CN205065703U - Heating furnace hangs down NOX flue gas recirculation oxygen boosting burner - Google Patents
Heating furnace hangs down NOX flue gas recirculation oxygen boosting burner Download PDFInfo
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- CN205065703U CN205065703U CN201520718157.8U CN201520718157U CN205065703U CN 205065703 U CN205065703 U CN 205065703U CN 201520718157 U CN201520718157 U CN 201520718157U CN 205065703 U CN205065703 U CN 205065703U
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- CN
- China
- Prior art keywords
- flue gas
- flue
- oxygen
- gas recirculation
- heating furnace
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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
- Y02E20/32—Direct CO2 mitigation
-
- 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 utility model relates to a heating furnace hangs down NOx flue gas recirculation oxygen boosting burner, including a flue collector and a flue gas recirculation flue, heating furnace exhanst gas outlet and chimney are connected to the flue collector, are equipped with the coal gas heat exchanger on it, a flue gas recirculation flue is drawn forth from the flue collector that is close to the heating furnace exhanst gas outlet, connects the heating furnace nozzle through the flue gas recirculation draught fan, establish the oxygen injecting ware in being close to the flue gas recirculation flue on one side of the nozzle, the oxygen injecting ware is in addition through oxygen duct connections oxygen pipe network, cross -section flaring shape mixing section is established to a flue gas recirculation flue in oxygen injecting ware the place ahead, establishes the nitrogen purging pipe on the flue gas recirculation flue at oxygen injecting ware rear. The utility model discloses the infeeding of N2 in the reducible combustion -supporting gas, reduce the flue gas by a wide margin in NOx generate, with residual heat from flue gas, the emission of flue gas has reduced substantially, both can improve the utilization ratio of fuel, emission that again can greatly reduced NOx, enrichment simultaneously in flue gas CO2 concentration, be favorable to CO2 recycle.
Description
Technical field
The utility model relates to industrial furnace field of combustion technology, particularly relates to a kind of heating furnace for heater for rolling steel low NOx flue gas recirculation oxygen-enriched burning device.
Background technology
Heater for rolling steel discharge that the heat taken out of of flue gas accounts for that fuel provides heat about 40%, in heat loss, proportion is maximum, and smoke components is N mainly
2/ CO
2/ H
2o, wherein N
2the ratio accounted for is maximum, is generally about 60%, CO
2/ H
2o is the generating component of fuel combustion chemical reaction, and N
2be along with combustion air with 79% bring in stove at high proportion, N
2for not participating in the inert gas burnt, entering in stove and only can bring the negative effect of two aspects: one is N in flue gas
2the ratio accounted for is maximum, and the heat taken away is maximum; Two be under high temperature with O
2easy production NOx harmful substance, pollutes air.If N useless in combustion air
2remove, will greatly reduce the volume of flue gas, reduce the heat loss that flue gas is taken away, clean flue gas, alleviates atmosphere pollution.From device structure, body of heater size can also be reduced, more be conducive to controlling in-furnace temperature uniformity.
Current heating furnace seldom adopts flue gas recirculation mode, only flue gas recirculation technology, adopt be negative pressure that flue gas is formed by burner high velocity jet by flue gas recirculation to burner root, after mixing with fresh burner gaseous mixture, spray in stove, object is desalination flame part flammable area atmosphere, reduces the generation of high-temperature region NOx again, it, by nature draft circulating flue gas, still can not make N
2a large amount of minimizing, heating furnace heat loss cannot fundamentally reduce.
The oxygen-enriched combustion technology that current heating furnace adopts increases O in combustion air
2concentration, dilute N
2concentration, improve efficiency of combustion, decrease exhaust gas volumn, improve fuel availability to a certain extent.But in combustion air, O
2the ratio accounted for is higher, N
2content could be lower.Generally for the technological requirement of the highest 1300 DEG C of heating furnace, oxygen enrichment percentage 35% can meet the demands, and the effect of oxygen enrichment percentage heating furnace raising more than 40% pair temperature, the reduction thermal efficiency is not obvious.At this moment N
2content still account for about 60%.Thus, N in combustion air is reduced
2content, still have very large energy-saving potential.
