CN107606613B - Low-nitrogen cyclone gas burner with gas-air precise grading and built-in flue gas recirculation - Google Patents
Low-nitrogen cyclone gas burner with gas-air precise grading and built-in flue gas recirculation Download PDFInfo
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- CN107606613B CN107606613B CN201710892758.4A CN201710892758A CN107606613B CN 107606613 B CN107606613 B CN 107606613B CN 201710892758 A CN201710892758 A CN 201710892758A CN 107606613 B CN107606613 B CN 107606613B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000003546 flue gas Substances 0.000 title claims abstract description 45
- 239000007789 gas Substances 0.000 title claims abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 14
- 239000000446 fuel Substances 0.000 claims abstract description 149
- 239000007921 spray Substances 0.000 claims abstract description 63
- 230000001590 oxidative effect Effects 0.000 claims abstract description 8
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 239000002737 fuel gas Substances 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 230000003134 recirculating effect Effects 0.000 claims 7
- 238000002485 combustion reaction Methods 0.000 abstract description 38
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 18
- 238000010992 reflux Methods 0.000 description 13
- 230000000087 stabilizing effect Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Abstract
The invention relates to a low-nitrogen cyclone gas burner with gas and air precisely graded and built-in flue gas recirculation, which comprises a hearth, a furnace wall, and a central fuel conveying pipeline, a primary air channel and a mixing channel which are sleeved in sequence from inside to outside, wherein the front ends of the central fuel conveying pipeline, the primary air channel and the mixing channel penetrate through the furnace wall and extend into the hearth; the outer side wall of the mixing channel is provided with a plurality of sections of recycling channels, and the recycling channels are positioned in the hearth; the front end of the central fuel conveying pipeline is provided with a central fuel spray head and a plurality of secondary fuel spray heads; a plurality of tertiary fuel guns and secondary air guns are uniformly arranged in the mixing channel at intervals, and the central fuel conveying pipeline and the tertiary fuel guns are connected with a fuel supply device; the primary air channel and the secondary air spray gun are both connected with an oxidant supply device. The invention can effectively improve the combustion condition, has high combustion efficiency and effectively reduces the concentration of nitrogen oxides.
Description
Technical Field
The invention belongs to the field of gas burners, and particularly relates to a low-nitrogen cyclone gas burner with gas and air precisely-graded built-in flue gas recirculation.
Background
Nitrogen oxides are one of the main pollution sources causing atmospheric pollution, and besides acid rain, they also form photochemical smog and harm human health. However, the existing burner using fossil fuel cannot avoid nitrogen oxides (NO X) having chemical formulas of NO and NO 2 generated due to chemical reaction at the time of combustion. The industry has developed low NO X combustion technology for suppressing nitrogen oxides by improving the structure of a burner such as the mixing form of fuel and air, the air-fuel ratio, and the like.
There are two main types of low NO X burners currently in use. One is an air staged burner. The air staged burner divides combustion air into primary air and secondary air, so that fuel gas is combusted in a first combustion zone lean in oxygen, the formation of NO X is reduced, and then the fuel gas is combusted in a second combustion zone under the action of the secondary air. Another low NO X burner is a gas staged burner in which combustion air is introduced into the first combustion zone all at once, but only a portion of the fuel is combusted in the first combustion zone, and the remaining fuel is introduced into the second combustion zone separately, with the excess oxygen from the first combustion zone being used for combustion. In such a burner, the excess air in the first combustion zone dilutes the fuel, and the combustion temperature is lower, reducing the formation of NO X.
Flue Gas Recirculation (FGR) is another low NO X combustion method. Flue Gas Recirculation (FGR) is to recycle a portion of the burned flue gas back to the windbox, mix with fresh fuel and then return to the combustion zone with the fuel again. Flue Gas Recirculation (FGR) is the most efficient and structurally simpler system for reducing NO X for gas burners and can be used in combination with other low NO X methods. However, the external flue gas recirculation structure is complex, requires additional equipment, and is not economical as compared with the internal flue gas recirculation.
