CN206890519U - A kind of big backflow low NO of high-temperature flue gas - Google Patents
A kind of big backflow low NO of high-temperature flue gas Download PDFInfo
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- CN206890519U CN206890519U CN201720577503.4U CN201720577503U CN206890519U CN 206890519 U CN206890519 U CN 206890519U CN 201720577503 U CN201720577503 U CN 201720577503U CN 206890519 U CN206890519 U CN 206890519U
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- flue gas
- fuel nozzle
- flow channel
- temperature flue
- air flow
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Abstract
A kind of big backflow low NO of high-temperature flue gas,It can be applicable to civilian and industrial furnace field,Including burner shell,Central cylinder is provided with the burner casing body,Third level fuel nozzle ports,Several fins to radially distribute,Second level fuel nozzle ports are distributed among several described fins,There are swirl vane and central cylinder air inlet in the rear portion of the central cylinder,There is inner sleeve the central cylinder front end,Inner ring air flow channel is formed between the inner sleeve and the central cylinder,Annular air cleft air flow channel is formed between outer sleeve and the inner sleeve,The front end of the annular air cleft air flow channel is provided with porous disc,The annular air cleft that the rear end of the annular air cleft air flow channel is formed between the outer sleeve and the inner sleeve,Outer shroud air flow channel is formed between the outer sleeve and the burner shell,There is first order fuel nozzle in the outer shroud air flow channel,First order fuel nozzle ports are towards the inwall of the burner shell.
Description
Technical field
The present invention relates to industrial gasses burner technology, such as low NO etc., more particularly to a kind of high-temperature flue gas
Big backflow low NO, the big backflow of high-temperature flue gas refer to that the combustion product gases i.e. high-temperature flue gas in burner hearth can circulate inflow
Recirculating zone in the stove formed by burner nozzle, the low nitrogen are to refer to reduce nitrogen oxides i.e. NOX generation and discharge.
Background technology
With Chinese society and economic fast development, energy resource consumption also quickly increases, and DS NOx Est amount is also constantly increasing
It is long, environmental problem getting worse, it has also become threaten one of principal element of human kind sustainable development.In recent years, country is to discharge
The requirement of index is more and more stricter, thus further control nitrogen oxides (NOX) discharge to national economy and environmental protection can
Sustainable development is most important.NOX generation is divided into three classes, respectively thermal NO X, Quick-type NOX, fuel type NOX.Natural gas
In nitrogen content it is relatively low, therefore NOx main sources are thermal NO x and Quick-type NOx.When thermal NO X is burning in air
N2 and O2 generate at high temperature, when concentration when its major influence factors has reaction temperature, N2 and the O2 to react and stop
Between, wherein the most key influence factor is reaction temperature.Quick-type NOx is that hydrocarbon group occurs in N2 and fuel in air
Caused by series reaction.
Low-NO_x combustion technology main at present has：The burning of low excess air coefficient, Researched of Air Staging Combustion Burning Pulverized Coal, fuel staging combustion
Burning, flue gas recirculation, flameless combustion, premixed combustion etc..Natural gas low-NO_x combustion technology mainly around reduce ignition temperature, so as to
Reduce thermal NO X generation development.The reduction of ignition temperature can by control combustion zone excess air coefficient come
Regulation, basic ideas are all burning is occurred under conditions of deviateing equivalent proportion and being 1, make burning in lean combustion or fuel-rich situation
Lower progress, so as to avoid the occurrence of area of localized hyperthermia, reduce thermal NO X generation.The reduction of ignition temperature can also pass through cigarette
Gas is recycled for realizing, flue gas recirculation includes circulation and flue gas outer circulation in flue gas.In flue gas circulation be by burner with
The special structure design of burner hearth, flue gas is set to produce backflow inside burner hearth；Flue gas outer circulation is from a certain position of boiler by flue gas
It is re-introduced into by external pipe in burner hearth, participates in combustion reaction.The purpose for adding flue gas recirculation is for flue gas
Combustion product be added in combustion zone, reduce ignition temperature, while add flue gas can reduce combustion zone oxygen point
Pressure, so as to weaken oxygen and the thermal NO X processes of nitrogen generation, the final discharge for reducing NOX.
