CN108413394A - A kind of natural gas premix burner with segmentation slit spout structure - Google Patents
A kind of natural gas premix burner with segmentation slit spout structure Download PDFInfo
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- CN108413394A CN108413394A CN201810299442.9A CN201810299442A CN108413394A CN 108413394 A CN108413394 A CN 108413394A CN 201810299442 A CN201810299442 A CN 201810299442A CN 108413394 A CN108413394 A CN 108413394A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
A kind of natural gas premix burner with segmentation slit spout structure, the present invention relates to a kind of burners of natural gas, and in particular to a kind of natural gas premix burner.It is poor that it solves natural gas premixed combustion flame holding, the problem of being easy to happen tempering, detonation and put out.It includes premixed natural gas pipeline, flaring connecting pipe, jet pipe row, cooling medium inlet header and cooling media outlet header, and multiple rectangular jets are divided into the slit spout of the jet pipe row.It further includes smooth combustion apparatus, the pipe or pipe shape tube that smooth combustion apparatus is arranged in a row by more parallel verticals form, the every pipe or pipe shape tube of the smooth combustion apparatus correspond to jet pipe and arrange the slit spout to be formed, the leeward of the pipe shape tube is plane, the median perpendicular of the plane and slit width of jet direction；The pipe or pipe shape tube lower end are connected to cooling medium inlet header, and the pipe or pipe shape tube upper end are connected to cooling media outlet header.
Description
Technical field
The present invention relates to a kind of burners of natural gas, and in particular to a kind of natural gas premix burner.
Background technology
Natural gas sulfur content is low, calorific value is high, the thermal efficiency is high, is generally recognised as the primary energy of economic environmental protection in the world.Although such as
This, the nitrogen oxides that combustion of natural gas generates is one of the major pollutants in air, can form acid rain and haze, harmful to human
Health and environment.In recent years, country has put into effect a series of discharge of laws and regulations and mandatory standard limitation nitrogen oxides in succession.
《Thermal power plant atmosphere pollutants emission standards》(GB 13223-2011) is to the emission limit of the nitrogen oxides of gas fired-boiler
100mg/m3, on May 13rd, 2015, Beijing issued《Emission standard of air pollutants for boilers》(DB11/139-2015), it advises
Determine from 1 day April in 2017, it is 30mg/m to create gas fired-boiler emission limits of nitrogen oxides3.Country and local regulation are to nitrogen oxygen
Compound emission request is increasingly strict, and the discharged nitrous oxides that combustion of natural gas generates will reach emission request, it is necessary to use low nitrogen
Combustion technology.
Existing natural gas boiler mostly uses diffusion combustion mode, natural gas and air and burns in mixing, spreads mixing
Speed and Process flowchart the speed and process of diffusion combustion.Gas diffusion combustion flame stability is good, is not tempered, but
Discharged nitrous oxides are higher, and 80mg/m can be reduced to using discharged nitrous oxides after grading combustion technology3.Control nitrogen oxidation
Object is emitted on 30mg/m3Hereinafter, flue gas recirculating technique must be used simultaneously, cost is higher.Fractional combustion and flue gas recirculation
Technology can make burning tend to be unstable, increase incomplete combustion loss and boiler exhaust gas heat loss.
Natural gas premixed combustion technology is a kind of low-NO_x combustion technology, and natural gas and air fill by a certain percentage before combustion
Divide mixing, compared to diffusion combustion, the efficiency of combustion higher of premixed combustion, discharged nitrous oxides are lower under same reaction conditions, can
It is less than 30mg/m to meet discharged nitrous oxides3Requirement.Industrial burner exports pre-mixing gas combustion speed and is generally far above fire
Flame propagation velocity is easy to happen de- fire, puts out, and is easy to happen tempering, detonation in igniting, blowing out and underload.
Invention content
The object of the present invention is to provide a kind of natural gas premix burners with segmentation slit spout structure, to solve day
Right gas premixed combustion flame holding is poor, the problem of being easy to happen tempering, detonation and put out.