With the penetration of national energy conservation and emission reduction policies, some cities have required NO X emissions below 30mg/m 3. The above requirements are difficult to achieve by only one low nitrogen combustion technique, so the technical proposal adopted is to combine the techniques of air classification, fuel classification, built-in flue gas recirculation, etc.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a low-nitrogen cyclone gas burner with gas and air precisely grading and built-in flue gas recirculation, which can precisely grade the gas and air, improve the combustion efficiency and reduce the content of nitrogen oxides.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The device comprises a hearth, a furnace wall, and a central fuel conveying pipeline, a primary air channel and a mixing channel which are sequentially sleeved from inside to outside, wherein the front ends of the central fuel conveying pipeline, the primary air channel and the mixing channel penetrate through the furnace wall and extend into the hearth; the outer side wall of the mixing channel is provided with a plurality of sections of recycling channels, and the recycling channels are positioned in the hearth;
The front end of the central fuel conveying pipeline is provided with a central fuel spray head and a plurality of secondary fuel spray heads; a plurality of tertiary fuel guns and secondary air guns are uniformly arranged in the mixing channel at intervals, and the central fuel conveying pipeline and the tertiary fuel guns are connected with a fuel supply device; the primary air channel and the secondary air spray gun are both connected with an oxidant supply device.
Further, an inner refractory sleeve and an outer refractory sleeve are sleeved on the primary air channel in sequence from inside to outside, a gap is reserved between the inner refractory sleeve and the outer refractory sleeve, and the gap forms a mixing channel.
Further, the recirculation channels are uniformly arranged on the outer refractory sleeve along the circumferential direction, an included angle of 15-45 degrees is formed between the recirculation channels and the axis of the mixing channel in the axis direction, and the recirculation channels are tangential to the inner side wall of the mixing channel on the plane perpendicular to the axis; the front end parts of the three-stage fuel gun and the secondary air gun do not exceed the outlet of the recirculation channel.
Further, the front ends of the inner and outer refractory sleeves are flush and each split with a countersink.
Further, the front end of the three-stage fuel gun is a three-stage fuel spray head, the front end of the secondary air spray gun is a secondary air spray head, the three-stage fuel spray head and the secondary air spray head are identical in shape, and the front ends of the three-stage fuel spray head and the secondary air spray head are provided with a plurality of diversion channels for forming air curtain type injection fuel gas.
Further, a rotational flow device is arranged at the outlet of the primary air channel; the cyclone device is a cyclone with adjustable cyclone strength.
Further, the secondary fuel spray heads are uniformly arranged around the circumference of the central fuel spray head, and the secondary fuel spray heads are positioned at the rear side of the central fuel spray head; the secondary fuel spray nozzle comprises spray holes which are distributed along the axial direction and are obliquely arranged towards the swirling device.
Further, the central fuel nozzle is provided with a combustion stabilizing tooth and a blunt body reflux device.
Further, the fuel supply device is connected with a three-stage fuel collecting tank through a three-stage fuel conveying pipeline, and the three-stage fuel collecting tank is connected with a three-stage fuel gun; valves are arranged between the central fuel conveying pipeline and the fuel supply device and between the tertiary fuel conveying pipeline and the fuel supply device.
Further, the oxidant supply device is connected with the secondary air spray gun through a valve and a secondary air header.
Compared with the prior art, the invention has the following beneficial technical effects:
According to the invention, the central fuel conveying pipeline, the primary air channel and the mixing channel are arranged, so that air and fuel gas are distributed in three stages along the axial direction, the built-in recirculation channel is arranged, the initially combusted flue gas circulates at the bottom of the hearth, the built-in flue gas recirculation channel forms a rotational flow and is mixed with the three-stage fuel and the secondary air, and the oxygen concentration of the mixed gas is diluted, so that the formation of NO X is inhibited. Therefore, NO X is formed in an oxidizing initial combustion zone, is mixed with central fuel in a reburning zone and reduced, is thoroughly reduced in a burnout zone where secondary air and tertiary fuel are sprayed, and thoroughly burns unburned fuel and CO.
