CN217423252U - Premixer for lean premixed burner - Google Patents
Premixer for lean premixed burner Download PDFInfo
- Publication number
- CN217423252U CN217423252U CN202221613523.XU CN202221613523U CN217423252U CN 217423252 U CN217423252 U CN 217423252U CN 202221613523 U CN202221613523 U CN 202221613523U CN 217423252 U CN217423252 U CN 217423252U
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- China
- Prior art keywords
- blading
- gas
- premixer
- necking
- nozzle
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- 238000002955 isolation Methods 0.000 claims description 29
- 239000007921 spray Substances 0.000 claims description 9
- 239000011229 interlayer Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 56
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000003546 flue gas Substances 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 9
- 125000006850 spacer group Chemical group 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000002737 fuel gas Substances 0.000 description 10
- 239000003595 mist Substances 0.000 description 8
- 238000009987 spinning Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- 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
- Gas Burners (AREA)
Abstract
The utility model discloses a premixer for lean burn premix combustor, which comprises a body, the body includes that outer tube and cover locate the inside spacer tube of outer tube, the intermediate layer between spacer tube and the outer tube constitutes the premix channel, the both ends of premix channel are first throat and second throat respectively, first throat department is equipped with the nozzle, mixes inside whirl blading and the direct current blading of being equipped with of channel in advance, whirl blading is located between direct current blading and the nozzle. The utility model discloses a set up whirl blading and direct current blading in premixing the passageway, gas and combustion-supporting gas pass through whirl blading intensive mixing earlier, then control the gas flow direction through direct current blading, do benefit to the backward flow that produces the flue gas, through setting up first throat, are favorable to combustion-supporting gas to get into premixing the passageway, are convenient for enlarge flame diameter through setting up the second throat, reduce the exit velocity of flow, prevent to take off a fire.
Description
Technical Field
The utility model belongs to the combustor field, concretely relates to a premix ware that is used for lean burn to mix the combustor in advance.
Background
The burner is a general term for a device for ejecting fuel and air in a certain manner to perform mixed combustion. The burners are classified into industrial burners, civil burners and special burners according to types and application fields.
As the national environmental protection policy becomes stricter and stricter, the requirement on the emission of nitrogen oxides of boilers is higher and higher. For combustion of gas, the mechanism of NOx formation is primarily of the thermodynamic type, i.e., when the flame temperature is high enough, N destruction occurs 2 Covalent bonds giving free N ions, combined with oxygen atoms to form NO x 。
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a premix ware for lean burn premix combustor, through the structure that changes premix ware, both can reduce the tempering risk, thereby greatly reduce combustion temperature again and reach the formation that suppresses NOx.
In order to solve the above problems existing in the prior art, the utility model discloses the technical scheme who adopts is:
a premixer for a lean-burn premixing burner comprises a body, wherein the body comprises an outer pipe and an isolating pipe sleeved inside the outer pipe, and an interlayer between the isolating pipe and the outer pipe forms a premixing channel.
The two ends of the premixing channel are respectively provided with a first necking and a second necking, the first necking is provided with a nozzle, a rotational flow blade group and a direct current blade group are arranged in the premixing channel, and the rotational flow blade group is arranged between the direct current blade group and the nozzle.
Through setting up whirl blading and direct current blading at the premix passageway, gas and combustion-supporting gas are earlier through whirl blading intensive mixing, then control the gas flow direction through direct current blading, do benefit to the backward flow that produces the flue gas.
Through setting up first throat, be favorable to combustion-supporting gas to get into and mix the passageway in advance, be convenient for enlarge flame diameter through setting up the second throat, reduce the export velocity of flow, prevent to take off a fire.
Furthermore, outer tube and isolation tube coaxial arrangement, the isolation tube is the closed tube, and the one end that the isolation tube is close to first throat is the blind end, first throat is the air inlet, the outer tube of first throat department is diameter-changing structure, and the one end that the second throat was kept away from to first throat is great.
Further, outer tube and spacer tube are the integral type structure, and wherein the mouth of pipe of one end enlarges the outer tube, makes it become the reducing pipe to the space of the first throat of increase, the air input is bigger, the bore of air inlet is followed gas flow direction by big to little, because the space diminishes, the velocity of flow of gas accelerates, improves mixing efficiency.
