An internal recirculation low-nitrogen burner
By integrating the spray box and purification layer into the internal circulation low-NOx burner, the space occupation problem caused by the separation of the filter and cooling equipment is solved, and efficient filtration and cooling of flue gas are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN HUAXIA BLUE SKY TECH CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-14
AI Technical Summary
The existing filters and cooling equipment are separate, which increases the space occupied by the equipment.
The device integrates filtration and cooling functions into one unit. Water is sprayed onto the flue gas through the liquid distribution component in the spray box to remove particulate impurities and absorb heat. The purification layer is used to filter and cool the flue gas.
It integrates flue gas filtration and cooling functions, reducing the overall space occupied by the equipment.
Smart Images
Figure CN224498521U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of burners, specifically to an internal circulation low-NOx burner. Background Technology
[0002] During burner operation, flue gas recirculation technology is used to control NOx generation and emissions during combustion. This involves introducing a portion of the generated flue gas into the combustion zone to dilute the oxygen concentration and absorb heat, effectively reducing the peak combustion temperature and thus significantly reducing the generation of thermal NOx. However, during flue gas recirculation, because the flue gas contains particulate impurities and has a high temperature, filters and cooling equipment are required to filter and cool the flue gas separately. Since the filters and cooling equipment are separate, this increases the space occupied by the equipment. Utility Model Content
[0003] The purpose of this invention is to provide an internal circulation low-NOx burner, which solves the problem that existing filters and cooling equipment are separate, increasing the space occupied by the equipment.
[0004] This utility model achieves the above-mentioned objective through the following technical solution: an internal circulation low-NOx burner, comprising: a fan, a burner head and a gas inlet pipe, wherein the fan is provided with a purification box, the inlet of the purification box is provided with a spray box, and the purification box is provided with a purification layer;
[0005] The spray box is equipped with a liquid distribution assembly, and the spray box is equipped with a flue gas pipe. The purification box is equipped with a circulation pipe, and the outlet of the circulation pipe is connected to the inlet of the flue gas pipe.
[0006] Preferably, the side wall of the spray box is provided with an air inlet for communicating with the flue gas pipe, and the spray box is provided with a bracket, and the bracket is provided with a guide plate facing the air inlet.
[0007] Preferably, the guide plate is slidably mounted on the bracket, and the guide plate moves along the flow direction of the flue gas entering the spray box. An elastic element is provided between the guide plate and the bracket.
[0008] Preferably, the spray box has an air outlet on its side wall, the air outlet is opposite to the air inlet, and the spray box has a baffle facing the air outlet.
[0009] Preferably, the liquid distribution assembly is located above the inner cavity of the spray box, and the bottom of the spray box is provided with a drain pipe.
[0010] Preferably, a drain outlet is provided between the spray box and the drain pipe, and guide blocks are provided inside the spray box around the drain outlet.
[0011] Preferably, the purification chamber is provided with a purification layer, and the circulation pipe and the purification layer are arranged sequentially in the purification chamber along the flue gas flow direction;
[0012] The purification layer is a drying component.
[0013] The beneficial effects of this utility model are as follows: by spraying water onto the flue gas through the liquid distribution component, particulate impurities in the flue gas are removed. At the same time, the water can absorb the heat in the flue gas by contacting it, thereby reducing the temperature of the flue gas. The spraying method achieves both the filtration and cooling functions of the flue gas, integrating filtration and cooling into one device and reducing the overall space occupied by the device. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the internal circulation low-NOx burner of this utility model;
[0015] Figure 2 This is a cross-sectional view of the connection between the purification box and the spray box of this utility model;
[0016] Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.
[0017] In the diagram: 1. Fan; 2. Purification box; 3. Spray box; 4. Circulation pipe; 5. Conduit; 6. Liquid distribution assembly; 7. Purification layer; 8. Baffle; 9. Guide block; 10. Support; 11. Guide plate; 12. Burner head; 13. Flue gas pipe. Detailed Implementation
[0018] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.
[0019] Example 1
[0020] Please see Figure 1 and Figure 2 An internal circulation low-NOx burner includes: a fan 1, a burner head 12, and a gas inlet pipe; the fan 1 is connected to a purification box 2 via a conduit 5, the purification box 2 has a purification layer 7 in its inner cavity, and the inlet of the purification box 2 is connected to a spray box 3 via a connecting pipe; the spray box 3 has a liquid distribution assembly 6 (including pipes and nozzles installed on the pipes) in its inner cavity, a flue gas pipe 13 is connected to the spray box 3, and a circulation pipe 4 (the circulation pipe 4 is made of a heat-conducting metal material, such as copper) is provided in the inner cavity of the purification box 2, and the outlet of the circulation pipe 4 is connected to the inlet of the flue gas pipe 13.
[0021] It should be noted that some of the flue gas after combustion is recovered and introduced into the circulation pipe 4, and then enters the inner cavity of the spray box 3 through the flue gas pipe 13. The liquid distribution component 6 inside the spray box 3 sprays water, which comes into contact with the flue gas to remove dust and particulate impurities, and also cools the flue gas. The filtered flue gas enters the purification box 2 and contacts the circulation pipe 4 for heat exchange. The residual heat in the flue gas is used to heat the flue gas, causing the water vapor in it to evaporate. The water vapor is then removed by the purification layer 7. The treated flue gas is mixed with the air guided by the fan 1 and enters the burner head 12 to mix and burn with the gas introduced by the gas inlet pipe.
