CN105247285A - Method for the combustion of a low nox premix gas burner - Google Patents

Method for the combustion of a low nox premix gas burner Download PDF

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Publication number
CN105247285A
CN105247285A CN201480028810.6A CN201480028810A CN105247285A CN 105247285 A CN105247285 A CN 105247285A CN 201480028810 A CN201480028810 A CN 201480028810A CN 105247285 A CN105247285 A CN 105247285A
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CN
China
Prior art keywords
burner
nozzles
nozzle
injector nozzles
flame
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Granted
Application number
CN201480028810.6A
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Chinese (zh)
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CN105247285B (en
Inventor
路易斯·里奇
福阿德·赛义德
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Fives Pillard SA
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Fives Pillard SA
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • F23D14/085Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head with injector axis inclined to the burner head axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/48Nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/48Nozzles
    • F23D14/58Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D23/00Assemblies of two or more burners
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23MCASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00Casings; Linings; Walls
    • F23M5/02Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F23M5/025Casings; Linings; Walls characterised by the shape of the bricks or blocks used specially adapted for burner openings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00008Burner assemblies with diffusion and premix modes, i.e. dual mode burners

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The method of the invention comprises a premix burner formed by a group of premix nozzles (2) disposed in a circle of diameter DB around a central nozzle (4) disposed on a central axis A of the burner (1) and intended to create a radial flame (5), characterised in that the oxidizer-to-fuel ratio (R) of the group of nozzles (2, 4) is between 1.3 and 1.75. The radial flame (5) is used for the cross-lighting of the different premix nozzles (2, 4). An annular flame is also provided by premixed combustion in order to keep the ratio (R) favourable to the low production of thermal nitrogen oxides at the intersection of the radial flame and the flames from the nozzles.

