A low-nitrogen linear burner

Abstract

The present invention provides a low-nitrogen linear burner, which includes a burner body, a combustion-supporting air duct and a flame guard plate. The burner body is provided with a gas passage, a first gas hole, a second gas hole, an inclined premixing hole, an inclined combustion-supporting air hole and a vertical combustion-supporting air hole; the gas passage gradually narrows from the lower part to the upper part. A small part of the gas is ejected through the first gas hole to establish a stable flame on the burner; most of the gas enters the inclined premixing hole through the second gas hole and is premixed with a small amount of combustion-supporting air first. At this time, the gas is in excess, and an incomplete primary combustion is formed on the surface of the burner, with a relatively low temperature; the inclined combustion-supporting air flows out of the inclined combustion-supporting air hole to form an inclined cross-flow of combustion-supporting air, strengthening the mixing with the unburned gas. The vertical combustion-supporting air hole then sends the combustion-supporting air into the periphery of the primary combustion area to completely burn the incompletely burned fuel, forming a secondary combustion, thereby reducing the content of carbon monoxide in the flue gas. The staged combustion makes the temperature in the flame area lower than 1100 °C, effectively reducing the generation of nitrogen oxides in the flue gas.

Description

Technical Field

[0001] The present invention relates to the technical field of low-nitrogen combustion, and specifically to a low-nitrogen linear burner. Background Art

[0002] With the development of society and the improvement of scientific and technological level, the requirements for environmental protection are getting higher and higher, and the requirements for the exhaust gas emissions of industrial burners are also becoming more and more stringent. At present, the emission standards for nitrogen oxides have been greatly reduced. In this case, traditional burners are not suitable for the new requirements and applications under the new standards.

[0003] Since the biggest factor for the generation of nitrogen oxides is the high temperature of the flame, research shows that when the temperature in the flame area exceeds 1100 °C, the content of nitrogen oxides generated by the combustion flue gas will increase sharply. Therefore, the most effective method to reduce nitrogen oxides in the flue gas is to reduce the temperature around the flame and avoid the generation of local high temperatures. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a low-nitrogen linear burner.

[0005] To achieve the above purpose, the technical solution adopted by the present invention to solve its technical problems is: a low-nitrogen linear burner, which includes at least one linear sub-module, and the linear sub-module includes:

[0006] A burner body, on whose base there are a gas channel, a plurality of first gas holes, a plurality of second gas holes, a plurality of inclined premixing holes, a plurality of inclined combustion-supporting air holes and a plurality of vertical combustion-supporting air holes; the gas channel is located in the middle position of the burner body and extends along the length direction, and the gas channel is used to provide fuel for the burner body. Both side surfaces of the gas channel are inclined surfaces, and the gas channel gradually narrows from the lower part to the upper part; the first gas holes extend upward from the middle position at the top of the gas channel through to the upper surface of the burner body; the inclined premixing holes, inclined combustion-supporting air holes and vertical combustion-supporting air holes are all distributed in the base of the burner body on both sides of the gas channel. The inclined premixing holes and inclined combustion-supporting air holes both extend obliquely from the lower surface of the burner body to the middle and penetrate through to the upper surface, and the vertical combustion-supporting air holes extend vertically from the lower surface of the burner body through to the upper surface. The second gas holes extend from the side wall of the gas channel through to the side wall of the inclined premixing holes;

[0007] A combustion-supporting air duct, which is connected to the bottom surface of the burner body, and the combustion-supporting air duct is used to provide combustion-supporting air for the burner body;

[0008] A fire protection plate, which is installed on both sides of the burner body and is higher than the upper surface of the burner body.

[0009] Adopting the technical solution of the present invention, a small part of the gas is ejected through the first gas holes to form a flame in the middle of the burner, which plays a role in connecting the flames and ensures the stable establishment of the flame; most of the gas enters the oblique premixing holes through the second gas holes and is premixed with a small amount of combustion-supporting air first. At this time, the gas is in excess, and an incomplete primary combustion is formed on the surface of the burner, with a relatively low temperature; the combustion-supporting air flowing out of the oblique combustion-supporting air holes forms an obliquely crossed combustion-supporting air, which strengthens the mixing with the unburned gas. The vertical combustion-supporting air holes send the combustion-supporting air into the periphery of the primary combustion area to completely burn the incompletely burned fuel, forming a secondary combustion, thereby reducing the content of carbon monoxide in the flue gas. The staged combustion makes the temperature in the flame area lower than 1100 °C, effectively reducing the generation of nitrogen oxides in the flue gas.

