CN111271707A - Center ultra-mixing low-nitrogen internal reflux gas burner - Google Patents
Center ultra-mixing low-nitrogen internal reflux gas burner Download PDFInfo
- Publication number
- CN111271707A CN111271707A CN202010153766.9A CN202010153766A CN111271707A CN 111271707 A CN111271707 A CN 111271707A CN 202010153766 A CN202010153766 A CN 202010153766A CN 111271707 A CN111271707 A CN 111271707A
- Authority
- CN
- China
- Prior art keywords
- air
- pipe
- gas
- premixing
- air outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- 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
- F23D14/60—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
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
Abstract
The patent provides a center that nitrogen oxide emission concentration is lower surpasss mixes low nitrogen internal reflux gas combustion ware. The air outlet pipe is communicated with an air channel in the shell; the front end of the central air pipe is provided with a central air tap; the outer annular air pipes are positioned on the periphery of the air outlet pipe, and a smoke suction gap is formed between the front ends of the outer annular air pipes and the rear ends of the air suction mixing pipes; the front end of the premixing air pipe is connected with a premixing air nozzle, and the periphery of the central air nozzle is provided with the premixing air nozzle. The central air pipe, the premixed air pipe and the outer annular air pipe are all communicated with a gas source; the premixed air pipe is communicated with an air source; the air entering the premixing air pipe is mixed with the fuel gas entering the premixing air pipe and then is sprayed out through the premixing air nozzle for combustion; when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted.
Description
Technical Field
This patent relates to a low nitrogen internal reflux gas burner.
Background
At present, most low-nitrogen combustors with low emission of 30mg adopt the FGR flue gas circulation technology, 15-25% of flue gas is supplied to the combustion process, so that the flame temperature is reduced, and the low-nitrogen combustors with low emission adopt the FGR flue gas circulation technologyThis reduction of NOXThe value is obtained. The flue gas at the tail part of the boiler is introduced into the whole air inlet path through the fan, the flue gas is put into the combustor again for combustion, the surface temperature of the flame is reduced, the increased flue gas can absorb the temperature of the flame, and because 15-25% of the flue gas is put into the combustor in a large proportion, the heat efficiency of the boiler is affected, and the energy consumption is increased.
Chinese patent with application number CN2020100721034 discloses a backflow gas burner in low nitrogen furnace, which adopts an ejection air backflow technology, a fan ejects combustion-supporting air through an air outlet pipe, a strong flue gas backflow is formed in a combustion chamber, low-temperature flue gas around a rolling suction furnace wall participates in combustion, the overall distribution of flame is changed, the combustion temperature is reduced, and NO is reducedXWhile the flue gas is added to cool the flame outer flame temperature, which will reduce the generation of NO from oxygen and nitrogenXThe process of (2), evenly reduce the temperature peak value of flame, adopt drainage air cock backward flow technique simultaneously, the gas flows from the outer loop air cock under certain pressure, enters into the mixing tube of breathing in, relies on the pressure of gas to breathe in mixing tube air all around, the flue gas gets into the mixing tube of breathing in, through mixing to breathe in and close the anterior outflow of pipe and burn, because gas and air, flue gas premix, the temperature of flame is even, has shortened the time that the gas stayed in the high temperature district, combustion temperature greatly reduced. But the flame is still not very uniform in overall distribution, the local combustion temperature is still high, NOXThere is still room for a drop.
Disclosure of Invention
The purpose of this patent is to provide a center that nitrogen oxide emission concentration is lower surpasses mixes low nitrogen internal reflux gas combustion ware.
The central ultra-mixing low-nitrogen internal reflux gas burner comprises a central air pipe, an outer air pipe, a shell with an air channel inside and a pre-mixing air pipe, wherein the inlet of the air channel is communicated with the outlet of a fan, and an air outlet pipe is communicated with the air channel; the front end of the central air pipe is provided with a central air tap and is positioned in the central part of the air outlet pipe, the air outlet pipe comprises a front section air outlet pipe and a conical rear section air outlet pipe with a small front part and a large rear part, and the front part of the front section air outlet pipe is an opening expanding section with a large front part and a small rear part; the front end of the rear section air outlet pipe is smaller in diameter, and a flue gas backflow gap is formed between the front end of the front section air outlet pipe with the larger diameter and the rear end of the rear section air outlet pipe; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas backflow gap to be mixed with the combustion-supporting air and then participate in combustion; the outer annular air pipes are positioned at the periphery of the air outlet pipe; the front end of the outer annular air pipe is opposite to the rear end of the air suction mixing pipe with the diameter larger than that of the outer annular air pipe, and a flue gas suction gap is formed between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe; the front end of the premixing air pipe is connected with a premixing air nozzle, and the periphery of the central air nozzle is provided with the premixing air nozzle.
