Air gun for internal-circulation external-double-pipe ultra-low-nitrogen combustor
By designing a multi-directional injection structure of the double-tube ultra-low-nitrogen burner air gun with an inner circulation, combined with the high-temperature section components of the double-tube low-nitrogen burner with an inner circulation, the problems of easy damage to the burner air gun and high nitrogen oxide emissions in the prior art are solved, and the low nitrogen oxide emission and combustion safety are improved.
Patent Information
- Application Number
- CN202421750888.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The existing internal circulation low-nitrogen burner air gun device is prone to damage during the flue gas recovery process, resulting in a reduced service life and changes in combustion conditions, posing a combustion safety hazard, and it is difficult to effectively reduce nitrogen oxide emissions.
An internal circulation outer double-tube ultra-low nitrogen burner air gun was designed. Through the multi-directional injection structure of the main air gun and the secondary air gun, the mixed air gas is sprayed to the inside and outside of the throat. Combined with the high-temperature section component of the internal circulation outer double-tube low-nitrogen burner, the nitrogen oxide emission is achieved below 30mg/m3.
It effectively reduces the production of CO inside the throat and the production of nitrogen oxides outside the throat end, solves the problem of easy damage to the air gun mixing tube fixation, avoids combustion safety hazards, and achieves low nitrogen oxide emissions.
Smart Images
Figure CN222811755U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of internal circulation low nitrogen burners, and in particular relates to an internal circulation external double-tube ultra-low nitrogen burner air gun. Background Art
[0002] The air gun device of the internal circulation low-nitrogen burner on the market is damaged due to the recovery of flue gas, which not only reduces its service life, but more seriously, the damage to the air gun causes changes in combustion conditions such as the air gun flow rate, causing changes in the combustion conditions of the entire burner, and thus posing a combustion safety hazard.
[0003] Therefore, there is an urgent need for a new type of air gun device with an inner circulation and outer double-tube ultra-low nitrogen burner that can reduce combustion safety hazards and reduce nitrogen oxide emissions. Utility Model Content
[0004] The utility model is developed to solve the above problems and aims to provide an inner circulation outer double-tube ultra-low nitrogen burner air gun.
[0005] The utility model provides an inner-circulation outer double-tube ultra-low nitrogen burner air gun, which has the following characteristics: a throat, which is a hollow cylindrical structure, and the inner bottom thereof sprays combustion-supporting air toward the end; a main air gun, which comprises: a main air supply pipeline, which is a plurality of tubular structures uniformly arranged in a circle around the throat and parallel to the length direction of the throat, and is used to transport a mixed gas of natural gas and combustion-supporting air, the shortest distance between the main air supply pipeline and the wall surface of the throat is L1, a plurality of main outer spray gun heads, which are connected and arranged one-to-one at the end of the main air supply pipeline, and are used to spray the mixed gas to the outside of the end of the throat, the height of the end of the main outer spray gun head above the end of the throat is L3, a plurality of main inner spray gun heads, which are connected and arranged one-to-one at the main air supply pipeline, and pass through the wall surface of the throat of the hollow cylindrical structure. a secondary air gun, comprising: a secondary air supply line, which is a plurality of tubular structures evenly arranged in a circle around the throat and parallel to the length direction of the throat, and is used to transport the mixed gas, the shortest distance between the secondary air supply line and the wall of the throat is L2, and L1<L2; a secondary outer spray gun head, which is a plurality of heads, connected and arranged one-to-one at the end of the secondary air supply line, and is used to spray the mixed gas to the outside of the end of the throat, the height of the end of the secondary outer spray gun head above the end of the throat is L4; a secondary inner spray gun head, which is a plurality of heads, connected and arranged one-to-one at the secondary air supply line, and passes through the wall of the throat of the hollow cylindrical structure, and is used to fix the secondary air supply line and the throat and spray the mixed gas to the internal space of the throat.
[0006] The inner circulation outer double tube ultra-low nitrogen burner air gun provided by the utility model may also have the following features: wherein, L1=2.5mm~20mm, L2=50mm~140mm, L3=0mm~70mm, L4=0mm~100mm.
