CN109931605A - A kind of outside dense interior light turbulent burner of diameter of multistage air distribution - Google Patents
A kind of outside dense interior light turbulent burner of diameter of multistage air distribution Download PDFInfo
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- CN109931605A CN109931605A CN201910301071.8A CN201910301071A CN109931605A CN 109931605 A CN109931605 A CN 109931605A CN 201910301071 A CN201910301071 A CN 201910301071A CN 109931605 A CN109931605 A CN 109931605A
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- 239000003245 coal Substances 0.000 claims abstract description 79
- 239000002817 coal dust Substances 0.000 claims description 51
- 230000001965 increasing effect Effects 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 71
- 230000003134 recirculating effect Effects 0.000 abstract description 14
- 239000000446 fuel Substances 0.000 abstract description 5
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 230000001535 kindling effect Effects 0.000 abstract 1
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- 238000002485 combustion reaction Methods 0.000 description 27
- 239000000203 mixture Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Nitrogen oxides compound Chemical class 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
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Abstract
A kind of outside dense interior light turbulent burner of diameter of multistage air distribution, it is related to a kind of burner, the present invention is to solve existing burner since pulverized coal concentrator enrichment factor is low, it is unfavorable for the stability of reduction and the burning of NOx, the problem of stability of burner recirculating zone is poor, cannot be well adapted for multi items burning of coal.The present invention includes central tube, primary air piping, inner second air pipe, middle secondary air channel, outer second air pipe, pulverized coal concentrator and flow spoiler；Central tube, primary air piping, inner second air pipe, middle secondary air channel and outer second air pipe are successively set in together from inside to outside, central tube, primary air piping, inner second air pipe, middle secondary air channel and outer second air pipe outlet end be successively arranged First air flaring, inner second air flaring, the flaring of middle Secondary Air and outer second air flaring；Pulverized coal concentrator and flow equalizing ring are provided in First air air hose.The present invention reduces nitrogen oxides, and the kindling ability of burner is improved, and improves the steady fuel efficiency fruit of burner.The present invention is suitable for boiler.
Description
Technical field
The present invention relates to a kind of burners, and in particular to a kind of outside dense interior light turbulent burner of diameter of multistage air distribution.
Background technique
Traditional boiler vortex burner is since the flow perturbation at burning initial stage is strong and Secondary Air is mixed into quickly, easy shape
At oxygen-enriched combusting area, and flame is short, and heat release is concentrated, and flame temperature is high, so NOx discharge is very high.Therefore occur very much
Low NOx cyclone burner, it is by secondary air separating into multistage, and coal dust is sent into burner hearth by First air, passes through point of multistage wind
Grade burning extends burning time of coal dust, air classification be in order to achieve the purpose that postpone mixing and control combustion process,
Air capacity required for maintaining stable ignition and volatile combustion is only sent into primary combustion zone, forms concentrated phase core flame, reduces
Peak flame temperature；Due to postponing being mixed into for Secondary Air, reducing zone is formd, the production quantity of NOx is not only can be reduced but also can make
Part NOxReduction.
The outer dense interior light turbulent burner of current low NOx, since pulverized coal concentrator mostly uses venturi pulverized coal concentrator,
First air coal dust is in outer dense interior light distribution, i.e. primary air piping inner wall area coal after the inspissation of inspissator radially
Powder concentration is high, and central air hose outer wall area coal powder density is low, realizes the fractional combustion of fuel, can effectively reduce the life of nitrogen oxides
At the combustion stability with raising coal dust, the enrichment factor of the type inspissator is lower, generally between 60%~75%, is unfavorable for
The stability of reduction and the burning of NOx, the stability of burner recirculating zone is poor, therefore can only adapt to the high bituminous coal of fugitive constituent and brown
Coal, the phenomenon that incomplete combustion will appear for other coals.
Summary of the invention
The present invention in order to solve existing turbulent burner since pulverized coal concentrator enrichment factor is low, be unfavorable for NOx reduction and
The stability of the stability of burning, burner recirculating zone is poor, can only adapt to the high coal of fugitive constituent, cannot be well adapted for more product
The problem of kind burning of coal, and a kind of outside dense interior light turbulent burner of diameter of multistage air distribution is provided.
The technical solution adopted by the present invention to solve the above technical problem is:
Scheme one: it is a kind of multistage air distribution diameter outward dense interior light turbulent burner include central tube, primary air piping, interior two
Secondary air hose, middle secondary air channel, outer second air pipe, inner swirler, outer swirler, secondary air bellow, flow spoiler, pulverized coal concentrator and
Flow equalizing ring；
Central tube, primary air piping, inner second air pipe, middle secondary air channel and outer second air pipe are successively sleeved on one from inside to outside
It rises, and adjacent sequentially forms First air channel, inner second air channel, middle secondary air channel and outer secondary from inside to outside between the two
Wind channel, primary air piping, inner second air pipe, middle secondary air channel and outer second air pipe outlet end correspond and be equipped with First air and expand
The inner wall of the outlet end of primary air piping is arranged in mouth, inner second air flaring, the flaring of middle Secondary Air and outer second air flaring, flow spoiler
On, inner swirler is arranged in middle secondary air channel, and outer swirler is arranged in outer secondary air channel；
Pulverized coal concentrator includes support plate and N number of concentration ring, and N is the integer of 2-5；
The diameter of N number of concentration ring is sequentially increased along First air coal dust flow direction, is in one between two neighboring concentration ring
Set a distance setting, N number of concentration ring are fixed together by support plate, and support plate is fixed on the outer wall of central tube, N number of concentration ring
The side setting of neighbouring central tube outlet；
Flow equalizing ring is arranged on the inner wall of primary air piping, and the side setting of the neighbouring concentration ring being relatively large in diameter of flow equalizing ring.
