CN214009217U - Double-hot-reflux partially-premixed low-nitrogen combustor - Google Patents
Double-hot-reflux partially-premixed low-nitrogen combustor Download PDFInfo
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- CN214009217U CN214009217U CN202022456854.4U CN202022456854U CN214009217U CN 214009217 U CN214009217 U CN 214009217U CN 202022456854 U CN202022456854 U CN 202022456854U CN 214009217 U CN214009217 U CN 214009217U
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- 238000010992 reflux Methods 0.000 title claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 16
- 239000000446 fuel Substances 0.000 claims abstract description 123
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 239000011148 porous material Substances 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 4
- 239000011224 oxide ceramic Substances 0.000 claims 1
- 229910052574 oxide ceramic Inorganic materials 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 21
- 239000002737 fuel gas Substances 0.000 description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 11
- 239000000779 smoke Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000009987 spinning Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Gas Burners (AREA)
Abstract
The utility model discloses a low NOx burner is mixed in advance to two hot reflux parts, including draft tube, main fuel pipe, the fuel pipe on duty. The front part of the main fuel pipe is provided with an injection control baffle which is arranged around the periphery of the main fuel pipe to form an injection area. The front end of the outlet of the main fuel pipe is provided with an injection pipe, and the outlet of the injection pipe extends out of an injection area. The front part of the guide cylinder is provided with an on-duty fuel premixing cavity, and a main air channel is formed between the on-duty fuel premixing cavity and the guide cylinder. The front part of the on-duty fuel pipe is provided with a plurality of on-duty fuel nozzles which extend into the on-duty fuel premixing cavity. Value ofThe swirl disk, the first porous medium unit and the second porous medium unit are arranged in the class fuel premixing cavity from back to front, and the porosity of the first porous medium unit is smaller than that of the second porous medium unit. The utility model has the advantages of good adaptability and stable combustion, and solves the problem of low NOxThe contradiction between the great reduction of oxygen content in combustion and the combustion stability can be realized, and the low NO can be realizedxAnd (5) discharging.
Description
Technical Field
The utility model relates to a two hot reflux parts premix low NOx burner belongs to the combustion technology field.
Background
With the increasing environmental standard, the NOx emission needs to be further reduced to 15mg/Nm3Or even near zero emission. The NOx generated by burning gases such as natural gas and the like is mainly thermal type and rapid type, wherein the thermal type NOx accounts for 95 percent, and the inhibition of the generation of the thermal type NOx is a main way for reducing the NOx.
At present, in various low-nitrogen combustion technologies, the main measures are to reduce the flame combustion temperature, disperse the high-temperature region and reduce the residence time of the high-temperature region. The natural gas low-nitrogen combustion technology comprises flue gas recirculation, flue gas internal circulation, premixing lean combustion technology and the like. In the flue gas recirculation technology, in order to stabilize flame, a fuel-rich combustion and reflux area is mainly adopted to improve the stability of flame on duty, which brings about local high temperature and local high NOx generation rate, so that the improvement of the flame on duty stability and the reduction of NOx are contradictory, and the method is a main technical difficulty for further reducing NOx.
The mode of flue gas internal circulation is formed by air or fuel jet, and especially the fuel jet realizes the mixing of the fuel and high-temperature flue gas before ignition, can form local flameless combustion, and has obvious effects on ignition stability and NOx generation inhibition. However, achieving the combustion characteristics described above requires the formation of stable jet entrainment, mixing, and ignition sites. Chinese patent document CN 2078153 proposes to adopt the venturi principle to obtain fuel jet entrainment, which is easily affected by the large flow field in the furnace, and the entrainment back pressure at the root of the burner oscillates along with the fluctuation of the recirculation zone, resulting in rapid change of the entrainment amount, causing severe pulsation of combustion, even causing flameout. In order to solve the problems, chinese patent document CN 108738333 discloses that the jet injection region is buried in the hearth wall surface, but the problems of over-temperature of the outer wall of the hearth wall, difficult arrangement and the like are caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two hot reflux parts mix low NOx burner in advance utilizes flue gas inner loop backward flow heat heating mixed gas and oxidant, when reducing nitrogen oxide, the stable combustion. The injection baffle is utilized to maintain the pressure stability of the injected high-temperature flue gas, and meanwhile, the porous medium is adopted to combust to form lean fuel on-duty flame, thereby improving the stability of the on-duty flame and realizing NOxThe discharge is less than 15mg/Nm3(at 3.5% O)2As a reference).