The central air pipe and the outer annular air pipe are communicated with a fuel gas source through air supply pipelines, and each air supply pipeline is provided with an adjusting valve;
when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted.
In the center ultra-mixing low-nitrogen internal reflux gas burner, the premixing air pipe is communicated with the premixing air pipe through the venturi pipe. The premixing air pipe is connected with a tee joint, one inlet of the tee joint is connected with a venturi tube, the other end of the venturi tube is communicated with the premixing air pipe, and the other inlet of the tee joint is communicated with an air supply pipeline.
The central ultra-mixed low-nitrogen internal reflux gas burner also comprises an inner cylinder positioned in the air outlet pipe, the inner cylinder divides the inner space of the air outlet pipe into an internal air outlet channel and an external air outlet channel, and the front end of the central air pipe and the central air tap are positioned in the internal air outlet channel; in the axial direction of the air outlet pipe, the front end of the inner cylinder is positioned at the rear part of the flaring section.
In the central ultra-mixing low-nitrogen internal reflux gas burner, the front end of the outer air pipe is connected with the rear end of the air suction mixing pipe through the second blades extending in the radial direction; the rear part of the outer air pipe extends into the air distribution pipe and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe penetrates through the shell and is communicated with an air distribution cavity in the annular air distribution disc; the gas distribution plate is provided with a rotatable adjusting nut, the inner periphery of the adjusting nut is connected with an adjusting rod through threads, and the adjusting rod penetrates through the gas distribution plate and extends into the gas distribution pipe so as to be connected with the outer annular gas pipe through a first blade extending in the radial direction; the adjusting nut, the adjusting rod, the outer annular air pipe and the air suction mixing pipe are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to axially move; the gas distribution cavity in the gas distribution disc is communicated with a gas source through a gas supply pipeline; the gas enters the gas distribution cavity through the gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe. Adopt spare parts such as adjusting nut, distribution pipe, second blade, first blade to constitute the mixing pipe axial adjustment mechanism of breathing in, can rotate adjusting nut and can adjust the axial position of mixing pipe of breathing in under the prerequisite of guaranteeing air and gas isolation, and then adjust flame length.
In the above central super-mixing low-nitrogen internal reflux gas burner, the front end surface of the air suction mixing pipe is an inclined surface back to the axis of the air outlet pipe. Therefore, the smoke can better flow back to the rear end of the suction mixing pipe.
The beneficial effect of this patent: this patent adopts and draws and penetrates wind backward flow technique, the fan passes through the play tuber pipe blowout of special construction with combustion-supporting wind, form a powerful flue gas backward flow in the furnace of burning, the book inhales oven low temperature flue gas all around and goes in participating in the burning, partly low temperature flue gas is through participating in the burning after being inhaled in the air-out pipe and mixing with combustion-supporting wind through flue gas backward flow clearance, another part low temperature flue gas is through being inhaled in the air-out pipe through the flue gas entry and participating in the burning after mixing with combustion-supporting wind, just so change flame global distribution, reduce the temperature of burning, NO is reducedXWhile the flue gas is added to cool the flame outer flame temperature, which will reduce the generation of NO from oxygen and nitrogenXThereby reducing NOXThe temperature peak value of the flame is uniformly reduced. Meanwhile, a drainage air nozzle backflow technology is adopted, fuel gas flows out from an outer ring air nozzle under certain pressure and enters an air suction mixing pipe, air and smoke around the air suction mixing pipe enter the air suction mixing pipe by means of the pressure of the fuel gas and flow out from the front part of the air mixing pipe to be combusted, and because the fuel gas, the air and the smoke are premixed, the temperature of flame is uniform, the residence time of the fuel gas in a high-temperature area is shortened, and the combustion temperature is greatly reduced; the premixed air and the premixed gas are fully mixed and then are sprayed out through the premixing air nozzle, and because the fuel and the air are premixed in advance, the temperature of flame is uniform, and the stay of the gas in a high-temperature area is shortenedTime of combustion, greatly reduced combustion temperature, reduced NOXGenerating; the premixed air forms high-speed airflow through the premixed air pipe and the Venturi tube and enters the premixed air pipe to form super mixing with the fuel gas entering the premixed air pipe through the air supply pipeline, the uniformity is better, and the combustion temperature and NO can be reducedXGenerating; the periphery of the central air nozzle is provided with the pre-mixing air nozzle, and the periphery of the pre-mixing air nozzle is provided with the outer ring air nozzle, so that the combustion is basically uniform on the whole cross section of the hearth, the uniformity of a temperature field is good while the combustion temperature is reduced, and NO is generatedXLess.
