A new water-cooled burner

Abstract

The utility model belongs to the technical field of combustor, especially a novel water -cooled combustor, including fan, mixer and combustion casing that connect in proper order, be equipped with combustion chamber in the combustion casing, be equipped with multiple water -cooling pipes in the combustion chamber, leave the gas passageway that supplies mixed gas to pass between two water -cooling pipes of adjacent, the side surface of water -cooling pipe far away from mixer is combustion surface, be equipped with water mist spray pipe no.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, and specifically refers to a new type of water-cooled burner. Background Technology

[0002] With the advancement of national energy conservation and emission reduction projects, the requirements for nitrogen oxide emissions and energy efficiency are becoming increasingly stringent. Various water-cooled combustion technologies have emerged on the market, but most suffer from the following problems: 1. When the water-cooled tube bundle absorbs a significant amount of heat, the oxygen content in the exhaust gas can reach approximately 3.5% when nitrogen oxides are below 30mg, but this increases the risk of tube rupture and shortens boiler lifespan; 2. When the water-cooled tube bundle absorbs a relatively small amount of heat, the oxygen content in the exhaust gas needs to reach above 5% when nitrogen oxides are below 30mg, resulting in lower boiler efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a novel water-cooled burner that effectively reduces the generation of nitrogen oxides, reduces the oxygen content in the exhaust gas under low nitrogen requirements, and effectively reduces the occurrence of tube rupture.

[0004] This utility model is implemented as follows: A novel water-cooled burner includes a fan, a mixer, and a combustion shell connected in sequence. The combustion shell contains a combustion chamber with multiple water-cooled pipes. An air passage for the mixed gas is provided between two adjacent water-cooled pipes. The surface of the water-cooled pipes away from the mixer is the combustion surface. The mixer is equipped with a first water mist spray pipe, the inner end of which extends into the mixer. The combustion shell is equipped with a second water mist spray pipe, the inner end of which extends into the combustion chamber, with the portion of the inner end of the second water mist spray pipe extending into the combustion chamber located on the side of the water-cooled pipes away from the mixer.

[0005] In the above-mentioned novel water-cooled burner, the fan is connected to one end of the mixer, the combustion shell is connected to the other end of the mixer, the mixer is provided with a gas inlet pipe that communicates with the inner cavity of the mixer, and the water mist spray pipe is located on the side of the gas inlet pipe away from the fan.

[0006] In the above-mentioned novel water-cooled burner, the water mist spray pipe includes a connecting section one, a limiting section and a connecting section two arranged in sequence. The connecting section one is provided with an external thread that is screwed to the gas pipeline. The inner end of the connecting section two extends into the mixer and the outer end is provided with an external thread that is screwed to the mixer. The major diameter of the connecting section one and the connecting section two is smaller than the diameter of the limiting section.

[0007] In the above-mentioned novel water-cooled burner, a connecting plate is welded to the outside of the combustion shell, and a connecting nut is welded to the outer end of the connecting plate. The second water mist spray pipe is screwed to the connecting nut, and the second water mist spray pipe passes through the connecting plate and extends into the combustion chamber.

[0008] In the aforementioned novel water-cooled burner, the air outlet of the fan is connected to the mixer, and an air filter is provided at the air inlet of the fan.

[0009] The outstanding advantages of this utility model compared to the prior art are: This invention features a water mist nozzle, the first of which extends into the mixer, and a water mist nozzle, the second of which extends into the combustion chamber, on the combustion shell. The water mist sprayed by the first and second nozzles evaporates, carrying away a significant amount of heat and further cooling the flame as it forms on the combustion surface. This effectively reduces the generation of nitrogen oxides, lowers the oxygen content in the exhaust gas under low-NOx requirements, and also effectively reduces the occurrence of pipe bursts, thus extending the service life of the water-cooled pipes. Furthermore, the water mist in the mixer ensures that the air-fuel mixture carries water mist before entering the combustion chamber, with the water mist evenly distributed throughout the mixture. The water mist inside the combustion chamber further increases the water mist content, resulting in excellent flame cooling. Attached Figure Description

[0010] Figure 1 This is the front view of this utility model.

[0011] Figure 2 This is the left view of this utility model.

[0012] Figure 3 yes Figure 2 A cross-sectional view along line AA.

[0013] Figure 4 yes Figure 3 Enlarged view of point C.

[0014] Figure 5 yes Figure 2 A cross-sectional view along line BB.

[0015] Reference numerals in the attached diagram: 1. Fan; 2. Mixer; 3. Combustion shell; 4. Combustion chamber; 5. Water cooling pipe; 6. Combustion surface; 7. Water mist nozzle one; 7a. Connecting section one; 7b. Limiting section; 7c. Connecting section two; 8. Water mist nozzle two; 9. Gas intake pipe; 10. Connecting plate; 11. Connecting nut; 12. Air filter. Detailed Implementation

[0016] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —5: A novel water-cooled burner includes a fan 1, a mixer 2, and a combustion shell 3 connected in sequence. The combustion shell 3 has a combustion chamber 4, and the combustion chamber 4 has multiple water-cooled pipes 5. An air passage is left between two adjacent water-cooled pipes 5 for the mixed gas to pass through. The surface of the water-cooled pipe 5 away from the mixer 2 is the combustion surface 6. The mixer 2 is provided with a water mist spray pipe 7, the inner end of which extends into the mixer 2. The combustion shell 3 is provided with a water mist spray pipe 8, the inner end of which extends into the combustion chamber 4, and the part of the inner end of the water mist spray pipe 8 extending into the combustion chamber 4 is located on the side of the water-cooled pipe 5 away from the mixer 2.

