Cooling air device of pulverized coal burner
By introducing a combination of cooling tubes and heat exchange tubes into the pulverized coal burner, the problem of direct discharge of cooling air and waste of heat energy is solved, cooling and heat recovery are achieved, and energy utilization is improved.
Patent Information
- Application Number
- CN202422547445.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-22
AI Technical Summary
Traditional pulverized coal burners require a large amount of cooling air for cooling during operation. After absorbing heat, the cooling air is directly discharged into the atmosphere, wasting thermal energy resources and increasing the environmental heat load.
A pulverized coal burner cooling air device is designed. Through the combination of cooling pipes and heat exchange pipes, cooling water is used for heat recovery to achieve cooling of the cooling air and use it for preheating boilers or heating, thereby improving energy utilization.
The effective cooling of the pulverized coal burner is achieved, and the heat of the cooling air is recovered, thereby improving energy utilization and reducing environmental heat load.
Smart Images
Figure CN223345433U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pulverized coal burners, in particular to a cooling air device for a pulverized coal burner. Background Art
[0002] A pulverized coal burner is a combustion device used in coal-fired boilers. Its main function is to deliver pulverized coal and the air required for combustion into the furnace and organize a reasonable airflow structure to ensure that the pulverized coal can ignite quickly, burn stably and burn completely.
[0003] Specifically, pulverized coal burners perform the following functions: Fuel and air delivery: Through a specialized structural design, pulverized coal burners deliver pulverized coal, primary air carrying pulverized coal, and secondary air without pulverized coal into the furnace at a specific ratio, speed, and mixing pattern. This process not only ensures uniform distribution of the pulverized coal but also ensures an adequate supply of air for combustion. Promoting ignition and combustion: By rationally organizing the airflow structure, pulverized coal burners enable rapid and thorough mixing of pulverized coal and air, thereby reducing the heat required for ignition, allowing the pulverized coal to reach the ignition temperature quickly and achieving stable combustion. Furthermore, some advanced pulverized coal burners incorporate technologies such as fuel separation and a wide turndown ratio to further improve low-load combustion stability and efficiency. Optimizing flame shape: The design of pulverized coal burners focuses on ensuring that the flame fills the furnace to prevent the flame from hitting the wall or slagging. Furthermore, by adjusting the speed ratio and mixing pattern of the primary and secondary air, the flame shape can be optimized, resulting in a more efficient and clean combustion process. Improve fuel adaptability and load adjustment range: A good pulverized coal burner should have good fuel adaptability and load adjustment range, and be able to adapt to the needs of different coal types and load changes. This helps to improve the operating flexibility and economy of the boiler.
[0004] However, in actual use, conventional pulverized coal burners typically require a large amount of cooling air to cool them down during operation to prevent high temperatures from damaging internal burner components. However, this cooling air absorbs heat and is then directly discharged into the atmosphere, wasting valuable thermal energy and increasing the environmental heat load. Utility Model Content
[0005] The present utility model aims to provide a cooling air device for a pulverized coal burner, addressing the problem, as discussed in the background art, that conventional pulverized coal burners, during operation, typically require a large amount of cooling air to reduce the temperature in order to prevent damage to internal burner components caused by high temperatures. However, this cooling air, after absorbing heat, is directly discharged into the atmosphere, wasting valuable thermal energy resources and increasing the environmental heat load.
[0006] To achieve the above object, the present invention provides the following technical solution: comprising a pulverized coal burner body and a mounting base plate, wherein the front and rear sides of the upper end of the mounting base plate are fixedly mounted with mounting support frames;
[0007] The outer surface of the heat exchanger box is fixedly mounted on the outer surface of the heat exchanger box, and the exhaust pipe is fixedly mounted on the inner wall of the heat exchanger box for absorbing heat from the cooling chamber. The exhaust pipe is fixedly mounted on the inner wall of the heat exchanger box for absorbing heat from the cooling chamber. The exhaust pipe is fixedly mounted on the outer wall of the heat exchanger box, and the exhaust pipe is fixedly mounted on the outer wall of the heat exchanger box.