[0022] It should also be noted that for acidic flue gas (such as that containing SO2), alkaline aqueous solutions (such as NaOH solution) can be used for spraying to simultaneously achieve desulfurization and dust removal, reducing the risk of equipment corrosion.
[0023] In this embodiment, as a further optimization, please refer to... Figure 2 The circulation pipe 4 and the purification layer 7 are arranged sequentially in the purification box 2 along the flue gas flow direction; the purification layer 7 is a drying component, such as activated alumina.
[0024] In this embodiment, as a further optimization, please refer to... Figure 2 and Figure 3 An air inlet is provided on the right side wall of the spray box 3, through which the flue gas pipe 13 is connected to the inner cavity of the spray box 3. A support 10 is provided on the right side of the inner cavity of the spray box 3, and a guide plate 11 is provided on the support 10, with the guide plate 11 facing the air inlet. When the flue gas enters the interior of the spray box 3 through the flue gas pipe 13 and the air inlet, it will come into contact with the guide plate 11. Due to the obstruction of the guide plate 11, the flue gas will be deflected, increasing the path of the flue gas flow inside the spray box 3. The guide plate 11 also causes the flue gas to diffuse, reducing the flue gas flow rate and increasing the residence time of the flue gas inside the spray box 3. This ensures that the flue gas can fully contact the water sprayed down by the liquid distribution component 6, thereby improving the efficiency of heat exchange and impurity removal.
[0025] In this embodiment, as a further optimization, please refer to... Figure 3 The guide plate 11 is slidably mounted on the support 10. The guide plate 11 moves along the flow direction of the flue gas entering the spray box 3. An elastic element (spring) is provided between the guide plate 11 and the support 10. When the flue gas velocity entering the spray box 3 is relatively fast, the guide plate 11 is subjected to a large impact force, which will cause the guide plate 11 to move away from the air inlet under the action of the impact force, thereby playing a force-relieving effect, slowing down the flue gas, increasing the residence time of the flue gas in the spray box 3, ensuring that impurities in the flue gas can be removed, and reducing the temperature of the flue gas to a predetermined temperature, thereby ensuring that nitrogen emissions can be reduced during flue gas circulation.
[0026] In this embodiment, as a further optimization, please refer to... Figure 2 An air outlet is provided on the left side wall of the spray box 3. The air outlet is connected to the connecting pipe and is opposite to the air inlet. A baffle 8 is provided in the inner cavity of the spray box 3, and the baffle 8 faces the air outlet. The baffle 8 can prevent the flue gas from directly entering the baffle 8. The flue gas needs to bypass the baffle 8 to enter the air outlet, which prolongs the time of the flue gas in the spray box 3 and ensures that the heat exchange medium can fully contact the flue gas.
[0027] In this embodiment, as a further optimization, please refer to... Figure 2 The liquid distribution component 6 is located above the inner cavity of the spray box 3, and the bottom of the spray box 3 is provided with a drain pipe; the liquid distribution component 6 sprays water from above, and after the water falls, it is discharged through the drain pipe and transported to the use area, such as by using a heat pump to recover the heat source in the water.
[0028] In this embodiment, as a further optimization, please refer to... Figure 2 A drain outlet is provided between the spray box 3 and the drain pipe. Guide blocks 9 are distributed around the drain outlet inside the spray box 3 to guide the water in the inner cavity of the spray box 3 and ensure that it enters the drain pipe.
[0029] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.
Claims
1. An internal circulation low-NOx burner, comprising: The fan (1), the burner head (12) and the gas inlet pipe are characterized in that the fan (1) is provided with a purification box (2), the inlet of the purification box (2) is provided with a spray box (3), and the purification box (2) is provided with a purification layer (7). The spray box (3) is equipped with a liquid distribution assembly (6), the spray box (3) is equipped with a flue gas pipe (13), the purification box (2) is equipped with a circulation pipe (4), and the outlet of the circulation pipe (4) is connected to the inlet of the flue gas pipe (13).
2. The internal circulation low-NOx burner according to claim 1, characterized in that, The spray box (3) has an air inlet on its side wall for communicating with the flue gas pipe (13). The spray box (3) has a bracket (10) inside, and the bracket (10) has a guide plate (11) facing the air inlet.
3. The internal circulation low-NOx burner according to claim 2, characterized in that, The guide plate (11) is slidably mounted on the bracket (10). The guide plate (11) moves along the flow direction of flue gas entering the spray box (3). An elastic element is provided between the guide plate (11) and the bracket (10).
4. The internal circulation low-NOx burner according to claim 2, characterized in that, The spray box (3) has an air outlet on its side wall, which is opposite to the air inlet. The spray box (3) has a baffle (8) facing the air outlet inside.
5. The internal circulation low-NOx burner according to claim 1, characterized in that, The liquid distribution assembly (6) is located above the inner cavity of the spray box (3), and the bottom of the spray box (3) is provided with a drain pipe.
6. The internal circulation low-NOx burner according to claim 5, characterized in that, A drain outlet is provided between the spray box (3) and the drain pipe, and guide blocks (9) are distributed around the drain outlet inside the spray box (3).
7. The internal circulation low-NOx burner according to claim 1, characterized in that, The circulation pipe (4) and the purification layer (7) are arranged sequentially in the purification box (2) along the flue gas flow direction; The purification layer (7) is a drying component.