CN109973994B - Low-nitrogen burner - Google Patents
Low-nitrogen burner Download PDFInfo
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- CN109973994B CN109973994B CN201910265483.0A CN201910265483A CN109973994B CN 109973994 B CN109973994 B CN 109973994B CN 201910265483 A CN201910265483 A CN 201910265483A CN 109973994 B CN109973994 B CN 109973994B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 150
- 239000002737 fuel gas Substances 0.000 claims abstract description 90
- 239000000446 fuel Substances 0.000 claims abstract description 49
- 239000007921 spray Substances 0.000 claims abstract description 41
- 239000003546 flue gas Substances 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000012806 monitoring device Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 239000000779 smoke Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- -1 metallurgy Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 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
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2207/00—Ignition devices associated with burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14003—Special features of gas burners with more than one nozzle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14021—Premixing burners with swirling or vortices creating means for fuel or air
Abstract
The invention provides a low-nitrogen combustor, which comprises a shell, wherein the shell is formed by coaxially connecting a fuel section and a combustion section, and a fuel gas connecting pipe is vertically connected to the outer wall of the fuel section; the outer wall of the combustion section is vertically connected with a combustion air connecting pipe, the combustion section also comprises a fuel gas channel communicated with the fuel section, and the low-nitrogen combustor also comprises an ignition device and a primary fuel gas branch pipeline; the first-stage fuel gas branch pipeline is communicated with the fuel gas channel, and a first-stage fuel nozzle is arranged on the first-stage fuel gas branch pipeline; the inner side of the combustion section is also connected with a secondary fuel gas annular gap channel and a secondary fuel gas branch pipeline, and one end of the secondary fuel gas annular gap is provided with a plurality of secondary fuel spray pipes. The invention adopts the structure of fuel classification and internal circulation of flue gas, and combustion air is impacted vertically with the air flow sprayed out by the primary fuel nozzle and is ignited by the pilot lamp. At the outlet of the burner, the secondary fuel is sprayed out and added to burn, the high-speed airflow or flame forms local negative pressure to form a low-temperature rich combustion area, thereby reducing NO x 。
Description
Technical Field
The invention belongs to the field of industrial equipment, and particularly relates to a low-nitrogen combustor.
Background
Along with the increasing remarkable global fossil energy consumption and environmental problems, energy conservation and emission reduction are becoming the urgent problems in the industrialized process of countries around the world. For China, the influence of a rough and unexplained economic development mode on energy and environment is particularly huge, and the energy conservation and emission reduction tasks are difficult. The gas fuel with medium and low calorific value is widely used in the production process of industries such as coal production, coal chemical industry, petrochemical industry, iron and steel, metallurgy, textile printing and dyeing, and the like, such as coke oven gas, blast furnace gas, converter gas, and the like. In recent years, the industrial application research of middle and low heat value gas fuel is paid attention to, the gas has low heat value, but wide sources and huge total amount, the enhanced recycling of the gas has important significance of energy conservation and environmental protection, the energy utilization rate is improved, and the contradiction between energy supply and demand in China is further relieved.
With the development of combustion technology, developing a burner using medium and low calorific value gas as fuel has become one of important problems of energy conservation and emission reduction in China. However, for many years, research into medium and low heating value gas fuel burners has focused mainly on improving the performance of the burner, and far from attention on controlling nitrogen oxides in combustion flue gas.
With the implementation of the latest emission standards for atmospheric pollutants (GB 13223-2011), the national multi-place outlet policy requires NO for gas boilers x The discharge mass concentration is controlled to 30mg/m 3 (punctuation, 3.5% O) 2 ) The following is given. While current conventional burners have failed to meet the current emissions requirements. In order to meet the latest environmental protection standard, on the basis of the existing technology, a novel high-efficiency NO-type fuel engine with reasonable structure, high combustion efficiency and NO x A low nitrogen burner with low emission of gaseous fuel.