Description

For the method for the burning of low NOx premix gas burner
Technical field
The present invention relates to industrial gasses burner.These combustor exit nitrogen oxide (NOx), this is pollution sources.
Therefore, reducing the nitrogen oxide being derived from burning is the significant consideration in industrial burner development process.The burning of combustion gas (natural gas or other gas) produces nitrogen oxide by the skyborne high-temperature oxydation of nitrogen.These nitrogen oxide are commonly referred to hot NOx.
The speed that nitrogen oxide is formed is followed arrhenius law and depends on to heavens: local oxygen content,
Local nitrogen content,
Local temperature (being significantly greater than 1500 DEG C).
At present, industrial gasses burner is diffusion flame burners substantially, this means in the burner, and the mixing of oxidant and fuel all occurs in combustion chamber.Utilize these diffusion flame burners, the most widely used technology for reducing hot NOx is usually based on the localized variation of oxygen and fuel content, and this localized variation is by using air event to provide content or realizing by using fuel stage to provide.
When utilizing the flame combustion of oxidant and fuel premixed, the temperature of flame kernel is more evenly many and strongly depend on oxidant/fuel ratio.Therefore, as direct result, the discharge of nitrogen oxide is similarly extremely sensitive to this ratio.
Form the method for theme of the present invention and burner and relate to low NOx gas burner based on premix technology.Experience display nitrogen oxide can be greater than 10 times according to the change of oxidant/fuel ratio.Such as, when oxidant is surrounding air, fuel gas is that rich gas (richgas) (has low heat value, 6kWh/Nm 3), the amount of required oxidant of burning completely of gas and the low yield of nitrogen oxide are between stoichiometric 140% and 170% of oxidant.Since it is so, the discharge being derived from the nitrogen oxide of premixed combustion becomes very low compared with the discharge obtained by diffusion flame.
But, excessive oxidant is the obstruction that this premix technology uses in the method for such as boiler, industrial furnace etc., when in above method, when at high temperature, (>=100 °) discharge flue gas, the 100% stoichiometric significantly excessive oxidant that exceeds that burning needs produces extra thermal losses.
The burner forming theme of the present invention uses premix technology in order to the performance of its low NOx, and uses the extra means in order to reduce the Overall excess air at burner place when not increasing hot NOx emission.
In this burner, test confirms, and very low in order to guarantee the temperature hot NOx that is enough high and that produce burnt simultaneously, the oxidant/fuel ratio in premix or more particularly ratio (R) are extremely important.
LCV is low heat value, does not namely consider the caloric value that energy condenses.
CP is the thermal capacity in kJ/kg.
Flow velocity is in Kg/h.
Combustion method according to the present invention comprises premix burner, this premix burner is made up of one group of premixing nozzle, these premixing nozzles central nozzle be centered around on the central axis of burner is arranged in the circle of diameter DB, wherein this central nozzle is intended to generate radial flame, wherein, this group nozzle has the oxidant/fuel ratio (R) between 1.3 and 1.75.
Burner is made up of the nozzle of two types.The circle that one group of premixing nozzle is arranged in diameter DB is mainly intended to generate axial flame.These peripheral injector nozzles are placed around central nozzle, and the central axis that this central nozzle is arranged in burner is intended to generate radial flame.
Be intended to guarantee to be called the mutual igniting (inter-ignition) between " periphery " each premixing nozzle by the radial flame of central nozzle.This radial flame is generated by the premixed combustion of the ratio (R) had at this nozzle between 1.3 and 1.75 equally.
According to a special characteristic, central nozzle is premixing nozzle, which ensure that the better distribution of ratio (R).
According to another feature, radial flame is the premixed flame of the overall flow rate of the fuel of being discharged by nozzle of 3% to 20%.
According to a specific arrangements, central nozzle and peripheral injector nozzles are all premixing nozzles, and have the oxidant/fuel ratio (R) between 1.3 and 1.75 separately.Each nozzle all has optimal ratio (R), and the amount of the NOx discharged by each nozzle is low, and the intersecting area between the flame of each nozzle discharges few NOx equally.
Arrange according to another, central nozzle is dismountable.Central nozzle is dismountable and can be easily replaced by liquid fuel ejecting gun, thus imparting burner becomes the selection of the burner of mist and liquid.
According to special characteristic, premixing nozzle has deflecting element, and this deflecting element gives pre-composition relative to the angle of outlet between central axis A one-tenth-45 ° and+45 °.Premixing nozzle has outlet that is axial or that tilt relative to the axis of burner and the angle of outlet of nozzle changes between-45 ° and+45 °, with the multiple geometry making the shape adaptation of flame become to be applicable to combustion chamber, and the length of flame/natural scale change is greater than 4 times.
According to specific arrangements, gas ejector is placed on the outer peripheral edge of burner around peripheral injector nozzles with diameter DL.In order to reduce the excess air/oxidant at burner place when not increasing discharged nitrous oxides, the combustion gas of certain ratio needs to be injected into premixing nozzle outside.The extra injection of combustion gas uses the injector being arranged in one, between often pair of nozzle or every two or three nozzles to carry out.
According to a special characteristic, gas ejector is placed on the outer peripheral edge of burner around peripheral injector nozzles with diameter DL, and injector sprays total burner oil of 20% to 50%.
According to another feature, injector has and becomes the angle of outlet between 0 ° and 40 ° relative to the angle of outlet of peripheral injector nozzles.Provide with the additional gas that the diameter DL of the outer dia DB close to nozzle sprays or account for 10%, and to become 0 ° of angle to 40 ° and preferably between 10 ° and 30 ° to spray relative to the axis of premixing nozzle.This makes it possible to by exceedingly rapid mixing and do not increase ratio (R) partly between these extra injection combustion gas and the pre-composition sent from nozzle.Combustion gas is sprayed by this way, and the flue gas first circulated with the outer peripheral edge place at flame is mixed.The advantage of this configuration is the opening making more easily to be adjusted to applicable combustion chamber and/or boiler, especially existing combustion chamber or boiler class.
According to a special characteristic, diameter DL has the size be less than or equal in the following value of mm: [P (MW) × 20] 450.P is in the power of megawatt.This size makes it possible to the size of optimizing combustor and the size of the therefore opening of Optimizing Combustion room and/or boiler.
Arrange according to another, injector is equipped with venturi system.Gas utilizes venturi system to spray, and this venturi system is accelerated at the flue gas at the outer peripheral edge place of gas flame and the premix of extra injection combustion gas.
