EP4253838A1 - Gasbrenner mit niedriger nox-emission - Google Patents

Gasbrenner mit niedriger nox-emission Download PDF

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Publication number
EP4253838A1
EP4253838A1 EP22166388.3A EP22166388A EP4253838A1 EP 4253838 A1 EP4253838 A1 EP 4253838A1 EP 22166388 A EP22166388 A EP 22166388A EP 4253838 A1 EP4253838 A1 EP 4253838A1
Authority
EP
European Patent Office
Prior art keywords
primary
gas
fuel gas
main
gas burner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22166388.3A
Other languages
English (en)
French (fr)
Inventor
Willem Pieter Jacobus Pastoor
Marco Anton Frederik DERKSEN
Franciscus Adrianus Maria Knijnenburg
Marcus Theodorus van der Cruijsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combustion2 BV
Original Assignee
Combustion2 BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Combustion2 BV filed Critical Combustion2 BV
Priority to EP22166388.3A priority Critical patent/EP4253838A1/de
Priority to PCT/EP2023/058597 priority patent/WO2023187215A1/en
Publication of EP4253838A1 publication Critical patent/EP4253838A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00—Staged combustion
    • F23C2201/20—Burner staging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/20—Premixing fluegas with fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling

Definitions

  • the invention relates to a gas burner, and a method for burning gas.
  • a hydrogen gas combustion burner device 1 has a return pipe 15 which has one end communicated with a combustion space 11 a and which recirculates a part of a combustion exhaust gas generated by combustion by hydrogen gas and air in a combustion space 11 a.
  • a hydrogen gas supply pipe 12 has an exhaust gas introduction port 12 b which is provided on an upstream side of an injection port 12 a and which is connected with the other end of a return pipe 15 opposite to the combustion space 11 a to introduce a combustion exhaust gas into the hydrogen gas supply pipe 12."
  • the invention discloses a fuel-side flue gas recirculation low-nitrogen combustor and a combustion method thereof.
  • the fuel-side flue gas recirculation low-nitrogen combustor comprises a pilot fuel pipe, an air flow channel, a main fuel mixing channel, a fuel distribution ring pipe and a recirculating flue gas distribution ring pipe.
  • Fuel forms main fuel and pilot fuel through the fuel distribution ring pipe, and the main fuel and recirculating flue gas are rapidly mixed through the main fuel mixing channel to form mixed flue gas fuel which is then jetted into a combustion chamber.
  • the pilot fuel is pre-mixed with central air in a pilot fuel pre-mixing cavity to form a swirling lean fuel pre-mixed pilot flame in a swirling disc.
  • the rest of air forms a high-speed jet through an annular air nozzle between the pilot fuel premixing cavity and the air flow channel and is quickly mixed with the mixed flue gas fuel, flameless combustion of the main fuel is achieved, and the generation of NOX is greatly reduced.
  • the fuel-side flue gas recirculation low-nitrogen combustor and the combustion method thereof have the advantage of stable combustion, solve the contradiction between great reduction of the oxygen content in low-NOx combustion and combustion stability, and can achieve low-NOx emission.”
  • a disadvantage of prior art, as mentioned, is that measures to reduce NOx emission in gas burners have setbacks in view of condensation, reduced efficiencies, reduced reliability. For instance, when not in operation, channels are filled with air and these cause high local temperatures upon (re-)ignition
  • a gas burner (1) for burning a fuel gas using fuel staging said gas burner having a center line A and comprising:
  • a method for burning fuel gas comprising a combustion chamber and a gas burner extending into said combustion chamber, said method comprising providing a primary flame via said gas burner in said combustion chamber, introducing fuel gas around said primary flame, and introducing recirculated exhaust gas via said gas burner around said primary flame upstream of said primary flame for in operation mixing said exhaust gas into said main fuel before igniting into said main flame.
  • the presented design provides low NOx emission for hydrocarbon gas as fuel gas.
  • the presented gas burner also provides a low NOx emission when using hydrogen as fuel gas. In fact, in both uses the resulting efficiencies and reliability are high. Furthermore, Condensation remains low.
  • NOx In combustion processes with air as oxidant, NOx usually forms at temperatures above 1500 degrees Celsius.
  • the current gas burner design allows a low NOx emission while maintain a high efficiency.
