CN116398880B - Micro-scale pure hydrogen fuel premixing burner - Google Patents
Micro-scale pure hydrogen fuel premixing burner Download PDFInfo
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- CN116398880B CN116398880B CN202310464297.6A CN202310464297A CN116398880B CN 116398880 B CN116398880 B CN 116398880B CN 202310464297 A CN202310464297 A CN 202310464297A CN 116398880 B CN116398880 B CN 116398880B
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- 239000000446 fuel Substances 0.000 title claims abstract description 90
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000001257 hydrogen Substances 0.000 title claims abstract description 26
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 85
- 238000001816 cooling Methods 0.000 claims abstract description 55
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 239000007800 oxidant agent Substances 0.000 claims description 13
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000000563 Verneuil process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- 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
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- 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
- F23D14/78—Cooling burner parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
A micro-scale pure hydrogen fuel premixing burner belongs to the technical field of efficient clean combustion. The invention solves the problems of poor flame combustion stability and poor flame fusion degree of the existing burner. The flange is sequentially communicated with a fuel inlet, a fuel distribution cavity and a plurality of first nozzle mounting holes, the end cover is provided with a plurality of second nozzle mounting holes and a plurality of cooling holes, the micro-mixing nozzles, the first nozzle mounting holes and the second nozzle mounting holes are the same in number, two ends of the micro-mixing nozzles are respectively inserted in the first nozzle mounting holes and the second nozzle mounting holes correspondingly, the nozzle main body comprises a premixing section and an expanding section which are coaxial and are fixedly connected integrally, a plurality of air holes which are cyclone air inlet are formed in the side wall of the premixing section along the circumferential direction of the premixing section, the air holes are communicated with the air distribution cavity, the mounting section is provided with the fuel holes, and two ends of the fuel holes are respectively communicated with the fuel distribution cavity and the premixing section.
Description
Technical Field
The invention relates to a micro-scale pure hydrogen fuel premix burner, and belongs to the technical field of efficient clean combustion.
Background
Carbon-free fuels have been widely appreciated and studied in order to reduce greenhouse gas emissions and their effects on the climate, and in particular hydrogen has been increasingly used in gas turbine combustors, boilers, kiln furnaces and the like. However, hydrogen has the characteristics of high flame propagation speed and high combustion temperature, so that the problems of poor flame stability and high NOx emission occur when the hydrogen is applied to a traditional combustor. In particular, under high temperature and high pressure operating conditions, conventional burners have failed to meet stability and pollutant emission requirements in hydrogen combustion.
Along with the continuous research of the high-efficient clean combustion technology in recent years, various combustors with different structures appear, and pollutant emission can be reduced to a certain extent, but the existing combustor structure still has the problems of low structural adaptability and complex structure, meanwhile, flame stability needs to be further improved, in addition, due to structural limitation, the cooling holes in the prior art are generally formed in the wall of the flame tube, the cooling of the end cover and the nozzle cannot be realized, the temperatures of the end cover and the nozzle are too high, and the fusion degree of flame is further enhanced. Accordingly, there is a need for a burner that can effectively stabilize the flame and cool the nozzle to reduce the degree of flame fusion and thus reduce the emission of pollutants such as NOx.
Disclosure of Invention
The invention aims to solve the technical problems and further provides a micro-scale pure hydrogen fuel premix burner.
The technical scheme adopted by the invention for solving the technical problems is as follows:
A micro-scale pure hydrogen fuel premixing burner comprises a casing, a flange, a flame tube, an end cover and a plurality of micro-mixing nozzles, wherein the flange is fixedly arranged at one end of the casing,
The flame tube is coaxially arranged in the casing in a penetrating way, a gap exists between the outer wall of the flame tube and the inner wall of the casing, the end cover is integrally and fixedly arranged at one end of the flame tube, which is close to the flange, a gap exists between the end cover and the flange as an air distribution cavity,
The flange is sequentially communicated with a fuel inlet, a fuel distribution cavity and a plurality of first nozzle mounting holes, the end cover is provided with a plurality of second nozzle mounting holes and a plurality of cooling holes,
The micro-mixing nozzle, the first nozzle mounting hole and the second nozzle mounting hole are arranged in the same quantity, two ends of the micro-mixing nozzle are respectively correspondingly inserted into the first nozzle mounting hole and the second nozzle mounting hole,
The micro-mixing nozzle comprises a nozzle body and a mounting section integrally fixedly arranged at one end of the nozzle body, wherein the nozzle body comprises a premixing section and an expanding section which are coaxially and integrally communicated and fixedly connected, a plurality of air holes which are cyclone air inlet are formed in the side wall of the premixing section along the circumferential direction of the premixing section, the air holes are communicated with an air distribution cavity, a fuel hole is formed in the mounting section, and two ends of the fuel hole are respectively communicated with the fuel distribution cavity and the premixing section.
