CN109611830A - For firing the flue gas recirculation device and method of coke-stove gas - Google Patents
For firing the flue gas recirculation device and method of coke-stove gas Download PDFInfo
- Publication number
- CN109611830A CN109611830A CN201811606657.7A CN201811606657A CN109611830A CN 109611830 A CN109611830 A CN 109611830A CN 201811606657 A CN201811606657 A CN 201811606657A CN 109611830 A CN109611830 A CN 109611830A
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- Prior art keywords
- flue gas
- smoke
- flue
- boiler
- coke
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
- F23M9/003—Baffles or deflectors for air or combustion products; Flame shields in flue gas ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of for firing the flue gas recirculation device and method of coke-stove gas, belong to the flue gas recirculation field of combustion coke-stove gas, technical problems to be solved are how to guarantee that flue gas generates in reasonable flow rate to maximally utilize rate, nitrogen oxides is effectively reduced: its structure includes air-introduced machine and smoke duct, pot inner flue gas of the stove is discharged into chimney by smoke duct by air-introduced machine, it further include flue, entrance is connected to smoke duct；Regulating valve is set on flue；Booster fan, the outlet with flue；Flue gas lateral is connected to booster fan and between boiler side burner；Pipeline air-valve is set on flue gas lateral.Its method is, as flue gas recycled, after pressurizeing to flue gas recycled, the flue gas recycled after pressurization to be introduced by the fume extraction part in boiler emission to chimney in the burner for being located at boiler side.It can guarantee that flue gas generation maximally utilizes rate, and nitrogen oxides is effectively reduced.
Description
Technical field
The present invention relates to the flue gas recirculation fields of combustion coke-stove gas, are particularly used for the flue gas of combustion coke-stove gas again
Circulator and method.
Background technique
Fuel, which enters in the burner of insulation nitrogen therein after burning, to gasify, and temperature difference causes oxynitrides to account for
The compound ratio of total nitrogen is also different.When temperature is 800~900 DEG C, the compound ratio that oxynitrides accounts for total nitrogen is 30%；
When temperature is 1000 DEG C, the compound ratio that oxynitrides accounts for total nitrogen accounts for 50%~60%.Therefore it reduces as far as possible primary
Wind makes lower part primary zone be in anaerobic condition, it is possible to reduce the generation of NO.But due to having maintained the mixing speed of fuel and air
Degree, the infeed amount of First air have the requirement of minimum numerical value, are introduced into the relatively low flue gas of oxygen content and are mixed into First air, can be not
The oxygen that primary zone is fed is reduced while reducing total blast volume, lower part primary zone is in anaerobic condition, and can still maintain just
Often burning, to significantly reduce the discharge of NOx.
Flue gas recirculation method used at present is to extract a part of low-temperature flue gas before the air preheater of boiler directly to connect
Enter after blower inlet is mixed with air-supply and be sent into furnace, can not only reduce ignition temperature in this way, and also reduce oxygen concentration,
Thereby reduce the concentration of emission of NOx.The effect that flue gas recirculation method reduces NOx emission has with fuel band and flue gas recirculation
It closes.Experience have shown that the NOx emission concentration of gas furnace can reduce by the drop of 40% or more, NOx when flue gas recirculation rate is 10-15%
Low rate increases with the increase of flue gas recirculation rate, and related with fuel type and ignition temperature, and ignition temperature is higher, cigarette
Influence of the gas recirculation rate to NOx reduction rate is bigger.Flue gas recycled amount and the ratio between exhaust gas volumn when not using flue gas recirculation,
Referred to as flue gas recirculation rate, gas fired-boiler flue gas recirculation rate general control is in 10-30%, when using higher flue gas recirculation
When rate, burning can be unstable, and imperfect combustion heat loss will increase.
How to guarantee that flue gas generates in reasonable flow rate and maximally utilize rate, nitrogen oxides is effectively reduced, is to need to solve
The technical issues of.
Summary of the invention
Technical assignment of the invention is against the above deficiency, to provide a kind of for firing the flue gas recirculation device of coke-stove gas
And method, it maximally utilizes rate to solve the problem of how to guarantee that flue gas generates in reasonable flow rate nitrogen oxides is effectively reduced.