Furthermore, the inner and outer fireproof sleeves are arranged, so that the primary air, the secondary air and the smoke are separated, and the combustion stabilizing effect is exerted after combustion.
Furthermore, an included angle exists between the recirculation channel and the axis of the mixing channel, so that the flue gas can flow upwards after entering the mixing channel, and the energy loss of the outer wall of the inner refractory sleeve caused by direct vertical collision of the 90-degree flue gas is avoided; the recirculation channel is tangential to the mixing channel in the plane direction perpendicular to the axis, and the movement direction of the flue gas passing through the recirculation channel is tangential to the inner side wall of the mixing channel, so that the flue gas is prevented from losing part of kinetic energy due to collision to the outer wall of the inner refractory sleeve.
Furthermore, the conical flaring with the diameter gradually expanding towards the direction of going deep into the hearth along the axis of the burner is arranged at the front ends of the inner refractory sleeve and the outer refractory sleeve, so that the flue gas circulation is facilitated.
Furthermore, the three-stage fuel spray head and the secondary air spray head have the same shape, and the front ends of the three-stage fuel spray head and the secondary air spray head are provided with a plurality of diversion channels, so that air curtain type spray can be formed, and recycled flue gas is ejected.
Furthermore, the invention generates rotational flow through the rotational flow device by the secondary fuel and the primary air, and sprays the rotational flow into the hearth, a central backflow area of combustion products is formed in the hearth, unreacted air and fuel are preheated and diluted, and stable flame is formed under high-speed jet flow.
Further, the secondary fuel nozzle is arranged at the rear side of the central fuel nozzle, so that the axial staged combustion of the central fuel and the secondary fuel is realized; two-direction spray holes are arranged on the secondary fuel spray nozzle, and fuel gas is axially sprayed through one part of the secondary fuel spray nozzle and sprayed in the direction of one-time swirl wind in a part of the circumferential direction.
Furthermore, the invention ensures that central fuel gas forms reflux by arranging the fuel stabilizing teeth and the blunt body reflux device, thereby also sucking the flue gas for reflux and forming a small flue gas recirculation area.
Drawings
Fig. 1 is a front cross-sectional view of the present invention.
Fig. 2 is a top cross-sectional view of the present invention.
Fig. 3 (a) is a schematic view of a secondary fuel nozzle of the present invention, and fig. 3 (b) is a schematic view of an injection hole on the secondary fuel nozzle.
Fig. 4 (a) is a front view, fig. 4 (b) is a side view, and fig. 4 (c) is a top view of the three-stage fuel nozzle of the present invention.
Fig. 5 (a) is a front view of the center fuel nozzle of the present invention, and fig. 5 (b) is a plan view of the center fuel nozzle.
1-Center fuel delivery pipe, 2-oxidant feed, 3-tertiary fuel header, 4-overgrate air header, 5-furnace wall, 6-tertiary fuel gun, 7-tertiary fuel injector, 8-outer refractory sleeve, 9-mixing channel, 10-swirl device, 11-secondary fuel injector, 12-blunt body reflux unit, 13-center fuel injector, 14-inner refractory sleeve, 15-overgrate air injector, 16 overgrate air gun, 17-recirculation channel, 18-tertiary fuel delivery pipe, 19-header sleeve, 20-primary air sleeve, 21-valve, 22-fuel feed, 23-stable combustion tooth, 24-primary air channel, 25-orifice.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 to 5 (b), the invention comprises a hearth, a furnace wall 5, and a central fuel conveying pipeline 1, a primary air channel 24 and a mixing channel 9 which are sleeved in sequence from inside to outside, wherein the front ends of the central fuel conveying pipeline 1, the primary air channel 24 and the mixing channel 9 extend into the hearth through the furnace wall 5.
