A heating system is configured to produce heated fluid. The system includes a source of primary fluid, a diffusing structure comprising an outlet structure out of which the heated fluid flows, at least one conduit coupled to the source and the diffusing structure and configured to introduce to the diffusing structure the primary fluid, and an intake structure coupled to the diffusing structure and configured to introduce to the diffusing structure a secondary fluid accessible to the system. The heated fluid includes the primary and secondary fluids.

A method of extending the useful life of an aged selective catalytic reduction (SCR) catalyst bed, which catalyses the conversion of oxides of nitrogen (NO.sub.x) to dinitrogen (N.sub.2) in the presence of a nitrogenous reductant, in the exhaust gas after treatment system of a stationary source of NO.sub.x so that the exhaust gas emitted to atmosphere from the system continues to meet proscribed limits for both NO.sub.x and ammonia emissions, which method comprising the step of retrofitting an additional honeycomb substrate monolith or a plate-type substrate comprising a catalyst (ASC) for converting ammonia in exhaust gas also containing oxygen to nitrogen and water downstream of the aged SCR catalyst bed, wherein the kNO.sub.x of the honeycomb substrate monolith comprising the catalyst for converting ammonia in exhaust gas also containing oxygen to nitrogen and water is greater than or equal to 80 m/hr between 300 and 400 C. inclusive, wherein kNOx of a sample of the catalyst, which has been aged at 450 C. in 10% H.sub.2O (as steam) in air for 48 hours, is determined by a SCR activity test in a laboratory scale reactor using a gas composition of 50 ppm CO, 30 ppm NO, 36 ppm NH.sub.3, 15% O.sub.2, 8% water, 3% CO.sub.2, balance N.sub.2.

A mixing system for a power generation system. The power generation system includes a rotary machine, an exhaust processing system, and a duct system. The rotary machine is configured to produce an exhaust stream. The exhaust processing system is positioned to receive and process the exhaust stream. The duct system is oriented to channel an air stream to the exhaust processing system and to channel the exhaust stream from the rotary machine to the exhaust processing system. The mixing system is within the duct system. The mixing system includes a plurality of supports, a plurality of links extending between at least two of the supports, and at least one wrap circumscribing at least two of the links. The at least one wrap is oriented to change an effective direction of momentum of the exhaust stream and the air stream.

A combustion device burns fuel ammonia in a combustor using combustion air, and includes a catalyst reduction unit which is configured to reduce nitrogen oxides in a combustion exhaust gas supplied from the combustor, in which at least a part of the fuel ammonia is supplied to the catalyst reduction unit as a reducing agent for the nitrogen oxides in the combustion exhaust gas.

A gas turbine system includes an exhaust processing system that may process exhaust gas generated by a gas turbine engine, the exhaust processing system includes an exhaust diffuser that may receive the exhaust gas from a turbine of the gas turbine engine and having an annular passage disposed between an inner annular wall and an outer annular wall, and an air injection assembly disposed within the exhaust diffuser. The air injection assembly includes one or more air injection conduits disposed within the annular passage of the exhaust diffuser and including fluid injection holes that may direct a cooling fluid into a first mixing region of the exhaust diffuser.

There is disclosed a cooling system for a liquid cooled internal combustion aircraft power plant for an aircraft having a tail cone. The cooling system has: an air inlet defined through a wall of the tail cone and fluidly connected to an environment outside the aircraft; a heat exchanger having at least one first conduit fluidly connected to the environment via the air inlet and at least one second conduit in heat exchange relationship with the at least one first conduit and fluidly connectable to a coolant circuitry of the liquid cooled internal combustion aircraft power plant; a blower fluidly connected to the environment via the air inlet; and an air outlet fluidly connected to the blower and defined through a wall of the aircraft upstream of the air inlet relative to a direction of an airflow along the aircraft.

There is disclosed a cooling system for a liquid cooled internal combustion aircraft power plant for an aircraft having a tail cone. The cooling system has: an air inlet defined through a wall of the tail cone and fluidly connected to an environment outside the aircraft; a heat exchanger having at least one first conduit fluidly connected to the environment via the air inlet and at least one second conduit in heat exchange relationship with the at least one first conduit and fluidly connectable to a coolant circuitry of the liquid cooled internal combustion aircraft power plant; a blower fluidly connected to the environment via the air inlet; and an air outlet fluidly connected to the blower and defined through a wall of the aircraft upstream of the air inlet relative to a direction of an airflow along the aircraft.

An apparatus for treating exhaust gas of a thermal power plant according to the present invention includes: a diffusion module part controlling an exhaust gas flow between a duct disposed at a rear end of a gas turbine of the thermal power plant and the gas turbine to guide the exhaust gas flow toward an inner wall of the duct; a plurality of injection nozzles installed in a flow section in the duct in which the exhaust gas guided toward the inner wall of the duct from the diffusion module part flows, and protruding from the inner wall of the duct; a fluid supply pipe connected to the injection nozzles and extending outside the duct; a fluid supply part supplying a pollutant treatment fluid in liquid phase to the injection nozzles through the fluid supply pipe; and a catalyst module disposed at rear ends of the injection nozzles.

A gas turbine engine system is equipped with a tempering system for a selective catalyst reduction system. The subject tempering system for a selective catalyst reduction system comprises a tempering compartment equipped with a plurality of relatively high temperature environment self-supporting pipes, and optionally, a plurality of flow vanes.

An exhaust diffuser that is mounted at an outlet of a gas turbine to eject exhaust gas to the outside and includes hollow cylindrical internal diffuser guide and external diffuser guide. Further, the exhaust diffuser includes struts disposed between the internal diffuser guide and the external diffuser guide to space the internal diffuser guide and the external diffuser guide at a predetermined distance from each other, ejection areas formed on an outer side of the internal diffuser guide and having ejection holes for ejecting exhaust gas in a flow direction of exhaust gas, and suction areas formed on the outer side of the internal diffuser guide, disposed close to the ejection areas, and having suction holes for suctioning exhaust gas in the opposite direction to a flow direction of the ejected exhaust gas.