CN207702461U - The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined - Google Patents
The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined Download PDFInfo
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- CN207702461U CN207702461U CN201721441246.8U CN201721441246U CN207702461U CN 207702461 U CN207702461 U CN 207702461U CN 201721441246 U CN201721441246 U CN 201721441246U CN 207702461 U CN207702461 U CN 207702461U
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Abstract
The utility model is related to the novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined,It include burner housing,Air duct,Blast tube,Spray head,Flue gas/air Mixture inducer,Premix mixer,Non- pre- mixed gas inlet and pre- mixed fuel gas inlet,Injection head is non-mixed,It is interior to be equipped with conventional low nitrogen technology basic configuration,Combustion gas is divided into non-pre- mixed and pre- mixed two kinds,Premix combustion gas is contained in mixing composition in premix mixer using elder generation,The synthesis gaseous mixture of combustion air and circulating flue gas,It is sent to injection head through air duct,Non- pre- mixed combustion gas is sent by blast tube to injection head,Comprehensive gaseous mixture is respectively fed to burner hearth with non-pre- mixed combustion gas by injection head,Non- premixed combustion on the basis of execution based on full premix combustion pattern in burner hearth,Two kinds of combustion modes are organically combined,The novel burner constructed has concentrated the advantages of two kinds of combustion systems,And breach the power limit of premix burner,Improve work applicable surface,There is very strong practicability.
Description
Technical field
It is especially a kind of using high heating value combustion gas as fuel the utility model is related to gas fired-boiler heater element technical field
The novel super-low nitrogen combustion apparatus that non-premixed combustion and premixed combustion are combined.
Background technology
NOx is a kind of important atmosphere pollution, is one of the arch-criminal for causing acid rain, haze.As China controls environmental protection
The increasing of reason dynamics and going deep into for energy-saving and emission-reduction policy, it is also increasingly stringent for the limitation of industrial combustion gas emission of NOx of boiler amount,
Put into effect a series of restriction boiler pollutant emission limits, monitoring and monitoring requirement standard, Beijing in 2017
Area must be decreased to 30mg/Nm about newly-built gas fired-boiler NOx emission3It is exactly an example below.For this purpose, industry is just in boiler flue gas
It carries out largely exploring and innovating in terms of the low-NO_x combustion technology of burner.
There are mainly two types of the current simultaneously drop nitrogen type gas burners of more application that wins initial success：
One is the diffusion combustion formula burner more early released, also known as " non-premix burner ", its main feature is that by combustion-supporting sky
Gas and combustion gas are respectively fed to burner hearth in the case of unmixed in burner, since combustion air and combustion gas be not in burner
Portion mixes, so needing the low nitrogen burnings ancillary technique such as adapted flue gas recirculation to be dropped when this non-premix burner work
Nitrogen, it is flameholding, safe and easy to adjust although having many advantages, such as that itself is simple in structure, easily manufactured, due to necessary
The low nitrogen burnings ancillary technique such as adapted flue gas recirculation can just be effectively reduced the discharge capacity of boiler NOx simultaneously, not only increase
Setup cost, and also result in the unstability for bringing and increasing and burning；
The second is the full premixed type surface combustion burner researched and developed in recent years, also known as " all-premixing burner ", feature
It is that will be mixed into homogeneous mixture comprehensively in combustion air and the first metallic cylinder before burner throat of combustion gas, then make uniformly
Gaseous mixture only carries out abundant and efficient burning on metallic cylinder surface, rather than in round metal cylinder roasting, and due to the combustion heat
Amount is uniform, is not in extreme high heat in combustion chamber, thus the more non-premix burner of NOx discharge will lack, and can not use flue gas
The low nitrogen burnings ancillary techniques such as recycling.Disadvantage is that work applicable surface is not wide, existing all-premixing burner is only suitable
It is less for combustion gas and combustion air requirement, contribute less than 4t/h boiler, can just achieve effective control mixability and
Safe operation is ensured, for the boiler contributed more than 4t/h, since the requirement of combustion gas and combustion air is big, combustion air and combustion
Gas is easy to cause detonation just in case when mixing uneven or generation blocking metal mesh situation in the metal mesh for premixing section head,
Thus cause the accident rate of high-power all-premixing burner higher, there are security risks.In addition, existing all-premixing burner fortune
It is stringenter to air distribution requirement when row, it is easy to happen tempering detonation when the oxygen content in the homogeneous mixture is less than 6%,
De- fire is easy to happen when higher than 9%, and when longtime running is under elevated oxygen level homogeneous mixture state, wherein excessive combustion-supporting
Air can take away generated heat when burning, cause to generate boiler heat loss, reduce the thermal efficiency.So being applicable in from work
Property, working condition controllability, safety in operation and stability angle consider, owe ideal, thus apply currently on the market more
Be still the diffusion combustion formula burner more first to come out, i.e., non-premix burner.
