CN206469254U - The light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow - Google Patents
The light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow Download PDFInfo
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- CN206469254U CN206469254U CN201720141799.5U CN201720141799U CN206469254U CN 206469254 U CN206469254 U CN 206469254U CN 201720141799 U CN201720141799 U CN 201720141799U CN 206469254 U CN206469254 U CN 206469254U
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Abstract
The utility model is related to a kind of light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow.Its furnace wall corner is respectively equipped with air inlet, it is characterized in that, the air inlet includes central air hose, once airduct and wind differential mechanism are arranged concentrically successively from inside to outside in the periphery of the central air hose, the primary air piping is divided into high speed wind inlet and low speed wind inlet, the high speed winds import sidepiece is provided with secondary air channel, and the secondary air channel air channel is consistent with high speed wind inlet air channel.Burner hearth is centrally formed four well mixed combustion centre of relative distribution, reduces area of localized hyperthermia；Because primary air jet ignites decreased effectiveness, main burning occurs at the higher burner hearth center of flow velocity axially upwards, therefore residence time of the flue gas in high-temperature region relative shortens.At utmost meet the growing amount of NOx in control combustion process.
Description
Technical field
The utility model is related to fume treatment environmental technology field, and in particular to a kind of light dense two-way steady combustion of differential heat backflow
Low nitrogen oxide burner.
Background technology
The pollutant acid gas of coal-fired plant boiler discharge is mainly including SOx, NOx and CO2 etc..With the economic skill of China
The raising of development and the environmental requirement of art, has strict control, not only with significant ring to the NOx emission of coal-fired power station boiler
Border benefit, and be one of environmental problem urgently to be resolved hurrily at present with great economic benefit and social benefit.
Consider from technology and economic angle, low NOx combusting technology is always most widely used control coal-fired boiler NOx
Emission measure, even has to using denitrating flue gas skill after investment and the huge burning of operating cost to meet discharge standard
Art, still must reduce the NOx concentration of smoke eliminator entrance using low NOx combusting technology, so as to reach saving operating cost
Purpose.
Existing low NOx combusting technology mainly includes：Low excess air combustion technology, air staged combustion technology, fuel
Grading combustion technology, flue gas recirculating technique, low-NOx combustor technology etc..In above-mentioned low-NO_x combustion technology, fuel fires again
The effect for reducing NOx is obvious, then the reburning fuel during firing can be gas (natural gas, coal gas), liquid (water coal
Slurry, oil) or the various fuel such as solid (coal dust, biomass fuel).In conditional place, different fuel conduct can be used
Reburning fuel, so as to which operation and the improvement expenses of reburning technology is greatly lowered.But set on boiler and fire spout again,
Many relevant devices are undoubtedly added, operating cost is consequently increased.
Flue gas recirculation, mainly extracts partial fume from air preheater, leads to after being sent directly into burner hearth or being mixed with a Secondary Air
Cross burner and enter burner hearth, reduce burner hearth oxygen concentration, reduce fire box temperature, so as to reduce NOx discharge and effectively prevent knot
Slag, but the cycling rate of flue gas recirculation is larger to the stability influence of burning, adjusts also highly difficult.Due to low NOx combustion utensil
Have technology maturation, using it is easy, investment cost is small and does not increase operating cost, with can be by above-mentioned several low NOx technologies
The advantage that principle combines, therefore generally as the one preferred technique of reduction coal-fired boiler NOx discharge, in coal-fired power station boiler
In be also widely applied.Many documents show low-NOx combustor technology compared with other single NOx control technologies, from
Denitration efficiency, investment cost, operating cost, technology maturity etc. have very big advantage on considering.
At present, the strict control with the country to NOx, the application of low-NOx combustor is also more and more extensively, but existing low nitrogen
Burner limited to NOx control, be nothing like boiler oil fire again with the classification of air solid or flue gas recirculation, it is and existing
Boiler oil fire again with the classification of air solid or flue gas recirculation application is upper also exist many problem of, it is and now many
Power plant all thirst for having one kind have both boiler oil fire again, the classification of air solid or flue gas recirculation function and simple system, operation
Easily, flexible adjustment and the low-NOx pulverized coal burner of NOx emission can be reduced.
The measure of garden straight flow combustion mode is cut in pulverized-coal fired boiler corner mainly following several 1. low excess air burnings；2.
