Finding of No Significant Impact: Tennessee Valley Authority Selective Noncatalytic Reduction Project, Johnsonville Fossil Plant, Units 1-4

摘要

Nitrogen oxide, or NOx, is a compound of nitrogen and oxygen that is a byproduct of coal combustion. NOx is an air pollutant that contributes to the formation of acid rain and ground-level ozone. As part of its systemwide goal of reducing NOx emissions by over 78 percent, the Tennessee Valley Authority (TVA) is proposing to install selective noncatalytic reduction systems (SNCRs) on Units 2, 3, and 4, or any combination of these units, at the Johnsonville Fossil Plant (JOF). An SNCR system was installed previously on JOF Unit 1, and the SNCR systems for one or more of the other three units would be operational by 2009. The SNCR process involves the precise injection of a urea-water solution into the flue gas as it exits the boiler. In a series of chemical reactions, the urea reacts with NOx to form elemental nitrogen, carbon dioxide, and water vapor. TVA has prepared an Environmental Assessment (EA) that is incorporated by reference.