In a first aspect, the embodiment of the present invention provides the flue gas recirculation device for firing coke-stove gas, including air-introduced machine and
Pot inner flue gas of the stove is discharged into chimney by smoke duct by smoke duct, air-introduced machine, further includes: flue, entrance and smoke evacuation
Air duct connection, for extracting flue gas out of smoke duct as flue gas recycled；Regulating valve is set on flue, is used for
Adjust the exhaust gas volumn of the flue gas recycled extracted；Booster fan, the outlet with flue, for flue gas recycled
Pressurization；Flue gas lateral, is connected to booster fan and between boiler side burner, for drawing flue gas recycled
Enter burner；Pipeline air-valve is set on flue gas lateral, for adjusting the flue gas between flue gas lateral and burner
Air quantity.
In the prior art, the flue gas generated in boiler is discharged into chimney by air-introduced machine and smoke duct cooperation, this reality
It applies in mode, flue is connected on smoke duct, extension flue gas passes through booster fan pair as flue gas recycled
Flue gas recycled pressurization, then the flue gas recycled after pressurization is inputted to the burner for being located at boiler side by flue gas lateral
It is interior, it realizes the recycling of flue gas, generates maximized utilization rate, effectively reduce nitrogen oxides.
Preferably, burner totally two, two burners are located relatively at the two sides of boiler, each burner by with its
Corresponding flue gas lateral is connected to booster fan.
Preferably, for firing the flue gas recirculation device of coke-stove gas further include: Secondary Air smoke pipeline is connected to flue gas
The top combustion zone of thorax in lateral and boiler；Secondary wind and smoke valve, is set on Secondary Air smoke pipeline, for adjusting by two
The flue gas air quantity of thorax in secondary wind and smoke pipeline to boiler.
In the preferred embodiment, flue gas is introduced to the top combustion zone of thorax in boiler by Secondary Air smoke pipeline, made
It is combustion-supporting to flue gas in burner for combustion air.
Preferably, Secondary Air smoke pipeline is multiple altogether, and secondary wind and smoke valve is provided on each Secondary Air smoke pipeline.
Preferably, flue is inserted into smoke duct in the way of angle by its entrance.
Preferably, booster fan is frequency conversion fan.
Second aspect, the embodiment of the present invention provide the flue gas recirculation method for firing coke-stove gas, comprising: will be by boiler
The fume extraction in chimney is emitted into as flue gas recycled, after pressurizeing to flue gas recycled, by the recycling after pressurization
Flue gas introduces in the burner for being located at boiler side.
It, will based on the flue gas recirculation device for being used to fire coke-stove gas that first aspect provides in the preferred embodiment
The flue gas being discharged in boiler is drawn to be imported in boiler as flue gas recycled, can be reduced the concentration of emission of NOx, be realized that NOx's is low
Discharge.
Preferably, the flue gas recycled after a part pressurization is drawn and is used as secondary wind and smoke, secondary wind and smoke is introduced into boiler
The top combustion zone of interior thorax.
In the preferred embodiment, part of smoke enters burning in the burner of boiler side, and another part flue gas introduces
The top combustion zone of thorax, plays combustion-supporting effect in boiler, it is ensured that the full combustion of flue gas, generation maximally utilize rate, have
Effect reduces nitrogen oxides.
It more selects, by secondary wind and smoke to introduce respectively and introduce the upper of thorax in boiler in a manner of every place's flue gas wind speed is adjustable
Portion combustion zone.