Therefore super low-NO_x combustion technology only exists in the innovation stage constantly explored at present, technology is not also overripened, imitates
Fruit also owes ideal.And gas fired-boiler realize NOx it is ultralow it is nitrogen discharged be the objective situation demand faced at present, and the realization of the demand
It must also start with from the initial ejection for reducing low NO NOx, replacement formula innovative design is updated to burner structure, is allowed to
The initial ejection amount that reduction NOx can be ensured from the combination of theory and practice is met conscientiously using the boiler of this burner
Increasingly harsh environmental requirement.
Invention content
The purpose of this utility model is to be burnt the shortcomings that overcoming existing low NO from existing high power gas is changed
The traditional combustion mode of device is started with, and is provided a kind of can take into account and is reached safe and stable equipment operation and ultralow nitrogen discharged dual-purpose
The novel super-low nitrogen combustion apparatus that non-premixed combustion and premixed combustion are combined.
The novel super-low nitrogen combustion apparatus that the non-premixed combustion and premixed combustion of the utility model are combined, main body include
Burner housing, air duct, blast tube and injection head, it is characterised in that：Non- pre- mixed combustion is divided into combustion gas used
Two kinds of gas and pre- mixed combustion gas also include to be provided with flue gas/air Mixture inducer, premix in novel super-low nitrogen combustion apparatus
Mixer, non-pre- mixed gas inlet and pre- mixed fuel gas inlet, wherein：
The front end of the flue gas/air Mixture inducer be mutually connected with the tail end of the premix mixer and with
Premix mixer, air duct and injection head are coaxially set gradually by airflow direction；
The blast tube main body is arranged in air duct, is made of air inlet port, air outlet and intermediate conduit,
The fixation of its air inlet port, which is stretched, sets on the wall body outer surface of air duct, fills the post of the non-pre- mixed gas inlet, goes out
Gas port is located on the tail end shaft core position of the injection head；
The flue gas/air Mixture inducer has flue gas recycled and combustion air by evenly mixing
Gaseous mixture transfers to the function of premix mixer；
Be fixedly installed the pre- mixed gas inlet in the cavity wall of the premix mixer, tail end with it is described
The front end of flue gas/air Mixture inducer be mutually connected, front end is mutually connected with the tail end of the air duct, has and connects
Receive gaseous mixture from the flue gas/air Mixture inducer with it is pre- mixed from the pre- mixed gas inlet
The two is simultaneously sufficiently mixed the synthesis gaseous mixture containing premix combustion gas, circulating flue gas and combustion air component in composition by combustion gas,
The synthesis gaseous mixture is transferred to by air duct 2 function in injection head again；
The injection head is non-premixed type, and inside includes to be provided with based on fuel staging, gas classification, bias combustion
Combustion gas spout, air supply channel, air gun and the steady flame device for the conventional low NO that equal low-NO_x combustion technologies mechanism is laid, have
It executes the non-pre- mixed combustion gas from the blast tube and the synthesis gaseous mixture from premix mixer respectively with fuel
The conventional spray pattern that classification, gas classification, bias combustion are laid out is sent into the function of burner hearth；
When work, the pre- mixed combustion gas being sent by pre- mixed fuel gas inlet enters after premix mixer and comes from cigarette
The gaseous mixture of gas/air Mixture inducer is sufficiently mixed, constitute in contain premix combustion gas, combustion air and cycle
The synthesis gaseous mixture of flue gas composition, and enter in injection head through the air duct, comprehensive gaseous mixture is straight through air supply channel
It picks in burner hearth and burns, execute premixed type combustion mode；Described being sent by non-pre- mixed gas inlet is non-pre- mixed
Directly by the interior combustion gas spout set or spray gun, stove is spurted into classification on demand after combustion gas is sent to by blast tube in injection head
Thorax, later again with by air supply channel be sent directly into it is comprehensive mix that gas phase is mixed to burn, synthesis gaseous mixture at this time has been filled the post of non-pre-