Disclosure of Invention
Aiming at the defects and the shortcomings of the prior art, the invention aims to disclose a low-nitrogen burner, which solves the problems of complex burner structure, low combustion efficiency, high local combustion temperature and NO in the prior art x High discharge concentration.
In order to solve the technical problems, the application is realized by adopting the following technical scheme: the low-nitrogen combustor comprises a shell, wherein the shell is formed by coaxially connecting a fuel section and a combustion section, and a fuel gas connecting pipe is vertically connected to the outer wall of the fuel section;
the combustion section also comprises a fuel gas channel communicated with the fuel section, and the low-nitrogen combustor also comprises an ignition device coaxially sleeved with the shell;
the combustion section also comprises a plurality of primary fuel gas branch pipelines which are radially arranged along the fuel gas channel and are communicated, one end of each primary fuel gas branch pipeline is communicated with the fuel gas channel, the other end of each primary fuel gas branch pipeline is closed, and a plurality of primary fuel nozzles are uniformly arranged on both sides of each primary fuel gas branch pipeline along the circumferential direction;
the inner side of the combustion section is also connected with a secondary fuel gas annular gap channel, a secondary fuel gas branch pipeline is connected between the secondary fuel gas annular gap channel and the fuel gas channel, and the secondary fuel gas branch pipeline is connected in the combustion section;
the annular plate is arranged at one end of the secondary fuel gas annular gap channel, which is far away from the secondary fuel gas branch pipeline, and a plurality of secondary fuel spray pipes are uniformly arranged on the annular plate along the circumferential direction.
The invention also has the following technical characteristics:
the end face of the secondary fuel spray pipe is uniformly provided with a first circular spray hole, a second circular spray hole and a third circular spray hole along the circumference, the axial included angles of the first circular spray hole, the second circular spray hole and the third circular spray hole and the spray pipe are 15 degrees, the first circular spray hole is inclined outwards along the radial direction of the annular plate, and the second circular spray hole and the third circular spray hole are inclined inwards along the radial direction of the annular plate.
The combustion section is formed by communicating a combustion air cavity, a combustion air channel and a combustion cavity, and the combustion air connecting pipe is communicated with the combustion air cavity.
The combustion-supporting air cavity is also coaxially provided with a combustion-supporting air uniformly-distributing device, the combustion-supporting air uniformly-distributing device is formed by coaxially connecting a uniform diameter section and an expanded diameter section, the uniform diameter section is hollow cylindrical, and the expanded diameter section is hollow round table-shaped;
the combustion air uniform distributor is provided with a plurality of uniform flow grooves along the circumferential direction.
The combustion air channel in still arrange combustion air cyclone, combustion air cyclone be two-layer structure, from interior to exterior be one-level swirl vane and second grade swirl vane, one-level swirl vane and second grade swirl vane's flow area ratio be 2~3: 7-8, wherein the included angles of the primary swirl blades, the secondary swirl blades and the axial direction are all 30 degrees;
the combustion air swirling device is sleeved with the second fuel gas channel, and the outer diameter of the combustion air swirling device and the inner diameter of the combustion air channel are the same in size.
And the combustion-supporting air cavity is also connected with a smoke recirculation interface.
The secondary fuel gas annular gap channel is provided with a baffle plate at one end close to the combustion air uniform distributor.
The ignition device comprises a pilot burner and a flame monitoring device which are arranged side by side, and the ignition device penetrates through the fuel gas channel.
The high-energy ignition gun is arranged in the pilot lamp, the tail end of the pilot lamp is of a horn-shaped structure, and a plurality of round holes are uniformly distributed on the horn mouth in the circumferential direction.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts the structure of fuel classification and internal smoke circulation, and after the whole combustion air is swirled by a swirling device, the combustion air is vertically impacted with the air flow sprayed out by the primary fuel nozzle, and the fully mixed air flow is ignited by a central pilot burner of the burner. At the outlet of the burner, a large amount of secondary fuel is sprayed out at high speed through the secondary fuel nozzle, and is added into combustion, high-speed airflow or flame forms local negative pressure, smoke entrainment reflux is generated in the boiler furnace, a low-temperature rich combustion area is formed, and the combustion temperature is far lower than 1500 ℃ at the moment, so that NO is reduced x 。
The invention also adopts a structure of external circulation of the flue gas, a part of the flue gas returns to the combustion air cavity through the flue gas recirculation interface and is mixed with the combustion air, so that the oxygen concentration of the combustion air is reduced, the combustion intensity is reduced, and meanwhile, the returned flue gas can absorb a part of heat to reduce the combustion temperature, so that the generation of nitrogen oxides is inhibited.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention.