  • Fuel gas comprises but is not limited to hydrogen, natural gas and other fuels that are in gaseous state when entering the burner and which have a lower heating value typically above 10 MJ/m3 at room temperature, or any mixtures thereof.
  • Fuel gas can be a mixture of (these) gasses.
  • fuel gas mainly comprises natural gas.
  • fuel gas comprises mainly hydrogen. Hydrogen is mostly provided in a highly pure form.
  • Fuel gas can be a mixture of gasses. Such a mixture can comprise methane, hydrogen, and further lower hydrocarbon gas.
  • the current gas burner is for instance used in an assembly producing 2-50 MW of thermal heat input. More in particular, it is used in an assembly producing 3-50 MW. More in particular, the gas burner is used in an assembly producing 5-50 MW. More in particular, the gas burner is used in an assembly producing 5-35 MW. More in particular, the gas burner is used in an assembly producing 5-25 MW. Specifically, it is used in an assembly producing 5-15 MW. More than one of the current gas burners can be used in one hearth.
  • the current gas burner When properly operated, the current gas burner can be operated to result in a low NOx emission.
  • the gas burner can be operated with flue gasses still comprising oxygen but no unburnt fuel or combustion still taking place.
  • NOx emission can be lower than 30 mg/m 3 of flue gas.
  • the primary flame is a central flame that receives its fuel gas from the primary fuel gas discharge opening.
  • the primary flame furthermore receives its oxygen mainly from the primary air discharge opening.
  • a primary flame When operating the current gas burner, a primary flame is ignited and is set for proper burning.
  • the main fuel gas is introduced with the exhaust gas from the installation recirculated and introduced functionally around the primary flame.
  • a flame detector will be used to provide feedback for controlling the process of starting and operating the current gas burner.
  • an exhaust gas discharge opening In the current gas burner, there is provided an exhaust gas discharge opening. This discharge opening is provided for introducing exhaust gas. In an embodiment, at least apart of the exhaust gas is recirculated for an exhaust outlet from an installation in which the current gas burner is installed.
  • the current gas burner is suited for burning hydrogen, natural gas or mixtures thereof.
  • the gas burner is also suitable for comparable high caloric gaseous fuels in an industrial Fire Tube Boiler, in particular having an output of more than 3MW.
  • the gas burner is suitable for water-tube boilers.
  • the current design enables an ultra-low NOx emission without compromising:
  • the series of main fuel gas discharge openings are arranged around the gas burner center line (A).
  • the series of exhaust gas return discharge openings are arranged around the gas burner center line (A).
  • the series of exhaust gas discharge openings are provided downstream of a start of said primary flame (P).
  • the first fraction is 1-35% of said fuel gas and said second fraction is 99-65 % of said fuel gas.
  • the first fraction is 2-30% of said fuel gas and said second fraction is 98-70 % of said fuel gas. More in particular, the first fraction is 5-20% of said fuel gas and said second fraction is 95-80 % of said fuel gas.
  • the gas burner further comprises a primary air discharge opening for introducing primary air into said primary flame region (P).
  • the primary air discharge opening extends up to said primary flame region. More in particular the primary fuel gas inlet discharge opening has its central axis concentric with said center line (A).
  • the gas burner further comprises a sleeve surrounding said series of main fuel gas inlet discharge openings and said series of exhaust gas return discharge openings.
  • the sleeve extends up at said main flame region (M).
  • the sleeve at its downstream end continuing in a tapering ring extending up to said main flame region (M). More in particular said tapering ring has its upstream start at said primary flame region (P).
  • the tapering ring comprises a downstream end, wherein at said downstream end parts of said tapering ring are taken out of said downstream end of said tapering ring.
  • bites or indentions are taken out of the tapering ring.
  • these indentations are provided at, or are aligned with, each main fuel gas discharge opening.
  • the sleeve, the primary air discharge opening and the primary fuel gas discharge opening are functionally concentric.
  • a spacing between said sleeve and said primary air discharge opening defines a main air discharge opening.
  • the gas burner comprises an end plate at the end of the primary fuel gas discharge opening.
  • the end plate is at said upstream start of said tapering ring.
  • the end plate comprises a central opening on said center line (A).
  • the primary fuel gas discharge opening is positioned upstream of said central opening.
  • the end plate comprises radial slits.
