A multi-channel multi-fuel low-nitrogen combustor

Abstract

This utility model discloses a multi-channel, multi-fuel, low-NOx burner, including a housing. A first annular plate and a second annular plate are fixedly connected to the inner wall of the housing. The multi-channel, multi-fuel, low-NOx burner also includes a combustion stabilization assembly and a gas gun assembly. The combustion stabilization assembly includes multiple swirl blades, which are helically fixedly connected to the second annular plate. An ignition gas gun is fixedly mounted on one of the swirl blades. The gas gun assembly includes a primary natural gas gun and multiple primary methanol release gas guns. The primary natural gas gun is fixedly mounted on the combustion stabilization assembly and located at the center of the combustion stabilization assembly. This multi-channel, multi-fuel, low-NOx burner can meet the combustion requirements of multiple waste gases while also adjusting the boiler load by controlling the waste gas mixing ratio, thereby improving the utilization rate of waste gases.

Description

Technical Field

[0001] This utility model belongs to the field of low-NOx burner technology, specifically relating to a multi-channel, multi-fuel low-NOx burner. Background Technology

[0002] With the rapid development of industrial production technology, the types of industrial waste gases are increasing, and their composition is becoming more complex. Direct emission into the air pollutes the environment, disrupts the ecological balance, and seriously threatens human health. Currently, industrial waste gases are mainly used for heating, power generation, and other fields through direct combustion, which not only saves energy but also brings economic benefits.

[0003] In existing technologies, low-NOx burners are widely used for the combustion treatment of various waste gases, aiming to improve combustion efficiency and reduce the generation of nitrogen oxides. However, when faced with industrial waste gases of different compositions, such as methanol off-gas and natural gas, existing low-NOx burners struggle to adjust boiler loads according to the differences in calorific value of the waste gases, resulting in limited waste gas combustion efficiency and heat energy conversion rate, and low utilization rate of waste gases.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a multi-channel, multi-fuel, low-NOx burner.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a multi-channel, multi-fuel, low-NOx burner that can solve the above-mentioned problems.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides a multi-channel, multi-fuel, low-NOx burner, including a housing. A first annular plate and a second annular plate are fixedly connected to the inner wall of the housing. The multi-channel, multi-fuel, low-NOx burner further includes a combustion stabilization assembly and a gas gun assembly. The combustion stabilization assembly includes multiple swirl vanes, which are helically fixedly connected to the second annular plate. An ignition gas gun is fixedly mounted on one of the swirl vanes. The gas gun assembly includes a primary natural gas gun and multiple primary methanol purge gas guns. The primary natural gas gun is fixedly mounted on the combustion stabilization assembly and located at the center of the combustion stabilization assembly. The multiple primary methanol purge gas guns are circumferentially distributed around the primary natural gas gun.

[0008] In one or more embodiments of the present invention, the gas gun assembly further includes a plurality of secondary natural gas guns, a tertiary natural gas gun, a secondary methanol purge gas gun, and a tertiary methanol purge gas gun. The plurality of secondary natural gas guns are circumferentially distributed around the primary natural gas gun, and the nozzles of the plurality of secondary natural gas guns are located in front of the combustion stabilization assembly.

[0009] In one or more embodiments of this utility model, the angle between the nozzle injection direction of the secondary natural gas gun and the combustion stabilization component is 35-45°.

[0010] In one or more embodiments of this utility model, the secondary natural gas gun is provided with a direct injection hole, and the injection direction of the direct injection hole is parallel to the axis of the housing.

[0011] In one or more embodiments of this utility model, the three-stage natural gas gun is uniformly fixed in a circumferential manner on the first annular plate, and the nozzles of the first-stage, second-stage, and third-stage natural gas guns are all multi-hole structures.

[0012] In one or more embodiments of this utility model, the angle between the nozzle spray direction of the primary methanol release gas gun and the combustion stabilization component is 50-55°.

