CN115076687A - Low NOx samming I type radiant tube based on flue gas inner loop - Google Patents
Low NOx samming I type radiant tube based on flue gas inner loop Download PDFInfo
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- CN115076687A CN115076687A CN202210884480.7A CN202210884480A CN115076687A CN 115076687 A CN115076687 A CN 115076687A CN 202210884480 A CN202210884480 A CN 202210884480A CN 115076687 A CN115076687 A CN 115076687A
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- Prior art keywords
- tube
- pipe
- flue gas
- burner
- radiant tube
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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
- F23D14/12—Radiant burners
- F23D14/125—Radiant burners heating a wall surface to incandescence
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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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- 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)
- Gas Burners (AREA)
Abstract
The invention discloses a low NOx temperature equalizing I-shaped radiant tube based on flue gas internal circulation, which comprises: the bottom end of the outer pipe is fixedly connected with a spherical end head; the inner pipe is positioned in the outer pipe, the inner pipe and the outer pipe are coaxially arranged, the inner pipe is fixedly connected with the outer pipe, and a plurality of flow guide openings are formed in the top side wall and the bottom side wall of the inner pipe; the nozzle, the nozzle is located the outer tube, nozzle and outer tube rigid coupling, nozzle and the coaxial setting of outer tube leave the space between nozzle outer wall and the outer tube inner wall and form a exhanst gas outlet, and the nozzle is located the inner tube top, leaves the space between nozzle and the inner tube. According to the invention, the diversion openings are arranged at the top and the bottom of the inner pipe to lead out part of high-temperature flue gas in the inner pipe and reflux part of low-temperature flue gas between the inner pipe and the outer pipe, so that the uniformity of the temperature of the outer pipe of the I-shaped radiant pipe is improved, the reflux quantity of the flue gas in the radiant pipe is increased, the temperature of a high-temperature area in the inner pipe is reduced, and the content of NOx in the outlet flue gas is reduced.
Description
Technical Field
The invention relates to the technical field of gas radiant tubes, in particular to a low NOx temperature equalizing I-shaped radiant tube based on flue gas internal circulation.
Background
Due to the progress of production technology, people put higher requirements on the quality of certain steel, so that the conventional heat treatment mode of direct flame heating can not meet the requirements of high-quality products any more, and then the radiant tube for indirect heating is produced. The existing radiant tubes are mainly divided into gas-fired radiant tubes and electric heating radiant tubes, wherein the gas-fired radiant tubes are widely applied and have the advantages of high heat utilization rate of primary energy, large thermal power per unit surface area, low operation and maintenance cost and the like.
The I type radiant tube is a type commonly used of gas formula radiant tube, but because I type radiant tube flue gas flow is shorter, can not the entrainment more flue gas backward flow mix, consequently high temperature zone temperature is higher, just also leads to generating more nitrogen oxide, present I type radiant tube is close to spherical end one side because the direct contact of high temperature flue gas and outer tube internal face including the pipe simultaneously for near the outer tube local temperature of here is higher, just also leads to I type radiant tube surface difference in temperature great.
Therefore, it is desirable to design a low NOx temperature equalizing type I radiant tube based on flue gas internal circulation to solve the above problems.
Disclosure of Invention
The invention aims to provide a low NOx temperature-equalizing I-shaped radiant tube based on flue gas internal circulation, which comprises:
the bottom end of the outer pipe is fixedly connected with a spherical end head;
the inner pipe is positioned in the outer pipe, the inner pipe and the outer pipe are coaxially arranged, the inner pipe is fixedly connected with the outer pipe, and a plurality of flow guide openings are formed in the top side wall and the bottom side wall of the inner pipe;
the burner is located in the outer pipe, the burner is fixedly connected with the outer pipe, the burner is coaxially arranged with the outer pipe, a gap is reserved between the outer wall of the burner and the inner wall of the outer pipe to form a flue gas outlet, the burner is located above the inner pipe, and a gap is reserved between the burner and the inner pipe.
Preferably, the shape of the flow guide opening includes, but is not limited to, circular, oval, square, and rectangular.
