CN107906514B - Flat flame low-nitrogen burner - Google Patents
Flat flame low-nitrogen burner Download PDFInfo
- Publication number
- CN107906514B CN107906514B CN201711263341.8A CN201711263341A CN107906514B CN 107906514 B CN107906514 B CN 107906514B CN 201711263341 A CN201711263341 A CN 201711263341A CN 107906514 B CN107906514 B CN 107906514B
- Authority
- CN
- China
- Prior art keywords
- air
- air pipe
- pipe
- gas
- flat flame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 51
- 239000011449 brick Substances 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 230000004323 axial length Effects 0.000 claims description 3
- 239000002737 fuel gas Substances 0.000 abstract description 22
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- F23D14/64—Mixing devices; Mixing tubes with injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pre-Mixing And Non-Premixing Gas Burner (AREA)
Abstract
The invention discloses a flat flame low nitrogen burner, which comprises a gas pipe for outputting gas: an air pipe outputting air; the gas pipe is nested in the air pipe, and a plurality of swirl plates are annularly arranged on the inner ring of the gas pipe; the swirl plate is provided with a helix angle; the injection end annular array of the air pipe is provided with a plurality of guide holes; the air pipe is connected with an inlet, the direction of the inlet is perpendicular to the direction of the axis of the air pipe, and the projection of the inlet along the normal direction of the air pipe is positioned on one side of the axis of the air pipe. The injection end of the air pipe and the gas pipe is connected with an opening brick, and the diameter of an opening inner cavity of the opening brick is gradually increased along the gas injection direction. In the axial section of the open brick, the contour generatrix of the open inner cavity is parabolic. The helix angle of the swirl plate is 45 deg.. The invention ensures that the air and the fuel gas move spirally before being sprayed, is convenient for uniform mixing and full combustion after being sprayed, and simultaneously increases the radial width of the flame to generate flat flame.
Description
Technical Field
The invention relates to the field of combustors, in particular to a flat flame low-nitrogen combustor.
Background
The heat treatment requires precise temperature consistency and is particularly difficult to achieve on large kilns. The method has certain difficulty in obtaining flat flame, and the fuel gas and air have higher injection pressure, so that the flame is axially longer due to higher injection speed.
Disclosure of Invention
The invention aims to solve the problem of providing a flat flame low-nitrogen burner, which ensures that air and fuel gas move spirally before being sprayed, so that the air and the fuel gas are convenient to mix uniformly after being sprayed and burn fully, and simultaneously the radial width of flame is increased to generate flat flame.
In order to solve the above problems, the present invention provides a flat flame low nitrogen burner, and in order to achieve the above objects, the technical solution adopted by the present invention for solving the technical problems is as follows:
a flat flame low nitrogen burner comprising: a gas pipe for outputting gas: an air pipe outputting air; the gas pipe is nested in the air pipe, and a plurality of swirl plates are annularly arranged on the inner ring of the gas pipe; the swirl plate is provided with a helix angle; the injection end annular array of the air pipe is provided with a plurality of guide holes; the air pipe is connected with an inlet, the direction of the inlet is perpendicular to the direction of the axis of the air pipe, and the projection of the inlet along the normal direction of the air pipe is positioned on one side of the axis of the air pipe.
The beneficial effects of adopting above-mentioned technical scheme are: before the air and the fuel gas are sprayed out of the pipeline, the air and the fuel gas move in a spiral mode, the spiral directions are the same, and when the air is sprayed out of the air pipe and the fuel gas is sprayed out of the fuel gas pipe, the air and the fuel gas collide with each other, are wound and mixed, are fully mixed and are fully combusted. Also because air and gas all possess the rotatory partial velocity of circumference, so flame after mixing is wanting to spread all around easily because of centrifugal force, and the width of flame widens, satisfies the operation needs.
As a further improvement of the invention, the injection end of the air pipe and the gas pipe is connected with an opening brick, and the diameter of the opening inner cavity of the opening brick is gradually increased along the gas injection direction.
The beneficial effects of adopting above-mentioned technical scheme are: the horn-shaped opening bricks can change the shape of the flame, so that the flame is rapidly spread along the periphery in the radial direction.
As a further development of the invention, the contour generatrix of the open cavity is parabolic in an axial section of the open brick.