[0007] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following characteristics: wherein the number of main gas supply pipelines is 6 to 12, and the number of secondary gas supply pipelines is 6 to 12.
[0008] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following characteristics: the number of main gas supply pipelines and secondary gas supply pipelines is the same, and several main gas supply pipelines and several secondary gas supply pipelines are evenly arranged one by one in a circle outside the throat.
[0009] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following characteristics: wherein the main outer spray gun head and the secondary outer spray gun head are both in the shape of a truncated cone that is narrow at the top and wide at the bottom.
[0010] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following features: wherein the spray direction of the main outer spray gun head and / or the secondary outer spray gun head is parallel to the central axis of the throat of the hollow cylindrical structure; and / or the straight line where the spray direction of the main outer spray gun head and / or the secondary outer spray gun head is located or its reverse extension line passes through the central axis of the throat of the hollow cylindrical structure.
[0011] In the internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model, it can also have the following characteristics: wherein, the main air gun also includes a main built-in nozzle, and the secondary air gun also includes a secondary built-in nozzle. The main built-in nozzle and the secondary built-in nozzle are hollow cylindrical and are respectively arranged inside the main outer spray gun head and the secondary outer spray gun head, and are respectively used to increase the flow rate of the mixed gas sprayed from the main outer spray gun head and the secondary outer spray gun head when spraying, so as to further mix with the combustion-supporting air sprayed from the bottom of the throat to the end.
[0012] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following characteristics: wherein the height of the main built-in nozzle and the secondary built-in nozzle is L7, and L7=15mm~30mm.
[0013] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following features: wherein the shrinkage ratios of the main outer spray gun head and the secondary outer spray gun head, which are narrow at the top and wide at the bottom, are 37% to 45% and 30% to 35% respectively, the inner diameter of the main built-in nozzle is recorded as φ1, the inner diameter of the main air supply pipeline is recorded as φ2, the inner diameter of the secondary built-in nozzle is recorded as φ3, and the inner diameter of the secondary air supply pipeline is recorded as φ4, φ2 / φ4>φ1 / φ3.
[0014] The internal circulation external double-tube ultra-low nitrogen burner air gun provided by the utility model may also have the following characteristics: wherein the gas supply ratio of the main gas supply pipeline and the secondary gas supply pipeline is (45-55)%:(15-25)%.
[0015] Functions and effects of utility models
[0016] According to the internal circulation external double-tube ultra-low nitrogen burner air gun involved in the utility model, it includes: a throat, which is a hollow cylindrical structure, and its inner bottom sprays combustion-supporting air toward the end; a main air gun includes: a main air supply pipeline, which is a plurality of tubular structures evenly arranged in a circle around the throat and parallel to the length direction of the throat, and is used to transport the mixed gas, and the shortest distance between the main air supply pipeline and the wall of the throat is L1; a plurality of main outer spray gun heads are connected and arranged at the end of the main air supply pipeline in a one-to-one correspondence, and are used to spray the mixed gas to the outside of the throat end, and the height of the end of the main outer spray gun head above the throat end is L3; a plurality of main inner spray gun heads are connected and arranged on the main air supply pipeline in a one-to-one correspondence, and are passed through the wall of the throat of the hollow cylindrical structure, and are used to spray the main The air supply pipeline is fixed to the throat and sprays the mixed gas into the internal space of the throat at the same time; and the secondary air gun includes: a secondary air supply pipeline, which is a plurality of tubular structures evenly arranged in a circle around the throat and parallel to the length direction of the throat, and is used to transport the mixed gas. The shortest distance between the secondary air supply pipeline and the wall of the throat is L2, and L1<L2. There are a plurality of secondary outer spray gun heads, which are connected and arranged at the end of the secondary air supply pipeline in a one-to-one manner, and are used to spray the mixed gas to the outside of the end of the throat. The height of the end of the secondary outer spray gun head above the end of the throat is L4. There are a plurality of secondary inner spray gun heads, which are connected and arranged on the secondary air supply pipeline in a one-to-one manner, and pass through the wall of the throat of the hollow cylindrical structure, and are used to fix the secondary air supply pipeline to the throat and spray the mixed gas into the internal space of the throat at the same time.