  • these radial slits start at a distance from the central opening. In an embodiment they extend radially up to a distance from an edge of said end plate. These slits are positioned in such a way that the provide primary air discharge openings.
  • the end plate closes off said primary air discharge opening. In this way the slits provide air discharge openings.
  • an end opening of the tapering ring has a circumference that is larger than a circumference of said end plate.
  • the main fuel gas discharge openings comprise a bent end which bends tangential with respect to a circle around said center line A.
  • the main fuel gas discharge openings are grouped into pairs.
  • the bent ends bend towards each other.
  • the main fuel gas discharge opening is positioned downstream of the end plate.
  • the main fuel gas discharge opening is upstream of an end of said tapered ring.
  • the exhaust gas discharge opening is positioned at an upstream end of said tapered ring.
  • the exhaust gas discharge opening is provided between a pair of main fuel gas discharge openings.
  • the exhaust gas discharge opening is upstream of the end plate.
  • the gas burner is for burning hydrogen gas.
  • the end plate comprises 3-6 auxiliary passages around said main opening. , and a series of primary fuel discharge openings at each auxiliary passage.
  • the end plate comprises radial slits.
  • the auxiliary passages are provided between these radial slits.
  • the primary fuel discharge openings are in substantially tangential direction with respect to a circle around the center line A.
  • the primary fuel gas discharge openings are at bent ends of primary fuel conduits.
  • a gas burner as described for burning a fuel gas mainly comprising hydrogen.
  • a fuel gas mainly comprising hydrogen.
  • hydrogen In particular at least 90% wt. Hydrogen. More in particular at least 95% wt. hydrogen. Specifically at least 99% wt. hydrogen.
  • a gas burner for burning a fuel gas mainly comprising methane In particular at least 90% wt. hydrogen. More in particular at least 95% wt. hydrogen. Specifically at least 99% wt. hydrogen.
  • upstream and downstream relate to an arrangement of items or features relative to the flow of fuel gas, wherein relative to a first position within a gas burner, a second position in the gas burner closer fuel gas inlet “upstream”, and a third position within the gas burner further away from the gas inlet is “downstream”.
  • upstream means further into the gas burner and towards the air fan counter to the direction of the main air flow
  • downstream means further away from the gas burner in the boiler, i.e. along the main flow direction of the gases.
  • substantially herein, such as in “substantially all emission” or in “substantially consists”, will be understood by the person skilled in the art.
  • the term “substantially” may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially may also be removed.
  • the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.
  • the term “comprise” includes also embodiments wherein the term “comprises” means “consists of'.
  • the term “functionally” is intended to cover variations in the feature to which it refers, and which variations are such that in the functional use of the feature, possibly in combination with other features it relates to in the invention, that combination of features is able to operate or function. For instance, if an antenna is functionally coupled or functionally connected to a communication device, received electromagnetic signals that are receives by the antenna can be used by the communication device.
  • the word “functionally” as for instance used in “functionally parallel” is used to cover exactly parallel, but also the embodiments that are covered by the word “substantially” explained above.
  • “functionally parallel” relates to embodiments that in operation function as if the parts are for instance parallel. This covers embodiments for which it is clear to a skilled person that it operates within its intended field of use as if it were parallel.
  • the invention further applies to an apparatus or device comprising one or more of the characterising features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterising features described in the description and/or shown in the attached drawings.
  • FIG. 1 a first embodiment of a gas burner is illustrated in figures 1-3
  • FIG. 4-6 a second embodiment is illustrated in figures 4-6 .
  • Figures 1-3 schematically depict various view of an embodiment a current gas burner 1.
  • figure 1 schematically depicts a side view of a gas burner 1
  • figure 2 shows a perspective view of the gas burner 1 of figure 1
  • figure 3 shows a frontal view of the gas burner 1 of figures 1 and 2 .
  • the gas burner 1 or burner head 1 has a center line A, a front end or downstream end where a flame is formed when the gas burner is in operation, and an upstream end where gasses (fuel, air/oxygen, exhaust return gas) are introduced.
  • the gas burner 1 is usually mounted in a burner chamber or furnace room (not indicated).
  • Gas burner 1 in the depicted embodiment comprises various conduits for introducing gasses at well-defined regions of the gas burner 1. These conduits feed discharge openings that are positioned with respect to a gas burner center line A.