Preferably, the shape, the number, the opening position and the size of the flow guide openings are determined according to the structural size, the fuel type and the rated power of the radiant tube.
Preferably, a plurality of supporting components are arranged between the inner pipe and the outer pipe, the supporting components are arranged at equal intervals along the vertical direction, each supporting component comprises a plurality of supporting bodies, the supporting bodies are arranged at equal intervals along the circumferential direction, one end of each supporting body is fixedly connected with the inner pipe, and the other end of each supporting body is fixedly connected with the outer pipe.
Preferably, the cross section of the supporting body is a trapezoidal structure, the narrow end of the supporting body is fixedly connected with the inner wall of the outer pipe, and the wide end of the supporting body is fixedly connected with the outer wall of the inner pipe.
Preferably, the size of the inner tube and the position of the inner tube in the outer tube are determined according to the size of the radiant tube, the type of fuel and the rated power.
The invention discloses the following technical effects:
according to the invention, the top of the inner pipe is provided with the flow guide opening to promote the flue gas recirculation in the radiant tube and reduce the temperature of the flue gas in a high-temperature area in the inner pipe, so that the generation of nitrogen oxides is inhibited, and the uniformity of the temperature of the flue gas is improved; through seting up the water conservancy diversion opening in inner tube bottom for make partial high temperature flue gas flow out the inner tube in advance, thereby improve the radiant tube middle part and be close to the surface temperature of burner end outer tube, reduce the high temperature flue gas flow of inner tube flow to spherical end, control radiant tube near the surface temperature of spherical end, thereby improve the homogeneity of radiant tube outer tube surface temperature distribution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a flow guide opening arrangement according to the present invention;
FIG. 2 is a schematic view of another arrangement of the diversion openings in the present invention;
wherein, 1, burner; 2. a flame nozzle; 3. an outer tube; 4. an inner tube; 5. a support body; 6. a spherical end; 7. a flue gas outlet; 8. and (6) opening the flow guide.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a low NOx temperature equalizing I-shaped radiant tube based on flue gas internal circulation, which comprises:
the bottom end of the outer pipe 3 is fixedly connected with a spherical end 6;
the inner pipe 4 is positioned in the outer pipe 3, the inner pipe 4 and the outer pipe 3 are coaxially arranged, the inner pipe 4 is fixedly connected with the outer pipe 3, and a plurality of flow guide openings 8 are formed in the top side wall and the bottom side wall of the inner pipe 4;
Further, the flame nozzle 2 of the nozzle is positioned right above the inner pipe 4.
The diversion opening 8 arranged at the top of the inner pipe 4 can promote the flue gas recirculation in the radiant tube and reduce the temperature of the flue gas in a high-temperature area in the inner pipe 4, thereby inhibiting the generation of nitrogen oxides and improving the uniformity of the temperature of the flue gas; the water conservancy diversion opening 8 that the inner tube 4 bottom was seted up can make partial high temperature flue gas flow out inner tube 4 in advance to improve the radiant tube middle part and be close to 1 end outer tube 3's of nozzle surface temperature, reduce the high temperature flue gas flow that inner tube 4 flowed to spherical end 6, control near spherical end 6 surface temperature, thereby improve the homogeneity of 3 surface temperature distributions of outer tube.
Further, the shape of the diversion opening 8 includes, but is not limited to, circular, oval, square, and rectangular.
Further, the shape, the number, the opening position and the size of the flow guide openings 8 are determined according to the structural size, the fuel type and the rated power of the radiant tube.
The shape, the number, the arrangement position and the size of the flow guide openings 8 are determined according to the structural size, the fuel type and the rated power of the radiant tube, so that part of high-temperature flue gas in the inner tube 4 can be better guided out by the flow guide openings 8 and part of low-temperature flue gas between the inner tube 4 and the outer tube 3 flows back, the uniformity of the temperature of the outer tube 3 of the I-shaped radiant tube is better improved, the back flow of the flue gas in the radiant tube is increased, the temperature of a high-temperature area in the inner tube 4 is reduced, and the content of NOx in outlet flue gas is reduced.