To achieve the above object, the technical solution adopted by the present invention is that：It includes premixed natural gas pipeline 1, flaring connection
Pipeline 2, jet pipe row 3, cooling medium inlet header 4 and cooling media outlet header 5, the jet pipe row 3 are parallel perpendicular by N roots
In line flat oval pipe in a row or pipe composition with parallel side rib, the lower end of flat oval pipe or pipe and cooling medium inlet
Header 4 is connected to, and the upper end of flat oval pipe or pipe is connected to cooling media outlet header 5, and the jet pipe row 3 is arranged in flaring
In 2 air outlet of connecting pipe, the side rib of N root flat oval pipes or N root pipes forms N-1 slit spout；The jet pipe row 3
Each slit spout in the multiple rectangular metal sheets 7 of welding, the rectangular metal sheet 7 on slit spout direction equidistantly
Jet pipe, is arranged the slit spout to be formed and is divided into multiple rectangular jets by setting.
It further includes smooth combustion apparatus 6, the pipe or pipe shape tube that smooth combustion apparatus 6 is arranged in a row by N-1 root parallel verticals
Composition, the every pipe or pipe shape tube of the smooth combustion apparatus 6 correspond to the slit spout that jet pipe row 3 is formed, described
The diametric extended line of the circumscribed circle of pipe or pipe shape tube is overlapped with the center line in slit width of jet direction, the circle
The leeward of pipe shape tube is plane, the median perpendicular of the plane and slit width of jet direction；The pipe or pipe are special-shaped
Pipe lower end is connected to cooling medium inlet header 4, and the pipe or pipe shape tube upper end connect with cooling media outlet header 5
It is logical.
The advantageous effect of the present invention compared with the existing technology is：Jet pipe mining water cooling or air-cooled flat oval pipe or band
The pipe of parallel side rib, jet pipe arrange the quenching distance that the slit width of jet to be formed is less than premixed natural gas burning, can be to prevent
Only tempering, detonation occur for premixed natural gas.Slit spout is divided into multiple rectangular jets by the present invention, and the height for reducing jet stream is wide
Than improving the rigidity of jet stream, while improving the uniformity of the uniformity and burning of slit spout Velocity Profiles, reducing combustion
The Thermal load of cross-section in burner area, is conducive to low nitrogen burning.Premixed natural gas is after the slit spout of over-segmentation, the steady flame device of flow-disturbing
Pipe or pipe shape tube pipe row, due to the effect of gas viscosity power, stream is formed about in pipe or pipe abnormal shape pipe outer wall
Moving boundary layer generates the lower region of air velocity, meets the condition for stablizing burning, while pipe or pipe shape tube leeward
Airflow reflux area is formed, can roll up and inhale high-temperature flue gas heating pre-mixing gas combustion, further enhance the stability of burning.Using pipe
Shape tube, leeward is plane can form the airflow reflux area of bigger in leeward, further enhance compared to pipe
The stability of burning.Pipe or pipe shape tube use water cooling or air-cooled, it is ensured that the temperature of combustion zone is no more than 1500
DEG C, realize low-nitrogen oxide discharging.
The applicable load range of the natural gas premix burner of the present invention is wide, can ensure burning under 12%-100% loads
Stablize, be not tempered and put out, the discharged nitrous oxides of natural gas premix burner are less than 30mg/m3, minimum reachable 10mg/
m3, burner resistance is small, has a good application prospect.
Description of the drawings
Fig. 1 is schematic structural view of the invention, and Fig. 2 is the A-A sectional views of Fig. 1, and Fig. 3 is the B-B sectional views of Fig. 1, and Fig. 4 is this
The principle schematic of invention combustion process.Fig. 5 is the structural schematic diagram of embodiment two, and Fig. 6 is the schematic diagram of embodiment three,
Fig. 7 is the M-M sectional views of Fig. 6.
