CN107461742A - It is classified nonflame low nitrogen burning head - Google Patents
It is classified nonflame low nitrogen burning head Download PDFInfo
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- CN107461742A CN107461742A CN201710673565.XA CN201710673565A CN107461742A CN 107461742 A CN107461742 A CN 107461742A CN 201710673565 A CN201710673565 A CN 201710673565A CN 107461742 A CN107461742 A CN 107461742A
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- Prior art keywords
- airduct
- gas pipe
- low nitrogen
- combustion
- nitrogen burning
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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
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
-
- 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
- F23D14/70—Baffles or like flow-disturbing devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/007—Mixing tubes, air supply regulation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Nonflame low nitrogen burning head is classified, belongs to industrial burner and boiler technology field.The present invention includes airduct, Gas Pipe, adpting flange, igniter and ion inductive needle；The Gas Pipe is arranged inside airduct, and both are connected by adpting flange；Igniter and ion inductive needle are additionally provided between the airduct, Gas Pipe.The present invention prepares the classification nonflame low nitrogen burning head of gained, NOx and CO discharges effectively can be reduced into below 10ppm during burning, while can keep the stability of burning.
Description
Technical field
The present invention relates to a kind of burner of low-nitrogen oxide discharging, and in particular to one kind classification nonflame low nitrogen burning
Head, belong to industrial burner and boiler technology field.
Background technology
According to the detection statistics analysis result of national gas industry boiler in 2014, wherein NOx emission mass concentration is less than
Equal to 200mg/m3Boiler only account for 35%, CSEI in 37 different models of China's sale to firing
Burner（Oily is dual-purpose）NOx emission detection find, NOx emission concentration of the burner under reasonable employment state be 54 ~
184mg/m3, average concentration is 116 mg/m3.Combustion of industrial boiler device above is more using traditional, forced air supply, diffusion type
Combustion system, the main purpose of the type burner is after-flame and safety, few to do corresponding measure to NOx emission.
Some improvement are carried out to combustion head, such as increase some gas nozzles vertical with air-flow direction, America and Europe one
The burner of a little countries can reach below 80mg/m3 NOx emission.
Now, for the environmental requirement of some regional below 30mg/m3 NOx emissions, occurred and adopted main
Technology path includes fractional combustion, premixed combustion, flue gas recirculation, porous media catalysis burning and flameless combustion：
（1）Fuel-staged combustion or Researched of Air Staging Combustion Burning Pulverized Coal：
Researched of Air Staging Combustion Burning Pulverized Coal（As shown in Figure 2）The first order is fuel-rich combustion, adds excess air in the second level, is fired for lean combustion
Burn, air cooling is added between two-stage to ensure that ignition temperature is unlikely to too high.Fuel-staged combustion（As shown in Figure 3）With air
Fractional combustion contrast, the first order are burnt for fuel dilute phase, and are added fuel in the second level and caused equivalent proportion to reach requirement
Numerical value.Both approaches will eventually make the excess air coefficient of whole system keep a definite value.The technological system is more complicated,
And also without the high-temperature area for eliminating flame.
（2）Lean fuel premixed combustion technology：
Premixed combustion refers to that fuel is thoroughly mixed with oxidant on molecular level before mixture is lighted, and its technological process is such as
Shown in Fig. 4.Generation for controlling NOx, it is that can be realized by the complete control of equivalent proportion to burning the advantages of this technology
The control of temperature, so as to reduce thermal NO x generating rates, in some cases, premixed combustion and partly-premixed burning are comparable
Non- premixed combustion reduces 85%-90% NOx generations.In addition, fully premixed can also be reduced because of excess air coefficient inhomogeneities
The caused reduction that control is generated to NOx.
If lean combustion premix adds woven wire combustion head again, surface combustion is formed, then flame is more scattered, and NOx emission enters one
Step reduces.
But premixed combustion technology still suffers from unsolved technological difficulties in security control：When premixed gas by
Tempering is may result in its high flammability；Second, too high excess air coefficient can cause the increase of flue gas loss, reduce
Boiler thermal output；Third, the fine dust adhesion that woven wire combustion head is easily melted, maintenance period are short.Lean combustion now
Premix burner power is usually no more than 2MW.