[0008] Preferably, the pulverized coal burner body is fixedly installed on the upper end of the mounting support frame, and fixing holes are opened through the four corners of the mounting base plate, and there are four fixing holes, which are symmetrically distributed at the four corners of the mounting base plate.
[0009] Preferably, the cooling pipes are distributed in a spiral shape on the inner wall of the cooling cavity.
[0010] Preferably, the heat exchange tubes are distributed in an S-shape inside the upper end of the heat recovery box.
[0011] Preferably, switch valves are fixedly installed on the outsides of the liquid inlet pipe and the liquid outlet pipe respectively.
[0012] Preferably, the stirring shaft is rotatably connected to the interior of the lower end of the heat recovery box through a rotating shaft.
[0013] Preferably, there are several stirring paddles, which are symmetrically distributed in an alternating manner along the outer curved surface in the middle of the stirring shaft.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] The utility model discloses that when the external cooling air enters the inside of the cooling pipe, the pulverized coal burner body will absorb heat and cool it down through the cooling pipe and the cooling cavity. At the same time, the cooling air after absorbing heat will enter the inside of the heat exchange pipe. When the cooling air after absorbing heat enters the inside of the heat exchange pipe, the cooling water is discharged into the heat recovery box through the liquid inlet pipe. When the cooling water is discharged into the heat recovery box, the heat exchange pipe and the cooling air inside the heat exchange pipe will be exchanged with the cooling water for cooling down. The cooled cooling air will be discharged to the outside through the air outlet hood. At the same time, the cooling water after heat exchange will be discharged to the outside through the liquid outlet pipe. When the cooling water after heat exchange is discharged to the outside, it can be used to preheat the boiler or provide heating, thereby realizing cooling down the pulverized coal burner body while cooling down the cooling air and improving the utilization rate of energy.
[0016] At the same time, when the driving motor is turned on, the utility model will drive the first sprocket to rotate. When the first sprocket rotates, it will drive the second sprocket to rotate through the chain transmission. When the second sprocket rotates, it will drive the stirring shaft to rotate. When the stirring shaft rotates, it will drive the stirring paddle to rotate. When the stirring paddle rotates, it will stir the cooling water inside the heat recovery box, thereby improving the heat exchange efficiency of the cooling water inside the heat recovery box. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the overall structure of a pulverized coal burner cooling air device of this utility model Figure 1 ;
[0018] Figure 2 This is a schematic diagram of the overall structure of a pulverized coal burner cooling air device of this utility model Figure 2 ;
[0019] Figure 3 The utility model is a cross-sectional schematic diagram of the overall structure of a cooling air device for a pulverized coal burner.
