CN107940446A - A kind of big volume inhales jet stream after-flame wind system and injection method - Google Patents
A kind of big volume inhales jet stream after-flame wind system and injection method Download PDFInfo
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- CN107940446A CN107940446A CN201711294863.4A CN201711294863A CN107940446A CN 107940446 A CN107940446 A CN 107940446A CN 201711294863 A CN201711294863 A CN 201711294863A CN 107940446 A CN107940446 A CN 107940446A
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- Prior art keywords
- burnout degree
- nozzle
- jet stream
- burnout
- layer
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Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000002347 injection Methods 0.000 title claims abstract description 10
- 239000007924 injection Substances 0.000 title claims abstract description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 239000003546 flue gas Substances 0.000 claims description 13
- 239000007921 spray Substances 0.000 claims description 11
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 239000003500 flue dust Substances 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The top layer fire air nozzle on jet stream after-flame wind system, including burner hearth, the front wall arranged on burner hearth and rear wall is inhaled the invention discloses a kind of big volume, it is characterised in that：At least one layer of burnout degree nozzle is equipped with front wall and rear wall between top layer fire air nozzle and main burner, every layer of burnout degree nozzle includes several burnout degree nozzles, at least one layer of burnout degree nozzle on front wall and/or rear wall inhales jet stream burnout degree nozzle for Y types volume, the nozzle includes connected a blast pipe and two discharge pipes, and two discharge pipes are located at the both sides in blast pipe axis horizontal direction；The invention also discloses the injection method that a kind of big volume inhales jet stream burnout degree；The present invention can also reduce furnace outlet carbonomonoxide concentration and unburned carbon in flue dust while nitrogen oxides is further reduced, and improve efficiency of combustion.
Description
Technical field
The present invention relates to a kind of after-flame wind system and injection method, the particularly big volume for pulverized-coal fired boiler to inhale jet stream after-flame
Wind system and injection method.
Background technology
Air staged combustion technology is one of low-NO_x combustion technology that current pulverized-coal fired boiler generally uses, its basic principle is
The combustion process of fuel is completed stage by stage.The air less than theoretical air requirement is fed in main burner region, fuel is fuel-rich
Burn under the conditions of material, combustion zone temperature is horizontal to be reduced, while forms the generation of reducing atmosphere reduction nitrogen oxides.In main burner
Fire air nozzle is arranged in top, and the introducing of burnout degree can provide enough oxygen, with uncompleted burned carbon of the after-flame from reducing zone,
Ensure efficiency of combustion, reduce unburned carbon in flue dust；Since primary zone is fuel-rich combustion region, and burner arrangement is in forward and backward wall,
Therefore all it is distributed in after-flame region major part unburnt gas and uncompleted burned carbon etc. among burner hearth（Depth direction）, and nitrogen oxygen
Compound is then distributed in close to the region of forward and backward wall.And traditional burnout degree is direct current penetrating, reducing zone can be caused to be broken rapidly
Bad, the nitrogen oxides being reduced can generate again in later stage after-flame region because of burnings such as uncompleted burned carbons, results even in flying dust and contains
Carbon amounts is bigger than normal, burning-out zone water-cooling wall slagging, outlet gas temperature windage increase, while also reduces air classification emission reduction nitrogen oxides
Effect.
The content of the invention
The purpose of the present invention is the above-mentioned deficiency for the prior art, there is provided a kind of big volume inhales jet stream after-flame wind system and spray
Shooting method, it can also reduce furnace outlet carbonomonoxide concentration and unburned carbon in flue dust while nitrogen oxides is further reduced,
Improve efficiency of combustion.