Further, the flow spoiler is made of M plate face in conplane trapezoidal plate, and M is the integer of 8-16, and M is a
Trapezoidal plate is evenly arranged in the outlet end of the inner wall of primary air piping, and two neighboring trapezoidal plate is arranged in certain interval, Mei Geti
The length of shape plate is the outer wall of central tube to 0.1~0.4 times of inner wall distance of primary air piping.
Scheme two: it is a kind of multistage air distribution diameter outward dense interior light turbulent burner include central tube, primary air piping, interior two
Secondary air hose, outer second air pipe, inner swirler, outer swirler, secondary air bellow, flow spoiler, pulverized coal concentrator, flow equalizing ring and interval
Cylinder；
Central tube, primary air piping, interval cylinder, inner second air pipe and outer second air pipe are successively set in together from inside to outside,
First air channel is formed between central tube and primary air piping, interval cylinder, inner second air pipe and the adjacent the two of outer second air pipe are by interior
Inner second air channel and outer second air channel are sequentially formed outward, the both ends for being spaced cylinder pass through annular slab respectively and primary air piping is solid
Connect to form enclosure space, the outlet end of primary air piping, inner second air pipe and outer second air pipe correspond be equipped with First air flaring,
Inner second air flaring and outer second air flaring, flow spoiler are arranged on the inner wall of the outlet end of primary air piping, inner swirler setting
In interior secondary air channel, outer swirler is arranged in outer secondary air channel；
Pulverized coal concentrator includes support plate and N number of concentration ring, and N is the integer of 2-5；
The diameter of N number of concentration ring is sequentially increased along First air coal dust flow direction, is in one between two neighboring concentration ring
Set a distance, N number of concentration ring are fixed together by support plate, and support plate is fixed on the outer wall of central tube, and N number of concentration ring is neighbouring
The side setting of central tube outlet；
Flow equalizing ring is arranged on the inner wall of primary air piping, and the side setting of the neighbouring concentration ring being relatively large in diameter of flow equalizing ring.
Compared with the prior art, the invention has the following beneficial effects:
One, buner system resistance of the invention is low, and total secondary wind resistance is no more than 800Pa, save blower power consumption and
The present invention can keep the stability of burning very well under all loads, and spout does not generate coking.
Two, compared with the prior art, the present invention realizes First air coal by a kind of novel pulverized coal concentrator and flow equalizing ring
The air-coal separating of powder, separative efficiency can reach 90%, that is, realize the fuel-staged combustion of First air coal dust, and can be fine
The First air wind speed for reducing First air near-wall, effectively reduces First air coal dust intermixture and washes away to First air tube wall,
Extend the service life of equipment.First air of the invention carries coal dust and enters First air channel, as shown in figures 12 and 14, in coal
Under the inspissation of powder enrichment facility, First air coal dust is divided into deep or light two parts, forms dense coal close to First air inner tube wall region
Powder region forms thin powdered coal region close to central air hose exterior surface area, and coal powder light-dark ratio realizes one between 75-90%
Along primary air piping diameter, dense interior light distribution form, a large amount of coal dust concentrate on primary air piping inner surface and nearby spray secondary wind coal dust outward
Enter burner hearth, realize the fractional combustion of coal dust, increases the coal dust amount of intermediate high temperature recirculation zone, so that the reducing atmosphere of Central backflow area
Reinforce, extends coal dust in the residence time of recirculating zone, inhibit the generation of fuel NO.
Three, the air of main combustion is divided into three inner second air, middle Secondary Air and outer second air levels to increase sky by the present invention
Gas is classified degree, as shown in Figure 12 burner outlet VELOCITY DISTRIBUTION cloud atlas, forms a stable center in burner outlet and returns
Flow area while, there are a low regime between First air and Secondary Air, postponed the mixing of First air and Secondary Air, be because of
Inner second air is one non-swirl secondary air and air quantity is small, and wind speed is low, therefore the ability that its penetration capacity and volume inhale First air is weak, will not
Volume inhales First air too early, increases the distance between First air and peripheral mainstream Secondary Air, it is secondary with eddy flow to have postponed First air
The reducing atmosphere of Central backflow area is reinforced in the mixing of wind, inhibits the generation of nitrogen oxides, meanwhile, middle Secondary Air and outer secondary
Wind is all formed as Whirl deposite tank after inner swirler and outer swirler and injects burner hearth, and speed is larger, and effect is far from burning
Device exit region completes the burning of uncompleted burned carbon, and guarantees that the area Jin Ran forms a stable recirculating zone.