According to another feature, diameter DL is between 1.2 times and 1.6 times of the diameter DB of peripheral injector nozzles.Injector sprays combustion gas with the diameter being greater than the diameter DB of nozzle.The combustion gas of extra injection is introduced through the straight injector of the wall of combustion chamber and/or boiler, or introduces by rotating the bend pipe injector introduced from combustion chamber exterior mechanical when the straight rifle of combustion chamber through this wall.
According to another feature, injector has and becomes the angle of outlet between-20 ° and+20 ° relative to the axis of burner.
According to alternative scheme, nozzle has the flameholder of 0.1 to 0.4 times of the cross section being presented as described nozzle.Because the stability of premixed flame is responsive to local velocity gradient, so must use " maintenance " and the reliable device stabilized the flame.This high-performance flame also needing application to be inserted in the stabilizer in the exit of each nozzle keeps and stabilising arrangement, make the stability of premixed flame extending larger ratio (R), and increase the change of burner flow rate when the risk not having flame to return on premixing nozzle inside.In order to the change of burner charging is greater than 6, and drop to 300DaPa in order to the total pressure of burner, the surface area of flameholder needs between 0.1 and 0.4 relative to the surface area of nozzle.Stabilizer can be used in the central authorities of nozzle or be used in the outside of nozzle.
According to a special characteristic, the angle of outlet of flameholder determination pre-composition.The angle of outlet of pre-composition is given by deflecting element, and this deflecting element can or can not be associated with flameholder.
Arrange according to another, peripheral injector nozzles has flameholder, and this flameholder comprises the radial component of the centre being arranged in each peripheral injector nozzles.In order to remain on the flame on the top of each premixing nozzle better, stabilizer comprises radial steady component, and this part guarantees that radial central flame spreads better towards the central authorities of each peripheral injector nozzles.In order to large-scale premixing nozzle muzzle velocity and therefore in order to large-scale burner rating changes, guarantee that rapid-ignition leaves the pre-composition of peripheral injector nozzles at stabilizer place.
The invention still further relates to the burner used by the method.
Provide the example also illustrated with reference to accompanying drawing by way of example below reading after, those skilled in the art it will also be appreciated that other advantages.
-Fig. 1 is the cross section of the burner running through prior art, shows and is provided with peripheral injector nozzles,
-Fig. 2 illustrate the burner of Fig. 1 towards upper view,
-Fig. 3 illustrates the cross section according to burner of the present invention, shows the layout of central nozzle and the diffusion of radial flame,
-Fig. 4 be the burner of Fig. 2 towards upper view,
-Fig. 5 is the detail view with the nozzle of stabilizer according to the first embodiment,
-Fig. 6 is the detail view of the second embodiment according to nozzle of the present invention,
-Fig. 7 is the detail view of the 3rd embodiment according to nozzle of the present invention with stabilizer and deflecting element,
-Fig. 8 is the detail view of the nozzle according to the 4th embodiment,
-Fig. 9 is the detail view of the peripheral injector nozzles with central nozzle,
-Figure 10 is the viewgraph of cross-section of the burner according to the second embodiment with extra fuel gas injection,
-Figure 11 be the burner of Figure 10 towards upper view,
-Figure 12 illustrates the detail view of injector from the side,
-Figure 13 be the injector of Figure 12 towards upper view,
-Figure 14 is the viewgraph of cross-section of the burner according to the 3rd embodiment,
-Figure 15 is the viewgraph of cross-section of the 4th embodiment according to burner of the present invention.
The burner 1 of prior art shown in Figure 1, comprises around the rounded premixing nozzle 2 of the axis A of burner 1.Each nozzle 2 is preferably columniform, and nearly all oxidant (usual air) is introduced.Fuel itself is injected in these nozzles 2 via a series of main ejector, and the quantity of main ejector according to burner rating and available gas pressure, can change from 1 to 16 ground.
Each main ejector 3 is used in radial distribution on main ejector 3 and combustion gas is spread in a series of holes (do not describe) to 45 ° in 90 ° relative to the axis of nozzle 2.The position of main ejector 3 in nozzle 2 and the stepped arrangement in hole limit in the following manner, even if obtain gas to be spread as far as possible equably by the whole surface area of nozzle 2, avoid jet crossing region, and therefore avoid the region of air accumulation, and avoid the region not having gas in premix.
Burner 1 according to the present invention describes in figs. 3 and 4, and this burner comprises peripheral injector nozzles 2 and central nozzle 4.Premixing nozzle 2 is preferably rounded around the central nozzle 4 generating radial flame 5.This radial flame 5 has the task of the mutual igniting guaranteed between each premixing nozzle 2.Radial flame, equally by utilizing the burning of premix to generate, makes this ratio (R) remain to be conducive to lacking of the hot NOx generation in intersection between radial flame 5 and the axial flame sent from nozzle 2.
Central nozzle 4 is removable, and can be replaced by another types of nozzles of giving burner 1 mixed function to a certain degree.
The various interchangeable form of the nozzle 2 shown in Fig. 5 to Fig. 8 comprises stabilizer 6, and this stabilizer is arranged as:
-in Figure 5 in the centre of nozzle 2,
On the both sides of-nozzle 2 in figure 6,
-in centre there is fin 60 in the figure 7,
-in fig. 8, stabilizer 6 is placed on the top end of circular pipe 61.
Fig. 9 illustrates that the form of stabilizer has radial component 62, allows stabilizer 6 to be arranged in the centre of nozzle 2 simultaneously.This radial component 62 guarantees that radial central flame 5 spreads towards the central authorities of each peripheral injector nozzles 2 better.
Figure 10 and Figure 11 illustrates the second embodiment of burner 1, wherein injector 7 with diameter DL in the diameter DB disposed outside of nozzle 2 at the outer peripheral edge place of burner 1.Injector 7 is placed between two nozzles 2 (see Figure 11) or every two nozzles.This position allows the mist from nozzle 2 to mix with the gas from injector 7 is easier.
In one embodiment, injector 7 leads to Venturi tube 70 (see Figure 12 and Figure 13), and the gas making it possible to accelerate to send from injector 7 mixes with the low oxygen content burning gases circulated in the flame outer peripheral edge of burner.This layout allows the smoulder of the extra gas sprayed by injector 7, and limits the formation of the NOx relevant to this burning.This Venturi tube 71 has semicircular in shape, makes it around the top 71 of injector 7.
Burner 1 shown in Figure 14 is arranged on wall 8, and has the injector 7 of the diameter DB outside being placed on nozzle 2.Injector 7 is straight and passes wall 8.When it can not pass wall 8, injector 7 is advanced along burner 1, then continues into bent tube section 73 through wall 8, thus allows gas to go out to spray in the distance selected.Injector 7 is with the angle gas jet between-20 ° and+20 °, and this jet angle produces in known manner, such as, use the inclination mouth of pipe (description).