In order to achieve the above object, big volume of the invention inhales jet stream after-flame wind system, including burner hearth, the front wall arranged on burner hearth
With the top layer fire air nozzle on rear wall, it is characterised in that：Front wall between top layer fire air nozzle and main burner and after
It is equipped with least one layer of burnout degree nozzle on wall, every layer of burnout degree nozzle includes several burnout degree nozzles, on front wall and/or rear wall
At least one layer of burnout degree nozzle inhale jet stream burnout degree nozzle for Y types volume, which includes a connected blast pipe and two outlet air
Pipe, two discharge pipes are located at the both sides in blast pipe axis horizontal direction；
Each layer burnout degree nozzle on above-mentioned front wall and rear wall can be that Y types volume inhales jet stream burnout degree nozzle；
Each layer burnout degree nozzle of one of them can be that Y types volume inhales jet stream burnout degree nozzle on above-mentioned front wall and rear wall, separately
Each layer burnout degree nozzle on one wall can be direct current burnout degree nozzle；
As a further improvement on the present invention, the depth-width ratio for two discharge pipes that the Y types volume inhales jet stream burnout degree nozzle is 1-6；
The angle of two discharge pipes and blast pipe center line is 5 ° -45 °；Larger depth-width ratio and suitable angle, can improve two discharge pipes
The jet stream rigidity of the burnout degree of ejection, increase entrainment block domain, strengthens volume and inhales effect；
The present invention is used for the injection method that above-mentioned big volume inhales jet stream after-flame wind system, it is characterised in that comprises the following steps：In stove
Spray into several strands of burnout degrees, at least one layer of burnout degree, which passes through Y types volume, to be inhaled jet stream and fire the front wall of thorax reducing zone and rear wall higher slice
Wind nozzle forms two high-speed jet burnout degrees in a certain angle in the horizontal direction to the greatest extent, and big recirculating zone is formed in jet expansion,
Flue gas among burner hearth is rolled up again to suck back and flows to forward and backward wall both sides, will be distributed over the nitrogen oxides weight close to the forward and backward wall of burner hearth
Newly reduced；Remaining each layer sprays into direct current burnout degree by direct current burnout degree nozzle, and the air outlet velocity of direct current burnout degree is less than
The air outlet velocity of two strands of high-speed jet burnout degrees, or roll up suction jet stream burnout degree nozzle also by Y types and spray into several strands in the horizontal direction
Two high-speed jet burnout degrees in a certain angle.
As a further improvement on the present invention, the air outlet velocity of two strands of high-speed jet burnout degrees is 30m/s≤V≤70m/s；
The air outlet velocity of direct current burnout degree is 20m/s≤V≤40m/s；Low-speed DC burnout degree air outlet velocity is relatively low, coordinates the big volume of Y types
Jet stream burnout degree is inhaled, the NOX near front-back wall can be sent among big volume suction vortex, further strengthens volume suction effect；
Through being found in many experiments：The flue gas of fuel-rich still has very strong nitrogen oxides reducing power, and the present invention passes through design
The burnout degree of entraining type rolls up the flue gas among burner hearth to suck back again flows to forward and backward wall both sides, since reducing zone is fuel-rich cigarette
Gas, burner hearth centre fuel-rich flue gas come into full contact with the NOX being distributed near the forward and backward wall of burner hearth, can further reduce NOX,
Air classification effect can be strengthened, reduce furnace outlet amount of nitrogen oxides, while the reflux of flue gas can carry unburned particle secretly, prolong
The long grain residence time, can reduce outlet CO concentration and unburned carbon in flue dust while nitrogen oxides is reduced, and improve burning effect
Rate.
In conclusion it is dense can also to reduce furnace outlet carbon monoxide while nitrogen oxides is further reduced by the present invention
Degree and unburned carbon in flue dust, improve efficiency of combustion.
Brief description of the drawings
Fig. 1 is the stereogram for the burner hearth that jet stream after-flame wind system is inhaled using the big volume of the present invention.
Fig. 2 is the vertical view for every layer of burnout degree nozzle of forward and backward wall that the big volume of the present invention inhales jet stream burnout degree system embodiment one
Figure.
Fig. 3 is the front view that Y types volume inhales jet stream burnout degree nozzle in Fig. 2.
Fig. 4 is the top view of Fig. 3.
Fig. 5 is the vertical view for every layer of burnout degree nozzle of forward and backward wall that the big volume of the present invention inhales jet stream burnout degree system embodiment two
Figure.
Fig. 6 is the vertical view for every layer of burnout degree nozzle of forward and backward wall that the big volume of the present invention inhales jet stream burnout degree system embodiment three
Figure.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in further detail.