[0020] In the figure: 1. Pulverized coal burner body; 2. Mounting base plate; 3. Mounting support frame; 4. Fixing hole; 5. Cooling chamber; 6. Cooling pipe; 7. Air inlet cover; 8. Filter plate; 9. Heat exchange pipe; 10. Heat recovery box; 11. Air outlet cover; 12. Exhaust fan; 13. Liquid outlet pipe; 14. Drive motor; 15. First sprocket; 16. Second sprocket; 17. Stirring shaft; 18. Stirring paddle; 19. Liquid inlet pipe. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] See also Figure 1-3 The utility model provides a technical solution for a cooling air device for a pulverized coal burner: it includes a pulverized coal burner body 1 and a mounting base plate 2, a mounting support frame 3 is fixedly installed on the front and rear sides of the upper end of the mounting base plate 2, the pulverized coal burner body 1 is fixedly installed on the upper end of the mounting support frame 3, so that the pulverized coal burner body 1 is fixedly installed and supported by the mounting support frame 3, and fixing holes 4 are opened through the four corners of the mounting base plate 2, and there are four fixing holes 4, which are symmetrically distributed at the four corners of the mounting base plate 2, so that the mounting base plate 2 can be installed and fixed by fitting mounting bolts through the fixing holes 4;
[0023] A cooling chamber 5 is provided on the outer curved surface of the pulverized coal burner body 1. A cooling pipe 6 for absorbing heat from the cooling chamber 5 is fixedly installed on the inner wall of the cooling chamber 5, and the cooling pipe 6 is spirally distributed on the inner wall of the cooling chamber 5. The opening at the rear end of the cooling pipe 6 passes through the cooling chamber 5 and is fixedly connected to an air inlet hood 7. A filter screen plate 8 is fixedly installed at the outer opening of the air inlet hood 7. The outlet at the front bottom end of the cooling pipe 6 passes through the cooling chamber 5 and is fixedly connected to a heat exchange pipe 9. A heat recovery box 10 is fixedly installed in the middle of the upper end of the installation base plate 2, and the heat exchange pipe 9 is S-shaped and distributed inside the upper end of the heat recovery box 10. The outer opening of the heat exchange pipe 9 passes through the overheat recovery box 10 and is fixedly connected to an air outlet hood 11. An exhaust fan 12 is fixedly supported at the outer opening of the air outlet hood 11. The upper side end of the box 10 is fixedly connected to a liquid inlet pipe 19, and the lower side end of the heat recovery box 10 is fixedly connected to a liquid outlet pipe 13, and switch valves are fixedly installed on the outside of the liquid inlet pipe 19 and the liquid outlet pipe 13, respectively. The front support of the upper end of the mounting base 2 is fixedly installed with a drive motor 14, and the front end transmission shaft part of the drive motor 14 is fixedly installed with a first sprocket 15. The outer end of the first sprocket 15 is connected to the second sprocket 16 through a chain drive. A stirring shaft 17 is fixedly installed in the middle of the second sprocket 16, and the stirring shaft 17 is rotatably connected to the lower end of the heat recovery box 10 through a rotating shaft. A stirring paddle 18 is fixedly installed on the outer curved surface in the middle of the stirring shaft 17, and there are several stirring paddles 18, which are staggered and symmetrically distributed in sequence on the outer curved surface in the middle of the stirring shaft 17.
[0024] Working principle: When the utility model needs to cool down the pulverized coal burner main body 1, the exhaust fan 12 is turned on by control. When the exhaust fan 12 is turned on, the exhaust fan 12 will discharge the air inside the air outlet hood 11 to the outside. When the air inside the air outlet hood 11 is discharged to the outside, a negative pressure will be generated inside the air outlet hood 11, so that the air inside the heat exchange tube 9 and the cooling tube 6 will flow outward along the air outlet hood 11 and be discharged. When the air inside the heat exchange tube 9 and the cooling tube 6 will flow outward along the air outlet hood 11 and be discharged, the external cooling air will enter the cooling tube 6 through the air inlet hood 7, and the external cooling air will be blocked and filtered by the filter plate 8 to prevent external impurities from entering the cooling tube 6 and causing blockage in the cooling tube 6. At the same time, when the external cooling air enters the cooling tube 6 When the pulverized coal burner body 1 is inside the pipe 6, the cooling pipe 6 cooperates with the cooling chamber 5 to absorb heat and cool the pulverized coal burner body 1. At the same time, the cooling air after absorbing heat will enter the heat exchange pipe 9. When the cooling air after absorbing heat enters the heat exchange pipe 9, the cooling water is discharged into the heat recovery box 10 through the liquid inlet pipe 19. When the cooling water is discharged into the heat recovery box 10, the heat exchange pipe 9 and the cooling air inside the heat exchange pipe 9 are heat-exchanged and cooled by the cooling water. The cooled cooling air is discharged outward through the air outlet hood 11. At the same time, the cooling water after heat exchange is discharged outward through the liquid outlet pipe 13. When the cooling water after heat exchange is discharged outward, it can be used to preheat the boiler or provide heating, thereby cooling the pulverized coal burner body 1 while cooling the cooling air and improving the utilization rate of energy.