[0010] Further, on the upper surface of the burner body, the centers of the plurality of first gas holes are distributed along a first straight line, the centers of the plurality of oblique premixing holes and the centers of the plurality of oblique combustion-supporting air holes on the same side of the gas passage are both distributed along a second straight line, and the centers of the plurality of vertical combustion-supporting air holes on the same side of the gas passage are distributed along a third straight line. The first straight line, the second straight line, and the third straight line are parallel to each other and are all arranged along the length direction of the burner body. The first straight line is located in the middle position of the burner body. There is a distance h1 between the second straight line and the first straight line, and there is a distance h2 between the third straight line and the first straight line, and h2 > h1.

[0011] Further, the oblique premixing holes and the oblique combustion-supporting air holes on the same side of the gas passage are arranged in an alternating order; on the same width of the burner body, on different sides of the gas passage, the oblique combustion-supporting air holes are opposite to the oblique premixing holes.

[0012] Adopting the above preferred solution, the structural layout is compact and reasonable, improving the mixing effect of gas and air.

[0013] Further, for the oblique premixing holes, the vertical combustion-supporting air holes, and the oblique combustion-supporting air holes on the same side of the gas passage, if the vertical projection is in the length direction of the burner body, they are arranged in the order of oblique premixing holes, vertical combustion-supporting air holes, oblique combustion-supporting air holes, and vertical combustion-supporting air holes in a repeated manner.

[0014] Further, the oblique premixing holes and the oblique combustion-supporting air holes are circular holes, the apertures of the oblique premixing holes and the oblique combustion-supporting air holes are the same, the vertical combustion-supporting air holes are flat holes, and the width of the vertical combustion-supporting air holes is less than the radius of the oblique combustion-supporting air holes; the opening area of the oblique combustion-supporting air holes is 1.2 - 2 times the opening area of the vertical combustion-supporting air holes.

[0015] Adopting the above preferred solution, it ensures the distribution ratio of the combustion-supporting air in each area, not only ensuring the mixing effect of the fuel and the combustion-supporting gas, but also ensuring the reliable realization of the staged combustion, effectively reducing the temperature in the flame area and reducing the nitrogen oxide emissions.

[0016] Further, if the vertical projection is in the length direction of the burner body, the projection of the first gas hole is located at a position between the oblique premixing hole and the oblique combustion-supporting air hole.

[0017] Adopting the above preferred scheme can ensure the stable establishment of the flame.

[0018] Further, the position where the second gas hole communicates with the oblique premixing hole is located in the lower half of the oblique premixing hole; the opening area of the second gas hole is 1.5 - 4 times that of the first gas hole.

[0019] Adopting the above preferred scheme can improve the mixing effect of the gas and the combustion-supporting air in the second gas hole and prevent the generation of local high temperature.

[0020] Further, the diameter d1 of the first gas hole is 1 - 4 mm, and the distance between adjacent first gas holes is (8 - 13)d1.

[0021] Adopting the above preferred scheme can ensure the continuity of the flame on the entire linear burner.

[0022] Further, the angles between the oblique premixing hole and the oblique combustion-supporting air hole and the horizontal plane are 40 - 70°.

[0023] Further, the burner body is a casting, and the thickness of the burner body is 1 / 3 - 1 times its width.

[0024] Adopting the above preferred scheme can ensure the sufficiency of the oblique cross-mixing of the combustion-supporting air and the fuel.

[0025] Further, the profile of the low-nitrogen linear burner is grid-shaped and is formed by splicing a plurality of linear sub-modules and a plurality of corner-shaped sub-modules. The cross-sectional structure of the corner-shaped sub-module in the area other than the corner is the same as that of the linear sub-module. There is a concave pit that is concave downward from the upper surface at the corner of the burner body of the corner-shaped sub-module, and a lateral air inlet is provided at the outer corner of the concave pit; an air guiding device is also installed at the corner of the corner-shaped sub-module. The air guiding device includes an air collecting hood and a wind guiding hood. The opening of the air collecting hood faces the incoming direction of the process air. The upper part of the wind guiding hood is closed and has a lower opening communicating with the air collecting hood and a side air guiding port connected to the lateral air inlet of the concave pit.