As shown in Figure 1, front wall 1 and rear wall in Pulverized Coal fired Boiler Furnace 5（It is not shown）On along short transverse layering setting
There are main burner 2, top layer fire air nozzle 3, top layer fire air nozzle 3 is located at the top of main burner 2, therebetween for burner hearth also
Former area；Burnout degree nozzle 4 is equipped with front wall 1 and rear wall between top layer fire air nozzle 3 and main burner 2；
Embodiment one
As shown in Figures 2 to 4, the big volume of the present embodiment inhales jet stream after-flame wind system, including burner hearth 5, the front wall 1 arranged on burner hearth 5
With the top layer fire air nozzle 3 on rear wall 6, on the front wall 1 and rear wall 6 between top layer fire air nozzle 3 and main burner
Equipped with two layers of burnout degree nozzle, every layer of burnout degree nozzle includes several burnout degree nozzles 4, the burnout degree nozzle on front wall and rear wall
4 inhale jet stream burnout degree nozzle for Y types volume, which includes connected a blast pipe 7 and two discharge pipes 8, and two discharge pipes 8 are located at
The both sides in 7 axis horizontal direction of blast pipe, the depth-width ratio H/K of two discharge pipes is 1-6；Two discharge pipes and blast pipe center line
Angle α is 5 ° -45 °；
The injection method of jet stream after-flame wind system is inhaled for above-mentioned big volume, is comprised the following steps：1 He of front wall in burner hearth reducing zone
Point four layers of ground spray into several strands of burnout degrees on wall 6 afterwards, and every layer of burnout degree rolls up two outlet air for inhaling jet stream burnout degree nozzle 4 by Y types
Pipe 8 forms two strands of high-speed jet burnout degrees in a certain angle in the horizontal direction, its air outlet velocity is 30m/s≤V≤70m/s,
Big recirculating zone is formed in jet expansion, the flue gas among burner hearth 5 is rolled up to suck back again flows to forward and backward wall both sides, will be distributed over
Nitrogen oxides close to the forward and backward wall of burner hearth re-starts reduction；Top layer fire air nozzle 3 sprays into direct current burnout degree, it goes out one's intention as revealed in what one says
Speed is 20m/s≤V≤40m/s, and the air outlet velocity of consistently lower than two strands high-speed jet burnout degrees.
Since through sedimentation furnace, experimental results demonstrate the flue gas of fuel-rich still has very strong nitrogen oxides reducing power, originally
Flue gas among burner hearth 5 is rolled up to suck back by designing the burnout degree of reducing zone entraining type by invention again flows to forward and backward wall both sides, by
It is fuel-rich flue gas in reducing zone, burner hearth centre fuel-rich flue gas comes into full contact with the NOX being distributed near the forward and backward wall of burner hearth,
NOX can be further reduced, air classification effect can be strengthened, furnace outlet amount of nitrogen oxides is reduced, before and after tradition
Wall burnout degree liquidates feeding mode, and NOX can reduce about 10% or so；The reflux of flue gas at the same time can carry unburned particle, extension secretly
The grain residence time, can reduce outlet CO concentration and unburned carbon in flue dust while nitrogen oxides is reduced, and improve efficiency of combustion；Compared with
Big depth-width ratio H/K and suitable angle α, can improve the jet stream rigidity of the burnout degree of two discharge pipes 8 ejection, increase entrainment block
Domain, strengthens volume and inhales effect.
As shown in Figure 5 to Figure 6, compared with embodiment one, the big volume of embodiment two and three inhales jet stream after-flame wind system, it is poor
It is not only that：One layer of burnout degree nozzle is equipped with front wall 1 and rear wall 6 respectively, every layer of burnout degree nozzle includes several after-flames
Burnout degree nozzle 4 on wind nozzle, only front wall 1 or rear wall 6 is rolled up for Y types inhales jet stream burnout degree nozzle, each on another wall 6 or 1
Layer burnout degree nozzle is direct current burnout degree nozzle 9；
Big volume for embodiment two or three inhales the injection method of jet stream after-flame wind system, comprises the following steps：Reduced in burner hearth
Point four floor ground sprays into several strands of burnout degrees on the front wall 1 in area or rear wall 6, and every layer of burnout degree is inhaled jet stream burnout degree by Y types volume and sprayed
Two discharge pipes 8 of mouth 4 form two strands of high-speed jet burnout degrees in a certain angle in the horizontal direction, its air outlet velocity is 30m/s
≤ V≤70m/s, forms big recirculating zone in jet expansion, the flue gas among burner hearth 5 is rolled up to suck back again flows to forward and backward wall two
Side, the nitrogen oxides that will be distributed over close to the forward and backward wall of burner hearth re-start reduction；Lead on corresponding rear wall 6 or front wall 1
To cross direct current burnout degree nozzle 9 and spray into four layers of direct current burnout degree, its air outlet velocity is 20m/s≤V≤40m/s, and consistently lower than two
The air outlet velocity of stock high-speed jet burnout degree.Using front wall（Or rear wall）Arrange that the big volume of Y types inhales jet stream burnout degree, then wall（Before
Wall）Using low-speed DC burnout degree, low-speed DC burnout degree air outlet velocity is relatively low, coordinates the big volume of Y types to inhale jet stream burnout degree, can be with
Among NOX near front-back wall is sent to big volume suction vortex, further strengthen volume suction effect.