The front end of the central fuel conveying pipeline 1 is provided with a central fuel spray head 13 and a plurality of secondary fuel spray heads 11; a plurality of tertiary fuel guns 6 and secondary air guns 16 are arranged in the mixing channel 9 at intervals and uniformly. The tertiary fuel gun 6 is connected with a tertiary fuel conveying pipeline 18 through an annular tertiary fuel collecting box 3, fuel is uniformly supplied by the tertiary fuel annular collecting box 3, and the central fuel conveying pipeline 1 and the tertiary fuel conveying pipeline 18 are connected with a fuel supply device 22 through a valve 21; the secondary air spray gun 16 is connected with the secondary air collecting box 4, the primary air channel 24 is connected with the primary air sleeve 20, and the secondary air collecting box 4 and the primary air sleeve 20 are connected with the oxidant supply device 2 through the valve 21. The valve 21 is a solenoid valve.
Referring to fig. 2, the primary air passage 24 is provided with an inner refractory sleeve 14 and an outer refractory sleeve 8 in sequence from inside to outside, and a gap is left between the inner refractory sleeve 14 and the outer refractory sleeve 8, and the gap forms a mixing passage 9. The front ends of the inner refractory sleeve 14 and the outer refractory sleeve 8 are flush and are respectively provided with conical flares, namely the depth of penetration into a hearth is the same, and the inner refractory sleeve and the outer refractory sleeve are made of refractory materials such as AZS bricks, corundum bricks or direct-bonded magnesia chrome bricks. A plurality of sections of recirculation passages 17 are uniformly arranged on the side wall of the outer refractory sleeve 8 along the circumferential direction; the front end portions of the tertiary fuel guns 6 and the secondary air guns 16 do not exceed the outlets of the recirculation passages 17. The recirculation channel 17 is close to the furnace wall 5, as shown in fig. 1, the center line of the recirculation channel 17 has an included angle of 15-45 degrees along the axis z direction, so that the flue gas can flow upwards after entering the mixing channel 9, and the energy loss caused by the direct vertical collision of the flue gas with 90 degrees on the outer wall of the inner refractory sleeve 14 is avoided; in view of fig. 2, the direction of the center line of the recirculation channel 17 on the xy plane is tangential to the mixing channel 9, namely, the movement direction of the flue gas passing through the recirculation channel 17 is tangential to the inner side wall of the mixing channel 9, so that the flue gas is prevented from losing part of kinetic energy due to collision to the outer wall of the inner refractory sleeve 14.
The front end of the tertiary fuel gun 6 is a tertiary fuel spray head 7, the front end of the secondary air spray gun 16 is a secondary air spray head 15, the tertiary fuel spray head 7 and the secondary air spray head 15 are the same in shape, and special shapes are adopted, taking the tertiary fuel spray head 7 as an example, namely, a spray head with a flat rectangular outlet section and an outlet section rectangular area which are in transition from a circular pipe matched with the tertiary fuel gun 6 to a plurality of branch channels is arranged in the circular pipe, the area of the rectangular outlet section is smaller than the cross section of the circular pipe of the tertiary fuel gun 6, so that in-pipe gas forms gas curtain injection, and the gas curtain injection is arranged at the lower edge of the outlet of each recirculation channel 17, is uniformly distributed along the circumferential direction and is arranged at intervals with the secondary air spray gun 16.
The swirl device 10 is arranged at the outlet of the primary air channel 24; the cyclone device 10 is a cyclone with adjustable cyclone strength. The secondary fuel spray heads 11 are uniformly arranged circumferentially around the central fuel spray head 13; the secondary fuel nozzle 11 includes injection holes 25 arranged obliquely to the swirling device 10, and fuel gas is injected in a part of the axial direction and in a part of the circumferential direction against the primary swirling wind direction through the secondary fuel nozzle 11.
The central fuel nozzle 13 is provided with combustion stabilizing teeth 23 and a blunt body reflux device 12. The blunt body reflux device 12 is not limited to the tapered blunt body with axial holes shown in the drawings, but may be a reflux device formed of a blunt body of another shape such as a disk. The central fuel nozzle 13 protrudes more toward the furnace than the swirling device 10 and the secondary fuel nozzle 11, thereby realizing the axial staged combustion of the central fuel and the secondary fuel.