（3）Outside flue gas recirculation and inside smoke recirculating technique：The reduction of ignition temperature can be by flame zone
Domain adds flue gas to realize, the flue gas of addition absorbs heat so as to reduce ignition temperature.By the way that the combustion product of flue gas is added to
In combustion zone, ignition temperature is not only reduced, reduces NOx generations；The flue gas added simultaneously reduces the partial pressure of oxygen, this
The process of oxygen and nitrogen generation thermal NO x will be weakened, so as to reduce NOx generation.According to the difference of application principle, flue gas
Recycling has two kinds of application modes, is respectively that outside flue gas recirculation recycles with inside smoke.
For outside flue gas recirculating technique, flue gas, by an external pipe, rejoins from the outlet of boiler
Into burner hearth.Outside flue gas recirculation can reduce by 70% NOx generations.Outer circulation ratio also has larger shadow to NOx control effects
Ring, it is also more obvious with the increase NOx reduction amplitude of outer circulation ratio, but circulating fan power consumption also will increase.
Recycled for inside smoke, smoke backflow to combustion zone mainly passes through the aerodynamics of burner.It is internal
Flue gas recirculation mainly is produced to be rotated up to and followed by the Involving velocity or turbulent burner air-flow of high speed jet flames
Ring effect.Outside smoke circulating system（Fig. 5）Add a circulation cup in burner head, it is middle by high velocity air, due to
Pressure differential causes flue gas to rejoin into combustion zone.The inside smoke circulatory system（Fig. 6）Reached by high velocity air nozzle
Circulating effect.
By producing an annular recirculation regions in flame kernel, high-temperature gas will be returned to burner throat, and this is true
The igniting to cold unburned gas has been protected, while NOx generations are reduced by reducing flame temperature and reducing oxygen partial pressure.
Outer, the interior circulation of flue gas, there are larger size requirement, after the technology, the system of boiler to the burner hearth of burning
Cause originally to improve a lot.
（4）Porous media catalysis burning：
Another method for reducing flame temperature is exactly the external heat transfer of as fast as possible and more reinforcement flame.Increase in burner
Porous media is added（PIM）So that combustion reaction occurs in porous media, radiation so from burner to surrounding environment and
Heat convection is just reinforced.Experiment shows, is less than 1600K using the ignition temperature of PIM burners, NOx generation amount is in 5-
20ppm or so.
PIM burners can also add catalyst at burner inlet, and such fuel molecule and oxidizer molecule will
Reacted with one than relatively low activation energy in catalyst surface.So reaction temperature is lower compared to similar burning.
Because course of reaction is only carried out in catalyst surface, NOx will not be produced, the NOx generations of so catalysis burning can be down to 1ppm.
Catalysis burning the shortcomings that be exactly must assure that active surface one than relatively low temperature under it is not oxidized or evaporation,
And catalyst cost is of a relatively high, there is intoxicating phenomenon in catalyst prolonged application, therefore such burner is difficult to obtain and on a large scale should
With.
（5）Flameless combustion：
Traditional flame combustion is divided into premixed combustion and diffusion combustion, and its main feature includes：1. fuel and oxygen are at high temperature
Reaction, temperature is more high more contributes to the stabilization of flame；2. flame front face is visual（The flame of methyl hydride combustion is generally blueness, there is carbon
Cigarette is yellow when producing）；3. most of fuel complete burning in the very thin zone of flame, but combustion reaction can be in downstream not
Completed in visible region.
Generally, flame typically oneself serves as igniter after lighting, and incoming is lighted a fire.This just needs foot
High flame temperature is reached to reach minimum ignition energy, but high flame temperature can cause NOx generation increases.
Someone in-furnace temperature be 1000 DEG C, air preheat to 650 DEG C, air-flow velocity it is higher in the case of, realize combustion
Expect flameless combustion.Also the position between someone is evenly arranged using annular main combustion nozzle and the tubular return-flow structure of center arrangement
The shearing effect of relation and viscous fluid, form substantial amounts of backflow high-temperature flue gas and blended with fresh air, improve air
Temperature and air is diluted, the diluted high temperature air runs into fuel and spontaneous combustion occurs, and forms high degree of dispersion reaction
Area, so as to realize flameless combustion.For such flameless combustion, smoke backflow occurs before combustion, in some instances it may even be possible to is burning
It is central, the fuel and air of the flue gas so recycled premix, and ignition temperature is reduced, expand conversion zone.
