CN105570890A - Hot flue gas self-circulation type ultra-low NOx combustor - Google Patents
Hot flue gas self-circulation type ultra-low NOx combustor Download PDFInfo
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- CN105570890A CN105570890A CN201610144072.2A CN201610144072A CN105570890A CN 105570890 A CN105570890 A CN 105570890A CN 201610144072 A CN201610144072 A CN 201610144072A CN 105570890 A CN105570890 A CN 105570890A
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- Prior art keywords
- refractory brick
- combustion chamber
- gas gun
- injection
- combustor
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Classifications
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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
- F23D14/46—Details, e.g. noise reduction means
-
- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a hot flue gas self-circulation type ultra-low NOx combustor. The hot flue gas self-circulation type ultra-low NOx combustor mainly comprises a combustor shell, a refractory brick, Venturi tubes, injection gas guns, a main gas gun, a wind control baffle and a nightlight, wherein the combustor shell is fixed to a furnace bottom board through flanges; the refractory brick is located on the upper portion of the combustor shell; a center channel of the refractory brick is a combustion chamber; the Venturi tubes are distributed on the refractory brick; the injection gas guns are arranged around the refractory brick at equal intervals; an injection sprayer is mounted at the head portion of each injection gas gun; the center line of a spray hole in each injection sprayer coincides with the center line of the corresponding Venturi tube; an outlet in the upper portion of each Venturi tube is located at the upper layer of the combustion chamber; the main gas gun penetrates through the center of the combustor, is coaxial with the refractory brick and is located at the lower layer of the combustion chamber; the wind control baffle is mounted on the side wall of the combustor shell and communicates with the combustion chamber in the center of the refractory brick; the nightlight is arranged on one side of the main gas gun. According to the combustor, the NOx generation amount can be effectively reduced, the vertical temperature of a furnace hearth can be balanced, and the radiative heat transfer effect can be enhanced.
Description
Technical field
The invention belongs to petrochemical industry, relate generally to a kind of heat smoke self-circulation type and surpass low-NOx combustor.
Background technology
Along with the issue of China GB31570-2015 " petroleum refining industry pollutant emission standard ", new environmental protection standard is to the discharge restriction increasingly stringent of NOx, and adopting low-NOx combustor to be current each large oil play solution heating furnace NOx emission is the most fast, also the most direct scheme.
Current low-NOx combustor reduces the growing amount of NOx in fuel combustion process mainly through fuel technologies such as two sections of burnings, flame segmentation, smoke backflows.But two sections of burnings are limited in one's ability to what suppress NOx to generate, and the more difficult control of the proportioning that there is first and second air in practice; When flame is segmented in fire box temperature lower than 500 DEG C, combustion flame starts to become unstable, and in combustion product, the content of CO can significantly increase; Smoke backflow take part in combustion process due to low-temperature flue gas, reduces combustion flame temperature, reduces excess air coefficient, thus reduces the generation of NOx.Adopt smoke backflow be reduce heating furnace NOx emission the most at all, most effective method, according to the outside flue gas recirculation of body of heater, flue and controllable register need be set up between blower inlet and air-introduced machine outlet, therefore will the problem that operating cost is high, floor space is large be faced.
Summary of the invention
The object of this invention is to provide a kind of heat smoke self-circulation type and surpass low-NOx combustor, by means of only burner itself without the need to can flue gas recirculation be realized by external impetus, thus reach ring
Guarantor, energy-conservation effect.
Object of the present invention can adopt following technical scheme to realize:
The heat smoke self-circulation type that the present invention proposes surpasses low-NOx combustor and mainly comprises burner shell, refractory brick, Venturi tube, injection gas gun, main gas gun, adjust windshield plate and altar lamp, described burner is fixed on drop-bottom by the mounting flange on burner shell, refractory brick is positioned at burner shell top, its central passage forms the combustion chamber of described burner, refractory brick is evenly arranged concealed Venturi pipe, injection gas gun is equidistantly arranged around refractory brick, injection shower nozzle is installed on injection gas gun head, orifice center line on injection shower nozzle overlaps with the center line of Venturi tube, Venturi tube upper outlet is positioned at the upper strata of combustion chamber, main gas gun by burner centre through and coaxial with refractory brick, being positioned at combustion chamber lower floor adjusts windshield plate to be arranged on burner casing body sidewall, central combustion chamber communicates with refractory brick, altar lamp is arranged on main gas gun side.