Specific implementation mode
Specific implementation mode one：Present embodiment is illustrated with reference to Fig. 1 to Fig. 4.Present embodiment includes premix
Natural gas line 1, flaring connecting pipe 2, jet pipe row 3, cooling medium inlet header 4 and cooling media outlet header 5, it is described
The pipe for the parallel side rib of band that jet pipe row 3 is arranged in a row by N root parallel verticals forms.The pipe outer diameter of the parallel side rib of the band
Parallel side rib for 18-32mm, the pipe is contour with pipe and is arranged symmetrically, the midpoint of parallel side rib inner wall and circular tube external wall
The thickness of connection, parallel side rib is 1-3mm, and the length Y of parallel side rib is equal with pipe outer diameter.The lower end of the pipe and cooling
Medium inlet header 4 is connected to, and the upper end of the pipe is connected to cooling media outlet header 5, and the jet pipe row 3 is arranged in gradually
Expand in 2 air outlet of connecting pipe；The jet pipe row height is 300-1500mm, selects N for 5-40 according to burner rating；
The parallel sides rib of N root pipes forms N-1 slit spout；The slit width of jet b is 1.0-2.0mm；The jet pipe row 3
Each slit spout in the multiple rectangular metal sheets 7 of welding, the height g of rectangular metal sheet 7 is 3-4mm, and thickness is equal to slit spray
Mouth width degree, width are equal to slit spout depth.Rectangular metal sheet 7 in each slit spout is equidistantly set in the height direction
It sets.Jet pipe is arranged the slit spout to be formed and is divided into multiple rectangular jets by rectangular metal sheet 7, and rectangular jet height f is 20-
The premixed natural gas muzzle velocity of 40mm, slit spout are 4-32m/s.Slit spout is divided into multiple rectangular jets, is reduced
The depth-width ratio of jet stream, improves the rigidity of jet stream, while improving uniformity and the burning of slit spout Velocity Profiles
Uniformity reduces the Thermal load of cross-section of burner region, is conducive to low nitrogen burning.
It further includes smooth combustion apparatus 6, the pipe or pipe shape tube that smooth combustion apparatus 6 is arranged in a row by N-1 root parallel verticals
Composition, the every pipe or pipe shape tube of the smooth combustion apparatus 6 correspond to the slit spout that jet pipe row 3 is formed, described
The diametric extended line of the circumscribed circle of pipe or pipe shape tube is overlapped with the center line in slit width of jet direction；It is described steady
The pipe outer diameter for firing device 6 is 16-32mm, and the leeward of the pipe shape tube of the smooth combustion apparatus 6 is plane, the plane with it is narrow
The median perpendicular in width of jet direction is stitched, the circumscribed circle diameter of the pipe shape tube of the smooth combustion apparatus 6 is 16-32mm, pipe
The planar outer walls 6-1 of shape tube is away from 0-2/3 times of circumradius that pipe circle center distance is pipe shape tube.Premixed natural gas
The pipe or pipe shape tube pipe of the steady flame device of flow-disturbing are arranged, due to the effect of gas viscosity power, outside pipe or pipe shape tube
Wall is formed about flow boundary layer, generates the lower region of air velocity, meets the condition for stablizing burning, while pipe or pipe
Shape tube leeward forms airflow reflux area, can roll up and inhale high-temperature flue gas heating pre-mixing gas combustion, further enhance the steady of burning
It is qualitative.Using pipe shape tube, leeward is plane can form the airflow reflux of bigger compared to pipe in leeward
Area further enhances the stability of burning.
The outside wall surface minimum spacing e of pipe or pipe shape tube the pipe row of the smooth combustion apparatus 6 are 3-8mm.Smooth combustion apparatus 6
Pipe or pipe shape tube windward side outside wall surface endpoint away from slit spout outlet distance c be 5-9mm.
The pipe of the smooth combustion apparatus 6 or pipe shape tube lower end are connected to cooling medium inlet header 4, the pipe or
Pipe shape tube upper end is connected to cooling media outlet header 5.Cooling medium enters jet pipe through cooling medium inlet header 4 and arranges
3 pipe and the pipe of smooth combustion apparatus 6 or pipe shape tube are drawn by cooling media outlet header 5.It is when cooling down medium with water
The in-pipe flow speed of jet pipe row 3 and the in-pipe flow speed of smooth combustion apparatus 6 are 0.3m/s to 1.5m/s, are cooling medium with air
When jet pipe row 3 velocity in pipes and smooth combustion apparatus 6 velocity in pipes be 15m/s to 50m/s.Cooling medium is outer circulation, is used
Come heating boiler feed water or external heat supply.
Specific implementation mode two：Present embodiment is illustrated with reference to Fig. 5.Present embodiment and embodiment one
It is a difference in that：The flat oval pipe that the jet pipe row 3 is arranged in a row by N root parallel verticals forms.Outside the flat oval pipe
Wall profile is made of 2 arc sections and 2 straight sections, and the straight section length of flat oval pipe is 20-30mm, flat oval pipe width (2 straight sections
Outer wall between distance) be 20-38mm.The lower end of the flat oval pipe is connected to cooling medium inlet header 4, the flat oval pipe
Upper end be connected to cooling media outlet header 5.Flat oval pipe is easily fabricated, and cost is relatively low, to the cooling effect of slit spout
It is good.
