CN105114951A - Tail edge backflow dual-classification low-nitrogen-oxygen gas burner - Google Patents
Tail edge backflow dual-classification low-nitrogen-oxygen gas burner Download PDFInfo
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- CN105114951A CN105114951A CN201510520158.6A CN201510520158A CN105114951A CN 105114951 A CN105114951 A CN 105114951A CN 201510520158 A CN201510520158 A CN 201510520158A CN 105114951 A CN105114951 A CN 105114951A
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- backflow
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- oxygen 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
Abstract
The invention provides a tail edge backflow dual-classification low-nitrogen-oxygen gas burner which comprises an air box assembly. A smoke backflow fin ring is arranged at the upper end of the air box assembly. A center gas nozzle is arranged in a center air channel in the air box assembly and provided with a rotational flow flame holder. A coaxial air adjusting barrel is installed at the upper portion of the air box assembly. A coaxial cold air barrel is arranged at the lower end of the center gas nozzle. A combustion-supporting air distribution barrel is arranged at the lower portion of the air box assembly. A gas inlet is formed in the center of the bottom of the air box assembly. Constant-temperature combustion-supporting air inlets are formed in the two sides of the gas inlet and a high-temperature combustion-supporting air inlet is formed in one side. Under the same working condition, when the tail edge backflow dual-classification low-nitrogen-oxygen gas burner of the structure is adopted for reaching the standard of CO emission, the content of NOx can be reduced by over 65% compared with that of a conventional burner. When the temperature of combustion-supporting air is 270 DEG C, the emission amount of NOx can be reduced to average 138 mg/Nm<3> from 400 mg/Nm<3>.
Description
Technical field
The invention belongs to technical field of burner, particularly relate to the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow that combustion air is high temperature.
Background technology
Low nitrogen oxygen gas burner is the class burner occurred to reduce discharged nitrous oxides in combustion product, and after heating furnace improves thermal efficiency transformation, often along with combustion air temperature improves, discharged nitrous oxides exceedes national environmental protection emission request to conventional burner.
Conventional gas burner is in the design in order to ensure that abundant after-flame adopts combustion air and fuel gas to be uniformly distributed the design of conflagration mostly, low nitrogen oxygen gas burner is then avoid in the design occurring district of localized hyperthermia will reducing flame temperature while, being time delay burning of combustion process being tried one's best ensureing after-flame while, there is multiple low nitrogen oxygen combustion technologies such as fractional combustion, smoke backflow, bias combustion in low nitrogen oxygen burner.
Current common low nitrogen oxygen burner under lower combustion air temperature (≤180 DEG C) operating mode and fire box temperature lower (≤800 DEG C) operating mode under than being easier to realize low-nitrogen oxide discharging, but under high temperature combustion supporting air (>=250 DEG C) and blast furnace hearth temperature (>=800 DEG C) situation, even if discharged nitrous oxides significantly improves, be difficult to reach national environmental protection emission request.
Summary of the invention
The object of the present invention is to provide a kind of under high temperature combustion supporting air, realize the two classification low nitrogen oxygen gas burner of trailing edge backflow of nitrogen oxide low emission.
Realize the technical scheme of the object of the invention: the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow, it comprises bellow assemblies, and smoke backflow fin circle is housed in bellow assemblies upper end; Be provided with center fuel burner nozzle in center wind duct in bellow assemblies, at center fuel burner nozzle, rotational-flow stable-flame device be installed; Coaxial tune air duct is installed on bellow assemblies top, has had coaxial cold wind cylinder in gas nozzle lower end, center; Bellow assemblies bottom is provided with combustion air distribution drum; Be provided with fuel gas inlet at place of bellow assemblies bottom centre, be provided with the import of normal temperature combustion air in fuel gas inlet both sides, be provided with high temperature combustion supporting air import in side.
The two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow as above, multiple smoke backflow circle fin evenly opened by the circle on its steel cylinder of the smoke backflow fin circle described in it; Described smoke backflow circle fin shape is triangle, square, semicircle, parabola or half elliptic; Smoke backflow circle fin and combustion air angle are 20-50 °, and define return port.
