Abstract: A system, in one embodiment, includes an air injection system comprising a plurality of air injection tubes having a staggered arrangement, wherein each of the plurality of air injection tubes is configured to inject air into an exhaust duct.

Abstract: Systems for reducing nitrogen oxides in combustion exhaust gas include a selective catalytic reactor (SCR) assembly having a catalyst bed for receiving a flow of exhaust gas, an exhaust gas conduit for introducing exhaust gas to the SCR assembly, at least one nozzle for introducing cooling water into the exhaust gas before the exhaust gas exits the SCR assembly, and at least one reductant conduit for introducing at least one reductant into the exhaust gas to form a reductant/exhaust mixture before the exhaust gas exits the SCR assembly. Methods for reducing nitrogen oxides in combustion exhaust gas include introducing an exhaust gas into a SCR assembly, and introducing cooling water into the exhaust gas, reducing the temperature of the exhaust gas, and introducing at least one reductant into the exhaust gas to form a reductant/exhaust mixture before the exhaust gas exits the SCR assembly.

Abstract: A system, in one embodiment, includes an air injection system comprising a plurality of air injection tubes having a staggered arrangement, wherein each of the plurality of air injection tubes is configured to inject air into an exhaust duct.

Abstract: An electrical generation system including a first gas turbine and a a heat recovery steam generator coupled to the gas turbine and including a low pressure super-heater having a low pressure super-heater output. The electrical generation system also includes a second gas turbine, an output duct coupled to the second gas turbine and a supplemental low pressure super-heater within the output duct and thermally coupled to the low pressure super-heater output.

Abstract: An ammonia injection system including an aqueous ammonia store adapted to store aqueous ammonia. The system also includes an ammonia pump having in input coupled to the aqueous ammonia store and a pump output. The system also includes and an ammonia vaporizer coupled to the pump output and having a vaporizer input configured for connection an output of low pressure super-heater, the vaporizer including a grid output adapted for connection to an ammonia injection grid.

Abstract: Systems and methods for augmenting the power generation capabilities of combined cycle power generation systems by more effectively recovering heat from exhaust gases of peaking cycle gas turbines are provided in the disclosed embodiments. In certain embodiments, the present techniques may include receiving superheated steam from a heat recovery steam generation (HRSG) unit. Heated exhaust gas from a peaking cycle gas turbine may be used to transfer heat to the superheated steam received from the HRSG. The systems used to transfer heat to the superheated steam may include a supplementary superheater located in an exhaust path of the peaking cycle gas turbine. The superheated steam exiting the supplementary superheater may be delivered to a steam turbine of a combined cycle power generation system, where the superheated steam may be used as a power source.

Abstract: Embodiments of the present disclosure relates to a system for reducing nitrogen oxides in a combustion exhaust gas comprising a selective catalytic reactor assembly comprising a catalyst bed for receiving a flow of the combustion exhaust gas, an exhaust gas conduit for introducing the combustion exhaust gas to the selective catalytic reactor assembly, at least one nozzle for introducing cooling water into the combustion exhaust gas before the combustion exhaust gas exits the selective catalytic reactor assembly, and at least one reductant conduit for introducing at least one reductant into the combustion exhaust gas to form a reductant/exhaust mixture before the combustion exhaust gas exits the selective catalytic reactor assembly.