Described refractory brick is evenly arranged eight Venturi tubes, Venturi tube is center of circle radiant type distribution, and is positioned at upper strata, combustion chamber.
Described injection gas gun is evenly arranged in around refractory brick, and injection shower nozzle is installed on injection gas gun head, and the orifice center line on injection shower nozzle overlaps with the center line of Venturi tube.
Described main gas gun is arranged on burner centre, coaxial with refractory brick, is positioned at combustion chamber lower floor, for smooth combustion flame.
Said structure of the present invention can make the fuel gas that the main gas gun being in combustion chamber lower floor ejects mix with combustion air through refractory brick, this part of fuel is burnt under average stoichiometric air dme ratio and 16:1, the fuel gas that the ejection head height speed being in upper strata, combustion chamber ejects, when by Venturi tube, negative pressure can be produced at the contraction section of Venturi tube, utilize this negative pressure to be sucked in Venturi tube by the low-temperature flue gas of lower furnace portion to mix with fuel gas, the air-fuel ratio of fuel gas and combustion air can be made to reach 20:1 after finally mixing with combustion air in refractory brick, this part of fuel is made to be in lean burn state.During stratified combustion upper and lower due to combustion chamber, the fuel gas that the injection shower nozzle being in upper strata, combustion chamber sprays is lean burn state, the flame instability formed after burning, and the fuel gas that the main gas gun being in combustion chamber lower floor sprays and combustion air burn under average stoichiometric air dme ratio 16:1, the flame formed in combustion chamber lower floor is upright and outspoken, strong, effectively stabilizes upper strata, combustion chamber flame.Mostly be non-flammable inert gas in the low-temperature flue gas be inhaled into, and burner hearth bottom flue-gas temperature comparatively flame zone temperature is lower, effectively can reduce combustion flame district temperature with after combustion air and fuel mix; After low-temperature flue gas mixes with combustion air, reduce the oxygen concentration in combustion air, therefore under lower oxygen concentration and lower flame temperature, the generation of NOx obtains effective suppression.Simultaneously under the ejector action of injection shower nozzle and Venturi, achieve the upper and lower circulation of burner hearth inside smoke, can the upper and lower temperature of active balance burner hearth, strengthening radiant heat transfer, further increases the thermal efficiency of heating furnace.But in flue gas, mostly being non-flammable inert gas, the amount of circulating flue gas is unsuitable excessive, and general control is best at 10% ~ 20% of total exhaust gas volumn, and the excessive after-combustion of amount of circulating gas can become very unstable, and the utilization rate of fuel declines thereupon.
Burner proposed by the invention is compared with conventional burners, and flame temperature can be down to less than 1200 DEG C, and the growing amount of NOx can reduce 40% ~ 60%, and simultaneously thermal efficiency of heating furnace can improve 1%, is to integrate environmental protection, energy-conservation, efficient novel burner.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, refractory brick, 2, Venturi tube, 3, injection shower nozzle, 4, injection gas gun, 5, burner shell, 6, altar lamp, 7, main gas gun, 8, adjust windshield plate, 9, drop-bottom, 10, burner hearth.
Detailed description of the invention
By reference to the accompanying drawings the present invention is further illustrated:
As shown in Figure 1, a kind of heat smoke self-circulation type surpasses low-NOx combustor, forms primarily of burner shell 5, refractory brick 1, Venturi tube 2, injection gas gun 4, main gas gun 7, tune windshield plate 8, altar lamp 6.Described burner is fixed on drop-bottom 9 by the mounting flange on burner shell 5, refractory brick 1 is positioned at burner shell 5 top, its inside center passage forms the combustion chamber of described burner, refractory brick 1 central passage is combustion chamber, refractory brick 1 is evenly arranged eight Venturi tubes 2, Venturi tube 2 is in the distribution of center of circle radiant type, eight injection gas guns 4 are arranged on around refractory brick 1, injection shower nozzle 3 is installed on injection gas gun 4 head, orifice center line on injection shower nozzle 3 overlaps with the center line of Venturi tube 2, Venturi tube 2 upper outlet is positioned at the upper strata of combustion chamber, main gas gun 7 is arranged on burner centre, and coaxial with refractory brick 1, is positioned at the lower floor of combustion chamber, for smooth combustion flame, adjust windshield plate 8 to be positioned at combustor sidewalls, the combustion chamber helping combustion air channel and formed by refractory brick 1 of its inside, altar lamp 6 is arranged near main gas gun 7.