[0013] In one or more embodiments of this utility model, the nozzle of the secondary methanol purge gun is parallel to the axis of the housing, the tertiary methanol purge gun is uniformly fixed in a circular shape on the first annular plate, and the nozzles of the primary methanol purge gun, the secondary methanol purge gun and the tertiary methanol purge gun are all multi-hole structures.

[0014] In one or more embodiments of this utility model, a venting exhaust gas gun is fixedly installed on the second annular plate, and the venting exhaust gas gun is located between the primary methanol venting gas gun and the secondary methanol venting gas gun.

[0015] In one or more embodiments of this utility model, a flame spreader is fixedly connected to the housing. The flame spreader is conical, and the diameter of the end of the flame spreader away from the housing is larger than the outer diameter of the housing.

[0016] In one or more embodiments of this utility model, a flange is fixedly connected to the housing.

[0017] Compared with the prior art, the multi-channel multi-fuel low-NOx burner of this utility model can not only meet the requirements of burning various exhaust gases, but also adjust the boiler load by controlling the mixing ratio of exhaust gases, thereby improving the utilization rate of exhaust gases. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a staged cylinder for a multi-channel, multi-fuel, low-NOx burner in one embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of a staged cylinder for a multi-channel, multi-fuel, low-NOx burner in one embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structure of a secondary natural gas gun in a multi-channel, multi-fuel, low-NOx burner according to one embodiment of the present invention.

[0022] Explanation of key figure labels:

[0023] 1. Shell; 2. Ignition gas gun; 3. First-stage natural gas gun; 4. Second-stage natural gas gun; 41. Direct injection port; 5. Third-stage natural gas gun; 6. First-stage methanol venting gas gun; 7. Second-stage methanol venting gas gun; 8. Third-stage methanol venting gas gun; 9. Venting exhaust gas gun; 10. Flame stabilization assembly; 1001. Swirl vane; 11. Flame diffuser tube; 12. Flange; 13. First annular plate; 14. Second annular plate. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] like Figures 1 to 3As shown, a multi-channel, multi-fuel, low-NOx burner according to one embodiment of the present invention includes a housing 1. A first annular plate 13 and a second annular plate 14 are welded to the inner wall of the housing 1. The multi-channel, multi-fuel, low-NOx burner also includes a combustion stabilization assembly 10 and a gas gun assembly. The combustion stabilization assembly 10 includes multiple swirl vanes 1001, which are spirally fixedly connected to the second annular plate 14. An ignition gas gun 2 is fixedly mounted on one of the swirl vanes 1001. The gas gun assembly includes a primary natural gas gun 3 and multiple primary methanol purge gas guns 6. The primary natural gas gun 3 is fixedly mounted on the combustion stabilization assembly 10 and located at the center of the combustion stabilization assembly 10. The multiple primary methanol purge gas guns 6 are circumferentially distributed around the primary natural gas gun 3.

[0026] Specifically, the primary natural gas gun 3 adopts a single-gun, multi-orifice structure, primarily serving to stabilize combustion and provide auxiliary combustion. Natural gas is supplied through pipelines to both the ignition gun 2 and the primary natural gas gun 3, and then ejected. The ignition gun 2 ignites the natural gas. Methanol purge gas is simultaneously supplied through pipelines to the primary methanol purge gas gun 6. Combustion air, after passing through the combustion stabilization component 10, is ejected in a clockwise spiral pattern, where it combines with the natural gas ejected from the primary natural gas gun 3 and the methanol purge gas ejected from the primary methanol purge gas gun 6 for combustion. The primary natural gas gun 3 can be stopped or continuously used for auxiliary combustion based on actual combustion stability. This not only satisfies the simultaneous combustion of the two waste gases but also allows for adjustment of the boiler load by adjusting the natural gas flow rate. Furthermore, the high calorific value of natural gas can improve the combustion efficiency of the methanol purge gas to some extent during auxiliary combustion.

[0027] Furthermore, the angle between the nozzle of the primary methanol purge gas gun 6 and the combustion stabilization assembly 10 is 50°. Specifically, the primary methanol purge gas is injected at a certain angle into the clockwise rotating combustion air, and mixes rapidly with the combustion air to form a stable reflux zone in the center of the combustion stabilization plate, ensuring stable combustion of the methanol purge gas injected from the primary methanol purge gas gun 6 and forming a stable primary combustion zone.