The role of combustion air in mixed burner, execution is non-premixed combustion operating mode, but based on the combustion air by
The synthesis gaseous mixture substitution of premixed type combustion mode is executed, thus the burner to construct has had non-premixed combustion and premix
Burn the working features that are combined, the advantages of with full mixing burner and unmixed combustion device；In addition, by air gun output
When the non-pre- mixed combustion gas in part executes ignition operation, igniting combustion supporting air is comprehensive gaseous mixture, since circulating flue gas is to comprehensive
Close the mixing combustion gas in gaseous mixture, combustion air has a diluting effect, thus the oxygen content in comprehensive gaseous mixture it is overall compared with
It is low, igniting point can be made to slightly have retardation, will not closely be ignited before steady flame device, the stabilization for ensuring root flame is contributed to,
Stable flame root can also be located at steady flame device downstream, avoid the generation that backfire detonation phenomenon occurs, be conducive to operational safety,
And circulating flue gas can take away generated partial heat when ignition immediately, can ensure that Wen Sheng at spraying machine head surface aditus laryngis
Will not be too high, it is advantageously ensured that the functional reliability and service life of burner apparatus, the security and stability of operation and environmental protection save
Energy.
The novel super-low nitrogen burning dress that the non-premixed combustion of the utility model and premixed combustion based on above-mentioned design are combined
It sets, due to non-pre- mixed combustion gas being divided into combustion gas and pre- mixed combustion gas two parts use, uses and first by combustion air and follow
The mixing of ring flue gas constitutes gaseous mixture, is then again further sufficiently mixed pre- mixed combustion gas in composition therewith in premix mixer
Synthesis gaseous mixture containing pre- mixed combustion gas, combustion air and circulating flue gas, then be sent into burner hearth through non-premixed type injection head,
In stove chamber inner combustion, the operating mode for being comparable to all-premixing burner of execution rather than pre- mixed combustion gas are sent through blast tube
Enter to after spraying in head classification feeding burner hearth on demand, then in burner hearth and with the operating mode work(for executing all-premixing burner
The synthesis gaseous mixture of energy is sufficiently mixed and burns, so being the equal of having combined into all-premixing burner operating mode function
Non- premix burner.Compared with existing non-premix burner, hence it is evident that the mixing of combustion gas and combustion air in burner hearth can be made
Evenly, it burns more abundant, can effectively avoid the generation of local high temperature zone, to greatly reduce the generation of thermal NO x, into
And reach the ultralow nitrogen discharged positive technique effects of boiler NOx.Compared with existing all-premixing burner, as a result of pre-
Being sufficiently mixed combustion gas, combustion air and circulating flue gas in dark clutch in advance becomes the mode of comprehensive gaseous mixture, makes injection head
As non-mixed, thus there is no the mixing sections for being possible to initiation safety accident in injection head, therefore can prevent existing skill
Cause detonation situation in mixing section due to combustion gas and combustion air mixing unevenness or obstruction metal mesh in art, also makes injection head
Work from the dosage of combustion gas and combustion air influence, so that the burner of the utility model is effectively breached power limit, expand
Big work applicable surface, can meet the requirement of various power requirements boilers.Therefore the utility model changes tradition
Combustion gas and the conventional thought that is mixed at burner nozzle and in burner hearth of combustion air, carried out burner safe combustion mode
It is innovated with functional structure, realizes the combination of non-premixed combustion and premixed combustion, non-premixed combustion and premix has been concentrated to fire
The advantages of burning, and breach the power limit of premix burner, has reached equipment combustion completion stable operation and ultralow nitrogen discharged
Dual purpose, be the renewal product of existing boiler-burner, have very strong practicability and vast market prospect.