Fig. 2 is a right side view of the present invention.
FIG. 3 is a schematic cross-sectional view of a primary fuel gas manifold.
FIG. 4 is a schematic diagram of the end configuration of a secondary fuel gas lance.
Fig. 5 is a schematic view of the structure of the combustion air distributor.
Fig. 6 is a schematic view of the combustion air swirling device.
The meaning of each reference numeral in the figures is: the device comprises a shell, a 2-fuel section, a 3-combustion section, a 4-fuel gas connection pipe, a 5-combustion air connection pipe, a 6-fuel gas channel, a 7-ignition device, an 8-primary fuel gas branch pipeline, a 9-primary fuel nozzle, a 10-secondary fuel gas annular gap channel, an 11-secondary fuel gas branch pipeline, a 12-annular plate, a 13-secondary fuel nozzle, a 14-first circular nozzle, a 15-second circular nozzle, a 16-third circular nozzle, a 17-combustion air cavity, a 18-combustion air channel, a 19-combustion cavity, a 20-combustion air distributor, a 21-uniform diameter section, a 22-expanded diameter section, a 23-uniform flow groove, a 24-combustion air swirling device, a 25-primary swirling blade, a 26-secondary swirling blade, a 27-flue gas recirculation interface, a 28-baffle plate, a 29-pilot lamp, a 30-flame monitoring device and a 31-high-energy ignition gun.
The details of the invention are explained in further detail below with reference to the drawings and examples.
Detailed Description
The following specific embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solutions of the present application fall within the protection scope of the present invention.
Examples:
according to the technical scheme, as shown in fig. 1 to 6, the embodiment provides a low-nitrogen combustor, which comprises a shell 1, wherein the shell 1 is formed by coaxially connecting a fuel section 2 and a combustion section 3, and a fuel gas connecting pipe 4 is vertically connected to the outer wall of the fuel section 2; the fuel gas nipple is used for introducing fuel gas.
The outer wall of the combustion section 3 is vertically connected with a combustion air connecting pipe 5, the combustion section 3 also comprises a fuel gas channel 6 communicated with the fuel section 2, and the low-nitrogen burner also comprises an ignition device 7 coaxially sleeved with the shell 1; the combustion air connecting pipe is used for introducing combustion air, the fuel gas channel is used for conveying fuel gas, and the ignition device is used for ignition.
The combustion section 3 further comprises a plurality of first-stage fuel gas branch pipelines 8 which are radially arranged along the fuel gas channel 6 and are communicated with each other, one end of each first-stage fuel gas branch pipeline 8 is communicated with the fuel gas channel 6, the other end of each first-stage fuel gas branch pipeline is closed, and a plurality of first-stage fuel nozzles 9 are uniformly arranged on both sides of each first-stage fuel gas branch pipeline 8 along the circumferential direction; a part of fuel gas enters the primary fuel gas branch pipeline 8 through the fuel gas channel and then is sprayed out through the primary fuel nozzle to participate in combustion.
The inner side of the combustion section 3 is also connected with a secondary fuel gas annular gap channel 10, a secondary fuel gas branch pipeline 11 is connected between the secondary fuel gas annular gap channel 10 and the fuel gas channel 6, and the secondary fuel gas branch pipeline 11 is connected in the combustion section 3;
the end of the secondary fuel gas annular gap channel 10, which is far away from the secondary fuel gas branch pipe 11, is provided with an annular plate 12, and the annular plate 12 is uniformly provided with a plurality of secondary fuel spray pipes 13 along the circumferential direction. The other part of fuel gas enters the secondary fuel gas branch pipeline through the fuel gas channel, and is sprayed out of the secondary fuel spray pipe after passing through the secondary fuel gas clearance channel to participate in combustion.