Further, when the plurality of air holes are arranged in a multi-ring shape coaxially along the axial direction of the nozzle body, the apertures of the plurality of air holes are equal or are sequentially reduced along the direction from one end to the other end of the nozzle body.
Further, the number of the fuel holes is a plurality, and the fuel holes are arranged in a single ring shape or a coaxial multiple ring shape.
Further, the aperture of the fuel hole is 0.6 mm-10 mm; the aperture of the air hole is 0.5 mm-7 mm.
Further, the distance L1 between the outlet end of the fuel hole and the central axis of the most upstream air hole is 1 mm-10 mm; when a plurality of air holes are coaxially arranged in a multi-ring shape along the axial direction of the nozzle body, the distance L2 between the central axes of the air holes of each two adjacent rings is 2-20 mm, and the vertical distance L3 between the central axes of the air holes close to the other end of the nozzle body and the other end of the nozzle body is 20-120 mm; the swirl angle of the air flow is 30-60 degrees.
Further, the length L4 of the expansion section is 1 mm-20 mm, and the expansion angle is 30-120 degrees.
Further, the inner diameter of the nozzle main body of the micro-mixing nozzle is 5-15 mm, and the whole length of the micro-mixing nozzle is 20-170 mm; the distance between the central axes of every two adjacent micro-mixing nozzles is 6 mm-90 mm.
Further, the micro-mixing nozzle is in threaded connection with the second nozzle mounting hole.
Further, the other end of the nozzle body protrudes beyond the end cap.
Further, the micro-mixing nozzles are arranged in an array, and the cooling holes are respectively arranged around each micro-mixing nozzle and between the micro-mixing nozzle at the outermost side and the flame tube.
Compared with the prior art, the invention has the following effects:
1. In the micro-scale pure hydrogen fuel premix burner, fuel is injected into the premix section of the nozzle body from the fuel hole, oxidant is injected into the premix section from the air hole, the fuel and the oxidant are mixed by internal cross jet flow under the micro-scale condition, and a reflux zone is formed at the outlet of the nozzle under the action of the air swirl and the expansion section, so that flame stable combustion is realized, the mixing intensity is enhanced, the mixing degree of the fuel and the oxidant is improved, the temperature graduation uniformity of the burner is further improved, and the low NOx emission is realized.
2. Because of the structural limitation of the burner in the prior art, the cooling holes are generally formed in the wall of the flame tube, and cooling at the end cover and the nozzle cannot be realized. The cooling holes are arranged at the end cover, so that the end cover and the micro-mixing nozzle can be cooled, meanwhile, in the air countercurrent process, the cooling protection effect of the flame tube can be realized in the prior art, and compared with the prior art, the flame fusion degree can be effectively reduced, and the NOx emission is reduced.
3. By changing the diameter of the micro-mixing nozzles, the number of the micro-mixing nozzle arrangements and the range of working conditions (equivalence ratio, dilution amount, outlet flow rate, etc.), a larger steady burning load adjustment ratio is realized.
4. The burner has the characteristics of simple structure and convenient maintenance, and can be exchanged with the traditional burner device. The burner has high volume heat intensity, compact structure and high integration degree. The operation range is wide, the gas mixing device can operate under the requirements of working conditions of 30-80 m/s of gas mixing outlet flow rate, 0.5-1.0 equivalent ratio and 0-30% water mixing amount, the temperature distribution of a flue gas outlet is uniform, and the outlet temperature distribution coefficient OTDF is less than or equal to 15%. The pollutant emission of the burner is low, the combustion efficiency is more than or equal to 99 percent, and the NOx@15% O2 is less than or equal to 10ppm. The burner adopts countercurrent arrangement, the pressure loss is low, the total pressure recovery coefficient is more than or equal to 95%, and the cooling air can keep a lower temperature so as to play a role in cooling and protecting the flame tube. The combustion stability is strong, the pure hydrogen fuel can be combusted, and the combustion is stable under the condition of high equivalent ratio.