[0026] Adopting the above preferred scheme, part of the process air is introduced to the burner corner through the air guiding device to participate in combustion support, effectively solving the problem of incomplete combustion caused by the fact that the vertical combustion-supporting air holes cannot be evenly distributed like other areas due to the limitation of the space distribution at the corner, and greatly reducing the emissions of nitrogen oxides and carbon monoxide in the flue gas.

[0027] Further, the air collecting hood includes an upper baffle and side baffles extending downward from the edges of the upper baffle, and the air guiding groove in the air guiding hood gradually deepens from the end far away from the side air guiding opening to the end close to the side air guiding opening.

[0028] By adopting the above preferred solution, the smoothness of the process air diversion is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a cross-sectional view of an embodiment of the present invention;

[0031] Figure 2 It is a perspective view of an embodiment of the burner body of the linear sub-module;

[0032] Figure 3 It is Figure 2 The corresponding schematic rear view of the burner body;

[0033] Figure 4 It is Figure 2 The corresponding top view of the burner body;

[0034] Figure 5 It is Figure 4 The cross-sectional view in the F-F direction in

[0035] Figure 6 It is Figure 4 The cross-sectional view in the G-G direction in

[0036] Figure 7 It is Figure 4 The cross-sectional view in the H-H direction in

[0037] Figure 8 It is the top view of another embodiment of the present invention;

[0038] Figure 9 It is the perspective view of the corner sub-module and the air guiding device;

[0039] Figure 10 It is the perspective view of the corner sub-module;

[0040] Figure 11 It is the perspective view of the air guiding device.

[0041] The names of the corresponding components represented by the numbers and letters in the figure:

[0042] 10 - Linear sub - module; 11 - Burner body; 12 - Gas channel; 13 - First gas hole; 14 - Second gas hole; 15 - Oblique premixing hole; 16 - Oblique combustion - assisting air hole; 17 - Vertical combustion - assisting air hole; 20 - Corner - type sub - module; 21 - Pit; 22 - Side air inlet; 30 - Combustion - assisting air duct; 31 - Air - equalizing plate; 40 - Flame - protecting plate; 50 - Induced - draft device; 51 - Air - collecting hood; 511 - Upper baffle; 512 - Side baffle; 52 - Air - guiding hood; 521 - Side air - guiding opening; 522 - Air - guiding groove. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0044] In the present invention, the upper and lower positions are defined with the flame emission direction of the burner as the upper, but this is only for clearly explaining the technical solution and does not mean that the flame emission direction must be upward when the burner is in use.

[0045] Such as Figure 2 、 3 As shown in 4, 9, and 10, in some embodiments of the present invention, both the oblique premixing holes and the oblique combustion - assisting air holes are circular holes. For the convenience of illustration, the oblique premixing holes are represented by thick lines, and the oblique combustion - assisting air holes are represented by thin lines.

[0046] Such as Figure 1-7 As shown, one embodiment of the present invention is: a low - nitrogen linear burner, which at least includes one linear sub - module 10. The linear sub - module 10 includes:

[0047] The burner body 11, on its base are provided with a gas channel 12, a plurality of first gas holes 13, a plurality of second gas holes 14, a plurality of inclined premixing holes 15, a plurality of inclined combustion-supporting air holes 16 and a plurality of vertical combustion-supporting air holes 17; the gas channel 12 is located at the middle position of the burner body 11 and extends along the length direction, the gas channel 12 is used to supply fuel for the burner body 11, both side surfaces of the gas channel 12 are inclined surfaces, and the gas channel 12 gradually becomes narrower from the lower part to the upper part; the first gas holes 13 extend upward from the middle position at the top of the gas channel 12 through to the upper surface of the burner body; the inclined premixing holes 15, the inclined combustion-supporting air holes 16 and the vertical combustion-supporting air holes 17 are all distributed in the base body of the burner body on both sides of the gas channel 12, the inclined premixing holes 15 and the inclined combustion-supporting air holes 16 both extend obliquely from the lower surface of the burner body 11 to the middle and penetrate through to the upper surface, the vertical combustion-supporting air holes 17 extend vertically from the lower surface of the burner body 11 through to the upper surface, and the second gas holes 14 extend from the side wall of the gas channel 12 through to the side wall of the inclined premixing holes 15;

[0048] The combustion-supporting air duct 30, which is connected to the bottom surface of the burner body 11, and the combustion-supporting air duct 30 is used to supply combustion-supporting air for the burner body;

[0049] The flame protection plate 40, which is installed on both sides of the burner body 11 and is higher than the upper surface of the burner body, and is used to prevent the interference of the process air on the flame on the burner body.