The pipe of the smooth combustion apparatus 6 or the arc section outside wall surface of pipe shape tube windward side outside wall surface anomaly elliptical tube
Minimum range w is 3-5mm.
Specific implementation mode three：Present embodiment is illustrated with reference to Fig. 6 and Fig. 7.Present embodiment and embodiment party
Formula two is a difference in that：It further includes circumferential rib 16, on each pipe of smooth combustion apparatus 6 or the outer surface of pipe shape tube
Multiple circumferential ribs 16 are set, and thickness direction intermediate cross-section and the rectangular metal sheet 7 of each circumferential rib 16 are divided slit spout and formed
Rectangular jet short transverse intermediate cross-section in same plane.The fin height 2-3mm of circumferential rib 16, fin thickness 2-3mm.
Since each circumferential rib 16 is against the intermediate cross-section of rectangular jet short transverse, flame impingement circumferential rib 16, ring
Shape rib can strengthen the heat exchange of the pipe or pipe shape tube of smooth combustion apparatus 6, reduce the temperature of flame.Because gas viscosity is in ring
The near wall of shape rib forms flow boundary layer, and air velocity is low, is conducive to surely fire.
Embodiment 1：
As shown in Figs. 1-3, present embodiment include premixed natural gas pipeline 1, flaring connecting pipe 2, jet pipe row 3, it is cold
But medium inlet header 4 and cooling media outlet header 5, the band that the jet pipe row 3 is arranged in a row by 15 parallel verticals are put down
The pipe of row side rib forms.The pipe outer diameter of the parallel side rib of the band is 22mm, and the parallel side rib of the pipe is arranged symmetrically, side
The midpoint of rib inner wall is connect with circular tube external wall, and the thickness of side rib is 1.5mm, and the length Y of side rib is 22mm.The lower end of the pipe
It is connected to cooling medium inlet header 4, the upper end of the pipe is connected to cooling media outlet header 5, and the jet pipe arranges 3 rows
Cloth is in 2 air outlet of flaring connecting pipe；The jet pipe row height is 676mm；The side rib formation 14 of 15 pipes is narrow
Stitch spout；The slit width of jet b is 1.5mm；In each slit spout of jet pipe row 3 throat thickness be 1.5mm,
19 rectangular metal sheets 7 that width is 22mm, height g is 4mm, rectangular metal sheet 7 are equidistantly set in slit spout direction
It sets, jet pipe is arranged each slit spout to be formed and is divided into 20 rectangular jets by rectangular metal sheet 7, and rectangular jet height f is
The premixed natural gas muzzle velocity of 30mm, slit spout are 4-32m/s.Slit spout, which is divided into multiple rectangular jets, to drop
The low depth-width ratio of jet stream, improves the rigidity of jet stream, while improving uniformity and the burning of slit spout Velocity Profiles
Uniformity, reduce the Thermal load of cross-section of burner region, be conducive to low nitrogen burning.
It further includes smooth combustion apparatus 6, and the pipe that smooth combustion apparatus 6 is arranged in a row by 14 parallel verticals forms, the steady combustion
Every pipe of device 6 corresponds to the slit spout that jet pipe row 3 is formed, and the pipe of the smooth combustion apparatus 6 is diametric
Extended line is overlapped with the center line in slit width of jet direction；The outer diameter of the pipe of the smooth combustion apparatus 6 is 22mm, the steady combustion dress
The outside wall surface minimum spacing e for setting 6 circular pipe pipe row is 4.5mm.The windward side outside wall surface endpoint of the pipe of the smooth combustion apparatus 6 away from
Slit spout outlet distance c is 5mm.
The pipe lower end of the smooth combustion apparatus 6 is connected to cooling medium inlet header 4, on the pipe of the smooth combustion apparatus 6
End is connected to cooling media outlet header 5.Cooling medium enters the pipe of jet pipe row 3 and steady through cooling medium inlet header 4
The pipe for firing device 6 is drawn by cooling media outlet header 5.When with water being cooling medium the in-pipe flow speed of jet pipe row 3 and
The in-pipe flow speed of smooth combustion apparatus 6 is 1m/s, and cooling medium is outer circulation, is used for heating boiler feed water.