The central gas of patent is by central air cock blowout, adopts the diffusion formula burning, and is small, compact structure, can not temper, and flame is stable to guaranteed that whole burning is stable.
In a word, the nitrogen oxide in the exhausted tail gas reaches 27mg/m by adopting a drainage air nozzle backflow technology, an ejection air backflow technology, a Venturi effect and the like3The method and the device have the advantages that the air inlet flow is adjusted in real time by adopting the prior art such as an adjusting valve and the like, so that the purposes of intelligent control, simplicity in operation, convenience in maintenance, long service life of parts, low energy consumption, energy conservation, low nitrogen emission and the like are achieved.
Drawings
FIG. 1 is a perspective view of a central ultra-mixed low nitrogen internal reflux gas burner;
FIG. 2 is a front view of the center super mixed low nitrogen internal return gas burner in an installed condition;
FIG. 3 is a perspective view of the air outlet pipe, the outer air outlet pipe, etc.;
FIG. 4 is a perspective view of a premix air circuit, a premix gas circuit, etc.;
FIG. 5 is a schematic view of an adjustment lever, outer collar, etc.;
FIG. 6 is a schematic illustration of a premix air tube, premix air nozzle, etc.;
fig. 7 is a perspective view of the inner tube, the premixed gas pipe, and the like.
In the figure, a central air pipe 1, an outer annular air pipe 2, a dust cover 29, an air channel 3, an air quantity regulating valve 30, a shell 4, an air outlet pipe 5, a front section air outlet pipe 51, a conical rear section air outlet pipe 52, a flue gas reflux gap 53, a middle section air outlet pipe 54 and a flue gas inlet 55;
the central air tap 6, the inner cylinder 7, the inner air outlet channel 71 and the outer air outlet channel 72;
the gas suction mixing pipe 8, the inclined plane 81, the second blades 9 are connected, the flue gas suction gap 10, the gas distribution pipe 11, the annular gas distribution disc 12, the gas distribution cavity 121, the adjusting nut 13, the adjusting rod 14, the first blades 15, the outer ring gas supply pipeline 16 and the central gas supply pipeline 17 are arranged in the gas distribution cavity;
the system comprises a premixing air pipe 18, a premixing air nozzle 19, an adjusting pull rod 20, a tee joint 21, a venturi tube 211, a flexible premixing air pipe 22, a premixing air loop 23, a flexible premixing gas pipe 24, a premixing gas loop 25, a premixing air supply pipeline 26 and a premixing gas supply pipeline 27.
Detailed Description
Referring to fig. 1, the central ultra-mixing low-nitrogen internal reflux gas burner includes a central air pipe 1, an outer air pipe 2, a pre-mixing air pipe 18, and a housing 4 having an air passage 3 therein, wherein an inlet of the air passage is provided with an air volume adjusting valve 30 and is communicated with an outlet of a fan (not shown), and an air outlet pipe 5 is communicated with the air outlet pipe. The inner cylinder 7 in the air outlet pipe divides the inner space of the air outlet pipe into an inner air outlet channel 71 and an outer air outlet channel 72 which are communicated with the air channel.
The air outlet pipe 5 comprises a front section air outlet pipe 51, a middle section air outlet pipe 54 and a tapered rear section air outlet pipe 52 with a small front part and a large rear part, and the front section air outlet pipe 51 is an opening expanding section with a large front part and a small rear part; the front end of the cylindrical middle air outlet pipe 54 is butted with the flaring section, the front end of the rear air outlet pipe 52 has smaller diameter, and a flue gas backflow gap 53 is formed between the front end of the middle air outlet pipe with larger diameter and the rear end of the middle air outlet pipe. The side wall of the front part of the middle section air outlet pipe 54 is provided with a plurality of flue gas inlets 55; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas inlet 55 to be mixed with the combustion-supporting air and then participate in combustion.