[0017] Therefore, the utility model's internal circulation external double-tube ultra-low nitrogen burner air gun sprays the mixed gas in four directions, namely, the inside and outside of the throat end, through the main outer spray gun head and the main inner spray gun head of the main air gun, and the secondary outer spray gun head and the secondary inner spray gun head of the secondary air gun, so that the natural gas is distributed to different areas, thereby reducing the generation of CO inside the throat and the generation of nitrogen oxides outside the throat end. When used in conjunction with the high-temperature section component of the internal circulation external double-tube low nitrogen burner, the nitrogen oxide emission can be lower than 30mg / m 3 .
[0018] At the same time, the internal circulation external double-tube ultra-low nitrogen burner air gun of the utility model, through the arrangement of the main inner spray gun head and the secondary inner spray gun head, not only plays a role in dispersing gas, promoting the mixing of natural gas and combustion-supporting air to reduce the production of nitrogen oxides, but also solves the problem that the air gun mixing tube under the prior art needs to be fixed by a separate support and is in a high temperature zone and is easily burned red and damaged, further causing the air gun position to shift and affect the combustion state. It replaces the support and avoids safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a stereoscopic view of an inner-circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model;
[0020] Figure 2 It is a front cross-sectional view of an inner-circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model;
[0021] Figure 3 yes Figure 2 A magnified image of area A;
[0022] Figure 4 It is a top view of an inner circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model;
[0023] Figure 5 Figure 4 Enlarged view of area B;
[0024] Figure 6 It is a schematic structural diagram of the main outer spray gun head of the main air gun in the embodiment of the utility model in three different spray directions;
[0025] Figure 7 It is a structural schematic diagram of three different spraying directions of the secondary outer spray gun head of the secondary air gun in the embodiment of the utility model. DETAILED DESCRIPTION
[0026] In order to make the technical means, creative features, objectives and effects achieved by the utility model easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate an internal circulation external double-tube ultra-low nitrogen burner air gun of the utility model.
[0027] Figure 1 It is a stereoscopic view of an inner-circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model.
[0028] like Figure 1 As shown, this embodiment provides an internal circulation external double-tube ultra-low nitrogen burner air gun 100, including a base 10, a throat 20, a bracket 30, a main air gun 40 and a secondary air gun 50.
[0029] The base 10 serves as a base of the inner-circulation outer-double-tube ultra-low nitrogen burner air gun 100 .
[0030] The throat 20 is a hollow circular tube structure disposed on the base 10 , and the bottom of the throat 20 sprays combustion-supporting air toward the top.
[0031] The bracket 30 is a plurality of inverted “L”-shaped plates, which are evenly arranged around the bottom of the throat 20 so as to firmly fix the throat 20 and the base 10 .
[0032] Figure 2 It is a front cross-sectional view of an inner-circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model; Figure 3 yes Figure 2 A magnified image of area A; Figure 4 It is a top view of an inner circulation outer double-tube ultra-low nitrogen burner air gun in an embodiment of the utility model; Figure 5 Figure 4 Enlarged view of area B; Figure 6 It is a structural schematic diagram of three different spraying directions of the main outer spray gun head of the main air gun in an embodiment of the utility model.
[0033] like Figures 1 to 6 As shown, the main air gun 40 includes a main air supply pipeline 41 , a main outer spray gun head 42 , a main inner spray pipe 43 and a main inner spray gun head 44 .
[0034] The main air supply pipeline 41 is a tubular structure with an inner diameter of φ2, which is evenly arranged in a circle around the throat 20 and parallel to the length direction of the throat 20, and is used to transport the mixed gas. The shortest distance between the main air supply pipeline 41 and the wall of the throat 20 is L1, and L1 = 2.5mm~20mm.