Drawings
FIG. 1 is a schematic diagram of a micro-scale pure hydrogen fuel premix burner in a main cross-section;
FIG. 2 is an enlarged schematic view of FIG. 1 at A;
FIG. 3 is a schematic view (partially cut-away) of a first perspective structure of a micro-scale pure hydrogen fuel premix burner according to the present invention;
FIG. 4 is a second perspective view (partially cut away) of a micro-scale pure hydrogen fuel premix burner according to the present invention;
FIG. 5 is a schematic left-hand view of a cartridge with an end cap mounted thereto;
FIG. 6 is a schematic perspective view (semi-cutaway) of a flame tube with an end cap installed;
FIG. 7 is a schematic perspective view of a casing;
FIG. 8 is a schematic left-hand view of a micro-mixing nozzle;
FIG. 9 is a schematic front cross-sectional view of a micro-mixing nozzle;
FIG. 10 is a schematic perspective view of a micro-mixing nozzle;
fig. 11 is a schematic perspective view of a flange.
In the figure: 1. a casing; 2. a flange; 21. a fuel inlet; 22. a fuel distribution chamber; 23. a first nozzle mounting hole; 3. a flame tube; 4. an end cap; 41. a second nozzle mounting hole; 42. a cooling hole; 5. a micro-mixing nozzle; 51. a nozzle body; 51-1, a premixing section; 51-2, an expansion section; 51-11, air holes; 52. a mounting section; 52-1, fuel holes; 53. a limiting ring plate; 6. an air distribution chamber; 7. an air inlet; 8. a fixed ring plate; 100. a fuel; 101. an oxidizing agent; 102. flue gas.
Detailed Description
The first embodiment is as follows: the present embodiments will be described in detail and clearly with reference to fig. 1 to 11, and it is apparent that the described embodiments are only some embodiments, but not all embodiments of the present invention, and all other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention based on the embodiments of the present invention.
It should be noted that, the descriptions of the directions of "left", "right", "upper", "lower", "top", "bottom", and the like of the present invention are defined based on the relation of orientations or positions shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the structures must be constructed and operated in a specific orientation, and thus, the present invention should not be construed as being limited thereto. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The micro-scale pure hydrogen fuel premixing burner comprises a casing 1, a flange 2, a flame tube 3, an end cover 4 and a plurality of micro-mixing nozzles 5, wherein the flange 2 is fixedly arranged at one end of the casing 1,
The flame tube 3 is coaxially arranged in the casing 1 in a penetrating way, a gap exists between the outer wall of the flame tube 3 and the inner wall of the casing 1, the end cover 4 is integrally and fixedly arranged at one end of the flame tube 3 close to the flange 2, a gap exists between the end cover 4 and the flange 2 as an air distribution cavity 6,
The flange 2 is sequentially provided with a fuel inlet 21, a fuel distribution cavity 22 and a plurality of first nozzle mounting holes 23 in a communicated manner, the end cover 4 is provided with a plurality of second nozzle mounting holes 41 and a plurality of cooling holes 42,
The micro-mixing nozzle 5, the first nozzle mounting hole 23 and the second nozzle mounting hole 41 are arranged in the same quantity, two ends of the micro-mixing nozzle 5 are respectively correspondingly inserted into the first nozzle mounting hole 23 and the second nozzle mounting hole 41,
The micro-mixing nozzle 5 comprises a nozzle main body 51 and a mounting section 52 integrally fixedly arranged at one end of the nozzle main body 51, the nozzle main body 51 comprises a premixing section 51-1 and an expanding section 51-2 which are coaxially and integrally communicated and fixedly connected, a plurality of air holes 51-11 which are spirally inlet air are processed on the side wall of the premixing section 51-1 along the circumferential direction of the side wall, the air holes 51-11 are communicated with the air distribution cavity 6, the mounting section 52 is provided with fuel holes 52-1, and two ends of the fuel holes 52-1 are respectively communicated with the fuel distribution cavity 22 and the premixing section 51-1.
In the burner, one end close to the flange 2 is the front end, the other end is the rear end, air enters through an air inlet 7 positioned at the rear end of the burner, and flame is sprayed out through the rear end. The average inlet temperature of the fuel 100 and air was 120 ℃.