The beneficial effects of adopting above-mentioned technical scheme are: the parabolic shape further enables the flame grand to spread rapidly, and finally a flat flame is formed. As the flame spreads out rapidly, the flame flow rate decreases and nitrogen oxides are produced less.
As a further development of the invention, the outlet end of the gas pipe is fixedly connected to an air guide plate, the diameter of which is smaller than the inner diameter of the gas pipe.
The beneficial effects of adopting above-mentioned technical scheme are: the air guide plate is in a disc shape, the main plane of the air guide plate is perpendicular to the axial direction of the air pipe, a certain blocking guide effect is achieved on air, the air is pushed to move radially, the air guide plate can fix the gas pipe, and the spatial position of the gas pipe is guaranteed.
As a further improvement of the present invention, the air guide plate and the air tube outlet end are provided with a gap in the axial direction.
The beneficial effects of adopting above-mentioned technical scheme are: the air can diffuse radially along the gap, facilitating the formation of a flat flame. Air may be swirled into the combustion chamber, with only a portion of the air flowing through the air guide plate holes.
As a further improvement of the invention, the guide holes are round holes, and the guide holes are positioned on the air guide plate; the axial projections of the guide holes are all contained within the axial projections of the open cavities of the open bricks.
The beneficial effects of adopting above-mentioned technical scheme are: the round hole-shaped guide holes are convenient for air to be discharged, the guide holes are arranged on the air guide plate to just save the material of the air guide plate, and air and fuel gas can enter the inner cavity of the opening to spread the flame.
As a further improvement of the invention, the radial height of the cyclone sheet is 20mm, the axial length is 100mm, and the thickness is 3mm.
The beneficial effects of adopting above-mentioned technical scheme are: the length and the width of the cyclone sheet enable the gas to generate better cyclone effect, and the conveying resistance of too much gas is not generated, and the strength of the cyclone sheet with the thickness of 3mm is enough.
As a still further improvement of the present invention, the helix angle of the swirl plate is 45 °.
The beneficial effects of adopting above-mentioned technical scheme are: the included angle of 45 degrees enables the fuel gas and the air to perform better spiral motion, and the circumferential rotation and the axial speed are proper.
As a still further development of the invention, the inlet opening is semi-circular in shape.
The beneficial effects of adopting above-mentioned technical scheme are: the semicircular inlet port makes the entering gas all get into from the axis one side of the pipe that gets into, because the self velocity reason of entering gas makes the back of getting into, along the rotatory helical motion of body inner wall. The semicircular inlet is provided with a larger opening area under the spiral condition, so that gas is smoothly conveyed.
As a further improvement of the invention, the semicircle is formed by a semicircle arc and a line segment, the projection of the line segment along the normal direction of the inlet is overlapped with the self axis of the air pipe, and the radius of the semicircle is equal to the radius of the air pipe.
The beneficial effects of adopting above-mentioned technical scheme are: the semicircular inlet area reaches the maximum, and the gas is smoothly transmitted.
As a still further improvement of the present invention, the number of the swirl plates and the number of the guide holes are not equal.
The beneficial effects of adopting above-mentioned technical scheme are: the fuel gas entering the cyclone sheet and the air emitted from the air pipe are not completely distributed in the same circumferential direction, so that the fuel gas and the air are mixed more fully.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of one embodiment of the present invention;
FIG. 2 is a perspective view of another embodiment of the present invention;
FIG. 3 is a perspective view of another embodiment of the present invention;
FIG. 4 is a cross-sectional view of another embodiment of the present invention;
FIG. 5 is a perspective view of another embodiment of the present invention;
FIG. 6 is a perspective view of another embodiment of the present invention;
fig. 7 is a cross-sectional view of another embodiment of the present invention.
1-a guide hole; 2-gas pipes; 3-entry port; 4-cyclone sheets; 5-an air guide plate; 6-opening bricks; 7-an air tube; 8-gap.
