Abstract
Abstract This investigation studied the effects of injecting dry hydrated lime into flue gas to reduce sulfur trioxide, (SO3) concentrations and consequently stack opacity at the University of Missouri-Columbia power plant. The opacity was due to sulf uric acid mist forming at the stack from high SO3 concentrations. As a result of light scattering by the mist, a visible plume leaves the stack. Therefore, reducing high concentrations of SO3 reduces the sulfuric acid mist and consequently the opacity. To reduce SO3 concentrations, dry hydrated lime is periodically injected into the flue gas upstream of a baghouse and downstream of an induced draft fan. The hydrated lime is transported downstream by the flue gas and deposited on the filter bags in the baghouse forming a filter cake. The reaction between the SO3 and the hydrated lime takes place on the filter bags. The hydrated lime injection system has resulted in at least 95% reduction in the SO3 concentration and has reduced the opacity to acceptable limit...
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