Abstract: A system for controlling a reagent flow to a furnace in a SCNR process includes at least one injection distribution module (IDM) for supplying water to a plurality of injection lances, metering valves for supplying a NOx reducing agent to the plurality of injection lances, wherein the reagent injection rate of each injection lance is controlled by one metering valve such that a reagent concentration in each injection lance is adjustable and variable from one another. A method for controlling a reagent flow to a furnace includes providing at least one IDM, and for each IDM, providing a plurality of injection lances in communication with the IDM, supplying water to the plurality of injection lances through the IDM and supplying a NOx reducing agent through metering valves, wherein each metering valve controls the reagent injection rate to one injection lance.

Abstract: A system for controlling a reagent flow to a furnace in a SCNR process includes at least one injection distribution module (IDM) for supplying water to a plurality of injection lances, metering valves for supplying a NOx reducing agent to the plurality of injection lances, wherein the reagent injection rate of each injection lance is controlled by one metering valve such that a reagent concentration in each injection lance is adjustable and variable from one another. A method for controlling a reagent flow to a furnace includes providing at least one IDM, and for each IDM, providing a plurality of injection lances in communication with the IDM, supplying water to the plurality of injection lances through the IDM and supplying a NOx reducing agent through metering valves, wherein each metering valve controls the reagent injection rate to one injection lance.

Abstract: A lean burn combustion source includes a first side stream comprising an inlet and an outlet, both positioned downstream of a furnace and upstream of a particulate control device, and a second side stream comprising: an inlet positioned downstream of the particulate control device and upstream of the catalyst, a heat exchanger section passing through the first side stream, whereby heat from hot exhaust gas flowing through the first side stream is transferred to hot exhaust gas flowing through the second side stream, an injector positioned in the second side stream injecting aqueous based reagent into the hot exhaust gas flowing through the second side stream such that the aqueous based reagent decomposes to ammonia gas, and an outlet in fluid communication with a reagent distribution device positioned in the primary exhaust gas stream downstream of the particulate control device and upstream of the catalyst.

Abstract: A method for reducing NOx emissions in the exhaust of a combined cycle gas turbine equipped with a heat recovery boiler and a catalyst effective for NOx reduction, wherein a slip stream of hot flowing exhaust gases is withdrawn from the primary gas flow after the catalyst at a temperature of 500° F. to 900° F. and directed through a fan to a continuous duct into which an aqueous based reagent is injected for decomposition to ammonia gas and the outlet of the continuous duct is connected to an injection grid positioned in the primary exhaust for injection of ammonia gas into the primary exhaust stream at a location upstream of the catalyst.

Abstract: A system for controlling a reagent flow to a furnace in a SCNR process includes at least one injection distribution module (IDM) for supplying water to a plurality of injection lances, metering valves for supplying a NOx reducing agent to the plurality of injection lances, wherein the reagent injection rate of each injection lance is controlled by one metering valve such that a reagent concentration in each injection lance is adjustable and variable from one another. A method for controlling a reagent flow to a furnace includes providing at least one IDM, and for each IDM, providing a plurality of injection lances in communication with the IDM, supplying water to the plurality of injection lances through the IDM and supplying a NOx reducing agent through metering valves, wherein each metering valve controls the reagent injection rate to one injection lance.

Abstract: A system for controlling reagent flow to an exhaust of a lean burn combustion source includes a plurality of decomposition ducts each being connected to at least one injection lance of a reagent injection grid and supplying reagent and hot carrier gas to the injection lance, and at least one metering valve in communication with each of the plurality of decomposition ducts that controls reagent injection rate to the injection lance. A method of controlling a reagent flow to an exhaust of a lean burn combustion source includes providing a reagent injection grid having at least one injection lance, supplying the reagent and hot carrier gas to the reagent injection grid from a plurality of decomposition ducts coupled to the injection grid, and controlling reagent injection rate to the injection grid via at least one metering valve in communication with each of the plurality of decomposition ducts.

Abstract: A lean burn combustion source includes a first side stream comprising an inlet and an outlet, both positioned downstream of a furnace and upstream of a particulate control device, and a second side stream comprising: an inlet positioned downstream of the particulate control device and upstream of the catalyst, a heat exchanger section passing through the first side stream, whereby heat from hot exhaust gas flowing through the first side stream is transferred to hot exhaust gas flowing through the second side stream, an injector positioned in the second side stream injecting aqueous based reagent into the hot exhaust gas flowing through the second side stream such that the aqueous based reagent decomposes to ammonia gas, and an outlet in fluid communication with a reagent distribution device positioned in the primary exhaust gas stream downstream of the particulate control device and upstream of the catalyst.