Four, the air of main combustion is divided into inner second air and outer second air fractional combustion by the present invention, while primary air piping and interior
Setting interval cylinder between secondary air channel exports in the present invention as shown in figure 12 and forms a stable Central backflow area, while one
There are a vulgar area between secondary wind and Secondary Air, the mixing of First air and Secondary Air has been postponed, has been because being arranged in First air
There are an interval cylinders between inner second air, so that outlet end First air mixture of the invention and Secondary Air are in interval spray
Enter, increases the distance between First air and peripheral mainstream Secondary Air, postponed the mixing of First air and swirl secondary air, reinforce
The reducing atmosphere of Central backflow area inhibits the generation of nitrogen oxides.Meanwhile inner second air and outer second air all pass through inward eddy
Whirl deposite tank is formed after device and outer swirler and injects burner hearth, and speed is larger, and effect is completed not far from exit region of the present invention
The burning of after-flame carbon, and guarantee that the area Jin Ran forms a stable recirculating zone.
Five, the present invention is provided with flow spoiler on the inner surface of primary air piping outlet end, and flow spoiler is by M trapezoidal board groups
At and be evenly arranged on the circumference of primary wind pipe, M be 8-16 integer；The length of flow spoiler is central air hose and primary air piping
The distance between 0.1~0.4 times, it is by Figure 12 concentration of pulverized coal distribution schematic diagram it is found that primary under a combination thereof effect
Wind thick coal culm is under the action of flow spoiler, in a circumferential direction in the distribution side of deep or light alternate one thin powdered coal of one thick coal culm
Formula, the coal powder density for improving First air outlet section part reinforce the fractional combustion of coal dust, are particularly conducive to improve burner stable
It fires performance and reduces the generation of nitrogen oxides.Simultaneously because the presence of flow spoiler, breeze airflow is around when flowing through flow spoiler, in its circle
Week forms small whirlpool circle, is attached to the root of high temperature recirculation zone, and in small whirlpool area, coal dust, which easily catches fire, strengthens coal powder ignition spy
Property, guarantee the steady combustion characteristic of burner.
Six, the present invention strengthens the eddy flow of inward eddy and contour stealth Secondary Air in middle Secondary Air and outer second air setting flaring
The mixing of Secondary Air and outer second air and primary wind and powder in intensity postponement simultaneously, extending coal dust, the heart flows back in reducing atmosphere
Residence time in area is conducive to NOx reduction, reduces the life of nitrogen oxides to form anaerobic environment in nearly burner region
This.
Seven, under distinctive Pulverized Coal Concentration device of the invention, flaring structure, distinctive allocation of the amount of air compound action, such as scheme
10 to shown in Figure 14, and burner outlet primary wind and powder jet area forms a stable Central backflow area, the Central backflow area
Outer dense interior light First air volume can be drawn onto recirculating zone, high-temperature flue gas is taken back into nearly burner region, heats primary wind and powder, is promoted
Into pulverized coal ignition, guarantee the stability of flame, that realizes different load stablizes burning, and the high-temperature flue gas oxygen content taken back is low, makes
It obtains recirculating zone and is in anaerobic environment, inhibit the generation of nitrogen oxides.
Eight, the enrichment factor of Pulverized Coal Concentration device of the invention is 90% or more, further increases the reduction and burning of NOx
Stability, distinctive Pulverized Coal Concentration device of the invention and the specific flaring composite structure of use, can better adapt to different product
The coal combustion of kind keeps stability when burning more preferable.
Detailed description of the invention
Fig. 1 is the overall structure figure of the present invention program one；
Fig. 2 is partial enlarged view at the I of Fig. 1, and arrow direction is coal dust conveying direction in figure；
Fig. 3 is the schematic diagram of flow spoiler 7；
Fig. 4 is partial enlarged view at the II of Fig. 1；
Fig. 5 is the partial schematic diagram of the first scheme at Fig. 1 middle outlet；
Fig. 6 is the partial schematic diagram of second scheme at Fig. 1 middle outlet；
Fig. 7 is the overall structure figure of the present invention program two；
Fig. 8 is the partial schematic diagram of the first scheme at Fig. 7 middle outlet；
Fig. 9 is the partial schematic diagram of second scheme at Fig. 7 middle outlet；
Figure 10 is present invention outlet cold flow field recirculating zone and extended corner schematic diagram；
Figure 11 is muzzle velocity vector value simulation distribution figure of the present invention；
Figure 12 is distribution of exit velocities numerical simulation cloud atlas of the present invention；
Figure 13 is coal powder density cloud charts in primary air piping of the present invention；
Figure 14 is First air outlet end coal powder density cloud charts of the present invention；
Arrow in Fig. 1 and Fig. 7 in primary air piping 2 is coal dust conveying direction, inner second air pipe 3, middle secondary air channel 4 and outer
Arrow at secondary air channel 5 is air inlet direction.