[0050] The beneficial effects of adopting the above technical solutions are as follows: a small part of the gas is ejected through the first gas holes, forming a flame in the middle of the burner, playing a role in connecting the flames and ensuring the stable establishment of the flame; most of the gas enters the inclined premixing holes through the second gas holes and is premixed with a small amount of combustion-supporting air first. At this time, the gas is in excess, and an incomplete primary combustion is formed on the surface of the burner, with a relatively low temperature; the inclined combustion-supporting air holes flow out the inclined cross-combustion-supporting air, strengthening the mixing with the unburned gas, and the vertical combustion-supporting air holes send the combustion-supporting air into the periphery of the primary combustion area, completely burning the unburned fuel to form secondary combustion, thereby reducing the content of carbon monoxide in the flue gas. The staged combustion reduces the temperature in the flame area and effectively reduces the generation of nitrogen oxides in the flue gas.

[0051] Such as Figure 4As shown in the figure, in some other embodiments of the present invention, on the upper surface of the burner body 11, the centers of a plurality of first gas holes 13 are distributed along a first straight line L1, the centers of a plurality of diagonal premixing holes 15 and the centers of a plurality of diagonal combustion-supporting air holes 16 on the same side of the gas passage are both distributed along a second straight line L2, and the centers of a plurality of vertical combustion-supporting air holes 17 on the same side of the gas passage are distributed along a third straight line L3. The first straight line L1, the second straight line L2, and the third straight line L3 are parallel to each other and are all arranged along the length direction of the burner body. The first straight line L1 is located at the middle position of the burner body. There is a spacing h1 between the second straight line L2 and the first straight line L1, and there is a spacing h2 between the third straight line L3 and the first straight line L1, and h2 > h1. The diagonal premixing holes 15 and the diagonal combustion-supporting air holes 16 on the same side of the gas passage are arranged in an alternating order; on the same width of the burner body, on different sides of the gas passage, the diagonal combustion-supporting air holes 16 are opposite to the diagonal premixing holes 15. The beneficial effect of adopting the above technical solution is that the structural layout is compact and reasonable, and the mixing effect of gas and air is improved.

[0052] As Figure 2-7 shown, in some other embodiments of the present invention, for the diagonal premixing holes 15, vertical combustion-supporting air holes 17, and diagonal combustion-supporting air holes 16 located on the same side of the gas passage, if the vertical projection is in the length direction of the burner body, they are arranged in a repeated order of diagonal premixing holes 15, vertical combustion-supporting air holes 17, diagonal combustion-supporting air holes 16, and vertical combustion-supporting air holes 17. The diagonal premixing holes 15 and the diagonal combustion-supporting air holes 16 are round holes, and the apertures of the diagonal premixing holes 15 and the diagonal combustion-supporting air holes 16 are the same. The vertical combustion-supporting air holes 17 are flat holes, and the width of the vertical combustion-supporting air holes 17 is less than the radius of the diagonal combustion-supporting air holes 16; the opening area of the diagonal combustion-supporting air holes 16 is 1.2 - 2 times that of the vertical combustion-supporting air holes 17. The beneficial effect of adopting the above technical solution is that it ensures the distribution ratio of the combustion-supporting air in each area, not only ensures the mixing effect of the fuel and the combustion-supporting gas, but also ensures the reliable realization of staged combustion, effectively reducing the temperature in the flame area and reducing the emission of nitrogen oxides.

[0053] As Figure 2 、 4 shown, in some other embodiments of the present invention, if the vertical projection is in the length direction of the burner body, the projection of the first gas hole 13 is located at a position between the diagonal premixing hole 15 and the diagonal combustion-supporting air hole 16. The beneficial effect of adopting the above technical solution is that it ensures the stable establishment of the flame.