The inventors discovered that several low NO technologies are all with their own characteristics at present, but each some problems.Example
Such as, combustible loss caused by the burning of low excess air coefficient is big, and boiler thermal output is low；Premixed combustion technology combustion instability, can
It can cause to be tempered or stop working；Flue gas recirculation can make decrease in oxygen partial pressure, and air velocity increase makes combustion instability, put out
Phenomena such as fire, vibration.
The content of the invention
The present invention is for defect or deficiency present in prior art, there is provided a kind of big backflow low nitrogen burning of high-temperature flue gas
Device, the big backflow of high-temperature flue gas refer to that the combustion product gases i.e. high-temperature flue gas in burner hearth can circulate inflow by burner nozzle shape
Into stove in recirculating zone, the low nitrogen is to refer to reduce nitrogen oxides i.e. NOX generation and discharge.The present invention, which has, has burnt
Entirely, the characteristics of combustion stability is good, and the thermal efficiency is high, and discharge is few, can be applicable to civilian and industrial furnace field.
Technical scheme is as follows：
A kind of big backflow low NO of high-temperature flue gas, it is characterised in that including burner shell, the burner shell
Rear end there is the connecting interface of connection air intake section, be provided with central cylinder, centered cylinder in the burner casing body
The centre of body front end is provided with third level fuel nozzle ports, and several that radially distribute are provided with along the centre
Fin, second level fuel nozzle ports are distributed among several described fins, by preceding on the rear portion outer peripheral face of the central cylinder
Swirl vane and central cylinder air inlet are disposed with backward, are provided with the outer peripheral face of the central cylinder front end interior
Sleeve, inner ring air flow channel is formed between the inner sleeve and the central cylinder, be provided with the outside of the inner sleeve outer
Sleeve, forms annular air cleft air flow channel between the outer sleeve and the inner sleeve, before the annular air cleft air flow channel
End is provided with porous disc, the ring that the rear end of the annular air cleft air flow channel is formed between the outer sleeve and the inner sleeve
Shape air cleft, outer shroud air flow channel is formed between the outer sleeve and the burner shell, is set in the outer shroud air flow channel
There is a first order fuel nozzle, the first order fuel nozzle ports of the first order fuel nozzle are towards in the burner shell
Wall.
The first order fuel nozzle ports are located on the front end outer peripheral face of the first order fuel nozzle.
Housing forward end inwall blade is provided with the burner casing body.
The outer sleeve is tubaeform with the inner sleeve；Or the outer sleeve is tubaeform, the inner sleeve
Inwall is straight barrel type and outer wall is taper；The slit width of the annular air cleft passes through the axle between the outer sleeve and the inner sleeve
Adjusted to displacement, when the outer sleeve is moved along, the slit width narrows.
The number of several fins is 10~20.
The number of the swirl vane is 10~30, and swirl vane setting angle is 10~30 °.
The number of the first order fuel nozzle is 5~10.
The number of the second level fuel nozzle ports is 4~8.
The number of the third level fuel nozzle ports is 6~12.
The percent opening of the porous disc is 1~5%.
The setting angle of the housing forward end inwall blade is 10~30 °.
The fuel quantity that the first order fuel nozzle ports spray accounts for the 80~90% of total fuel quantity.
The fuel quantity that the second level fuel nozzle ports spray accounts for the 5~10% of total fuel quantity.
The fuel quantity that the third level fuel nozzle ports spray accounts for the 1~5% of total fuel quantity.
The technology of the present invention effect is as follows：The present invention is the low high-temperature flue gas of a kind of thermal efficiency height, flameholding, DS NOx Est
Big backflow low NO, can be while NOX generations be effectively reduced, surely using the big backflow of high-temperature flue gas and flue gas recirculation
Fixed to burn and burn completely, having burning, stability is good, efficiency high completely, the characteristics of discharge less, can be applicable to civilian and work
Industry stove field.
Compared with prior art, the big backflow low NO of high-temperature flue gas of the present invention by three-level fuel and passes through tune
Section outer sleeve controls burner nozzle flow velocity in the position of axial direction, so as to control recirculating zone and high temperature gases recirculating amount in stove,
Reach the purpose of combustion flame layering by air classification ratio simultaneously, effectively reduce the superposition of flame, reduce flame temperature
Degree, so as to reach the purpose of control DS NOx Est.