Specific embodiment
Specific embodiment 1: illustrate present embodiment in conjunction with Fig. 1-Fig. 4, a kind of diameter of multistage air distribution of present embodiment
Outside dense interior light turbulent burner includes central tube 1, primary air piping 2, inner second air pipe 3, middle secondary air channel 4, outer second air
Pipe 5, inner swirler 13, outer swirler 14, secondary air bellow 15, flow spoiler 7, pulverized coal concentrator 6 and flow equalizing ring 8；
Central tube 1, primary air piping 2, inner second air pipe 3, middle secondary air channel 4 and outer second air pipe 5 successively cover from inside to outside
Be fitted together, and it is adjacent sequentially form from inside to outside between the two First air channel, inner second air channel, middle secondary air channel and
Outer second air channel, primary air piping 2, inner second air pipe 3, middle secondary air channel 4 and outer second air pipe 5 outlet end correspond and set
Once wind flaring 9, inner second air flaring 10, middle Secondary Air flaring 11 and outer second air flaring 12, flow spoiler 7 is arranged primary
On the inner wall of the outlet end of air hose 2, inner swirler 13 is arranged in middle secondary air channel, and outer swirler 14 is arranged in outer second air
In channel；
Pulverized coal concentrator 6 includes support plate 6-1 and N number of concentration ring 6-2, N are the integer of 2-5；
It is N number of concentration ring 6-2 diameter be sequentially increased along First air coal dust flow direction, two neighboring concentration ring 6-2 it
Between be arranged in certain distance, N number of concentration ring 6-2 is fixed together by support plate 6-1, and support plate 6-1 is fixed in central tube 1
On outer wall, N number of concentration ring 6-2 is arranged adjacent to the side that central tube 1 exports；
Flow equalizing ring 8 is arranged on the inner wall of primary air piping 2, and the side of the neighbouring concentration ring 6-2 being relatively large in diameter of flow equalizing ring 8
Setting.
Preferably, outer swirler 14 is mounted in secondary air bellow 15,5 water of 2 horizontal segment of primary air piping and outer second air pipe
Flat section is respectively welded on secondary air bellow 15.
Pulverized coal concentrator 6 includes support plate 6-1 and N number of concentration ring 6-2, N are the integer of 2-5；
It is N number of concentration ring 6-2 diameter be sequentially increased along First air coal dust flow direction, two neighboring concentration ring 6-2 it
Between be in certain distance, N number of concentration ring 6-2 is fixed together by support plate 6-1, and support plate 6-1 is fixed in the outer wall of central tube 1
On, N number of concentration ring 6-2 is arranged adjacent to the side that central tube 1 exports.
Preferably, stainless steel outer sleeve resistant ceramic structure is used in concentration ring 6-2, improves the wearability of concentration ring, improves
The service life of ring is concentrated.
The inlet of inner second air pipe 3, middle secondary air channel 4 and outer second air pipe 5 is equipped with damper, each by adjusting
From the size of air door, to adjust the size and intensity of Central backflow area, to adapt to different types of coal, air quantity and the requirement of load, increase
Add the coal adaptability of burner.
Present embodiment First air wind powder mixture as shown in figure 13 is concentrated step by step under the action of pulverized coal concentrator 6, coal
Powder air-flow is divided into deep or light two part, thick coal culm region is formed close to primary air piping inner wall area, close to central air hose outer surface
Region forms thin powdered coal region, radially in outer dense interior light coal powder density distribution, realizes the fractional combustion of coal dust, in increase
Between high temperature recirculation zone coal dust amount, reduce coal powder ignition heat and extend coal dust simultaneously in the residence time of recirculating zone, enhance center and return
The reducing atmosphere for flowing area, inhibits the generation of nitrogen oxides.
Secondary air is divided into inner second air, middle Secondary Air and outer second air by the present invention, increases the present invention radially
Air classification degree, and inner second air is one direct current wind, and air quantity is smaller, while adding the flaring of inner second air, such as schemes
Shown in 12 burner outlet speed cloud atlas distribution schematic diagrams, since this strand of Secondary Air is direct current wind and the small wind speed of air quantity is low, wear
Saturating ability and volume energy-absorbing power are weak, will not premature volume inhale First air, increase the distance between First air and swirl secondary air, push away
The mixing of slow First air coal dust intermixture and peripheral swirl secondary air, reinforces Central backflow area reducing atmosphere, inhibits burning just
The generation of phase nitrogen oxides.
As shown in Figure 10-Figure 14, by burner cold-modeling experiment and numerical simulation calculation shows that, outlet area of the present invention
Domain forms a stable Central backflow area, this recirculating zone is stablized, and reflowing result is good, can roll up outer dense interior light First air
It is drawn onto recirculating zone, the high-temperature flue gas volume in outside is sucked back near burner outlet, heating First air coal dust, promotion coal dust
Fire keeps flame holding, simultaneously because the high-temperature flue gas oxygen content that volume is inhaled is low, so that the central backflow of First air exit region
Area is in anaerobic condition, forms a reducing atmosphere, reduces the generation of nitrogen oxides.
Specific embodiment 2: illustrating present embodiment in conjunction with Fig. 2, the N number of concentration ring 6-2 of present embodiment is circular cone
Ring, and the taper of N number of concentration ring 6-2 is equal, the angle δ of the bus and the center line of central tube 1 of each concentration ring 6-2 is
20 °~40 °.
Other compositions and connection relationship are same as the specific embodiment one.
Specific embodiment 3: illustrate present embodiment in conjunction with Fig. 1, Fig. 5 and Fig. 6, flow equalizing ring 8 described in present embodiment
It is arranged on the inner tubal wall of the primary air piping 2 between First air flaring 9 and pulverized coal concentrator 6, the flow equalizing ring 8 is adjacent to First air
The distance Ls for the end that the end of flaring 9 is flared 9 to First air is the outer wall of central tube 1 to the inner wall distance S1 of primary air piping 2
4~8 times, the thickness Hs of the flow equalizing ring 8 be central tube 1 outer wall to primary air piping 2 inner wall distance S1 0.04~0.1
Times.