Flue gas recirculation device and method for firing coke-stove gas of the invention has the advantage that
1, flue gas is introduced by boiler by chimney by air-introduced machine and smoke duct, and through flue out of smoke duct
Extraction section flue gas pressurizes to flue gas recycled as flue gas recycled, by booster fan, passes through flue gas lateral
Flue gas recycled is imported in the burner for being located at boiler side and recycled, flue gas can be recycled, improved flue gas utilization rate, be effectively reduced
Nitrogen oxides；
2, a part of flue gas recycled is drawn as secondary wind and smoke by Secondary Air smoke pipeline, and secondary wind and smoke is introduced into pot
The top combustion zone of thorax in furnace, the secondary wind and smoke in the part can be combustion-supporting；
3, booster fan is frequency conversion fan, is cooperated with the regulating valve being located on flue, adjustable recirculation flue gas
Flue gas air quantity；
4, flue gas lateral and burner is adjusted by pipeline air-valve in the connecting pipe air-valve on flue gas lateral
Between flue gas air quantity, convenient for setting the flue gas wind speed of flue gas recycled according to demand；
5, by flue gas wind speed in secondary wind and smoke valve adjustable second wind smoke pipeline, convenient for adjusting different secondary wind and smoke pipeline
Interior flue gas wind speed is embodied as thorax in boiler and provides reasonable air distribution.
Detailed description of the invention
It, below will be to required in being described in embodiment in order to more clearly illustrate the technical solution in the embodiment of the present invention
The attached drawing used is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings
His attached drawing.
The following further describes the present invention with reference to the drawings.
Attached drawing 1 is the structural schematic diagram for the flue gas recirculation device that embodiment 1 is used to fire coke-stove gas；
In figure: 1, air-introduced machine, 2, smoke duct, 3, regulating valve, 4, booster fan, 5, chimney, 6, flue gas lateral, 7,
First secondary wind and smoke valve, 8, second secondary wind and smoke valve, 9, the secondary wind and smoke valve of third, 10, pipeline air-valve, 11, burner, 12, pot
Furnace.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention, the case where not conflicting
Under, the technical characteristic in the embodiment of the present invention and embodiment can be combined with each other.
It is to be appreciated that in the description of the embodiment of the present invention, the vocabulary such as " first ", " second " are only used for distinguishing and retouch
The purpose stated, is not understood to indicate or imply relative importance, can not be interpreted as indication or suggestion sequence.In the present invention
" multiple " in embodiment, refer to two or more.
The embodiment of the present invention provides the flue gas recirculation device and method for firing coke-stove gas, how to guarantee for solving
Flue gas generates the technical issues of maximally utilizing rate, nitrogen oxides is effectively reduced in reasonable flow rate.
Embodiment 1:
The flue gas recirculation device for being used to fire coke-stove gas of the invention, including air-introduced machine 1, smoke duct 2, fume pipe
Road, regulating valve 3, booster fan 4, flue gas lateral 6 and pipeline air-valve 10, air-introduced machine 1 are connected to for by pot with smoke duct 2
Flue gas introduces in chimney 5 in furnace 12, and flue is inserted into smoke duct 2 in such a way that its entrance is in 30 DEG C of angles, and pressurize wind
The entrance of machine 4 and the outlet of flue, the connection of flue gas lateral 6 is in booster fan 4 and the combustion for being located at 12 side of boiler
Between burner 11, pipeline air-valve 10 be located at flue gas lateral 6 between burner 11, pass through pipeline air-valve 10 adjust input
Flue gas wind speed in burner 11.
Wherein, the entrance gas cutting of flue is 30 DEG C of angles, which is inserted into about 1500mm in smoke duct 2,
Convenient between flue and smoke duct 2 flue gas it is smooth.By flue, extraction section flue gas is made out of smoke duct 2
For flue gas recycled, flue gas recycled is imported in combustion chamber and is recycled.
Booster fan 4 is frequency conversion fan, is pressurizeed by the booster fan 4 to flue gas recycled, in order to follow again
Ring flue gas imports in the combustion chamber for being located at 12 side of boiler.
Flue gas lateral 6 totally two, two flue gas laterals 6 are located relatively at the two sides of boiler 12, each flue gas point
A pipeline air-valve 10 is provided on branch pipe(tube) 6, which is the pipeline valve of model DN125, pipeline air-valve
10 are arranged in flue gas branch valve at the port of combustion chamber, for adjusting the cigarette between flue gas lateral 6 and combustion chamber
Gas wind speed.
This is used to fire the flue gas recirculation device working method of coke-stove gas are as follows: through flue from smoke duct 2
Extraction section flue gas is as flue gas recycled, after being pressurizeed by booster fan 4 to flue gas recycled, flue gas recycled is sent into and is fired
It is recycled in burning, to reduce discharged nitrous oxides.