Further, the second throat is the gas outlet, and the isolation pipe of second throat department is diameter-changing structure, and the one end that first throat was kept away from to the second throat is great, reduces the mouth of pipe of isolation pipe one end wherein, makes it become the reducing pipe, because the isolation pipe is inside, when the diameter of isolation pipe reduces, the space increase of second throat slows down the gas flow rate, the bore of gas outlet is followed gas flow direction by little to big, because the space grow, the gas flow rate slows down for the burning is more abundant.
Further, the whirl blade group includes a plurality of spinning disks, and a plurality of spinning disks use the axis of barrier tube to be central symmetry distribution as the center, set gradually a plurality of spinning disks according to the order for the mist passes through behind the spinning disk along a direction flow, when can improve gas mixing efficiency, still can not form the sinuous flow.
Further, direct current blade group includes a plurality of straight blades, and a plurality of straight blades use the axis of isolation pipe to be central symmetry distribution as the center, through setting up a plurality of straight blades for mist can flow along the linearity when flowing, generates direct current flame at the exit, does benefit to the backward flow that produces the flue gas.
Furthermore, the nozzle is provided with a plurality of spray holes, the plurality of spray holes are distributed in a central symmetry mode by taking the axis of the nozzle as the center, the axis of each spray hole is intersected with the axis of the isolation pipe, the flowing directions of fuel gas sprayed out of the spray holes and combustion-supporting gas are different by controlling the direction of each spray hole, the fuel gas and the combustion-supporting gas can be mixed more uniformly, the spray holes are reversely sprayed to the upstream of the premixing channel, and the improvement of the mixing effect of the fuel gas and the combustion-supporting gas is facilitated.
The utility model has the advantages that: the fuel gas and the excess air are premixed in the long interlayer channel, so that the tempering risk can be effectively reduced, and the combustion temperature is greatly reduced, thereby inhibiting NO x Can provide a maximum turndown ratio of 10: 1.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 1;
FIG. 4 is a flow chart of the flue gas and the fuel gas of the present invention;
fig. 5 is a schematic view of the present invention.
In the figure: 120-a body; 121-an outer tube; 122-an isolation tube; 123-straight blade; 124-a spinning disk; 125-a nozzle; 1251-spraying holes; 126-second constriction; 127-a first constriction; 128-premix passage.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and reference numerals.
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
Example 1:
as shown in fig. 1 and 2, a premixer for a lean premixed burner includes a body 120, the body 120 includes an outer tube 121 and an isolation tube 122 sleeved inside the outer tube 121, and an interlayer between the isolation tube 122 and the outer tube 121 forms a premixing passage 128.
The two ends of the premixing channel 128 are respectively provided with a first reducing opening 127 and a second reducing opening 126, the first reducing opening 127 is provided with a nozzle 125, a swirl blade group and a direct-current blade group are arranged in the premixing channel 128, and the swirl blade group is arranged between the direct-current blade group and the nozzle 125.
By providing the swirl vane assembly and the dc vane assembly in the premixing passage 128, the fuel gas and the combustion-supporting gas are fully mixed by the swirl vane assembly, and then the flow direction of the gas is controlled by the dc vane assembly, thereby facilitating the generation of the backflow of the flue gas.
The first necking 127 is arranged to facilitate the combustion-supporting gas to enter the premixing channel 128, and the second necking 126 is arranged to facilitate the expansion of the flame diameter, reduce the outlet flow speed and prevent fire from escaping.
During the use, the gas is spout through nozzle 125, then gets into premix channel 128 with combustion-supporting gas together, gas and combustion-supporting gas pass through the whirl blading, because the crooked setting of whirl blading, gas is the heliciform after passing through the whirl blading and rises, and gas and combustion-supporting gas can the intensive mixing even this moment, pass through the direct current blading after the misce bene for the mist can flow along the axis direction of body 120, generates direct current flame at premix channel 128 exit (second throat 126), does benefit to the backward flow that produces the flue gas.
Example 2:
as shown in fig. 1 to 5, a premixer for a lean premixed burner includes a body 120, the body 120 includes an outer tube 121 and an isolation tube 122 sleeved inside the outer tube 121, and a sandwich layer between the isolation tube 122 and the outer tube 121 forms a premixing passage 128.
