EP3786524A1 - Brûleur régénératif pour émissions de nox très réduites - Google Patents

Brûleur régénératif pour émissions de nox très réduites Download PDF

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Publication number
EP3786524A1
EP3786524A1 EP20190654.2A EP20190654A EP3786524A1 EP 3786524 A1 EP3786524 A1 EP 3786524A1 EP 20190654 A EP20190654 A EP 20190654A EP 3786524 A1 EP3786524 A1 EP 3786524A1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
air
nozzle
fuel
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.)
Pending
Application number
EP20190654.2A
Other languages
German (de)
English (en)
Inventor
Werner Wiggen
Markus Mayrhofer
Michael Koller
Andreas Kraly
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.)
GAUTSCHI ENGINEERING GmbH
HPI HIGH PERFORMANCE INDUSTRIETECHNIK GmbH
Ebner Industrieofenbau GmbH
Original Assignee
Hpi High Performance Ind GmbH
Hpi High Performance Industrietechnik GmbH
Ebner Industrieofenbau GmbH
Gautschi Eng GmbH
Gautschi Engineering GmbH
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 Hpi High Performance Ind GmbH, Hpi High Performance Industrietechnik GmbH, Ebner Industrieofenbau GmbH, Gautschi Eng GmbH, Gautschi Engineering GmbH filed Critical Hpi High Performance Ind GmbH
Publication of EP3786524A1 publication Critical patent/EP3786524A1/fr
Pending 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
    • F23D14/24—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 at least one of the fluids being submitted to a swirling motion
    • 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 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • 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
    • 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
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20—Fuel flow guiding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/31019—Mixing tubes and burner heads