The two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow as above, the smoke backflow circle fin described in it and return port are higher than furnace bottom upper surface.
The two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow as above, its a part of combustion air enters cold wind cylinder with normal temperature form from the import of normal temperature combustion air; All the other combustion airs enter from high temperature combustion supporting air import with 150-350 DEG C of high temperature form; Whole fuel gas enters from fuel gas inlet.
The two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow as above, it is designed with screen porous in combustion air distribution drum and ensures the even of centre wind.
Effect of the present invention is:
The two classification low nitrogen oxygen gas burner of trailing edge backflow of the present invention, combustion air is divided into high temperature and normal temperature two-stage to send into by burner, and in tune air duct, part high temperature combustion supporting air and the mixing of normal temperature combustion air are formed after eddy flow through rotational-flow stable-flame device, burn with the mutual blending of the combustion gas of center gas nozzle.Because mixing combustion air temperature is lower, deficiency in draught, makes flame of centre temperature obviously reduce simultaneously.Thus temperature classification reduces the generation of heating power NOx.
All the other combustion airs, after toning air duct flows through smoke backflow fin circle at a high speed, form bluff body negative pressuren zone, are sucked by burner hearth flue gas from return port after smoke backflow circle fin, and the mutual blending of peripheral wind facies, reduce the oxygen amount of combustion air.Like this through the fuel of First air remaining after combustion, the combustion air of flue gas continues mixed combustion with blending, and flame temperature is starkly lower than theoretical flame temperature.Burning velocity obviously slows down simultaneously, and flame combustion process is suitably spun out, and can reduce flame temperature further under the effect of For Calculating Radiation Heat Transfer In Furnaces, reaches by reducing flame peak temperature the object reducing NOx and produce.Because burner hearth smoke backflow amount is directly proportional to wind speed degree, therefore burner hearth smoke backflow amount adjusts the conically shaped angle of air duct lower end to adjust by regulating.
Even in order to ensure that combustion air turns to after 90 degree, be designed with combustion air distribution drum screen porous in combustion air distribution drum and ensure the even of centre wind, then enter burner hearth to burn, guarantee the even of combustion air, thus avoid flame drifting unsteady phenomena common in burning.
At the same conditions, adopt the burner of this structure when CO emission compliance, the comparable normal burner of NOx reduces by more than 65%.According to the monitoring of Shanghai Environmental monitoring center, when combustion air temperature 270 DEG C, NOx emission can by 400mg/Nm
3drop to average out to 138mg/Nm
3.
Accompanying drawing explanation
Fig. 1 is the two classification low nitrogen oxygen gas burner structure figure of a kind of trailing edge backflow of the present invention;
Fig. 2 is smoke backflow fin coil structures schematic diagram;
Fig. 3 is combustion air distribution drum structural representation;
In figure: 1. smoke backflow fin circle; 2. adjust air duct; 3. center gas nozzle; 4. rotational-flow stable-flame device; 5. furnace bottom upper surface; 6. cold wind cylinder; 7. bellow assemblies; 8. combustion air distribution drum; 9. normal temperature combustion air import; 10. blanking cover; 11. fuel gas inlet; 12. high temperature combustion supporting air imports; 13. smoke backflow circle fins; 14. return ports; 15. screen porous.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow of the present invention is further described.
As shown in Figure 1, the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow of the present invention, it comprises bellow assemblies 7, in bellow assemblies 7 upper end, smoke backflow fin circle 1 is housed; Be provided with center fuel burner nozzle 3 in center wind duct in bellow assemblies 7, at center fuel burner nozzle 3, rotational-flow stable-flame device 4 be installed; On bellow assemblies 7 top, coaxial tune air duct 2 is installed, has had coaxial cold wind cylinder 6 in center gas nozzle 3 lower end; Bellow assemblies 7 bottom is provided with combustion air distribution drum 8; Be provided with fuel gas inlet 11 at place of bellow assemblies 7 bottom centre, be provided with normal temperature combustion air import 9 in fuel gas inlet 11 both sides, be provided with high temperature combustion supporting air import 12 in side.Part combustion air enters cold wind cylinder 6 with normal temperature form from normal temperature combustion air import 9; All the other combustion airs enter from high temperature combustion supporting air import 12 with 150-350 DEG C of high temperature form; Whole fuel gas enters from fuel gas inlet 11.
