CN114941840A - Rotary flame multi-layer grading tail edge double-backflow low-nitrogen burner - Google Patents
Rotary flame multi-layer grading tail edge double-backflow low-nitrogen burner Download PDFInfo
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- CN114941840A CN114941840A CN202210555935.0A CN202210555935A CN114941840A CN 114941840 A CN114941840 A CN 114941840A CN 202210555935 A CN202210555935 A CN 202210555935A CN 114941840 A CN114941840 A CN 114941840A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 73
- 230000002093 peripheral effect Effects 0.000 claims abstract description 52
- 239000000446 fuel Substances 0.000 claims abstract description 27
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims description 48
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000000779 smoke Substances 0.000 claims description 11
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 12
- 239000003546 flue gas Substances 0.000 abstract description 11
- 239000002737 fuel gas Substances 0.000 description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008520 organization Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
-
- 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
- F23D14/48—Nozzles
-
- 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
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
-
- 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
Abstract
The invention provides a rotary flame multilayer graded tail edge double-backflow low-nitrogen burner which comprises a wind box assembly, a burner air inlet, a central fuel gun, a rotational flow flame stabilizer, a peripheral gas inlet, a gas collector, a peripheral gas gun and an ignition gun, wherein the wind box assembly is arranged at the tail edge of the burner; the air inlet of the burner is arranged on the air box assembly, and the combustion-supporting air is divided into three stages through the partition plate and enters the middle layer, the middle layer and the outer layer of the air box assembly to form three-stage air classification; the rotational flow flame stabilizer is arranged on the central fuel gun, the plurality of peripheral gas guns are arranged on the gas collector, and the gas collector is connected with the peripheral gas inlets to form central rotational flow flame; and a diffusion cone and a spoiler are arranged at the tail edge of the combustor to form tail edge double backflow. According to the invention, through the air classification of the inner layer, the middle layer and the outer layer, the central cyclone flame is coupled with the tail edge dual-backflow of the tail edge oblique flue gas backflow and the combustion-supporting air blunt body backflow, the ultralow emission of NOx and CO is realized, and the stable combustion is ensured.
Description
Technical Field
The invention relates to a rotary flame multi-layer graded tail edge double-backflow low-nitrogen burner, and belongs to the technical field of burners.
Background
As NOx emission targets become more stringent, conventional low-nitrogen combustors have been unable to meet these requirements for reducing NOx emissions. In order to realize ultralow NOx emission, a flue gas denitration mode is adopted when the high-temperature hearth heavy-load combustor such as an industrial boiler, an organic heat carrier furnace, a molten salt furnace and the like is applied, but the flue gas denitration investment cost and the operation cost are high. Therefore, a new generation of low-nitrogen gas burner needs to be developed.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the rotary flame multi-layer grading tail edge double-backflow low-nitrogen combustor is provided, the emission of NOx and CO is effectively reduced, and the combustion stability is improved.
The technical solution of the invention is as follows:
the rotary flame multi-layer graded tail edge double-backflow low-nitrogen burner comprises a wind box assembly, a burner air inlet, a central fuel gun, a rotational flow flame stabilizer, a peripheral fuel gas inlet, a fuel gas collector, a peripheral fuel gas gun and an ignition gun; the air box assembly is of a coaxial three-layer structure and comprises an air box inner cylinder, an air box middle cylinder and an air box outer cylinder; the air inlet of the combustor is arranged on the air box assembly and is divided into three parts through two layers of air inlet partition plates, wherein the upper layer of the air inlet partition plate is connected with the middle barrel of the air box, and the lower layer of the air inlet partition plate is connected with the inner barrel of the air box, so that the air box assembly is sequentially divided into a primary air area, a secondary air area and a tertiary air area from inside to outside; one end of the air box assembly connected with the hearth is a top, and the other end of the air box assembly is a bottom; the central fuel gun penetrates from the bottom of the air box assembly and is arranged in the center of the primary air area; the rotational flow flame stabilizer is arranged on the central fuel gun; the gas collector is positioned at the bottom of the air box assembly, and the peripheral gas inlet is connected with the gas collector; the peripheral gas guns are uniformly distributed on the circumference which takes the central fuel gun as the center of a circle along the inner wall of the air box inner cylinder and are connected with the gas collector, and peripheral gas spray heads are arranged on the peripheral gas guns; the ignition gun penetrates from the bottom of the air box assembly and is installed between the central fuel gun and the peripheral gas gun.
