CN110345478B - Flameless burner with oscillating cavity flame stabilizing device - Google Patents
Flameless burner with oscillating cavity flame stabilizing device Download PDFInfo
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- CN110345478B CN110345478B CN201910666893.6A CN201910666893A CN110345478B CN 110345478 B CN110345478 B CN 110345478B CN 201910666893 A CN201910666893 A CN 201910666893A CN 110345478 B CN110345478 B CN 110345478B
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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
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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
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
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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
- F23D14/46—Details, e.g. noise reduction means
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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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/66—Preheating the combustion air or gas
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
The invention belongs to the field of burners, and particularly discloses a flameless burner with an oscillating cavity flame stabilizing device. The outlet of the central gas jet pipe of the flameless combustor is connected with the oscillation cavity and used for providing gas; the air adjusting spray pipes are symmetrically arranged at two sides of the oscillation cavity and used for providing air for the on-duty flame formed by combustion of fuel gas in the oscillation cavity; the oscillation cavity excites the residual gas after the on-duty flame burns by using the oscillation action to form oscillation jet flow and then the oscillation jet flow is ejected; the air rotational flow spray pipe is nested outside the oscillation cavity and used for providing rotational flow air in the preheating stage; the air direct injection lances are arranged in parallel and symmetrically outside the central gas lance for supplying air during the flameless combustion phase. According to the invention, the oscillating cavity is arranged, so that oscillating jet flow can be formed, the uniform distribution of fuel gas in the hearth can be ensured, and the on-duty flame can be formed in the oscillating cavity, so that the flameout problem during the switching between the preheating stage and the flameless combustion stage can be avoided.
Description
Technical Field
The invention belongs to the field of burners, and particularly relates to a flameless burner with an oscillating cavity flame stabilizing device.
Background
In recent years, haze weather frequently appearing in China frequently harms people's health, so that the air quality problem is widely concerned. Among them, nitrogen oxide is one of the fierce and violent in haze weather, so nitrogen oxide emission reduction is becoming the key point of government environmental protection work. The low-nitrogen combustion technology used in the industry at present mainly comprises a staged combustion technology, a flue gas recirculation technology and a premixed combustion technology, and the technologies have the problems of limited emission reduction effect, incapability of simultaneously considering high efficiency, cleanness and the like, and have gap with increasingly strict environmental protection requirements. Meanwhile, flameless combustion (MILD) is widely concerned by the international combustion world because it well balances the goals of high efficiency and Low pollution.
Flameless combustion requires heating the furnace chamber by a flame combustion mode to make the combustion air temperature reach the self-ignition temperature of the fuel, and then switching to flameless combustion. In order to realize the process, modes of preheating outside the furnace, using a heat accumulator for preheating, using a catalyst for reducing the self-ignition point, mixing and preheating the smoke in the furnace and the like can be utilized. Based on the principle that a catalyst can reduce the requirement of the ignition concentration of fuel, CN201710893746.3 provides a catalytic flameless combustion device, the device uses small flame to preheat firstly, and then switches to flameless combustion by increasing the flow rate of fuel gas and air, but the problems of unstable switching process, high catalyst cost and the like exist, CA2240411C provides a flameless combustor, a catalytic surface is arranged in a combustion chamber to reduce the self-ignition point of the fuel, the ignition of the flameless combustion is facilitated, but the problems of complex structure and increased operation cost exist. Based on the principle of mixing and preheating flue gas in the furnace, CN201610512122.8 proposes a heat exchange type flameless combustion furnace and a flameless combustion control method, wherein the back flow of the flue gas is promoted by a gradually expanding furnace to promote the mixing in the furnace, but the problem of combustion stability when the preheating stage and the flameless combustion stage are switched is still not solved.
Disclosure of Invention
In view of the above defects or improvement requirements of the prior art, the present invention provides a flameless burner with an oscillation cavity flame stabilization device, wherein the oscillation cavity is arranged, and the structure and the specific arrangement mode of the oscillation cavity are researched and designed, so that the flameout problem which may occur when the preheating stage and the flameless combustion stage of the flameless burner are switched can be effectively solved, and the flameless burner is particularly suitable for the application occasions of flameless combustion.