As a preferable example of the present embodiment, the first circular spray holes 14, the second circular spray holes 15 and the third circular spray holes 16 are uniformly arranged on the end face of the secondary fuel spray pipe 13 along the circumference, the axial included angles of the first circular spray holes 14, the second circular spray holes 15 and the third circular spray holes 16 and the spray pipe are 15 °, the first circular spray holes 14 incline radially outwards along the annular plate 12, and the second circular spray holes 15 and the third circular spray holes 16 incline radially inwards along the annular plate 12.
When the fuel gas is sprayed out from the circular nozzle at high speed, surrounding smoke can be sucked, the combustion temperature can be reduced, and the formation of a local high-temperature area in the combustion process is avoided.
The first circular spray holes incline outwards along the radial direction of the annular plate, so that the effect of dispersed combustion is achieved, and the formation of local severe high-temperature combustion areas is avoided.
The second circular spray holes and the third circular spray holes incline inwards along the radial direction of the annular plate, so that the secondary fuel gas is directly sprayed into the central combustion area, on one hand, the effect of stable combustion is achieved, and on the other hand, the smoke around the high-speed airflow entrainment is added for combustion, so that the temperature of the combustion center can be reduced, and the formation of a local high-temperature area is avoided.
As a preference of this embodiment, the combustion section 3 is formed by communicating a combustion air cavity 17, a combustion air channel 18 and a combustion cavity 19, and the combustion air connection pipe 5 is communicated with the combustion air cavity 17.
As a preference of this embodiment, a combustion air distributor 20 is coaxially disposed in the combustion air cavity 17, the combustion air distributor 20 is formed by coaxially connecting a uniform diameter section 21 and an expanded diameter section 22, the uniform diameter section 21 is hollow cylinder, and the expanded diameter section 22 is hollow truncated cone;
the combustion air uniform distributor 20 is provided with a plurality of uniform flow grooves 23 along the circumferential direction.
On one hand, the combustion air uniformly distributor enables the combustion air to be uniformly distributed into the combustion air channel along the circumferential direction from the combustion air cavity, and prevents the combustion air from directly entering the combustion air channel from the inlet side, so that the combustion air is seriously unevenly distributed, and the mixing with the primary fuel gas is affected; on the other hand, the recirculated flue gas returned into the combustion air cavity is uniformly distributed into the combustion air channel along the circumferential direction, so that the recirculated flue gas is fully mixed with the combustion air, and the direct opposite flushing of the recirculated flue gas and the combustion air is avoided, thereby causing uneven air flow distribution.
As a preferable mode of this embodiment, a combustion air swirling device 24 is further disposed in the combustion air channel 18, the combustion air swirling device 24 has a two-layer structure, and a primary swirling blade 25 and a secondary swirling blade 26 are disposed from inside to outside, and a flow area ratio of the primary swirling blade 25 to the secondary swirling blade 26 is 2-3: 7-8, wherein the included angles between the primary swirl blades 25, the secondary swirl blades 26 and the axial direction are 30 degrees;
the combustion air swirling device has the main functions that on one hand, the swirling effect of the swirling blades is utilized to enable the combustion air to generate stronger rotation after passing through the swirling blades, so that the mixing of the combustion air and fuel gas is enhanced; on the other hand, the combustion air is divided into primary combustion air and secondary combustion air according to the area ratio of the two-stage swirl blades, so that the combustion air is mixed with the primary fuel gas for combustion in different forms and time.
The combustion air swirling device 24 is sleeved with the second fuel gas channel 6, and the outer diameter of the combustion air swirling device 24 and the inner diameter of the combustion air channel 18 are the same size.