Other compositions and connection type are identical with embodiment two.
Specific embodiment 4: illustrating present embodiment in conjunction with Fig. 3, flow spoiler 7 is by M plate face described in present embodiment
It is formed in conplane trapezoidal plate, M is the integer of 8-16, and M trapezoidal plate is evenly arranged in the outlet of the inner wall of primary air piping 2
End, and two neighboring trapezoidal plate, in certain interval setting, the height S of each trapezoidal plate is the outer wall of central tube 1 to primary air piping 2
0.1~0.4 times of inner wall distance S1.
As shown in figure 13, by numerical value calculating analysis shows addition flow spoiler 7, First air thick coal culm is in flow spoiler 7
Under effect, in a circumferential direction in the distribution mode of deep or light alternate one thin powdered coal of one thick coal culm, First air outlet is improved
The coal powder density of section part reinforces the fractional combustion of coal dust, is particularly conducive to improve burner combustion stability and reduces nitrogen oxides
Generation.Simultaneously because the presence of flow spoiler 7, breeze airflow forms small whirlpool circle in its circumference around when flowing through flow spoiler 7,
It is attached to the root of high temperature recirculation zone, in small whirlpool area, coal dust, which easily catches fire, strengthens coal powder ignition characteristic, guarantees the steady combustion of burner
Characteristic.
Other compositions and connection relationship are the same as the specific implementation mode 3.
Specific embodiment 5: illustrate present embodiment in conjunction with Fig. 5, the extended corner of present embodiment First air flaring 9
The range for spending β is 15 °~25 °, and the range of the expanded- angle γ of middle Secondary Air flaring 11 is 20 °~25 °, outer second air flaring 12
Expanded- angle θ range be 20 °~25 °, inner second air flaring 10 expanded- angle υ range be 20 °~25 °.
As shown in Figure 10-Figure 12, is calculated by numerical value and burner cold-modeling experiment knows to use the above different angle
Flaring combination can burner outlet region formed a stable recirculating zone, the present invention can be according to different coals, no
Same burner hearth form, selects different flaring angles to combine, to reach best combustion efficiency, reduces the generation of nitrogen oxides,
And reduce the high temperature corrosion of water-cooling wall.If each flaring angle is excessive, air-flow extended corner can be made to increase, be formed open time
Area is flowed, combustion instability and water-cooling wall coking are caused, if flaring angle is too small, First air mixes too early with Secondary Air, returns
Stream area's range is too small, and be unfavorable for coal dust stablizes burning.
The mixing of primary wind and powder and Secondary Air is postponed in Secondary Air flaring 11 and First air flaring 9 in present embodiment, is extended
Coal dust reduces the generation of nitrogen oxides in the residence time of reducing atmosphere.
Other compositions and connection relationship are identical as specific embodiment four.
Specific embodiment 6: illustrate present embodiment in conjunction with Fig. 5, the flaring of inner second air described in present embodiment 10
End, the end of end and First air flaring 9 of middle Secondary Air flaring 11 is concordant is arranged.
Other compositions and connection relationship are identical as specific embodiment five.
Specific embodiment 7: illustrate present embodiment in conjunction with Fig. 5, the length of the flaring of First air described in present embodiment 9
The length L2 for spending L4, the length L3 of inner second air flaring 10 and middle Secondary Air flaring 11 is equal；First air flaring 9 length L4 be
0.4~0.7 times of the length L1 of outer second air flaring 12.
The primary air powder mixture that wind snout comes out first is premixed with centre wind air-flow, is entered outer second air afterwards and is expanded
Burner hearth is sprayed into together with middle Secondary Air and outer second air air-flow again with interior direct current wind premix in mouthful, by increasing by two premix sections,
Help to form a stable Central backflow area in burner outlet region, extends First air coal dust and stop in Central backflow area
The time is stayed, so that coal dust stablizes burning and effectively inhibits the generation of nitrogen oxides.
Other compositions and connection relationship are identical as specific embodiment six.
Specific embodiment 8: illustrate present embodiment in conjunction with Fig. 6, the flaring of inner second air described in present embodiment 10
Length L3 and the length L2 of the middle Secondary Air flaring 11 are equal；The length L3 of inner second air flaring 10 is outer second air flaring 12
0.6~0.8 times of length L1；The length L4 of First air flaring 9 is 0.5~0.7 times of the length L3 of inner second air flaring 10.
Present embodiment is by increasing by three premix sections, the further mixing of delay primary air powder mixture and Secondary Air,
The swirl strength for enhancing Secondary Air realizes the fractional combustion of coal dust, is more conducive to go out in burner in such a way that three-level premixes
Mouth region domain forms a stable Central backflow area, extends First air coal dust in the residence time of Central backflow area, so that coal dust
Stablize burning and effectively inhibit the generation of nitrogen oxides, is suitable for ub-bituminous coal, meager coal and anthracite.
Other compositions and connection relationship are identical as specific embodiment six.