Claims (12)

1. one kind comprises the combustion method of premix burner (1), described premix burner is made up of the peripheral injector nozzles (2) of one group of premix, this group of peripheral injector nozzles is arranged in the circle of diameter DB around the central nozzle (4) on the central axis being arranged in described burner (1), and described central nozzle is intended to generate radial flame (5), it is characterized in that, the group of described peripheral injector nozzles and described central nozzle (2,4) has the oxidant/fuel ratio (R) between 1.3 and 1.75.
2. the method according to aforementioned claim, is characterized in that, described radial flame (5) is the premixed flame of 3% to 20% of the total flow rate representing the fuel of being discharged by described peripheral injector nozzles and described central nozzle (2,4).
3. according to method in any one of the preceding claims wherein, it is characterized in that, described central nozzle (4) and described peripheral injector nozzles (2) are all premixing nozzles, and have the oxidant/fuel ratio (R) between 1.3 and 1.75 separately.
4. according to method in any one of the preceding claims wherein, it is characterized in that, the described peripheral injector nozzles (2) of premix has deflecting element (60,61), and described deflecting element gives pre-composition relative to the angle of outlet between described central axis A one-tenth-45 ° and+45 °.
5. according to method in any one of the preceding claims wherein, it is characterized in that, gas ejector (7) is placed on the outer peripheral edge of described burner (1) around described peripheral injector nozzles (2) with diameter DL, and described injector (7) sprays total burner oil of 20% to 50%.
6. according to the method described in aforementioned claim, it is characterized in that, relative to the angle of outlet of described peripheral injector nozzles (2), described injector (7) has the angle of outlet between 0 ° and 40 °.
7. the method according to any one of claim 5 and 6, is characterized in that, what diameter DL had is less than or equal to following value in the size of mm: [P × 20]+450, wherein P measures with MW.
8. the method according to any one of claim 5 to 7, is characterized in that, diameter DL is between 1.2 times and 1.6 times of the diameter DB of described peripheral injector nozzles (2).
9. the method according to any one of claim 5 to 8, is characterized in that, described injector (7) has the angle of outlet between-20 ° and+20 ° of the central axis A relative to described burner.
10. according to method in any one of the preceding claims wherein, it is characterized in that, the flameholder (6) that described peripheral injector nozzles (2) has occupies 0.1 times of the cross section of described peripheral injector nozzles (2) to 0.4 times.
11. according to the method described in aforementioned claim, it is characterized in that, the flameholder (6) that described peripheral injector nozzles (2) has comprises the radial component (62) of the centre being arranged in each described peripheral injector nozzles (2).
The premix burner (1) of 12. 1 kinds of methods according to any one of claim 4,6,7,8,9,10 and 11.
CN201480028810.6A 2013-04-05 2014-02-25 Method for the combustion of a low nox premix gas burner Active CN105247285B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1353079 2013-04-05
FR1353079A FR3004239B1 (en) 2013-04-05 2013-04-05 LOW NOX PRE-MIXED GAS BURNER
PCT/FR2014/050390 WO2014162074A1 (en) 2013-04-05 2014-02-25 Method for the combustion of a low nox premix gas burner

