CN102418936A - Air injecting and backflow flue gas entraining heat exchanger for radiant tube combustion device - Google Patents
Air injecting and backflow flue gas entraining heat exchanger for radiant tube combustion device Download PDFInfo
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- CN102418936A CN102418936A CN2011104064189A CN201110406418A CN102418936A CN 102418936 A CN102418936 A CN 102418936A CN 2011104064189 A CN2011104064189 A CN 2011104064189A CN 201110406418 A CN201110406418 A CN 201110406418A CN 102418936 A CN102418936 A CN 102418936A
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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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Abstract
The invention relates to the technology of a heat exchanger, in particular to an air injecting and backflow flue gas entraining heat exchanger for a radiant tube combustion device. The heat exchanger comprises a heat exchanger shell with a four-way structure, wherein the heat exchanger shell is connected with an inner core tube, a heat exchange tube and a high-temperature air injection tube; the high-temperature air injection tube has a conical reducing tube structure and is used for forming an air injection channel; the air injection nozzle end of the heat exchanger shell is connected with a main combustion nozzle through a corrugated pipe; and the flue gas inlet end of the heat exchanger shell is communicated with a radiant tube. In the heat exchanger, a conical reducing air injection pipe is added, negative pressure zone entrainment flue gas is formed, and the flue gas is mixed with preheated air; on the basis of effective heat exchange of the heat exchange tube, the preheating temperature of air is increased effectively; after the flue gas is mixed with the air, the oxygen concentration in a combustion zone is reduced, the generation amount of NOx is reduced, and the discharge amount of pollutants is reduced; fin structures arranged on the outer and inner sides in a staggered way increase a heat exchange area, and the turbulence scale of the flue gas and the air, improve a heat exchange effect, and utilize the flue gas afterheat efficiently; and the components are easy to assemble and disassemble.
Description
Technical field
Patent of the present invention relates to technical field of heat exchange devices, relates in particular to be applied to a kind of heat-exchanger rig of using with the supporting use of radiant tube burner, warm-up combustion-supporting air.
Background technology
At present, in metal heat treatmet, material thawing etc. required than higher industry to product quality, the direct mode of heating of traditional naked light had been difficult to satisfy technological requirement, and the radiant tube burner adopts the indirect mode to obtain promotion and application widely.In order to improve efficiency of combustion, make full use of energy, these burners mostly are furnished with heat exchanger and come warm-up combustion-supporting air.Usually the form of radiant tube burner heat exchanger mainly contains two kinds: (1) and the matching used heat exchanger of suction-type radiant tube, heat exchanger are employed in heat exchanger tube inboard or the outside add pitted skin with fin or on the heat exchanger tube surface mode more and strengthen the heat exchange effect.This heat exchanger air flow resistance loss is little, but heat exchange efficiency is lower, and under 1000 ℃ flue-gas temperature, air only can be preheating to 350-400 ℃, and smoke evacuation is more than 650 ℃; (2) with blast the matching used heat exchanger of formula radiant tube, this heat exchanger adopts the jet flow stroke to add the structural shape of finned tube more, promptly the heat exchanger outer tube is provided with finned tube, interior pipe adopts the multiple-pass jet structure to improve the heat exchange effect.This heat exchanger air flow resistance loss is big, need bigger air feed pressure, but heat exchange efficiency is higher, and under 1000 ℃ flue-gas temperature, air can be preheating to more than 500 ℃, and exhaust gas temperature drops to below 600 ℃.In addition, combustion air temperature is low, also has NO
xThe problem that discharge capacity is big.
Summary of the invention
The object of the present invention is to provide a kind of simple and practical, effectively improve air preheating temperature, the air that reduces pollutant emission sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger.
For achieving the above object; The scheme that the present invention adopts is: a kind of air sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger; Include heat exchanger shell, inner core tube, heat exchanger tube, high temperature air playpipe; Heat exchanger shell is a four-way structure, comprises that preheated air inlet, smoke inlet, exhanst gas outlet, air spray to mix gas port, and inner core tube runs through and embeds behind the heat exchanger shell in the heat exchanger tube and form continuous passage with the inner chamber of heat exchanger tube; Wherein the zone is the air preheat passage between inner core tube outer wall and the heat exchanger tube, and the sealing of heat exchanger tube bottom, openend link to each other with heat exchanger shell; The high temperature air playpipe is the little conical taper tubular construction in big top, bottom; And the air that the bottom is connected heat exchanger shell sprays in the mixed gas port, and high temperature air playpipe inner chamber and air preheat channel connection form and form the smoke backflow passage between jet channel, its outer wall and the mixed gas port; Heat exchanger shell smoke inlet end is communicated with radiant tube, air sprays mixed gas port end and is connected with main burner through bellows.