The circular pipe pipe row of the steady flame device of premixed natural gas flow-disturbing in the present embodiment, due to the effect of gas viscosity power, in circle
Pipe outer wall is formed about flow boundary layer, generates the lower region of air velocity, meets the condition for stablizing burning, while pipe is carried on the back
Wind face forms airflow reflux area, can roll up and inhale high-temperature flue gas heating pre-mixing gas combustion, further enhance the stability of burning.Spout
It is the parameter that 1.5mm is optimization that pipe, which arranges the slit width of jet b to be formed, and slit width of jet is too small, the requirement to manufacture processing
Higher, the effluxvelocity higher of slit spout under identical gas quantity can increase combustion noise, and slit width of jet crosses conference increasing
The possibility that premixed natural gas is tempered is added.The burner may be implemented to stablize burning under 12%-100% loads, not send out
Raw tempering is put out, discharged nitrous oxides 16-28mg/m3。
Embodiment 2：
The present embodiment and embodiment 1 to differ only in the pipe that smooth combustion apparatus 6 is arranged in a row by 14 parallel verticals different
Type pipe forms, and every pipe shape tube of the smooth combustion apparatus 6 corresponds to the slit spout that jet pipe row 3 is formed, described steady
The extended line for firing the circumscribed circle diameter direction of the pipe shape tube of device 6 is overlapped with the center line in slit width of jet direction；It is described
The leeward of pipe shape tube be plane, the median perpendicular of the plane and slit width of jet direction, the pipe shape tube
Circumscribed circle outer diameter is 22mm, and the planar outer walls 6-1 of pipe shape tube is 8mm away from pipe circle center distance.The pipe shape tube pipe
The outside wall surface minimum spacing e of row is 4.5mm, and the windward side outside wall surface endpoint of the pipe shape tube is away from slit spout outlet distance
C is 5mm.
The pipe shape tube lower end of the smooth combustion apparatus 6 is connected to cooling medium inlet header 4, the pipe shape tube
Upper end is connected to cooling media outlet header 5.Cooling medium through cooling medium inlet header 4 enter jet pipe row 3 pipe and
The pipe shape tube of smooth combustion apparatus 6 is drawn by cooling media outlet header 5.With the pipe that water is smooth combustion apparatus 6 when cooling down medium
The in-pipe flow speed of shape tube is 1m/s.
The pipe shape tube pipe row of the steady flame device of premixed natural gas flow-disturbing in the present embodiment, due to the work of gas viscosity power
With being formed about flow boundary layer in pipe abnormal shape pipe outer wall, generate the lower region of air velocity, meet the item for stablizing burning
Part, while the leeward of pipe shape tube can form the airflow reflux area of bigger compared to pipe for plane in leeward,
Further enhance the stability of burning.The burner may be implemented to stablize burning under 12%-100% loads, not occur back
Fire is put out, discharged nitrous oxides 14-26mg/m3。
Embodiment 3：
The flat oval pipe for differing only in jet pipe row 3 and being arranged in a row by N root parallel verticals of the present embodiment and embodiment 1
Composition, the outer wall profile of the flat oval pipe are made of 2 arc sections and 2 straight sections, and the straight section length of flat oval pipe is 20mm,
Flat oval pipe width (distance between the outer wall of 2 straight sections) is 25mm, and the width for the slit spout that flat oval pipe straight section outer wall is formed is
1.5mm.The lower end of the flat oval pipe is connected to cooling medium inlet header 4, the upper end of the flat oval pipe and cooling medium
Outlet header 5 is connected to, the minimum of the arc section outside wall surface of the windward side outside wall surface anomaly elliptical tube of the pipe of the smooth combustion apparatus 6
Distance w is 4mm.