Researched of Air Staging Combustion Burning Pulverized Coal；3. fuel-staged combustion；4. flue gas recirculation；5. low-NOx combustor.Current country's low NOx combusting technology
Predominantly pulverized coal bias combustion adds Researched of Air Staging Combustion Burning Pulverized Coal, and coal powder light-dark separation is general to use elbow or venetian blind type, organizes simultaneously
The air quantity that burns is classified along burner hearth vertical direction, and the general principle of Researched of Air Staging Combustion Burning Pulverized Coal is：Air capacity needed for burning is divided into two
Level feeding burner hearth, makes in main burning area excess air coefficient 80% or so, so that the oxygen concentration for reducing combustion zone also drops
The low temperature levels of combustion zone, fuel first burns under the conditions of oxygen debt so that burning velocity and temperature reduction, delays burning
Process；A large amount of nitrogen-containing groups react with NOx in reducing atmosphere, improve conversion ratios of the NOx to N2, reduce NOx at this
The growing amount in one region；Will remaining air needed for burning（30% or so）Pass through the fire air nozzle being arranged in above main burner
（SOFA）Burner hearth is sent into, after burnout degree is fed, as oxygen-enriched combusting area.Now though air capacity is more, because flame temperature is low,
And the most of nitrogen-containing group separated out in coal has reacted completion in primary zone, final NOx generation amount is little, while the infeed of air
Make the abundant after-flame of residual coke in pulverized coal particle, it is ensured that the high burning efficiency of coal dust, vertical air fractional combustion can in final stove
NOx generation amount is set to reduce by 30~40%.
In recent years, in order to improve power boiler burning technology, save igniting and help fuel oil, reduction coal consumption, it is domestic many
Unit researchs and develops the coal burner of a variety of patterns, and the popularization and application on many station boilers, achieves certain warp
Ji benefit.Wherein, pulverized coal bias combustion mode, is highly valued at home, no matter in theoretical research, experimental study and burning
In terms of technological development, there is more achievement.
Concentration of pulverized coal is suitably improved in the tangential combustion of corner, reinforcing coal powder ignition can be reached and steady
Surely the purpose burnt.Meanwhile, coal powder density is properly increased, boiler NOx discharge capacity can be reduced, boiler at low load is run
Have certain effect.
What is mainly applied in terms of light combustion technology is impacting type Dense Dilute Pulverized Coal Separator.It mainly uses breeze airflow to rush
Hit after guide pad, pulverized coal particle is turned to because of bounce-back, make because the inertia ratio air of pulverized coal particle is much bigger, thus by inertia
With coal dust is assembled in dense side.
Research shows, the Volatile and combustion process at coal powder ignition initial stage are to cutting down whole NOx discharge to closing weight
Will, it is used to carry the chemical equivalent fluctuation that the relatively volatile divided combustion of First air of coal dust needs for different volatile matter content coals
Very big, many situations are in oxygen-enriched state for volatile combustion not oxygen debt state, therefore existing low NOx combustion skill
It is the low nitrogen less effective of art, unstable.Due to reducing the air intake of lower furnace, the reduced stiffness of wind, combustion zone mixing diffusion
Weaken, combustion flame is elongated, flame high temperature location is delayed, causes easily main burning area water-cooling wall, downstream burners spout occur
Coking.Garden burning low NOx combusting technology generally existing problem is cut in country pulverized coal fired boiler corner at present：Low nitrogen less effective, no
Stable, main burning area slagging.
The content of the invention
The purpose of this utility model be to solve the above problems worked well there is provided a kind of simple system, low nitrogen, it is stable and
Main burning area is difficult the low nitrogen oxide burning device of slagging.
In order to solve the above problems, the technical solution adopted in the utility model is as follows：
The light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow, its section of burner hearth is square, furnace wall corner point
She You air inlet, it is characterised in that the air inlet includes central air hose, the periphery of the central air hose from inside to outside according to
Secondary to be arranged concentrically once airduct and wind differential mechanism, the primary air piping is divided into high speed wind inlet and low speed wind inlet, the height
Fast wind inlet sidepiece is provided with secondary air channel, and the secondary air channel air channel is consistent with high speed wind inlet air channel.