In order to achieve the above object, the present invention provides a flameless burner with an oscillating chamber flame stabilizer, comprising a central gas nozzle, an oscillating chamber, an air-conditioning nozzle, an air swirling nozzle and an air direct-injection nozzle, wherein:
the outlet of the central gas spray pipe is connected with the oscillation cavity and used for providing gas for the oscillation cavity;
the air adjusting spray pipes are symmetrically arranged on two sides of the oscillating cavity and used for providing air for the on-duty flame formed by combustion of the fuel gas in the oscillating cavity;
the oscillation cavity excites the residual gas after the on-duty flame burns by using oscillation action to form oscillation gas and jet the oscillation gas, and meanwhile, the on-duty flame in the oscillation cavity plays a role of stabilizing fire when the preheating stage and the flameless combustion stage are switched;
the air rotational flow spray pipe is nested outside the oscillation cavity and used for conveying and spraying air in a preheating stage, meanwhile, a loop outlet of the air rotational flow spray pipe is parallel to an outlet of the oscillation cavity, rotational flow blades are uniformly arranged between the loop outlet and the oscillation cavity along the circumferential direction and used for driving the air to rotate along the central axis of the flameless combustor so as to spray rotational flow air;
the air direct injection lances are arranged in parallel and symmetrically outside the central gas lance for delivering and injecting air during the flameless combustion phase.
Further preferably, the diameter ratio of the central gas nozzle to the oscillation cavity is preferably 0.2-0.5.
Further preferably, the ratio of the length to the diameter of the oscillation cavity is greater than or equal to 1.5-5.
As a further preferred, the outlet of the oscillation cavity is provided with a wedge-shaped baffle for sucking the flue gas in the hearth, and a backflow is formed inside the oscillation cavity.
Preferably, the flameless burner further comprises a blunt body, the blunt body is arranged at an outlet of the oscillation cavity and connected with the central gas nozzle through a connecting rod, and during operation, gas in the hearth flows back at the blunt body, so that the gas and air are uniformly mixed.
Preferably, the flameless combustor further comprises a gas adjusting nozzle symmetrically arranged at an outlet of the central gas nozzle and used for adjusting the shape of gas sprayed from the central gas nozzle and the reaction state in the cavity of the oscillation cavity.
More preferably, the outlet flow speed of the air swirling nozzle is 15 m/s-30 m/s in the preheating stage, and the outlet flow speed of the air direct injection nozzle is 70 m/s-150 m/s in the flameless combustion stage.
Further preferably, the outlet flow speed of the central gas nozzle is 8-30 m/s.
More preferably, the number of the direct air injection nozzles is preferably 2 to 4.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. according to the invention, the oscillation cavity is arranged at the outlet of the central gas jet pipe, and the air adjusting jet pipes are arranged on two sides of the oscillation cavity, so that the gas can be excited by utilizing the oscillation action to form oscillation gas jet flow, the uniform distribution of the gas in the hearth can be ensured, and the on-duty flame can be formed in the oscillation cavity, so that the flameout problem possibly occurring in the process of switching between the preheating stage and the flameless combustion stage can be avoided, the stability and the combustion safety of the flameless combustor can be improved, and the reduction atmosphere rich in fuel and poor in oxygen in the oscillation cavity can be used for avoiding the generation of a large amount of NOx caused by the combustion of the on-duty;
2. particularly, the invention can ensure the establishment of the oscillation gas jet flow by optimizing the specific parameters of the oscillation cavity, and can suck the flue gas in the hearth by arranging the wedge-shaped baffle at the outlet of the oscillation cavity, thereby supplementing the oxygen required by the on-duty flame combustion in the oscillation cavity;
3. meanwhile, the blunt body is arranged at the outlet of the oscillation cavity, and the fuel gas in the hearth reflows at the blunt body, so that the fuel gas is more fully contacted with air, the stability of flame is improved, and the flameout problem in the process of switching the preheating stage and the flameless combustion stage is avoided;
4. in addition, the invention can respectively meet the combustion conditions of the preheating stage and the flameless combustion stage by optimizing the outlet flow velocity of the central gas spray pipe, the air rotational flow spray pipe and the air direct injection spray pipe, thereby rapidly and stably realizing mode switching.