The invention can realize the accurate classification of fuel gas and air and the recirculation of built-in flue gas, and has the main working processes and principles that:
Referring to fig. 2, the gas sprayed from the secondary fuel spray head 11 along the circumferential direction is opposite to the primary swirl air, and the tertiary fuel sprayed from the tertiary fuel gun 6 and the secondary air sprayed from the secondary air spray gun 16 spray the recirculated flue gas, and the recirculated flue gas forms a swirl flow with the same direction as the primary air through the recirculation channel 17.
Referring to fig. 3 (a) and 3 (b), the longitudinal section of the secondary fuel nozzle 11 of the present invention is trapezoidal, so that a part of the fuel gas is injected axially, and a part of the fuel gas is injected circumferentially and mixed with the primary swirl air.
Referring to fig. 4 (a) to 4 (c), the tertiary fuel gun 6 and the secondary air gun 16 of the present invention change the in-pipe gas into air curtain type injection by a special structure and inject the recirculated flue gas. The nozzle cross-sectional area is smaller than the cross-sectional areas of the round tubes of the tertiary fuel guns 6 and the secondary air guns 16, thereby increasing the flow rate of the injection.
Referring to fig. 5 (a) and 5 (b), the center fuel nozzle 13 of the present invention is provided with a blunt body combustion stabilizing device at the center, a combustion stabilizing tooth 23 at the edge, and a plurality of small holes in the blunt body reflux device 12 in the axial direction, wherein the shapes of the combustion stabilizing tooth 23 and the blunt body can be varied, and are not limited to the one shown in the figures.
The invention provides a low NO X cyclone gas burner with fuel gas and air distributed along the axial three-stage by combining the fuel gas and air precise classification, built-in flue gas recirculation and cyclone combustion technology, namely, secondary fuel is firstly mixed and combusted with excessive primary air, NO X is formed in an oxidizing initial combustion area as an area A in fig. 1, central fuel is far deep into a hearth and is mixed with flue gas slowly, when the flue gas after the secondary fuel is combusted is mixed and combusted with the central fuel, generated NO X is reduced by hydrocarbons, CO and the like at high temperature, namely, is mixed and reduced in a reburning area as an area B in fig. 1, is thoroughly reduced in an over-fire area C in fig. 1, and thoroughly burns the unburning fuel and CO, and the flue gas reflux direction and the air flow direction are shown as arrows in fig. 1. The flue gas circulating at the bottom of the hearth forms a rotational flow through a built-in flue gas recirculation channel 17, and is mixed with tertiary fuel and secondary air, so that the oxygen concentration of the mixed gas is diluted, and the formation of NO X is inhibited. The secondary fuel and the primary air are sprayed into the hearth through the cyclone device 10 to form a central backflow area of combustion products in the hearth, the unreacted air and the fuel are preheated and diluted, and stable flame is formed under high-speed jet flow. The direction of the primary air rotating after passing through the cyclone device 10 is shown by an arc arrow in fig. 2, and the direction of the secondary fuel gas sprayed out is shown by a straight arrow in fig. 2, so that the secondary fuel gas is opposite to the cyclone direction of the primary air, and the secondary fuel gas is mixed with the primary air to facilitate ignition. The blunt body reflux device 12 and the combustion stabilizing teeth 23 in the central fuel nozzle 13 cause the central fuel gas to reflux, thereby also entraining the flue gas reflux and forming a small flue gas recirculation zone. The inner and outer fireproof sleeves not only separate primary air, secondary air and smoke, but also play a role in stable combustion after combustion. The invention can effectively improve the combustion condition, has high combustion efficiency and effectively reduces the concentration of nitrogen oxides.