The wind for carrying dust secretly is divided into by optimization of the present utility model, the wind differential mechanism using the wind speed baffle plate of diverse location
High speed winds and low velocity wind.
Further optimization, the wind speed baffle plate composition of wind differential mechanism interlaced arrangement successively, the wind speed baffle plate and level
Face angle is 30-45 degree.
Operation principle of the present utility model and its have the beneficial effect that：
The measure principle for controlling the growing amount of NOx in combustion process to be taken is：（1）Excess air coefficient is reduced, is made
Coal dust burns under the conditions of oxygen debt；（2）Ignition temperature is reduced, area of localized hyperthermia is prevented；（3）Shorten flue gas in high-temperature region
Residence time.
Shown in reference explanation book accompanying drawing 2 and accompanying drawing 4, wind differential mechanism will carry the wind point of dust secretly by the baffle plate of diverse location
For high speed winds and low velocity wind, one reverse with conventional blind formula fine coal ring shaped separator is designed a wind snout front portion
Secondary wind differential mechanism and a positive wind snout, per angle primary air jet：It is light to fiery side（Low speed）Coal dust, back-fire side are dense
（At a high speed）Coal dust, such primary air jet ignites the extension of decreased effectiveness ignition time, volume smoking tolerance increase, relative reduction
Flame range excess air coefficient；Because coal powder light-dark is reverse with respect to illusion circle, multiple jetses direction, flow velocity have differences, in burner hearth
Four well mixed combustion centre of relative distribution are formed centrally, area of localized hyperthermia is reduced；Because primary air jet ignites effect
Weaken, main burning occurs at the higher burner hearth center of flow velocity axially upwards, therefore the relative contracting of residence time of the flue gas in high-temperature region
It is short.At utmost meet the measure principle that the growing amount of NOx in control combustion process is taken.The secondary air channel is pressed close to
High speed airduct is blown into, isolate primary air piping high speed winds and be in charge of with furnace wall interior contact, the flue gas of entrainment dust is not contacted
Tube wall, therefore anti-coking.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation in the utility model combustion furnace section；
Fig. 2 is the structural representation of the utility model wind differential mechanism；
Fig. 3 is the structural representation of the utility model primary air nozzle；
Fig. 4 is the utility model combustion furnace operation principle schematic diagram；
Description of reference numerals：Furnace wall -1, air inlet -2, central air hose -21, primary air piping -22, high speed wind inlet -221,
Low speed wind inlet -222, wind differential mechanism -23, wind speed baffle plate -231, air inlet -232, dividing plate -233, high speed winds outlet -234, it is low
Fast wind outlet -235, secondary air channel -24；
To fiery side -001, back-fire side -002, illusion circle -003, high-temperature region -004.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that advantage of the present utility model
It can be easier to be readily appreciated by one skilled in the art with feature, so as to make protection domain of the present utility model apparent clear and definite
Define.
Refering to shown in Figure of description 1, Fig. 2 and Fig. 3, the utility model provides that differential heat backflow is light dense two-way surely to fire low nitrogen
Oxide burn device, its section of burner hearth is square, and 1 four jiaos of furnace wall is respectively equipped with air inlet 2, it is characterised in that the air intake
Mouth 2 includes central air hose 21, and once airduct 22 and wind are arranged concentrically successively from inside to outside in the periphery of the central air hose 21
Differential mechanism 23,22 points of the primary air piping is high speed wind inlet 221 and low speed wind inlet 222, the sidepiece of high speed wind inlet 221
Provided with secondary air channel 24, the secondary air channel air channel is consistent with high speed wind inlet air channel.
The operation principle of present embodiment and its have the beneficial effect that：
The measure principle for controlling the growing amount of NOx in combustion process to be taken is：（1）Excess air coefficient is reduced, is made
Coal dust burns under the conditions of oxygen debt；（2）Ignition temperature is reduced, area of localized hyperthermia is prevented；（3）Shorten flue gas in high-temperature region
Residence time.
