197results about "Fluegas recirculation" patented technology

A recuperator burner (100) comprises a burner base (10) and a combustion chamber tube (30) with a burner nozzle (41), as well as an exhaust gas recirculation device with a combustion air-driven jet pump. The jet pump includes a jet nozzle with a cross-section that decreases in the flow direction and has an annular jet pump gap (26) for drawing in exhaust gases by means of an annular jet. The exhaust gas recirculation device is located upstream of the mixing plane of the combustion gases flowing into the combustion chamber tube (30; 230), between the burner base (10) and the combustion chamber tube (30; 230). It comprises at least one continuous exhaust gas intake opening (34; 234) and / or a circumferential, self-contained arrangement of several exhaust gas intake openings that lead into the interior of the combustion chamber tube (30). Upstream of the combustion chamber tube (30), a recuperator (20) with a heat transfer body (21) is arranged, which has flow channels (29.1, 29.2) designed to guide counter-flowing fluids. The fluids enter and exit the flow channels (29.1, 29.2) in the heat transfer body (21) via inlet and outlet openings (23, 24). One fluid consists of combustion air to be preheated, and the other of exhaust gas.

The present invention relates to the field of flue gas nitrogen oxide emission, and in particular to a method and a combustion system for reducing nitrogen oxide emission. Introducing non-nitrogen inert gas as a combustion diluent to establish ignition; when the amount of circulation flue gas reaches a designed value, the introduction of the non-nitrogen inert gaseous diluent is stopped; and by means of circulation of a part of flue gas and a part of CO2 in the flue gas, the internal circulation of the whole process system is ensured. The present invention achieves the objectives of reducing the nitrogen oxide emission and saving the fuel, thereby saving the energy, protecting the environment, fundamentally solving the emission problem of NOx in the flue gas, and achieving carbon reduction.

A Venturi device with a primary flow path and a secondary flow path introduced into the primary flow path, wherein a flow of one or more flowable mediums in the primary flow path and the secondary flow path creates a vortex generating a suction at an inlet of the Venturi device. A particulate burner system can be used to combust fuel emission byproducts by injecting fuel and air into a housing having a bottom plate with a round bottom opening for burners to inject fuel into a combustion chamber and a top plate with a round top opening for exhausting fuel emissions. A thruster system can be used to propel munition for deep earth penetration by using a thruster system having a transfer cone connected to a munition body.

A fuel-fired burner includes a combustion air inlet for receiving combustion air coupled to a combustion air nozzle at an input to a second chamber within a burner housing spaced apart from a third chamber within the second chamber. The combustion air nozzle directs the combustion air into the third chamber. A fuel inlet coupled to a burner nozzle secured to a burner mounting plate has a recycle port for receiving hot exhaust gas provided to an exhaust gas path. A jet pump located entirely inside the burner housing is configured to receive the hot exhaust gas from the exhaust gas path. The jet pump operates by flowing the combustion air through the combustion air nozzle which suctions in the hot exhaust gas through the recycle port into the exhaust gas path then into a gas mixing zone for mixing the hot exhaust gas and the combustion air.

Processes and apparatuses for heating process fluid in a furnace. Fuel to the furnace is either hydrocarbons or hydrogen. The fuels may be sent to different furnaces or be sent at different times to the same furnace. Furnaces that are configured to receive both types of fuels may have different exhaust paths. An exhaust path for hydrocarbon fuel flue gas includes a carbon capture process zone.

A nozzle arrangement for a combustor (12) has at least one nozzle pair (43, 46) comprising a fuel gas nozzle (43) for injecting fuel gas, the fuel gas nozzle having a fuel gas nozzle longitudinal axis (62), and the fuel gas nozzle (43) being connected to a fuel gas distribution device (17); the nozzle pair further comprises a secondary gas nozzle (46) for spraying a secondary gas, the secondary gas nozzle (46) being connected to the secondary gas distribution device (45); wherein the fuel gas nozzle (43) is arranged at least partially inside the secondary gas nozzle (46) in the direction of the fuel gas nozzle longitudinal axis (62); the secondary gas nozzle (46) covers the fuel gas nozzle (43) in the circumferential direction around the fuel gas nozzle longitudinal axis (62).

An apparatus and process for oxidant formation can be configured to facilitate improved mixing of for formation of an oxidant. Embodiments can be configured so conduits having a relatively large aspect ratio (e.g., 1.5 to 5 or 1.5 to over 5) can be utilized for improved gas mixing even in situations in which the carrier gas is at a relatively low pressure. Embodiments can also facilitate low nitrogen oxide formation combustion. Some embodiments can additionally provide improved carbon capture.