Preferably, the tail edge of the inner cylinder of the air box is provided with an inner cylinder diffusion cone, the tail edge of the middle cylinder of the air box is provided with a middle cylinder diffusion cone, and the inner cylinder diffusion cone and the middle cylinder diffusion cone are used for sucking the smoke of the hearth to form smoke backflow; and a secondary wind spoiler is installed at the outlet of the secondary wind area, and a tertiary wind spoiler is installed at the outlet of the tertiary wind area.
Preferably, the secondary wind spoiler and the tertiary wind spoiler are circumferentially distributed consistently.
Preferably, the secondary wind spoiler and the tertiary wind spoiler are of V-shaped or flat structure.
Preferably, an air inlet adjusting valve for adjusting primary air, secondary air and tertiary air is installed on the air inlet of the combustor.
Preferably, the number of the peripheral gas guns is 4-30.
Preferably, the peripheral gas nozzle is of a three-layer hole structure and comprises a first layer of spray holes, a second layer of spray holes and a third layer of spray holes.
Preferably, the included angle alpha between the injection direction of the first layer of injection holes and the axis of the peripheral gas nozzle is more than or equal to 50 degrees and less than or equal to 90 degrees; the included angle beta between the injection direction of the second layer of injection holes and the axis of the peripheral gas nozzle is more than or equal to 45 degrees and less than or equal to 60 degrees; the included angle theta between the injection direction of the third layer of injection holes and the axis of the peripheral gas nozzle is more than or equal to 60 degrees and less than or equal to 75 degrees.
Preferably, the first layer of spray holes comprise a plurality of spray holes which are uniformly distributed along the circumferential direction of the peripheral gas spray head; the second layer of spray holes and the third layer of spray holes are all single spray holes.
Preferably, the single jet holes of the second layer of jet holes and the third layer of jet holes are on the same vertical plane with one of the jet holes of the first layer of jet holes; the spraying directions of the three holes on the same vertical plane are tangent to the outer edge of the flame formed by the swirling flame stabilizer.
Compared with the prior art, the invention has the advantages that:
(1) the rotary flame multi-layer grading tail edge double-backflow low-nitrogen burner adopts air grading of an inner layer, a middle layer and an outer layer, adjusts the proportion of combustion-supporting air of each layer through the adjusting valve, accurately organizes low-nitrogen combustion, further improves the combustion stability and reduces the emission of NOx and CO;
(2) according to the rotary flame multi-layer graded tail edge double-backflow low-nitrogen combustor, a central rotary flame is formed by a plurality of peripheral gas spray guns and a central rotational flow flame stabilizer, surrounding smoke is sucked, the flame stability is ensured, and the ultralow emission of NOx and CO is realized;
(3) according to the rotary flame multi-layer graded tail edge double-backflow low-nitrogen combustor, the peripheral gas nozzle is of a three-layer porous structure, so that the uniformity of a combustion area is improved, and the stable combustion is ensured;
(4) according to the rotary flame multi-layer graded tail edge double-backflow low-nitrogen combustor, the diffusion cone and the spoilers distributed along the circumferential direction are arranged on the tail edge of the combustor to form tail edge double backflow of tail edge oblique flue gas backflow and combustion-supporting air blunt body backflow, the low-nitrogen combustion stability is improved, the NOx emission is further reduced, the sufficient combustion organization is ensured, and the CO emission is ultralow.
Drawings
FIG. 1 is a structural front view of a rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of the present invention;
FIG. 2 is a structural side view of a rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of the present invention;
FIG. 3 is a top view of a rotary flame multi-layer staged trailing edge dual-backflow low-NOx burner configuration of the present invention;
FIG. 4 is a schematic view of the peripheral gas nozzle of the rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of the present invention, wherein FIG. 4(a) is a schematic view of the arrangement of nozzles, and FIG. 4(b) is a schematic view of the angle of the nozzles;
FIG. 5 is a schematic view of the arrangement of a secondary air spoiler and a tertiary air spoiler of the rotary flame multi-layer graded trailing edge dual-backflow low-nitrogen burner of the present invention;
fig. 6 is a schematic diagram of a tail edge double-backflow principle of a rotary flame multi-layer graded tail edge double-backflow low-nitrogen burner, wherein fig. 6(a) is a schematic diagram of an oblique flue gas backflow principle, and fig. 6(b) is a schematic diagram of a combustion-supporting air bluff body backflow principle.