[0035] The main external spray gun heads 42 are 12 truncated cone-shaped structures that are narrow at the top and wide at the bottom, with a shrinkage ratio of 37% to 45%. The 12 main external spray gun heads 42 are connected to the ends of the main air supply pipeline 41 one by one, and are used to spray the mixed gas to the outside of the end of the throat 20. The height of the end of the main external spray gun head 42 above the end of the throat 20 is L3, and L3 = 0mm to 70mm.
[0036] In this embodiment, the 12 main outer spray gun heads 42 have three spray directions: (a) the spray direction is parallel to the central axis of the throat 20 of the hollow circular tube structure; (b) the spray direction is toward the outside of the top of the throat 20, and the straight line where the spray direction is located passes through the central axis of the throat 20 of the hollow circular tube structure; (c) the spray direction is toward the inside of the top of the throat 20, and the straight line where the spray direction is located passes through the central axis of the throat 20 of the hollow circular tube structure. Specifically, the three spray directions and the number of the 12 main outer spray gun heads 42 are configured according to actual production needs.
[0037] The main internal nozzle 43 is a hollow cylindrical structure with an inner diameter of φ1, which is arranged inside the main external spray gun head 42, and is used to increase the flow rate of the mixed gas sprayed from the main external spray gun head 42 when spraying, so as to further mix with the combustion-supporting air sprayed from the bottom of the throat 20 to the end. The height of the main internal nozzle 43 is L7, and L7 = 15mm ~ 30mm.
[0038] There are 12 main internal spray gun heads 44, which are connected to the main air supply pipeline 41 in a one-to-one manner and pass through the wall of the throat 20 of the hollow circular tube structure. They are used to fix the main air supply pipeline 41 and the throat 20 and spray the mixed gas into the internal space of the throat 20 at the same time. The distance between the main internal spray gun head 44 and the end of the throat 20 is L5.
[0039] Figure 7 It is a structural schematic diagram of three different spraying directions of the secondary outer spray gun head of the secondary air gun in the embodiment of the utility model.
[0040] like Figures 1 to 7 As shown, the secondary air gun 50 includes a secondary air supply pipeline 51 , a secondary outer spray gun head 52 , a secondary inner spray pipe 53 and a secondary inner spray gun head 54 .
[0041] The secondary air supply pipeline 51 is a tubular structure with an inner diameter of φ4 and 12 pipes evenly arranged around the throat 20 and parallel to the length direction of the throat 20, used to transport the mixed gas. The shortest distance between the secondary air supply pipeline 51 and the wall of the throat 20 is L2, and L2=50mm~140mm, L1<L2. In this embodiment, the 12 main air supply pipelines 41 and the 12 secondary air supply pipelines 51 are evenly arranged around the throat 20 at intervals, and the air supply ratio of the main air supply pipeline 41 to the secondary air supply pipeline 51 is (45~55)%:(15~25)%.
[0042] The secondary outer spray gun heads 52 are 12 truncated cone-shaped structures that are narrow at the top and wide at the bottom, and the shrinkage ratio is 30% to 35%. The 12 secondary outer spray gun heads 52 are connected and arranged at the end of the secondary gas supply pipeline 51 in a one-to-one correspondence, and are used to spray the mixed gas to the outside of the end of the throat 20. The height of the end of the secondary outer spray gun head 52 above the end of the throat 20 is L4, and L4 = 0mm to 100mm. Specifically, in this embodiment, L3 < L4.
[0043] In this embodiment, the 12 secondary outer spray gun heads 52 have three spray directions: (a) the spray direction is parallel to the central axis of the throat 20 of the hollow circular tube structure; (b) the spray direction is toward the outside of the top of the throat 20, and the straight line where the spray direction is located passes through the central axis of the throat 20 of the hollow circular tube structure; (c) the spray direction is toward the inside of the top of the throat 20, and the straight line where the spray direction is located passes through the central axis of the throat 20 of the hollow circular tube structure. Specifically, the three spray directions and the number of the 12 secondary outer spray gun heads 52 are configured according to actual production needs.