[0025] At the same time, by controlling to turn on the drive motor 14, when the drive motor 14 is turned on, it will drive the first sprocket 15 to rotate. When the first sprocket 15 rotates, it will drive the second sprocket 16 to rotate through the chain transmission. When the second sprocket 16 rotates, it will drive the stirring shaft 17 to rotate. When the stirring shaft 17 rotates, it will drive the stirring paddle 18 to rotate. When the stirring paddle 18 rotates, it will stir the cooling water inside the heat recovery tank 10, thereby improving the heat exchange efficiency of the cooling water inside the heat recovery tank 10.
[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0027] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A cooling air device for a pulverized coal burner, characterized in that: It comprises a pulverized coal burner body (1) and a mounting base plate (2), wherein a mounting support frame (3) is fixedly mounted on the front and rear sides of the upper end of the mounting base plate (2); The outer curved surface of the pulverized coal burner body (1) is provided with a cooling cavity (5), the inner wall of the cooling cavity (5) is fixedly mounted with a cooling pipe (6) for absorbing heat from the cooling cavity (5), the rear end opening of the cooling pipe (6) passes through the cooling cavity (5) and is fixedly connected to an air inlet hood (7), the outer opening of the air inlet hood (7) is fixedly mounted with a filter screen (8), the front bottom outlet of the cooling pipe (6) passes through the cooling cavity (5) and is fixedly connected to a heat exchange pipe (9), the middle portion of the upper end of the mounting base plate (2) is fixedly mounted with a heat recovery box (10), the outer opening of the heat exchange pipe (9) passes through the overheat recovery box (10) and is fixedly connected to an air outlet hood (11), An exhaust fan (12) is supported and fixed at the outer opening of the air outlet cover (11); a liquid inlet pipe (19) is fixedly connected to the upper side end of the heat recovery box (10); and a liquid outlet pipe (13) is fixedly connected to the lower side end of the heat recovery box (10). A driving motor (14) is fixedly supported and installed on the front side support of the upper end of the mounting base plate (2); a first sprocket (15) is fixedly installed on the front transmission shaft portion of the driving motor (14); the outer end of the first sprocket (15) is connected to the second sprocket (16) through a chain transmission; a stirring shaft (17) is fixedly installed in the middle of the second sprocket (16); and a stirring paddle (18) is fixedly installed on the outer curved surface in the middle of the stirring shaft (17).
2. A pulverized coal burner cooling air device according to claim 1, characterized in that: The pulverized coal burner body (1) is fixedly mounted on the upper end of the mounting support frame (3), and fixing holes (4) are provided through the four corners of the mounting base plate (2), and there are four fixing holes (4) symmetrically distributed at the four corners of the mounting base plate (2).
3. A pulverized coal burner cooling air device according to claim 2, characterized in that: The cooling pipe (6) is distributed in a spiral shape on the inner wall of the cooling cavity (5).
4. A pulverized coal burner cooling air device according to claim 3, characterized in that: The heat exchange tubes (9) are distributed in an S-shape inside the upper end of the heat recovery box (10).
5. A pulverized coal burner cooling air device according to claim 4, characterized in that: Switch valves are fixedly mounted on the outsides of the liquid inlet pipe (19) and the liquid outlet pipe (13), respectively.
6. A pulverized coal burner cooling air device according to claim 5, characterized in that: The stirring shaft (17) is rotatably connected to the interior of the lower end of the heat recovery box (10) via a rotating shaft.
7. A pulverized coal burner cooling air device according to claim 6, characterized in that: There are a plurality of stirring paddles (18), which are symmetrically distributed in a staggered manner along the outer curved surface in the middle of the stirring shaft (17).