Detailed Description
The invention provides a rotary flame multilayer grading tail edge double-backflow low-nitrogen burner, which realizes ultralow emission of nitrogen oxides and carbon monoxide of the burner in a mode of coupling multilayer air grading, central swirl flame and tail edge double backflow.
FIG. 1 shows a preferred embodiment of a rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner provided by the invention. As shown in fig. 1, 2, and 3, the burner mainly includes: the device comprises a wind box assembly 4, a combustor air inlet 1, a central fuel gun 13, a rotational flow flame stabilizer 15, a peripheral fuel gas inlet 12, a fuel gas collector 14, a peripheral fuel gas gun 17 and an ignition gun 18; the air box assembly 4 is of a coaxial three-layer structure and comprises an air box inner cylinder 5, an air box middle cylinder 6 and an air box outer cylinder 7; the combustor air inlet 1 is arranged on the air box assembly 4, the combustor air inlet is divided into three parts by the upper layer air inlet partition plate 2 and the lower layer air inlet partition plate 2, and combustion-supporting air is divided into primary air, secondary air and tertiary air from bottom to top; wherein, the upper layer air inlet clapboard is connected with the middle barrel 6 of the air box, the lower layer air inlet clapboard is connected with the inner barrel 5 of the air box, and the air box assembly 4 is divided into a primary air area, a secondary air area and a tertiary air area from inside to outside in sequence; specifically, the inside of the inner bellows cylinder 5 and the primary air inlet constitute a primary air region, the region between the inner bellows cylinder 5 and the middle bellows cylinder 6 and the secondary air inlet constitute a secondary air region, and the region between the middle bellows cylinder 6 and the outer bellows cylinder 7 and the tertiary air inlet constitute a tertiary air region.
The structure forms a multi-stage combustion organization mode of the air of the rotary flame multi-layer graded tail edge double-backflow low-nitrogen combustor. The primary air area carries out primary combustion, fresh air and fuel gas are directly subjected to diffusion combustion and are high-point areas for generating NOx, the air volume is adjusted to be close to a rich-combustion flameout boundary, and the generated NOx is minimum. And the secondary air area appropriately supplements combustion-supporting air, so that the combustion stability is improved, the CO emission is reduced, and the rich flame combustion process can be continuously transmitted to tertiary air. The tertiary air is sprayed out and mixed with the furnace flue gas to participate in the combustion reaction, which is the key for ensuring the ultralow emission of NOx, but if the proportion is too high, the incomplete combustion and unstable combustion can be caused.
Further, an air inlet adjusting valve 3 for adjusting primary air, secondary air and tertiary air is installed on the air inlet 1 of the combustor, and the air inlet adjusting valve 3 is a manual or automatic flap valve; through the adjustment of the proportion of combustion-supporting air at each stage, low-nitrogen combustion is accurately organized, the combustion stability is further improved, and the emission of NOx and CO is reduced.
In one embodiment, natural gas is used as fuel, the primary air proportion is 20-30%, the secondary air proportion is 30-50%, and the tertiary air proportion is 20-50%.