Jet pipe mining flat oval pipe in the present embodiment, easy to manufacture, cost is relatively low, to the cold of slit spout
But effect is good.The burner may be implemented to stablize burning under 12%-100% loads, and tempering does not occur and puts out, nitrogen oxides row
It puts as 13-25mg/m3。
Embodiment 4：
As shown in figure 5, what the difference of the present embodiment and embodiment 2 was only arranged in a row in jet pipe row 3 by N root parallel verticals
Flat oval pipe forms, and the outer wall profile of the flat oval pipe is made of 2 arc sections and 2 straight sections, and the straight section of flat oval pipe is long
Degree is 20mm, and flat oval pipe width (distance between the outer wall of 2 straight sections) is 25mm, the slit spout that flat oval pipe straight section outer wall is formed
Width be 1.5mm.The lower end of the flat oval pipe be connected to cooling medium inlet header 4, the upper end of the flat oval pipe and
Cooling media outlet header 5 is connected to, the circular arc of the windward side outside wall surface anomaly elliptical tube of the pipe shape tube of the smooth combustion apparatus 6
The minimum range w of section outside wall surface is 4mm.
Jet pipe mining flat oval pipe in the present embodiment, easy to manufacture, cost is relatively low, to the cold of slit spout
But effect is good.The burner may be implemented to stablize burning under 12%-100% loads, and tempering does not occur and puts out, nitrogen oxides row
It puts as 12-24mg/m3。
Embodiment 5：
As shown in Figure 6 and Figure 7, each pipe shape tube for differing only in smooth combustion apparatus 6 of the present embodiment and embodiment 4
Multiple circumferential ribs 16 are all set on outer surface, and intermediate cross-section and the rectangular metal sheet 7 of 16 thickness direction of each circumferential rib are divided narrow
The intermediate cross-section for the rectangular jet short transverse that spout is formed is stitched in same plane.The fin height 3mm of circumferential rib 16, fin are thick
Spend 2mm.
Multiple circumferential ribs 16 are set on each pipe abnormal shape tube outer surface of smooth combustion apparatus in the present embodiment, against jet pipe
Row and rectangular metal sheet formed rectangular jet center, flame impingement circumferential rib 16 can enhanced heat exchange, reduce flame
Temperature.Simultaneously because gas viscosity ring rib is formed about flow boundary layer, air velocity is low, is conducive to surely fire.The burner exists
It may be implemented to stablize burning under 12%-100% loads, tempering do not occur and puts out, discharged nitrous oxides 10-18mg/m3。
Embodiment 6：
The present embodiment and the cooling medium that differs only in of embodiment 1 are air, and air is situated between after being pressurizeed by wind turbine by cooling
Matter entrance header 4 flows through the pipe of the pipe and smooth combustion apparatus 6 of the parallel side rib of band of jet pipe row 3, by cooling media outlet collection
Case 5 is drawn, and the velocity in pipes of jet pipe row 3 and the pipe velocity in pipes of smooth combustion apparatus 6 are 40m/s.
The pipe of jet pipe row and the pipe overpressure of smooth combustion apparatus are relatively low when the present embodiment uses air cooling, flowing
Resistance is small, and there is no in-tube fouling problems caused by using water cooling possible.The burner can be real under 12%-100% loads
Now stablize burning, tempering does not occur and puts out, discharged nitrous oxides 20-30mg/m3。
Claims (10)
1. a kind of natural gas premix burner with segmentation slit spout structure, it includes premixed natural gas pipeline (1), flaring
Connecting pipe (2), jet pipe row (3), cooling medium inlet header (4) and cooling media outlet header (5), the jet pipe row
(3) pipe or flat oval pipe for the parallel side rib of band being arranged in a row by N root parallel verticals form, the pipe or flat oval pipe
Lower end is connected to cooling medium inlet header (4), and the upper end of the pipe or flat oval pipe connects with cooling media outlet header (5)
Logical, the jet pipe row (3) is arranged in flaring connecting pipe (2) air outlet, the side rib or N root flat oval pipes of N root pipes
Form N-1 slit spout；The multiple rectangular metal sheets (7) of welding, the square in each slit spout of the jet pipe row (3)
Shape sheet metal (7) spaced set in the short transverse of slit spout, jet pipe is arranged the slit spout to be formed be divided into it is more
A rectangular jet.
It is characterized in that it further includes smooth combustion apparatus (6), pipe that smooth combustion apparatus (6) is arranged in a row by N-1 root parallel verticals or
Pipe shape tube forms, and the every pipe or pipe shape tube of the smooth combustion apparatus (6) correspond to one that jet pipe row (3) is formed
In the diametric extended line of the circumscribed circle of slit spout, the pipe or pipe shape tube and slit width of jet direction
Line overlaps；The leeward of the pipe shape tube is plane, the median perpendicular of the plane and slit width of jet direction；The circle
Pipe or pipe shape tube lower end are connected to cooling medium inlet header (4), and the pipe or pipe shape tube upper end are situated between with cooling
Matter outlet header (5) is connected to.
2. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
It is equal in the pipe or pipe shape tube height of jet pipe row height and smooth combustion apparatus (6), it is 300-1500mm, N 5-
40；The slit width of jet b is 1.0-2.0mm；The height g of the rectangular metal sheet (7) is 3-4mm, and thickness is equal to slit
Width of jet, width are equal to slit spout depth；Jet pipe is arranged the slit spout to be formed and is divided by the rectangular metal sheet (7)
Multiple rectangular jets, rectangular jet height f are 20-40mm.
3. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
Pipe outer diameter is 18-32mm among arranging the pipe of the parallel side rib of band of (3) in the jet pipe；The parallel side rib of the pipe with
Pipe is contour and is arranged symmetrically, and the midpoint of parallel side rib inner wall is connect with circular tube external wall, and the thickness of parallel side rib is 1-3mm, is put down
The length Y of row side rib is equal with pipe outer diameter；The pipe of the smooth combustion apparatus (6) or the windward side outside wall surface end of pipe shape tube
Point is 5-9mm away from slit spout outlet distance c.
4. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
The outer wall profile that the flat oval pipe of (3) is arranged in the jet pipe is made of 2 arc sections and 2 straight sections, the straight section of flat oval pipe
Length is 20-30mm, and flat oval pipe width is 20-38mm；The pipe of the smooth combustion apparatus (6) or the windward side of pipe shape tube
The minimum range w of the arc section outside wall surface of outside wall surface anomaly elliptical tube is 3-5mm.
5. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
It is 16-32mm in the outer diameter of the pipe of the smooth combustion apparatus (6), the outside wall surface minimum spacing e of the circular pipe pipe row is 3-8mm.
6. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
In the smooth combustion apparatus (6) pipe shape tube circumscribed circle diameter be 16-32mm, the planar outer walls (6-1) of pipe shape tube
0-2/3 times away from the circumradius that pipe circle center distance is pipe shape tube, the outside wall surface of the pipe shape tube pipe row is most
Small spacing e is 3-8mm.
7. a kind of natural gas premix burner with segmentation slit spout structure according to claim 2, feature exist
It is 1.5mm in the slit width of jet b, the height g of the rectangular metal sheet (7) is 4mm, thickness 1.5mm, and width is equal to
Jet pipe is arranged the slit spout to be formed and is divided into multiple rectangular jets, rectangle by slit spout depth, the rectangular metal sheet (7)
Spout f is 30mm.
8. a kind of natural gas premix burner with segmentation slit spout structure according to claim 3, feature exist
It is 22mm in the pipe outer diameter, the parallel side rib of the pipe is contour with pipe and is arranged symmetrically, in parallel side rib inner wall
Point is connect with circular tube external wall, and the thickness of parallel side rib is 1.5mm, and the length Y of parallel side rib is 22mm.
9. a kind of natural gas premix burner with segmentation slit spout structure according to claim 6, feature exist
It is 22mm in the circumscribed circle diameter of the pipe shape tube, the planar outer walls (6-1) of the pipe shape tube are different away from the pipe
The distance in the circumscribed circle center of circle of type pipe is 8mm.
10. a kind of natural gas premix burner with segmentation slit spout structure according to claim 1, feature exist
Further include circumferential rib (16) in it, multiple rings are arranged in each pipe or pipe abnormal shape tube outer surface of the smooth combustion apparatus (6)
Shape rib (16), intermediate cross-section and rectangular metal sheet (7) the segmentation slit spout formation of the thickness direction of each circumferential rib (16)
The intermediate cross-section of the short transverse of rectangular jet is in the same plane；The fin height 2-3mm of circumferential rib (16), fin thickness 2-
3mm。
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| CN109297019A (en) * | 2018-09-13 | 2019-02-01 | 西安交通大学 | A kind of air suspended type fire row combustor with cylindrical fire face |
| CN110360568A (en) * | 2019-08-23 | 2019-10-22 | 北京泷涛环境科技有限公司 | A kind of low nitrogen combustion apparatus and method |
| CN110822426A (en) * | 2019-11-11 | 2020-02-21 | 西安交通大学 | Variation micro-channel cooling type surface flame low NOx gas device |
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