When extracting flue gas out of smoke duct 2, load can be used according to boiler 12, pass through regulating valve 3, the pressurization of frequency conversion
Blower 4 and pipeline air-valve 10 adjust the amount extracted, and control introduces flue gas air quantity.
As further improvement of this embodiment, there are three Secondary Air smoke pipeline, the respectively first secondary wind and smoke for setting
Pipeline, second secondary wind and smoke pipeline and third Secondary Air smoke pipeline, above three Secondary Air smoke pipeline are from top to bottom connected to side by side
Between the top combustion zone of 12 cella of flue gas lateral 6 and boiler, one two is provided on each secondary wind and smoke pipeline
Secondary wind and smoke valve, the respectively first secondary wind and smoke valve 7, second secondary wind and smoke valve 8 and the secondary wind and smoke valve 9 of third, for adjusting by right
The Secondary Air smoke pipeline answered to 12 cella of boiler flue gas air quantity.Wherein secondary wind and smoke valve is the pipeline valve of model DN50.
It is full-gear when pipeline air-valve 10 uses, the first secondary wind and smoke valve 7 is 1/4 using aperture, second secondary wind and smoke
Aperture is 1/2 when valve 8 uses, and aperture is 3/4 when the secondary wind and smoke valve 9 of third uses.
In the improved embodiment, by pipeline air-valve 10 using 2 inner part flue gas recycled of smoke duct as master
It is introduced in combustion chamber with wind and smoke, by Secondary Air smoke pipeline and secondary wind and smoke valve using another part flue gas recycled as combustion air
The top combustion zone of 12 cella of boiler is introduced, is that combustion chamber is combustion-supporting.And the combustion air is introduced in boiler 12 in a manner of dividing at three
The top combustion zone of hall.
Embodiment 2:
The flue gas recirculation method for being used to fire coke-stove gas of the invention, comprising: will be emitted into chimney 5 by boiler 12
Fume extraction is as flue gas recycled, after pressurizeing to flue gas recycled, the flue gas recycled after pressurization is introduced and is located at pot
In the burner 11 of 12 side of furnace.
This method is realized based on the flue gas recirculation device for firing coke-stove gas that embodiment 1 provides, and passes through air-introduced machine 1
With smoke duct 2 cooperation by boiler 12 flue gas introduce chimney 5, by flue out of smoke duct 2 extraction section flue gas
It as flue gas recycled, is pressurizeed by booster fan 4 to flue gas recycled, flue gas recycled is passed through into flue gas point after pressurization
Branch pipe(tube) 6 introduces in the combustion chamber for being located at 12 side of boiler, can reduce the concentration of emission of NOx, realize the low emission of NOx.
Again flue gas recirculation utilize during, according to boiler 12 use load, appropriate regulation regulating valve 3, booster fan 4 with
And pipeline air-valve 10, to control introducing flue gas air quantity.
As the further improvement of this method, the flue gas recycled after a part pressurization is drawn and is used as secondary wind and smoke, it will
Secondary wind and smoke introduces the top combustion zone of 12 cella of boiler.
In i.e. above-mentioned flue gas recycled, a part follows flue gas as main air distribution again, passes through flue gas lateral 6 and pipeline wind
Valve 10 introduces in combustion chamber.Another part flue gas recycled passes through Secondary Air smoke pipeline and secondary wind and smoke valve as combustion air
Cooperation introduces the top combustion zone of 12 cella of boiler.
To be sufficiently combustion-supporting, secondary wind and smoke is introduced into boiler 12 in a manner of introducing at points three and every place's flue gas wind speed is adjustable
The top combustion zone of cella.
Secondary Air smoke pipeline there are three being connected between flue gas lateral 6 and the top combustion zone of 12 cella of boiler, often
Secondary wind and smoke valve is each equipped on a Secondary Air smoke pipeline, by above-mentioned assembly realize by secondary wind and smoke with divide at three introduce and often
Place's adjustable mode of flue gas wind speed introduces the top combustion zone of 12 cella of boiler.