Specific embodiment 9: illustrating present embodiment in conjunction with Fig. 7, a kind of diameter of multistage air distribution of present embodiment is outside
Dense interior light turbulent burner includes central tube 1, primary air piping 2, inner second air pipe 3, outer second air pipe 5, inner swirler 13, outer
Cyclone 14, secondary air bellow 15, flow spoiler 7, pulverized coal concentrator 6, flow equalizing ring 8 and interval cylinder 16；
Central tube 1, primary air piping 2, interval cylinder 16, inner second air pipe 3 and outer second air pipe 5 are successively sleeved on from inside to outside
Together, First air channel is formed between central tube 1 and primary air piping 2, is spaced cylinder 16,5 phase of inner second air pipe 3 and outer second air pipe
Both adjacent to sequentially form inner second air channel and outer second air channel from inside to outside, the both ends of interval cylinder 16 pass through annular slab respectively
It is a pair of with the outlet end one of the affixed formation enclosure space of primary air piping 2, primary air piping 2, inner second air pipe 3 and outer second air pipe 5
It should be equipped with First air flaring 9, inner second air flaring 10 and outer second air flaring 12, the outlet of primary air piping 2 is arranged in flow spoiler 7
On the inner wall at end, inner swirler 13 is arranged in interior secondary air channel, and outer swirler 14 is arranged in outer secondary air channel；
Pulverized coal concentrator 6 includes support plate 6-1 and N number of concentration ring 6-2, N are the integer of 2-5；
It is N number of concentration ring 6-2 diameter be sequentially increased along First air coal dust flow direction, two neighboring concentration ring 6-2 it
Between be arranged in certain distance, N number of concentration ring 6-2 is fixed together by support plate 6-1, and support plate 6-1 is fixed in central tube 1
On outer wall, N number of concentration ring 6-2 is arranged adjacent to the side that central tube 1 exports；
Flow equalizing ring 8 is arranged on the inner wall of primary air piping 2, and the side of the neighbouring concentration ring 6-2 being relatively large in diameter of flow equalizing ring 8
Setting.
Preferably, outer swirler 14 is mounted in secondary air bellow 15,5 water of 2 horizontal segment of primary air piping and outer second air pipe
Flat section is respectively welded on secondary air bellow 15.
Other compositions and connection relationship are identical as specific embodiment two, three or four.
Specific embodiment 10: illustrating present embodiment in conjunction with Fig. 7, the thickness that cylinder 16 is spaced described in present embodiment is
0.05-0.4 times of inner wall distance S1 to primary air piping 2 of the outer wall of central tube 1.
Other compositions and connection relationship are identical as specific embodiment nine.
Specific embodiment 11: illustrate present embodiment, the extension of present embodiment First air flaring 9 in conjunction with Fig. 7
The range of angle beta is 10 °~20 °, and the range of the expanded- angle θ of outer second air flaring 12 is 20 °~25 °, inner second air flaring
The range of 10 expanded- angle υ is 20 °~25 °.
Other compositions and connection relationship are identical as specific embodiment nine.
Specific embodiment 12: illustrate present embodiment, the flaring of inner second air described in present embodiment 10 in conjunction with Fig. 8
The end of end and First air flaring 9 concordant be arranged.
Other compositions and connection relationship are identical as specific embodiment nine.
Specific embodiment 13: illustrating present embodiment in conjunction with Fig. 8, the flaring of First air described in present embodiment 9
Length L4 and the length L3 of inner second air flaring 10 are equal；The length L4 of First air flaring 9 is the length of outer second air flaring 12
0.4~0.7 times of L1.
Other compositions and connection relationship are identical as specific embodiment 12.
Specific embodiment 14: illustrate present embodiment, the length of present embodiment inner second air flaring 10 in conjunction with Fig. 9
Degree L3 is 0.6~0.8 times of the length L1 of outer second air flaring 12；The length L4 of First air flaring 9 is inner second air flaring 10
0.5~0.7 times of length L3.
Other compositions and connection relationship are identical as specific embodiment nine, ten or 11.
By the burner application of two kinds of forms of the invention to HG-1913/25.4-PM8 type boiler: when using using coal,
Nitrogen oxides compound discharge amount is as follows:
1, when using bituminous coal, Vdaf=26.35%, Aar=22.65%, Mt=10.23%, Qnet, ar=21.18Mj/
(wherein Vdaf is dry ash free basis volatile matter to kg, and Aar is As-received ash content parameter, and Mt is full moisture content parameter, and Qnet, ar are to receive
To base low heat valve), 24 burners are all using the discharge of boiler tail nitrogen oxides after novel burner of the invention
Measure 210mg/m3Below.
2, when using mixed coal of the meager coal 50% with bituminous coal 50%: wherein the chemical analysis of meager coal is as follows: Vdaf=19.9%,
The chemical analysis of Aar=32.65%, Mt=7.2%, Qnet, ar=19.13Mj/kg, metabituminous coal are as follows: Vdaf=
26.35%, Aar=22.65%, Mt=10.23%, Qnet, ar=21.18Mj/kg, 24 burner are all using the present invention
Novel burner after boiler tail nitrogen oxides discharge amount be 270mg/m3 or less.
Show the present invention when using different coals quality by the above experimental data, can guarantee that nitrogen oxides is up to standard, fires
The discharge amount of nitrogen oxides after burning meets relevant regulations standard, can be applicable in more coal burnings.