Drawings
FIG. 1 is a flameless combustor with an oscillating chamber flame holding apparatus constructed in accordance with a preferred embodiment of the present invention;
3 FIG. 3 2 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 the 3 plane 3 A 3- 3 A 3 in 3 FIG. 3 1 3 when 3 the 3 number 3 of 3 direct 3 air 3 injection 3 lances 3 is 3 2 3; 3
3 FIG. 3 3 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 the 3 plane 3 A 3- 3 A 3 in 3 FIG. 3 1 3 when 3 the 3 number 3 of 3 the 3 direct 3 air 3 injection 3 lances 3 is 3 3 3; 3
3 fig. 3 4 3 is 3 a 3 sectional 3 view 3 of 3 the 3 plane 3 a 3- 3 a 3 in 3 fig. 3 1 3 when 3 the 3 number 3 of 3 the 3 direct 3 air 3 injection 3 lances 3 is 3 4 3. 3
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the gas jet nozzle comprises a central gas jet pipe 1, an oscillation cavity 2, a blunt body 3, an air direct jet pipe 4, a blade 5, an air rotational flow jet pipe 6, a gas adjusting jet pipe 7 and an air adjusting jet pipe 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the preferred embodiment of the present invention provides a flameless burner with an oscillating cavity flame-stabilizing device, which comprises a central gas nozzle 1, an oscillating cavity 2, an air-conditioning nozzle 8, an air swirl nozzle 6 and an air direct-injection nozzle 4, wherein:
the outlet of the central gas jet pipe 1 is connected with the oscillation cavity 2 and is used for providing gas for the oscillation cavity 2;
the air adjusting spray pipes 8 are symmetrically arranged on two sides of the oscillation cavity 2 and are used for providing air for the on-duty flame formed by combustion of fuel gas in the oscillation cavity 2, and the problem of combustion stability during switching between a preheating stage and a flameless combustion stage can be effectively solved due to the on-duty flame;
the oscillation cavity 2 excites the rest gas after the on-duty flame burns by using the oscillation action to form oscillation gas and spray the oscillation gas, and the oscillation gas is fully mixed with air and then burnt, so that the gas distribution in the hearth is ensured to be more uniform, meanwhile, the on-duty flame in the oscillation cavity 2 can play a role of stabilizing the fire when the preheating stage and the flameless combustion stage are switched, the flameout problem is avoided, and the stability of the burner is improved, in addition, a wedge-shaped baffle plate is arranged at the outlet of the oscillation cavity 2 and used for sucking the smoke in the hearth, and backflow is formed in the oscillation cavity 2 to supplement the oxygen required by the on-duty flame combustion;
the air rotational flow spray pipe 6 is nested outside the oscillation cavity and used for conveying and spraying air in a preheating stage, meanwhile, a loop outlet of the air rotational flow spray pipe 6 is parallel to an outlet of the oscillation cavity 2, rotational flow blades 5 are uniformly arranged between the loop outlet and the oscillation cavity 2 along the circumferential direction and used for driving the air to rotate along the central axis of the flameless combustor so as to spray rotational flow air;
the direct air injection lances 4 are arranged parallel and symmetrically outside the central gas lance 1 for delivering and injecting air during the flameless combustion phase.
Further, the diameter ratio of the central gas nozzle 1 to the oscillating cavity 2 is preferably 0.2-0.5, the influence on the formation of the oscillating gas caused by the excessively small or large inlet sectional area of the oscillating cavity 2 is avoided, and the length ratio of the oscillating cavity 2 to the diameter ratio is preferably 1.5-5, so that a suitable excitation condition is provided for the formation of the oscillating gas.