The utility model discloses a following technical scheme realizes:
a double-hot-backflow partially-premixed low-nitrogen combustor can be arranged in a combustion chamber and comprises a guide cylinder and a fuel main pipe arranged in the center of the guide cylinder, wherein the front end of the fuel main pipe comprises an on-duty fuel pipe arranged in the center of the guide cylinder and a plurality of main fuel pipes uniformly arranged on the periphery of the guide cylinder; the front part of the main fuel pipe is provided with an injection control baffle which is arranged around the periphery of the main fuel pipe to form an injection area; the outlet of the main fuel pipe is a tapered port, an injection pipe is arranged at the front end of the tapered port, and the outlet of the injection pipe extends out of an injection area; an on-duty fuel premixing cavity is arranged at the front part of the guide cylinder, and a main air channel is formed between the outer wall of the on-duty fuel premixing cavity and the inner wall of the guide cylinder; the top of the front end of the on-duty fuel pipe is closed, a plurality of on-duty fuel nozzles are uniformly arranged on the wall surface of the front part of the on-duty fuel pipe along the circumference, and the front part of the on-duty fuel pipe provided with the on-duty fuel nozzles extends into the on-duty fuel premixing cavity; a swirl disc and a porous medium unit are arranged in the on-duty fuel premixing cavity from back to front, and the porous medium unit is arranged at the front end of the on-duty fuel premixing cavity to form an on-duty flame combustion carrier; the porous medium units comprise a first porous medium unit and a second porous medium unit which are sequentially arranged from back to front, and the porosity of the first porous medium unit is smaller than that of the second porous medium unit.
In the technical scheme, the main air channel is arranged at the air flow rate of 30-50 m/s.
In the above technical scheme, the swirl disk is arranged according to the swirl number greater than 0.35.
In the technical scheme, a flow equalizing pore plate is further arranged in the middle of the on-duty fuel premixing cavity and is arranged between the cyclone disc and the first porous medium unit, and the aperture ratio of the flow equalizing pore plate is 0.1-0.3.
In the technical scheme, the first porous medium unit and the second porous medium unit are both made of silicon carbide foam ceramic or alumina foam ceramic; the porosity of the first porous medium unit is more than or equal to 0.8, and the pore density is 20-40 PPI; the porosity of the second porous medium unit is more than or equal to 0.85, and the pore density is 10-20 PPI.
In the technical scheme, the on-duty fuel nozzles are axially arranged in a front group and a rear group along an on-duty fuel pipe to form a front group and a rear group of on-duty fuel nozzle groups, and the swirl disc is arranged between the front group and the rear group of on-duty fuel nozzle groups; each on-duty fuel nozzle group comprises a plurality of on-duty fuel nozzles which are uniformly arranged along the circumference.
The utility model has the advantages of it is following and beneficial effect:
the on-duty flame adopts a porous medium combustion technology, and the stable combustion range of the on-duty flame is expanded through the high heat storage and high radiation capacity of the porous medium framework, so that the adaptability and the combustion stability of the whole combustor can be ensured; the porous medium is adopted for lean combustion, so that the low-nitrogen combustion of the flame on duty can be realized; the application of two porous medium units with different porosities can avoid the tempering phenomenon; the main combustion air is sprayed into the combustion chamber at a high speed, a large backflow area is formed in the combustion chamber, smoke in the combustion chamber flows back to the position near the combustor, and the main fuel is quickly mixed with the main fuel through high-speed injection of the main fuel, so that flameless combustion of the main fuel is realized, and NO is greatly reducedXGenerating; the injection control baffle controls the injection of the main fuel, reduces the influence of smoke and wind environment fluctuation in the combustion chamber on the injection efficiency of the main fuel, and realizes double-heat reflux heating and reduction of oxygen partial pressure before mixing the main fuel gas and the main combustion-supporting gas, thereby ensuring stable and ultralow nitrogen combustion.
Drawings
Fig. 1 is a schematic structural view of a circulating nitrogen burner according to the present invention.
Fig. 2 is the utility model relates to a whirl disc structure schematic diagram: (a) a schematic perspective view; (b) a plan view.