The working principle of the present invention program one is: primary air powder mixture enters primary air piping 2 via powder feeding pipes, is firing
Pulverized coal concentrator 6 is provided in the primary air piping of burner, the diameter of the concentration ring 6-2 of pulverized coal concentrator 6 is along a wind flow side
To being sequentially increased, primary air powder mixture is divided into two parts after pulverized coal concentrator 6, close to 2 inner wall area of primary air piping
Thick coal culm region is formed, forms thin powdered coal region close to 1 exterior surface area of central air hose, simultaneously because the presence of flow equalizing ring 8, drop
The low wind speed of 2 inner wall area of primary air piping, effectively reduces First air coal dust intermixture washing away to primary air piping 2, extends
Service life of equipment, simultaneously because the presence of flow equalizing ring and flow spoiler 7, First air coal dust is in 2 outlet end of primary air piping in circumferential direction
It is upper light to be spaced apart in one dense one.It realizes the fractional combustion radially and circumferentially of Pulverized Coal, increases central backflow
The fuel quantity in area reduces the generation of nitrogen oxides, improves the steady combustion ability of burner while forming small whirlpool around flow spoiler
Vortex ring is attached to the root of high temperature recirculation zone, and in small whirlpool area, coal dust, which easily catches fire, strengthens coal powder ignition characteristic, guarantees the present invention
Steady combustion characteristic.Secondary Air respectively enters inner second air pipe 3, middle secondary air channel 4 and outer second air pipe by secondary air bellow 15
5, middle Secondary Air is one direct current wind, and air quantity is few, and wind speed is low, and penetration capacity and volume suction First air ability are weak, will not be premature
Volume inhales First air, increases First air at a distance from the mainstream Secondary Air of periphery, has postponed the mixing of First air and Secondary Air, in two
Be provided with inner swirler 13 in secondary air hose 4, outer swirler 14 be provided in outer second air pipe 5 so that in, outer second air generate rotation
Turn, direction of rotation is consistent, in, outer second air spout penetrating burner hearth, forms a suitable center in burner region
Recirculating zone makes coal dust stablize burning, reduces the generation of nitrogen oxides.
The working principle of the present invention program two is: primary air powder mixture enters primary air piping 2, First air via powder feeding pipe
Pulverized coal concentrator 6 is equipped in pipe 2, the diameter of the concentration ring 6-2 of pulverized coal concentrator 6 successively increases along First air coal dust flow direction
Greatly, First air coal dust intermixture is divided into two parts after pulverized coal concentrator 6, and the inner wall area close to primary air piping 2 is formed
Coal dust region, the region close to 1 outer surface of central tube form thin powdered coal region, and due to the effect of flow spoiler 7, First air coal dust exists
In the circumferential direction of the outlet end of primary air piping 2 in one it is dense one it is light be spaced apart, realize Pulverized Coal radially and circumferentially
Fractional combustion increases the fuel quantity of Central backflow area, reduces the generation of nitrogen oxides, improves steady combustion ability of the invention.Simultaneously
Small whirlpool circle is formed around flow spoiler 7, is attached to the root of high temperature recirculation zone, and in small whirlpool area, coal dust easily catches fire by force
Powdered coal fire behaviour guarantees steady combustion characteristic of the invention.Secondary Air respectively enters inner second air pipe 3 by secondary air bellow 15
In outer second air pipe 5, and interval cylinder 16 is provided between primary air piping 2 and inner second air pipe 3, so that outlet end of the present invention
First air coal dust intermixture and Secondary Air are sprayed into interval, are increased First air at a distance from peripheral mainstream Secondary Air, are postponed
The mixing of First air and Secondary Air, inner swirler 13 are arranged in interior secondary air channel, and outer swirler 14 is arranged in outer second air
In channel, so that inside and outside Secondary Air generates rotation, direction of rotation is consistent, sprays into burner hearth by inside and outside overfire air port,
The present invention forms a suitable Central backflow area and coal dust is made to stablize burning, reduces the generation of nitrogen oxides.
Claims (10)
1. a kind of diameter of multistage air distribution dense interior light turbulent burner outward, it is characterised in that: it includes central tube (1), primary
Air hose (2), inner second air pipe (3), middle secondary air channel (4), outer second air pipe (5), inner swirler (13), outer swirler (14),
Secondary air bellow (15), flow spoiler (7), pulverized coal concentrator (6) and flow equalizing ring (8)；
Central tube (1), primary air piping (2), inner second air pipe (3), middle secondary air channel (4) and outer second air pipe (5) are from inside to outside
It is successively set in together, and adjacent sequentially forms First air channel, inner second air channel, middle Secondary Air from inside to outside between the two
Channel and outer second air channel, primary air piping (2), inner second air pipe (3), middle secondary air channel (4) and outer second air pipe (5) go out
Mouth end corresponds and is equipped with First air flaring (9), inner second air is flared (10), middle Secondary Air is flared (11) and outer second air flaring
(12), flow spoiler (7) is arranged on the inner wall of the outlet end of primary air piping (2), and inner swirler (13) setting is logical in middle Secondary Air
In road, outer swirler (14) is arranged in outer secondary air channel；
Pulverized coal concentrator (6) includes support plate (6-1) and N number of concentration ring (6-2), and N is the integer of 2-5；
It is N number of concentration ring (6-2) diameter be sequentially increased along First air coal dust flow direction, two neighboring concentration ring (6-2) it
Between be arranged in certain distance, N number of concentration ring (6-2) passes through support plate (6-1) and is fixed together, during support plate (6-1) is fixed in
On the outer wall of heart pipe (1), the side setting of N number of concentration ring (6-2) neighbouring central tube (1) outlet；
Flow equalizing ring (8) is arranged on the inner wall of primary air piping (2), and the neighbouring concentration ring (6-2) being relatively large in diameter of flow equalizing ring (8)
Side setting.
2. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 1, it is characterised in that:
N number of concentration ring (6-2) is circular cone ring, and the taper of N number of concentration ring (6-2) is equal, the mother of each concentration ring (6-2)
The angle (δ) of line and the center line of central tube (1) is 20 °~40 °.
3. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 1, it is characterised in that: institute
It is described on the inner tubal wall for stating primary air piping (2) of flow equalizing ring (8) setting between First air flaring (9) and pulverized coal concentrator (6)
The distance (Ls) of end of the end of the neighbouring First air flaring (9) of flow equalizing ring (8) to First air flaring (9) is central tube (1)
For outer wall to the inner wall distance 4~8 times of (S1) of primary air piping (2), the thickness (Hs) of the flow equalizing ring (8) is central tube (1)
Inner wall distance 0.04~0.1 times of (S1) of the outer wall to primary air piping (2).
4. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 1, it is characterised in that: institute
It states flow spoiler (7) and is made of M plate face in conplane trapezoidal plate, M is the integer of 8-16, and M trapezoidal plate is evenly arranged in
The outlet end of the inner wall of primary air piping (2), and two neighboring trapezoidal plate is arranged in certain interval, the height (S) of each trapezoidal plate
It is the outer wall of central tube (1) to the inner wall distance 0.1~0.4 times of (S1) of primary air piping (2).
5. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 1, it is characterised in that: one
The range of the expanded- angle (β) of secondary wind flaring (9) is 15 °~25 °, the range of the expanded- angle (γ) of middle Secondary Air flaring (11)
It is 20 °~25 °, the range that outer second air is flared the expanded- angle (θ) of (12) is 20 °~25 °, and inner second air is flared the expansion of (10)
The range for opening up angle (υ) is 20 °~25 °.
6. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 1, it is characterised in that: institute
Stating the end of inner second air flaring (10), the end of middle Secondary Air flaring (11) and First air flaring, the end of (9) is concordant is arranged.
7. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 6, it is characterised in that: institute
State the length of the length (L4) of First air flaring (9), the length (L3) of inner second air flaring (10) and middle Secondary Air flaring (11)
(L2) it is equal；The length (L4) of First air flaring (9) is 0.4~0.7 times of the length (L1) of outer second air flaring (12).
8. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution described in -5 any one according to claim 1,
Be characterized in that: the length (L3) of the inner second air flaring (10) and the length (L2) of the middle Secondary Air flaring (11) are equal；
The length (L3) of inner second air flaring (10) is 0.6~0.8 times of the length (L1) of outer second air flaring (12)；First air flaring
(9) length (L4) is 0.5~0.7 times of the length (L3) of inner second air flaring (10).
9. a kind of diameter of multistage air distribution dense interior light turbulent burner outward, it is characterised in that: it includes central tube (1), primary
Air hose (2), inner second air pipe (3), outer second air pipe (5), inner swirler (13), outer swirler (14), secondary air bellow (15),
Flow spoiler (7), pulverized coal concentrator (6), flow equalizing ring (8) and interval cylinder (16)；
Central tube (1), primary air piping (2), interval cylinder (16), inner second air pipe (3) and outer second air pipe (5) are from inside to outside successively
It is set in together, forms First air channel between central tube (1) and primary air piping (2), be spaced cylinder (16), inner second air pipe (3)
It is both adjacent with outer second air pipe (5) to sequentially form inner second air channel and outer second air channel from inside to outside, it is spaced cylinder (16)
Both ends pass through annular slab and primary air piping (2) affixed formation enclosure space respectively, primary air piping (2), inner second air pipe (3) and
The outlet end of outer second air pipe (5), which corresponds, is equipped with First air flaring (9), inner second air flaring (10) and outer second air flaring
(12), flow spoiler (7) is arranged on the inner wall of the outlet end of primary air piping (2), and inner swirler (13) setting is logical in inner second air
In road, outer swirler (14) is arranged in outer secondary air channel；
Pulverized coal concentrator (6) includes support plate (6-1) and N number of concentration ring (6-2), and N is the integer of 2-5；
It is N number of concentration ring (6-2) diameter be sequentially increased along First air coal dust flow direction, two neighboring concentration ring (6-2) it
Between be arranged in certain distance, N number of concentration ring (6-2) passes through support plate (6-1) and is fixed together, during support plate (6-1) is fixed in
On the outer wall of heart pipe (1), the side setting of N number of concentration ring (6-2) neighbouring central tube (1) outlet；
Flow equalizing ring (8) is arranged on the inner wall of primary air piping (2), and the neighbouring concentration ring (6-2) being relatively large in diameter of flow equalizing ring (8)
Side setting.
10. a kind of outside dense interior light turbulent burner of diameter of multistage air distribution according to claim 9, it is characterised in that: N
A concentration ring (6-2) is circular cone ring, and the taper of N number of concentration ring (6-2) is equal, the bus of each concentration ring (6-2) with
The angle (δ) of the center line of central tube (1) is 20 °~40 °.
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| JP2021173505A (en) * | 2020-04-30 | 2021-11-01 | 株式会社Ihi | Powder fuel burner |
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