The invention provides a combustor. The combustor comprises a combustor frame and a combustion head, a primary gas tube for supplying gaseous fuel to the furnace, which extends inside the combustion head in the longitudinal direction of the combustion head, the orifices of which open into or close to the furnace, a primary air supply tube also extending inside the combustion head and surrounding the primary gas tube; a flow duct for main combustion air extends inside the combustion head and surrounds the primary air supply pipe at least inside the end portion; and a set of main gas rods for supplying fuel to the furnace, arranged at least partially outside the cylindrical body of the combustion head, extending near the junction between the cylindrical body and the end portion such that they surround the body at equal intervals about the circumference thereof; a number of injector conduits associated with the primary gas rod are provided at an end portion of the combustion head for recirculating flue gas from the furnace into the gaseous fuel from the primary gas rod and further delivering the resulting flue gas-fuel mixture to the furnace.

A burner (1) for combusting metal powder, particularly iron powder, comprising a combustion chamber (2) containing a combustion space for holding a combustion flame during operation, the combustion chamber having an air inlet (3), a metal powder inlet (4), and a exhaust gas outlet (5), characterized in that the combustion chamber (2) has a recirculation channel (7) for recirculating exhaust gases, the recirculation channel (7) being in communication with the combustion space within said combustion chamber (2), and the recirculation channel (7) intersecting with the air inlet (3).

A modular combustion system for flexible energy generation is provided. The system comprises a plurality of combustion boilers, at least one oxidizer supply unit providing an oxidizer stream to the combustion boilers, at least one feeder to provide fuel to the combustion boilers, at least one particle removal unit to remove particles from a flue gas output stream from the combustion boilers, and a pollution removal unit to remove pollutant gases from the flue gas output stream. A process for flexible energy generation using the modular combustion system is disclosed that includes providing an oxidizer stream to a plurality of combustion boilers with at least one oxidizer supply unit, providing fuel to the plurality of combustion boilers with at least one feeder, removing particles from a flue gas output stream from the plurality of combustion boilers with at least one particle removal unit, and removing pollutant gases from a particle-free flue gas output stream with at least one pollution removal unit. A system for controlling wall heat flux in a pressurized coal combustion environment is disclosed that includes at least one burner; and at least one low-mixing, axial-flow boiler.

Method for calcination in an annular shaft furnace comprising a supply of material to be calcined at the top of an annular space (3) of the furnace into which the material descends, an introduction in (5) of first and in (6) of second combustion flue gases into this annular space, a discharge at the top of the furnace in (12) of an upper gas stream, a removal in (18) of a portion of the upper gas stream, a formation of a first oxidizing mixture by mixing this portion of the upper gas stream with pure dioxygen (19) and, to form the second combustion flue gases, a combustion of a fuel in this first oxidizing mixture, as well as an elimination in (20) of a lower gas stream containing the air for cooling the product, after said cooling.

A combustor configured to generate a flame in a combustion zone is provided, where the combustor includes a combustion air conduit providing combustion air to the combustion zone, a target gas conduit surrounded by the combustion air conduit, and a fuel gas conduit surrounding the combustion air conduit, the combustion system includes a target gas conduit surrounded by a target gas conduit that provides a target gas, such as a NOx reducing medium, to the combustion zone, and a fuel gas conduit surrounded by the target gas conduit that provides a fuel gas to the combustion zone where a portion of the fuel gas is mixed with a portion of the target gas and then mixed with combustion air in the combustion zone.

A burner includes an oxidant feed passage, a fuel feed passage surrounding the oxidant feed passage, an air feed surrounding the fuel feed passage, a movable air flow diverter and, optionally, a flame nozzle. The movable air flow diverter and / or flame nozzle are independently configured to create one or a plurality of gas recirculation regions adjacent the downstream tip of the burner to improve the mixing and reaction of the fuel and oxidant, and overall combustion process efficiency. A related furnace and method for generating a stable flame with the burner are also provided.

An apparatus and process can be configured for reduced nitrogen oxide formation during combustion. Embodiments can provide synthetic air to a combustion device so that combustion of a fuel can occur with a substantially low amount of NOx. Some embodiments can provide a reduction in NOx formation by at least 75% and as much as greater than 95% as compared to use of ambient air or oxygen enriched air oxidants. Embodiments can also provide a flue gas that has a high concentration of carbon dioxide that can facilitate improved carbon capture and permit efficient formation of at least one carbon dioxide product stream with a high carbon dioxide concentration (e.g. at least 95 mole percent carbon dioxide).

