A biomass gas low-nitrogen combustor

Abstract

This utility model belongs to the field of burners, specifically relating to a low-NOx biomass gas burner, including a burner with an air inlet fixedly installed at the left end. A mixing chamber is bolted to the outside of the air inlet, and a heat insulation cover is fixedly installed on the lower outer part of the mixing chamber. A bent pipe is fixedly installed at the lower end of the mixing chamber. This utility model, by adding a rotating shaft, blades, and annular nozzle to the mixing chamber, allows the flue gas to be injected into the combustion-supporting gas through the annular nozzle during flue gas recirculation. Simultaneously, the blades mix the gas inside the mixing chamber, effectively improving the mixing quality and making the mixture of flue gas and combustion-supporting gas more uniform. Furthermore, the residual heat of the mixing chamber can be used to heat the combustion-supporting gas inside the spiral tube before it enters the mixing chamber, further improving the uniformity of the mixture and making combustion more stable.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically a low-NOx biomass gas burner. Background Technology

[0002] As a renewable and clean energy source, the development of efficient and low-NOx combustion technology for biomass gas is of great significance for achieving sustainable energy utilization and environmental protection. Conventional biomass gas burners typically mix the fuel gas directly with ambient temperature combustion air before introducing it into the combustion zone. However, this simple mixing method often suffers from uneven mixing and significant localized high-temperature zones. Furthermore, the introduction of low-temperature combustion air into the combustion zone lowers the overall temperature of the reaction zone, which is detrimental to combustion stability and efficiency, and easily leads to the large-scale generation of thermal nitrogen oxides (NOx), making it difficult to meet increasingly stringent environmental emission requirements. In existing technologies, some burners attempt to reduce combustion temperature and suppress NOx formation through flue gas recirculation. However, such designs often suffer from complex structures, unstable flue gas recirculation, and potential pressure fluctuations or backflow pollution in the gas supply system. Furthermore, traditional static mixing structures have limited mixing effects on the gas medium, making it difficult to achieve sufficient and uniform mixing of gas, oxygen, and recirculated flue gas in a short time. More importantly, existing technologies generally lack effective utilization of waste heat within the combustion system. They fail to use the waste heat of high-temperature flue gas to raise the temperature of the combustion medium, directly incorporating room-temperature oxygen (or air) into combustion. This absorbs a large amount of reaction heat, lowering the temperature level of the combustion zone, which not only affects combustion efficiency and stability but also hinders the achievement of low-NOx combustion from the source. Therefore, improvements to existing technologies are necessary. Utility Model Content

[0003] The purpose of this invention is to provide a low-NOx biomass gas burner that solves the problems of uneven mixing of flue gas and combustion-supporting gas and low temperature of injected combustion-supporting gas affecting low-NOx combustion.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a biomass gas low-NOx burner, comprising a burner, an air inlet fixedly installed at the left end of the burner, a mixing chamber bolted to the outside of the air inlet, a heat insulation cover fixedly installed at the lower part of the outside of the mixing chamber, a bent pipe fixedly installed at the lower end of the mixing chamber, a spiral tube fixedly connected to one end of the bent pipe, an oxygen pipe fixedly installed at the end of the spiral tube away from the bent pipe, an anti-backflow mechanism provided inside the mixing chamber, a flue gas pipe fixedly installed inside the mixing chamber, an annular nozzle fixedly installed at one end of the flue gas pipe inside the mixing chamber, a rotating shaft mounted inside the mixing chamber via bearings, and multiple evenly distributed blades fixedly connected to the outside of the rotating shaft.

[0005] Preferably, the bent pipe is in contact with the insulation cover, the oxygen pipe is fixedly connected to the insulation cover, and the oxygen pipe can inject combustion-supporting gas into the interior of the mixing chamber.

[0006] Preferably, a sealing sleeve is fixedly installed on the inner top of the mixing box, and the sealing sleeve is rotatably connected to the rotating shaft. The sealing sleeve can seal the connection between the mixing box and the rotating shaft.

[0007] Preferably, a sealing ring is bonded to the inside of the air inlet, and the sealing ring is slidably connected to the connecting pipe of the mixing box. The sealing ring can seal the connection between the air inlet and the mixing box.

[0008] Preferably, a motor is fixedly installed at the upper end of the mixing box, and the output shaft of the motor is fixedly connected to the rotating shaft, so that the motor can drive the rotating shaft to rotate.

