas temperatures. In the second study, the emission levels of H2SO4 and SO2 were characterized at one power plant by sampling flue gas at the base of the stack; and in the third study, the efficiency of the H2SO4 collection system was evaluated. The H2SO4 content of flue gas was found to increase with increasing oxygen content of the flue gas and to decrease with decreasing temperature of the flue gas. Sampling of emitted flue gases at one power plant showed that the emission rate for H2SO4 was about 0.3 percent of that for SO2. The efficiency of the method of sampling for H2SO4 was found to be satisfactory.