Description of the drawings
Fig. 1 is the basic structure schematic diagram of the utility model embodiment.
In figure：
1. 2. air duct of burner housing, 3. blast tube, 31. air inlet port
32. 33. intermediate conduit 4. of air outlet sprays 5. flue gases of head/air Mixture inducer
6. premixing the non-pre- pre- mixed fuel gas inlet of mixed gas inlet 8. of mixer 7..
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.
In Fig. 1, the novel super-low nitrogen combustion apparatus that the non-premixed combustion and premixed combustion of the utility model are combined, it is main
Body includes burner housing 1, air duct 2, blast tube 3 and injection head 4, it is characterised in that：Combustion gas used is distinguished
Also include to be provided with flue gas/air mixing for two kinds of non-pre- mixed combustion gas and pre- mixed combustion gas, in novel super-low nitrogen combustion apparatus
Gas inducer 5, premix mixer 6, non-pre- mixed gas inlet 7 and pre- mixed fuel gas inlet 8, wherein：
The front end of the flue gas/air Mixture inducer 5 is mutually connected, simultaneously with the tail end of the premix mixer 6
It is coaxially set gradually by airflow direction with premix mixer 6, air duct 2 and injection head 4；
3 main body of blast tube is arranged in air duct 2, by air inlet port 31, air outlet 32 and intermediate tube
Road 33 is constituted, and the fixation of air inlet port 31, which is stretched, sets on the wall body outer surface of air duct 2, fills the post of the non-pre- mixed combustion gas
Air inlet 7, air outlet 32 are located in the injection head 4；
The flue gas/air Mixture inducer 5 has flue gas recycled and combustion air by evenly mixing
Gaseous mixture transfer to premix mixer function；
The pre- mixed gas inlet 8, tail end and institute are fixedly installed in the cavity wall of the premix mixer 6
The front end of the flue gas stated/air Mixture inducer 4 is mutually connected, and front end is mutually connected with the tail end of the air duct 2, tool
Have receive gaseous mixture from the flue gas/air Mixture inducer 5 with from the pre- mixed gas inlet 8
The two is simultaneously sufficiently mixed the synthesis containing premix combustion gas, circulating flue gas and combustion air component in composition by pre- mixed combustion gas
Gaseous mixture, then the synthesis gaseous mixture is transferred to by the function of spraying in head 4 by air duct 2；
The injection head 4 is non-premixed type, and inside includes to be provided with based on fuel staging, gas classification, deep or light combustion
Combustion gas spout, air supply channel, air gun and the steady flame device for the conventional low NO that the low-NO_x combustion technologies mechanism such as burning are laid, tool
Have execute by from the blast tube 3 non-pre- mixed combustion gas and from premix mixer 6 synthesis gaseous mixture respectively with
The conventional spray pattern that fuel staging, gas classification, bias combustion are laid out is sent into the function of burner hearth；
When work, it is described by the pre- mixed combustion gas that pre- mixed fuel gas inlet 8 is sent into enter premix mixer 6 after with come from
The gaseous mixture of flue gas/air Mixture inducer 4 is sufficiently mixed, constitute in containing premix combustion gas, combustion air and
The synthesis gaseous mixture of circulating flue gas component, and enter in injection head 4 through the air duct 2, comprehensive gaseous mixture is through gas supply
Channel, which is sent directly into burner hearth, burns, and executes premixed type combustion mode；Described being sent by non-pre- mixed gas inlet 7 is non-
Pre- mixed combustion gas is directly classified by the interior combustion gas spout set or spray gun on demand after being sent in injection head 4 by blast tube 3
Burner hearth is spurted into, mixes burning with the comprehensive gas phase that mixes being sent directly by air supply channel again later, synthesis gaseous mixture at this time fills
The role of combustion air in non-premix burner is appointed, execution is non-premixed combustion operating mode, but based on described combustion-supporting