[0054] As Figure 5-7As shown, in some other embodiments of the present invention, the position where the second gas hole 14 communicates with the oblique premixing hole 15 is located in the lower half of the oblique premixing hole 15; the opening area of the second gas hole 14 is 1.5 - 4 times that of the first gas hole 13. The beneficial effect of adopting the above technical solution is: improving the mixing effect of the gas and combustion-supporting air in the second gas hole and preventing the generation of local high temperature.

[0055] As Figure 2 , 4 As shown in Figures 5 and 6, in some other embodiments of the present invention, the diameter d1 of the first gas hole 13 is 1 - 4 mm, and the distance between adjacent first gas holes is (8 - 13)d1. The beneficial effect of adopting the above technical solution is: ensuring the continuity of the flame on the entire linear burner.

[0056] As Figure 5 , 7 As shown, in some other embodiments of the present invention, the angles between the oblique premixing hole 15 and the oblique combustion-supporting air hole 16 and the horizontal plane are 40 - 70°. The beneficial effect of adopting the above technical solution is: ensuring the sufficient oblique cross-mixing of the combustion-supporting air and the fuel.

[0057] In some other embodiments of the present invention, the burner body 11 is a casting, and the thickness of the burner body is 1 / 3 - 1 times its width.

[0058] As Figure 1 As shown, in some other embodiments of the present invention, in order to improve the air supply uniformity of the combustion-supporting air duct 30 to the burner body 11, an air distribution plate 31 is provided in the combustion-supporting air duct 30, and the air distribution plate 31 is provided with dense through holes.

[0059] As Figure 8-11 As shown, in some other embodiments of the present invention, the contour of the low-nitrogen linear burner is grid-shaped, and it is composed of a plurality of linear sub-modules 10 and a plurality of corner-shaped sub-modules 20 spliced together. In order to solve the problem of incomplete combustion caused by the fact that the vertical combustion-supporting air holes cannot be evenly distributed like other areas due to the limitation of the space distribution at the corner, the cross-sectional structure of the area of the corner-shaped sub-module 20 except at the corner is the same as that of the linear sub-module structure. There is a concave pit 21 recessed inward from the upper surface at the corner of the corner-shaped sub-module 20, and a lateral air inlet 22 is provided at the outer corner of the concave pit 21; an air guiding device 50 is also installed at the corner of the corner-shaped sub-module. The air guiding device 50 includes an air collecting hood 51 and a wind guiding hood 52. The opening of the air collecting hood 51 faces the incoming air direction of the process air. The upper part of the wind guiding hood 52 is closed and has a lower opening communicating with the air collecting hood 51 and a side air guiding port 521 connected to the lateral air inlet 22 of the concave pit. The beneficial effect of adopting the above technical solution is: introducing part of the process air into the burner corner through the air guiding device to participate in combustion support, greatly reducing the emissions of nitrogen oxides and carbon monoxide in the flue gas.

[0060] As Figure 11 shown, in some other embodiments of the present invention, the air collecting hood 51 includes an upper baffle 511 and side baffles 512 extending downward from the edge of the upper baffle 511. The air guiding groove 522 in the air guiding hood 52 gradually deepens from the end far away from the side air guiding opening to the end close to the side air guiding opening. The beneficial effect of adopting the above technical solution is: improving the smoothness of the process air diversion.

[0061] As Figure 10 shown, in some other embodiments of the present invention, in order to maximize the air outlet surface of the pit 21 at the corner of the corner-shaped sub-module, the side surface of the pit 21 close to the oblique premixing hole and the oblique combustion-supporting air hole adopts an inclined surface structure, and the slope of the inclined surface structure can be set to the same slope as the oblique premixing hole to maximize the pit space.