The central fuel gun 13 penetrates from the bottom of the air box assembly 4 and is installed in the center of the primary air area, the central fuel gun 13 independently provides fuel, can be a gas gun or a fuel spray gun, and can realize fuel and gas combined low-nitrogen combustion when being a fuel spray gun; the gas proportion of the central fuel gun 13 is generally controlled to be 10-20% of the total gas quantity; a swirl flame holder 15 is mounted on the central fuel gun 13; the gas collector 14 at the bottom of the windbox assembly 4 is connected to peripheral gas inlets 12, preferably 2 peripheral gas inlets 12; a plurality of peripheral gas guns 17 are uniformly distributed along the circumferential direction of the air box inner cylinder 5, are connected with the gas collector 14 and are arranged in a primary air area; gas enters the gas collector 14 through the peripheral gas inlets 12, so that the gas can relatively uniformly enter each peripheral gas gun 17. The number of the peripheral gas guns 17 is set according to the load of the burner, and preferably, the number is 4-30; the peripheral gas gun 17 is provided with a peripheral gas spray head 18; an ignition gun 16 penetrates from the bottom of the windbox assembly 4 and is installed in the primary air area between the central fuel gun 13 and the peripheral gas guns 17. The peripheral gas nozzle 18 has a three-layer hole structure, as shown in fig. 4(a), including a first layer of holes, a second layer of holes and a third layer of holes, preferably, as shown in fig. 4(b), an included angle α between the injection direction of the first layer of injection holes and the axis of the peripheral gas nozzle is greater than or equal to 50 degrees and less than or equal to 90 degrees, and the area of the first layer of injection holes is more than 70% of the total injection hole area of the gas nozzle; the included angle beta between the injection direction of the second layer of spray holes and the axis of the peripheral gas spray head is more than or equal to 45 degrees and less than or equal to 60 degrees, and the area of the second layer of spray holes is 15-25 percent of the area of the total spray holes of the gas spray head; the included angle theta between the injection direction of the third layer of spray holes and the axis of the peripheral gas nozzle is more than or equal to 60 degrees and less than or equal to 75 degrees, and the area of the third layer of spray holes is 5-15 percent of the total spray hole area of the gas nozzle; the first layer of spray holes are uniformly distributed along the circumferential direction of the peripheral gas spray head, so that flame is uniformly distributed, and the uniformity of a combustion area is improved; the second layer of spray holes and the third layer of spray holes are single holes and are positioned on a vertical plane with one hole in the first layer of spray holes, the three spray holes are main spray areas of fuel gas, the spray angle of the three spray holes is tangential to the rotational flow flame stabilizer 15, and the spray direction of the fuel gas is consistent with the rotational direction of the rotational flow flame stabilizer 15; the third layer of spray holes have a pilot action, and stable combustion of the peripheral nozzles is guaranteed.
The central fuel lance 13 injects a small amount of fuel gas and swirls air to form a stable initial combustion zone after swirling the flame holder 15. The fuel gas and fresh air react in the initial combustion zone and are the high point of NOx formation. On the premise of ensuring the stability of the whole fuel gas, a small amount of fuel gas reacts with air to form a small high-temperature area, and the generation amount of NOx is small. Then the third layer of spray holes of the peripheral gas spray head 18 are ignited when contacting the initial combustion high-temperature area. Because a large amount of initial combustion smoke is already involved in the combustion reaction during the combustion, the NOx generation amount is obviously reduced. Then, even if the gas sprayed from the first layer and the second layer of spray holes of the peripheral gas spray head 18 contacts the third-stage nozzle for combustion reaction, the gas is difficult to directly burn due to lack of oxygen, and only a high-temperature mixture of the gas and the gas can be formed. Through the design of the injection angle and the injection area of the first layer and the second layer of spray holes, the uniformity of the spatial distribution of the fuel gas and flue gas mixture is improved as much as possible, so that the fuel gas and flue gas mixture reacts with the second air and the third air after being mixed, the combustion flame with high temperature uniformity can be formed in the radiation section area of the hearth, the continuity of combustion is ensured, secondary combustion is avoided, and the generation of CO is avoided.
The rotary flame multi-layer graded tail edge double-backflow low-nitrogen burner forms central rotary flame through the structure, generates a tornado effect, sucks surrounding smoke, and ensures flame stability and ultralow emission of NOx and CO.
An inner cylinder diffusion cone 9 is installed at the tail edge of the inner cylinder 5 of the air box, a middle cylinder diffusion cone 8 is installed at the tail edge of the middle cylinder 6 of the air box, a secondary spoiler 10 is installed at the outlet of a secondary wind area, and a tertiary spoiler 11 is installed at the outlet of a tertiary wind area. As shown in fig. 5, the secondary spoilers 10 are circumferentially distributed in accordance with the tertiary spoilers 11. The spoiler is of a blunt body structure, preferably a V-shaped or flat structure. As shown in fig. 6(a), the secondary air and the tertiary air flow through the middle barrel diffusion cone 8 and the inner barrel diffusion cone 9 to form a tail edge oblique flue gas backflow. As shown in fig. 6(b), the secondary air and the tertiary air flow through the secondary air spoiler 10 and the tertiary air spoiler 11 to form a combustion air bluff body backflow.