In the figure: 1-a guide shell; 2-primary fuel pipe; 201-a tapered mouth; 202-ejector tube; 3-ejecting a control baffle; 4-fuel line on duty; 401-on-duty fuel jets; 5-a spinning disk; 6-on-duty fuel premixing cavity; 7-flow equalizing pore plate; 8-a first porous media element; 9-a second porous media element; 10-fuel header; 11-feed pipe.
Detailed Description
The following describes the embodiments and working processes of the present invention with reference to the accompanying drawings.
The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.
As shown in FIG. 1, the double hot reflux partial premix low-nitrogen combustor with an outlet arranged in a combustion chamber comprises a guide shell 1 and a fuel main pipe 10 arranged in the center of the guide shell 1. The fuel main pipe is provided with a feeding pipe 11, and the feeding pipe 11 is arranged according to the use condition, can be arranged on the side surface of the burner as shown in figure 1, and also can be arranged outside the bottom of the burner.
The fuel flow direction is front-back direction. The front end of the fuel main pipe 10 comprises an on-duty fuel pipe 4 arranged at the center of the guide shell 1 and a plurality of main fuel pipes 2 uniformly arranged at the periphery of the guide shell 1. The fuel gas is introduced into the fuel header 10 and then branched into the on-duty fuel gas and the main fuel gas through the on-duty fuel pipe 4 and the main fuel pipe 2, respectively.
The front part of the main fuel pipe 2 is provided with an injection control baffle 3, and the injection control baffle 3 surrounds the periphery of the main fuel pipe 2 to form an injection area. The injection control baffle 3 ensures that the pressure intensity of the injection area is kept relatively stable, so that the injection quantity of the main fuel is stable. The outlet of the main fuel pipe 2 is a tapered opening 201, the front end of the tapered opening 201 is provided with an injection pipe 202, and the outlet of the injection pipe 202 extends out of an injection area. Usually, the reducing opening 201 and the ejector pipe 202 are coaxially arranged, and the inner diameter of the ejector pipe 202 is larger than the inner diameter of the outlet of the reducing opening 201, so that the main fuel gas sprayed out from the reducing opening can completely pass through the ejector pipe 202 in a high-speed jet manner.
The front part of the guide shell 1 is provided with an on-duty fuel premixing cavity 6, and a main air channel is formed between the outer wall of the on-duty fuel premixing cavity 6 and the inner wall of the guide shell 1. The main air channel is arranged at an air flow rate of 30-50 m/s. Air enters the combustor through the guide shell 1, a part of air enters the on-duty fuel premixing cavity 6 to serve as on-duty flame combustion-supporting gas, and the rest of air serves as main combustion-supporting gas and is injected into the combustor through a main air channel between the on-duty fuel premixing cavity 6 and the outer wall of the on-duty fuel premixing cavity and the inner wall of the guide shell 1 at a high speed to form a suction backflow area.
The top of the front end of the on-duty fuel pipe 4 is closed, a plurality of on-duty fuel nozzles 401 are uniformly arranged on the wall surface of the front part of the on-duty fuel pipe 4 along the circumference, and the front part of the on-duty fuel pipe provided with the on-duty fuel nozzles extends into the on-duty fuel premixing cavity 6. The back part of the on-duty fuel premixing cavity 6 is provided with a cyclone disk 5, so that on-duty fuel gas is jetted into the on-duty fuel premixing cavity 6 in a jet mode through an on-duty fuel pipe nozzle 401, and is mixed with on-duty flame combustion-supporting gas under the swirling action of the cyclone disk 5 to form premixed gas. As an optimized technical scheme, the on-duty fuel nozzles 401 are axially arranged along the on-duty fuel pipe 4 to form a front on-duty fuel nozzle group and a rear on-duty fuel nozzle group, each group of the front on-duty fuel nozzle group and the rear on-duty fuel nozzle group comprises a plurality of on-duty fuel nozzles, and the swirl disc 5 is arranged between the front on-duty fuel nozzle group and the rear on-duty fuel nozzle group, so that the on-duty fuel and the on-duty flame combustion-supporting gas are rapidly mixed.
The spinning disk 5 comprises a plurality of spinning blades, as shown in fig. 2, the spinning number of the spinning disk is:
wherein R is1Is the inner radius of the swirl vane, R2Is the outer radius of the rotational flow blade, and beta is the included angle between the rotational flow blade and the axial direction. In this case, the rotational flowThe discs 5 are arranged according to a swirl number of more than 0.35.
