Secondary combustion chamber for solid waste treatment

Abstract

The utility model relates to a kind of secondary combustion chamber for solid waste treatment, including shell, the bottom of shell is equipped with air inlet, top is equipped with air outlet, shell bottom is equipped with burner, shell bottom end outside is also equipped with closed loop wind device, closed loop wind device is used to the direction of the shell radial direction in the shell for air intake, to make flue gas spiral flow from the air inlet to the air outlet;Closed loop wind device includes two groups of air intake components respectively distributed in the shell two sides, air intake component includes main pipe and the multiple branch pipes connected on main pipe, branch pipe one end is communicated to the shell, the other end is closed.The utility model increases closed loop wind device, the combustion time of original combustion track is increased from 2.8 seconds to 3.8 seconds, can effectively increase combustion time, reduce the detonation phenomenon caused by too short combustion time, avoid producing CO flue gas overproof, can reduce the risk of flue gas overproof.

Description

Technical Field

[0001] This utility model relates to the field of solid waste treatment technology, specifically to a secondary combustion chamber for solid waste treatment. Background Technology

[0002] In waste treatment, especially in the incineration of hazardous waste and general waste, secondary combustion chambers are typically installed to improve combustion efficiency and reduce the emission of harmful substances. In these chambers, unburned gases and particulate matter are further and more fully combusted, thereby reducing the emission of pollutants such as dioxins.

[0003] Currently, to ensure complete combustion, the diameter is increased or the height is raised to extend the residence time of high-temperature flue gas. However, this method not only increases the floor space but also increases equipment investment. At the same time, in the existing secondary combustion chamber, the flue gas is discharged under the pressure inside the secondary combustion chamber, which still makes it difficult to achieve complete combustion of the flue gas and ensure the emission standards of pollutants. Utility Model Content

[0004] The purpose of this invention is to provide a secondary combustion chamber for solid waste treatment. This invention helps to achieve a more thorough combustion process by increasing the residence time of combustible gas in the secondary combustion chamber and increasing the combustion temperature.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A secondary combustion chamber for solid waste treatment includes a cylindrical shell with an inner cavity. The shell has an air inlet at the bottom and an air outlet at the top. A burner is located at the bottom of the shell. A closed-loop air device is also provided outside the bottom end of the shell. The closed-loop air device is used to introduce air into the shell in a direction deviating from the radial direction of the shell, so that the flue gas spirals from the air inlet to the air outlet. The closed-loop air device includes two sets of air inlet assemblies distributed on both sides of the shell. Each air inlet assembly includes a main pipe and multiple branch pipes connected to the main pipe. One end of each branch pipe is connected to the shell, and the other end is closed. Each branch pipe includes a first pipe section welded to the shell and a second pipe section welded to the main pipe. The first and second pipe sections are connected by flanges.

[0007] Preferably, the main pipe is constructed as an arcuate pipe segment concentric with the housing, the two ends of the main pipe are closed, and an air inlet flange is provided in the middle.

[0008] Preferably, one end of the branch pipe is sealed with a flange blind plate.

[0009] Preferably, the branch pipes are all at an angle of 30°-45° to the radial direction of the housing.

[0010] Preferably, the closed-loop air device is located above the air inlet.

[0011] Preferably, the lower part of the housing is provided with a fire observation window.

[0012] Preferably, the upper part of the housing is provided with an inspection door next to the air outlet.

[0013] Compared with the prior art, the technical solution of this application has the following technical effects:

[0014] 1. By adding a closed-loop air device, this utility model increases the combustion time of the original combustion trajectory from 2.8 seconds to 3.8 seconds, which can effectively increase the combustion time, reduce the deflagration phenomenon caused by the short combustion time, avoid excessive CO flue gas, and reduce the risk of excessive flue gas.

[0015] 2. After the material enters the rotary kiln or secondary combustion chamber, it produces a more complete combustion effect, improving combustion efficiency and incineration rate.

[0016] 3. This utility model has a simple structure, low manufacturing cost, and high practicality. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the closed-loop air device in this utility model.

[0020] In the diagram: 10. Shell; 11. Air inlet; 12. Air outlet; 13. Burner; 14. Observation window; 15. Inspection door; 20. Closed-loop air device; 21. Air intake assembly; 22. Main pipe; 23. Branch pipe; 24. Air intake flange; 25. First pipe section; 26. Second pipe section. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] As a preferred embodiment of this utility model, see attached... Figure 1 and Figure 2 As shown: This embodiment provides a secondary combustion chamber for solid waste treatment, including a cylindrical shell 10 with an inner cavity. The shell 10 has an air inlet 11 at the bottom and an air outlet 12 at the top. A burner 13 is provided at the bottom of the shell 10. A closed-loop air device 20 is also provided outside the bottom end of the shell 10. The closed-loop air device 20 is used to introduce air into the shell 10 in a direction deviating from the radial direction of the shell 10, so that the flue gas flows spirally from the air inlet 11 to the air outlet 12. The closed-loop air device 20 includes two sets of air intake components 21 respectively distributed on both sides of the shell 10. The air intake component 21 includes a main pipe 22 and multiple branch pipes 23 connected to the main pipe 22. One end of each branch pipe 23 is connected to the shell 10, and the other end is closed. Each branch pipe 23 includes a first pipe section 25 welded to the shell 10 and a second pipe section 26 welded to the main pipe 22. The first pipe section 25 and the second pipe section 26 are connected by a flange.