The big backflow low NO of high-temperature flue gas of the present invention can be in freeze profile into special backflow vortex structure：From interior annular space
The air-flow of flow channel outflow is being formed about two small backflows to whirlpool close to the center of burner nozzle, and this backflow whirlpool is not only
Play a part of stable burning, and smoke backflow reduces the temperature of recirculating zone to this recirculating zone interior energy, so as to reduce NOX lifes
Into；From the air-flow of outer shroud air flow channel outflow in freeze profile into big recirculating zone, caused smoke backflow is to this area in burner hearth
Domain, effectively reduce thermal NO X formation.The present invention can coordinate with flue gas recirculating technique, in higher flue gas recirculation
It can stablize under rate and burn, and it is complete to burn, and (Nm3, refers to so as to which NOX generations are reduced into 30mg/Nm3 at 0 degree Celsius 1
The gas volume of normal atmosphere pressure；N represents standard conditions Nominal Condition, i.e. the condition of air is：One standard
Atmospheric pressure, temperature are 0 DEG C, relative humidity 0%) below, reach the level of minimum discharge.
Brief description of the drawings
Fig. 1 is the structural representation for implementing a kind of big backflow low NO of high-temperature flue gas of the present invention.
Fig. 2 is the central unit construction schematic diagram in Fig. 1.
Reference lists as follows：1- air intake sections；2- burner shells；3- central cylinders front end；4- fins；5-
First order fuel nozzle；6- porous discs；7- housing forward end inwall blades；8- inner sleeves；9- outer sleeves；10- third level fuel sprays
Mouthful；11- second level fuel nozzle ports；12- swirl vanes, 13- central cylinders；14- outer shroud air flow channels；15- inner ring air streams
Road；16- annular air clefts；17- annular air cleft air flow channels；50- first order fuel nozzle ports；130- central cylinder air inlets.
Embodiment
Below in conjunction with the accompanying drawings (Fig. 1-Fig. 2) the present invention will be described.
Fig. 1 is the structural representation for implementing a kind of big backflow low NO of high-temperature flue gas of the present invention.Fig. 2 is in Fig. 1
Central unit construction schematic diagram.As shown in Figure 1 to Figure 2, the big backflow low NO of a kind of high-temperature flue gas, including burner shell
2, the rear end of the burner shell 2 has the connecting interface of connection air intake section 1, is provided with the burner shell 2
Central cylinder 13, the centre of central cylinder front end 3 are provided with third level fuel nozzle ports 10, set along the centre
Several fins 4 to radially distribute are equipped with, second level fuel nozzle ports 11 are distributed among several described fins 4, described
Swirl vane 12 and central cylinder air inlet 130 are disposed with from the front to the back on the rear portion outer peripheral face of central cylinder 13,
Inner sleeve 8 is provided with the front end outer peripheral face of the central cylinder 13, between the inner sleeve 8 and the central cylinder 13
Form inner ring air flow channel 15, the outside of the inner sleeve 8 is provided with outer sleeve 9, the outer sleeve 9 and the inner sleeve 8 it
Between form annular air cleft air flow channel 17, the front end of the annular air cleft air flow channel 17 is provided with porous disc 6, the annular gas
The annular air cleft 16 that the rear end of seam air flow channel 17 is formed between the outer sleeve 9 and the inner sleeve 8, the outer sleeve 9
Outer shroud air flow channel 14 is formed between the burner shell 2, first order fuel is provided with the outer shroud air flow channel 14
Jet pipe 5, the first order fuel nozzle ports 50 of the first order fuel nozzle 5 are towards the inwall of the burner shell 2.
The first order fuel nozzle ports 50 are located on the front end outer peripheral face of the first order fuel nozzle 5.The burner
Housing forward end inwall blade 7 (also known as small air blade) is provided with housing 2.The outer sleeve 9 and the inner sleeve 8 are loudspeaker
Shape；Or the outer sleeve is tubaeform, the inwall of the inner sleeve is straight barrel type and outer wall is taper；The annular air cleft
16 slit width is adjusted by the axial displacement between the outer sleeve 9 and the inner sleeve 8, when the outer sleeve 9 is moved along
When, the slit width narrows.The number of several fins 4 is 10~20.The number of the swirl vane 12 is 10~30
Individual, the setting angle of swirl vane 12 is 10~30 °.The number of the first order fuel nozzle 5 is 5~10.The second level
The number of fuel nozzle ports 11 is 4~8.The number of the third level fuel nozzle ports 10 is 6~12.The porous disc 6 is opened
Porosity is 1~5%.The setting angle of the housing forward end inwall blade 7 is 10~30 °.The first order fuel nozzle ports 50 are sprayed
The fuel quantity gone out accounts for the 80~90% of total fuel quantity.The fuel quantity that the second level fuel nozzle ports 11 spray accounts for the 5 of total fuel quantity
~10%.The fuel quantity that the third level fuel nozzle ports 10 spray accounts for the 1~5% of total fuel quantity.
