CN110345475A - A kind of premixed anti-backfire Flameless burner - Google Patents
A kind of premixed anti-backfire Flameless burner Download PDFInfo
- Publication number
- CN110345475A CN110345475A CN201910667732.9A CN201910667732A CN110345475A CN 110345475 A CN110345475 A CN 110345475A CN 201910667732 A CN201910667732 A CN 201910667732A CN 110345475 A CN110345475 A CN 110345475A
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- China
- Prior art keywords
- backfire
- fuel
- channel
- premix
- premixed
- Prior art date
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Classifications
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- 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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- 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
-
- 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
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/82—Preventing flashback or blowback
Abstract
The invention belongs to burner arts, and specifically disclose a kind of premixed anti-backfire flameless burner, in which: premixing cell is for obtaining premix fuel and being sent into anti-backfire unit after premixing fuel and air;Anti-backfire unit is used to premix fuel and is sent into injection unit and prevents the generation of tempering phenomenon comprising along the sequentially connected reducing pipe of gas flow direction, anti-backfire channel and Venturi tube;Injection unit is for spraying premix fuel comprising injection channel and the first bluff body.The present invention passes through setting premixing cell, fuel can be mixed with air and uniformly obtain premix fuel, and the generation of tempering phenomenon is effectively prevented using structures such as the reducing pipe of anti-backfire unit, scalable screen and Venturi tubes, simultaneously by the way that contractile swirl vane and the first bluff body are arranged in injection unit, it can be realized being switched fast for warm-up phase and flameless combustion stage, guarantee the stability of burning, while can also realize ultralow NOxDischarge.
Description
Technical field
The invention belongs to burner arts, more particularly, to a kind of premixed anti-backfire flameless burner.
Background technique
It is also increasingly harsh for the discharge standard of pollutant as environmental pollution is getting worse.Because fuel high-temperature fires
Burning can produce a large amount of thermal NOx, in order to solve this problem, propose a kind of new combustion mode-flameless combustion mould
Formula, local high temperature zone is not present in combustion zone under the combustion mode, can substantially reduce thermal NOxProduction quantity, simultaneously because
The uniformity of combustion zone temperature, efficiency of combustion do not reduce.Flameless combustion has combined pollutant low emission and burning effect
Consider of both rate, therefore, there are many patents both at home and abroad, by flameless combustion, it is applied on burner, but is mostly non-
Premix burner, this technical application is less on premix burner, and has that flameless combustion effect is not good enough, combustion stability more
It is lower, tempering risk is larger, flame-out risk is big, complex structure and other problems poor to burning situation adaptability.
CN104990078B proposes a kind of burner that can fast implement flameless combustion, which is by burning
Different phase change the flow velocity sizes of fuel and air and obtain stable flameless combustion, but the burner can be only applied to
Non- premixed combustion can not achieve premix flameless combustion;CN105953219B proposes a kind of flameless combustion apparatus, which passes through
Reflux injector is respectively set in multiple combustion air ejiction openings and comes the realization flameless combustion of injection high-temperature flue gas, still, device effect
Rate is lower, needs to be arranged multiple reflux injectors, and this burner can not be directly applied on existing burner hearth, be needed
Larger transformation is carried out to burner hearth, causes big inconvenience;CN104266190B propose a kind of oxygen-enriched flameless gas burner and
Its control method, which is non-Unitary device, and premixes flaming combustion using burning initial stage, and the later period switchs to non-premix
The mode of flameless combustion, but the Combustion System of the burner difference combustion phases is complex, there are a premix with it is non-pre-
The mixed burning simultaneous stage, and there is higher cooperation requirement, if two fitnesss are not high enough, Jiu Huifa between the two
Raw combustion instability, flameless combustion cannot achieve even flame-out phenomenon, and application is more difficult, while also depositing in the premixed combustion stage
In very big tempering risk.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of premixed anti-backfire flameless combustions
Device, wherein its key component such as structure of anti-backfire unit, injection unit and its specific set-up mode are studied and designed,
It can effectively solve the problems, such as that combustion phases tempering risk is big accordingly, while be also equipped with combustion mode switching efficiently advantage, because
And it is particularly suitable for the application of premixed combustion.