Preferably, described heat exchanger tube is welded by connection straight tube, finned tube, sealing bulb successively, and the inside and outside both sides of finned tube tube wall are connected with the fin that is used for heat exchange, and the sealing bulb is used for fins pipe bottom, connects straight tube and is communicated with finned tube and heat exchanger shell.
Preferably, be welded with the special-shaped flange of two carbon steel materials on the described inner core tube, a slice is in order to be connected with air intake duct, and a slice is in order to be connected with heat exchanger shell.
Preferably, the fin of described finned tube is adjacent cross structure.
Preferably, described finned tube is welded by the independent finned tube of making more than two sections.
Beneficial effect of the present invention:
(1) heat exchanger adds the conical taper air injection tube, and the negative pressuren zone that forms through the air high velocity jet entrainments flue gas, makes flue gas and preheated air blending, on the basis of the effective heat exchange of heat exchanger tube, can air preheating temperature be improved more than 100 ℃;
(2) air injection tube is installed on heat exchanger shell preheated air exit, cooperates the conical taper structure of playpipe, can adapt to bigger pressure oscillation, guarantees the validity that flue gas entrainments;
(3) after flue gas and the air blending, reduced the oxygen concentration of combustion zone, NO
xGrowing amount reduces significantly, has reduced the discharge capacity of pollutant;
(4) heat-exchange finned tube adopts inside and outside bilateral fin structure, and heat exchange area increases, and finned tube adjacent fins interlaced arrangement; Help increasing flue gas and air turbulence degree, increased the coefficient of heat transfer greatly, help abundant warm-up combustion-supporting air; Strengthen the heat exchange effect, high efficiency is utilized fume afterheat;
(5) this heat exchanger assembly is few, is easy to installing/dismounting between each assembly.
Description of drawings
Fig. 1 is the schematic top plan view of the embodiment of the invention;
Fig. 2 is the elevational cross-sectional view of the embodiment of the invention;
Fig. 3 is that the C of Fig. 2 is to side view;
Fig. 4 is the B-B cutaway view Amplified image of finned tube among Fig. 2;
Fig. 5 is the embodiment of the invention and the matching used structural representation of radiant tube burner;
Description of symbols among the figure: 1-seals bulb, the 2-finned tube, and 3-air preheat passage, 4-connects straight tube; The 5-heat exchanger shell, 6-high temperature air playpipe, 7-jet channel, 8-smoke backflow passage; The 9-air inlet passageway, 10-exhanst gas outlet passage, 11-radiant tube adpting flange, 12-inner core tube; The 13-bellows, 14-master's burner, 15-flue gas heat exchange passage, 16-radiant tube.
The specific embodiment
In order to understand the present invention better, below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is done to further describe, referring to Fig. 1 to Fig. 5.
The air of implementing according to the present invention sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger, and whole heat exchanger includes heat exchanger shell 5, high temperature air playpipe 6, heat exchanger tube, inner core tube 12.Heat exchanger shell 5 is for adopting the four-way structure of heat resisting steel casting; Possess air intake, smoke inlet, exhanst gas outlet, the mixed gas port of air injection; Inner core tube 12, high temperature air playpipe 6, heat exchanger tube all are connected on the heat exchanger shell 5, and form continuous passage through housing 5.During with the supporting use of radiant tube burner, the smoke inlet end of heat exchanger shell 5 is communicated with radiant tube 16, air sprays mixed gas port end and is connected with main burner 14 through bellows 13.
Heat exchanger tube integral body is the heat resisting steel material; And finned tube 2, sealing bulb 1 by connection straight tube 4, plurality of sections are independently made are formed; Adopt welding fixing between the each several part, finned tube 2 is in order to heat exchange between flue gas and the air, and adjacent staggered fin is all arranged in inside and outside both sides; To increase air and flue gas turbulence level, strengthen heat exchange.1 of sealing bulb mainly plays fins pipe 2 and air guide effect.Connect 4 of straight tubes and be communicated with finned tube 2 and heat exchanger shell 5, its two is welded on the smoke inlet end and finned tube 2 head ends of heat exchanger shell 5 respectively.
High temperature air playpipe 6 adopts the heat resisting steel casting, and it is the little conical taper tubular construction in big top, bottom, can guarantee that the combustion air after the preheating sprays with higher speed, forms the stabilizing effective negative pressuren zone to entrainment flue gas.High temperature air playpipe 6 bottoms are connected with thread connecting mode in the mixed gas port of heat exchanger shell 5, and its inner chamber is communicated with formation smoke backflow passage 8 between formation jet channel 7, outer wall and the mixed gas port with air preheat passage 3.