Abstract: A method for reducing NOx emissions in the exhaust of a combined cycle gas turbine equipped with a heat recovery boiler and a catalyst effective for NOx reduction, wherein a slip stream of hot flowing exhaust gases is withdrawn from the primary gas flow after the catalyst at a temperature of 500° F. to 900° F. and directed through a fan to a continuous duct into which an aqueous based reagent is injected for decomposition to ammonia gas and the outlet of the continuous duct is connected to an injection grid positioned in the primary exhaust for injection of ammonia gas into the primary exhaust stream at a location upstream of the catalyst.

Abstract: A system and method for reducing NOx emissions from a lean burn combustion source is provided. The system includes a blower passing air through a continuous duct having a hot portion and a reaction portion. The hot portion of the duct is positioned in the convective zone of the combustion source to heat the passing air for the reaction portion of the duct. An injector attached to a urea storage container is positioned in the reaction portion of the duct and sprays urea from the storage container into the heated air in the reaction duct for evaporation and decomposition into ammonia gas. The ammonia gas is then supplied to an injection grid in the exhaust duct of the lean burn combustion source upstream of a NOx reduction catalyst. The injection grid supplies the ammonia gas to the exhaust gas in the exhaust duct.

Abstract: A system and method for reducing NOx emissions from a lean burn combustion source is provided. The system includes a blower passing air through a continuous duct having a hot portion and a reaction portion. The hot portion of the duct is positioned in the convective zone of the combustion source to heat the passing air for the reaction portion of the duct. An injector attached to a urea storage container is positioned in the reaction portion of the duct and sprays urea from the storage container into the heated air in the reaction duct for evaporation and decomposition into ammonia gas. The ammonia gas is then supplied to an injection grid in the exhaust duct of the lean burn combustion source upstream of a NOx reduction catalyst. The injection grid supplies the ammonia gas to the exhaust gas in the exhaust duct.

Abstract: Methods and apparatus for injecting reagent, such as an aqueous urea solution, into an exhaust stream in order to reduce emissions from an engine exhaust. The present teachings can use a whirl plate having a plurality of whirl slots surrounding an exit orifice of an injector, which produce a high velocity rotating flow in the whirl chamber. When the rotating flow of reagent is passed through the exit orifice into an exhaust stream, atomization occurs from a combination of centrifugal force and shearing of the reagent by air as it jets into the exhaust stream.

Abstract: A method of reducing emissions from a diesel engine including the steps of providing an injector to an exhaust outlet of the diesel engine, the injector having an orifice with a diameter of about 0.006 inch or less, providing a reagent to the injector at an inlet pressure between about 120 psi and about 60 psi, actuating the injector on and off at a frequency between about 10 Hz and about 1 Hz with an on-time of about 1% or more, injecting the reagent via the orifice into the exhaust outlet at an injection rate, and wherein varying of at least two of the inlet pressure, the frequency, and the on-time achieves a turn-down ratio of a maximum injection rate to a minimum injection rate of at least about 31:1.

Abstract: Methods and apparatus for injecting reagent, such as an aqueous urea solution, into an exhaust stream in order to reduce emissions from an engine exhaust. The present teachings can use a whirl plate having a plurality of whirl slots surrounding an exit orifice of an injector, which produce a high velocity rotating flow in the whirl chamber. When the rotating flow of reagent is passed through the exit orifice into an exhaust stream, atomization occurs from a combination of centrifugal force and shearing of the reagent by air as it jets into the exhaust stream.

Abstract: The present invention provides methods and apparatus for injecting reagent, such as an aqueous urea solution, into an exhaust stream in order to reduce oxides of nitrogen (NOx) emissions from diesel engine exhaust The present invention uses mechanical spill return atomization techniques to produce droplets approximately 50 ?m SMD (Sauter mean diameter) or smaller. This size range is appropriate to allow urea to react into ammonia within the residence time associated with an on-road diesel engine. This effect is achieved through the use of a whirl plate having a plurality of whirl slots surrounding an exit orifice of the injector, which produce a high velocity rotating flow in the whirl chamber. When the rotating flow of reagent is passed through the exit orifice into an exhaust stream, atomization occurs from a combination of centrifugal force and shearing of the reagent by air as it jets into the exhaust stream.

Abstract: A burner flame stabilizer which circumferentially stages the air to form circumferentially-spaced fuel rich and fuel lean zones for lowering of NO.sub.x is described. A circumferential solid fuel stager is described, which operates with a fuel stabilizer to provide increased dwell time for coal particles volatilization in a recirculation zone established by the flame stabilizer. Various embodiments are described.