To achieve the above object, the invention proposes a kind of premixed anti-backfire flameless burners, including flow along gas
The sequentially connected premixing cell in direction, anti-backfire unit and injection unit, in which:
The premixing cell is for obtaining premix fuel and being sent into the anti-backfire unit after premixing fuel and air;
The anti-backfire unit is used to that the premix fuel to be sent into the injection unit and prevents the generation of tempering phenomenon,
It includes along the sequentially connected reducing pipe of gas flow direction, anti-backfire channel and Venturi tube, and the reducing pipe is for accelerating
The premix fuel is provided with scalable screen, the scalable grid to prevent the generation of tempering phenomenon in the anti-backfire channel
Plate forms the venturi channel of preset quantity in the anti-backfire channel, for enhancing anti-backfire effect, the venturi
The air jet orifices of preset quantity are provided in pipe on the side wall of divergent segment, for forming air film in the tube wall of the divergent segment,
To further prevent the generation of tempering phenomenon;
The injection unit is for spraying the premix fuel comprising injection channel and the first bluff body, the injection are logical
Road is connect with the outlet of the Venturi tube, and for conveying and spraying the premix fuel, first bluff body is contractably set
It sets in the outside of the injection channel, for forming stable flame in warm-up phase, and it is real using the contraction of first bluff body
The switching of existing warm-up phase and flameless combustion stage.
As it is further preferred that the premixing cell includes premixer, air pipeline, fuel channel and the second bluff body,
The air pipeline and fuel channel connect and are mutually perpendicular to the premixer, with this air are formed with fuel
1/4 circle of contact carries out premix to obtain premix fuel, and the outlet of the air pipeline is arranged in second bluff body, for reinforcing
Premixing effect.
As it is further preferred that the premixer is preferably square, the internal diameter of the fuel channel and air pipeline
The ratio between be 1:10~3:10.
As it is further preferred that the injection unit further includes tapered spray head and swirl vane, the tapered spray head is set
It sets in the outlet of the injection channel, sprays into burner hearth for accelerating the premix fuel, the swirl vane is contractably set
It sets in the injection channel, for driving the premix fuel rotation in warm-up phase.
As it is further preferred that the efflux angle of the reducing pipe is 20 °~75 °.
As it is further preferred that in the anti-backfire channel each venturi channel inlet -duct area and discharge area
It is equal, and the length of converging transition is greater than the length of divergent segment in the venturi channel, and throat opening area is greater than critical throat
Area.
As it is further preferred that the inlet -duct area of the Venturi tube is equal with discharge area, and the Venturi tube
The length of middle converging transition is greater than the length of divergent segment, and throat opening area is greater than critical throat opening area.
As it is further preferred that the angle that the air jet orifices export place wall surface tangent line with the air jet orifices is less than
70°。
As it is further preferred that the gross area of air jet orifices outlet is the 0.05 of the venturi throat area
~0.5 times.
As it is further preferred that the swirl vane is 10mm~200mm at a distance from tapered spray head entrance.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, mainly have below
Technological merit:
1. premixed anti-backfire flameless burner structure provided by the invention is simple, do not need to carry out existing burner hearth larger
Transformation can be applied directly, have preferable economy, while to improve the safety of burner, the present invention is accordingly devised gradually
The structures such as the draw, scalable screen and Venturi tube, can be effectively prevented the generation of tempering phenomenon, furthermore by injection unit
Contractile first bluff body of middle setting can be realized being switched fast for warm-up phase and flameless combustion stage, to ensure that combustion
The stability of burning, and realize premix flameless combustion, it can be reached using premixed anti-backfire flameless burner provided by the invention
Less than 50mg/m3Ultralow NOxDischarge;
2. simultaneously, the present invention is improved by the structure to premixer, carried out so that air and fuel form 1/4 circle of contact
Premix obtains premix fuel, and reinforces premixing effect using the second bluff body, can guarantee that air mixes completely with fuel;
3. especially, the present invention to the angle of reducing pipe in anti-backfire unit, the shape of scalable screen and Venturi tube, with
And the arrangement of air jet orifices and the outlet gross area optimize, and can avoid while guaranteeing anti-backfire effect to fuel
Burning produce bigger effect.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the premixed anti-backfire flameless burner provided according to the preferred embodiment of the present invention;
Fig. 2 is the right view of the premixed anti-backfire flameless burner provided according to the preferred embodiment of the present invention;
Fig. 3 is the partial view of the part D in Fig. 1;
Fig. 4 is the partial view of Tu1Zhong F department;