During heat exchanger work; Air gets into inner core tube 12 through intake channel 9, proceeds to sealing bulb 1 place along inner core tube 12, after sealing bulb 1 guiding, gets into the air preheat passage 3 between inner core tube 12 and the finned tube 2 in the other direction; With entering heat exchanger shell 5 after the finned tube 2 abundant heat exchange; Arrive high temperature air afterwards and spray to mix gas port 6 places, with ejection at a high speed, get into the main burner 14 air inlet passages that are connected with flange with heat exchanger shell 5 through the high temperature air playpipe 6 of conical taper structure; The air of ejection forms the stabilizing effective negative pressuren zone near mixing gas port at a high speed simultaneously; The existence of negative pressuren zone is entrainmented flue gas and is got into main burner 14 air inlet passages, with the combustion air blending to improve combustion air temperature, reduce oxygen concentration in the combustion air simultaneously.
The embodiment of heat exchanger when Fig. 5 has provided with the supporting use of radiant tube burner; The outlet 7 of heat exchanger preheated air is connected with main burner 14 through bellows 13; 11 mounting flange interface is fixedly connected with radiant tube 16 on the heat exchanger shell; Form flue gas heat exchange passage 15 between heat exchanger tube (sealing bulb 1, finned tube 2, connect straight tube 4 form) and the radiant tube 16, flue gas in this passage through finned tube 2 with the heat transferred combustion air, leave radiant tube 16 entering heat exchanger shells 5 afterwards; Flue gas is when leaving heat exchanger shell 5; Part of smoke is entrainmented to get into bellows 13 and mixes with combustion air, gets into main burner 14 then, and another part is through heat exchanger shell 5 discharges; After combustion air gets into from air inlet passageway 9; In inner core tube 12, flow;, sealing bulb 1 gets into the air preheat passage 3 between inner core tube 12 and the finned tube 2 after turning to; Fully the air after the preheating gets into heat exchanger shell 5, then through high temperature air jet 6 to spray into bellows 13 at a high speed and fully to mix with the flue gas that entrainments entering, get into main burner 14 afterwards and burn.Because oxygen content significantly reduces in the combustion air, has avoided the generation in localized hyperthermia district during burning, NO
xGrowing amount significantly reduce, reduced the discharge capacity of pollutant.
The above disclosed preferred embodiment that is merely patent of the present invention can not limit the interest field of patent of the present invention certainly with this, so according to the equivalence variation that patent application claim of the present invention is done, still belong to the protection domain of patent of the present invention.
Claims (5)
1. an air sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger, it is characterized in that: include heat exchanger shell (5), inner core tube (12), heat exchanger tube, high temperature air playpipe (6).Heat exchanger shell (5) is a four-way structure; Comprise that preheated air inlet, smoke inlet, exhanst gas outlet, air spray mixed gas port; Inner core tube (12) runs through that heat exchanger shell (5) back embeds in the heat exchanger tube and forms continuous passage with the inner chamber of heat exchanger tube; Wherein the zone is air preheat passage (3) between inner core tube (12) outer wall and the heat exchanger tube, and the sealing of heat exchanger tube bottom, openend link to each other with heat exchanger shell (5); High temperature air playpipe (6) is the little conical taper tubular construction in big top, bottom; And the air that the bottom is connected heat exchanger shell (5) sprays in the mixed gas port, and high temperature air playpipe (6) inner chamber is communicated with formation smoke backflow passage (8) between formation jet channel (7), its outer wall and the mixed gas port with air preheat passage (3); Heat exchanger shell (5) smoke inlet end is communicated with radiant tube (16), air sprays mixed gas port end and is connected with main burner (14) through bellows (13).
2. air according to claim 1 sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger; It is characterized in that: described heat exchanger tube is welded by connection straight tube (4), finned tube (2), sealing bulb (1) successively; The inside and outside both sides of finned tube (2) tube wall are connected with the fin that is used for heat exchange; Sealing bulb (1) is used for fins pipe bottom and is communicated with inner core tube (12) and finned tube, connects straight tube (4) and is communicated with finned tube and heat exchanger shell (5).
3. air according to claim 1 sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger; It is characterized in that: the special-shaped flange that is welded with two carbon steel materials on the described inner core tube (12); A slice is in order to be connected with air intake duct, and a slice is in order to be connected with heat exchanger shell (5).
4. air according to claim 2 sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger, and it is characterized in that: the fin of described finned tube (2) is adjacent cross structure.
5. air according to claim 2 sprays the radiant tube burner that entrainments the backflow flue gas and uses heat exchanger, it is characterized in that: described finned tube (2) is welded by the independent finned tube of making more than two sections.