Air is replaced by the synthesis gaseous mixture of execution premixed type combustion mode, thus there is the burner to construct non-premix to fire
It burns and the working features that are combined of premixed combustion, the advantages of with full mixing burner and unmixed combustion device；In addition, by gas
When the non-pre- mixed combustion gas in part of rifle output executes ignition operation, igniting combustion supporting air is comprehensive gaseous mixture, due to cycle
Flue gas has diluting effect to the mixing combustion gas in comprehensive gaseous mixture, combustion air, thus oxygen-containing in comprehensive gaseous mixture
Amount is overall relatively low, and igniting point can be made to slightly have retardation, will not closely be ignited before steady flame device, help to ensure root flame
Stabilization, stable flame root also can be located at steady flame device downstream, avoid occur backfire detonation phenomenon generation, be conducive to transport
Row safety, and circulating flue gas can take away generated partial heat when ignition immediately, can ensure that injection 4 surface larynx of head
Temperature liter will not be too high at mouthful, it is advantageously ensured that the functional reliability and service life of burner apparatus, the security and stability of operation
And environmental protection and energy saving.
Claims (1)
1. the novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined, main body include burner housing
（1）, air duct（2）, blast tube（3）With injection head（4）, it is characterised in that：Combustion gas used is divided into non-pre- mixed
Two kinds of combustion gas and pre- mixed combustion gas also include to be provided with flue gas/air Mixture inducer in novel super-low nitrogen combustion apparatus
（5）, premix mixer（6）, non-pre- mixed gas inlet（7）With pre- mixed fuel gas inlet（8）, wherein：
The flue gas/air Mixture inducer（5）Front end and the premix mixer（6）Tail end be mutually connected, simultaneously
With premix mixer（6）, air duct（2）With injection head（4）It is coaxially set gradually by airflow direction；
The blast tube（3）Main body is arranged in air duct（2）It is interior, by air inlet port（31）, air outlet（32）With in
Between pipeline（33）It constitutes, air inlet port（31）Fixed stretch is set in air duct（2）Wall body outer surface on, fill the post of described non-
Pre- mixed gas inlet（7）, air outlet（32）Positioned at the injection head（4）It is interior；
The premix mixer（6）Cavity wall on be fixedly installed the pre- mixed fuel gas inlet（8）, tail end with it is described
Flue gas/air Mixture inducer（5）Front end be mutually connected, front end and the air duct（2）Tail end be mutually connected；
The injection head（4）For non-premixed type, inside includes the combustion gas spout for being provided with conventional low NO, supplies and lead to
Road, air gun and steady flame device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721441246.8U CN207702461U (en) | 2017-11-02 | 2017-11-02 | The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721441246.8U CN207702461U (en) | 2017-11-02 | 2017-11-02 | The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined |
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| CN207702461U true CN207702461U (en) | 2018-08-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620961A (en) * | 2017-11-02 | 2018-01-23 | 上海华之邦科技股份有限公司 | The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined |
| CN113357671A (en) * | 2020-03-05 | 2021-09-07 | 杭州汽轮动力集团有限公司 | Gas turbine combustor capable of performing dual-mode conversion of diffusion and premixed combustion |
-
2017
- 2017-11-02 CN CN201721441246.8U patent/CN207702461U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620961A (en) * | 2017-11-02 | 2018-01-23 | 上海华之邦科技股份有限公司 | The novel super-low nitrogen combustion apparatus that a kind of non-premixed combustion and premixed combustion are combined |
| CN113357671A (en) * | 2020-03-05 | 2021-09-07 | 杭州汽轮动力集团有限公司 | Gas turbine combustor capable of performing dual-mode conversion of diffusion and premixed combustion |
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