Detailed Description
The following describes the present invention in further detail with reference to specific examples:
in order to achieve the object of the present invention, a flat flame low nitrogen burner comprises: gas pipe 2 for outputting gas: an air pipe 7 for outputting air; the gas pipe 2 is nested in the air pipe 7, and a plurality of swirl plates 4 are annularly arranged at the inner ring of the gas pipe 2; the swirl plate 4 has a helix angle; the injection end annular array of the air pipe 7 is provided with a plurality of guide holes 1; the air pipe 7 is connected with an inlet 3, the direction of the inlet 3 is perpendicular to the axis direction of the air pipe 7, and the projection of the inlet 3 along the normal direction of the air pipe 7 is positioned on one side of the axis of the air pipe 7.
The swirl plate 4 is spatially twisted and the air tube 7 is a straight tube. The air pipe 7 is located outside the gas pipe 2. Air is transferred in the space between the outer ring of the gas pipe 2 and the inner ring of the air pipe 7.
The beneficial effects of adopting above-mentioned technical scheme are: before the air and the fuel gas are sprayed out of the pipeline, the air and the fuel gas move in a spiral mode, the spiral directions are the same, and when the air is sprayed out of the air pipe and the fuel gas is sprayed out of the fuel gas pipe, the air and the fuel gas collide with each other, are wound and mixed, are fully mixed and are fully combusted. Also because air and gas all possess the rotatory partial velocity of circumference, so flame after mixing is wanting to spread all around easily because of centrifugal force, and the width of flame widens, satisfies the operation needs. The air entering from the inlet port can spiral in the air tube due to the tangential force.
In other embodiments of the present invention, the outlet ends of the air pipe 7 and the gas pipe 3 are connected with the opening brick 6, and the diameter of the opening cavity of the opening brick 6 gradually increases along the gas outlet direction.
The beneficial effects of adopting above-mentioned technical scheme are: the horn-shaped opening bricks can change the shape of the flame, so that the flame is rapidly spread along the periphery in the radial direction.
In other embodiments of the invention, as shown in fig. 4, the profile generatrix of the open cavity is parabolic in an axial cross-sectional view of the open brick 6.
I.e. along the gas emission direction, the diameter of the opening inner cavity is increased more and more in each unit distance, and the opening inner cavity is in a horn shape.
The beneficial effects of adopting above-mentioned technical scheme are: the parabolic shape further enables the flame grand to spread rapidly, and finally a flat flame is formed. As the flame spreads out rapidly, the flame flow rate decreases and nitrogen oxides are produced less.
In other embodiments of the present invention, as shown in fig. 6, the injection end of the gas pipe 2 is fixedly connected to the air guide plate 5, the air pipe 7 is not fixed to the air guide plate 5, and a gap 8 is formed between the injection end 7 of the air pipe and the air guide plate 5 in the axial direction.
As shown in fig. 6 and 7, the diameter of the air guide plate 5 is smaller than the diameter of the air tube 7.
The beneficial effects of adopting above-mentioned technical scheme are: the air guide plate is in a disc shape, the main plane of the air guide plate is perpendicular to the axial direction of the air pipe, a certain blocking guide effect is achieved on air, the air is pushed to move radially, the air guide plate can fix the gas pipe, and the spatial position of the gas pipe is guaranteed. The air can diffuse radially along the gap, facilitating the formation of a flat flame. Air may be swirled into the combustion chamber, with only a portion of the air flowing through the air guide plate holes. The air guide plates are spatially positioned such that the portion of air moving helically within the air tube continues to move helically and radially along the open brick cavity.
In other embodiments of the invention, the guide holes 1 are circular holes, and the guide holes 1 are positioned on the air guide plate 5; the axial projections of the guide holes 1 are all contained in the axial projections of the open cavities of the open bricks 6.
The beneficial effects of adopting above-mentioned technical scheme are: the round hole-shaped guide holes are convenient for air to be discharged, the guide holes are arranged on the air guide plate to just save the material of the air guide plate, and air and fuel gas can enter the inner cavity of the opening to spread the flame.
In other embodiments of the invention, the swirl plate 4 has a radial height of 20mm, an axial length of 100mm and a thickness of 3mm.
The beneficial effects of adopting above-mentioned technical scheme are: the length and the width of the cyclone sheet enable the gas to generate better cyclone effect, and the conveying resistance of too much gas is not generated, and the strength of the cyclone sheet with the thickness of 3mm is enough.
In other embodiments of the invention, the helix angle of the swirl plate 4 is 45 °.