A cylindrical through hole is formed in the premixing section 51-1, a circular truncated cone-shaped through hole is formed in the expanding section 51-2, and the small diameter end of the circular truncated cone-shaped through hole is communicated with one end of the cylindrical through hole.
Inputting fuel 100 into the micro-mixing nozzle 5 through the fuel hole 52-1; an oxidizing agent 101 is introduced into the micro-mixing nozzle 5 through the air holes 51-11.
The micro-mixing nozzles 5 are relatively independent and are arranged in an array mode, and the array arrangement mode is a matrix or a circumferential array. The fuel and the oxidizer are mixed and ejected through the micro-mixing nozzle 5.
The fuel holes 52-1 are arranged at the top end of the micro-mixing nozzle 5, are round, square or elliptical in shape, and are 1-16 in number, and adopt a direct injection air inlet mode; the central axis of the fuel hole 52-1 is disposed in parallel with the central axis of the nozzle body 51.
The air holes 51-11 are formed in the wall surface of the main body located in the air distribution chamber 6 on the micro-mixing nozzle 5, and are circular in shape and 4-48 in number. The plurality of air holes 51-11 are arranged in a single ring or in multiple rings coaxial along the axial direction of the nozzle body 51.
The mounting section 52 is a cylindrical section structure. The cross-section of the passageway in the nozzle body 51 is circular.
The expansion section 51-2 is arranged in the micro-mixing nozzle 5, so that a backflow area is formed at the outlet of the micro-mixing nozzle 5, stable combustion of flame is ensured, and hydrogen fuel can be combusted.
In the micro-scale pure hydrogen fuel premix burner, fuel is injected into the premix section 51-1 of the nozzle body from the fuel hole 52-1, oxidant is injected into the premix section 51-1 from the air hole 51-11, the fuel and the oxidant are mixed by internal cross jet flow under the micro-scale condition, and a reflux zone is formed at the outlet of the nozzle under the action of the air swirl and the expansion section 51-2, so that flame stable combustion is realized, the mixing intensity is enhanced, the mixing degree of the fuel and the oxidant is improved, the temperature indexing uniformity of the burner is further improved, and low NOx emission is realized.
Each air hole 51-11 is disposed obliquely to the axis of the nozzle body 51, the oblique directions of the air holes 51-11 are the same, and the axes of the air holes 51-11 in the same ring are located in the same plane. The oxidant enters the nozzle body 51 through a plurality of air holes 51-11 in a cyclone air inlet mode, so that stable combustion of flame is ensured.
The small nozzle size and higher outlet flow rate reduce the risk of hydrogen flashback. Higher outlet flow rates are achieved by smaller nozzle diameters, and higher inlet flow rates.
The burner has high integration degree and large volume heat intensity. The burner can be connected with an air and fuel supply system of a traditional burner, and has high adaptability;
By changing the diameter of the micro-mixing nozzles 5, the number of the micro-mixing nozzles 5 arranged, and the range of the working conditions (equivalence ratio, dilution amount, outlet flow rate, etc.), a larger steady-combustion load adjustment ratio is realized.
The countercurrent structure is arranged, air enters from the tail part of the burner, and the cooling protection effect on the casing 1 and the flame tube 3 is enhanced.
The prior art burner is limited by the structure, and the cooling holes 42 are generally formed on the wall of the flame tube 3, so that cooling at the end cover 4 and the nozzle cannot be realized. The cooling holes 42 are arranged at the end cover 4, so that the end cover 4 and the micro-mixing nozzle 5 can be cooled, and meanwhile, in the air countercurrent process, the cooling protection effect of the flame tube 3 can be realized in the prior art, and compared with the prior art, the flame fusion degree can be effectively reduced, and the NOx emission can be reduced.
The cooling holes 42 have a circular, square or oval cross-sectional shape. The inner diameter of each cooling hole 42 may be selected according to its position on the end cover 4, and a micro-scale pure hydrogen fuel premix burner of the present invention preferably divides the cooling holes 42 into two different inner diameter sizes, a plurality of cooling holes are arranged around each micro-mixing nozzle 5, a plurality of cooling holes are arranged between the micro-mixing nozzle 5 located at the outermost side and the flame tube 3, wherein the inner diameter size of the cooling holes 42 arranged around each micro-mixing nozzle 5 is smaller than the inner diameter size of the cooling holes 42 located between the micro-mixing nozzle 5 located at the outermost side and the flame tube 3.