[0023] In the above embodiments, such as Figure 2 As shown, the main pipe 22 is constructed as an arc-shaped pipe segment concentric with the housing 10. Both ends of the main pipe 22 are closed, and an air inlet flange 24 is provided in the middle for connection to the air intake system flange. The first pipe segment 25 is welded to the housing 10, and the second pipe segment 26 is welded to the main pipe 22. The two segments are connected by a flange, which shortens the installation and replacement time of the branch pipe 23 and reduces the difficulty and cost of installation and replacement.

[0024] In the above embodiment, two independent gas supply modules are set on both sides of the housing 10, and the main pipe 22 adopts an arc-shaped structure concentric with the housing 10, which can avoid airflow deflection caused by unilateral air supply, make the swirling field distribution uniform, and improve combustion stability.

[0025] In a preferred embodiment, such as Figure 2 As shown, one end of the branch pipe 23 is sealed with a flange blind plate.

[0026] In some preferred embodiments, such as Figure 2 As shown, each branch pipe 23 forms an angle of 30°-45° with the radial direction of the housing 10. In this embodiment, the angle α between the branch pipe 23 and the radial direction of the housing 10 is 30°-45°. By creating tangential airflow disturbance through tangential air intake, the flue gas can be forced to spiral upward, which can prolong the flue gas residence time and improve the efficiency by 20%-30% compared with the traditional direct-flow combustion, ensuring that unburned particles are fully combusted and reducing the emission of harmful gases.

[0027] In some preferred embodiments, such as Figure 1 As shown, the closed-loop air device 20 is located above the air inlet 11.

[0028] In the above embodiments, such as Figure 1 As shown, the lower part of the housing 10 is provided with a fire observation window 14; the upper part of the housing 10 is provided with an inspection door 15 next to the air outlet 12.

[0029] In this embodiment, the observation window 14 is located at the corresponding position of the combustion zone, and the inspection door 15 is located next to the air outlet 12, so as to realize real-time visual monitoring of the combustion status. Maintenance personnel can directly approach the key components from the top. In normal use, it is convenient to observe the combustion status intuitively, so as to adjust and control the air intake, etc. During maintenance, it is also possible to quickly reach the key parts and improve maintenance efficiency.

[0030] It should be noted that, in order to maintain the temperature in the secondary combustion chamber, the closed-loop air device 20 needs to exchange heat before introducing hot air, and at the same time increase the intake air pressure to more than 1000Pa to improve the combustion effect.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A secondary combustion chamber for solid waste treatment, comprising a cylindrical shell (10) with an inner cavity, wherein the shell (10) has an air inlet (11) at the bottom and an air outlet (12) at the top, and a burner (13) at the bottom of the shell (10), characterized in that: The bottom of the housing (10) is also provided with a closed-loop air device (20). The closed-loop air device (20) is used to introduce air into the housing (10) in a direction that deviates from the radial direction of the housing (10), so that the flue gas flows spirally from the air inlet (11) to the air outlet (12). The closed-loop air device (20) includes two sets of air intake components (21) respectively distributed on both sides of the housing (10). The air intake components (21) include a main pipe (22) and multiple branch pipes (23) connected to the main pipe (22). One end of the branch pipe (23) is connected to the housing (10), and the other end is closed. The branch pipe (23) includes a first pipe section (25) welded to the housing (10) and a second pipe section (26) welded to the main pipe (22). The first pipe section (25) and the second pipe section (26) are connected by a flange.

2. The secondary combustion chamber for solid waste treatment according to claim 1, characterized in that: The main pipe (22) is constructed as an arc-shaped pipe segment concentric with the housing (10), with both ends of the main pipe (22) closed and an air inlet flange (24) provided in the middle.

3. The secondary combustion chamber for solid waste treatment according to claim 2, characterized in that: One end of the branch pipe (23) is sealed with a flange blind plate.

4. The secondary combustion chamber for solid waste treatment according to claim 2, characterized in that: The branch pipes (23) all form an angle of 30°-45° with the radial direction of the housing (10).

5. A secondary combustion chamber for solid waste treatment according to claim 1, characterized in that: The closed-loop air device (20) is located above the air inlet (11).

6. The secondary combustion chamber for solid waste treatment according to claim 1, characterized in that: The lower part of the housing (10) is provided with a fire observation window (14).

7. A secondary combustion chamber for solid waste treatment according to claim 1, characterized in that: The upper part of the housing (10) is provided with an inspection door (15) next to the air outlet (12).

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