Fig. 5 is the partial view of Tu1Zhong G department.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
1- air pipeline, 2- air pipeline branch pipe, 3- fuel channel, the premixer 4-, 5- reducing pipe, the scalable screen of 6-, 7-
Anti-backfire channel, 8- Venturi tube, 9- injection channel, 10- swirl vane, the tapered spray head of 11-, the first bluff body of 12-, 13- air
Spray orifice, the second bluff body of 14-.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Fig. 1~5, the invention proposes a kind of premixed anti-backfire flameless burners, including along gas flowing side
To sequentially connected premixing cell, anti-backfire unit and injection unit, in which:
Premixing cell is for obtaining premix fuel and being sent into anti-backfire unit after premixing fuel and air comprising premix
Room 4, fuel channel 3, air pipeline 1 and the second bluff body 14, air pipeline 1 and fuel channel 3 connect with premixer 4 and mutually
Vertically, air and fuel form 1/4 circle of contact with this to carry out premix acquisition premix fuel, do time and premix in advance to increase
Distance, and then enhance premixing effect, the outlet of air pipeline 1 is arranged in fairshaped second bluff body 14, positioned at premix fuel
Downstream position, premix fuel form whirlpool after second bluff body 14, reinforce premixing effect with this;
Anti-backfire unit is used to the premix fuel being sent into injection unit and prevents the generation of tempering phenomenon comprising edge
The sequentially connected reducing pipe 5 of gas flow direction, anti-backfire channel 7 and Venturi tube 8, reducing pipe 5 premix fuel for accelerating,
To make the actual flow velocity for premixing fuel be noticeably greater than theoretical flame spread speed, to prevent the generation of tempering phenomenon, anti-backfire
Scalable screen 6 is provided in channel 7, scalable screen 6 forms the venturi channel of preset quantity in anti-backfire channel 7, makes
Premix fuel is further accelerated in channel, to enhance anti-backfire effect, is arranged on the side wall of divergent segment in Venturi tube 8
There are the air jet orifices 13 of preset quantity, for forming air film in the tube wall of the divergent segment, and promotes wall boundary layer
Air velocity, to further prevent the generation of tempering phenomenon, which connect with air pipeline branch pipe 2;
Injection unit includes injection channel 9, tapered spray head 11, swirl vane 10 and the first bluff body 12, injection channel 9 and text
The outlet of venturi 8 connects, and for conveying and spraying premix fuel, tapered spray head 11 is arranged in the outlet of injection channel 9, is used for
Accelerating premix fuel to spray into burner hearth, swirl vane 10 is contractably arranged in injection channel 9, when warm-up phase, eddy flow leaf
Piece 10 drives premix fuel rotation, and when the flameless combustion stage, swirl vane 10 is adjacent to the inner wall of burner, the first bluff body after shrinking
12 are contractably arranged in the outside of injection channel 9, and when warm-up phase, the first bluff body 12, which is used to be formed in warm-up phase, stablizes fire
Flame, when the flameless combustion stage, the first bluff body 12 is adjacent to the outer wall of burner after shrinking, for convenience of the switching for carrying out combustion mode,
Swirl vane 10 and the first mutually linkage of bluff body 12, can be shunk simultaneously.
Further, in premixing cell, premixer 4 is preferably square, and because its structure is more symmetrical, is conducive to fuel and sky
Gas is evenly distributed in premixer 4, obtains preferable mixed effect;The ratio between internal diameter of fuel channel 3 and air pipeline 1 is preferably
1:10~3:10 is conducive to the completely burned of combustion gas to guarantee that the air concentration in premixer 4 is much higher than gas concentration.
Further, in anti-backfire unit, the efflux angle of reducing pipe 5 is preferably 20 °~75 °, for carrying out to premix fuel
It is appropriate to accelerate, and it is not obviously improved flow resistance;The inlet -duct area of the venturi channel formed in anti-backfire channel 7 and outlet
Area equation, and the length of converging transition is greater than the length of divergent segment in the venturi channel, and throat opening area is greater than critical
Throat opening area makes premix fuel actual flow velocity be noticeably greater than its theoretical fire so that premix fuel is further accelerated in channel
Flame transmission speed, and flow resistance is not dramatically increased, to further enhance anti-backfire effect;Meanwhile the import of Venturi tube 8
Area is equal with discharge area, and the length of converging transition is greater than the length of divergent segment in the Venturi tube 8, and throat opening area is big
In critical throat opening area;
In addition, for the angle of wall surface tangent line where air jet orifices 13 and the air jet orifices 13 outlet less than 70 °, the angle is excessive
The purging effect that will cause air is unobvious, and the gross area that air jet orifices 13 export is 8 throat opening area of Venturi tube
0.05 times~0.5 times, the too small air capacity that will cause ejection of the gross area that air jet orifices 13 export is very few, can not effectively purge
Wall surface can not play the role of moderate combustion gas, prevent tempering, but the gross area of the outlet of air jet orifices 13 is excessive to will lead to entrance
Air capacity it is excessive, be unfavorable for burning.