Definitions

  • the invention relates to a burner for burning fluid or aerosol fuels, in particular gaseous fuels, which can be used for heating, melting and keeping warm in processes with high temperature requirements, such as in melting furnaces. A corresponding procedure is also given.
  • gaseous fuels are natural gas (with a major component of methane), ethane, propane, butane, ethene, pentanes and hydrogen.
  • NOx nitrogen oxide
  • Regenerative burners in aluminum smelting furnaces are very susceptible to the development of thermal energy NOx. The reason for this is that the temperatures in the furnace can get very high and that the air is preheated to a very high temperature before combustion. This creates very high peak temperatures in the flame, which in turn can lead to high NOx emissions.
  • Oxygen burners reduce NOx emissions due to the lack of nitrogen. Here, however, the combustion must be carefully controlled. In the event that air comes into contact with the flame due to leaks in the furnace chamber or other phenomena, the NOx emissions rise sharply.
  • staged combustion can be carried out, but this can only reduce emissions up to a certain point or degree.
  • DE 41 42 401 A1 describes a method for operating a heating of a furnace based on one or more burners.
  • oxygen is used to reduce the formation of nitrogen oxides to burn the fuel.
  • the object of the present invention is to reduce the NOx emissions and at the same time to provide an efficient and inexpensive burner.
  • the invention provides a burner according to the invention for burning fluid or aerosol-like, in particular gaseous fuels, in particular according to claim 1.
  • a burner with a refractory burner body.
  • the burner body has a gas nozzle and several air nozzles which are at least partially formed in the burner body as integral formations and emerge on a front side of the burner body.
  • the air nozzles are arranged symmetrically around the gas nozzle and diverge at an angle ⁇ to the gas nozzle.
  • the refractory material in particular that of the burner, experiences less stress, which extends the life of the material and the device equipped with it.
  • the symmetrical arrangement of the air nozzles in particular their outlet opening (s) on the outlet or front side of the burner, means, among other things, that they are arranged concentrically around the gas nozzle and have at least one axis of symmetry. In the case of several axes of symmetry, each axis of symmetry can have the same angle to the neighboring axis of symmetry.
  • the air nozzles can have different distances from the gas nozzle.
  • the air nozzles are preferably located on one or more, in particular concentric, circles around the gas nozzle and are evenly distributed on this or these, ie arranged on the respective circle at the same distance from one another.
  • the air nozzles are oriented on an outer circle at an angle ⁇ and the air nozzles on the inner circle or circles are oriented at an angle ⁇ , the angle ⁇ being smaller than the angle ⁇ ; alternatively the angle of the air nozzles of a circle becomes linear or exponentially smaller with each circle closer to the gas nozzle.
  • the axes of symmetry can relate not only to the arrangement of the air nozzles, but also to their design, in particular their outlet opening (s). Their shape and / or size or exit surface are to be understood here, which are point-symmetrical and / or axially symmetrical.
  • air as a gas mixture also facilitates the production and use of a corresponding system, in particular a furnace, with one or more burners according to the invention.
  • the ambient air is sucked in and then preferably (gas and / or dust) filtered, dried, pre-cooled and / or warmed before it is fed into the air nozzles of the burner.
  • the gas nozzle is preferably supplied with gaseous fuel, but can also be operated with other fluid or aerosol fuels.
  • aerosols i.e. solid particles or liquid particles in a gas
  • these particles form the fuel.
  • the burner in particular the gas outlet nozzle, can have an atomizer in order to distribute and mix the particles in the gas.
  • the angle ⁇ between the gas nozzle and one or more air nozzles, in particular one or more main combustion air nozzles is in the range from 1 to 45 degrees.
  • the angle ⁇ is preferably 4 degrees.
  • the smaller the angle ⁇ the better the expelled air can entrain the gas.
  • the larger the angle ⁇ the better the distribution of the expelled air in front of the burner or in the furnace.
  • the air enters the combustion chamber through the air nozzle. Since the air nozzles are arranged diverging from one another at the same time, the air initially flows away from the gas jet. Due to the increasing mixing with exhaust gas, however, the gas jet and the air jets spread, so that after a certain time the gas jet and the air jets meet.
  • the angle between the two air nozzles is consequently smaller than the angle at which the jets spread out from the outlet opening (also referred to as the radiation or outlet angle).
  • the exit angle is preferably 18 ° and describes the directivity of the nozzle. Under the directional effect of a nozzle is in particular to understand the angle of the velocity vectors of the gas particles; the more parts of the outflowing gas have a speed running parallel to the axis of a nozzle, the smaller the angle of the outflowing gas and the more thrust-effective and far-reaching is the emerging gas.
  • the burner body can have two to eight, preferably four, air nozzles.