As shown in Figure 2, multiple smoke backflow circle fin 13 evenly opened by smoke backflow fin circle 1 circle on its steel cylinder; Described smoke backflow circle fin 13 shape is triangle, square, semicircle, parabola or half elliptic; Smoke backflow circle fin 13 and combustion air angle are 20-50 °, and define return port 14.Wherein, smoke backflow circle fin 13 and return port 14 are higher than furnace bottom upper surface 5.
As shown in Figure 3, be designed with screen porous 15 in combustion air distribution drum 8 and ensure the even of centre wind.
In the present invention, a small amount of normal temperature combustion air enters from normal temperature combustion air import 9; Whole fuel gas enters from fuel gas inlet 10.In tune air duct 2, a small amount of high temperature combustion supporting air and the mixing of normal temperature combustion air are after rotational-flow stable-flame device 4 forms eddy flow, and the mutual blending of combustion gas sprayed with center gas nozzle 3 is burnt.Because the not enough fuel gas of combustion air is superfluous, now combustion flame is imperfect combustion, and flame temperature can be starkly lower than theoretical flame temperature.Mix combustion air temperature lower simultaneously, flame of centre temperature is reduced further.Thus temperature classification reduces the generation of heating power NOx.All the other combustion airs, after toning air duct flows through smoke backflow fin circle 1 at a high speed, form bluff body negative pressuren zone, are sucked by burner hearth flue gas from return port after smoke backflow circle fin 13, and the mutual blending of peripheral wind facies, reduce the oxygen amount of combustion air.Like this through the fuel of First air remaining after combustion, the combustion air of flue gas continues mixed combustion with blending, and flame temperature is starkly lower than theoretical flame temperature.Burning velocity obviously slows down simultaneously, and flame combustion process is suitably spun out, and can reduce flame temperature further under the effect of For Calculating Radiation Heat Transfer In Furnaces, reaches by reducing flame peak temperature the object reducing NOx and produce.Because burner hearth smoke backflow amount is directly proportional to wind speed degree, therefore burner hearth smoke backflow amount adjusts the conically shaped angle of air duct 6 lower end to adjust by regulating.
Burner is even in order to ensure that combustion air turns to after 90 degree, is designed with combustion air distribution drum screen porous 15 and ensures the even of centre wind, guarantee the even of combustion air in combustion air distribution drum 8.
Claims (5)
1. the two classification low nitrogen oxygen gas burner of trailing edge backflow, is characterized in that: it comprises bellow assemblies (7), in bellow assemblies (7) upper end, smoke backflow fin circle (1) is housed; Be provided with center fuel burner nozzle (3) in center wind duct in bellow assemblies (7), at center fuel burner nozzle (3), rotational-flow stable-flame device (4) be installed; Coaxial tune air duct (2) is installed on bellow assemblies (7) top, has had coaxial cold wind cylinder (6) in center gas nozzle (3) lower end; Bellow assemblies (7) bottom is provided with combustion air distribution drum (8); Be provided with fuel gas inlet (11) at place of bellow assemblies (7) bottom centre, be provided with normal temperature combustion air import (9) in fuel gas inlet (11) both sides, be provided with high temperature combustion supporting air import (12) in side.
2. the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow according to claim 1, is characterized in that: multiple smoke backflow circle fin (13) evenly opened by described smoke backflow fin circle (1) circle on its steel cylinder; Described smoke backflow circle fin (13) shape is triangle, square, semicircle, parabola or half elliptic; Smoke backflow circle fin (13) and combustion air angle are 20-50 °, and define return port (14).
3. the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow according to claim 1, is characterized in that: described smoke backflow circle fin (13) and return port (14) are higher than furnace bottom upper surface (5).