Application number is the Chinese patent of 200910037908.9 (applying date is on March 16th, 2009), disclose one " flue gas recirculation high temperature air energy-saving and environmental protection combustion technology ", what adopt is mode flue gas recirculation being implemented blending to combustion air, realize a kind of oxygen deprivation high-temp combustion, stabilize theoretical flame temperature, reduce NOx and generate.But because combustion air directly enters stove, still have the N2 of 79% to mix in flue gas, exhaust gas volumn does not reduce, and heat loss is larger.
Application number is the Chinese patent of 03108589.X (applying date is on March 31st, 2003), disclose the technical scheme of " exhaust gas circulating utilization heating device and application " by name, adopt " flue gas heat pump " by flue gas recirculation as heating furnace thermal source, saving energy.But do not consider to reduce N in flue gas
2content, N
2the heat taken away is still larger.
In interim " flue gas directly enters the energy-conserving action of the stove circulation " literary composition delivered of " energy supply for metallurgy " nineteen ninety-five 18 volume 3, propose to utilize burner injection burner hearth flue gas directly to enter feasibility and the energy-conserving action of stove circulation.But by burner self ejector action, exhaust gas volumn is uncontrollable, and internal circulating load is limited, so energy-saving effect is little, does not solve yet and reduce a large amount of inert gas N in flue gas
2problem.
In " in flue gas self-loopa heating furnace, preheated air temperature is on the impact of the combustion process " literary composition delivered in " industrial furnace " Vol.34No.1Jan.2012, propose flue gas directly to suck in burner, for preheated air temperature, the flue gas formed in stove remains containing N
2amount is comparatively large, and flue gas volume does not reduce, and the flue gas heat loss reduction discharged out of the furnace realizes by reducing temperature.Because heating furnace structure does not reduce, plant equipment still needs to consume larger energy.
Summary of the invention
The utility model provides a kind of heating furnace low NOx flue gas recirculation oxygen-enriched burning device, the part of smoke that heating furnace is discharged is circulated, mix simultaneously oxygen carry out being mixed to form oxygen content be 21% ~ 30% mist send into burner as combustion-supporting gas, through circulating several times, N in combustion-supporting gas
2concentration ratio reduce gradually, finally substantially emptying; The utility model can reduce N in combustion-supporting gas
2infeed, considerably reduce NOx in flue gas and generate; Because flue gas recirculation utilizes, drastically reduce the area the discharge capacity of flue gas, by flue gas waste heat recovery, both can improve the utilization rate of fuel, greatly can reduce again the discharge of NOx, CO in Sync enrichment flue gas
2concentration, is conducive to CO
2recycle.
In order to achieve the above object, the utility model realizes by the following technical solutions:
A kind of heating furnace low NOx flue gas recirculation oxygen-enriched burning device, comprises flue collector and flue gas recirculation branch flue, and described flue collector connects flue gas of heating furnace outlet and chimney, which is provided with gas change heater; Flue gas recirculation branch flue is drawn from the flue collector near flue gas of heating furnace exit, connects heating furnace burner by flue gas recirculation air-introduced machine; In the flue gas recirculation branch flue of burner side, establish plurality of oxygen injectors, plurality of oxygen injectors connects oxygen pipe network additionally by oxygen conveying pipe; The flue gas recirculation branch flue in plurality of oxygen injectors front establishes cross section gradually expanded form mixing section, and the flue gas recirculation branch flue at plurality of oxygen injectors rear establishes nitrogen sparge tube.
Described oxygen conveying pipe is provided with oxygen blind plate stop valve, flow control valve, flow-through orifice, two-stage decompression valve group, filter and oxygen stop valve from plurality of oxygen injectors one end successively to oxygen pipe network direction.
Flue gas recirculation branch flue before described flue gas recirculation air-introduced machine is established flue gas switch control valve.