Claims (8)
1. The low-nitrogen cyclone gas burner with the gas and air precisely-graded built-in flue gas recirculation is characterized in that: the device comprises a hearth, a furnace wall (5) and a central fuel conveying pipeline (1), a primary air channel (24) and a mixing channel (9) which are sleeved in sequence from inside to outside, wherein the front ends of the central fuel conveying pipeline (1), the primary air channel (24) and the mixing channel (9) penetrate through the furnace wall (5) and extend into the hearth; the outer side wall of the mixing channel (9) is provided with a plurality of sections of recycling channels (17), and the recycling channels (17) are positioned in the hearth;
The front end of the central fuel conveying pipeline (1) is provided with a central fuel spray head (13) and a plurality of secondary fuel spray heads (11); a plurality of tertiary fuel guns (6) and secondary air spray guns (16) are uniformly arranged in the mixing channel (9) at intervals, and the central fuel conveying pipeline (1) and the tertiary fuel guns (6) are connected with a fuel supply device (22); the primary air channel (24) and the secondary air spray gun (16) are connected with the oxidant supply device (2); in the axial direction, an included angle of 15-45 degrees is formed between the recirculation channel (17) and the axis of the mixing channel (9), and on the plane vertical to the axis, the recirculation channel (17) is tangential to the inner side wall of the mixing channel (9), and the front end parts of the three-stage fuel gun (6) and the secondary air spray gun (16) do not exceed the outlet of the recirculation channel (17); the secondary fuel spray heads (11) are uniformly arranged around the circumference of the central fuel spray head (13), and the secondary fuel spray heads (11) are positioned at the rear side of the central fuel spray head (13); the front end of the tertiary fuel gun (6) is a tertiary fuel spray head (7), the front end of the secondary air spray gun (16) is a secondary air spray head (15), the tertiary fuel spray head (7) and the secondary air spray head (15) are identical in shape, and the front ends of the tertiary fuel spray head and the secondary air spray head are provided with a plurality of diversion channels for forming air curtain type injection fuel gas.
2. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 1 wherein: an inner fireproof sleeve (14) and an outer fireproof sleeve (8) are sequentially sleeved on the primary air channel (24) from inside to outside, a gap is reserved between the inner fireproof sleeve (14) and the outer fireproof sleeve (8), and the gap forms a mixing channel (9).
3. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 2 wherein: the recirculation channels (17) are arranged uniformly on the outer refractory sleeve (8) along the circumferential direction.
4. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 2 wherein: the front ends of the inner fireproof sleeve (14) and the outer fireproof sleeve (8) are flush and are respectively provided with a conical flaring.
5. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 1 wherein: a rotational flow device (10) is arranged at the outlet of the primary air channel (24); the cyclone device (10) is a cyclone with adjustable cyclone strength.
6. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 5 wherein: the secondary fuel nozzle (11) comprises spray holes (25) which are distributed along the axial direction and are inclined towards the swirling device (10).
7. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 1 wherein: the fuel supply device (22) is connected with the three-stage fuel collection tank (3) through the three-stage fuel conveying pipeline (18), and the three-stage fuel collection tank (3) is connected with the three-stage fuel gun (6); valves are provided between the center fuel delivery pipe (1) and the fuel supply device (22) and between the three-stage fuel delivery pipe (18) and the fuel supply device (22).