Claims (6)
1. a kind of big volume inhales the top layer burnout degree spray on jet stream after-flame wind system, including burner hearth, the front wall arranged on burner hearth and rear wall
Mouthful, it is characterised in that：At least one layer of after-flame is equipped with front wall and rear wall between top layer fire air nozzle and main burner
Wind nozzle, every layer of burnout degree nozzle include several burnout degree nozzles, and at least one layer of burnout degree nozzle on front wall and/or rear wall is
Y types volume inhales jet stream burnout degree nozzle, which includes connected a blast pipe and two discharge pipes, and two discharge pipes are located at blast pipe axis
The both sides of line horizontal direction.
2. a kind of big volume according to claim 1 inhales jet stream after-flame wind system, it is characterised in that：It is each on front wall and rear wall
Layer burnout degree nozzle is that Y types volume inhales jet stream burnout degree nozzle.
3. a kind of big volume according to claim 1 or 2 inhales jet stream after-flame wind system, it is characterised in that：On front wall and rear wall
Each layer burnout degree nozzle of one of them is rolled up for Y types inhales jet stream burnout degree nozzle, and each layer burnout degree nozzle on another wall is straight
Flow burnout degree nozzle.
4. a kind of big volume according to any one of claims 1 to 3 inhales jet stream after-flame wind system, it is characterised in that：The Y types volume
The depth-width ratio for inhaling two discharge pipes of jet stream burnout degree nozzle is 1-6；The angle of two discharge pipes and blast pipe center line is 5 °-
45°。
5. the injection method of jet stream after-flame wind system is inhaled for big volume as claimed in claim 1, it is characterised in that including following step
Suddenly：Several strands of burnout degrees are sprayed into the front wall of burner hearth reducing zone and rear wall higher slice, at least one layer of burnout degree passes through Y types volume and inhales
Jet stream burnout degree nozzle forms two high-speed jet burnout degrees in a certain angle in the horizontal direction, and big return is formed in jet expansion
Area is flowed, the flue gas among burner hearth is rolled up again to suck back flows to forward and backward wall both sides, will be distributed over the nitrogen oxygen close to the forward and backward wall of burner hearth
Compound re-starts reduction；Remaining each layer sprays into direct current burnout degree or also sprays into several strands in a certain angle two high in the horizontal direction
Rapid fire stream burnout degree, the air outlet velocity of direct current burnout degree are less than the air outlet velocity of two strands of high-speed jet burnout degrees.
6. the injection method of jet stream burnout degree is inhaled according to big volume as claimed in claim 5, it is characterised in that two bursts of high-speed jet combustions
The air outlet velocity of wind to the greatest extent is 30m/s≤V≤70m/s；The air outlet velocity of direct current burnout degree is 20m/s≤V≤40m/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711294863.4A CN107940446B (en) | 2017-12-08 | 2017-12-08 | Large entrainment jet flow over-fire air system and jet method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711294863.4A CN107940446B (en) | 2017-12-08 | 2017-12-08 | Large entrainment jet flow over-fire air system and jet method |
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| Publication Number | Publication Date |
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| CN107940446A true CN107940446A (en) | 2018-04-20 |
| CN107940446B CN107940446B (en) | 2024-01-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111146544A (en) * | 2019-12-30 | 2020-05-12 | 电子科技大学 | Efficient cooling structure for small high-power millimeter wave device |
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| CN107940446B (en) | 2024-01-16 |
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