Flameless combustion flame distribution is uniform, and ignition temperature is low, and it is less that this make it that NOx is produced.
Such flameless combustion generally requires device or the measure of special preheated air.
The content of the invention
It is an object of the present invention to overcome the above deficiencies, there is provided one kind classification nonflame low nitrogen burning head, solves combustion gas
The problem of burning NOx discharge is higher, and also to ensure under underload, low excess air factor, NOx emission also meets low
Emission request.
According to technical scheme provided by the invention, be classified nonflame low nitrogen burning head, including airduct, Gas Pipe, adpting flange,
Igniter and ion inductive needle；The Gas Pipe is arranged inside airduct, and both are connected by adpting flange；The airduct,
Igniter and ion inductive needle are additionally provided between Gas Pipe.
The airduct includes outer airduct and interior airduct, and interior airduct side is provided with baffle plate；Between the outer airduct and interior airduct
For hollow formation air duct.
After the Gas Pipe passes through adpting flange and baffle plate, it is placed in interior airduct.
The Gas Pipe is welded on baffle plate.
The igniter is located above Gas Pipe, is fixed between adpting flange and baffle plate；The ion inductive needle position
Below Gas Pipe, it is fixed between adpting flange and baffle plate.
The igniter is high-voltage pulses device.
The interior airduct is provided with several air jet holes；The Gas Pipe is provided with several gas injection discharge orifices.
Air jet hole aperture is 10mm-40mm, and gas injection orifice aperture is 1mm-4mm；The air jet hole
With the aperture of gas injection discharge orifice staged adjustment is carried out as desired for excess air factor.
Be the air with certain pressure during operation, between inside and outside airduct, the air of certain pressure can through air jet hole to
Central-injection air；It is Gas Pipe at the center of burner, some gas injection discharge orifices is set in Gas Pipe.During operation, combustion gas
The combustion gas with certain pressure sprays through gas injection discharge orifice in pipe.
Before operation, first start air duct air feed, then igniter connects high-voltage pulse electric, and ignitor tip inspires electricity
Spark, then Gas Pipe connection combustion gas, the combustion gas that gas injection discharge orifice jet flow goes out is by spark ignition.During normal operation, injection
The first volume at a high speed of combustion gas inhales the flue gas of surrounding, and the combustion gas after dilution is transported in opposite directions with the high-speed air for equally rolling up the injection for having inhaled flue gas
Move, be sufficiently mixed and burn.After normal operation, after ion inductive needle senses gas current, igniter will be closed.
Because volume has inhaled flue gas, gas concentration is diluted for the combustion gas sprayed at a high speed.The air sprayed at a high speed has inhaled cigarette because of volume
Gas, oxygen concentration are diluted.In low burn gas concentration and the atmosphere of low oxygen concentration, combustion reaction is slack-off.The internal layer of air duct because
It is heated to form the condition of high temperature, the air in air duct is tentatively preheated.The air of ejection is able into one because volume inhales high-temperature flue gas
Walk heat temperature raising.The air smoke mixture of high temperature, the air-flow of high speed and slower combustion reaction, the combustion of disperse formula nonflame can be formed
Burn, burn seedless heart district and high-temperature region, heating power type and prompt NO generation are reduced.
In addition, jet flow bore dia that can be different by being designed to different zones, realizes air feed and combustion gas in different zones not
With proportioning, so as to form fractional combustion.
Excess air factor is less than 1 (generally 0.7 to 0.9）Region burning reduced because of anoxycausis burning temperature
Degree, reduces the generation of heating power type and prompt NO.Meanwhile it can also be generated also because of imperfect combustion in the region
The nitrogen oxides generated by burning can be reduced into nitrogen and carbon dioxide by originality atmospheric CO, carbon monoxide, from
And reduce the discharge of nitrogen oxides.Simultaneously so that the excess air factor in some regions is small by excess air factor more than 1.2
Completely burned is able in the imperfect combustion fuel gas in 1 region again air distribution combustion, combustion gas.Further reduce nitrogen oxygen
The discharge of compound.