As a preferred embodiment, the combustion air cavity 17 is also connected with a flue gas recirculation port 27.
Part of the smoke is returned to the combustion air cavity through the smoke recirculation interface and is mixed with the combustion air, so that the oxygen concentration of the combustion air is reduced, the combustion intensity is reduced, and meanwhile, the returned smoke can absorb part of heat to reduce the combustion temperature, so that the generation of nitrogen oxides is inhibited.
As a preferred embodiment, the secondary fuel gas annulus channel 10 is provided with a baffle 28 at one end adjacent the combustion air distributor 20. The baffle is used for separating from the combustion-supporting air cavity.
As a preferred embodiment, the ignition device 7 comprises a pilot lamp 29 and a flame monitoring device 30 arranged side by side, the ignition device 7 penetrating the fuel gas channel 6.
As a preferable mode of this embodiment, a high-energy ignition gun 31 is disposed in the pilot lamp 29, the end of the pilot lamp 29 is in a horn-shaped structure, and a plurality of round holes are circumferentially and uniformly distributed on the horn mouth.
The flame monitoring device 30 is used for monitoring the flame of the pilot burner 29 in real time and performing safety interlock control with the whole burner system. When abnormal working conditions such as failure of ignition of the burner, abrupt extinguishment of a pilot burner in the hearth and the like occur, the signal lamp of the flame detection device 30 is extinguished and fed back to the central control system. The system is controlled by interlocking, and the fuel gas supply is cut off instantaneously, so that the safety of the system is ensured.
Wherein, the fuel gas adopts coke oven gas.
Wherein the residual air coefficient of the combustion air is 1.3-1.4.
Wherein, the distribution ratio of the primary fuel to the secondary fuel is 30-40 percent: 60-70%.
Wherein the recirculated flue gas amount is 15-25% of the total flue gas amount.
The specific working process of the embodiment is as follows:
the coke oven gas is fed from the fuel gas main channel and the secondary fuel gas annular gap channel respectively in two stages to participate in combustion, and the combustion air is completely supplied by the combustion air channel. Part of the smoke is returned to the combustion air cavity through a smoke recycling (FGR) interface, is mixed with the combustion air, and reduces the oxygen concentration of the combustion air, so that the combustion intensity is reduced, and meanwhile, the returned smoke can absorb part of heat to reduce the combustion temperature, so that the generation of nitrogen oxides is inhibited.
After the whole combustion air is swirled by the combustion air swirling device, the combustion air is impacted vertically with the fuel air flow sprayed out by the primary fuel nozzle, and the fully mixed air flow is ignited by a burner center pilot lamp. The primary fuel and all the combustion air form an oxygen-enriched lean combustion zone in the center of the burner, and the combustion temperature is far lower than 1500 ℃ because of the small fuel quantity although the combustion air excess coefficient is large at the combustion zone, so that a large amount of NO is not formed x . At the outlet of the burner, a large amount of secondary fuel is sprayed out from the secondary fuel nozzle at high speed to burn, the high-speed airflow forms local negative pressure, smoke entrainment and reflux are generated in the boiler furnace to form a low-temperature rich combustion area, and the burning temperature is far lower than 1500 ℃, so that a large amount of NO can not be formed x Thereby ensuring the burner outlet NO x The discharge mass concentration is less than 30mg/m 3 Meets the latest environmental protection requirement.