A recuperative burner (100; 100'; 300), at least comprising: - a burner base (10) and - a combustion chamber tube (30; 330), in which a least one burner nozzle (41) is positioned, at which at least one fuel gas line (42, 43) opens; - an exhaust gas recirculation device with a jet pump which is operated by combustion air and comprises a jet nozzle, the cross section of which decreases in the flow direction, with a jet pump annular gap (26; 226; 326) for the intake of exhaust gases from outside the combustion chamber tube (30; 230; 330) by means of an annular driving jet, wherein the exhaust gas recirculation device: - is configured upstream of the mixing plane of the fuel gases flowing into the combustion chamber tube (30; 230; 330), between the burner base (10) and the combustion chamber tube (30; 230; 330) - comprises at least one endless exhaust gas intake opening (34; 234; 334) and / or a peripheral, self-contained arrangement of a plurality of exhaust gas intake openings, from which at least one flow path leads into the interior of the combustion chamber tube (30; 330); characterized by a recuperator (20; 220; 320; 400), arranged upstream of the combustion chamber tube (30; 330), with a heat transfer body (21; 221; 321) which has at least two separate throughflow channels (101, 102; 201, 202; 301, 302) provided to conduct counterflowing fluids, wherein the at least two fluids enter / exit via inlet and outlet openings (23, 24; 323, 324) of the throughflow channels (101, 102; 201, 202; 301, 302) in the heat transfer body (21; 221; 321), and, of the fluids, one is formed by combustion air to be preheated and the other is formed by the exhaust gas of the recuperative burner (100; 300).

An air fired burner may be operated by controlling a composition of the burner air flow that is provided to a burner air intake of the burner, including initially having at least a majority proportion of atmospheric air, and over time, reducing the proportion of atmospheric air in the burner air flow and increasing a proportion of a synthetic air that is derived at least in part from the exhaust gas flow produced by the burner, until the proportion of atmospheric air in the burner air flow is reduced to a minimal proportion, wherein as the proportion of atmospheric air is reduced and the proportion of the synthetic air is increased, a carbon dioxide concentration of the exhaust gas flow increases.

Disclosed is a combustion method in a furnace, e.g. a glass furnace. A fuel mixture, optionally comprising recirculated flue gas, comprises fuel components that undergo an endothermic reforming reaction while being indirectly heated utilizing the heat of the furnace flue gas in order to improve heat recovery efficiency. The heat exchanger may be of the regenerator type.

This invention relates to a combustion device and a gas-fired hot water equipment. A circulation pipe is installed between the mixing chamber and the exhaust structure, allowing some of the flue gas from the exhaust structure to be guided into the mixing chamber and then into the gas supply channel to mix with the gas. After mixing, the gas is then uniformly transported to the burner for combustion via the gas supply channel. Because the mixing chamber restricts the entry of primary air, the flue gas can completely replace the primary air during mixing, preventing the gas from mixing with primary air again before entering the gasifier. Furthermore, the oxygen concentration in the flue gas is much lower than that in the air, approximately 1 / 3 to 1 / 2. Therefore, during the gas mixing process, the mixture effectively avoids reaching combustible concentration conditions, effectively improving the combustion characteristics of the mixture, reducing the risk of combustion explosion, and ensuring stable combustion.

A method for combusting fuel in stages by feeding combustion air (28) into a burner tube (12). A first fuel quantity is fed to form a primary flame (24) in the burner tube. A second fuel quantity is fed downstream to form a main flame front (26). The main flame front (26) stabilizes downstream of the burner tube (12) and is spaced apart from the burner tube (12). The fuel feed is designed such that the primary flame (24) burns at a stoichiometric ratio greater than 1.5, in particular greater than 2.0.

The invention relates to a method for burning waste on a combustion grate of a combustion plant and a device for carrying out such a method, in which oxygen is added to the combustion with a carrier gas as an oxygen-carrier gas mixture, which is recirculated gas from the combustion plant with a CO2 concentration of 10 to 99%.

Heating apparatus (10, 100, 200, 300) comprising both a brazier (11) which in turn comprises a first entry aperture (16) to receive a biomass (C) which functions as fuel and a second aperture (18) to receive a first comburent (F1), and also a combustion chamber (20) which is autonomous with respect to said brazier (11), the heating apparatus (10, 100, 200, 300) being delimited by a plurality of walls (22, 23, 24, 25, 26) and suitable to develop heat by means of a flame.