Beneficial effects of the present invention：The present invention prepares the classification nonflame low nitrogen burning head of gained, can be effectively during burning
NOx and CO discharges are reduced to below 10ppm, while the stability of burning can be kept.And with other low NOx combustion skills
Art, which is compared, has lot of advantages：Compared with general fractional combustion, without obvious flame accumulation regions, uniformity of temperature profile, CO discharges
It is low；Compared with lean fuel premixed combustion, tempering or thermal acoustic oscillation phenomenon will not be caused, there is good flame holding；With it is dilute
Release diffusion combustion (flue gas recirculation）Compare, it is not necessary to increase extra equipment, it is not necessary to increase size of burner hearth, will not also increase
The complexity of system, or the problem of generation rough burning and efficiency of combustion decline；Compared with catalytic combustion technology, cost will
It is more cheap；Compared with other flameless combustion technologies, there is the characteristics of fractional combustion, NOx emission is lower, and flameless combustion is steady
It is broader to determine section.
Brief description of the drawings
Fig. 1 is structure sectional view of the present invention.
Fig. 2 is Researched of Air Staging Combustion Burning Pulverized Coal schematic diagram.
Fig. 3 is fuel-staged combustion schematic diagram.
Fig. 4 is the process chart of premix combustion systems.
Fig. 5 is outside smoke circulating system（Recycling cover）Schematic diagram.
Fig. 6 is the inside smoke circulatory system（Jet entrainment）Schematic diagram.
Description of reference numerals：1st, airduct；1-1, outer airduct；1-2, interior airduct；1-3, baffle plate；2nd, Gas Pipe；3rd, connection method
It is blue；4th, igniter；5th, ion inductive needle；6th, air jet hole；7th, gas injection discharge orifice.
Embodiment
As shown in Figure 1：It is classified nonflame low nitrogen burning head, including airduct 1, Gas Pipe 2, adpting flange 3, the and of igniter 4
Ion inductive needle 5；The Gas Pipe 2 is arranged inside airduct 1, and both are connected by adpting flange 3；The airduct 1, Gas Pipe
Igniter 4 and ion inductive needle 5 are additionally provided between 2.
The airduct 1 includes outer airduct 1-1 and interior airduct 1-2, and interior airduct 1-2 sides are provided with baffle plate 1-3；The outer airduct
It is hollow formation air duct between 1-1 and interior airduct 1-2.
After the Gas Pipe 2 passes through adpting flange 3 and baffle plate 1-3, it is placed in interior airduct 1-2, passes through gas injection discharge orifice 7
Combustion gas is discharged in inside airduct 1-2.
The Gas Pipe 2 is welded on baffle plate 1-3.
The igniter 4 is located at the top of Gas Pipe 2, is fixed between adpting flange 3 and baffle plate 1-3；The ion sense
Answer pin 5 to be located at the lower section of Gas Pipe 2, be fixed between adpting flange 3 and baffle plate 1-3.
The igniter 4 is high-voltage pulses device.
The interior airduct 1-2 is provided with several air jet holes 6；The Gas Pipe 2 is provided with several gaseous jets
Hole 7.
The aperture of air jet hole 6 is 10mm-40mm, and the aperture of gas injection discharge orifice 7 is 1mm-4mm；The air jet
Hole 6 and the aperture of gas injection discharge orifice 7 carry out staged adjustment as desired for excess air factor.
Both are at hierarchical approaches：At adpting flange 3, the air jet bore dia of some rows is relatively small, corresponding
Excess air factor is less than 1（Generally 0.7-0.9）, and the air jet bore dia away from some rows at adpting flange 3 compared with
Greatly, corresponding excess air factor is more than 1.2.
For those of ordinary skill in the art, it can also make on the basis of the above description other
Various forms of changes or variation, can not be exhaustive here.What every technical scheme for belonging to patent of the present invention was extended out
Row of the obvious changes or variations still in the protection domain of patent of invention.
