57results about "Fluegas recirculation" patented technology

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).

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.

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%.

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 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.

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).

The invention relates to a method and an arrangement for using at least one property of the air in a combustion air path (21, 22) of a gas-fired heating appliance (1) for measuring exhaust gas recirculation and for its control and / or condition analysis, wherein the property is measured by means of at least one sensor (17, 19) and its behavior is compared with empirical values ​​or calibration data in relation to known processes in the heating appliance (1), so that changes in the property can be detected and used for controlling the heating appliance (1) and / or for status messages. The invention enables increased operational safety and a reduction in tolerance limits in the control of a heating appliance (1), so that it can be operated more efficiently and robustly, at least under certain conditions.

A coal-fired flue gas treatment system and method is provided. The coal-fired flue gas treatment system includes a carbon dioxide capture and recovery system and a decarbonization gas concentration system; the carbon dioxide capture and recovery system is connected with a coal-fired device, and the carbon dioxide capture and recovery system performs recovery treatment on carbon dioxide from coal-burning flue gas generated by the coal-fired device; the decarbonization gas concentration system is connected with the carbon dioxide capture and recovery system and the coal-fired device, and the decarbonization gas concentration system performs concentration treatment on coal-fired flue gas after recovery treatment and sends gas containing concentrated carbon monoxide to the coal-fired device. According to the disclosure, the recovered coal-fired flue gas is performed concentration treatment and sent to a coal-fired device.

A liquid or gaseous fuel burner has a supply circuit for supplying a liquid or gaseous fuel to a burner head (2); a first pneumatic circuit (3) configured to supply oxidation air to the combustion head (2) and provided with first valve means (7); and a second pneumatic circuit (4) configured to feed a flow of combustion fumes from the combustion head (2) into the first pneumatic circuit (3) and provided with second valve means (11) movable between a closed position and an open position of the second pneumatic circuit (4) and third valve means (12) movable between a closed position and an open position of the second pneumatic circuit (4). Third valve means are connected to the first valve means (7) to move between a closed position of the second pneumatic circuit (4) and a plurality of open positions for each open position of the first pneumatic circuit (3), and selectively control the emission of nitrogen oxides NOx. The liquid or gas fuel burner provided by the utility model has relatively many operation modes and relatively strong multifunctionality.

The present invention relates to a system (S1) for generating thermal energy from the combustion of metal particles, comprising a metal particle burner in a combustion chamber (4), means (100) for injecting metal particles into the burner means, means (5, 6) for introducing air to form a premixture of air and the metal particles, means for capturing oxidized particles in the exhaust gases, either downstream of or associated with the first heat exchange means, and a heat exchanger (7) for exchanging heat between a transfer fluid and the combustion chamber (4) to transfer a portion of the thermal energy of the combustion to a user device (13). The system further comprises a loop (20) for recirculating a first fraction (22) of the exhaust gases coming from the combustion chamber (4), the loop having a gas extraction inlet downstream of the combustion chamber (4) and a gas injection outlet upstream of the burner means (3).