[0044] The secondary built-in nozzle 53 is a hollow cylindrical structure with an inner diameter of φ3, which is arranged inside the secondary outer spray gun head 52, and is used to increase the flow rate of the mixed gas sprayed from the secondary outer spray gun head 52 when spraying, so as to further mix with the combustion-supporting air sprayed from the bottom of the throat 20 to the end. The height of the secondary built-in nozzle 53 is L7, and L7 = 15mm ~ 30mm. In this embodiment, φ2 / φ4>φ1 / φ3.
[0045] The number of the secondary inner spray gun heads 54 is 12, which are connected and arranged on the secondary gas supply pipeline 51 in a one-to-one correspondence, and pass through the wall surface of the throat 20 of the hollow circular tube structure, and are used to fix the secondary gas supply pipeline 51 and the throat 20 and spray the mixed gas into the internal space of the throat 20 at the same time. The distance between the secondary inner spray gun heads 54 and the end of the throat 20 is L6. Specifically, in this embodiment, L6<L5.
[0046] Functions and Effects of the Embodiments
[0047] According to the present embodiment, an internal circulation external double-tube ultra-low nitrogen burner air gun is provided, because it includes: a throat, which is a hollow cylindrical structure, and the inner bottom thereof sprays combustion-supporting air toward the end; a main air gun includes: a main air supply pipeline, which is a plurality of tubular structures evenly arranged in a circle around the throat and parallel to the length direction of the throat, and is used to transport the mixed gas, and the shortest distance between the main air supply pipeline and the wall of the throat is L1; a plurality of main outer spray gun heads are connected and arranged at the end of the main air supply pipeline in a one-to-one correspondence, and are used to spray the mixed gas to the outside of the throat end, and the height of the end of the main outer spray gun head above the throat end is L3; a plurality of main inner spray gun heads are connected and arranged on the main air supply pipeline in a one-to-one correspondence, and are passed through the wall of the throat of the hollow cylindrical structure, and are used to fix the main air supply pipeline and the throat and simultaneously spray the mixed gas to the internal space of the throat , the distance between the main inner spray gun head and the end of the throat is L5; and the secondary air gun, including: a secondary air supply pipeline, which is a plurality of tubular structures evenly arranged in a circle around the throat and parallel to the length direction of the throat, for conveying the mixed gas, the shortest distance between the secondary air supply pipeline and the wall of the throat is L2, and L1<L2, a secondary outer spray gun head, which is a plurality of heads, connected and arranged one-to-one at the end of the secondary air supply pipeline, for spraying the mixed gas to the outside of the end of the throat, the height of the end of the secondary outer spray gun head above the end of the throat is L4, and L3<L4, a secondary inner spray gun head, which is a plurality of heads, connected and arranged one-to-one at the secondary air supply pipeline, and passed through the wall of the throat of the hollow cylindrical structure, for fixing the secondary air supply pipeline and the throat and spraying the mixed gas to the internal space of the throat at the same time, the distance between the secondary inner spray gun head and the end of the throat is L6, and L6<L5.
[0048] Therefore, the internal circulation external double-tube ultra-low nitrogen burner air gun of this embodiment sprays the mixed gas in four directions, namely, the inside and outside of the throat end, through the main outer spray gun head and the main inner spray gun head of the main air gun, and the secondary outer spray gun head and the secondary inner spray gun head of the secondary air gun, so that the natural gas is distributed to different areas, thereby reducing the generation of CO inside the throat and the generation of nitrogen oxides outside the throat end. When used in conjunction with the high-temperature section component of the internal circulation external double-tube low nitrogen burner, the nitrogen oxide emission can be lower than 30 mg / m 3 .
[0049] At the same time, the internal circulation external double-tube ultra-low nitrogen burner air gun of this embodiment, through the arrangement of the main inner spray gun head and the secondary inner spray gun head, not only plays a role in dispersing gas, promoting the mixing of natural gas and combustion-supporting air to reduce the production of nitrogen oxides, but also solves the problem that the air gun mixing tube under the prior art needs to be fixed by a separate support and is in a high temperature zone and is easily burned red and damaged, further causing the air gun position to shift and affect the combustion state. It replaces the support and avoids safety hazards.