[0017] The working principle of this utility model is as follows: Figure 1-5 As shown, fresh air enters the mixer 2 via fan 1 and mixes with the gas to form a gas mixture. Water mist sprayed from water mist nozzle 7 follows the gas mixture into the combustion chamber 4, where it burns. Water mist sprayed from water mist nozzle 8 evaporates in the combustion chamber 4, carrying away a large amount of heat. This further cools the flame at the combustion surface 6 as soon as it forms, effectively reducing the generation of nitrogen oxides and lowering the oxygen content in the exhaust gas under low-NOx requirements. The steam formed by the evaporation of water mist in the combustion chamber 4 is discharged through the boiler flue along with the flue gas. The heat carried away is exchanged with the boiler in the boiler, without affecting the use of the original water-cooled tube bundle.

[0018] This invention features a water mist nozzle 7 extending into the mixer 2 and a water mist nozzle 8 extending into the combustion chamber 4 on the combustion shell 3. The water mist sprayed by the nozzles 7 and 8 evaporates, carrying away a large amount of heat and further cooling the flame at the moment it forms on the combustion surface 6. This effectively reduces the generation of nitrogen oxides, lowers the oxygen content in the exhaust gas under low-NOx requirements, and also effectively reduces the occurrence of pipe bursts, thus improving the service life of the water-cooled pipe 5. Furthermore, the water mist in the mixer 2 ensures that the mixture carries water mist before entering the combustion chamber 4, with the water mist evenly distributed within the mixture. The water mist inside the combustion chamber 4 further increases the water mist content, resulting in better flame cooling.

[0019] In order to allow the water mist to mix better with the air-fuel mixture, such as Figure 1 , 3 As shown in Figure 5, the blower 1 is connected to one end of the mixer 2, the combustion shell 3 is connected to the other end of the mixer 2, the mixer 2 is provided with a gas inlet pipe 9 that communicates with the inner cavity of the mixer 2, and the water mist spray pipe 7 is located on the side of the gas inlet pipe 9 away from the blower 1.

[0020] The specific structure of water mist nozzle 7: as follows Figure 4As shown, the water mist spray pipe 7 includes a connecting section 7a, a limiting section 7b, and a connecting section 7c arranged sequentially. The connecting section 7a has an external thread for screwing into a gas pipeline. The inner end of the connecting section 7c extends into the mixer 2, and the outer end has an external thread for screwing into the mixer 2. The major diameter of both the connecting section 7a and the connecting section 7c is smaller than the diameter of the limiting section 7b. The limiting section 7b limits the installation position of the water mist spray pipe 7 on the mixer 2. The structure is simple and easy to process and install.

[0021] Installation structure of water mist nozzle 2 8: A connecting plate 10 is welded to the outside of the combustion shell 3, and a connecting nut 11 is welded to the outer end of the connecting plate 10. The water mist nozzle 2 8 is screwed to the connecting nut 11, and the water mist nozzle 2 8 passes through the connecting plate 10 and extends into the combustion chamber 4.

[0022] In order to filter the fresh air entering fan 1, such as Figure 1 , 2 As shown in Figure 5, the air outlet of the fan 1 is connected to the mixer 2, and the air inlet of the fan 1 is provided with an air filter 12.

[0023] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A novel water-cooled burner, comprising a fan (1), a mixer (2), and a combustion shell (3) connected in sequence, wherein a combustion chamber (4) is provided inside the combustion shell (3), and multiple water-cooled pipes (5) are provided inside the combustion chamber (4), with an air passage for the mixed gas to pass through between two adjacent water-cooled pipes (5), and the surface of the water-cooled pipe (5) away from the mixer (2) is a combustion surface (6), characterized in that: The mixer (2) is provided with a water mist nozzle (7), the inner end of which extends into the mixer (2). The combustion shell (3) is provided with a water mist nozzle (8), the inner end of which extends into the combustion chamber (4), and the part of the inner end of the water mist nozzle (8) extending into the combustion chamber (4) is located on the side of the water cooling pipe (5) away from the mixer (2).

2. The novel water-cooled burner according to claim 1, characterized in that: The fan (1) is connected to one end of the mixer (2), and the combustion shell (3) is connected to the other end of the mixer (2). The mixer (2) is provided with a gas inlet pipe (9) that connects to the inner cavity of the mixer (2). The water mist spray pipe (7) is located on the side of the gas inlet pipe (9) away from the fan (1).

3. The novel water-cooled burner according to claim 1, characterized in that: The water mist spray pipe (7) includes a connecting section (7a), a limiting section (7b), and a connecting section (7c) arranged in sequence. The connecting section (7a) has an external thread that is screwed into the gas pipeline. The inner end of the connecting section (7c) extends into the mixer (2), and the outer end has an external thread that is screwed into the mixer (2). The major diameter of the connecting section (7a) and the connecting section (7c) is smaller than the diameter of the limiting section (7b).

4. A novel water-cooled burner according to claim 1, characterized in that: The combustion shell (3) is welded with a connecting plate (10), and a connecting nut (11) is welded to the outer end of the connecting plate (10). The second water mist spray pipe (8) is screwed to the connecting nut (11), and the second water mist spray pipe (8) passes through the connecting plate (10) and extends into the combustion chamber (4).

5. A novel water-cooled burner according to claim 1, characterized in that: The air outlet of the fan (1) is connected to the mixer (2), and an air filter (12) is provided at the air inlet of the fan (1).

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