Described plurality of oxygen injectors is provided with Laval nozzle.
The liner of high-temperature-resistant thermal-insulation material is provided with in described flue gas recirculation branch flue.
Compared with prior art, the beneficial effects of the utility model are:
1) part of smoke that heating furnace is discharged is recycled, to utilize in steel plant the oxygen content of rich oxygen replenishment flue gas simultaneously, flue gas mix oxygen carry out mixing rear formation oxygen content be 21% ~ 30% mist send into burner and use as combustion-supporting gas;
2) N in conventional combustion air is reduced
2content, avoid at high temperature generating a large amount of NOx in stove, through circulating several times, in combustion-supporting gas, the concentration ratio of N2 reduces gradually, finally substantially emptying (N
2content reduce to less than 1%);
3) utilized and Rich Oxygen Combustion by flue gas recirculation, drastically reduce the area the discharge capacity of flue gas, by flue gas waste heat recovery, both can improve the utilization rate of furnace fuel, greatly can reduce again the discharge capacity of NOx in flue gas of heating furnace, reduce atmosphere pollution; CO in Sync enrichment flue gas
2concentration, is conducive to CO
2recycle.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1. heating furnace 2. gas change heater 3. flue collector 4. chimney 5. flue gas recirculation branch flue 6. flue gas switches control valve 7. flue gas recirculation air-introduced machine 8. burner 9. oxygen pipe network 10. two-stage decompression valve group 11. oxygen stop valve 12. filter 13. flow-through orifice 14. flow control valve 15. oxygen blind plate stop valve 16. plurality of oxygen injectors 17. mixing section 18. nitrogen sparge tube 19. gas piping
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described further:
See Fig. 1, be the structural representation of device described in the utility model, a kind of heating furnace of the utility model low NOx flue gas recirculation oxygen-enriched burning device, comprises flue collector and flue gas recirculation branch flue, described flue collector connects flue gas of heating furnace outlet and chimney, which is provided with gas change heater; Flue gas recirculation branch flue is drawn from the flue collector near flue gas of heating furnace exit, connects heating furnace burner by flue gas recirculation air-introduced machine; In the flue gas recirculation branch flue of burner side, establish plurality of oxygen injectors, plurality of oxygen injectors connects oxygen pipe network additionally by oxygen conveying pipe; The flue gas recirculation branch flue in plurality of oxygen injectors front establishes cross section gradually expanded form mixing section, and the flue gas recirculation branch flue at plurality of oxygen injectors rear establishes nitrogen sparge tube.
Described oxygen conveying pipe is provided with oxygen blind plate stop valve, flow control valve, flow-through orifice, two-stage decompression valve group, filter and oxygen stop valve from plurality of oxygen injectors one end successively to oxygen pipe network direction.
Flue gas recirculation branch flue before described flue gas recirculation air-introduced machine is established flue gas switch control valve.
Described plurality of oxygen injectors is provided with Laval nozzle.
The liner of high-temperature-resistant thermal-insulation material is provided with in described flue gas recirculation branch flue.
Flue gas recirculation oxygen-enriched combusting method based on a kind of heating furnace of the utility model low NOx flue gas recirculation oxygen-enriched burning device is as follows:
1) flue gas of discharging from flue gas of heating furnace outlet is divided into two-way, and a road flue gas enters flue collector, and discharges from chimney after gas change heater and coal gas heat exchange; Another road flue gas enters flue gas recirculation branch flue from the entrance flue collector under the effect of flue gas recirculation air-introduced machine, after switching control valve adjust flux, is sent to heating furnace burner side by flue gas;
2) from the oxygen that the oxygen pipe network in steel plant exports, after being filtered, by two-stage decompression valve group, pressure is dropped to 0.1 ~ 0.12MPa, again by oxygen flow rate adjusting valve adjust flux, spray in circulating flue gas by the Laval nozzle of plurality of oxygen injectors, oxygen, after mixing section fully mixes with flue gas, forms oxygen content at the mist of 21% ~ 30%, then sends into burner and to mix with coal gas as combustion air and burn;
3) oxygen conveying pipe at plurality of oxygen injectors rear is provided with nitrogen sparge tube, when oxygen stops, for fashionable, passing into low temperature nitrogen protection.