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CN105247285A true CN105247285A (en) 2016-01-13
CN105247285B CN105247285B (en) 2017-04-26

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CN201480028810.6A Active CN105247285B (en) 2013-04-05 2014-02-25 Method for the combustion of a low nox premix gas burner

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EP (1) EP2981761B1 (en)
KR (1) KR101878346B1 (en)
CN (1) CN105247285B (en)
ES (1) ES2813361T3 (en)
FR (1) FR3004239B1 (en)
PL (1) PL2981761T3 (en)
WO (1) WO2014162074A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN108204598A (en) * 2016-12-16 2018-06-26 中国石油化工股份有限公司 Mix flare burner
CN112969890A (en) * 2018-10-05 2021-06-15 法孚皮拉德公司 Burner and combustion method for a burner

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105066126B (en) * 2015-08-17 2018-07-10 罗诺克兹(北京)能源设备技术有限公司 Pre-mixing type combustion apapratus

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CN102482997A (en) * 2009-09-07 2012-05-30 阿尔斯通技术有限公司 Method for switching over a gas turbine burner operation from liquid to gas fuel and vice-versa

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US2935128A (en) * 1957-06-06 1960-05-03 Nat Airoil Burner Company Inc High pressure gas burners
WO1993012388A1 (en) * 1991-12-16 1993-06-24 United Technologies Corporation LOW NOx COMBUSTION
US5238395A (en) * 1992-03-27 1993-08-24 John Zink Company Low nox gas burner apparatus and methods
CN101061305A (en) * 2004-11-18 2007-10-24 丰田自动车株式会社 Control device for internal combustion engine and air-fuel ratio calculation method
CN101675229A (en) * 2007-05-01 2010-03-17 丰田自动车株式会社 Control device for internal combustion engine
CN102482997A (en) * 2009-09-07 2012-05-30 阿尔斯通技术有限公司 Method for switching over a gas turbine burner operation from liquid to gas fuel and vice-versa

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Publication number Priority date Publication date Assignee Title
CN108204598A (en) * 2016-12-16 2018-06-26 中国石油化工股份有限公司 Mix flare burner
CN108204598B (en) * 2016-12-16 2019-09-13 中国石油化工股份有限公司 Mix flare burner
CN112969890A (en) * 2018-10-05 2021-06-15 法孚皮拉德公司 Burner and combustion method for a burner

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EP2981761B1 (en) 2020-05-27
KR20150139575A (en) 2015-12-11
WO2014162074A1 (en) 2014-10-09
PL2981761T3 (en) 2020-11-16
CN105247285B (en) 2017-04-26
FR3004239A1 (en) 2014-10-10
EP2981761A1 (en) 2016-02-10
KR101878346B1 (en) 2018-08-17
ES2813361T3 (en) 2021-03-23
FR3004239B1 (en) 2020-10-23

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