Refering to Fig. 1-Fig. 2, combustion air (also known as fires from air intake section 1 into burner shell 2 in the present embodiment
Burner sleeve) in, have sub-fraction air-flow by central cylinder air inlet 130 be split enter central cylinder 13 in after from
The side of fin 4 outflow of central cylinder front end 3, most of airflow passes swirl vane 12, and eddy flow circumferential passages.Revolving
In the presence of flowing blade, air stream carries certain curl.Air stream is divided into three strands of air-flows, three strands of air-flows in burner front end
Flow separately through inner ring air flow channel 15, annular air cleft 16 (also known as annular enters air cleft) and outer shroud air flow channel 14.Outer shroud air
Big return-flow structure is formed in burner hearth middle and lower part, the environment of circulation in flue gas is formed, effectively reduces thermal NO X formation.It is interior
Annular space gas forms the small plot structure that flowed back to whirlpool, when burning is carried out, flue gas meeting caused by flame front before burner nozzle
It is back in this recirculating zone, forms the flue gas recirculation of inside, not only act as the purpose of stable burning, and also reduces NOx
Generation.The uninterrupted of three strands of described air-flows can be controlled by adjusting outer sleeve 9 in the position of axial direction.
Refering to Fig. 1, the side of fin 4 can form the weak eddy flow in center as air outlet, the air-flow of outflow, and this weak eddy flow is not
Only there is facilitation to fuel blending, and have certain effect to stablizing burning.The number of fin 4 10-20, the length of fin 4
About the 1/3 of the diameter of central cylinder front end 3.Number, length and the width of the fin 4 can enter according to natural fuel situation
Row adjustment.Refering to Fig. 2, the major function of the swirl vane 12 is to provide certain gas cyclone number, spinning disk number 10
~30.In the present embodiment, the number of swirl vane 12 is 16,30 ° of setting angle.The big I of the eddy flow of swirl vane 12
With by the number for adjusting swirl vane 12, swirl vane 1) setting angle optimize.Refering to Fig. 1, the porous disc 6 it is big
The small influence to overall flow field is very big, and the size of porous disc 6 influences the flow velocity of combustion-supporting air flow, so as to influence combustion stability
And combustion flame form.In the present embodiment, the size of porous disc 6 is adjusted to reach inner and outer rings air velocity
60m/s or so size range.
Fuel quantity point three-level ratio is allocated in the present embodiment, and wherein primary fuel jet pipe is located at burner cylinder
Periphery, primary fuel spout 50 are opened in the side wall of primary fuel jet pipe 5, and fuel strikes burning after the ejection of primary fuel spout 50
Body cylinder wall, as outer shroud air stream flows to burner hearth after having preliminary mix with outer shroud air stream.Secondary fuel spout 11 is opened
In the outer circumferential side region of central cylinder front end 3.Three-level fuel nozzle ports 10 are opened in the inner ring circumferential area in central cylinder front end 3.
Fuel with the side outlet of fin 4 flow after tentatively premixing after secondary fuel spout 11 and three-level fuel nozzle ports 10 spray
Enter burner hearth to be burnt.Number, fuel injection speed, the fuel nozzle ports shape of fuel nozzle can be adopted to control fuel and air
Incorporation time.The number of primary fuel jet pipe 5 is 5~10.In the present embodiment, jet pipe number is 5, nozzle configuration
To be square.The number of secondary fuel spout 11 4~8, in the present embodiment, spout number are 4, and nozzle configuration is circle
Shape.The number of three-level fuel nozzle ports 10 is 6~12, and in the present embodiment, spout number is 8, and nozzle configuration is circle.
It is hereby stated that described above contribute to skilled artisan understands that the invention, but not limit the present invention
The protection domain of creation.It is any that equivalent substitution described above, modification are improved without departing from the invention substantive content
And/or the implementation deleted numerous conform to the principle of simplicity and carried out, each fall within the protection domain of the invention.