Claims (8)
1. nonflame low nitrogen burning head is classified, it is characterized in that：Including airduct（1）, Gas Pipe（2）, adpting flange（3）, igniter
（4）With ion inductive needle（5）；The Gas Pipe（2）It is arranged at airduct（1）Inside, both pass through adpting flange（3）Connection；Institute
State airduct（1）, Gas Pipe（2）Between be additionally provided with igniter（4）With ion inductive needle（5）.
2. classification nonflame low nitrogen burning head as claimed in claim 1, it is characterized in that：The airduct（1）Including outer airduct（1-1）With
Interior airduct（1-2）, interior airduct（1-2）Side is provided with baffle plate（1-3）；The outer airduct（1-1）With interior airduct（1-2）Between be
Sky forms air duct.
3. classification nonflame low nitrogen burning head as claimed in claim 1 or 2, it is characterized in that：The Gas Pipe（2）Through adpting flange
（3）And baffle plate（1-3）Afterwards, it is placed in interior airduct（1-2）In.
4. classification nonflame low nitrogen burning head as claimed in claim 3, it is characterized in that：The Gas Pipe（2）It is welded on baffle plate（1-3）
On.
5. classification nonflame low nitrogen burning head as claimed in claim 1 or 2, it is characterized in that：The igniter（4）Positioned at Gas Pipe
（2）Top, it is fixed on adpting flange（3）And baffle plate（1-3）Between；The ion inductive needle（5）Positioned at Gas Pipe（2）Lower section,
It is fixed on adpting flange（3）And baffle plate（1-3）Between.
6. classification nonflame low nitrogen burning head as claimed in claim 5, it is characterized in that：The igniter（4）For high-voltage pulse point
Firearm.
7. classification nonflame low nitrogen burning head as claimed in claim 1 or 2, it is characterized in that：The interior airduct（1-2）It is provided with some
Individual air jet hole（6）；The Gas Pipe（2）It is provided with several gas injection discharge orifices（7）.
8. classification nonflame low nitrogen burning head as claimed in claim 7, it is characterized in that：The air jet hole（6）Aperture is 10mm-
40mm, gas injection discharge orifice（7）Aperture is 1mm-4mm；The air jet hole（6）With gas injection discharge orifice（7）Aperture according to need
To be directed to excess air factor and carry out staged adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673565.XA CN107461742B (en) | 2017-08-09 | 2017-08-09 | Graded flameless low-nitrogen combustion head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673565.XA CN107461742B (en) | 2017-08-09 | 2017-08-09 | Graded flameless low-nitrogen combustion head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107461742A true CN107461742A (en) | 2017-12-12 |
| CN107461742B CN107461742B (en) | 2020-04-28 |
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ID=60548662
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710673565.XA Active CN107461742B (en) | 2017-08-09 | 2017-08-09 | Graded flameless low-nitrogen combustion head |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109764333A (en) * | 2019-02-12 | 2019-05-17 | 扬州斯大锅炉有限公司 | The super low NO of internal combustion drum type brake |
| CN109899786A (en) * | 2019-03-27 | 2019-06-18 | 苏州博墨热能产品有限公司 | Nonflame low NO and nonflame low nitrogen burning method |
| CN117515549A (en) * | 2023-10-13 | 2024-02-06 | 江苏中圣园科技股份有限公司 | Staged combustion surface burner |
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| CN201289084Y (en) * | 2008-09-03 | 2009-08-12 | 李湘庭 | High altitude ignition co-burning machine |
| JP5475374B2 (en) * | 2009-09-11 | 2014-04-16 | 東邦瓦斯株式会社 | Surface burning burner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109764333A (en) * | 2019-02-12 | 2019-05-17 | 扬州斯大锅炉有限公司 | The super low NO of internal combustion drum type brake |
| CN109899786A (en) * | 2019-03-27 | 2019-06-18 | 苏州博墨热能产品有限公司 | Nonflame low NO and nonflame low nitrogen burning method |
| CN109899786B (en) * | 2019-03-27 | 2020-06-02 | 苏州博墨热能产品有限公司 | Flameless low-nitrogen combustor and flameless low-nitrogen combustion method |
| CN117515549A (en) * | 2023-10-13 | 2024-02-06 | 江苏中圣园科技股份有限公司 | Staged combustion surface burner |
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| Publication number | Publication date |
|---|---|
| CN107461742B (en) | 2020-04-28 |
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