CN110566947A - Ultra-low nitrogen premixed gas burner and burning method thereof - Google Patents
Ultra-low nitrogen premixed gas burner and burning method thereof Download PDFInfo
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- CN110566947A CN110566947A CN201910870032.XA CN201910870032A CN110566947A CN 110566947 A CN110566947 A CN 110566947A CN 201910870032 A CN201910870032 A CN 201910870032A CN 110566947 A CN110566947 A CN 110566947A
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- premixed gas
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- burner
- mixer
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- 239000007789 gas Substances 0.000 title claims abstract description 92
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title description 5
- 238000002485 combustion reaction Methods 0.000 claims abstract description 56
- 238000009841 combustion method Methods 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims abstract description 4
- 230000009970 fire resistant effect Effects 0.000 claims description 9
- 239000002737 fuel gas Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- 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
- F23D14/62—Mixing devices; Mixing tubes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to the technical field of gas combustion devices, in particular to an ultra-low nitrogen premixed gas burner and a combustion method thereof, which comprises a plurality of nozzles arranged at the tail end of the burner, wherein premixed gas in the burner is uniformly distributed through the nozzles and then enters a hearth; the premixed gas is ignited at the outlet end of the nozzle and then is subjected to de-ignition combustion in the hearth; the nozzle comprises a hollow shell and a solid blunt body, the shell is sleeved outside the blunt body, and a channel for circulating premixed gas is formed between the shell and the blunt body. The invention adopts a full-premix combustion mode, and the premixed gas circulates in the nozzle channel and is subjected to fire-removing combustion at the nozzle outlet by arranging a plurality of nozzles at the tail end of the combustor, so that the low emission of nitrogen oxides (NOx) is realized under the condition of not reducing the combustion efficiency.
Description
Technical Field
The invention relates to the technical field of gas combustion devices, in particular to an ultralow-nitrogen premixed gas burner and a combustion method thereof.
Background
Nitrogen oxides form acid rain, which is one of the components of atmospheric pollutants and is also a component of the atmospheric pollutantsOne of the main components forming haze, the Beijing city promulgates a new emission standard of atmospheric pollutants for boilers, the stipulation is from 4 months and 1 day of 2017, and the emission limit value of nitrogen oxides of all gas boilers in use is 80mg/m3nitrogen oxide NO of newly-built gas boilerXEmission limit of 30mg/m3This places low nitrogen emissions requirements on current combustion devices.
the gas combustion low-nitrogen combustion control technology mainly reduces the synthesis of nitrogen oxides by reducing the flame temperature. The low-nitrogen combustion technology for gas combustion in the current market mainly comprises three modes of a flue gas recirculation technology, a full-premixing surface combustion technology and a water-cooling premixing combustion technology. The flue gas recirculation technology realizes 30mg/m by refluxing partial flue gas3NO ofXEmissions, but reduced combustion efficiency; the full-premixing surface combustion technology realizes 30mg/m by increasing combustion air quantity3NO ofXemissions, also reducing combustion efficiency; the water-cooled premixed combustion can realize 30mg/m under the conditions of standard combustion air quantity and no need of flue gas backflow3NO ofXThe emission is realized, the combustion efficiency is not reduced, but the NO can be reduced by arranging circulating cooling water in water-cooling premixed combustionXEmission, the burner can only be integrated with the boiler to reduce NOXTherefore, the burner in the water-cooling premixed combustion is not suitable for low-nitrogen modification of a boiler and is only suitable for a newly-built boiler, so that the use occasion of the burner in the water-cooling premixed combustion is limited.
disclosure of Invention
the invention aims to solve the problem that the smoke recirculation technology and the full-premixing surface combustion technology are reducing NOXThe problem that the combustion efficiency is reduced when the emission is carried out, and the reduction of NO in the process of water-cooling premixed combustionXthe problem that the application occasions of the burner are limited while the emissions are discharged is solved, and an ultra-low nitrogen premixed gas burner and a combustion method thereof are provided.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an ultra-low nitrogen premixed gas burner comprises a plurality of nozzles arranged at the tail end of the burner, wherein premixed gas in the burner is uniformly distributed through the nozzles and then enters a hearth; the premixed gas is ignited at the outlet end of the nozzle and then is subjected to de-ignition combustion in the hearth; the nozzle comprises a hollow shell and a solid blunt body, the shell is sleeved outside the blunt body, and a channel for circulating premixed gas is formed between the shell and the blunt body.
Furthermore, the device also comprises a distribution cavity communicated with the inlet end of the nozzle, wherein one end of the distribution cavity is a premixed gas inlet, and the other end of the distribution cavity is provided with a tube plate; the inlet end of the nozzle is located in the tube sheet.