Claims (10)
- A kind of 1. big backflow low NO of high-temperature flue gas, it is characterised in that including burner shell, the burner shell Rear end has the connecting interface of connection air intake section, and central cylinder, central cylinder are provided with the burner casing body The centre of front end is provided with third level fuel nozzle ports, and several ribs to radially distribute are provided with along the centre Piece, second level fuel nozzle ports are distributed among several described fins, by forward direction on the rear portion outer peripheral face of the central cylinder After be disposed with swirl vane and central cylinder air inlet, be provided with inner sleeve on the outer peripheral face of the central cylinder front end Cylinder, inner ring air flow channel is formed between the inner sleeve and the central cylinder, overcoat is provided with the outside of the inner sleeve Cylinder, forms annular air cleft air flow channel, the front end of the annular air cleft air flow channel between the outer sleeve and the inner sleeve It is provided with porous disc, the annular that the rear end of the annular air cleft air flow channel is formed between the outer sleeve and the inner sleeve Air cleft, outer shroud air flow channel is formed between the outer sleeve and the burner shell, is provided with the outer shroud air flow channel First order fuel nozzle, the first order fuel nozzle ports of the first order fuel nozzle are towards the inwall of the burner shell.
- A kind of 2. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order combustion Material spout is located on the front end outer peripheral face of the first order fuel nozzle.
- A kind of 3. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the burner casing It is provided with housing forward end inwall blade in vivo.
- A kind of 4. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the outer sleeve with The inner sleeve is tubaeform；Or the outer sleeve is tubaeform, the inwall of the inner sleeve is straight barrel type and outer wall is Taper；The slit width of the annular air cleft is adjusted by the axial displacement between the outer sleeve and the inner sleeve, when described outer When sleeve is moved along, the slit width narrows.
- A kind of 5. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that several described ribs The number of piece is 10~20.
- A kind of 6. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the swirl vane Number be 10~30, swirl vane setting angle be 10~30 °.
- A kind of 7. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order combustion The number for expecting jet pipe is 5~10, and the number of the second level fuel nozzle ports is 4~8, of the third level fuel nozzle ports Number is 6~12.
- 8. the big backflow low NO of a kind of high-temperature flue gas according to claim 1, it is characterised in that the porous disc Percent opening is 1~5%.
- A kind of 9. big backflow low NO of high-temperature flue gas according to claim 3, it is characterised in that the housing forward end The setting angle of inwall blade is 10~30 °.
- A kind of 10. big backflow low NO of high-temperature flue gas according to claim 1, it is characterised in that the first order The fuel quantity that fuel nozzle ports spray accounts for the 80~90% of total fuel quantity, and the fuel quantity that the second level fuel nozzle ports spray accounts for total combustion The 5~10% of doses, the fuel quantity that the third level fuel nozzle ports spray account for the 1~5% of total fuel quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720577503.4U CN206890519U (en) | 2017-05-23 | 2017-05-23 | A kind of big backflow low NO of high-temperature flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720577503.4U CN206890519U (en) | 2017-05-23 | 2017-05-23 | A kind of big backflow low NO of high-temperature flue gas |
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| Publication Number | Publication Date |
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| CN206890519U true CN206890519U (en) | 2018-01-16 |
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ID=61320430
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| CN201720577503.4U Active CN206890519U (en) | 2017-05-23 | 2017-05-23 | A kind of big backflow low NO of high-temperature flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062226A (en) * | 2017-05-23 | 2017-08-18 | 北京市热力集团有限责任公司 | A kind of big backflow low NO of high-temperature flue gas |
| WO2021027094A1 (en) * | 2019-08-14 | 2021-02-18 | 江苏中圣园科技股份有限公司 | Combustion apparatus for upper combustion chamber of sleeve kiln |
-
2017
- 2017-05-23 CN CN201720577503.4U patent/CN206890519U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062226A (en) * | 2017-05-23 | 2017-08-18 | 北京市热力集团有限责任公司 | A kind of big backflow low NO of high-temperature flue gas |
| CN107062226B (en) * | 2017-05-23 | 2023-10-17 | 北京市热力集团有限责任公司 | High-temperature flue gas large-backflow low-nitrogen combustor |
| WO2021027094A1 (en) * | 2019-08-14 | 2021-02-18 | 江苏中圣园科技股份有限公司 | Combustion apparatus for upper combustion chamber of sleeve kiln |
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