  • the symmetrical and simultaneously directed air distribution increases with the number of air nozzles. While a small number of air nozzles enables better mixing of the air with the exhaust gases and thus reduces the combustion of the gas, the combustion temperature and the NOx emissions, a larger number of air nozzles has better symmetrical distribution properties.
  • Four air nozzles create an optimal configuration between NOx emissions and symmetrical distribution of the expelled air.
  • Another advantageous design option is to adapt the size of the outlet openings of the air nozzles.
  • the air nozzles should have outlet openings with a total area that is at most half a circular area of the front of the burner body.
  • the air nozzles can also have outlet openings, the width of which increases radially starting from the gas nozzle.
  • the outlet openings can form trapezoidal outlet surfaces on the front of the burner.
  • the gas nozzle has a pre-combustion chamber which is formed in the burner body.
  • each or at least one air nozzle has a pre-combustion air nozzle which connects the air nozzle to the pre-combustion chamber.
  • the gas nozzle preferably has a swirl nozzle for swirling the fuel, which is inserted in the burner body. This has the advantage of promoting a mixing of the fuel with the air in and / or after the swirl nozzle and thus a spatially distributed combustion of the gas.
  • the burner body is preferably formed by a first burner block with the front side, a second burner block which is arranged coaxially to the first burner block, and a third burner block, in particular with a burner mouth, as the outer casing of the first and second fuel blocks.
  • the split burner head or body is justified in terms of production technology, as it can be cast better this way.
  • the burner stones are preferably each cast in a separate steel jacket. The division of the burner body into a first and a second burner block enables the gas outlet nozzle and the swirl nozzle to be inserted more easily.
  • the burner mouth is funnel-shaped and can have an angle to the longitudinal or gas flame axis in the range of 15 to 75 degrees.
  • this angle is always greater than the angle o so that the combustible gas and the air do not immediately compress and mix with one another when they exit the burner.
  • the burner mouth can be provided by the internal geometry of the furnace instead of on the third burner block, which is why the third burner block can be omitted from the burner body in other embodiments.
  • the burner stones are preferably cylindrical, but can also be cuboid or elliptical.
  • a rectangular front side attention is also paid to a symmetrical arrangement of the air nozzles around the gas nozzle, the arrangement also being symmetrical to the rectangular front side of the burner, in particular the first and third burner blocks.
  • the air nozzles in particular their outlet opening (s), can have an outwardly tapering mouth or frame in order to accelerate the air and thus improve the directivity of the expelled air.
  • the same feature with regard to the taper can, additionally or alternatively, in the case of the gas nozzle, in particular its outlet opening (s).
  • said outlet openings can be shaped in such a way as to expel the air and / or the gas in a specific direction and thus to form the said angle ⁇ .
  • the gas nozzle and / or the air nozzles can be partially or completely formed integrally in the burner body by casting and / or mechanical finishing.
  • components can be used in the burner body which at least partially form the nozzles and their paths or channels. These components can serve as a connecting piece between multi-part burner stones, influence the direction and / or speed of the gas or air and / or seal the corresponding nozzle from external gases, as can e.g. be the case with the swirl nozzle.
  • Pressed refractory wool or paper is preferably used as filling and / or sealing material in and / or around the burner, in particular between the burner stones.
  • the air exits preferably at a speed of 80 to 200 m per second.
  • the gas exits preferably at a speed of 30 to 100 meters per second.
  • a partial volume of the Gas mixture provided to the fuel in such a way that a certain percentage of the fuel pre-burns.
  • This pre-combustion results in a staged combustion of the gas, a stronger temperature distribution and the elimination or at least a reduction of temperature peaks during the combustion.
  • gaseous fuel is swirled and / or rotated before it is ejected. This allows better mixing with the gas mixture and thus better spatially distributed combustion, instead of punctual combustion areas.
  • the gas mixture is advantageously ejected in such a way that the at least two directions are equally spaced from one another or have the same angle around the gas flame.
  • the exit directions form imaginary intersections / points on a plane perpendicular to the gas flame or its longitudinal axis, which lie on a circle concentric around the flame and are evenly distributed on this circle.
  • the burner 15 which has a burner body which is formed by a first burner block 1, a second burner block 2 and a third burner block 3. All three burner stones 1, 2, 3 are individual parts of the burner body and lie to each other.
  • the first and second burner blocks 1, 2 are cylindrical and the third burner block 3 is hollow-cylindrical, the first and second burner blocks 1, 2 being arranged in the third burner block 3.
  • the arrangement can be precisely fitting or, if there are inaccuracies in the dimensions, it can be made or supported by means of insulating wool and / or refractory paper / wool between the burner stones.