The exhaust gas volumn being introduced circulation branch flue by flue gas recirculation air-introduced machine is that 50% ~ 60% of total exhaust gas volumn discharged by heating furnace.
Burner (burner) place of heating furnace has 3 kinds of gas and vapor permeation, and wherein circulating flue gas and oxygen are first through fully mixing as combustion-supporting gas, carry out mixing after-combustion again implement heat effect to heating furnace before burner with coal gas.The gas piping other end is connected with the gas change heater on flue collector, can heat coal gas.Oxygen is by being located at the plurality of oxygen injectors ejection in circulation branch flue, and the oxygen conveying pipe that plurality of oxygen injectors connects is drawn from oxygen pipe network and is inserted into circulation branch flue.The circulation branch flue in plurality of oxygen injectors ejection region establishes mixing section, pipeline section along oxygen emission direction expands gradually, be conducive to the Homogeneous phase mixing of 2 kinds of gases, the oxygen that pressure is higher simultaneously sprays in flue gas, add the momentum of circulating flue gas, make mixed gas be enough to overcome resistance loss of pipeline, the pressure requirements of burner to combustion-supporting gas can be met.For burning out plurality of oxygen injectors when flue-gas temperature after preventing blowing out does not lower, the circulation branch flue after oxygen blind plate stop valve arranges nitrogen sparge tube, when oxygen stops, for fashionable, passing into low temperature nitrogen protection.
Following examples are implemented under premised on technical solutions of the utility model, give detailed embodiment and concrete operating process, but protection domain of the present utility model are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[embodiment 1]
The present embodiment adopts the batch-type furnace being used for hot test, and hearth area is 4m × 2m, and adopt mixed gas to burn, heating-up temperature can reach 1250 DEG C.
For simulating the flue-gas temperature of coming out of the stove of actual heating furnace, experimental furnace temperature controls at 1000 DEG C, discharges flue-gas temperature and controls at 950 DEG C.Flue gas divides two-way to walk, one tunnel enters chimney by flue collector and discharges after gas change heater, another road adopts air-introduced machine by the flue gas suction flue gas recirculation arm of 60%, then mix with purity oxygen, formed oxygen content 30% gaseous mixture, send into burner, as the combustion-supporting gas of burner, mix with mixed gas and burn.
Originally trial furnace adopts air preheater Mist heat recovering, air preheating temperature is 500 DEG C, the final heat loss of flue gas is 1360980kJ/h, after adopting the utility model, the flue gas of 60% recycles, and the flue gas of other 40% enters heat exchanger preheating gas, gas preheating temperature is 280 DEG C, the heat loss that flue gas is taken away reduces to 879393kJ/h, reduces heat loss 35.39%, gas saving 19.2%.
[embodiment 2]
Adopt hot-rolling heating furnace in the present embodiment, actual heating capacity is 238.8t/h, and original technique is for adopting calorific value to be 8360kJ/Nm
3the mixed coal gas of height Jiao be fuel, flue is arranged symmetrically with two.Adopt normal air to be combustion air and coal gas mixed combustion, flue gas is all gone out from smoke stack emission, and the heat that flue gas is taken out of is 370408.21kJ/t.
After adopting the utility model, when oxygen concentration is 21%, the flue gas of 55% recycles, and the exhaust gas volumn of going out from smoke stack emission reduces to 45%, and the heat that flue gas is taken out of is 148163kJ/t.Originally the gas unit consumption of heating furnace is 180.69m3/t steel, reduces 26.47m3/t, reduce 14.65% after improvement.
[embodiment 3]
Adopt hot-rolling heating furnace in the present embodiment, actual heating capacity is 238.8t/h, and employing calorific value is 8360kJ/Nm
3the mixed coal gas of height Jiao be fuel, flue is for being arranged symmetrically with two.