[0062] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it. However, the protection scope of the present invention cannot be limited thereby. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A low-nitrogen linear burner, characterized in that, At least including one linear sub-module, the linear sub-module includes: A burner body, on whose base there are a gas channel, a plurality of first gas holes, a plurality of second gas holes, a plurality of oblique premixing holes, a plurality of oblique combustion-supporting air holes and a plurality of vertical combustion-supporting air holes; the gas channel is located at the middle position of the burner body and extends along the length direction, the gas channel is used to provide fuel for the burner body, both side surfaces of the gas channel are inclined surfaces, and the gas channel gradually narrows from the lower part to the upper part; the first gas holes extend upward from the middle position at the top of the gas channel through to the upper surface of the burner body; the oblique premixing holes, the oblique combustion-supporting air holes and the vertical combustion-supporting air holes are all distributed in the base body of the burner body on both sides of the gas channel, the oblique premixing holes and the oblique combustion-supporting air holes both extend obliquely from the lower surface of the burner body to the middle and penetrate through to the upper surface, the vertical combustion-supporting air holes extend vertically from the lower surface of the burner body through to the upper surface, and the second gas holes extend through from the side wall of the gas channel to the side wall of the oblique premixing holes; on the upper surface of the burner body, the centers of the plurality of first gas holes are distributed along a first straight line, the centers of the plurality of oblique premixing holes and the plurality of oblique combustion-supporting air holes on the same side of the gas channel are both distributed along a second straight line, and the centers of the plurality of vertical combustion-supporting air holes on the same side of the gas channel are distributed along a third straight line. The first straight line, the second straight line and the third straight line are parallel to each other and are all arranged along the length direction of the burner body. The first straight line is at the middle position of the burner body. There is a spacing h1 between the second straight line and the first straight line, and there is a spacing h2 between the third straight line and the first straight line, and h2 > h1; the oblique premixing holes and the oblique combustion-supporting air holes on the same side of the gas channel are arranged in an alternating order; on the same width of the burner body, on different sides of the gas channel, the oblique combustion-supporting air holes are opposite to the oblique premixing holes; A combustion-supporting air duct, which is connected to the bottom surface of the burner body, and the combustion-supporting air duct is used to provide combustion-supporting air for the burner body; A fire protection plate, which is installed on both sides of the burner body and is higher than the upper surface of the burner body.

2. The low-nitrogen linear burner according to claim 1, characterized in that, For the oblique premixing holes, the vertical combustion-supporting air holes and the oblique combustion-supporting air holes on the same side of the gas channel, if the vertical projection is in the length direction of the burner body, they are arranged in a repeated order of oblique premixing holes, vertical combustion-supporting air holes, oblique combustion-supporting air holes, vertical combustion-supporting air holes.

3. The low-nitrogen linear burner according to claim 2, characterized in that, If the vertical projection is in the length direction of the burner body, the projection of the first gas hole is located at the position between the oblique premixing holes and the oblique combustion-supporting air holes.

4. The low-nitrogen linear burner according to claim 2, characterized in that, The oblique premixing holes and the oblique combustion-supporting air holes are circular holes, the apertures of the oblique premixing holes and the oblique combustion-supporting air holes are the same, the vertical combustion-supporting air holes are flat holes, and the width of the vertical combustion-supporting air holes is less than the radius of the oblique combustion-supporting air holes; the opening area of the oblique combustion-supporting air holes is 1.2 - 2 times the opening area of the vertical combustion-supporting air holes.

5. The low-nitrogen linear burner according to claim 1, characterized in that, The position where the second gas hole is connected to the oblique premixing hole is located in the lower half of the oblique premixing hole; the opening area of the second gas hole is 1.5 - 4 times the opening area of the first gas hole.

6. The low-nitrogen linear burner according to claim 5, characterized in that, The diameter d1 of the first gas hole is 1 - 4 mm, and the distance between adjacent first gas holes is (8 - 13)d1.

7. The low-nitrogen linear burner according to claim 1, characterized in that, The profile of the low-nitrogen linear burner is grid-shaped and is formed by splicing a plurality of linear sub-modules and a plurality of corner-shaped sub-modules. A concave pit recessed downward from the upper surface is provided at the corner of the burner body of the corner-shaped sub-module, and a lateral air inlet is provided at the outer corner of the concave pit; An air guiding device is also installed at the corner of the corner-shaped sub-module. The air guiding device includes an air collecting hood and a wind guiding hood. The opening of the air collecting hood faces the air inlet direction of the process air. The upper part of the wind guiding hood is closed and has a lower opening communicating with the air collecting hood and a side air guiding opening connected to the lateral air inlet of the concave pit.

8. The low-nitrogen linear burner according to claim 7, characterized in that, The air collecting hood includes an upper baffle and side baffles extending downward from the edge of the upper baffle. The air guiding groove in the wind guiding hood gradually deepens from the end far from the side air guiding opening to the end near the side air guiding opening.

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