According to the rotary flame multi-layer graded tail edge double-backflow low-nitrogen combustor, a plurality of bluff body backflow regions are formed through a plurality of circumferentially distributed turbulence pieces arranged on the tail edge, the stability of low-nitrogen combustion is improved, meanwhile, the diffusion cone arranged on the tail edge realizes tail edge oblique smoke backflow, the mixing of tail edge combustion-supporting air and surrounding hearth smoke is further improved, tail edge dual backflow of the tail edge oblique smoke backflow and the bluff body backflow of the combustion-supporting air strengthens graded combustion, the low-nitrogen combustion stability is improved, the NOx emission is further reduced, the sufficient combustion organization is ensured, and the ultralow CO emission is realized.
The rotary flame multi-layer grading tail edge double-backflow low-nitrogen burner realizes ultralow emission of NOx and CO through multi-stage air grading and coupling of central rotary flame and tail edge double backflow, and is suitable for large-load heating application of industrial boilers, organic heat carrier furnaces, molten salt furnaces and the like at high combustion-supporting air temperature.
When the air preheating temperature is 250-300 deg.C and the fuel is natural gas, the converted value of nitrogen oxide discharge (converted to dry flue gas with oxygen content of 3.5%) on organic heat carrier boiler by using conventional burner is basically 400mg/Nm 3 The NOx conversion value can be reduced to 50mg/Nm by applying the burner of the invention 3 The conversion value of NOx emission can be less than 30mg/Nm by combining with the smoke external circulation 3 . When the fuel is high-hydrogen fuel, the NOx emission value of the conventional combustor can reach 550mg/Nm under the same condition 3 Above, the NOx emission reduced value can be realized to be less than 50mg/Nm by combining the combustor with the flue gas external circulation 3 。
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. The rotary flame multi-layer grading tail edge double-backflow low-nitrogen combustor is characterized by comprising a wind box assembly (4), a combustor air inlet (1), a central fuel gun (13), a rotational flow flame stabilizer (15), a peripheral gas inlet (12), a gas collector (14), a peripheral gas gun (17) and an ignition gun (16); the air box component (4) is of a coaxial three-layer structure and comprises an air box inner cylinder (5), an air box middle cylinder (6) and an air box outer cylinder (7); the combustor air inlet (1) is arranged on the air box assembly (4), the combustor air inlet (1) is divided into three parts through two layers of air inlet partition plates (2), wherein the upper layer of air inlet partition plate (2) is connected with an air box middle cylinder (6), the lower layer of air inlet partition plate (2) is connected with an air box inner cylinder (5), and the air box assembly (4) is sequentially divided into a primary air area, a secondary air area and a tertiary air area from inside to outside; one end of the air box assembly (4) connected with the hearth is a top, and the other end of the air box assembly is a bottom; the central fuel gun (13) penetrates from the bottom of the air box assembly (4) and is arranged in the center of the primary air area; the rotational flow flame stabilizer (15) is arranged on the central fuel gun (13); the gas collector (14) is positioned at the bottom of the air box assembly (4), and the peripheral gas inlet (12) is connected with the gas collector (14); the peripheral gas guns (17) are uniformly distributed on the circumference which takes the central fuel gun (13) as the center of a circle along the inner wall of the air box inner cylinder (5) and are connected with the gas collector (14), and peripheral gas spray heads (18) are arranged on the peripheral gas guns (17); the ignition gun (16) penetrates from the bottom of the air box assembly (4) and is arranged between the central fuel gun (13) and the peripheral gas gun (17).
2. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 1, wherein: an inner cylinder diffusion cone (9) is installed at the tail edge of the inner cylinder (5) of the air box, a middle cylinder diffusion cone (8) is installed at the tail edge of the middle cylinder (6) of the air box, and the inner cylinder diffusion cone (9) and the middle cylinder diffusion cone (8) are used for rolling and absorbing the hearth smoke to form smoke backflow; and a secondary wind spoiler (10) is installed at the outlet of the secondary wind area, and a tertiary wind spoiler (11) is installed at the outlet of the tertiary wind area.