Combustion method for a glass furnace with a non-catalytic conversion furnace, wherein the system required for combustion comprises a glass furnace, a non-catalytic conversion furnace A, a non-catalytic conversion furnace B, a flue gas recovery device, a chimney, a high-temperature flue gas fan, a natural gas supply device and an oxygen supply device; wherein the non-catalytic conversion furnace A and the non-catalytic conversion furnace B are arranged on two sides of the glass furnace and connected to the glass furnace; wherein the non-catalytic conversion furnace A and the non-catalytic conversion furnace B are switchably connected to an inlet of the flue gas recovery device and an outlet of the flue gas recovery device is each connected to the chimney and the high-temperature flue gas fan, the high-temperature flue gas fan being connected to the bottom of the non-catalytic conversion furnace A and the bottom of the non-catalytic conversion furnace B; wherein the natural gas supply device is switchably connected to the bottom of the non-catalytic conversion furnace A, the upper part of the non-catalytic conversion furnace A, the bottom of the non-catalytic conversion furnace B, the upper part of the non-catalytic conversion furnace B and the glass furnace, the oxygen supply device is connected to the glass furnace; wherein an oxygen content analyzer, a flow meter, a temperature sensor and a pressure sensor are provided on a pipe through which the high-temperature flue gas fan is connected to the bottom of the non-catalytic conversion furnace A and the bottom of the non-catalytic conversion furnace B, wherein a flow control valve and a pressure sensor are provided on a pipe through which the natural gas supply device is connected to the bottom of the non-catalytic conversion furnace A, the upper part of the non-catalytic conversion furnace A, the bottom of the non-catalytic conversion furnace B, the upper part of the non-catalytic conversion furnace B and the glass furnace, and wherein a flow control valve and the pressure sensor are provided on a pipe through which the oxygen supply device is connected to the glass furnace; the combustion process includes the following steps: 1) In the initial phase, combustion is promoted by means of air, and after the generation of the flue gas, the circulating flue gas is mixed with oxygen and used as a combustion improver to gradually replace the promotion of combustion with air, whereby after a certain time of the cycle the circulating flue gas contains high levels of water vapor and carbon dioxide, and the circulating flue gas and the oxygen completely replace the promotion of combustion with air, at which point the system enters its normal operating state; 2) Conversion and Reforming Phase: When the oxygen content in the circulating flue gas is less than or equal to a set limit, the circulating flue gas enters the furnace from the bottom of the non-catalytic conversion furnace A, and natural gas also enters the furnace from the bottom of the non-catalytic conversion furnace A, whereby the natural gas undergoes a conversion and reforming reaction with water vapor and carbon dioxide in the circulating flue gas, producing hydrogen and carbon monoxide, namely high-calorific-value water gas, which are fed into the glass furnace, whereby oxygen is fed into the glass furnace and undergoes a combustion reaction with carbon monoxide and hydrogen produced by non-catalytic conversion and a small amount of natural gas that does not undergo a conversion and reforming reaction;wherein the circulating flue gas, when the oxygen content in the circulating flue gas is greater than the set limit, enters the furnace from the bottom of the non-catalytic conversion furnace A, and natural gas enters the furnace from the upper part of the non-catalytic conversion furnace A, wherein natural gas undergoes a conversion and a reforming reaction with water vapor and carbon dioxide in the circulating flue gas, thereby producing hydrogen and carbon monoxide, namely high-calorific-value water gas, which are fed into the glass furnace, wherein oxygen is fed into the glass furnace and undergoes a combustion reaction in the glass furnace with carbon monoxide and hydrogen produced by non-catalytic conversion and a small amount of natural gas that does not undergo a conversion and reforming reaction; ; 3) Flue gas purging phase: After completion of the conversion and reforming phase, the natural gas is fed directly into the glass furnace and the circulating flue gas enters the furnace from the bottom of the non-catalytic conversion furnace A to purge, replace and convert the remaining combustible gas, and enters the glass furnace, with oxygen being fed into the glass furnace to undergo a combustion reaction; 4) Heating phase of the conversion furnace: In the conversion and reforming phase and the flue gas purging phase, high-temperature flue gas from the outlet of the glass furnace enters the non-catalytic conversion furnace B to heat the furnace and store heat, and then enters the flue gas recovery device to recover heat and be dedusted and desulfurized, after which part is pressurized by the high-temperature flue gas fan and then introduced into the circulation of the non-catalytic conversion furnace A, while the remainder is discharged through the chimney or undergoes a CCUS process; 5) After a certain time, the non-catalytic conversion furnace A / B is switched over, that is, a conversion and a reforming reaction take place in the non-catalytic conversion furnace B, and the non-catalytic conversion furnace A heats up and heat is stored there; such a switching is repeated cyclically.

A method is proposed for operating a heating appliance (1) configured for the combustion of a fuel gas in a burner (3) of the heating appliance (1) with a hydrogen content of at least 80%. The heating appliance (1) comprises a combustion air supply (4) (17) and an exhaust gas outlet, wherein exhaust gas (16) from the exhaust gas outlet can pass into the combustion air supply (4) (17) at a recirculation point (21). The method comprises at least the following steps: a) Recording an exhaust gas temperature T A , b) Measuring a combustion air temperature T L at a measuring point in the recirculation point (21) or, viewed in a flow direction (24) of the heating device (1), downstream of it, c) Determining irregular exhaust gas recirculation based on the exhaust gas temperature T recorded in step a). A and the combustion air temperature T recorded in and step b). L. In addition, a heating device (1), a computer program product (14) and a use of recorded temperatures are proposed.

A system and method for reducing NOx in a burner assembly utilizes simultaneous emission high-pressure staged fuel and low-pressure primary / stability fuel on a burner tile to achieve low-pressure stability with high-pressure firing.