  • these tongue and groove devices, rails and / or attachments or elevations and depressions can have and thereby enable a specific or predetermined composition of the burner blocks.
  • the burner 15 shown is equipped with a gas nozzle and four air nozzles.
  • the gas nozzle preferably has the following components, which are arranged one after the other and coaxially or along a longitudinal axis 14 to one another: a hollow cylindrical outlet nozzle 11 made of metal, which is supplied with gas via a feed line 12; a swirl nozzle 9 for swirling the gas, which is inserted in the second burner block 2; a tubular mixing path 10 through which the fluidized gas is passed; a pre-combustion chamber 7 in which the mixing path 10 and four pre-combustion air nozzles or channels 5 of the air nozzles open.
  • the swirled gas is mixed with the air from the pre-combustion air nozzles 5 and preferably ignited initially.
  • the mixing path 10 and the pre-combustion chamber 7 are integrally formed in the first burner block 1.
  • the swirl nozzle 9 is located at the transition from the second burner block 2 to the first burner block 1.
  • the swirl nozzle 9 can be designed in such a way that no gases from the boundary / layer between the first and second burner blocks 1, 2 can enter the gas nozzle; ie the outside of the swirl nozzle 9 preferably seals the gas nozzle against unwanted gases or against gas leaks.
  • the outlet nozzle 11 is arranged in a cavity in the second burner block 2, the gas feed line 12 being arranged in a cooling line 13 which preferably supplies cooled air to cool the feed line 12 and the outlet nozzle 11.
  • a cooling line 13 which preferably supplies cooled air to cool the feed line 12 and the outlet nozzle 11.
  • Each air nozzle preferably has the following components: an air duct 4 which is formed in the second burner block 2 is; a main combustion air nozzle or duct 6 formed in the first burner block 1 and connected to the air duct 4; and a pre-combustion air nozzle or duct 5, which is also formed in the first burner block 1 and branches off from the main burner air nozzle 6 into the pre-combustion chamber 7.
  • the feed line 12 and the swirl nozzle 9 all other, in particular previously mentioned, components of the burner 15 are thus formed in the burner blocks 1, 2, 3 by means of cavities.
  • the angle ⁇ between the longitudinal axis 14 (or also the gas nozzle) and an air nozzle is shown, which characterizes the air flow diverging towards an exiting gas or a gas flame.
  • the air duct 4 and the main combustion nozzle 6 are identical to one another and form a duct of constant shape, thickness and width from the rear of the burner 15 to the front 16 of the burner 15.
  • the angle ⁇ is formed in particular between the longitudinal axis 14 and the inside or edge of the air duct 4 or the main combustion nozzle 6.
  • the channel 4 and the nozzle 6 can differ;
  • other components such as the outlet opening of the air nozzle, in particular the main combustion air nozzle 6 on the front, can be designed in such a way that the air is expelled at an angle ⁇ to the longitudinal axis 14.
  • the burner body or at least one or all of the burner blocks 1, 2, 3 is preferably refractory.
  • the first burner block 1 has a circular front face / surface 16 and the third burner block 3 has a funnel-shaped, widened burner mouth 8.
  • these components 16, 8 and the pre-combustion chamber 7 are designed to be at least fireproof; Or, alternatively, the components that are facing the combustion or gas flame and / or are exposed to heat / radiation.
  • the four main combustion air nozzles 6 and the pre-combustion chamber 7 exit at the front 16. In this case, these components form openings or exit surfaces which are arranged symmetrically about the longitudinal axis 14.
  • the burner 15 is off Figure 1 shown in a top view.
  • the circular front side / surface 16 of the first burner block 1 and the annular burner mouth 8 of the third burner block 3 are shown.
  • the partial blind hole of the pre-combustion chamber 7 with the adjoining mixing path 10 and the swirl nozzle 9 is formed.
  • the pre-combustion chamber 7 is a partial blind hole, since it does not close completely apart from an annular bottom.
  • the four openings to the pre-combustion air nozzles 5 are each arranged at a 90 degree angle around the center point or the longitudinal axis to one another.
  • the four openings of the main combustion air nozzles 6 are aligned radially from the longitudinal axis of the burner 15, in particular in a cross shape and identical to the four pre-combustion air nozzles 5. It should be noted that the area of an outlet opening of the main combustion air nozzle 6 is the same size and / or shaped as the cross section of the main combustion air nozzle 6 within the first burner block 1. In other embodiments, the outlet openings and their connected channels, such as the main combustion air nozzles 6, the pre-combustion air nozzle 5 and the air channels 4, can differ in their shape and / or size.
  • the openings shown each form a trapezoidal surface which tapers towards the longitudinal axis or widens towards the outer circumference of the burner 15. Other shapes instead of the trapezoidal shape are possible in other embodiments.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP20190654.2A 2019-08-27 2020-08-12 Brûleur régénératif pour émissions de nox très réduites Pending EP3786524A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019122940.5A DE102019122940A1 (de) 2019-08-27 2019-08-27 Regenerativbrenner für stark reduzierte NOx Emissionen