Claims (4)
1. The low-nitrogen combustor comprises a shell (1), wherein the shell (1) is formed by coaxially connecting a fuel section (2) and a combustion section (3), and a fuel gas connecting pipe (4) is vertically connected to the outer wall of the fuel section (2);
the outer wall of the combustion section (3) is vertically connected with a combustion air connecting pipe (5), the combustion section (3) further comprises a fuel gas channel (6) communicated with the fuel section (2), and the low-nitrogen combustor further comprises an ignition device (7) coaxially sleeved with the shell (1);
the combustion section (3) is characterized by further comprising a plurality of primary fuel gas branch pipelines (8) which are radially arranged and communicated along the fuel gas channel (6), one end of each primary fuel gas branch pipeline (8) is communicated with the fuel gas channel (6), the other end of each primary fuel gas branch pipeline is closed, and a plurality of primary fuel nozzles (9) are uniformly arranged on both sides of each primary fuel gas branch pipeline (8) along the circumferential direction;
the inner side of the combustion section (3) is also connected with a secondary fuel gas annular gap channel (10), a secondary fuel gas branch pipeline (11) is connected between the secondary fuel gas annular gap channel (10) and the fuel gas channel (6), and the secondary fuel gas branch pipeline (11) is connected in the combustion section (3);
one end of the secondary fuel gas annular gap channel (10) far away from the secondary fuel gas branched pipeline (11) is provided with an annular plate (12), and the annular plate (12) is uniformly provided with a plurality of secondary fuel spray pipes (13) along the circumferential direction;
the combustion section (3) is formed by communicating a combustion air cavity (17), a combustion air channel (18) and a combustion cavity (19), and the combustion air connecting pipe (5) is communicated with the combustion air cavity (17);
the combustion-supporting air cavity (17) is also coaxially provided with a combustion-supporting air uniformly-distributing device (20), the combustion-supporting air uniformly-distributing device (20) is formed by coaxially connecting a uniform diameter section (21) and an expanded diameter section (22), the uniform diameter section (21) is hollow and cylindrical, and the expanded diameter section (22) is hollow and round table-shaped;
the combustion air uniform distributor (20) is provided with a plurality of uniform flow grooves (23) along the circumferential direction;
a baffle (28) is arranged at one end of the secondary fuel gas annular gap channel (10) close to the combustion air uniformly-distributing device (20);
the ignition device (7) comprises a pilot burner (29) and a flame monitoring device (30) which are arranged side by side, and the ignition device (7) penetrates through the fuel gas channel (6);
the utility model discloses a high-energy igniting gun (31) is arranged in the pilot lamp (29), the tail end of the pilot lamp (29) is of a horn-shaped structure, and a plurality of round holes are uniformly distributed on the horn mouth in the circumferential direction.
2. The low-nitrogen combustor as claimed in claim 1, wherein the first circular spray holes (14), the second circular spray holes (15) and the third circular spray holes (16) are uniformly arranged on the end face of the secondary fuel spray pipe (13) along the circumference, the axial included angles of the first circular spray holes (14), the second circular spray holes (15) and the third circular spray holes (16) and the spray pipe are 15 degrees, the first circular spray holes (14) incline outwards along the radial direction of the annular plate (12), and the second circular spray holes (15) and the third circular spray holes (16) incline inwards along the radial direction of the annular plate (12).
3. The low-nitrogen combustor as claimed in claim 1, wherein a combustion air swirling device (24) is further arranged in the combustion air channel (18), the combustion air swirling device (24) has a two-layer structure, a primary swirling blade (25) and a secondary swirling blade (26) are arranged from inside to outside, and the flow area ratio of the primary swirling blade (25) to the secondary swirling blade (26) is 2-3: 7-8, wherein the included angles between the primary swirl blades (25), the secondary swirl blades (26) and the axial direction are 30 degrees;
the combustion air swirling device (24) is sleeved with the fuel gas channel (6), and the outer diameter of the combustion air swirling device (24) and the inner diameter of the combustion air channel (18) are the same in size.
4. A low nitrogen burner according to claim 1, characterized in that said combustion air cavity (17) is further connected with a flue gas recirculation interface (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910265483.0A CN109973994B (en) | 2019-04-03 | 2019-04-03 | Low-nitrogen burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910265483.0A CN109973994B (en) | 2019-04-03 | 2019-04-03 | Low-nitrogen burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109973994A CN109973994A (en) | 2019-07-05 |
| CN109973994B true CN109973994B (en) | 2023-12-29 |
Family
ID=67082658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910265483.0A Active CN109973994B (en) | 2019-04-03 | 2019-04-03 | Low-nitrogen burner |
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