Burner of the present invention adopts flue gas self-loopa, lean burn, stratified combustion, the fuel gas that the main gas gun 7 of combustion chamber lower floor sprays burns by under average stoichiometric air dme ratio 16:1 with combustion air in combustion chamber, the combustion flame formed is upright and outspoken, effectively, the fuel gas that injection shower nozzle 3 high velocity jet on upper strata, combustion chamber goes out is when through Venturi tube 2, negative pressure can be produced at its suction casing, this negative pressure is utilized to be drawn into by the low-temperature flue gas of burner hearth 10 bottom in Venturi tube 2 and fuel mix, and finally deliver in refractory brick 1 combustion chamber and mix with combustion air, after mixing, the air-fuel ratio of fuel gas and combustion air reaches 20:1, be in lean burn state, the flame instability that burning is formed, and combustion chamber lower floor is upright and outspoken, strong flame effectively stabilizes the flame on upper strata, combustion chamber.Comparatively flame zone temperature is lower for burner hearth 10 bottom flue-gas temperature, and containing a large amount of non-flammable inert gas in flue gas, after mixing, has both reduced the temperature of flame zone, and again reduced the oxygen concentration in combustion air, and inhibit the generation of NOx with combustion air.Simultaneously under the ejector action of injection shower nozzle and Venturi, burner has driven the upper and lower flue gas recirculation of burner hearth 10, the flue-gas temperature that active balance burner hearth 10 is upper and lower, enhances radiant heat transfer, improves thermal efficiency of heating furnace.But in flue gas, mostly being non-flammable inert gas, the amount of circulating flue gas is unsuitable excessive, and general control is best at 10% ~ 20% of total exhaust gas volumn, and the excessive after-combustion of amount of circulating gas can become very unstable, and the utilization rate of fuel declines thereupon.
Claims (4)
1. a heat smoke self-circulation type surpasses low-NOx combustor, mainly comprise burner shell (5), refractory brick (1), Venturi tube (2), injection gas gun (4), main gas gun (7), adjust windshield plate (8) and altar lamp (6), it is characterized in that: described burner is fixed on drop-bottom (9) by the mounting flange on burner shell (5), refractory brick (1) is positioned at burner shell (5) top, its inside center passage forms the combustion chamber of described burner, refractory brick (1) is evenly arranged concealed Venturi pipe (2), injection gas gun (2) is equidistantly arranged around refractory brick (1), injection shower nozzle (3) is arranged at injection gas gun (4) head, orifice center line on injection shower nozzle (3) overlaps with the center line of Venturi tube (2), Venturi tube 2 upper outlet is positioned at the upper strata of combustion chamber, main gas gun (7) by burner centre through and coaxial with refractory brick (1), be positioned at the lower floor of combustion chamber, windshield plate (8) is adjusted to be arranged on burner shell (5) sidewall, communicate with refractory brick (1) central combustion chamber, altar lamp (6) is arranged on main gas gun (7) side.
2. a kind of heat smoke self-circulation type according to claim 1 surpasses low-NOx combustor, and it is: described refractory brick (1) is evenly arranged eight Venturi tubes (2), and Venturi tube (2) distributes in center of circle radiant type, and is positioned at upper strata, combustion chamber.
3. a kind of heat smoke self-circulation type according to claim 1 surpasses low-NOx combustor, it is characterized in that: described injection gas gun (4) is evenly arranged in refractory brick (1) around, injection shower nozzle (3) is installed on injection gas gun (4) head, and the orifice center line on injection shower nozzle (3) overlaps with the center line of Venturi tube (2).