[0050] Furthermore, L1=2.5mm~20mm, L2=50mm~140mm, L3=0mm~70mm, L4=0mm~100mm. The number of main gas supply pipelines is 12, and the number of secondary gas supply pipelines is 12. Several main gas supply pipelines and several secondary gas supply pipelines are evenly arranged in a circle around the throat. This arrangement allows the gas ejected from the gun head to be graded and layered, and each level and each layer can stably burn each other without dry burning each other, and they can be mixed and burned in their own area to reduce the generation of nitrogen oxides; the position of the air gun head is the best range for low nitrogen oxide emissions after the demonstration of multiple tests, which ensures that the combustion is at the position with the fastest flow rate of the combustion-supporting wind, promotes the mixing of the combustion-supporting wind and the natural gas, and takes away the mixed gas in the mixing tube of the air gun to form a suspension after leaving the air gun head, burns away from the root of the gun head, reduces the combustion temperature at the root of the combustion head, and the overall position also avoids the formation of a high-temperature zone at the root of the combustion head by the overall flame, reducing the formation of nitrogen oxide emissions.
[0051] Furthermore, the main outer spray gun head and the secondary outer spray gun head are both in the shape of a truncated cone that is narrow at the top and wide at the bottom. The spray direction of the main outer spray gun head and / or the secondary outer spray gun head is parallel to the central axis of the throat of the hollow cylindrical structure; and / or the straight line where the spray direction of the main outer spray gun head and / or the secondary outer spray gun head is located or its reverse extension line passes through the central axis of the throat of the hollow cylindrical structure. This arrangement enables the air gun outside the throat to achieve 4-level gas distribution, which is an important technical means to reduce emissions. Among them, the air gun with the main outer spray gun head facing inward reduces the production of CO, and the air gun facing outward reduces the production of nitrogen oxides; the air gun with a straight mouth of the secondary outer spray gun head reduces the production of CO, and the air gun facing outward reduces the production of nitrogen oxides.
[0052] Furthermore, the shrinkage ratios of the main outer spray gun head and the secondary outer spray gun head, which are narrow at the top and wide at the bottom, are 37% to 45% and 30% to 35% respectively, the inner diameter of the main built-in spray pipe is recorded as φ1, the inner diameter of the main air supply pipeline is recorded as φ2, the inner diameter of the secondary built-in spray pipe is recorded as φ3, and the inner diameter of the secondary air supply pipeline is recorded as φ4, φ2 / φ4>φ1 / φ3. Such an arrangement increases the outlet flow rate of the mixed gas in the air gun mixing tube and promotes mixing.
[0053] Furthermore, the main air gun further includes a main built-in nozzle, and the secondary air gun further includes a secondary built-in nozzle. The main built-in nozzle and the secondary built-in nozzle are hollow cylindrical and are respectively arranged inside the main outer spray gun head and the secondary outer spray gun head, and are respectively used to increase the flow rate of the mixed gas sprayed from the main outer spray gun head and the secondary outer spray gun head when spraying, so as to further mix with the combustion-supporting air sprayed from the bottom of the throat to the end. The height of the main built-in nozzle and the secondary built-in nozzle is L7, and L7 = 15mm ~ 30mm. In this way, the injection length of the mixed gas is increased and the attenuation of the mixed gas flow rate is reduced.
[0054] Furthermore, the gas supply ratio of the main gas supply pipeline and the secondary gas supply pipeline is (45-55)%:(15-25)%. This arrangement further disperses the supply of the burner, and under the technology of pre-mixing the combustion-supporting air and natural gas, the mixing of the combustion-supporting air and the gas is strengthened, further reducing the concentration of the gas and achieving low emissions of nitrogen oxides.