8. The gas-air precisely staged internal flue gas recirculating low nitrogen cyclone gas burner of claim 1 wherein: the oxidant supply device (2) is connected with the secondary air spray gun (16) through a valve and the secondary air collection box (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892758.4A CN107606613B (en) | 2017-09-27 | 2017-09-27 | Low-nitrogen cyclone gas burner with gas-air precise grading and built-in flue gas recirculation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892758.4A CN107606613B (en) | 2017-09-27 | 2017-09-27 | Low-nitrogen cyclone gas burner with gas-air precise grading and built-in flue gas recirculation |
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| CN107606613A CN107606613A (en) | 2018-01-19 |
| CN107606613B true CN107606613B (en) | 2024-05-24 |
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| CN108730978B (en) * | 2018-05-18 | 2023-11-17 | 浙江炬烁热能设备制造有限公司 | Self-circulation low-nitrogen gas burner with adjustable flue gas in furnace |
| CN109631036B (en) * | 2019-01-14 | 2023-08-25 | 唐山亿昌热能科技有限公司 | Combustion method of ultralow nitrogen oxides, matched combustion head and combustion device |
| CN110107898B (en) * | 2019-05-30 | 2024-03-26 | 唐山金沙燃烧热能股份有限公司 | Coke oven gas low-nitrogen burner |
| CN111174204A (en) * | 2020-01-21 | 2020-05-19 | 无锡顺盟科技有限公司 | Low-nitrogen furnace internal reflux gas burner |
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| CN111780094A (en) * | 2020-07-17 | 2020-10-16 | 北京泷涛环境科技有限公司 | Deviating equivalence ratio ultra-low nitrogen combustion device and combustion method |
| CN112050215B (en) * | 2020-09-30 | 2023-11-03 | 江苏泷涛环境技术有限公司 | Using method of air multistage injection smoke internal circulation low-nitrogen combustor |
| CN113405095A (en) * | 2021-06-28 | 2021-09-17 | 清华大学山西清洁能源研究院 | Cyclone flue gas recirculation gas burner |
| CN115264493B (en) * | 2022-04-11 | 2024-09-27 | 华中科技大学 | Compact direct-current flameless low-nitrogen combustion device and control method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0893651A1 (en) * | 1997-07-22 | 1999-01-27 | Entreprise Generale De Chauffage Industriel Pillard | Burner for liquid and gaseous fuel with low nitric oxyde emission |
| CN104654306A (en) * | 2015-02-12 | 2015-05-27 | 海湾环境科技（北京）股份有限公司 | Low nitrogen oxide burner |
| CN105299651A (en) * | 2015-11-18 | 2016-02-03 | 上海齐耀热能工程有限公司 | Smoke internal circulation low-nitrogen combustor |
| CN105698172A (en) * | 2016-04-11 | 2016-06-22 | 徐州科融环境资源股份有限公司 | Petal-shaped staged combustion gas low-nitrogen combustor |
| CN105805746A (en) * | 2016-05-12 | 2016-07-27 | 徐州科融环境资源股份有限公司 | Classified-combustion fuel gas low-nitrogen combustor |
| CN205592955U (en) * | 2016-05-06 | 2016-09-21 | 北京佳德昌科技有限责任公司 | Tertiary air distribution's gas recirculation low NOx burner |
| CN205655293U (en) * | 2016-04-11 | 2016-10-19 | 徐州科融环境资源股份有限公司 | Petaloid fractional combustion gas low NOx burner |
| CN207527582U (en) * | 2017-09-27 | 2018-06-22 | 西安交通大学 | The low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2597367A4 (en) * | 2011-05-27 | 2014-10-29 | Shanghai Boiler Works Ltd | Dense-phase swirl pulverized coal burner |
-
2017
- 2017-09-27 CN CN201710892758.4A patent/CN107606613B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0893651A1 (en) * | 1997-07-22 | 1999-01-27 | Entreprise Generale De Chauffage Industriel Pillard | Burner for liquid and gaseous fuel with low nitric oxyde emission |
| CN104654306A (en) * | 2015-02-12 | 2015-05-27 | 海湾环境科技（北京）股份有限公司 | Low nitrogen oxide burner |
| CN105299651A (en) * | 2015-11-18 | 2016-02-03 | 上海齐耀热能工程有限公司 | Smoke internal circulation low-nitrogen combustor |
| CN105698172A (en) * | 2016-04-11 | 2016-06-22 | 徐州科融环境资源股份有限公司 | Petal-shaped staged combustion gas low-nitrogen combustor |
| CN205655293U (en) * | 2016-04-11 | 2016-10-19 | 徐州科融环境资源股份有限公司 | Petaloid fractional combustion gas low NOx burner |
| CN205592955U (en) * | 2016-05-06 | 2016-09-21 | 北京佳德昌科技有限责任公司 | Tertiary air distribution's gas recirculation low NOx burner |
| CN105805746A (en) * | 2016-05-12 | 2016-07-27 | 徐州科融环境资源股份有限公司 | Classified-combustion fuel gas low-nitrogen combustor |
| CN207527582U (en) * | 2017-09-27 | 2018-06-22 | 西安交通大学 | The low nitrogen rotational flow gas-fired combustor of flue gas recirculation built in gas-air Accurate Classification |
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