3. The rotary flame multi-layer staged trailing edge dual backflow low NOx burner of claim 2, wherein: the secondary wind spoiler (10) and the tertiary wind spoiler (11) are circumferentially distributed consistently.
4. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 2, wherein: the secondary wind spoiler (10) and the tertiary wind spoiler (11) are of V-shaped or flat sheet structures.
5. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 1, wherein: and an air inlet adjusting valve (3) for adjusting primary air, secondary air and tertiary air is arranged on the combustor air inlet (1).
6. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 1, wherein: the number of the peripheral gas guns (17) is 4-30.
7. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 1, wherein: the peripheral gas nozzle (18) is of a three-layer hole structure and is respectively provided with a first layer of spray holes, a second layer of spray holes and a third layer of spray holes.
8. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 7, wherein: the included angle alpha between the injection direction of the first layer of injection holes and the axis of the peripheral gas nozzle (18) is more than or equal to 50 degrees and less than or equal to 90 degrees; the included angle beta between the injection direction of the second layer of injection holes and the axial line of the peripheral gas nozzle (18) is more than or equal to 45 degrees and less than or equal to 60 degrees; the included angle theta between the injection direction of the third layer of injection holes and the axial line of the peripheral gas nozzle (18) is more than or equal to 60 degrees and less than or equal to 75 degrees.
9. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 7, wherein: the first layer of spray holes comprise a plurality of spray holes which are uniformly distributed along the circumferential direction of the peripheral gas spray head (18); the second layer of spray holes and the third layer of spray holes are all single spray holes.
10. The rotary flame multi-layer staged trailing edge dual-backflow low-nitrogen burner of claim 9, wherein: the single jet holes of the second layer of jet holes and the third layer of jet holes are positioned on the same vertical plane with one jet hole of the first layer of jet holes; the spraying directions of the three holes on the same vertical plane are tangent to the outer edge of the flame formed by the swirling flame stabilizer (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210555935.0A CN114941840A (en) | 2022-05-20 | 2022-05-20 | Rotary flame multi-layer grading tail edge double-backflow low-nitrogen burner |
Applications Claiming Priority (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170276344A1 (en) * | 2014-09-02 | 2017-09-28 | Linde Aktiengesellschaft | LOW-NOx-BURNER |
| CN107559827A (en) * | 2017-09-27 | 2018-01-09 | 西安交通大学 | A kind of ultralow nitrogen gas burner |
| CN109539251A (en) * | 2018-12-14 | 2019-03-29 | 罗诺克兹（北京）能源设备技术有限公司 | A kind of super low NO |
| CN210050797U (en) * | 2019-01-30 | 2020-02-11 | 东方电气集团东方锅炉股份有限公司 | Pollutant ultra-low discharge cyclone pulverized coal burner |
| CN111237759A (en) * | 2020-02-27 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Low-nitrogen gas burner suitable for medium-low heat value fuel |
| CN112797406A (en) * | 2021-02-25 | 2021-05-14 | 佛山市金之鑫环保科技有限公司 | High-speed energy-saving environment-friendly gas burner and combustion method |
-
2022
- 2022-05-20 CN CN202210555935.0A patent/CN114941840A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170276344A1 (en) * | 2014-09-02 | 2017-09-28 | Linde Aktiengesellschaft | LOW-NOx-BURNER |
| CN107559827A (en) * | 2017-09-27 | 2018-01-09 | 西安交通大学 | A kind of ultralow nitrogen gas burner |
| CN109539251A (en) * | 2018-12-14 | 2019-03-29 | 罗诺克兹（北京）能源设备技术有限公司 | A kind of super low NO |
| CN210050797U (en) * | 2019-01-30 | 2020-02-11 | 东方电气集团东方锅炉股份有限公司 | Pollutant ultra-low discharge cyclone pulverized coal burner |
| CN111237759A (en) * | 2020-02-27 | 2020-06-05 | 西安西热锅炉环保工程有限公司 | Low-nitrogen gas burner suitable for medium-low heat value fuel |
| CN112797406A (en) * | 2021-02-25 | 2021-05-14 | 佛山市金之鑫环保科技有限公司 | High-speed energy-saving environment-friendly gas burner and combustion method |
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