Experiment proves that 12 oepration at full load of boiler is Nox discharge value before repacking are as follows:≤280mg/m3 is full after repacking
Nox discharge value when load operation are as follows:≤150mg/m3 is minimum to drop to 80mg/m3.Complying fully with existing Shandong Province, " boiler is big
Gas pollutant emission standard " DB37/2374-2018 discharge standard.
Embodiment described above is only to absolutely prove preferred embodiment that is of the invention and being lifted, protection model of the invention
It encloses without being limited thereto.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in the present invention
Protection scope within.Protection scope of the present invention is subject to claims.
Claims (9)
1. the flue gas recirculation device for firing coke-stove gas, including air-introduced machine and smoke duct, air-introduced machine pass through smoke duct
Pot inner flue gas of the stove is discharged into chimney, it is characterised in that further include:
Flue, entrance are connected to smoke duct, for extracting flue gas out of smoke duct as flue gas recycled；
Regulating valve is set on flue, for adjusting the exhaust gas volumn of the flue gas recycled extracted；
Booster fan, the outlet with flue, for pressurizeing to flue gas recycled；
Flue gas lateral, is connected to booster fan and between boiler side burner, for drawing flue gas recycled
Enter burner；
Pipeline air-valve is set on flue gas lateral, for adjusting the flue gas air quantity between flue gas lateral and burner.
2. according to claim 1 for firing the flue gas recirculation device of coke-stove gas, it is characterised in that burner totally two
A, two burners are located relatively at the two sides of boiler, and each burner passes through corresponding flue gas lateral and pressurization
Blower connection.
3. according to claim 1 or 2 for firing the flue gas recirculation device of coke-stove gas, it is characterised in that further include:
Secondary Air smoke pipeline is connected to the top combustion zone of thorax in flue gas lateral and boiler；
Secondary wind and smoke valve, is set on Secondary Air smoke pipeline, for adjusting by the flue gas of thorax in Secondary Air smoke pipeline to boiler
Air quantity.
4. according to claim 3 for firing the flue gas recirculation device of coke-stove gas, it is characterised in that Secondary Air smoke pipe
Road is multiple altogether, and secondary wind and smoke valve is provided on each Secondary Air smoke pipeline.
5. according to claim 1 or 2 for firing the flue gas recirculation device of coke-stove gas, it is characterised in that flue its enter
Mouth is that the mode of angle is inserted into the first flue.
6. according to claim 1 or 2 for firing the flue gas recirculation device of coke-stove gas, it is characterised in that booster fan is to become
Frequency blower.
7. the flue gas recirculation method for firing coke-stove gas, characterized by comprising: will be by the cigarette in boiler emission to chimney
Gas, which extracts, is used as flue gas recycled, after pressurizeing to flue gas recycled, the flue gas recycled after pressurization is introduced and is located at boiler
In the burner of side.
8. according to claim 7 for firing the flue gas recirculation method of coke-stove gas, it is characterised in that add a part
Flue gas recycled after pressure, which is drawn, is used as secondary wind and smoke, and secondary wind and smoke is introduced to the top combustion zone of thorax in boiler.
9. according to claim 8 for firing the flue gas recirculation method of coke-stove gas, it is characterised in that by secondary wind and smoke
By respectively introduce and often no place's flue gas wind speed it is adjustable in a manner of introduce the top combustion zone of thorax in boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811606657.7A CN109611830A (en) | 2018-12-27 | 2018-12-27 | For firing the flue gas recirculation device and method of coke-stove gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811606657.7A CN109611830A (en) | 2018-12-27 | 2018-12-27 | For firing the flue gas recirculation device and method of coke-stove gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109611830A true CN109611830A (en) | 2019-04-12 |
Family
ID=66011840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811606657.7A Pending CN109611830A (en) | 2018-12-27 | 2018-12-27 | For firing the flue gas recirculation device and method of coke-stove gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109611830A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN118009308A (en) * | 2024-04-10 | 2024-05-10 | 山西吉祥锅炉制造有限公司 | Boiler flue gas recirculation device |
-
2018
- 2018-12-27 CN CN201811606657.7A patent/CN109611830A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN118009308A (en) * | 2024-04-10 | 2024-05-10 | 山西吉祥锅炉制造有限公司 | Boiler flue gas recirculation device |
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