A system and method for reducing NOx in a burner assembly utilizes simultaneous emission high-pressure staged fuel and low-pressure primary / stability fuel on a burner tile to achieve low-pressure stability with high-pressure firing.

Combustor apparatus and methods providing increased internal flue recirculation for reducing NO x emissions by injecting a series of surrounding primary fuel streams outside the combustor wall toward the combustor combustion section and also injecting one or more subsequent series of surrounding fuel streams, where each subsequent series of surrounding fuel streams must travel a further distance to reach the combustion zone and each series of surrounding fuel streams must contact one or more radial impingement structures disposed on the outside of the combustor wall.

Burner system for a radiant section of a steam cracking furnace configured to provide heat to the radiant section, the burner system including a fuel inlet and an oxidant inlet, and further comprising an ejector block arranged located within the radiant section and to receive a propellant and a propelled fluid and arranged to premix said propellant with said propelled fluid.

A waste incineration facility (1) includes an incinerator (3) that incinerates waste, a flue gas passage (4) through which a flue gas discharged from the incinerator (3) flows, a dust collector (42) provided in the flue gas passage (4), a recirculating flue gas line (6) that is connected to a discharge position (P1) located downstream of the dust collector (42) in the flue gas passage (4) and that takes out, as a recirculating flue gas, part of the flue gas flowing through the flue gas passage (4) to supply the recirculating flue gas into the incinerator (3), and an oxygen mixer (68) that mixes the recirculating flue gas flowing through the recirculating flue gas line (6) with a high-concentration oxygen gas that has a higher oxygen concentration than air. Accordingly, it is possible to easily reduce the amount of flue gas.

Disclosed is a staged-air burner device capable of high energy efficiency, high flame stability- combusting multiple readily switchable fuels ranging from pure hydrogen, to any hydrogen / methane mixture, to pure methane, and generating a low level of NOx. 'The burner device can include: a primary air chamber receiving a primary air and a flue gas; a burner tube capable of receiving a fuel jet and drawing in the air-flue gas mixture from the primary air chamber: a. burner tip discharging the fuel-air-flue gas mixture formed in the burner tube to a first combustion zone and a second combustion zone via center orifices and side orifices on the burner tip, respectively, and a staged air chamber receiving staged air and discharging it via staged air ports into a. third combustion zone. Combustion of the fuel occurs in at least one of the first, second, and third combustion zones.

An apparatus and method for oxidant formation may be configured to facilitate improved mixing for forming an oxidant. Embodiments may be configured such that conduits having a relatively large aspect ratio (e.g., 1.5 to 5 or 1.5 to more than 5) may be used to improve gas mixing, even in cases where the carrier gas is at a relatively low pressure. Embodiments may also promote low nitrogen oxide formation combustion. Some embodiments may additionally provide improved carbon capture.

To quickly create a great amount of combustion gas by using a combustor.SOLUTION: A combustor 40 has: a circular tubular box body 41 which is open at a first end, and closed at a second end 41b, and through which there flow an ammonia gas mixed with air, and a combustion gas generated by combustion of the ammonia gas; an introduction part for introducing the ammonia gas and the air into the box body 41 so that a tubular flow F1 is generated; an ignition plug 44 arranged at the second end 41b side in the box body 41, and having a positive electrode 45 and a negative electrode 46; and an ignition unit for generating a spark P1 between the positive electrode 45 and the negative electrode 46. A negative pressure region A1 is formed in one portion in the box body 41. The positive electrode 45 and the negative electrode 46 are arranged respectively at positions which make a distance L1 between the positive electrode 45 and the negative electrode 46 shorter than a distance L2 between the positive electrode 45 and an internal peripheral face 41d of the box body 41 so that a flame P2 generated between the positive electrode 45 and the negative electrode 46 by the spark P1 is formed only within the negative pressure region A1.SELECTED DRAWING: Figure 5

The invention relates to a device (2) and a method for supplying combustion air and for recirculating exhaust gas for a burner (1) comprising a combustion chamber (10) and to a burner (1) comprising a device (2) for supplying combustion air and for recirculating exhaust gas. Multiple drive nozzles (21) distributed about a central axis (A) are used to supply combustion air to a mixing chamber (22) arranged downstream of the drive nozzles (21) by suctioning exhaust gases out of the combustion chamber (10); the combustion air exiting the drive nozzles (21) is mixed with exhaust gases in the mixing chamber (22) in order to form a combustion air / exhaust gas mixture, said exhaust gases flowing out of the combustion chamber (10) and being backflushed by means of the drive nozzles (21); and the combustion air / exhaust gas mixture is supplied to a reaction zone downstream of the mixing chamber (22).