A burner apparatus and method which provide an increased amount of internal flue recirculation for reducing NOx emissions by ejecting a series of surrounding, primary fuel streams and also ejecting on one or more subsequent series of surrounding fuel streams outside of the burner wall toward the burner combustion wherein each succeeding series of surrounding fuel streams must travel a greater distance to the combustion zone and each series of surrounding fuel streams must contact one or more radial impact structures provided on the exterior of the burner wall.

A homogeneous charge continuous oxidation system for generating heat can include a fuel gas source, an oxygen source, and a carbon dioxide source. The oxygen source can include oxygen gas that is substantially free of nitrogen or that contains nitrogen in an amount less than 10 vol %. The system can also include an oxidation chamber including an oxidation product outlet and at least one inlet connected to the fuel gas source, the oxygen source, and the carbon dioxide source to receive a gas mixture of fuel gas, oxygen, and carbon dioxide. A body of porous material can be within the oxidation chamber and positioned in a flow path of the gas mixture between the at least one inlet and the oxidation product outlet such that oxidation occurs within the body of porous material.

A method and apparatus for operating a flare stack pilot with a fuel having a high flame speed includes a structure which is operable to recirculate products of combustion to be mixed with the incoming fuel to dilute the incoming fuel to reduce the flame speed of the resulting mixture.

The combustion system comprises a bypass (6) which opens to the open air during two different operating modes (M1 / "conventional combustion"; M2 / "oxy-combustion"), and which has the function, on the one hand, in the two operating modes (M1; M2), when the discharge valve (V3) is at least partially open and the recycling valve (V2) is closed or open, of allowing air to enter the recycling loop (40), and which has the function, on the other hand, in the second operating mode (M2), when the discharge valve (V3) is closed and the recycling valve (V2) is open, of allowing a surplus (G2) of the combustion gas (G) produced by the combustion device (1) to be discharged from the recycling loop (40), the other fraction (G1) of the combustion gas (G) produced by the combustion device (1) supplying the mixer (31).

The present invention relates to a bright radiator comprising a burner (1, 5), a fan (3) and a radiation plate (12) having a plurality of flame passages acting as a radiation surface, the burner (1, 5) being connected to a fuel gas supply, the fan (3) being configured to supply combustion air to the burner (1, 5), and the burner (1, 5) being configured to cause a surface of the radiation plate (12, 52) to glow red, the fuel gas supply being connected to a hydrogen source as a fuel gas source.

A combustion system includes a combustion chamber for generating energy. The system includes a first inlet for supplying an oxidant into the chamber and a second inlet for supplying a fuel into the chamber. The system also includes a third inlet in fluid communication with the first inlet for supplying oxygen into the chamber. The system further includes a fourth inlet for supplying hydrogen into the chamber. A circulation line is used to deliver a flue gas from the chamber to the first inlet.

Method of a burner head for the staged combustion of a fuel with the supply of combustion air (28) into a burner tube (12). A first quantity of fuel is supplied to form a primary flame (24) within the burner tube. A second quantity of fuel is supplied downstream to form a main flame front (26). The main flame front (26) stabilizes downstream of the burner tube (12) and at a distance from the burner tube (12). The fuel supplies are designed such that the primary flame (24) burns with a stoichiometry greater than 1.5, in particular greater than 2.0.

A combustor (40) includes a housing (41) having an open first end and a closed second end (41b), an inlet that introduces fuel and oxidizing gas into the housing (41) such that a tubular flow (F1) is generated in the housing (41), an ignition plug (44) disposed at the second end (41b), and an ignition unit that generates a spark (P1) between a positive electrode (45) and a negative electrode (46). The positive electrode (45) and the negative electrode (46) are each located at a position where a distance (L1) between them is shorter than a distance (L2) between the positive electrode (45) and an inner circumferential surface (41d) of the housing (41) such that a flame (P2) generated between the positive electrode (45) and the negative electrode (46) by the spark (P1) is formed only in a negative pressure region (A1).

A venturi device having a primary flow path and a secondary flow path introduced into the primary flow path, wherein the flow of one or more flowable media in the primary and secondary flow paths forms a vortex that creates suction at an inlet of the venturi device. The particulate burner system can be used to combust fuel exhaust by-products by injecting fuel and air into a housing having a bottom plate with a circular bottom opening through which the burner injects fuel into a combustion chamber and a top plate with a circular top opening through which the fuel exhaust is exhausted. The thruster system can be used to propel a deep earth penetrating munition by using a thruster system having a transfer cone connected to the munition body.