  • a primary fuel gas discharge opening 2 In the embodiment illustrated in figures 1-3 , there is provided a primary fuel gas discharge opening 2.
  • the primary fuel gas discharge opening 2 is here provided functionally coaxially with the gas burner center line A. It can also be described or interpreted as that the center line of the primary fuel gas discharge opening 2 functionally defines the gas burner center line A.
  • the primary gas discharge opening is fed by a primary fuel gas conduit 15.
  • the primary fuel gas conduit 15 In order to provide a flow of primary gas along the gas burner center line A, the primary fuel gas conduit 15 is provided substantially coaxially with respect to the gas burner center line A. This allows introduction of fuel gas into a primary flame region P for in operation fuelling a primary flame.
  • the embodiment illustrated in figures 1-3 further comprises a series of main fuel gas discharge openings 3.
  • These main fuel gas discharge openings 3 are provided for introducing fuel gas as main fuel at a main flame region M.
  • this main flame region M is downstream around said primary flame P for in operation fuelling a main flame.
  • the main fuel gas discharge openings 3 are fed by main fuel gas conduits 14.
  • each main fuel gas discharge openings 3 is fed by a main fuel gas conduits 14.
  • the main fuel gas conduits 14 run substantially parallel to the gas burner center line A. This provides a steady flow into the main flame region M.
  • the primary flame region and main flame region are indicated in figure 1A .
  • the amount of primary fuel gas and the amount of main fuel gas form respectively a first fraction and a second fraction.
  • the second fraction is larger that the first fraction.
  • the first fraction is 5-20% of the fuel gas and the second fraction makes 95-80% of the fuel gas.
  • the embodiment illustrated in figures 1-3 further comprises a series of exhaust gas discharge openings 4.
  • These exhaust gas discharge openings 4 are positioned in said gas burner 1 for introducing recirculated exhaust gas around said primary flame region P upstream of said primary flame.
  • the exhaust gas discharge openings 4 are provided for in operation introducing the exhaust gas into the main fuel before it ignites by said primary flame.
  • the exhaust gas is composed of recirculated exhaust gas. This was found to lower the NOx emission. This was possible for hydrocarbon fuel gas, but also and surprisingly for hydrogen fuel gas.
  • each discharge opening is fed by an exhaust gas return conduit 16.
  • the exhaust gas return conduits 16 run substantially parallel to the gas burner center line A.
  • the series of main fuel gas discharge openings 3 are arranged around the gas burner center line A.
  • the series of main fuel gas discharge openings 3 are arranged on a circle around the gas burner center line A.
  • a ring conduit around the gas burner center line A and provided with discharge openings may be provided.
  • the main fuel gas discharge openings 3 are evenly divided on the circle around the gas burner center line A. This in operation allows providing a cylinder of main fuel gas around the gas burner center line A. Furthermore, this is downstream of the primary flame.
  • the series of exhaust gas discharge openings 4 are arranged around the gas burner center line A.
  • these exhaust gas discharge openings 4 are here arranged on one circle around the gas burner center line A.
  • a circular ring with discharge openings may be provided.
  • the exhaust gas discharge openings 4 are provided near the main fuel gas discharge openings 3.
  • the exhaust gas discharge openings 4 are in particular provided to emit (recirculated) exhaust gas near the main fuel gas discharge openings 3.
  • the exhaust gas discharge openings 4 in particular are positioned to emit or inject exhaust gas downstream of a start of said primary flame P region for in operation introducing the exhaust gas into the main fuel before it ignites by said primary flame.
  • actual main fuel gas discharge openings 3 are grouped. Here, each time two main fuel gas discharge openings 3 are grouped together or are paired. Each group provides a main gas flow of jet when in operation. They may be provided around the centre line in other configurations, or on more circles, for instance.
  • the series of main fuel gas inlet discharge openings 3 emit their main fuel said main flame region M.
  • the embodiment of figures 1-3 further comprise a primary air discharge opening 9 for introducing primary air into said primary flame region P.
  • the primary air discharge opening 9 extends up to the primary flame region.
  • the primary fuel gas discharge opening 2 has its central axis concentric with said center line A.
  • the discharge openings are each fed by a conduit.
  • These conduits here run substantially parallel to the gas burner center line A.