The middle part of the on-duty fuel premixing cavity 6 is also provided with a flow equalizing pore plate 7, the flow equalizing pore plate 7 is arranged between the swirling disc 5 and the first porous medium unit 8, and the aperture ratio of the flow equalizing pore plate 7 is 0.1-0.3. The pre-mixed gas is uniformly distributed in the pre-mixing cavity 6 by the flow equalizing effect of the flow equalizing pore plate 7.
The front end of the on-duty fuel premixing cavity 6 is provided with an on-duty flame combustion carrier formed by a porous medium unit. The porous medium units comprise a first porous medium unit 8 and a second porous medium unit 9 which are arranged from back to front in sequence, and the first porous medium unit 8 and the second porous medium unit 9 are both made of silicon carbide foamed ceramics or alumina foamed ceramics; the porosity of the first porous medium unit 8 is more than or equal to 0.8, and the pore density is 20-40 PPI; the porosity of the second porous medium unit 9 is more than or equal to 0.85, and the pore density is 10-20 PPI. And the porosity of the first porous medium unit 8 is smaller than the porosity of the second porous medium unit 9.
The porous medium unit satisfies: the first porous medium unit Pe is less than 65, and the second porous medium unit Pe is more than or equal to 65, so that the on-duty flame is stabilized between the second porous medium unit or the first porous medium and the second porous medium and is quenched in the first porous medium, and the on-duty fuel gas is prevented from refluxing to form tempering. Pe (peclet number) is:
wherein S isLIs the laminar flame speed, dmCharacteristic pore diameter for porous media, cpIs the specific heat capacity, ρ, of the premixed gasgIs the density, lambda, of the premixed gasgIs the thermal conductivity of the premixed gas.
The premixed gas is subjected to flow equalization through the flow equalization pore plate 7 to enable the velocity distribution of the premixed gas to be uniform, then the premixed gas is preheated in the first porous medium unit 8 and is ignited to finally form on-duty flame in the second porous medium unit 9 and the outlet face of the second porous medium unit, and the on-duty flame can also be formed between the first porous medium unit and the second porous medium unit.
The main fuel gas is ejected from the reducing port 201 through the main fuel pipe 2 to form high-speed jet flow, and the high-temperature flue gas in the injection control baffle 3 is sucked and entrained, mixed with the fuel in the injection pipe 202, enters the combustion chamber under the steady flow action of the injection pipe 202 and the injection control baffle 3, is mixed with the main combustion-supporting gas, and is ignited by the on-duty flame to generate the high-temperature flue gas. Main combustion-supporting gas continuously enters the combustion chamber through the main air channel in a high-speed injection mode to form a large backflow area, high-temperature flue gas in the entrainment combustion chamber flows back to the position near the combustor to promote mixing of the high-temperature flue gas and main fuel gas, backflow heat improves the temperature of the main fuel gas and the main combustion-supporting gas mixed subsequently, and oxygen partial pressure of high-temperature mixed gas is reduced. Meanwhile, the high-speed airflow formed by the main fuel gas sprayed from the tapered opening 201 can inject smoke, so that the high-temperature smoke, the smoke mixed fuel and the main combustion-supporting gas can be quickly mixed, and low-nitrogen flameless combustion is realized. The throat 201 of the main fuel pipe is positioned in the injection control baffle, so that the injection smoke of the main fuel gas is not influenced by the smoke environment in the combustion chamber, and the injection efficiency is ensured. In addition, the backflow area in the combustion chamber is compressed near the nozzle of the combustor to converge near the center, a virtual stagnation flame stabilizing surface of the on-duty flame is formed, and combustion under the combustion stabilizing effect of the on-duty flame is realized. The main fuel gas high-speed jet flow continuously entering is quickly and uniformly mixed, and simultaneously low-nitrogen combustion is realized under the combustion stabilizing effect of the on-duty flame.