Further, flameless combustor still includes bluff body 3, and bluff body 3 sets up the export at oscillation cavity 2 to be connected with central gas spray tube 2 through the connecting rod, the gas in the during operation furnace produces the backward flow in bluff body 3 department, thereby makes gas and air contact more abundant, and then improves the stability of burning, avoids preheating the in-process that stage and flameless combustion stage switched and appears flame-out problem.
Further, flameless combustor still includes gas adjusting nozzle 7, and gas adjusting nozzle 7 symmetry sets up the export at central gas spray tube 1 for adjusting central gas spray tube 1 and spraying the gas shape, thereby adjustment central gas spray tube 1 sprays the divergence angle of gas, is favorable to improving subsequent oscillation and mixing effect, realizes the regulation to the intracavity reaction state of oscillation cavity 2.
Further, the preheating stage has low requirement on the speed of the injected air, so the outlet flow speed of the air swirling nozzle 6 is preferably 15 m/s-30 m/s, the flameless combustion stage ensures that the injected air has high momentum so as to stir the whole hearth, the outlet flow speed of the air direct injection nozzle 4 is preferably 70 m/s-150 m/s, and further large-scale entrainment required by flameless combustion is realized, and the outlet flow speed of the central gas nozzle 1 is preferably 8 m/s-30 m/s in the preheating stage and the flameless combustion stage.
Further, as shown in fig. 2 to 4, the number of the direct air injection nozzles 4 is preferably 2 to 4, and fig. 2, 3, and 4 are distribution diagrams when the number of the direct air injection nozzles 4 is 2, 3, and 4, respectively.
The following describes the operation of the flameless burner with the oscillating chamber flame stabilizing device according to the preferred embodiment of the present invention:
in the oscillation cavity 2, the gas provided by the central gas nozzle 1, the air provided by the air adjusting nozzle 8 and the sucked air outside the cavity are mixed and combusted to form stable on-duty flame, the combustion process of a preheating stage and a flameless combustion stage in a hearth is not influenced, and the on-duty flame can be prevented from generating a large amount of NOx because the inside of the oscillation cavity 2 is in a fuel-rich low-oxygen reducing atmosphere, and the on-duty flame can be prevented from extinguishing when the preheating stage and the flameless combustion stage are switched, so that the stability of the flameless combustor is improved;
in the preheating stage, the air passes through the entering of air whirl spout 6, from loop outlet blowout whirl air admission furnace under the effect of blade 5, mix the postcombustion with 2 spun oscillation efflux gas of oscillation cavity, the oscillation efflux of gas and the backward flow of bluff body department, the whirl of air has all increased the area of contact and the gas of gas with the air in addition, thereby effectively improved the heating efficiency in the preheating stage, treat that furnace reaches the gas spontaneous combustion temperature after, directly spout the air into furnace through air directly spout 4, directly spout the quantity regulation exit velocity of spout 4 according to the air, thereby switch to flameless combustion stage.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a take flameless combustor of steady fire device of oscillating chamber which characterized in that, this flameless combustor includes central gas spray tube (1), oscillating chamber body (2), air condition spray tube (8), air whirl spray tube (6) and air and directly spouts spray tube (4), wherein:
the outlet of the central gas spray pipe (1) is connected with the oscillation cavity (2) and is used for providing gas for the oscillation cavity (2);
the air adjusting spray pipes (8) are symmetrically arranged on two sides of the oscillating cavity (2) and are used for providing air for the on-duty flame formed by combustion of the fuel gas in the oscillating cavity (2);
the oscillation cavity (2) excites the residual gas after the on-duty flame burns by utilizing the oscillation action so as to form oscillation gas and spray the oscillation gas, and meanwhile, the on-duty flame in the oscillation cavity (2) plays a role of stabilizing fire when the preheating stage and the flameless combustion stage are switched;
the air rotational flow spray pipe (6) is nested outside the oscillation cavity and used for conveying and spraying air in a preheating stage, meanwhile, a loop outlet of the air rotational flow spray pipe (6) is parallel to an outlet of the oscillation cavity (2), and rotational flow blades (5) are uniformly arranged between the loop outlet and the oscillation cavity (2) along the circumferential direction and used for driving the air to rotate along the central axis of the flameless combustor so as to spray rotational flow air;
the air direct injection nozzles (4) are arranged in parallel and symmetrically outside the central gas nozzle (1) and are used for conveying and injecting air in the flameless combustion stage.