Further, the inner tube 4 with be provided with a plurality of supporting components between the outer tube 3, it is a plurality of the supporting component sets up along vertical direction equidistant, the supporting component includes a plurality of supporters 5, and is a plurality of supporter 5 sets up along circumference equidistant, the one end of supporter 5 with inner tube 4 rigid coupling, the other end of supporter 5 with 3 rigid couplings of outer tube.
Furthermore, the cross section of the support body 5 is a trapezoid structure, the narrow end of the support body 5 is fixedly connected with the inner wall of the outer tube 3, and the wide end of the support body 5 is fixedly connected with the outer wall of the inner tube 4.
Further, the size of the inner tube 4 and the position of the inner tube 4 in the outer tube 3 are determined according to the size of the radiant tube, the type of fuel and the rated power.
The size of the inner tube 4 and the position of the inner tube 4 in the outer tube 3 are determined according to the structural size, the fuel type and the rated power of the radiant tube and are matched with the shape, the number, the size and the opening position of the flow guide openings 8, so that the smoke reflux quantity in the radiant tube and the extraction quantity of high-temperature smoke are adjusted, the uniformity of the surface temperature of the radiant tube is improved, and the content of NOx in smoke at an outlet is reduced.
The working process is as follows: in the use process of the I-shaped radiant tube, the top of the inner tube 4 is provided with the flow guide opening 8, so that the flue gas recirculation in the radiant tube can be promoted, the temperature of the flue gas at a high temperature region in the inner tube 4 is reduced, the generation of nitrogen oxides is inhibited, and the uniformity of the temperature of the flue gas is improved; because the bottom of the inner pipe 4 is provided with the diversion opening 8, part of high-temperature flue gas can flow out of the inner pipe 4 in advance, so that the surface temperature of the middle part of the radiant tube and the outer pipe 3 close to the end of the burner 1 is improved, the flow rate of the high-temperature flue gas flowing from the inner pipe 4 to the spherical end 6 is reduced, the surface temperature near the spherical end 6 is controlled, and the uniformity of the surface temperature of the radiant tube is improved.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. A low NOx temperature equalizing type I radiant tube based on flue gas internal circulation is characterized by comprising the following components:
the bottom end of the outer pipe (3) is fixedly connected with a spherical end (6);
the inner pipe (4) is positioned in the outer pipe (3), the inner pipe (4) and the outer pipe (3) are coaxially arranged, the inner pipe (4) is fixedly connected with the outer pipe (3), and a plurality of flow guide openings (8) are formed in the top side wall and the bottom side wall of the inner pipe (4);
burner (1), burner (1) is located in outer tube (3), burner (1) with outer tube (3) rigid coupling, burner (1) with outer tube (3) coaxial setting, burner (1) outer wall with leave the space between outer tube (3) inner wall and form a exhanst gas outlet (7), burner (1) is located inner tube (4) top, burner (1) with leave the space between inner tube (4).
2. The low-NOx temperature-equalizing type I radiant tube based on the internal circulation of the flue gas as claimed in claim 1, wherein: the shape of the diversion opening (8) includes but is not limited to circular, oval, square, rectangular.
3. The low NOx temperature equalizing type I radiant tube based on flue gas inner circulation according to claim 2, characterized in that: the shape, the number, the opening position and the size of the flow guide openings (8) are determined according to the structural size, the fuel type and the rated power of the radiant tube.
4. The low-NOx temperature-equalizing type I radiant tube based on the internal circulation of the flue gas as claimed in claim 1, wherein: inner tube (4) with be provided with a plurality of supporting component between outer tube (3), it is a plurality of supporting component sets up along vertical direction equidistant, supporting component includes a plurality of supporters (5), and is a plurality of supporter (5) set up along circumference equidistant, the one end of supporter (5) with inner tube (4) rigid coupling, the other end of supporter (5) with outer tube (3) rigid coupling.
5. The low NOx temperature equalizing type I radiant tube based on the internal circulation of the flue gas as claimed in claim 4, wherein: the cross section of the supporting body (5) is of a trapezoid structure, the narrow end of the supporting body (5) is fixedly connected with the inner wall of the outer pipe (3), and the wide end of the supporting body (5) is fixedly connected with the outer wall of the inner pipe (4).