The two ends of the premixing channel 128 are respectively provided with a first reducing opening 127 and a second reducing opening 126, the first reducing opening 127 is provided with a nozzle 125, a swirl blade group and a direct-current blade group are arranged in the premixing channel 128, and the swirl blade group is arranged between the direct-current blade group and the nozzle 125.
By arranging the swirl vane set and the direct-flow vane set in the premixing passage 128, the fuel gas and the combustion-supporting gas are fully mixed through the swirl vane set, and then the gas flow direction is controlled through the direct-flow vane set, so that the backflow of the flue gas is favorably generated.
The first reducing opening 127 is arranged to facilitate the combustion-supporting gas to enter the premixing channel 128, and the second reducing opening 126 is arranged to facilitate the expansion of the flame diameter, reduce the flow rate of the outlet gas and prevent the fire from escaping.
During the use, the gas is spout through nozzle 125, then gets into premix channel 128 with combustion-supporting gas together, gas and combustion-supporting gas pass through the whirl blading, because the crooked setting of whirl blading, gas is the heliciform after passing through the whirl blading and rises, and gas and combustion-supporting gas can the intensive mixing even this moment, pass through the direct current blading after the misce bene for the mist can flow along the axis direction of body 120, generates direct current flame at premix channel 128 exit (second throat 126), does benefit to the backward flow that produces the flue gas.
The outer tube 121 and the isolation tube 122 are coaxially arranged, the isolation tube 122 is a closed tube, and one end of the isolation tube 122 close to the first necking 127 is a closed end.
The first reducing opening 127 is an air inlet, the outer pipe 121 at the first reducing opening 127 is of a reducing structure, and one end of the first reducing opening 127 far away from the second reducing opening 126 is larger.
The outer pipe 121 and the isolation pipe 122 are both of an integrated structure, and a pipe orifice at one end of the outer pipe 121 is enlarged to form a reducer pipe, so that the space of the first reducing opening 127 is enlarged, and the air inflow is larger.
The caliber of the air inlet is gradually reduced along the flowing direction of the air, and the flowing speed of the air is accelerated due to the reduction of the space, so that the mixing efficiency is improved.
The second reducing port 126 is an air outlet, the isolation tube 122 at the second reducing port 126 is of a reducing structure, and one end of the second reducing port 126, which is far away from the first reducing port 127, is larger.
The orifice of one end of the isolation tube 122 is reduced to form a reducer tube, and since the isolation tube 122 is inside, when the diameter of the isolation tube 122 is reduced, the space of the second reducing orifice 126 is increased, and the gas flow rate is reduced.
The caliber of the gas outlet is gradually increased along the gas flowing direction, and the gas flow speed is reduced due to the increased space, so that the combustion is more sufficient.
The swirl vane assembly includes a plurality of swirl vanes 124, and the plurality of swirl vanes 124 are distributed in a central symmetrical manner with the axis of the isolation tube 122 as the center.
Set gradually a plurality of spinning disks 124 in order for the mist flows along a direction after passing through spinning disk 124, when can improving gas mixing efficiency, still can not form the sinuous flow.
The direct-current blade group includes a plurality of straight blades 123, and the plurality of straight blades 123 are distributed in a central symmetry manner with the axis of the isolation pipe 122 as a center.
Through setting up a plurality of straight blade 123 for the mist can be along the linearity flow when flowing out, generates direct current flame at the exit, does benefit to the backward flow that produces the flue gas.
The nozzle 125 is provided with a plurality of nozzle holes 1251, and the plurality of nozzle holes 1251 are arranged to be centrosymmetric with respect to the axis of the nozzle 125.
The axis of the injection hole 1251 intersects with the axis of the isolation tube 122.
By controlling the direction of the nozzle holes 1251, the flowing directions of the fuel gas sprayed from the nozzle holes 1251 and the combustion-supporting gas are different, and the fuel gas and the combustion-supporting gas can be mixed more uniformly.
The jet holes 1251 are reversely sprayed to the upstream of the premixing channel 128, which is beneficial to improving the mixing effect of the fuel gas and the combustion-supporting gas.