The burner has the characteristics of simple structure and convenient maintenance, and can be exchanged with the traditional burner device. The burner has high volume heat intensity, compact structure and high integration degree. The operation range is wide, the gas mixing device can operate under the requirements of working conditions of 30-80 m/s of gas mixing outlet flow rate, 0.5-1.0 equivalent ratio and 0-30% water mixing amount, the outlet temperature of the flue gas 102 is uniformly distributed, and the outlet temperature distribution coefficient OTDF is less than or equal to 15%. The pollutant emission of the burner is low, the combustion efficiency is more than or equal to 99 percent, and the NOx@15% O2 is less than or equal to 10ppm. The burner adopts countercurrent arrangement, the pressure loss is low, the total pressure recovery coefficient is more than or equal to 95%, and the cooling air can keep a lower temperature so as to play a role in cooling and protecting the flame tube 3. The combustion stability is strong, the pure hydrogen fuel can be combusted, and the combustion is stable under the condition of high equivalent ratio.
Compared with the prior art, the burner has the advantages that the air side gas momentum is larger, the swirling effect is better, and the mixing effect of air and fuel is better.
One end of the casing 1 is integrally and fixedly provided with a fixed ring plate 8, and the flange 2 is fixedly arranged at one end of the casing 1 through the fixed ring plate 8. The fixed ring plate 8 is provided with a plurality of first fixed holes, the flange 2 is provided with a plurality of second fixed holes corresponding to the first fixed holes in number, the first fixed holes and the second fixed holes are in one-to-one correspondence, and the flange 2 and the casing 1 are fixedly connected through bolts correspondingly penetrating through the first fixed holes and the second fixed holes.
When the plurality of air holes 51-11 are arranged in a multi-annular shape coaxially along the axial direction of the nozzle body 51, the apertures of the plurality of air holes 51-11 are equal or are sequentially reduced in the direction from one end to the other end of the nozzle body 51.
The number of fuel holes 52-1 is plural and arranged in a single ring or a coaxial multiple ring. By such design, the arrangement of the plurality of fuel holes 52-1 can lead the fuel to be distributed more uniformly in the nozzle main body 51, realize better mixing effect in a shorter mixing distance, effectively shorten the length of the premixing section 51-1 and lead the structure to be more compact. In addition, the arrangement of the plurality of fuel holes 52-1 can improve the fuel outlet flow rate, increase the fuel momentum, enhance the mixing effect, lead more heat away by the increase of the fuel flow rate, realize better cooling, enhance the cooling effect near the fuel holes 52-1 and ensure safety.
The aperture of the fuel hole 52-1 is 0.6 mm-10 mm; the air holes 51-11 have a diameter of 0.5mm to 7mm.
The distance L1 between the outlet end of the fuel hole 52-1 and the central axis of the most upstream air hole 51-11 is 1 mm-10 mm; when the air holes 51-11 are coaxially arranged in a multi-ring shape along the axial direction of the nozzle main body 51, the distance L2 between the central axes of the air holes 51-11 of each two adjacent rings is 2 mm-20 mm, and the vertical distance L3 between the central axes of the air holes 51-11 close to the other end of the nozzle main body 51 and the other end of the nozzle main body 51 is 20 mm-120 mm; the swirl angle of the air flow is 30-60 degrees.
The length L4 of the expansion section 51-2 is 1 mm-20 mm, and the expansion angle is 30-120 degrees.
The inner diameter of the nozzle main body 51 of the micro-mixing nozzle 5 is 5-15 mm, and the whole length of the micro-mixing nozzle 5 is 20-170 mm; the distance between the central axes of every two adjacent micro-mixing nozzles 5 is 6 mm-90 mm.
The micro-mixing nozzle 5 is screwed with the second nozzle mounting hole 41. So designed, the micro-mixing nozzle 5 and the end cover 4 are convenient to mount and dismount. The outside of the nozzle main body 51 is coaxially and fixedly provided with a limiting ring plate 53, and one end, far away from the flange 2, of the limiting ring plate 53 is attached to one end face of the end cover 4. The limiting ring plate 53 is used for limiting the mounting positions of the micro-mixing nozzle 5 and the end cover 4.