Publications (1)

Publication Number Publication Date
EP3786524A1 true EP3786524A1 (fr) 2021-03-03

Family

ID=72050704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20190654.2A Pending EP3786524A1 (fr) 2019-08-27 2020-08-12 Brûleur régénératif pour émissions de nox très réduites

Country Status (4)

Country Link
US (1) US20210063013A1 (fr)
EP (1) EP3786524A1 (fr)
CN (1) CN112443843B (fr)
DE (1) DE102019122940A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418062A (en) * 1966-08-08 1968-12-24 Bloom Eng Co Inc Burner structures
DE4142401A1 (de) 1991-12-20 1993-06-24 Linde Ag Verfahren zum betrieb einer auf einem oder mehreren brennern basierenden beheizung eines ofens
US7163392B2 (en) * 2003-09-05 2007-01-16 Feese James J Three stage low NOx burner and method
US7175423B1 (en) * 2000-10-26 2007-02-13 Bloom Engineering Company, Inc. Air staged low-NOx burner

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US2187674A (en) * 1936-11-14 1940-01-16 Dorothy Bennett Gas burner
US3101773A (en) * 1960-03-22 1963-08-27 Selas Corp Of America Air preheating burner
RO60886A2 (fr) * 1974-03-21 1976-10-15
US4969814A (en) * 1989-05-08 1990-11-13 Union Carbide Corporation Multiple oxidant jet combustion method and apparatus
JPH08226618A (ja) * 1995-02-21 1996-09-03 Tokyo Gas Co Ltd リジェネレイティブバ−ナの蓄熱室装置
JPH10148309A (ja) * 1996-11-20 1998-06-02 Osaka Gas Co Ltd 低ＮＯｘバーナ
DE60025924D1 (de) * 1999-08-17 2006-04-20 Nippon Furnace Kogyo K K Verbrennungsverfahren und brenner
JP3874583B2 (ja) * 1999-12-27 2007-01-31 大阪瓦斯株式会社 燃焼装置
AU776725B2 (en) * 2000-08-04 2004-09-16 Mitsubishi Hitachi Power Systems, Ltd. Solid fuel burner and combustion method using solid fuel burner
JP5202594B2 (ja) * 2010-09-09 2013-06-05 中外炉工業株式会社 蓄熱式燃焼装置及び加熱炉
JP4892107B1 (ja) * 2011-03-23 2012-03-07 新日鉄エンジニアリング株式会社 炉頂燃焼式熱風炉
CN102230623B (zh) * 2011-07-12 2013-04-17 重庆赛迪工业炉有限公司 扁平燃烧装置
FR2984995A1 (fr) * 2011-12-21 2013-06-28 Air Liquide Dispositif et procede de pulverisation de liquide combustible
CN103206711B (zh) * 2013-03-20 2015-09-16 洛阳腾节炉业科技有限公司 一种蓄热式双蜗平焰烧嘴
US20150133709A1 (en) * 2013-11-08 2015-05-14 Uop Llc LOW NOx BURNER FOR ETHYLENE CRACKING FURNACES AND OTHER HEATING APPLICATIONS
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CN206269128U (zh) * 2016-11-04 2017-06-20 北京航天石化技术装备工程有限公司 一种底部低氮氧化物燃气燃烧器
CN209655299U (zh) * 2019-02-25 2019-11-19 北京泷涛环境科技有限公司 一种超低氮气体燃烧器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3418062A (en) * 1966-08-08 1968-12-24 Bloom Eng Co Inc Burner structures
DE4142401A1 (de) 1991-12-20 1993-06-24 Linde Ag Verfahren zum betrieb einer auf einem oder mehreren brennern basierenden beheizung eines ofens
US7175423B1 (en) * 2000-10-26 2007-02-13 Bloom Engineering Company, Inc. Air staged low-NOx burner
US7163392B2 (en) * 2003-09-05 2007-01-16 Feese James J Three stage low NOx burner and method

Also Published As

Publication number Publication date
CN112443843A (zh) 2021-03-05
CN112443843B (zh) 2024-03-22
US20210063013A1 (en) 2021-03-04
DE102019122940A1 (de) 2021-03-04

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