The specific working principle is as follows:
during the use, the gas is through the spout 125 blowout, then with combustion-supporting gas entering premix channel 128 together, gas and combustion-supporting gas pass through the whirl blading, because the crooked setting of spinning disk 124, gas is the heliciform after passing through the whirl blading and rises, gas and combustion-supporting gas can the intensive mixing at this moment, pass through the direct current blading behind the misce bene, direct blade 124 is through spacing to the mist flow direction, make mist can flow along the axis direction of body 120, generate direct current flame in premix channel 128 exit (second throat 126), do benefit to the backward flow that produces the flue gas.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (7)
1. A premixer for a lean premixed burner, comprising a body (120), said body (120) comprising an outer tube (121) and an isolation tube (122) nested inside the outer tube (121), characterized in that: the interlayer between the isolating pipe (122) and the outer pipe (121) forms a premixing channel (128);
the two ends of the premixing channel (128) are respectively provided with a first reducing opening (127) and a second reducing opening (126), the first reducing opening (127) is provided with a nozzle (125), a swirl blade group and a direct-current blade group are arranged in the premixing channel (128), and the swirl blade group is arranged between the direct-current blade group and the nozzle (125).
2. The premixer for a lean premixed combustor according to claim 1, wherein: the first necking (127) is an air inlet, the outer pipe (121) at the first necking (127) is of a reducing structure, and one end, far away from the second necking (126), of the first necking (127) is larger.
3. The premixer for a lean premixed combustor according to claim 2, characterized in that: the second necking (126) is an air outlet, the isolating pipe (122) at the second necking (126) is of a reducing structure, and one end, far away from the first necking (127), of the second necking (126) is larger.
4. The premixer for a lean premixed combustor according to claim 1, wherein: the swirl vane group comprises a plurality of swirl vanes (124), and the plurality of swirl vanes (124) are distributed in a central symmetry manner by taking the axis of the isolation pipe (122) as the center.
5. The premixer for a lean premixed combustor according to claim 1, characterized in that: the direct current blade group comprises a plurality of straight blades (123), and the straight blades (123) are distributed in a centrosymmetric mode by taking the axis of the isolation pipe (122) as the center.
6. The premixer for a lean premixed combustor according to claim 1, characterized in that: the nozzle (125) is provided with a plurality of spray holes (1251), and the spray holes (1251) are distributed in a central symmetry mode by taking the axis of the nozzle (125) as the center.
7. The premixer for a lean premixed combustor according to claim 6, wherein: the axis of the spray hole (1251) is intersected with the axis of the isolation pipe (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221613523.XU CN217423252U (en) | 2022-06-23 | 2022-06-23 | Premixer for lean premixed burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221613523.XU CN217423252U (en) | 2022-06-23 | 2022-06-23 | Premixer for lean premixed burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217423252U true CN217423252U (en) | 2022-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221613523.XU Active CN217423252U (en) | 2022-06-23 | 2022-06-23 | Premixer for lean premixed burner |
Country Status (1)
| Country | Link |
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| CN (1) | CN217423252U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697405A (en) * | 2023-05-31 | 2023-09-05 | 中国航发燃气轮机有限公司 | Premixing rotational flow micro-mixing nozzle and combustion chamber |
-
2022
- 2022-06-23 CN CN202221613523.XU patent/CN217423252U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697405A (en) * | 2023-05-31 | 2023-09-05 | 中国航发燃气轮机有限公司 | Premixing rotational flow micro-mixing nozzle and combustion chamber |
| CN116697405B (en) * | 2023-05-31 | 2024-01-19 | 中国航发燃气轮机有限公司 | Premixing rotational flow micro-mixing nozzle and combustion chamber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231204 Address after: No. 20-1 Hefeng Road, Daqing High tech Zone, Daqing City, Heilongjiang Province, 163316 Patentee after: Daqing Jiayuntong Petroleum Equipment Development Co.,Ltd. Address before: Room 4601, building T2, Shenye Shangcheng (South District), 5001 Huanggang Road, Lianhua Yicun community, Huafu street, Futian District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN JIAYUNTONG ELECTRONICS Co.,Ltd. |
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| TR01 | Transfer of patent right |