The other end of the nozzle body 51 is provided protruding from the end cap 4. So designed, the outlet plane of the nozzle main body 51 is at a certain distance from the end cover 4, so that flame is far away from the end cover 4, the problem of flame oscillation is avoided, and meanwhile, the purpose of protecting the end cover 4 is achieved, and the distance between the outlet plane of the nozzle main body 51 and the end cover 4 is 1-100 mm.
The micro-mixing nozzles 5 are arranged in an array, and the cooling holes 42 are respectively arranged around each micro-mixing nozzle 5 and between the micro-mixing nozzle 5 at the outermost side and the flame tube 3. So designed, 3-12 cooling holes 42 are distributed around each micro-mixing nozzle 5, the aperture is 1-10 mm, the air is introduced in a direct injection or rotational flow air inlet mode, and the arrangement direction and the axial included angle of the burner are 0-60 degrees. By arranging several cooling holes 42 around each micro-mixing nozzle 5, cooling protection of the micro-mixing nozzle 5 is achieved and excessive fusion of adjacent nozzle flames is prevented from generating excessive pollutant emissions. The cooling flue gas 102 is cooled to protect the flame tube 3 by arranging a plurality of cooling holes 42 between the nozzle and the flame tube 3, wherein the cooling holes 42 at the position have the aperture of 1 mm-15 mm and are distributed in a circle or a plurality of circles, and the number of the cooling holes 42 in each circle is 4-24.
The second embodiment is as follows: 1-11, a plurality of micro-mixing nozzles are arranged in a circumferential array, the inner diameter of a nozzle body of the micro-mixing nozzle is 10mm, and the whole length of the micro-mixing nozzle is 47mm; the distance between the central axes of every two adjacent micro-mixing nozzles is 36mm. Each micro-mixing nozzle is provided with 8 fuel holes and 24 air holes. The cross section of the fuel hole is circular, the inner diameter of the fuel hole is 1.2mm, the fuel holes are arranged on the circumference with the diameter of 2mm at equal intervals in a single ring mode, and air is introduced in a direct injection mode; the air holes are circular in cross section, 2mm in inner diameter, and are distributed on the wall surface of the nozzle body in the air distribution cavity at equal intervals in a three-ring mode, air is introduced in a rotational flow mode, and the rotational flow angle is 45 degrees. Every ring is provided with 8 air holes, the distance between the central axes of every two adjacent annular air holes is 4mm, the distance L1 between the outlet end of the fuel hole and the central axis of the air hole at the most upstream is 3mm, and the vertical distance L3 between the central axis of the air hole close to the other end of the nozzle body and the other end of the nozzle body is 35mm. The air hole near the other end of the nozzle body is the most downstream air hole.
The length L4 of the expansion section is 7mm, and the expansion angle is 50 degrees. The distance between the outlet plane of the nozzle body and the end cap was 20mm.
6 Cooling holes are distributed around the micro-mixing nozzle at the center position, and 4 cooling holes are distributed around the other micro-mixing nozzles for cooling and protecting the nozzles. The inner diameter of the cooling hole around the nozzle is 2mm, and the cooling holes are circumferentially distributed at equal intervals in five rings, wherein the number of the cooling holes in one ring and the two rings is 6, and the number of the cooling holes in the three rings, the four rings and the five rings is 12, and a direct injection air inlet mode is adopted. A ring of cooling holes are arranged between the micro-mixing nozzle at the outermost side and the flame tube, the ring of cooling holes are round, the inner diameter of the ring of cooling holes is 3mm, the ring of cooling holes are circumferentially arranged, and the number of the ring of cooling holes is 24.
The air enters the burner from the air inlet, and the oxidant (namely air) is divided into cooling air and combustion air through the air distribution cavity, the cooling air enters the combustion chamber through the cooling holes, the micro-mixing nozzle and the flame tube are cooled and protected, and the ratio of the mass flow of the cooling air to the volume flow of the air is 0.15. The combustion air is mixed with fuel entering from the fuel holes through the air holes and then enters the flame tube to be combusted, so that smoke is generated.