[0009] Preferably, the anti-backflow mechanism includes a fixed frame, which is fixedly installed on the inner bottom of the mixing box. A movable plate is slidably connected to the outer side of the fixed frame, and a sealing cover is fixedly connected to the lower end of the movable plate. A spring is provided on the outer side of the fixed frame, and the sealing cover is slidably connected to the opening of the bend, so that the sealing cover can seal the bend.

[0010] Preferably, one end of the spring is fixedly connected to the fixed frame, and the other end of the spring is fixedly connected to the movable plate. The spring can support the movable plate through its elastic force.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by adding a rotating shaft, blades, and annular nozzle to the mixing chamber, allows the flue gas to be injected into the combustion-supporting gas through the annular nozzle during the flue gas recirculation process. At the same time, the blades mix the gas inside the mixing chamber, thereby effectively improving the mixing quality and making the mixture of flue gas and combustion-supporting gas more uniform. Furthermore, the residual heat of the mixing chamber can be used to heat the combustion-supporting gas inside the spiral tube before it enters the mixing chamber, which can further improve the uniformity of the mixture and make the combustion more stable.

[0012] 2. This utility model adds a fixed frame, a movable plate, and a sealing cover inside the mixing box. When the combustion-supporting gas is injected into the mixing box through the bend, the pressure of the combustion-supporting gas needs to be greater than the elastic force of the spring in order to push the sealing cover away from the bend. After the gas supply stops, the thrust disappears, and the spring can use its elastic force to drive the sealing cover to seal the opening of the bend, thereby effectively preventing flue gas from flowing back into the interior of the bend. Attached Figure Description

[0013] Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 For the present utility model Figure 1 A partial three-dimensional sectional view of the structure; Figure 3 For the present utility model Figure 1 A three-dimensional sectional view of the heat insulation cover; Figure 4 For the present utility model Figure 2 Enlarged view of the A-section structure; Figure 5 For the present utility model Figure 4 A magnified 3D view of the movable plate.

[0014] In the diagram: 1. Burner; 2. Air inlet; 3. Mixing box; 4. Insulation cover; 5. Bend; 6. Spiral tube; 7. Oxygen pipe; 8. Anti-backflow mechanism; 9. Flue gas pipe; 10. Annular nozzle; 11. Shaft; 12. Blade; 13. Motor; 14. Sealing sleeve; 15. Sealing ring; 81. Fixing frame; 82. Moving plate; 83. Sealing cover; 84. Spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 A biomass gas low-NOx burner includes a burner 1, an air inlet 2 fixedly installed at the left end of the burner 1, a mixing box 3 bolted to the outside of the air inlet 2, an insulation cover 4 fixedly installed at the lower part of the outside of the mixing box 3, a bend 5 fixedly installed at the lower end of the mixing box 3, a spiral tube 6 fixedly connected to one end of the bend 5, an oxygen tube 7 fixedly installed at the end of the spiral tube 6 away from the bend 5, an anti-backflow mechanism 8 is provided inside the mixing box 3, a flue gas pipe 9 is fixedly installed inside the mixing box 3, an annular nozzle 10 is fixedly installed at one end of the flue gas pipe 9 inside the mixing box 3, and a rotating shaft 11 is installed inside the mixing box 3 via bearings, with multiple evenly distributed blades 12 fixedly connected to the outside of the rotating shaft 11.

[0017] Please see Figure 1-5The bend 5 contacts the insulation cover 4, and the oxygen pipe 7 is fixedly connected to the insulation cover 4. The oxygen pipe 7 can inject combustion-supporting gas into the mixing box 3. A sealing sleeve 14 is fixedly installed on the top inner side of the mixing box 3. The sealing sleeve 14 is rotatably connected to the rotating shaft 11. The sealing sleeve 14 can seal the connection between the mixing box 3 and the rotating shaft 11. A sealing ring 15 is bonded inside the air inlet 2. The sealing ring 15 is slidably connected to the connecting pipe of the mixing box 3. The sealing ring 15 can seal the connection between the air inlet 2 and the mixing box 3. A motor 13 is fixedly installed at the upper end of the mixing box 3. The output shaft of the motor 13 is fixedly connected to the rotating shaft 11. The motor 13 can drive the rotating shaft 11 to rotate.