Furthermore, one end of the tube plate, which is far away from the distribution cavity, is connected with the refractory plate, and the nozzle penetrates through the end face of the refractory plate and is opposite to the hearth; the outer side surface of the fire-resistant plate is provided with an outer cover.
further, the shape of the outer cover is rectangular or cylindrical, and the cross sections of the nozzles are uniformly distributed in a matrix shape or a circular shape.
furthermore, the tail end of the combustor is provided with an ignition hole and a fire observation hole, and the ignition hole and the fire observation hole successively penetrate through the tube plate and the fire-resistant plate; an ignition device is arranged in the ignition hole.
further, the device also comprises a mixer, wherein an outlet of the mixer is connected with one end of the distribution cavity; the mixer is provided with a gas inlet and an air inlet.
Further, the gas mixer further comprises a blower, an outlet of the blower is connected with an air inlet of the mixer, the mixer sucks air through the blower, and the air and the fuel gas form premixed gas in the mixer.
further, the device also comprises a blower, and an outlet of the blower is connected with one end of the distribution cavity.
Further, the device also comprises a mixer, wherein an outlet of the mixer is connected with an inlet of the blower; the mixer is also provided with a gas inlet and an air inlet, the air and the gas form premixed gas in the mixer, and the premixed gas enters the distribution cavity through the blower.
the invention also provides a combustion method of the ultra-low nitrogen premixed gas burner, which comprises the following steps:
S1, mixing air and fuel gas according to a set proportion to form premixed gas, and introducing the premixed gas into the distribution cavity;
S2, uniformly distributing the premixed gas in the distribution cavity through a plurality of nozzles and then entering the hearth:
And S3, igniting the premixed gas at the outlet of the nozzle, and performing de-ignition combustion on the premixed gas in the hearth.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a full-premix combustion mode, and through arranging a plurality of nozzles at the tail end of a combustor, premix gas flows in a nozzle channel and is subjected to fire-removing combustion at the outlet of the nozzle, so that low NOx emission is realized under the condition of not reducing the combustion efficiency;
The invention can realize different combustion powers by adjusting the number of the nozzles and the size of the nozzles, and can be suitable for boilers with various powers;
The burner can be independently manufactured, does not need cooling water, can be conveniently installed on a boiler, is simple to install and convenient to maintain, and is very suitable for low-nitrogen modification of an old boiler;
the invention does not need flue gas backflow, does not need to increase the combustion air quantity, has short combustion flame, stable combustion and high heat transfer efficiency, adopts a single-pass boiler, and has small hearth and high safety.
drawings
FIG. 1 is a schematic view of the nozzle position according to an embodiment of the present invention;
FIG. 2 is a view showing the structure of a nozzle according to an embodiment of the present invention;
FIG. 3 is an exploded view of a nozzle in accordance with an embodiment of the present invention;
FIG. 4 is an overall structure diagram of an ultra-low nitrogen premixed gas burner according to an embodiment of the invention;
FIG. 5 is a schematic end view of an ultra-low nitrogen premixed gas burner according to an embodiment of the present invention;
FIG. 6 is a view showing the structure of a cylindrical housing according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a rectangular housing according to an embodiment of the present invention.
1 blower, 2 mixer, 3 distribution chamber, 4 tube plate, 5 outer cover, 6 gas inlet, 7 ignition hole, 8 flame viewing hole, 9 nozzle, 10 fire-resistant plate, 11 ignition device, 12 shell and 13 bluff body.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
example one
As shown in fig. 1-7, the present embodiment is an ultra-low nitrogen premixed gas burner, which includes a plurality of nozzles 9 disposed at the end of the burner, and the burner is connected to the furnace chamber through the nozzles 9. Premixed gas in the combustor is evenly distributed through the nozzle 9 and then enters the hearth, and the premixed gas is ignited at the outlet end of the nozzle 9 and then is subjected to de-ignition combustion in the hearth. The nozzle 9 comprises a hollow shell 12 and a solid bluff body 13, the shell 12 is sleeved outside the bluff body 13, and a channel for circulating premixed gas is formed between the shell 12 and the bluff body 13. The housing 12 has a cylindrical shape with both ends open, the blunt body 13 has a cylindrical shape, and the length of the housing 12 is substantially the same as that of the blunt body 13. In the embodiment, the plurality of nozzles 9 are arranged at the tail end of the combustor, so that the premixed gas flows in the passages of the nozzles 9 and is subjected to de-ignition combustion at the outlets of the nozzles 9, and low NOx emission is realized without reducing the combustion efficiency. The number and the size of the nozzles 9 can be flexibly adjusted to realize different combustion powers, and the device is suitable for boilers with various powers. The combustor of this embodiment does not need the cooling water cooling at the in-process that reduces NOx, and installation that can be convenient on the boiler, the installation is simple simultaneously, it is convenient to maintain, and the low nitrogen of especially adapted old boiler is reformed transform. When the premixed gas is subjected to fire-removing combustion at the outlet of the nozzle 9, the combustion flame is short, the combustion is stable, the heat transfer efficiency is high, smoke backflow is not needed, the combustion air amount is not needed to be increased, the boiler can adopt a single return stroke, the boiler furnace is small, and the safety performance is high.