[0028] Furthermore, the gas gun assembly also includes multiple secondary natural gas guns 4, tertiary natural gas guns 5, secondary methanol purge gas guns 7, and tertiary methanol purge gas guns 8. The multiple secondary natural gas guns 4 are arranged in a circular pattern around the primary natural gas gun 3, and the nozzles of the multiple secondary natural gas guns 4 are located in front of the combustion stabilization assembly 10. The number of primary methanol purge gas guns 6 matches the number of secondary natural gas guns 4.

[0029] Specifically, the angle between the nozzle injection direction of the secondary natural gas gun 4 and the combustion stabilization component 10 is 45°. The secondary natural gas gun 4 is provided with a direct injection hole 41, and the injection direction of the direct injection hole 41 is parallel to the axis of the housing 1. The nozzle injection direction of the secondary methanol purge gas gun 7 is also parallel to the axis of the housing 1. The natural gas injected from the direct injection hole 41 on the secondary natural gas gun 4 and the methanol purge gas injected from the nozzle of the secondary methanol purge gas gun 7 mix and burn simultaneously at the nozzle of the housing 1. The combustion speed is slow and the combustion is uniform, forming a secondary combustion zone with low combustion temperature and low oxygen concentration.

[0030] It should be noted that because the nozzle of the secondary natural gas gun 4 is angled and located within the primary combustion zone, it increases the natural gas flow rate within the primary combustion zone while simultaneously promoting rapid mixing with the combustion air. When the primary natural gas gun 3 stops co-firing, the natural gas ejected from the nozzle of the secondary natural gas gun 4 replenishes the natural gas in the primary combustion zone. Furthermore, the secondary natural gas gun 4, evenly distributed circumferentially around the primary natural gas gun 3, allows for more uniform mixing with the methanol purge gas in the primary methanol purge gas gun 6, further improving the combustion efficiency of the methanol purge gas.

[0031] Furthermore, the three-stage natural gas gun 5 and the three-stage methanol purge gas gun 8 are uniformly fixed in a circular pattern on the first annular plate 13. Specifically, there is a three-stage methanol purge gas gun 8 between adjacent three-stage natural gas guns 5. The nozzles of the three-stage natural gas gun 5 and the three-stage methanol purge gas gun 8 respectively spray natural gas and methanol purge gas, forming a three-stage combustion zone in front of the first annular plate 13. A large amount of natural gas and methanol purge gas are injected into the three-stage combustion zone, but no air is injected. This zone is mainly a reducing atmosphere. The large amount of natural gas and methanol purge gas in the low temperature and low oxygen concentration zone reduces the nitrogen oxides generated by the combustion in the first and second stage combustion zones, greatly reducing the formation of nitrogen oxides during the entire combustion process.

[0032] Preferably, the nozzles of the first-stage natural gas gun 3, the second-stage natural gas gun 4, the third-stage natural gas gun 5, the first-stage methanol purge gas gun 6, the second-stage methanol purge gas gun 7, and the third-stage methanol purge gas gun 8 all have a multi-hole structure, which can improve the mixing uniformity.

[0033] Furthermore, a venting exhaust gas gun 9 is fixedly installed on the second annular plate 14. The venting exhaust gas gun 9 is located between the primary methanol venting gas gun 6 and the secondary methanol venting gas gun 7, and is situated within the secondary combustion zone. Specifically, the venting exhaust gas gun 9 is connected to the associated gas pipeline within the plant. The associated gas is discharged after passing through the secondary combustion zone, utilizing not only the heat energy from its combustion but also consuming the harmful gases within it, thus protecting the environment and ensuring safety.