4. a kind of heat smoke self-circulation type according to claim 1 surpasses low-NOx combustor, it is characterized in that: described main gas gun (7) is arranged on burner centre, coaxial with refractory brick (1), is positioned at combustion chamber lower floor, for smooth combustion flame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610144072.2A CN105570890A (en) | 2016-03-15 | 2016-03-15 | Hot flue gas self-circulation type ultra-low NOx combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610144072.2A CN105570890A (en) | 2016-03-15 | 2016-03-15 | Hot flue gas self-circulation type ultra-low NOx combustor |
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| Publication Number | Publication Date |
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| CN105570890A true CN105570890A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610144072.2A Pending CN105570890A (en) | 2016-03-15 | 2016-03-15 | Hot flue gas self-circulation type ultra-low NOx combustor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287836A (en) * | 2016-11-21 | 2017-01-04 | 柳惠斌 | A kind of quiet burner |
| CN107062214A (en) * | 2017-05-10 | 2017-08-18 | 北京航天石化技术装备工程有限公司 | A kind of indifferent gas half premixes the ultralow NOx gas burners of classification |
| CN107990315A (en) * | 2017-11-24 | 2018-05-04 | 北京拓首能源科技股份有限公司 | A kind of low-nitrogen discharged fuel gun of Furnace burner center fire |
| CN113864774A (en) * | 2021-09-29 | 2021-12-31 | 洛阳乐邦石化设备有限公司 | Low-NOx low-CO high-efficiency energy-saving combustor |
| CN116086176A (en) * | 2023-02-09 | 2023-05-09 | 天津大学 | Device and process for modifying calcined clay of low-carbon environment-friendly tunnel kiln |
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| US6422858B1 (en) * | 2000-09-11 | 2002-07-23 | John Zink Company, Llc | Low NOx apparatus and methods for burning liquid and gaseous fuels |
| CN101694297A (en) * | 2009-10-23 | 2010-04-14 | 洛阳瑞昌石油化工设备有限公司 | Forced-draft burner and method for regularizing side-combustion high-temperature preheated air of square-box furnace |
| CN102393018A (en) * | 2011-11-20 | 2012-03-28 | 中国石油化工股份有限公司 | Gas combustor for low-nitric oxide emission at bottom of cracking furnace |
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| CN205504984U (en) * | 2016-04-01 | 2016-08-24 | 北京佳德昌科技有限责任公司 | Gas recirculation low NOx burner in gas injection type stove |
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2016
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6422858B1 (en) * | 2000-09-11 | 2002-07-23 | John Zink Company, Llc | Low NOx apparatus and methods for burning liquid and gaseous fuels |
| CN101694297A (en) * | 2009-10-23 | 2010-04-14 | 洛阳瑞昌石油化工设备有限公司 | Forced-draft burner and method for regularizing side-combustion high-temperature preheated air of square-box furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287836A (en) * | 2016-11-21 | 2017-01-04 | 柳惠斌 | A kind of quiet burner |
| CN106287836B (en) * | 2016-11-21 | 2023-09-26 | 上海焦耳波动节能环保科技有限公司 | Mute furnace end |
| CN107062214A (en) * | 2017-05-10 | 2017-08-18 | 北京航天石化技术装备工程有限公司 | A kind of indifferent gas half premixes the ultralow NOx gas burners of classification |
| CN107990315A (en) * | 2017-11-24 | 2018-05-04 | 北京拓首能源科技股份有限公司 | A kind of low-nitrogen discharged fuel gun of Furnace burner center fire |
| CN107990315B (en) * | 2017-11-24 | 2024-01-05 | 北京拓首能源科技股份有限公司 | Central ignition low-nitrogen emission fuel gun for process heating furnace burner |
| CN113864774A (en) * | 2021-09-29 | 2021-12-31 | 洛阳乐邦石化设备有限公司 | Low-NOx low-CO high-efficiency energy-saving combustor |
| CN116086176A (en) * | 2023-02-09 | 2023-05-09 | 天津大学 | Device and process for modifying calcined clay of low-carbon environment-friendly tunnel kiln |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160511 |
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| RJ01 | Rejection of invention patent application after publication |