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.

The invention relates to a method for operating a gas burner, in which method: a mixture is formed from a fuel gas and air in a mixing chamber (1); the mixture is conveyed at a controlled feed rate through an outlet opening (2) in a burner surface (3) delimiting the mixing chamber (1); the mixture is combusted at the burner surface (3) to form a recirculation vortex; and exhaust gas forming during the combustion is brought into contact with a fluid-cooled heat exchanger (4) located at a distance from the outlet opening (2). According to the invention, the feed rate for the mixture and the distance between the outlet opening (2) and the heat exchanger (4) are selected in such a way that the recirculation vortex extends from the outlet opening (2) to the heat exchanger (4) and is cooled down at the heat exchanger (4).

A method is proposed for operating a heating appliance (1) designed to combust a fuel gas at a burner (3) of the heating appliance (1) with a hydrogen content of at least 80%. The heating appliance (1) comprises a combustion air supply (4) (17) and an exhaust gas outlet, wherein exhaust gas (16) from the exhaust gas outlet can pass into the combustion air supply (4) (17) at a recirculation point (21). The method comprises at least the following steps: a) recording an exhaust gas temperature TA, b) recording a combustion air temperature TL at a measuring point in the recirculation point (21) or, viewed in a flow direction (24) of the heating appliance (1), downstream thereof, c) detecting irregular exhaust gas recirculation based on the exhaust gas temperature TA recorded in step a) and the combustion air temperature TL recorded in step b).In addition, a heating device (1), a computer program product (14) and a use of recorded temperatures are proposed.

A method of generating a flame from combustion of a fuel, includes moving an oxidant feed through an oxidant feed passage; moving a fuel feed through a fuel feed passage surrounding the oxidant feed passage; moving an air feed containing oxidant within an air feed region surrounding the fuel feed passage along the fuel feed passage; creating a gas recirculation region immediately downstream from the air feed and the fuel feed passage; diverting the air feed for proportioning the air feed around the fuel feed passage for controlling flame stabilization in the gas recirculation region; and igniting a resulting gas mixture.

A carbon sequestration system includes a furnace having an oxy-combustion burner, a mill configured to receive a fuel and to provide the fuel to the oxy-combustion burner, a waste heat recovery exchanger configured to receive a flue gas from the furnace, the flue gas ultimately supplied to one or more of an overfire air port of the furnace, the oxy-combustion burner, the mill, and a CO2 purification unit, the CO2 purification unit configured to produce a purified CO2 stream.

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).

A combustion system including a bypass which opens to the open air during two different operating modes (“conventional combustion”; “oxy-combustion”), and which has the function, on the one hand, in the two operating modes, when the discharge valve is at least partially open and the recycling valve is closed or open, of allowing air to enter the recycling loop, and which has the function, on the other hand, in the second operating mode, when the discharge valve is closed and the recycling valve is open, of allowing a surplus of the combustion gas produced by the combustion device to be discharged from the recycling loop, the other fraction of the combustion gas produced by the combustion device supplying the mixer.

The invention relates to a nozzle arrangement for a burner (12) having at least one pair of nozzles (43, 46) with a fuel gas nozzle (43) having a fuel gas nozzle longitudinal axis (62), for injecting fuel gas, the fuel gas nozzle (43) being connected to a fuel gas distribution device (17), and with a secondary gas nozzle (46) for injecting secondary gas, the secondary gas nozzle (46) being connected to a secondary gas distribution device (45), the fuel gas nozzle (43) being arranged along the fuel gas nozzle longitudinal axis (62) at least partially inside the secondary gas nozzle (46), and the secondary gas nozzle (46) surrounding the one fuel gas nozzle (43) in the circumferential direction around the fuel gas nozzle longitudinal axis (62).

A burner arrangement for a facility (1) for producing asphalt comprises: a rotary kiln (9) which can be driven in rotation about an axis of rotation (29) for drying material; a burner (12) coupled to the rotary kiln (9) for supplying heat to the rotary kiln (9), the burner (12) comprising an air line (19) connected to the burner (12) for supplying air, a fuel gas line (14) connected to the burner (12) for supplying fuel gas, and at least one secondary gas line (24, 35) connected to the burner (12) for supplying secondary gas.