104results about "Fluegas recirculation" patented technology

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).

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 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.

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%.

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.

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.

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 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.

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.

A grate arrangement and a method for use in a fluidized-bed boiler. The arrangement comprises a grate having length and width defining the area of said grate, plurality of gas feeding means being distributed on the area of the grate, a gas supply system connected to the plurality of gas feeding means for supplying fluidizing gas above the grate, and a booster gas supply system connected to at least some of the plurality of gas feeding means for supplying booster gas above the grate. The gas feeding means are grouped in at least two feeding groups, each of which feeding groups is extending only to a subarea of the area of the grate. Controlling means are arranged for controlling the systems so that while at least one of the feeding groups is open to the gas supply system for feeding fluidizing gas above the grate, at least one another of the feeding groups is closed to said gas supply system and open to the booster gas supply system.

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 cylindrical burner apparatus and method which produce low noise levels and are not dependent upon a blower, or natural draft, for providing combustion air flow. A flow of combustion air is induced into a rearward end of a burner tube and a swirling flame is produced in the tube by discharging a gas fuel from a plurality of discharge ports located in the tube.

The present invention relates to a system for reducing fuel consumption and recovering CO2, comprising: a water electrolysis facility system for producing hydrogen and oxygen from water or steam; a combustion facility for combusting fuel by using the produced oxygen; and a CO2 recovery facility for recovering CO2 from an exhaust gas discharged from the combustion facility.

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.

The present invention discloses a flue gas recirculation nitrogen-free combustion coupled with carbon dioxide capture process system and method. A cooling section of a flue gas pre-cooling system, a cooling section of a first heat exchanger, a first separator, a blower, a cooling section of a second heat exchanger, a cooling section of a third heat exchanger, a molecular sieve adsorption tower, a refrigeration unit and a re-absorption tower are sequentially connected to the flue gas outlet of the boiler and burner system; two paths of CO2 in the re-absorption tower perform heat exchange, one path outputs liquid CO2, and the other path is sequentially connected to the heating section of the second heat exchanger and the heating section of the first heat exchanger; the nitrogen-containing non-condensable gas outlet of the re-absorption tower is sequentially connected to the heating section of the third heat exchanger and a pressure swing adsorption nitrogen removal system; an air separation system, a pressure swing adsorption nitrogen removal system and the heating section of the first heat exchanger are connected to the boiler and burner system through the heating section of the flue gas pre-cooling system. The present invention integrates the functions of oxy-fuel combustion, flue gas circulation and carbon dioxide capture and purification, and has the advantages of zero pollution emission and high efficiency.

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.