[0018] Please see Figure 1-5 The backflow prevention mechanism 8 includes a fixed frame 81. The fixed frame 81 is fixedly installed on the bottom inner side of the mixing box 3. A movable plate 82 is slidably connected to the outer side of the fixed frame 81. A sealing cover 83 is fixedly connected to the lower end of the movable plate 82. A spring 84 is provided on the outer side of the fixed frame 81. The sealing cover 83 is slidably connected to the opening of the bend 5. The sealing cover 83 can seal the bend 5. One end of the spring 84 is fixedly connected to the fixed frame 81, and the other end of the spring 84 is fixedly connected to the movable plate 82. The spring 84 can support the movable plate 82 with its elastic force.

[0019] The specific implementation process of this utility model is as follows: During use, flue gas enters the interior of the mixing box 3 through the flue gas pipe 9 and the annular nozzle 10. At the same time, the pressure inside the bend pipe 5 is greater than the elastic force of the spring 84. The combustion-supporting gas pushes the sealing cover 83 to move upward. The sealing cover 83 compresses the spring 84 through the moving plate 82. When the sealing cover 83 is disengaged from the bend pipe 5, the combustion-supporting gas can be injected into the interior of the mixing box 3. At the same time, the motor 13 is started. The motor 13 drives the blade 12 to rotate through the rotating shaft 11. During the rotation, the blade 12 can disturb the gas inside the mixing box 3, thereby effectively improving the mixing quality. The mixed gas enters the interior of the burner 1 for combustion. While oxygen is supplied to the interior of the spiral tube 6 through the oxygen tube 7, the spiral tube 6 can absorb the residual heat generated by the mixing box 3, thereby raising the temperature of the combustion-supporting gas inside the spiral tube 6. After being heated, the gas can be injected into the interior of the mixing box 3 through the bend pipe 5, which can effectively reduce the temperature difference between the combustion-supporting gas and the flue gas, and lower the ignition temperature.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomass gas low-NOx burner, comprising a burner (1), characterized in that: An air inlet (2) is fixedly installed on the left end of the burner (1). A mixing box (3) is installed on the outside of the air inlet (2) by bolts. An insulation cover (4) is fixedly installed on the lower part of the outside of the mixing box (3). A bent pipe (5) is fixedly installed at the lower end of the mixing box (3). A spiral pipe (6) is fixedly connected to one end of the bent pipe (5). An oxygen pipe (7) is fixedly installed at the end of the spiral pipe (6) away from the bent pipe (5). An anti-backflow mechanism (8) is provided inside the mixing box (3). A flue gas pipe (9) is fixedly installed inside the mixing box (3). An annular nozzle (10) is fixedly installed at one end of the flue gas pipe (9) inside the mixing box (3). A rotating shaft (11) is installed inside the mixing box (3) by bearings. Multiple evenly distributed blades (12) are fixedly connected to the outside of the rotating shaft (11).

2. The biomass gas low-NOx burner according to claim 1, characterized in that: The bent pipe (5) is in contact with the heat insulation cover (4), and the oxygen pipe (7) is fixedly connected to the heat insulation cover (4).

3. A low-NOx biomass gas burner according to claim 1, characterized in that: A sealing sleeve (14) is fixedly installed on the top inner side of the mixing box (3), and the sealing sleeve (14) is rotatably connected to the rotating shaft (11).

4. A low-NOx biomass gas burner according to claim 1, characterized in that: A sealing ring (15) is bonded to the inside of the air inlet (2), and the sealing ring (15) is slidably connected to the connecting pipe of the mixing box (3).

5. A low-NOx biomass gas burner according to claim 1, characterized in that: A motor (13) is fixedly installed at the upper end of the mixing box (3), and the output shaft of the motor (13) is fixedly connected to the rotating shaft (11).

6. A low-NOx biomass gas burner according to claim 1, characterized in that: The anti-backflow mechanism (8) includes a fixed frame (81). The fixed frame (81) is fixedly installed on the bottom inner side of the mixing box (3). A movable plate (82) is slidably connected to the outside of the fixed frame (81). A sealing cover (83) is fixedly connected to the lower end of the movable plate (82). A spring (84) is provided on the outside of the fixed frame (81). The sealing cover (83) is slidably connected to the opening of the bend (5).

7. A low-NOx biomass gas burner according to claim 6, characterized in that: One end of the spring (84) is fixedly connected to the fixed frame (81), and the other end of the spring (84) is fixedly connected to the movable plate (82).

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