2. The flameless burner with an oscillating cavity flame stabilizing device according to claim 1, wherein the ratio of the diameters of the central gas nozzle (1) and the oscillating cavity (2) is 0.2-0.5.
3. The flameless burner with the oscillating chamber flame stabilizing device according to claim 1, wherein the ratio of the length to the diameter of the oscillating chamber (2) is 1.5-5.
4. The flameless combustor with the oscillating chamber flame stabilization device according to any one of claims 1 to 3, wherein the outlet of the oscillating chamber (2) is provided with a wedge-shaped baffle for sucking the flue gas in the furnace chamber and forming a backflow in the oscillating chamber (2).
5. The flameless burner with the oscillating cavity flame stabilizing device according to claim 1, further comprising a blunt body (3), wherein the blunt body (3) is disposed at an outlet of the oscillating cavity (2) and is connected and fixed with the central gas nozzle (2) through a connecting rod, and during operation, gas in the furnace chamber flows back at the blunt body (3), so that the gas and air are uniformly mixed.
6. The flameless burner with the oscillation cavity flame stabilization device according to claim 1, further comprising a gas adjusting nozzle (7), wherein the gas adjusting nozzle (7) is symmetrically disposed at an outlet of the central gas nozzle (1) and is used for adjusting a shape of gas ejected from the central gas nozzle (1) and an intra-cavity reaction state of the oscillation cavity (2).
7. The flameless burner with an oscillating chamber flame holding device according to claim 1, wherein the outlet flow rate of the air swirling nozzle (6) is 15m/s to 30m/s in the preheating stage, and the outlet flow rate of the air direct injection nozzle (4) is 70m/s to 150m/s in the flameless combustion stage.
8. The flameless burner with an oscillating chamber flame holding device according to claim 1, wherein the outlet flow velocity of the central gas nozzle (1) is 8m/s to 30 m/s.
9. The flameless burner with an oscillating chamber flame holding device according to any one of claims 5 to 8, wherein the number of the air direct injection lances (4) is 2 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910666893.6A CN110345478B (en) | 2019-07-23 | 2019-07-23 | Flameless burner with oscillating cavity flame stabilizing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910666893.6A CN110345478B (en) | 2019-07-23 | 2019-07-23 | Flameless burner with oscillating cavity flame stabilizing device |
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| CN110345478A CN110345478A (en) | 2019-10-18 |
| CN110345478B true CN110345478B (en) | 2020-05-19 |
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| CN111780106B (en) * | 2020-06-30 | 2022-07-12 | 武汉钢铁有限公司 | Flameless burner of steel rolling heating furnace and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5618173A (en) * | 1994-12-15 | 1997-04-08 | W.R. Grace & Co.-Conn. | Apparatus for burning oxygenic constituents in process gas |
| SI2118565T2 (en) * | 2007-02-02 | 2020-01-31 | Messer Austria Gmbh | Burner |
| CN101968220B (en) * | 2010-10-28 | 2012-01-11 | 河北工业大学 | Low nitrogen oxide burning process as well as burning device and application |
| CN102944015B (en) * | 2012-10-29 | 2015-09-09 | 中国科学技术大学 | A kind of injection preheating type flameless burner |
| CN103727535B (en) * | 2014-01-16 | 2016-01-20 | 北京大学 | A kind of diagonal flow type normal temperature flameless burner |
| CN203687035U (en) * | 2014-02-20 | 2014-07-02 | 北京大学 | Inner rotational flow and outer straight flow flameless burner |
| CN204786409U (en) * | 2015-07-08 | 2015-11-18 | 北京大学 | Gas flameless burner that can multistage regulatory work rate |
| CN104990078B (en) * | 2015-07-20 | 2017-11-17 | 北京大学 | A kind of burner that can quickly realize flameless combustion |
| CN205090378U (en) * | 2015-11-04 | 2016-03-16 | 北京大学 | Flameless burner of low resistance |
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