The beneficial effects of adopting above-mentioned technical scheme are: the included angle of 45 degrees enables the fuel gas and the air to perform better spiral motion, and the circumferential rotation and the axial speed are proper.
In other embodiments of the invention, the inlet opening 3 is semi-circular in shape.
The beneficial effects of adopting above-mentioned technical scheme are: the semicircular inlet port makes the entering gas all get into from the axis one side of the pipe that gets into, because the self velocity reason of entering gas makes the back of getting into, along the rotatory helical motion of body inner wall. The semicircular inlet is provided with a larger opening area under the spiral condition, so that gas is smoothly conveyed.
The semicircular inlet 3 is formed by a semicircular arc and a line segment, the projection of the line segment along the normal direction of the inlet 3 is overlapped with the axis of the air pipe 7 or the gas pipe 2, and the radius of the semicircle is equal to the radius of the air pipe 7.
The beneficial effects of adopting above-mentioned technical scheme are: the semicircular inlet area reaches the maximum, and the gas is smoothly transmitted.
In other embodiments of the invention, the number of swirl vanes 4 is not equal to the number of guide holes 1.
As shown in fig. 5, for example, the number of swirl plates 4 is six, and the number of guide holes 1 is eight.
The beneficial effects of adopting above-mentioned technical scheme are: the fuel gas entering the cyclone sheet and the air ejected from the guide holes are not completely distributed in the same circumferential direction, so that the fuel gas and the air are mixed more fully.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. A flat flame low nitrogen burner comprising:
a gas pipe for outputting gas;
an air pipe outputting air;
the gas pipe is nested in the air pipe, and a plurality of swirl plates are annularly arranged on the inner ring of the gas pipe; the swirl plate is provided with a helix angle; the injection end annular array of the air pipe is provided with a plurality of guide holes; the air pipe is connected with an inlet, the direction of the inlet is perpendicular to the axis direction of the air pipe, and the projection of the inlet along the normal direction of the air pipe is positioned at one side of the axis of the air pipe;
the helix angle of the swirl plate is 45 degrees;
the inlet port is semi-circular in shape.
2. A flat flame low nitrogen burner as claimed in claim 1, wherein: the injection end of the air pipe and the gas pipe is connected with an opening brick, and the diameter of an opening inner cavity of the opening brick is gradually increased along the gas injection direction.
3. A flat flame low nitrogen burner as claimed in claim 2, wherein: in the axial sectional view of the opening brick, the contour generatrix of the opening inner cavity is parabolic.
4. A flat flame low nitrogen burner as claimed in claim 2, wherein: the injection end of the gas pipe is fixedly connected with an air guide plate, and the diameter of the air guide plate is smaller than the inner diameter of the air pipe.
5. The flat flame low nitrogen burner of claim 4, wherein: the air guide plate and the air pipe injection end are axially provided with a gap.
6. The flat flame low nitrogen burner of claim 4, wherein: the guide holes are in round hole shapes and are positioned on the air guide plate; the axial projections of the guide holes are all contained in the axial projections of the opening inner cavities of the opening bricks.
7. A flat flame low nitrogen burner as claimed in claim 1, wherein: the radial height of the swirl plate is 20mm, the axial length is 100mm, and the thickness is 3mm.
8. A flat flame low nitrogen burner as claimed in claim 1, wherein: the semicircular shape is formed by a semicircular arc and a line segment, the projection of the line segment along the normal direction of the inlet is overlapped with the self axis of the air pipe, and the radius of the semicircular shape is equal to the radius of the air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711263341.8A CN107906514B (en) | 2017-12-04 | 2017-12-04 | Flat flame low-nitrogen burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711263341.8A CN107906514B (en) | 2017-12-04 | 2017-12-04 | Flat flame low-nitrogen burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107906514A CN107906514A (en) | 2018-04-13 |
| CN107906514B true CN107906514B (en) | 2024-04-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711263341.8A Active CN107906514B (en) | 2017-12-04 | 2017-12-04 | Flat flame low-nitrogen burner |
Country Status (1)
| Country | Link |
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| CN (1) | CN107906514B (en) |
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| Publication number | Publication date |
|---|---|
| CN107906514A (en) | 2018-04-13 |
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