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|---|---|---|---|
| CN2011104064189A CN102418936A (en) | 2011-12-08 | 2011-12-08 | Air injecting and backflow flue gas entraining heat exchanger for radiant tube combustion device |
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| CN2011104064189A CN102418936A (en) | 2011-12-08 | 2011-12-08 | Air injecting and backflow flue gas entraining heat exchanger for radiant tube combustion device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705860A (en) * | 2012-06-15 | 2012-10-03 | 马鞍山市正元冶金设备有限公司 | Heat exchanger for air swirl injection radiant tube |
| CN102759109A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air-coal gas preheating finned pipe type radiation pipe burner heat exchanger and heat exchange method |
| CN102759107A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air and coal gas double-preheating secondary injection type radiant tube nozzle heat exchanger and heat exchanging method |
| CN102853445A (en) * | 2012-07-03 | 2013-01-02 | 中冶南方(武汉)威仕工业炉有限公司 | Double-stroke air preheating radiant tube burner heat exchanger |
| CN103486606A (en) * | 2013-09-30 | 2014-01-01 | 中冶南方(武汉)威仕工业炉有限公司 | Ceramic material radiant tube burner heat exchanger |
| CN103574632A (en) * | 2013-11-22 | 2014-02-12 | 中冶南方(武汉)威仕工业炉有限公司 | Baffle board radiant tube burner heat exchanger and heat exchange method |
| CN106225006A (en) * | 2016-08-31 | 2016-12-14 | 江苏华冶科技股份有限公司 | A kind of radial canal double heat exchanger |
| CN107906516A (en) * | 2017-12-13 | 2018-04-13 | 中冶京诚(扬州)冶金科技产业有限公司 | A kind of continous way Self-heat-storage flameless burner of the double preheatings of air/gas |
| CN109790980A (en) * | 2016-09-29 | 2019-05-21 | 杰富意钢铁株式会社 | The manufacturing method of heat exchanger, radiant tube type heating device and heat exchanger |
| CN113531527A (en) * | 2021-06-24 | 2021-10-22 | 鞍钢股份有限公司 | High-efficient heat exchanger and combustor of gas radiant tube |
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| CN202350082U (en) * | 2011-12-08 | 2012-07-25 | 中冶南方(武汉)威仕工业炉有限公司 | Heat exchanger of radiant tube combustion device for air injection entrainment reflux flue gas |
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| US6190159B1 (en) * | 1999-03-03 | 2001-02-20 | Hauck Manufacturing Company | Method and apparatus for reducing nitrous oxides and CO emissions in a gas-fired recuperated radiant tube burner |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705860A (en) * | 2012-06-15 | 2012-10-03 | 马鞍山市正元冶金设备有限公司 | Heat exchanger for air swirl injection radiant tube |
| CN102853445A (en) * | 2012-07-03 | 2013-01-02 | 中冶南方(武汉)威仕工业炉有限公司 | Double-stroke air preheating radiant tube burner heat exchanger |
| CN102759109A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air-coal gas preheating finned pipe type radiation pipe burner heat exchanger and heat exchange method |
| CN102759107A (en) * | 2012-07-31 | 2012-10-31 | 中冶南方(武汉)威仕工业炉有限公司 | Air and coal gas double-preheating secondary injection type radiant tube nozzle heat exchanger and heat exchanging method |
| CN103486606A (en) * | 2013-09-30 | 2014-01-01 | 中冶南方(武汉)威仕工业炉有限公司 | Ceramic material radiant tube burner heat exchanger |
| CN103574632A (en) * | 2013-11-22 | 2014-02-12 | 中冶南方(武汉)威仕工业炉有限公司 | Baffle board radiant tube burner heat exchanger and heat exchange method |
| CN106225006A (en) * | 2016-08-31 | 2016-12-14 | 江苏华冶科技股份有限公司 | A kind of radial canal double heat exchanger |
| CN109790980A (en) * | 2016-09-29 | 2019-05-21 | 杰富意钢铁株式会社 | The manufacturing method of heat exchanger, radiant tube type heating device and heat exchanger |
| US11209225B2 (en) | 2016-09-29 | 2021-12-28 | Jfe Steel Corporation | Heat exchanger, radiant tube type heating device, and method of manufacturing heat exchanger |
| CN107906516A (en) * | 2017-12-13 | 2018-04-13 | 中冶京诚(扬州)冶金科技产业有限公司 | A kind of continous way Self-heat-storage flameless burner of the double preheatings of air/gas |
| CN107906516B (en) * | 2017-12-13 | 2023-12-12 | 中冶京诚(扬州)冶金科技产业有限公司 | Continuous self-heat-storage flameless burner with air/gas double preheating function |
| CN113531527A (en) * | 2021-06-24 | 2021-10-22 | 鞍钢股份有限公司 | High-efficient heat exchanger and combustor of gas radiant tube |
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Application publication date: 20120418 |