4. the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow according to claim 1, is characterized in that: a part of combustion air enters cold wind cylinder (6) with normal temperature form from normal temperature combustion air import (9); All the other combustion airs enter from high temperature combustion supporting air import (12) with 150-350 DEG C of high temperature form; Whole fuel gas enters from fuel gas inlet (11).
5. the two classification low nitrogen oxygen gas burner of a kind of trailing edge backflow according to claim 1, is characterized in that: be designed with screen porous (15) in combustion air distribution drum (8) and ensure the even of centre wind.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510520158.6A CN105114951B (en) | 2015-08-21 | 2015-08-21 | The low nitrogen oxygen gas burner of the double classifications of trailing edge reflux |
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| CN201510520158.6A CN105114951B (en) | 2015-08-21 | 2015-08-21 | The low nitrogen oxygen gas burner of the double classifications of trailing edge reflux |
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| CN105114951A true CN105114951A (en) | 2015-12-02 |
| CN105114951B CN105114951B (en) | 2018-07-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546532A (en) * | 2016-01-11 | 2016-05-04 | 安德森热能科技（苏州）有限责任公司 | Ultra-low-emission burner |
| CN105698174A (en) * | 2016-04-11 | 2016-06-22 | 徐州科融环境资源股份有限公司 | Low-nitrogen combustor for gas |
| CN108458339A (en) * | 2017-02-22 | 2018-08-28 | 气体产品与化学公司 | Twin-stage oxy-fuel burner |
| CN108730978A (en) * | 2018-05-18 | 2018-11-02 | 浙江炬烁热能设备制造有限公司 | The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove |
| CN110360553A (en) * | 2018-04-09 | 2019-10-22 | 南京冉星环保科技有限公司 | The super low NO of industrial combustion gas flue gas self-loopa |
| CN113357931A (en) * | 2021-05-17 | 2021-09-07 | 北京科技大学 | Low NOx combustion device of gas flame furnace with smoke self-suck back function |
| CN114151790A (en) * | 2021-12-01 | 2022-03-08 | 北京航天石化技术装备工程有限公司 | Distributed flue gas internal and external dual-cycle coupling staged combustion equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546532A (en) * | 2016-01-11 | 2016-05-04 | 安德森热能科技（苏州）有限责任公司 | Ultra-low-emission burner |
| CN105698174A (en) * | 2016-04-11 | 2016-06-22 | 徐州科融环境资源股份有限公司 | Low-nitrogen combustor for gas |
| CN105698174B (en) * | 2016-04-11 | 2018-07-17 | 徐州科融环境资源股份有限公司 | A kind of combustion gas low NO |
| CN108458339A (en) * | 2017-02-22 | 2018-08-28 | 气体产品与化学公司 | Twin-stage oxy-fuel burner |
| CN108458339B (en) * | 2017-02-22 | 2019-10-18 | 气体产品与化学公司 | Twin-stage oxy-fuel burner |
| CN110360553A (en) * | 2018-04-09 | 2019-10-22 | 南京冉星环保科技有限公司 | The super low NO of industrial combustion gas flue gas self-loopa |
| CN108730978A (en) * | 2018-05-18 | 2018-11-02 | 浙江炬烁热能设备制造有限公司 | The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove |
| 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 |
| CN113357931A (en) * | 2021-05-17 | 2021-09-07 | 北京科技大学 | Low NOx combustion device of gas flame furnace with smoke self-suck back function |
| CN114151790A (en) * | 2021-12-01 | 2022-03-08 | 北京航天石化技术装备工程有限公司 | Distributed flue gas internal and external dual-cycle coupling staged combustion equipment |
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Effective date of registration: 20161201 Address after: 100076 Beijing, Fengtai District, South Road, No. 1, Applicant after: Beijing Aerospace Petrochemical Technology and Equipment Engineering Corporation Address before: 100076 Beijing, Fengtai District, South Road, No. 1, Applicant before: Beijing Inst. of Aerospace Dynamics |
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