  • the conduits described so far usually are rigid pipes, often made from steel. They have an open end that provide a discharge opening.
  • the depicted embodiment further comprises a sleeve 6 surrounding the series of main fuel gas discharge openings 3 and the series of exhaust gas discharge openings 4.
  • the sleeve 6 extends up to the main flame region M.
  • the sleeve 6 is provided in such a way that the sleeve 6 extends up to a predetermined distance into a furnace, measured from the place the gas burner enters the furnace. Usually this is measured from the wall where in enters the furnace.
  • the illustrated sleeve 6 at its downstream end continues in, or comprises, a tapering ring 11.
  • the tapering ring here extends up to the main flame region M. More in particular, the tapering ring 11 here has its upstream start at the primary flame region P.
  • the tapering ring 11 comprises a downstream end. At that downstream end, parts 13 of said tapering ring 11 are take out. In particular bites or indentions 13 are taken out of said downstream end of said tapering ring (11). In the embodiment, these indentations 13 are provided at, or are aligned with, each main fuel gas discharge opening 3.
  • the sleeve 6, the primary air discharge opening 9, and the primary fuel discharge opening 2 are functionally concentric.
  • the gas burner 1 comprises an end plate 5 at or near the primary fuel gas discharge opening 2.
  • the end plate 5 is provided at or near the upstream start of said tapering ring 11.
  • the end plate 5 is provided at or near an end of the primary fuel gas conduit 2.
  • the end plate 5 here comprises a central opening 8 on said center line A.
  • the primary fuel gas discharge opening 2 is provided upstream of the central opening or passage 8.
  • the end plate 5 comprises radial slits 12 starting at a distance from the central opening 8.
  • the radial slits 12 further extend radially up to a distance from an edge of end plate 5.
  • An air discharge opening 9 is provided just upstream of the end plate.
  • the air discharge opening 9 is here provided coaxially around the primary fuel discharge opening.
  • the end plate 5 and its radial slits are provided in such a manner that in operation the air from air discharge opening will flow through the radial slits. Downstream of the end plate 5, the air will start to mix with the primary fuel that flows out of the primary fuel discharge opening 2 and through the central opening 8 in the end plate 5.
  • a primary air conduit 17 is provided.
  • the primary air conduit 17 is here coaxial with the center line A.
  • the primary air conduit 17 is coaxial around the primary fuel gas conduit 15.
  • an end of primary air conduit 17 provides the primary air discharge opening 9. This primary air discharge opening is upstream just before the end plate central opening 8.
  • an end opening of said tapering ring 11 has a circumference that is larger than a circumference of the end plate 5.
  • the configuration of the end plate 5, primary fuel gas discharge opening 2, tapering ring 11 and sleeve 6 define the primary flame region P. Furthermore, the main fuel gas discharge openings 3, exhaust gas discharge openings 4, the sleeve 6 and its tapering end 11 allow delivery of the respective recirculated exhaust gas and main fuel gas in a cylinder around the primary flame region P end define the main flame region M.
  • main fuel gas conduits 3 comprise a bent end 7.
  • these bent ends 7 which bends in a tangential direction with reference to a circle having the center line A as its middle.
  • the main fuel gas conduits 3 are grouped into pairs or paired.
  • the pairs of main gas conduits 3 have an exhaust gas conduit 4 between then.
  • the bent ends 7 of the pairs of main fuel gas conduits 3 here bent in tangential direction towards each other.
  • the bent ends 7 of the pairs are bent towards the exhaust gas conduit 4. This provides a proper mixing of fuel gas and exhaust gas before ignition by the primary flame.
  • three pairs of main gas conduits are provided, and in larger type gas burners, four pairs are provided.
  • the main fuel gas discharge openings 3 are downstream of the end plate 5.
  • the main fuel discharge openings 3 are in axial direction in the tapered ring 11. Furthermore, the exhaust gas discharge openings are upstream of the tapered ring 11. In an embodiment, the exhaust gas discharge openings are upstream of the end plate 5.
  • the current gas burner is also very suitable for burning other gas, like for instance hydrogen.
  • Hydrogen usually tends to burn fierce and at high temperatures, causing NOx formation.
  • hydrogen tends to start burning at a much more broad range of mixtures of fuel and air than for instance methane or natural gas. Thus, it tends to start burning directly at the discharge openings.