As shown in fig. 4 and 5, in order to uniformly distribute the premixed gas into each nozzle 9, the present embodiment further includes a distribution chamber 3 communicating with the inlet end of the nozzle 9. One end of the distribution cavity 3 is a premixed gas inlet, and the other end is provided with a tube plate 4. The tube plate 4 is made of high-temperature steel plates. To facilitate the positioning of the nozzles 9 on the tube plate 4, the tube plate 4 is provided with an opening adapted to the size of the shell 12, and the inlet ends of the nozzles 9 are located in the tube plate 4 and are welded to the tube plate 4. In order to facilitate the flexible connection of the burner and the hearth, bolt holes are arranged on the periphery of the tube plate 4 and are connected with the hearth tube plate through bolts in the bolt holes. The end of the tube plate 4 far away from the distribution chamber 3 is connected with a refractory plate 10, and the nozzle 9 penetrates through the end face of the refractory plate 10 and faces the hearth. In order to protect the fire-resistant plate 10 from being damaged, the outer side surface of the fire-resistant plate 10 in the length direction is provided with an outer cover 5, and the outer cover 5 wraps the outer side surface of the fire-resistant plate 10 to play a role in fixing and protecting the fire-resistant plate. As shown in fig. 6 and 7, the shape of the housing 5 can be designed to be rectangular or cylindrical according to actual requirements. The cross sections of the plurality of nozzles 9 are uniformly arranged in a matrix shape or a circular shape, and can also be uniformly arranged in other shapes. In order to facilitate ignition and flame observation, the end of the burner of the embodiment is further provided with an ignition hole 7 and a fire observation hole 8. The ignition hole 7 and the fire observation hole 8 successively penetrate through the tube plate 4 and the fire-resistant plate 10. An ignition device 11 is arranged in the ignition hole 7.
the embodiment also comprises a blower 1 and a mixer 2, wherein the mixer 2 is provided with a gas inlet 6 and an air inlet. When the combustion power is more than 1.4MW, the mixer 2 is installed at the outlet of the blower 1, specifically, the outlet of the mixer 2 is connected with one end of the distribution cavity 3, the outlet of the blower 1 is connected with the air inlet of the mixer 2, the mixer 2 sucks air through the blower 1, and the air and the fuel gas form premixed gas in the mixer 2. When the combustion power is below 1.4MW, the mixer 2 is installed at the inlet of the blower 1, specifically, the outlet of the blower 1 is connected with one end of the distribution cavity 3, the outlet of the mixer 2 is connected with the inlet of the blower 1, the air and the fuel gas form premixed gas in the mixer 2, and the premixed gas enters the distribution cavity 3 through the blower 1. When the mixer 2 is installed at the inlet of the blower 1, the premixed gas flows through the blower 1, and the blower 1 is made of all-aluminum materials and is subjected to explosion-proof treatment. The central axes of the mixer 2, the distribution chamber 3, the tube plate 4, the refractory plate 10 and the outer cover 5 are all located on the same straight line. Each nozzle 9 is arranged along the direction of the central axis, and the premixed gas enters the hearth along the direction of the central axis.
In the use process, firstly, the premixed gas enters the distribution cavity 3 from the mixer 2 or enters the distribution cavity 3 from the blower 1; then, the premixed gas is uniformly distributed through a nozzle 9 and then enters a hearth; finally, the premixed gas flowing out through the outlet of the nozzle 9 is ignited by the ignition device 11, and the premixed gas is inThe fire-removing combustion is generated in the hearth. Therefore, the embodiment can realize the aim of low nitrogen emission on the basis of not reducing the combustion efficiency, and finally the NOx emission is controlled to be 30mg/m3The following. Meanwhile, the flame of the premixed gas in the hearth for de-ignition combustion is short, the combustion is stable, and the heat transfer efficiency is high. In addition, the combustor of this embodiment independently makes, simple structure, and simple to operate can install in a flexible way on the boiler of different models.
Example two
The embodiment also provides a combustion method of the ultra-low nitrogen premixed gas burner, which comprises the following steps:
s1, mixing air and fuel gas according to a set proportion to form premixed gas, and introducing the premixed gas into the distribution cavity;
S2, uniformly distributing the premixed gas in the distribution cavity through a plurality of nozzles and then entering the hearth:
And S3, igniting the premixed gas at the outlet of the nozzle, and performing de-ignition combustion on the premixed gas in the hearth.
in step S1, a plurality of nozzles having a predetermined length are provided on the outlet end surface of the distribution chamber. In step S2, the premixed gas in the distribution chamber enters the furnace along the channel in the nozzle. In step S3, the premixed gas is subjected to de-ignition combustion, the combustion is intense, the combustion flame is short, the combustion is stable, the heat transfer efficiency is high, and the content of generated flue gas NOx is low.