The fuel gas amount on duty is 5% -15% of the fuel gas amount. The equivalence ratio of the on-duty fuel gas and the on-duty flame combustion-supporting gas in the on-duty fuel premixing cavity 6 is less than 1, and is usually 0.6-0.95. The flame on duty is in a lean fuel combustion state, and the sufficient and stable combustion of the fuel on duty is ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A double-hot-backflow partially-premixed low-nitrogen combustor capable of being arranged in a combustion chamber is characterized by comprising a guide cylinder (1) and a fuel main pipe (10) arranged in the center of the guide cylinder (1), wherein the front end of the fuel main pipe (10) comprises an on-duty fuel pipe (4) arranged in the center of the guide cylinder (1) and a plurality of main fuel pipes (2) uniformly arranged on the periphery of the guide cylinder (1); an injection control baffle (3) is arranged at the front part of the main fuel pipe (2), and the injection control baffle (3) is arranged around the periphery of the main fuel pipe (2) to form an injection area; an injection pipe (202) is arranged at the front end of the outlet of the main fuel pipe (2), and the outlet of the injection pipe (202) extends out of an injection area; an on-duty fuel premixing cavity (6) is arranged at the front part of the guide shell (1), and a main air channel is formed between the outer wall of the on-duty fuel premixing cavity (6) and the inner wall of the guide shell (1); the top of the front end of the on-duty fuel pipe (4) is closed, a plurality of on-duty fuel nozzles (401) are arranged on the wall surface of the front part of the on-duty fuel pipe (4), and the front part of the on-duty fuel pipe provided with the on-duty fuel nozzles extends into the on-duty fuel premixing cavity (6); a swirl disc (5) and a porous medium unit are arranged in the on-duty fuel premixing cavity (6) from back to front, and the porous medium unit is arranged at the front end of the on-duty fuel premixing cavity (6) to form an on-duty flame combustion carrier; the porous medium unit comprises a first porous medium unit (8) and a second porous medium unit (9) which are sequentially arranged from back to front, and the porosity of the first porous medium unit (8) is smaller than that of the second porous medium unit (9).
2. The double hot-backflow partially-premixed low-nitrogen burner as claimed in claim 1, wherein a tapered opening (201) is selected as an outlet of the main fuel pipe (2), and the injection pipe (202) is arranged at the front end of the tapered opening (201).
3. The dual hot-return partially-premixed low-NOx burner of claim 1, wherein the main air channel is provided at an air flow rate of 30-50 m/s.
4. The dual hot-flow partially premixed low nitrogen burner according to claim 1, wherein said swirl disk (5) is arranged according to a swirl number greater than 0.35.
5. The double hot reflux partially premixed low-nitrogen burner according to claim 1, wherein a flow equalizing pore plate (7) is further disposed in the middle of the on-duty fuel premixing chamber (6), the flow equalizing pore plate (7) is disposed between the swirling disk (5) and the first porous medium unit (8), and the aperture ratio of the flow equalizing pore plate (7) is 0.1-0.3.
6. The dual hot-return partially-premixed low-nitrogen burner according to claim 1, wherein the first porous medium unit (8) and the second porous medium unit (9) are made of silicon carbide ceramic foam or aluminum oxide ceramic foam; the porosity of the first porous medium unit (8) is more than or equal to 0.8, and the pore density is 20-40 PPI; the porosity of the second porous medium unit (9) is more than or equal to 0.85, and the pore density is 10-20 PPI.
7. The dual hot-runner partially-premixed low NOx burner of claim 1, wherein the on-duty fuel nozzle (401) is disposed in two front and rear groups along the axial direction of the on-duty fuel pipe (4) to form two front and rear groups of on-duty fuel nozzles, and the swirl disk (5) is disposed between the two front and rear groups of on-duty fuel nozzles; each on-duty fuel nozzle group comprises a plurality of on-duty fuel nozzles (401) which are uniformly arranged along the circumference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022456854.4U CN214009217U (en) | 2020-10-29 | 2020-10-29 | Double-hot-reflux partially-premixed low-nitrogen combustor |
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| CN202022456854.4U CN214009217U (en) | 2020-10-29 | 2020-10-29 | Double-hot-reflux partially-premixed low-nitrogen combustor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113218A (en) * | 2020-10-29 | 2020-12-22 | 清华大学 | Double-hot-reflux partially-premixed low-nitrogen combustor and combustion method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113218A (en) * | 2020-10-29 | 2020-12-22 | 清华大学 | Double-hot-reflux partially-premixed low-nitrogen combustor and combustion method thereof |
| CN112113218B (en) * | 2020-10-29 | 2024-06-18 | 清华大学 | Double-thermal-reflux partially-premixed low-nitrogen combustor and combustion method thereof |
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