  • the current gas burner is provided with optimizations for making it more suitable for burning hydrogen. For this reason, there is no flame indicated in figures 4-6 : the hydrogen starts burning directly at the discharge opening of fuel conduits.
  • One of the differences is in the constellation of the introduction of the primary fuel gas for the primary flame.
  • the end plate 5 is provided with end plate primary fuel gas openings 18.
  • a series of primary fuel gas discharge openings 2 are provided.
  • these primary fuel gas discharge openings 2 are provided around the center line A. In particular, they can be provided on an imaginary circle.
  • a circular ring can be provided, which circular ring van be provided with the discharge openings.
  • the primary fuel gas discharge openings 2 are provided by bent ends 18 of primary fuel gas conduits 15. These bent ends 18 are furthermore directed in a tangential direction with respect to a circle around the center line A. This allows proper mixing with primary air from the radial slits 12 and the central opening 8 of the end plate 5.
  • the end part of the main fuel gas conduits 14 is bent.
  • the main fuel gas conduits 14 have a bent part 7 that is designed to force a gaseous flow at an angle ⁇ away from the main fuel gas conduit's axial direction, of with respect to the center line A.
  • the bent part 7 is a tube end that is attached to the further main fuel gas conduit 14 at the angle ⁇ . In the depicted embodiment, it leaves an opening or slit at the start of the bent part 7 that allows a part of a fluid fuel flow to exit and leave the main fuel gas conduit 14 substantially in the axial direction A, or allows earlier mixing of some air.
  • the tube end 7 that is set at an angle extends 1-4 cm.
  • the angle is between 20° and 30°. In the embodiment shown, the angle is between 25° and 30°.
  • the resulting bent part 7 is at an angle of about 10° - 15°. In particular, the angle is about 12°-14°.
  • the end of the main fuel gas conduits 14 is bent, and tube end 7 is not present.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP22166388.3A 2022-04-01 2022-04-01 Gasbrenner mit niedriger nox-emission Withdrawn EP4253838A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22166388.3A EP4253838A1 (de) 2022-04-01 2022-04-01 Gasbrenner mit niedriger nox-emission
PCT/EP2023/058597 WO2023187215A1 (en) 2022-04-01 2023-04-01 Gas burner with low nox emission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22166388.3A EP4253838A1 (de) 2022-04-01 2022-04-01 Gasbrenner mit niedriger nox-emission

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EP4253838A1 true EP4253838A1 (de) 2023-10-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284438A (en) * 1992-01-07 1994-02-08 Koch Engineering Company, Inc. Multiple purpose burner process and apparatus
WO2001063176A1 (en) * 2000-02-24 2001-08-30 John Zink Company, L.L.C. LOW NOx EMISSIONS BURNER ASSEMBLY AND METHOD FOR REDUCING THE NOx CONTENT OF FURNACE FLUE GAS
WO2012091963A1 (en) * 2010-12-31 2012-07-05 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for melting a solid charge
US20140272736A1 (en) * 2013-03-15 2014-09-18 Fives North American Combustion, Inc. Low NOx Combustion Method and Apparatus
JP2018076979A (ja) 2016-11-07 2018-05-17 トヨタ自動車株式会社 水素ガス燃焼バーナー装置
CN111121023A (zh) 2020-01-10 2020-05-08 清华大学 一种燃料侧烟气再循环氮燃烧器及其燃烧方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284438A (en) * 1992-01-07 1994-02-08 Koch Engineering Company, Inc. Multiple purpose burner process and apparatus
WO2001063176A1 (en) * 2000-02-24 2001-08-30 John Zink Company, L.L.C. LOW NOx EMISSIONS BURNER ASSEMBLY AND METHOD FOR REDUCING THE NOx CONTENT OF FURNACE FLUE GAS
WO2012091963A1 (en) * 2010-12-31 2012-07-05 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for melting a solid charge
US20140272736A1 (en) * 2013-03-15 2014-09-18 Fives North American Combustion, Inc. Low NOx Combustion Method and Apparatus
JP2018076979A (ja) 2016-11-07 2018-05-17 トヨタ自動車株式会社 水素ガス燃焼バーナー装置
CN111121023A (zh) 2020-01-10 2020-05-08 清华大学 一种燃料侧烟气再循环氮燃烧器及其燃烧方法

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