[0055] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. An internal circulation external double-tube ultra-low nitrogen burner air gun, characterized in that: include: The throat is a hollow cylindrical structure, the bottom of which sprays combustion-supporting air toward the end; Main air gun, including: The main gas supply pipeline is a plurality of tubular structures evenly arranged around the throat and parallel to the length direction of the throat, used to transport a mixture of natural gas and combustion-supporting air. The shortest distance between the main gas supply pipeline and the wall of the throat is L1. There are several main external spray gun heads, which are connected to the ends of the main gas supply pipeline one by one and are used to spray the mixed gas to the outside of the throat end. The height of the main external spray gun head end above the throat end is L3. A plurality of main inner spray gun heads are connected to the main air supply pipeline in a one-to-one correspondence and pass through the wall of the throat of the hollow cylindrical structure, and are used to fix the main air supply pipeline and the throat and spray the mixed gas into the inner space of the throat at the same time; and Sub-air gun, including: The secondary air supply pipeline is a plurality of tubular structures evenly arranged around the throat and parallel to the length direction of the throat, and is used to transport the mixed gas. The shortest distance between the secondary air supply pipeline and the wall of the throat is L2, and L1<L2. There are several secondary external spray gun heads, which are connected to the ends of the secondary air supply pipeline one by one and are used to spray the mixed gas to the outside of the throat end. The height of the secondary external spray gun head end above the throat end is L4. There are several secondary internal spray gun heads, which are connected to the secondary air supply pipeline in a one-to-one correspondence and pass through the wall of the throat of the hollow cylindrical structure, so as to fix the secondary air supply pipeline and the throat and spray the mixed gas into the internal space of the throat at the same time.
2. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 1 is characterized in that: in, L1=2.5mm~20mm, L2=50mm~140mm, L3=0mm~70mm, L4=0mm~100mm.
3. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 1 is characterized in that: in, The number of the main gas supply pipelines is 6 to 12, and the number of the secondary gas supply pipelines is 6 to 12.
4. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 3 is characterized in that: in, The number of the main gas supply pipelines is the same as that of the secondary gas supply pipelines, A plurality of the main air supply pipelines and a plurality of the secondary air supply pipelines are evenly arranged in a circle around the throat at intervals.
5. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 1 is characterized in that: in, The main outer spray gun head and the secondary outer spray gun head are both in the shape of a truncated cone which is narrow at the top and wide at the bottom.
6. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 5 is characterized in that: in, The spraying direction of the main outer spray gun head and / or the secondary outer spray gun head is parallel to the central axis of the throat of the hollow cylindrical structure; and / or The straight line where the spraying direction of the main outer spray gun head and / or the secondary outer spray gun head is located or its reverse extension line passes through the central axis of the throat of the hollow cylindrical structure.
7. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 5 is characterized in that: in, The main air gun also includes a main built-in nozzle, and the secondary air gun also includes a secondary built-in nozzle. The main built-in nozzle and the secondary built-in nozzle are hollow cylindrical and are respectively arranged inside the main outer spray gun head and the secondary outer spray gun head, and are respectively used to increase the flow rate of the mixed gas sprayed from the main outer spray gun head and the secondary outer spray gun head when spraying, so as to further mix with the combustion-supporting air sprayed from the bottom of the throat to the end.
8. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 7 is characterized in that: in, The height of the main built-in nozzle and the secondary built-in nozzle is L7, and L7=15mm-30mm.
9. The inner circulation outer double-tube ultra-low nitrogen burner air gun according to claim 7 is characterized in that: in, The shrinkage ratios of the main outer spray gun head and the secondary outer spray gun head, which are truncated cone-shaped and narrow at the top and wide at the bottom, are 37% to 45% and 30% to 35% respectively. The inner diameter of the main built-in nozzle is denoted as φ1, the inner diameter of the main air supply pipeline is denoted as φ2, the inner diameter of the secondary built-in nozzle is denoted as φ3, and the inner diameter of the secondary air supply pipeline is denoted as φ4, φ2 / φ4>φ1 / φ3.
10. The inner circulation outer double tube ultra-low nitrogen burner air gun according to claim 1 is characterized in that: in, The ratio of the gas supply of the main gas supply pipeline to the gas supply of the secondary gas supply pipeline is (45-55)%:(15-25)%.