The premixing air pipe 18 is arranged between the periphery of the inner cylinder 7 and the inner side wall of the air outlet pipe, and the front end of the premixing air pipe is provided with a premixing air nozzle 19. The premix air tube extends rearwardly through the air passage 3 into the housing 4, with its rear end closed; the closed rear end of which is connected to an adjusting lever 20, which adjusting lever 20 is arranged on the housing 4 so as to be axially displaceable.
The back section of the pre-mixing air pipe 18 is connected with a tee 21, one inlet of the tee 21 is connected with a venturi tube 211, the other end of the venturi tube 211 is communicated with a pre-mixing air loop 23 arranged on the shell 4 (or the shell 4 and the pre-mixing air loop 23 are of an integral structure) through a flexible pre-mixing air pipe 22, and the pre-mixing air loop 23 is communicated with an air source through a pre-mixing air supply pipeline. The other inlet of the tee joint 21 is communicated with a premixed gas loop 25 arranged in the air channel through a flexible premixed gas pipe 24, and the premixed gas loop 25 is communicated with a gas source through a premixed gas supply pipeline 27. The premix air supply line 26 and the premix gas supply line 27 are provided with control valves. Premixed air enters the premixed air loop 23 through the premixed air supply pipeline 26, then the flexible premixed air pipe 22, the venturi tube 211 and the tee joint 21 enter the premixed air pipe 18, premixed gas entering the tee joint through the premixed gas supply pipeline 27, the premixed gas loop 25 and the flexible premixed gas pipe 24 is adsorbed under the venturi effect, and the premixed gas enters the premixed air pipe 18 after being super-mixed.
When the combustion-supporting air is sprayed out through the air channel and the air outlet pipe 5, the flue gas on the periphery of the air outlet pipe is sucked into the air outlet channel 72 through the flue gas backflow gap and the flue gas inlet to be mixed with the combustion-supporting air and then participate in combustion.
In the axial direction of the air outlet pipe, the front end of the inner cylinder is positioned at the rear part of the flaring section.
The front end of the central air pipe 1 is provided with a frustum-shaped central air nozzle 6, the side wall of the frustum is provided with an air outlet, the front part of the central air pipe is positioned in an inner air outlet channel 71 inside the inner cylinder 7, the peripheral part of the central air pipe close to the frustum-shaped central air nozzle 6 is provided with a diffusion disc 73, and the diffusion disc 73 is provided with a plurality of blades.
The outer annular air pipes 2 are positioned at the periphery of the air outlet pipe 5; the front end of the outer annular duct 2 is axially opposite to the rear end of a suction mixing duct 8 of larger diameter than the latter and is connected by second vanes 9 extending in the radial direction. A smoke suction gap 10 is arranged between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe; when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap 10 to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted. The front end surface of the air suction mixing pipe 8 is an inclined surface 81 back to the axis of the air outlet pipe.
The rear part of the outer air distribution pipe extends into the air distribution pipe 11 and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe 11 penetrates through the shell 4 and is communicated with an air distribution cavity 121 in the annular air distribution disc 12; the gas distribution plate 12 is provided with a rotatable adjusting nut 13 and a detachable dust cover 29 covering the adjusting nut, the inner periphery of the adjusting nut is connected with the adjusting rod 14 through threads, the adjusting rod 14 penetrates through the gas distribution plate 12 to extend into the gas distribution pipe 11, and the adjusting rod is connected with the rear end of the outer gas distribution pipe through a first blade 15 extending in the radial direction.
The adjusting nut 13, the adjusting rod 14, the outer annular air pipe 2 and the air suction mixing pipe 8 are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to move axially; the gas distribution cavity 121 in the gas distribution disc 12 is communicated with a gas source through an outer ring gas supply pipeline 16; the gas enters the gas distribution cavity through the outer ring gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe.
The central gas pipe is communicated with a gas source through a central gas supply pipeline 17. The outer ring gas supply pipeline 16 and the central gas supply pipeline 17 which are connected in parallel are both provided with regulating valves.
The contents of the present application can be referred to chinese patent application No. CN 2020100721034.