Shown in reference explanation book accompanying drawing 4, the wind for carrying dust secretly is divided at a high speed by wind differential mechanism by the baffle plate of diverse location
Wind and low velocity wind, it is poor in one First air reverse with conventional blind formula fine coal ring shaped separator of a wind snout front portion design
Fast device and a positive wind snout, per angle primary air jet：It is light to fiery side 001（Low speed）Coal dust, back-fire side 002 are dense
（At a high speed）Coal dust, such primary air jet ignites the extension of decreased effectiveness ignition time, volume smoking tolerance increase, relative reduction
Flame range excess air coefficient；Due to coal powder light-dark with respect to illusion circle 003 reversely, multiple jetses direction, flow velocity have differences, burner hearth
Four well mixed combustion centre of relative distribution are centrally formed, area of localized hyperthermia 004 is reduced；Because primary air jet ignites
Decreased effectiveness, main burning occurs at the higher burner hearth center of flow velocity axially upwards, therefore flue gas is in the residence time of high-temperature region 004
It is relative to shorten.At utmost meet the measure principle that the growing amount of NOx in control combustion process is taken.The Secondary Air
Pipe is pressed close to high speed airduct and is blown into, isolate primary air piping high speed winds and be in charge of with furnace wall interior contact, make the flue gas of entrainment dust
Do not contact tube wall, therefore anti-coking.
Optimization of the present utility model, as shown in Figure of description 2, the wind differential mechanism 23 is kept off using the wind speed of diverse location
The wind for carrying dust secretly is divided into high speed winds and low velocity wind by plate 231, and the side of wind differential mechanism 23 is air inlet 232, and side passes through
233 points of dividing plate is high speed winds outlet 234 and low velocity wind outlet 235.
Further optimization, the wind speed baffle plate 231 of the wind differential mechanism 23 interlaced arrangement successively is constituted, the wind speed baffle plate
231 be 30-45 degree with horizontal plane angle.The two ends of wind speed baffle plate 231 are fixed on the two side of wind differential mechanism 23.
General principle of the present utility model, principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, retouching in above-described embodiment and specification
Preference only of the present utility model is stated, the utility model is not limited by above-mentioned preference, is not departing from the utility model
On the premise of spirit and scope, the utility model can also have various changes and modifications, and these changes and improvements both fall within this practicality
In new claimed scope.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (3)
1. the light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow, its section of burner hearth is square, furnace wall corner difference
Provided with air inlet, it is characterised in that the air inlet includes central air hose, in the periphery of the central air hose from inside to outside successively
Once airduct and wind differential mechanism are arranged concentrically, the primary air piping is divided into high speed wind inlet and low speed wind inlet, the high speed
Wind inlet sidepiece is provided with secondary air channel, and the secondary air channel air channel is consistent with high speed wind inlet air channel.
2. the light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow according to claim 1, it is characterised in that institute
State wind differential mechanism and the wind for carrying dust secretly is divided into high speed winds and low velocity wind using the wind speed baffle plate of diverse location.
3. the light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow according to claim 2, it is characterised in that institute
The wind speed baffle plate composition of wind differential mechanism interlaced arrangement successively is stated, the wind speed baffle plate and horizontal plane angle are 30-45 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720141799.5U CN206469254U (en) | 2017-02-17 | 2017-02-17 | The light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow |
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| CN201720141799.5U CN206469254U (en) | 2017-02-17 | 2017-02-17 | The light dense two-way steady combustion low nitrogen oxide burner of differential heat backflow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827169A (en) * | 2019-03-19 | 2019-05-31 | 中国能源建设集团华北电力试验研究院有限公司 | A kind of boiler low-temperature fume recycle burning system and its application method |
| CN111442275A (en) * | 2020-04-21 | 2020-07-24 | 武汉科技大学 | High-speed burner with large speed difference and low nitrogen oxide |
-
2017
- 2017-02-17 CN CN201720141799.5U patent/CN206469254U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827169A (en) * | 2019-03-19 | 2019-05-31 | 中国能源建设集团华北电力试验研究院有限公司 | A kind of boiler low-temperature fume recycle burning system and its application method |
| CN109827169B (en) * | 2019-03-19 | 2023-09-26 | 中国能源建设集团华北电力试验研究院有限公司 | Boiler low-temperature flue gas recirculation combustion system and application method thereof |
| CN111442275A (en) * | 2020-04-21 | 2020-07-24 | 武汉科技大学 | High-speed burner with large speed difference and low nitrogen oxide |
| CN111442275B (en) * | 2020-04-21 | 2022-04-26 | 武汉科技大学 | High-speed burner with large speed difference and low nitrogen oxide |
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