Further, in injection unit, swirl vane 10 is preferably 10mm~200mm at a distance from tapered 11 entrance of spray head,
The distance can not only avoid swirl vane 10 from colliding with tapered 11 hypotelorism of spray head, and can obtain preferable rotation
Flow effect.
According to a preferred embodiment of the invention, the section of premixer 4 is the rectangle of 290mm × 190mm, air pipeline 1
It is set to the front end of premixer 4, the diameter of the air pipeline 1 is 65mm and import direction is parallel with the axis of burner, gradually
The efflux angle of the draw 5 is 43 °, and the length of converging transition is the 2 of flaring segment length in the venturi conduit formed in anti-backfire channel 7
Times, the length of converging transition is 3 times of flaring segment length in Venturi tube, and air jet orifices 13 are cut with 13 outlet wall of air jet orifices
The angle of line is 65 °, and the gross area that air jet orifices 13 export is the 1/8 of 8 throat opening area of Venturi tube.
The specific work process of premixed anti-backfire flameless burner provided by the invention is illustrated below: air
Enter premixer 4 by air pipeline 1, fuel enters premixer 4 by fuel channel 3, and air and fuel mix in premixer
It closes uniformly acquisition premix fuel and accelerates and enter anti-backfire channel 7 by reducing pipe 5, pass through the venturi in anti-backfire channel 7
Enter Venturi tube 8 behind channel, finally enter injection unit, warm-up phase opens swirl vane 10 and the first bluff body 12, premix
Fuel obtains certain eddy flow degree by swirl vane 10, and sprays into burner hearth after accelerating by tapered spray head 11, and blunt first
Vortex structure is formed after body 12, carries out stable flaming combustion, the flameless combustion stage is switched to after stabilization to be combusted, shrink rotation
Blade 10 and the first bluff body 12 are flowed, it is made to be adjacent to the inner and outer wall of burner respectively, premixes fuel directly from tapered spray head 11
Accelerate to spray into burner hearth, the long range injection volume for premixing fuel inhales a large amount of high-temperature flue gas, dilutes and heat fuel, low temperature is low in formation
The flameless combustion of oxygen simultaneously constantly maintains down by the heat that flameless combustion generates.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of premixed anti-backfire flameless burner, which is characterized in that including along the sequentially connected premix of gas flow direction
Unit, anti-backfire unit and injection unit, in which:
The premixing cell is for obtaining premix fuel and being sent into the anti-backfire unit after premixing fuel and air;
The anti-backfire unit is wrapped for the premix fuel to be sent into the injection unit and prevents the generation of tempering phenomenon
It includes along the sequentially connected reducing pipe of gas flow direction (5), anti-backfire channel (7) and Venturi tube (8), the reducing pipe (5)
For accelerating the premix fuel, to prevent the generation of tempering phenomenon, scalable screen is provided in the anti-backfire channel (7)
(6), the scalable screen (6) forms the venturi channel of preset quantity in the anti-backfire channel (7), anti-for enhancing
Tempering effect is provided with the air jet orifices (13) of preset quantity in the Venturi tube (8) on the side wall of divergent segment, at this
Air film is formed in the tube wall of divergent segment, to further prevent the generation of tempering phenomenon;
The injection unit is for spraying the premix fuel comprising injection channel (9) and the first bluff body (12), the injection
Channel (9) is connect with the outlet of the Venturi tube (8), for conveying and spraying the premix fuel, first bluff body
(12) outside of the injection channel (9) is contractably set, for forming stable flame in warm-up phase, and described in utilization
The switching of warm-up phase and flameless combustion stage is realized in the contraction of first bluff body (12).
2. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that the premixing cell includes premix
Room (4), air pipeline (1), fuel channel (3) and the second bluff body (14), the air pipeline (1) and fuel channel (3) and institute
It states premixer (4) to connect and be mutually perpendicular to, makes the air form 1/4 circle of contact with fuel with this and premix obtaining
Fuel is premixed, second bluff body (14) is arranged in the outlet of the air pipeline (1), for reinforcing premixing effect.
3. premixed anti-backfire flameless burner as claimed in claim 2, which is characterized in that the premixer (4) is preferably
Square, the ratio between the fuel channel (3) and the internal diameter of air pipeline (1) are 1:10~3:10.
4. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that the injection unit further includes gradually
Contracting spray head (11) and swirl vane (10), tapered spray head (11) setting are used in the outlet of the injection channel (9) by institute
It states premix fuel to accelerate to spray into burner hearth, the swirl vane (10) is contractably arranged in the injection channel (9), is used for
Warm-up phase drives the premix fuel rotation.
5. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that the jet stream of the reducing pipe (5)
Angle is 20 °~75 °.
6. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that in the anti-backfire channel (7)
The inlet -duct area of each venturi channel is equal with discharge area, and the length of converging transition is greater than in the venturi channel
The length of divergent segment, throat opening area are greater than critical throat opening area.
7. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that the Venturi tube (8) into
Open area is equal with discharge area, and the length of converging transition is greater than the length of divergent segment, throat face in the Venturi tube (8)
Product is greater than critical throat opening area.
8. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that the air jet orifices (13) with should
The angle of wall surface tangent line is less than 70 ° where air jet orifices (13) outlet.
9. premixed anti-backfire flameless burner as described in claim 1, which is characterized in that air jet orifices (13) outlet
The gross area be 0.05~0.5 times of the Venturi tube (8) throat opening area.
10. premixed anti-backfire flameless burner as described in any one of claims 1 to 9, which is characterized in that the eddy flow leaf
Piece (10) is 10mm~200mm at a distance from tapered spray head (11) entrance.
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CN201910667732.9A CN110345475B (en) | 2019-07-23 | 2019-07-23 | Premixing type anti-backfire flameless combustor |
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CN201910667732.9A CN110345475B (en) | 2019-07-23 | 2019-07-23 | Premixing type anti-backfire flameless combustor |
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CN110345475A true CN110345475A (en) | 2019-10-18 |
CN110345475B CN110345475B (en) | 2020-05-19 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110608433A (en) * | 2019-10-24 | 2019-12-24 | 广西霄能绿色科技有限公司 | Venturi combustion nozzle for combusting biomass powder fuel |
CN114459055A (en) * | 2022-01-25 | 2022-05-10 | 哈尔滨工业大学 | Multilayer orifice plate type premixed gas turbine combustor |
CN114659105A (en) * | 2022-01-07 | 2022-06-24 | 清华大学 | Straight rod type premix burner and low-nitrogen combustion method |
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CN104266190A (en) * | 2014-10-09 | 2015-01-07 | 中冶南方(武汉)威仕工业炉有限公司 | Oxygen-enriched and flameless gas burner and control method thereof |
CN104990078A (en) * | 2015-07-20 | 2015-10-21 | 北京大学 | Combustor capable of quickly realizing flameless combustion |
CN109631033A (en) * | 2018-12-14 | 2019-04-16 | 同济大学 | A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device |
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US5395235A (en) * | 1993-04-01 | 1995-03-07 | General Electric Company | Catalytic preburner |
CN1865774A (en) * | 2006-04-30 | 2006-11-22 | 西安交通大学 | Smoke-controllable self-circulating type burner with low pollution |
CN103528060A (en) * | 2013-09-25 | 2014-01-22 | 杭州电子科技大学 | Combustion radiator and combustion method of multi-ejecting-tangent-circle premixing porous medium gas stove |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN110608433A (en) * | 2019-10-24 | 2019-12-24 | 广西霄能绿色科技有限公司 | Venturi combustion nozzle for combusting biomass powder fuel |
CN114659105A (en) * | 2022-01-07 | 2022-06-24 | 清华大学 | Straight rod type premix burner and low-nitrogen combustion method |
CN114659105B (en) * | 2022-01-07 | 2022-12-30 | 清华大学 | Straight rod type premix burner and low-nitrogen combustion method |
CN114459055A (en) * | 2022-01-25 | 2022-05-10 | 哈尔滨工业大学 | Multilayer orifice plate type premixed gas turbine combustor |
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