While the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments without departing from the spirit of the invention, and such variations are to be considered within the scope of the invention.
Claims (10)
1. an ultra-low nitrogen mixes gas burner in advance which characterized in that:
The burner comprises a plurality of nozzles (9) arranged at the tail end of a burner, and premixed gas in the burner is uniformly distributed through the nozzles (9) and then enters a hearth; the premixed gas is ignited at the outlet end of the nozzle (9) and then is subjected to de-ignition combustion in the hearth;
The nozzle (9) comprises a hollow shell (12) and a solid bluff body (13), the shell (12) is sleeved outside the bluff body (13), and a channel for circulating premixed gas is formed between the shell (12) and the bluff body (13).
2. The ultra-low nitrogen premix gas burner as in claim 1, characterized in that:
The device also comprises a distribution cavity (3) communicated with the inlet end of the nozzle (9), one end of the distribution cavity (3) is a premixed gas inlet, and the other end is provided with a tube plate (4); the inlet end of the nozzle (9) is located in the tube plate (4).
3. The ultra-low nitrogen premix gas burner as in claim 2, characterized in that:
One end of the tube plate (4) far away from the distribution cavity (3) is connected with a refractory plate (10), and the nozzle (9) penetrates through the end face of the refractory plate (10) and is opposite to the hearth; the outer side surface of the fire-resistant plate (10) is provided with an outer cover (5).
4. the ultra-low nitrogen premix gas burner of claim 3, characterized in that: the shape of the outer cover (5) is rectangular or cylindrical, and the cross sections of the plurality of nozzles (9) are uniformly distributed into a matrix shape or a circular shape.
5. The ultra-low nitrogen premix gas burner of claim 4, characterized in that: the tail end of the combustor is provided with an ignition hole (7) and a fire observation hole (8), and the ignition hole (7) and the fire observation hole (8) sequentially penetrate through the tube plate (4) and the refractory plate (10); an ignition device (11) is arranged in the ignition hole (7).
6. The ultra-low nitrogen premix gas burner as in claim 2, characterized in that: the mixing device also comprises a mixer (2), and an outlet of the mixer (2) is connected with one end of the distribution cavity (3); the mixer (2) is provided with a gas inlet (6) and an air inlet.
7. The ultra-low nitrogen premix gas burner of claim 6, characterized in that: the gas mixing device is characterized by further comprising a blower (1), an outlet of the blower (1) is connected with an air inlet of the mixer (2), the mixer (2) sucks air through the blower (1), and the air and gas form premixed gas in the mixer (2).
8. the ultra-low nitrogen premix gas burner as in claim 2, characterized in that: the device also comprises a blower (1), and an outlet of the blower (1) is connected with one end of the distribution cavity (3).
9. The ultra-low nitrogen premix gas burner of claim 8, characterized in that: the mixing device also comprises a mixer (2), wherein the outlet of the mixer (2) is connected with the inlet of the blower (1); the mixer (2) is also provided with a gas inlet (6) and an air inlet, the air and the gas form premixed gas in the mixer (2), and the premixed gas enters the distribution cavity (3) through the blower (1).
10. A combustion method of an ultra-low nitrogen premixed gas burner, which adopts the ultra-low nitrogen premixed gas burner as claimed in any one of claims 1 to 9, characterized in that: comprises the following steps of (a) carrying out,
S1, mixing air and fuel gas according to a set proportion to form premixed gas, and introducing the premixed gas into the distribution cavity;
S2, uniformly distributing the premixed gas in the distribution cavity through a plurality of nozzles and then entering the hearth:
And S3, igniting the premixed gas at the outlet of the nozzle, and performing de-ignition combustion on the premixed gas in the hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870032.XA CN110566947A (en) | 2019-09-16 | 2019-09-16 | Ultra-low nitrogen premixed gas burner and burning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870032.XA CN110566947A (en) | 2019-09-16 | 2019-09-16 | Ultra-low nitrogen premixed gas burner and burning method thereof |
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| CN110566947A true CN110566947A (en) | 2019-12-13 |
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| CN201910870032.XA Pending CN110566947A (en) | 2019-09-16 | 2019-09-16 | Ultra-low nitrogen premixed gas burner and burning method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059529A (en) * | 2020-01-02 | 2020-04-24 | 吉林大学 | Ear-cap type high-temperature-resistant premixed combustion nozzle and control method thereof |
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| US20190128525A1 (en) * | 2017-10-31 | 2019-05-02 | Doosan Heavy Industries & Construction Co., Ltd. | Combustor and gas turbine including the same |
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