[0034] like Figure 1As shown, a combustion diffuser tube 11 is welded onto the shell 1. The combustion diffuser tube 11 is conical, and the diameter of the end of the combustion diffuser tube 11 away from the shell 1 is larger than the outer diameter of the shell 1. The larger combustion space inside the combustion diffuser tube 11 allows the exhaust gas to burn better and ensures that the exhaust gas burns completely.

[0035] Furthermore, a flange 12 is welded onto the shell 1, which facilitates the installation of a multi-channel, multi-fuel, low-NOx burner onto the boiler.

[0036] In operation, combustion air is spirally ejected through the combustion stabilization assembly 10, mixing and burning with the natural gas ejected from the primary natural gas gun 3 and the secondary natural gas gun 4, and the methanol purge gas ejected from the primary methanol purge gas gun 6. A stable recirculation zone is formed at the center of the combustion stabilization assembly 10, ensuring stable combustion of the natural gas and methanol purge gas, thus forming a stable primary combustion zone. This stable primary combustion zone can smoothly ignite the secondary and tertiary combustion zones, ensuring stable combustion of different exhaust gases while facilitating boiler load adjustment and improving exhaust gas utilization.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-channel, multi-fuel, low-NOx burner, comprising a housing, wherein a first annular plate and a second annular plate are fixedly connected to the inner wall of the housing, characterized in that, The multi-channel multi-fuel low-NOx burner also includes: A combustion stabilization assembly, comprising multiple swirl blades, the multiple swirl blades being spirally fixedly connected to a second annular plate, and an ignition gun being fixedly mounted on one of the swirl blades; The gas gun assembly includes a primary natural gas gun and multiple primary methanol purge gas guns. The primary natural gas gun is fixedly installed on the combustion stabilization assembly and located at the center of the combustion stabilization assembly. The multiple primary methanol purge gas guns are distributed circumferentially around the primary natural gas gun.

2. The multi-channel multi-fuel low-NOx burner according to claim 1, characterized in that, The gas gun assembly also includes multiple secondary natural gas guns, a tertiary natural gas gun, a secondary methanol purge gas gun, and a tertiary methanol purge gas gun. The multiple secondary natural gas guns are arranged in a circular pattern around the primary natural gas gun, and the nozzles of the multiple secondary natural gas guns are located in front of the combustion stabilization assembly.

3. A multi-channel, multi-fuel, low-NOx burner according to claim 2, characterized in that, The angle between the nozzle of the secondary natural gas gun and the combustion stabilization component is 35-45°.

4. A multi-channel, multi-fuel, low-NOx burner according to claim 3, characterized in that, The secondary natural gas gun is equipped with a direct injection port, and the injection direction of the direct injection port is parallel to the axis of the housing.

5. A multi-channel, multi-fuel, low-NOx burner according to claim 2, characterized in that, The three-stage natural gas gun is uniformly fixed in a circular pattern on the first annular plate, and the nozzles of the first-stage, second-stage, and third-stage natural gas guns are all multi-hole structures.

6. A multi-channel, multi-fuel, low-NOx burner according to claim 1, characterized in that, The angle between the nozzle of the primary methanol release gas gun and the combustion stabilization component is 50-55°.

7. A multi-channel, multi-fuel, low-NOx burner according to claim 2, characterized in that, The nozzle of the secondary methanol purge gun is parallel to the axis of the housing, and the tertiary methanol purge gun is uniformly fixed in a circular pattern on the first annular plate. The nozzles of the primary, secondary, and tertiary methanol purge guns all have a multi-hole structure.

8. A multi-channel, multi-fuel, low-NOx burner according to claim 7, characterized in that, A venting exhaust gas gun is fixedly installed on the second annular plate, and the venting exhaust gas gun is located between the primary methanol venting gas gun and the secondary methanol venting gas gun.

9. A multi-channel, multi-fuel, low-NOx burner according to claim 1, characterized in that, A flame spreader tube is fixedly connected to the shell. The flame spreader tube is conical, and the diameter of the end of the flame spreader tube away from the shell is larger than the outer diameter of the shell.

10. A multi-channel, multi-fuel, low-NOx burner according to claim 1, characterized in that, A flange is fixedly connected to the housing.

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