Apparatus for the treatment of gas turbine exhaust gas

Apparatus for treatment of combustion gas containing nitrogen oxides exhausted from a gas turbine that extracts work from high pressure combustion gases obtained from a combustion chamber burning fuel and compressed air, the apparatus for treatment being mounted within an exhaust duct leading from the turbine to the environment and including means for silencing sound, wherein the improvement comprises a source of reagent that will reduce nitrogen oxides;

• a source of water;
• means mixing the water with the reagent to provide a reagent liquid;
• valve means for controlling only the flow of reagent to said means mixing;
• valve means for separately controlling the flow of water to said means mixing;
• said means for silencing sound including a plurality of gas permeable containers extending across the exhaust duct transversely with respect to the flow of the combustion gases through the exhaust duct;
• catalyst, within each of said containers, that increases the reduction reaction between the reagent and the nitrogen oxides contained within the combustion gas;
• a plurality of atomizer means for atomizing the reagent liquid with air while injecting the reagent liquid upstream of said containers and towards said containers in the direction of combustion gas flow through said exhaust duct, so that the water will cool the combustion gases to a temperature more suitable for reaction with the reagent;
• said atomizer means including a plurality of liquid nozzles and an immediately adjacent plurality of air nozzles;
• said injector means further including a source of pressurized air, air conduit means for conducting pressurized air from said pressurized air source commonly to all of said air nozzles, liquid conduit means conducting the reagent liquid from said mixing means commonly to all of said liquid nozzles, a liquid pump within said liquid conduit means for pressurizing the reagent liquid, valve means within said air conduit means for controlling the flow of pressurized air to said air nozzles, and valve means within said liquid conduit means for controlling the flow of pressurized reagent liquid to said liquid nozzles.