Former technique adopts normal air to be combustion air and coal gas mixed combustion, and flue gas is all gone out from smoke stack emission, and the heat that flue gas is taken out of is 370408.21kJ/t.
After adopting the utility model, when oxygen concentration is 25%, the flue gas of 50% recycles, and the exhaust gas volumn of going out from smoke stack emission reduces to 50%, and the heat that flue gas is taken out of is 144721kJ/t.Originally the gas unit consumption of heating furnace is 180.69m3/t steel, reduces 26.88m3/t, reduce 14.88% after improvement.
Claims (5)
1. a heating furnace low NOx flue gas recirculation oxygen-enriched burning device, is characterized in that, comprises flue collector and flue gas recirculation branch flue, and described flue collector connects flue gas of heating furnace outlet and chimney, which is provided with gas change heater; Flue gas recirculation branch flue is drawn from the flue collector near flue gas of heating furnace exit, connects heating furnace burner by flue gas recirculation air-introduced machine; In the flue gas recirculation branch flue of burner side, establish plurality of oxygen injectors, plurality of oxygen injectors connects oxygen pipe network additionally by oxygen conveying pipe; The flue gas recirculation branch flue in plurality of oxygen injectors front establishes cross section gradually expanded form mixing section, and the flue gas recirculation branch flue at plurality of oxygen injectors rear establishes nitrogen sparge tube.
2. a kind of heating furnace according to claim 1 low NOx flue gas recirculation oxygen-enriched burning device, it is characterized in that, described oxygen conveying pipe is provided with oxygen blind plate stop valve, flow control valve, flow-through orifice, two-stage decompression valve group, filter and oxygen stop valve from plurality of oxygen injectors one end successively to oxygen pipe network direction.
3. a kind of heating furnace according to claim 1 low NOx flue gas recirculation oxygen-enriched burning device, is characterized in that, the flue gas recirculation branch flue before described flue gas recirculation air-introduced machine is established flue gas switch control valve.
4. a kind of heating furnace according to claim 1 low NOx flue gas recirculation oxygen-enriched burning device, it is characterized in that, described plurality of oxygen injectors is provided with Laval nozzle.
5. a kind of heating furnace according to claim 1 low NOx flue gas recirculation oxygen-enriched burning device, is characterized in that, is provided with the liner of high-temperature-resistant thermal-insulation material in described flue gas recirculation branch flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520718157.8U CN205065703U (en) | 2015-09-17 | 2015-09-17 | Heating furnace hangs down NOX flue gas recirculation oxygen boosting burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520718157.8U CN205065703U (en) | 2015-09-17 | 2015-09-17 | Heating furnace hangs down NOX flue gas recirculation oxygen boosting burner |
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|---|---|
| CN205065703U true CN205065703U (en) | 2016-03-02 |
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|---|---|---|---|
| CN201520718157.8U Expired - Fee Related CN205065703U (en) | 2015-09-17 | 2015-09-17 | Heating furnace hangs down NOX flue gas recirculation oxygen boosting burner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545846A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of low NO of heating furnacexFlue gas recirculation oxygen-enriched burning device and method |
| CN110793032A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Oxygen-enriched combustion system of heating furnace and control method thereof |
| CN112210630A (en) * | 2019-07-12 | 2021-01-12 | 北京碧海云新能源科技有限公司 | Nitrogen-free combustion process for blast furnace and heating furnace and use method thereof |
-
2015
- 2015-09-17 CN CN201520718157.8U patent/CN205065703U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545846A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of low NO of heating furnacexFlue gas recirculation oxygen-enriched burning device and method |
| CN112210630A (en) * | 2019-07-12 | 2021-01-12 | 北京碧海云新能源科技有限公司 | Nitrogen-free combustion process for blast furnace and heating furnace and use method thereof |
| CN110793032A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Oxygen-enriched combustion system of heating furnace and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20210917 |