6. The low NOx temperature equalizing type I radiant tube based on the flue gas inner circulation is characterized in that: the size of the inner tube (4) and the position of the inner tube (4) in the outer tube (3) are determined according to the size of the radiant tube, the type of fuel and the rated power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210884480.7A CN115076687B (en) | 2022-07-25 | 2022-07-25 | Low NOx samming I type radiant tube based on flue gas inner loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210884480.7A CN115076687B (en) | 2022-07-25 | 2022-07-25 | Low NOx samming I type radiant tube based on flue gas inner loop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115076687A true CN115076687A (en) | 2022-09-20 |
| CN115076687B CN115076687B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210884480.7A Active CN115076687B (en) | 2022-07-25 | 2022-07-25 | Low NOx samming I type radiant tube based on flue gas inner loop |
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| Country | Link |
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| CN (1) | CN115076687B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7421274A (en) * | 1974-10-10 | 1976-04-15 | Hotwork Ltd | Heating devices |
| JP2002349807A (en) * | 2001-05-30 | 2002-12-04 | Tokyo Gas Co Ltd | Single end type radiant tube device |
| CN202643764U (en) * | 2012-06-18 | 2013-01-02 | 武汉钢铁(集团)公司 | Rotatable type I sleeve type radiant tube |
| CN204786418U (en) * | 2015-07-13 | 2015-11-18 | 佛山市科皓燃烧设备制造有限公司 | Be applied to I type two -stage heat exchanger of radiant tube nozzle |
| CN105157452A (en) * | 2015-08-26 | 2015-12-16 | 武汉钢铁(集团)公司 | Efficient heat exchanger for non-self-preheating gas burner type radiation pipe |
| CN106051761A (en) * | 2015-04-16 | 2016-10-26 | 大同特殊钢株式会社 | Radiant tube heating device |
| CN109404913A (en) * | 2018-12-08 | 2019-03-01 | 佛山市科皓燃烧设备制造有限公司 | A kind of flame inner tube and its radiant tube applied in radiant tube |
| CN208736206U (en) * | 2018-07-16 | 2019-04-12 | 苏州新盛超净化系统有限公司 | For the steam(-)coil in vapor heat exchanger |
| CN216953044U (en) * | 2022-04-01 | 2022-07-12 | 深圳市佳运通电子有限公司 | Full-premixing flue gas internal circulation low-nitrogen combustor |
-
2022
- 2022-07-25 CN CN202210884480.7A patent/CN115076687B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7421274A (en) * | 1974-10-10 | 1976-04-15 | Hotwork Ltd | Heating devices |
| JP2002349807A (en) * | 2001-05-30 | 2002-12-04 | Tokyo Gas Co Ltd | Single end type radiant tube device |
| CN202643764U (en) * | 2012-06-18 | 2013-01-02 | 武汉钢铁(集团)公司 | Rotatable type I sleeve type radiant tube |
| CN106051761A (en) * | 2015-04-16 | 2016-10-26 | 大同特殊钢株式会社 | Radiant tube heating device |
| CN204786418U (en) * | 2015-07-13 | 2015-11-18 | 佛山市科皓燃烧设备制造有限公司 | Be applied to I type two -stage heat exchanger of radiant tube nozzle |
| CN105157452A (en) * | 2015-08-26 | 2015-12-16 | 武汉钢铁(集团)公司 | Efficient heat exchanger for non-self-preheating gas burner type radiation pipe |
| CN208736206U (en) * | 2018-07-16 | 2019-04-12 | 苏州新盛超净化系统有限公司 | For the steam(-)coil in vapor heat exchanger |
| CN109404913A (en) * | 2018-12-08 | 2019-03-01 | 佛山市科皓燃烧设备制造有限公司 | A kind of flame inner tube and its radiant tube applied in radiant tube |
| CN216953044U (en) * | 2022-04-01 | 2022-07-12 | 深圳市佳运通电子有限公司 | Full-premixing flue gas internal circulation low-nitrogen combustor |
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| CN115076687B (en) | 2023-05-05 |
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