Other compositions and connection relationships are the same as those of the first embodiment.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. A micro-scale pure hydrogen fuel premix burner is characterized in that: comprises a casing (1), a flange (2), a flame tube (3), an end cover (4) and a plurality of micro-mixing nozzles (5), wherein the flange (2) is fixedly arranged at one end of the casing (1),
The flame tube (3) is coaxially arranged in the casing (1) in a penetrating way, a gap is reserved between the outer wall of the flame tube (3) and the inner wall of the casing (1), the end cover (4) is integrally and fixedly arranged at one end, close to the flange (2), of the flame tube (3), a gap is reserved between the end cover (4) and the flange (2) to serve as an air distribution cavity (6),
The flange (2) is sequentially communicated with a fuel inlet (21), a fuel distribution cavity (22) and a plurality of first nozzle mounting holes (23), the end cover (4) is provided with a plurality of second nozzle mounting holes (41) and a plurality of cooling holes (42),
The micro-mixing nozzles (5), the first nozzle mounting holes (23) and the second nozzle mounting holes (41) are arranged in the same number, two ends of the micro-mixing nozzles (5) are respectively correspondingly inserted into the first nozzle mounting holes (23) and the second nozzle mounting holes (41),
The micro-mixing nozzle (5) comprises a nozzle main body (51) and a mounting section (52) integrally and fixedly arranged at one end of the nozzle main body (51), the nozzle main body (51) comprises a premixing section (51-1) and an expanding section (51-2) which are coaxially and integrally communicated and fixedly connected, a plurality of air holes (51-11) which are spirally inflow are formed in the side wall of the premixing section (51-1) along the circumferential direction of the premixing section, the air holes (51-11) are communicated with an air distribution cavity (6), a fuel hole (52-1) is formed in the mounting section (52), and two ends of the fuel hole (52-1) are respectively communicated with the fuel distribution cavity (22) and the premixing section (51-1);
A plurality of cooling holes (42) are respectively arranged around each micro-mixing nozzle (5) and between the micro-mixing nozzle (5) positioned at the outermost side and the flame tube (3);
Fuel is injected into a premixing section (51-1) of the nozzle body from a fuel hole (52-1), oxidant is injected into the premixing section (51-1) from an air hole (51-11), the fuel and the oxidant are mixed by internal cross jet flow under the micro-scale condition, and a backflow area is formed at the outlet of the nozzle under the action of an air swirl and expansion section (51-2) to realize flame-stable combustion;
The aperture of the fuel hole (52-1) is 0.6 mm-10 mm; the aperture of the air hole (51-11) is 0.5 mm-7 mm;
The distance L1 between the outlet end of the fuel hole (52-1) and the central axis of the most upstream air hole (51-11) is 1 mm-10 mm; when a plurality of air holes (51-11) are coaxially arranged in a multi-ring shape along the axial direction of the nozzle main body (51), the distance L2 between the central axes of the air holes (51-11) of each two adjacent rings is 2-20 mm, and the vertical distance L3 between the central axis of the air hole (51-11) close to the other end of the nozzle main body (51) and the other end of the nozzle main body (51) is 20-120 mm; the swirl angle of the air flow is 30-60 degrees;
the length L4 of the expansion section (51-2) is 1 mm-20 mm, and the expansion angle is 30-120 degrees;
The inner diameter of the nozzle main body (51) of the micro-mixing nozzle (5) is 5 m-15 mm, and the whole length of the micro-mixing nozzle (5) is 20 mm-170 mm; the distance between the central axes of every two adjacent micro-mixing nozzles (5) is 6 mm-90 mm;
The other end of the nozzle body (51) protrudes from the end cover (4).
2. A micro-scale pure hydrogen fuel premix burner as in claim 1, wherein: when the air holes (51-11) are arranged in a multi-ring shape coaxially along the axial direction of the nozzle main body (51), the apertures of the air holes (51-11) are equal or are sequentially reduced along the direction from one end to the other end of the nozzle main body (51).
3. A micro-scale pure hydrogen fuel premix burner as in claim 1, wherein: the number of the fuel holes (52-1) is a plurality, and the fuel holes are arranged in a single ring shape or a coaxial multiple ring shape.
4. A micro-scale pure hydrogen fuel premix burner as in claim 1, wherein: the micro-mixing nozzle (5) is in threaded connection with the second nozzle mounting hole (41).
5. A micro-scale pure hydrogen fuel premix burner as in claim 1, wherein: the micro-mixing nozzles (5) are arranged in an array.
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| CN202310464297.6A CN116398880B (en) | 2023-04-27 | 2023-04-27 | Micro-scale pure hydrogen fuel premixing burner |
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| CN202310464297.6A CN116398880B (en) | 2023-04-27 | 2023-04-27 | Micro-scale pure hydrogen fuel premixing burner |
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| CN116398880A (en) | 2023-07-07 |
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