The gas that gets into in the low nitrogen gas combustor burns and gives out heat and heats equipment such as boiler, adopts and draws and penetrates wind backward flow technique, and high pressure fan passes through the tuber pipe blowout with combustion-supporting wind, forms a powerful flue gas backward flow in the furnace of burning, and the roll is inhaled low temperature flue gas all around and is participated in the burning and go, changes flame overall distribution, reduces the temperature of burning, has reduced NOXWhile the flue gas is added to cool the flame outer flame temperature, which will reduce the generation of NO from oxygen and nitrogenXThereby reducing NOXThe temperature peak value of the flame is uniformly reduced. Meanwhile, the drainage air nozzle technology is adopted, the gas flows out from the air nozzle under certain pressure, enters the air suction mixing pipe, and simultaneously, the air and the smoke around the air suction mixing pipe are sucked by the pressure of the gas
The gas enters the gas suction mixing pipe and flows out from the front part of the gas suction mixing pipe for combustion, and because the gas, the air and the flue gas are premixed, the temperature of flame is uniform, and the combustion temperature is greatly reduced; the residence time of the fuel gas in the high-temperature area is shortened.
Claims (9)
1. The central ultra-mixing low-nitrogen internal reflux gas burner comprises a central air pipe, an outer air pipe and a shell with an air channel inside, wherein the inlet of the air channel is communicated with the outlet of a fan, and an air outlet pipe is communicated with the air channel; the central trachea front end is provided with central air cock and is located out tuber pipe central part, characterized by: the air outlet pipe comprises a front section, a middle section and a conical rear section with a small front part and a large rear part, and the front section air outlet pipe is an opening expanding section with a large front part and a small rear part; the middle air outlet pipe is cylindrical; the front end of the rear section air outlet pipe is smaller in diameter, and a flue gas backflow gap is formed between the front end of the rear section air outlet pipe and the rear end of the middle section air outlet pipe with the larger diameter; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas backflow gap to be mixed with the combustion-supporting air and then participate in combustion; the outer annular air pipes are positioned at the periphery of the air outlet pipe; the front end of the outer annular air pipe is opposite to the rear end of the air suction mixing pipe with the diameter larger than that of the outer annular air pipe, and a flue gas suction gap is formed between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe; the plurality of premixing air pipes are positioned between the periphery of the central air pipe and the inner side wall of the air outlet pipe, and the front ends of the premixing air pipes are provided with premixing air nozzles;
the central air pipe, the premixed air pipe and the outer annular air pipe are communicated with a gas source through air supply pipelines, and each air supply pipeline is provided with an adjusting valve; the premixing air pipe is also communicated with an air source for providing air to the premixing air pipe through the premixing air pipe; the air entering the premixing air pipe through the premixing air pipe is mixed with the gas entering the premixing air pipe through the gas supply pipeline, and then the mixed gas is sprayed out through the premixing air nozzle for combustion;
when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted.
2. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: the premixing air pipe is communicated with the premixing air pipe through a Venturi pipe.
3. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 2, wherein: the premixing air pipe is connected with a tee joint, one inlet of the tee joint is connected with a venturi tube, the other end of the venturi tube is communicated with the premixing air pipe, and the other inlet of the tee joint is communicated with an air supply pipeline.
4. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: a flue gas inlet is formed in the side wall of the front part of the middle section air outlet pipe; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas inlet and mixed with the combustion-supporting air to participate in combustion.
5. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: the shell is provided with a premixing air loop communicated with an air source, and the premixing air loop is communicated with each premixing air pipe through a flexible premixing air pipe.
6. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: a premixed gas loop communicated with a gas source is arranged on the shell or in the air channel, and the premixed gas loop is communicated with each premixed gas pipe through a flexible premixed gas pipe.
7. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: the inner cylinder divides the inner space of the air outlet pipe into an inner air outlet channel and an outer air outlet channel, and the front end of the central air pipe and the central air tap are positioned in the inner air outlet channel; in the axial direction of the air outlet pipe, the front end of the inner cylinder is positioned at the rear part of the flaring section.
8. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: the front end of the outer annular air pipe is connected with the rear end of the air suction mixing pipe through a second blade extending in the radial direction; the rear part of the outer air pipe extends into the air distribution pipe and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe penetrates through the shell and is communicated with an air distribution cavity in the annular air distribution disc; the gas distribution plate is provided with a rotatable adjusting nut, the inner periphery of the adjusting nut is connected with an adjusting rod through threads, and the adjusting rod penetrates through the gas distribution plate and extends into the gas distribution pipe so as to be connected with the outer annular gas pipe through a first blade extending in the radial direction; the adjusting nut, the adjusting rod, the outer annular air pipe and the air suction mixing pipe are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to axially move; the gas distribution cavity in the gas distribution disc is communicated with a gas source through a gas supply pipeline; the gas enters the gas distribution cavity through the gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe.
9. The center ultra-mixed low nitrogen internal reflux gas burner as set forth in claim 1, wherein: the front end surface of the air suction mixing pipe is an inclined plane back to the axis of the air outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153766.9A CN111271707A (en) | 2020-03-07 | 2020-03-07 | Center ultra-mixing low-nitrogen internal reflux gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153766.9A CN111271707A (en) | 2020-03-07 | 2020-03-07 | Center ultra-mixing low-nitrogen internal reflux gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111271707A true CN111271707A (en) | 2020-06-12 |
Family
ID=70995934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010153766.9A Pending CN111271707A (en) | 2020-03-07 | 2020-03-07 | Center ultra-mixing low-nitrogen internal reflux gas burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111271707A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112178626A (en) * | 2020-11-03 | 2021-01-05 | 上海诺特飞博燃烧设备有限公司 | Internal circulation low-nitrogen gas burner |
| CN113701156A (en) * | 2021-09-07 | 2021-11-26 | 欧保(中国)环境工程股份有限公司 | Gas burner with low nitrogen oxide emission |
-
2020
- 2020-03-07 CN CN202010153766.9A patent/CN111271707A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112178626A (en) * | 2020-11-03 | 2021-01-05 | 上海诺特飞博燃烧设备有限公司 | Internal circulation low-nitrogen gas burner |
| CN112178626B (en) * | 2020-11-03 | 2022-04-08 | 上海诺特飞博燃烧设备有限公司 | Internal circulation low-nitrogen gas burner |
| CN113701156A (en) * | 2021-09-07 | 2021-11-26 | 欧保(中国)环境工程股份有限公司 | Gas burner with low nitrogen oxide emission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102330978B (en) | Flame tolerant secondary fuel nozzle | |
| CN110836383B (en) | High-temperature flue gas generator and control method thereof | |
| CN111174204A (en) | Low-nitrogen furnace internal reflux gas burner | |
| CN105737203A (en) | Swirler and pre-mixing combustor adopting same | |
| CN111271707A (en) | Center ultra-mixing low-nitrogen internal reflux gas burner | |
| CN105737152A (en) | Combusting device for low nitrogen combustion of classification pre-mixed swirling flow | |
| CN113587087A (en) | Premixing type hydrogen-rich waste gas blending combustion burner | |
| CN213656737U (en) | Low-nitrogen multi-reflux gas burner | |
| CN111895410B (en) | Vector control gas low-nitrogen burner | |
| CN207196496U (en) | A kind of low nitrogen gas burner for being applied to ignition of the boiler and mixing burning | |
| CN212029499U (en) | Center ultra-mixing low-nitrogen internal reflux gas burner | |
| CN209325775U (en) | A kind of super low NO | |
| CN211694876U (en) | Low-nitrogen furnace internal reflux gas burner | |
| CN215765086U (en) | Low nitrogen oxide discharges gas burner | |
| CN111023089A (en) | Low-nitrogen premixed flue gas internal circulation gas burner | |
| CN213178331U (en) | Gas flow vector control device | |
| CN114135870B (en) | Low-nitrogen combustion head, combustion device and premixing method thereof | |
| CN111895409B (en) | Gas flow vector control device | |
| CN111121005B (en) | Decoupling gas burner and using method thereof | |
| CN211575107U (en) | Low-nitrogen premixed flue gas internal circulation gas burner | |
| CN113108277A (en) | Ultralow NO of medium and small boilerxCO discharging gas burner | |
| CN216408952U (en) | Combustor, drying system and mixing plant | |
| CN220119372U (en) | Performance self-adaptive low-nitrogen combustor | |
| CN210772168U (en) | Ultralow-nitrogen burner for water jacket heating furnace | |
| CN213178332U (en) | Vector control gas low-nitrogen burner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |