A waste incineration fly ash stabilizing device

Abstract

This utility model discloses a waste incineration fly ash stabilization device, relating to the field of waste treatment technology. It includes a mixing tank and a fly ash feeding structure connected to the top of the mixing tank. A screening structure is provided on the fly ash feeding structure to achieve the screening of magnetic substances in the fly ash. This waste incineration fly ash stabilization device can effectively screen and collect magnetic substances in fly ash, achieving efficient resource recovery of fly ash.

Description

Technical Field

[0001] This utility model relates to the field of waste treatment technology, specifically to a fly ash stabilization device for waste incineration. Background Technology

[0002] In the current waste management industry, waste incineration is a widely used method for waste reduction and harmless treatment. However, the incineration process produces a large amount of fly ash, which contains toxic and harmful substances such as heavy metals and dioxins. It is classified as hazardous waste and must be stabilized before it can be safely landfilled.

[0003] Stabilization treatment involves adding chelating agents to fly ash, mixing the fly ash with the chelating agents to form a solidified body with certain strength and stability, thereby reducing the leaching toxicity of harmful substances in the fly ash and achieving safe disposal.

[0004] However, fly ash contains magnetic metal oxides such as iron and nickel, which have recycling value. Traditional stabilization devices lack dedicated screening structures or only use fixed magnetic separators. Fixed magnetic separators can only adsorb magnetic substances flowing over their surface. When the fly ash flow rate is high, magnetic substances may be missed because they do not come into contact with the magnetic separator, failing to meet the requirements for efficient resource recovery. Utility Model Content

[0005] The purpose of this invention is to provide a fly ash stabilization device for waste incineration. This fly ash stabilization device can effectively screen and collect magnetic materials in fly ash, thereby achieving efficient resource recovery of fly ash.

[0006] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a waste incineration fly ash stabilization device, including a mixing tank and a fly ash feeding structure, wherein the fly ash feeding structure is connected to the top of the mixing tank;

[0007] A screening structure is provided on the fly ash feeding structure to achieve the screening of magnetic substances in fly ash.

[0008] In some embodiments, the fly ash feeding structure includes a flow pipe, which is vertically arranged and its top is connected to the top of the mixing tank, and the screening structure is provided on one side wall of the flow pipe;

[0009] A feeding fan is located at the bottom of the flow pipe.

[0010] In some embodiments, the screening structure includes a screening chamber, which is disposed on one side wall of the fly ash feeding structure;

[0011] A screening port is provided between the screening bin and the fly ash feeding structure;

[0012] A fixed shaft is provided at the screening port;

[0013] The magnetic separation plates are arranged in a ring and rotatably mounted on the fixed shaft, and are slidably connected to the inner wall of the fly ash feeding structure on the side away from the screening port.

[0014] In some embodiments, the screening structure further includes a rotating ring, which is coaxially disposed on the fixed shaft, and one side of the magnetic separation plate passes through the rotating ring and is rotatably connected to the fixed shaft;

[0015] The fixed shaft includes an insulating part, which is located on the side of the screening port near the screening chamber.

[0016] A power-conducting part is located on the side of the screening port away from the screening chamber;

[0017] The magnetic separator is an electromagnet.

[0018] In some embodiments, the rotating ring is made of an insulating material.

[0019] In some embodiments, the screening structure further includes a lifting groove, which is disposed at the bottom of the screening port;

[0020] A scraper, which is slidably disposed within the lifting groove;

[0021] A reset spring is provided between the scraper and the bottom wall of the lifting groove.

[0022] In some embodiments, the energized portion is one-third to one-fifth of the fixed shaft.

[0023] In some embodiments, the screening structure further includes a plurality of air nozzles, which are equally spaced on the screening port and the air outlet direction of the air nozzles is obliquely upward.

[0024] In some embodiments, the mixing tank includes a liquid inlet, which is located at the top of the mixing tank;

[0025] A fly ash inlet is provided at the top of the mixing tank and connected to the fly ash feeding structure.

[0026] An electric motor is located at the top of the mixing tank;

[0027] A stirring assembly, which is rotatably mounted on the stirring tank and connected to the output shaft of the motor;

[0028] An outlet valve is located at the bottom of the mixing tank;

[0029] A water inlet pipe is located at the top of the mixing tank.

[0030] In summary, this utility model has the following beneficial effects:

[0031] This type of waste incineration fly ash stabilization device, through multiple rotating magnetic separation plates, can achieve intermittent partitioning within the flow pipe, increasing the contact area between the magnetic separation plates and the fly ash, ensuring that the fly ash can fully contact the magnetic separation plates as it flows through, thereby improving the magnetic separation effect, efficiently removing magnetic substances mixed in the fly ash, and collecting them, thus achieving efficient resource recovery of fly ash. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of the present invention;

[0033] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0034] Figure 3 This utility model Figure 1 Enlarged view of point B in the middle.

[0035] In the diagram: 1. Mixing tank; 11. Liquid inlet; 12. Fly ash inlet; 13. Motor; 14. Mixing assembly; 15. Outlet valve; 2. Fly ash feeding structure; 21. Flow pipe; 22. Feeding fan; 3. Screening structure; 31. Screening bin; 32. Screening port; 33. Fixed shaft; 331. Insulation part; 332. Power-conducting part; 34. Magnetic separation plate; 35. Rotating ring; 36. Lifting trough; 37. Scraper; 38. Return spring; 39. Air nozzle. Detailed Implementation

[0036] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] refer to Figure 1-3A waste incineration fly ash stabilization device includes a mixing tank 1, a fly ash feeding structure 2, and a screening structure 3. The mixing tank 1 is the core container of the entire device, used to contain fly ash and chelating agents, and to mix them to form a sludge-like solid. The mixing tank 1 can be made of alloy steel, which has good mechanical properties and chemical stability, ensuring that the mixing tank will not deform or corrode during long-term use, thus ensuring the safe operation of the device. The fly ash feeding structure 2 is connected to the top of the mixing tank 1 to realize the conveying of fly ash. The screening structure 3 is located on the fly ash feeding structure 2 to realize the screening and recovery of magnetic materials in the fly ash.

[0038] In some embodiments, the fly ash feeding structure 2 includes a flow pipe 21 and a feeding fan 22. The flow pipe 21 is vertically arranged and its top is connected to the top of the mixing tank 1. A screening structure 3 is provided on one side wall of the flow pipe 21. The flow pipe 21 can be made of stainless steel and its cross-section can be square. The feeding fan 22 is located at the bottom of the flow pipe 21. The airflow generated by the feeding fan 22 transports the fly ash into the flow pipe 21. The fly ash agglomeration is initially reduced by the airflow dispersion effect and then transported upward to the mixing tank 1 to realize the feeding of fly ash.

[0039] In some embodiments, the screening structure 3 includes a screening chamber 31, a screening port 32, a fixed shaft 33, and a magnetic separation plate 34. The screening chamber 31 is disposed on one side wall of the flow pipe 21 and can be welded and fixed. It is used to collect the screened magnetic materials. The bottom of the screening chamber 31 may be provided with a recovery port, which is sealed with a recovery plate. The recovery port can be opened and closed through the recovery plate, thereby realizing the recovery of materials in the screening chamber 31. This is prior art and will not be described in detail here. The screening chamber 31 may be made of stainless steel. The screening port 32 is located between the screening chamber 31 and the flow pipe 21, allowing magnetic materials to enter the screening chamber 31 from the flow pipe 21. The channel has a fixed shaft 33 located at the screening port 32, which provides rotational support for the magnetic separation plate 34. Multiple magnetic separation plates 34 are arranged in a ring and rotatably mounted on the fixed shaft 33, and are slidably connected to the inner wall of the fly ash feeding structure 2 away from the screening port 32. By rotating the multiple magnetic separation plates 34, intermittent partitioning can be achieved in the flow pipe 21, increasing the contact area between the magnetic separation plate 34 and the fly ash, ensuring that the fly ash can fully contact the magnetic separation plate 34 when it flows through, thereby improving the magnetic separation effect and thus improving the resource recovery rate. The magnetic separation plate 34 can be made of silicon steel sheet, which has high magnetic permeability and low iron loss, and can improve the magnetic properties and efficiency of the magnetic separation plate 34.

[0040] In some embodiments, the screening structure 3 further includes a rotating ring 35, which is coaxially mounted on the fixed shaft 33. One side of the magnetic separation plate 34 passes through the rotating ring 35 and is rotatably connected to the fixed shaft 33. The rotating ring 35 can realize the fixed connection between multiple magnetic separation plates 34, ensuring the stability of their ring arrangement.

[0041] The fixed shaft 33 includes an insulating part 331 and an energized part 332. The insulating part 331 is located on the side of the screening port 32 near the screening chamber 31 and can be made of polytetrafluoroethylene (PTFE). The energized part 332 is located on the side of the screening port 32 away from the screening chamber 31 and can be made of a highly conductive metal such as copper. The energized part 332 can be connected to an external power source via a carbon brush and slip ring. The magnetic separator 34 uses an electromagnet. Only when rotating to the area of ​​the energized part 332 does the magnetic separator 34 come into contact with the energized part 332 and generate magnetism, thus adsorbing magnetic substances in the fly ash. When rotating to the area of ​​the insulating part 331, it loses magnetism, facilitating the removal of magnetic substances.

[0042] In some embodiments, the rotating ring 35 may be made of insulating materials such as nylon or polytetrafluoroethylene, which can effectively isolate current, avoid current conduction interference when the magnetic separation plate 34 is energized, and ensure that the magnetism of each magnetic separation plate 34 is independent and controllable.

[0043] In some embodiments, the screening structure 3 further includes a lifting groove 36, a scraper 37, and a return spring 38. The lifting groove 36 is located at the bottom of the screening port 32. The scraper 37 is slidably disposed in the lifting groove 36, with its top surface in contact with the surface of the magnetic separation plate 34. The scraper 37 may be made of polyurethane. One end of the return spring 38 is connected to the bottom of the scraper 37, and the other end is fixed to the bottom wall of the lifting groove 36. The scraper 37 is pushed by elastic force to always keep in close contact with the magnetic separation plate 34. When the magnetic separation plate 34 rotates to one side of the screening chamber 31, the magnetic material adsorbed on its surface is scraped off into the screening chamber 31.

[0044] In some embodiments, the energized part 332 is one-third to one-fifth of the fixed shaft 33, and is energized only when the magnetic separation plate 34 is inserted into the flow tube 21 to generate magnetism, ensuring that the magnetic material is only adsorbed in the flow tube 21 and loses magnetism and falls off when it is inserted into the screening chamber 31, thereby reducing the problem of incomplete recovery caused by secondary adsorption of magnetic material.

[0045] In some embodiments, the screening structure 3 further includes multiple air nozzles 39, which are equally spaced on the screening port 32 and can be located on the two side walls of the screening port 32. While not affecting the rotation of the magnetic separation plate 34, they can blow away the fly ash. The air outlet direction of the air nozzles 39 is set obliquely upward. The multiple air nozzles 39 are connected to an external air source (such as a blower). Through the action of the air nozzles 39, the fly ash between the two magnetic separation plates 34 can flow upward along the flow pipe 21 and be transported into the mixing tank 1. The air force of the air nozzles 39 can be greater than the weight of the fly ash and less than the sum of the weight of the magnetic material itself and the attraction between the magnetic material and the magnetic separation plate 34, thereby ensuring the separation of the magnetic core material from the fly ash and preventing the fly ash from entering the screening chamber 31.

[0046] In some embodiments, the mixing tank 1 includes a liquid inlet 11, a fly ash inlet 12, a motor 13, a stirring assembly 14, and an outlet valve 15. The liquid inlet 11 is located at the top of the mixing tank 1 and can be connected to an external liquid delivery device. The external liquid delivery device may include a storage tank, a delivery pump, a solenoid valve, etc., and can add a set amount of chelating agent to the mixing tank 1. Common chelating agents mainly consist of one of ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and sodium dimethyl dithiocarbamate, which can be selected according to actual conditions. This is prior art and will not be described in detail here; fly ash inlet 12 Located at the top of the mixing tank 1 and connected to the fly ash feeding structure 2, it enables the addition of fly ash. The motor 13 is located at the top of the mixing tank 1, and the stirring assembly 14 is rotatably located in the mixing tank 1 and connected to the output shaft of the motor 13. The stirring assembly 14 may include a stirring rod and stirring blades. The motor 13 drives the stirring assembly 14 to rotate, stirring and mixing the fly ash and chelating agent in the mixing tank 1, so that the fly ash and chelating agent are fully mixed, thereby stabilizing the fly ash. The outlet valve 15 is located at the bottom of the mixing tank 1 and can control the discharge of muddy solids. The outlet valve 15 can be a solenoid valve, which is existing technology and will not be described in detail here.

[0047] The specific working principle is as follows:

[0048] During operation, the feeding fan 22 conveys fly ash into the flow pipe 21. Under the action of airflow, the fly ash moves upward. When it passes through the screening structure 3, the magnetic separation plate 34 in contact with the fly ash is released from the energized part 332. When energized, it generates magnetism and adsorbs magnetic substances in the fly ash. Since the magnetic separation plate 34 is annular and rotatably mounted on the fixed shaft 33, under the impact of the fly ash and its own rotation, the magnetic separation plate 34 will continuously rotate, so that the adsorbed magnetic substances are evenly distributed on the surface of the magnetic separation plate 34.

[0049] When the magnetic separator 34 rotates to the screening chamber 31, it disengages from the insulation part 331, is de-energized, and loses its magnetism. The adsorbed magnetic material falls into the screening chamber 31 under gravity. At the same time, the magnetic separator 34 continues to rotate and disengages from the scraper 37. During the rotation, the magnetic separator 34 will squeeze the scraper 37, causing it to move downwards. The return spring 38 deforms, scraping off the residual magnetic material on the magnetic separator 34, ensuring the cleanliness of the magnetic separator 34 and preparing for the next magnetic attraction. When the magnetic separator 34 continues to rotate into the flow tube 21, it separates from the scraper 37, the return spring 38 returns to its original position, and the scraper 37 rises to contact the next magnetic separator 34.

[0050] After screening, the fly ash enters the mixing tank 1 through the fly ash inlet 12, while the chelating agent enters the mixing tank 1 through the liquid inlet 11 at a set ratio. The motor 13 drives the stirring assembly 14 to rotate, thoroughly stirring and mixing the materials in the mixing tank 1, so that the fly ash and chelating agent are evenly mixed to form a mud-like solid. Finally, the outlet valve 15 is opened to discharge the mud-like solid from the discharge device.

[0051] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fly ash stabilization device for waste incineration, comprising a mixing tank (1), characterized in that: It also includes a fly ash feeding structure (2), which is connected to the top of the mixing tank (1); The screening structure (3) is located on the fly ash feeding structure (2) and can screen magnetic materials in fly ash.

2. The fly ash stabilization device for waste incineration according to claim 1, characterized in that: The fly ash feeding structure (2) includes a flow pipe (21), which is vertically arranged and the top of the flow pipe (21) is connected to the top of the mixing tank (1), and the screening structure (3) is provided on one side wall of the flow pipe (21). Feeding blower (22) is located at the bottom of the flow pipe (21).

3. The fly ash stabilization device for waste incineration according to claim 1, characterized in that: The screening structure (3) includes a screening chamber (31), which is located on one side wall of the fly ash feeding structure (2); Screening port (32), the screening port (32) is located between the screening bin (31) and the fly ash feeding structure (2); A fixed shaft (33) is provided at the screening port (32); Magnetic separation plate (34), multiple magnetic separation plates (34) are arranged in a ring and rotatably mounted on the fixed shaft (33), and are slidably connected to the inner wall of the fly ash feeding structure (2) on the side away from the screening port (32).

4. The fly ash stabilization device for waste incineration according to claim 3, characterized in that: The screening structure (3) further includes a rotating ring (35), which is coaxially mounted on the fixed shaft (33), and one side of the magnetic separation plate (34) passes through the rotating ring (35) and is rotatably connected to the fixed shaft (33); The fixed shaft (33) includes an insulating part (331), which is located on the side of the screening port (32) near the screening chamber (31). A power supply unit (332) is provided on the side of the screening port (32) away from the screening chamber (31); The magnetic separation plate (34) is an electromagnet.

5. The fly ash stabilization device for waste incineration according to claim 4, characterized in that: The rotating ring (35) is made of insulating material.

6. The fly ash stabilization device for waste incineration according to claim 3, characterized in that: The screening structure (3) also includes a lifting groove (36), which is located at the bottom of the screening port (32); Scraper (37), the scraper (37) is slidably disposed in the lifting groove (36); A reset spring (38) is provided between the scraper (37) and the bottom wall of the lifting groove (36).

7. The fly ash stabilization device for waste incineration according to claim 4, characterized in that: The energized part (332) is one-third to one-fifth of the fixed shaft (33).

8. A waste incineration fly ash stabilization device according to claim 3, characterized in that: The screening structure (3) also includes multiple air nozzles (39), which are equally spaced on the screening port (32), and the air outlet direction of the air nozzles (39) is set obliquely upward.

9. The fly ash stabilization device for waste incineration according to claim 1, characterized in that: The mixing tank (1) includes a liquid inlet (11), which is located at the top of the mixing tank (1); Fly ash inlet (12), the fly ash inlet (12) is located at the top of the mixing tank (1) and is connected to the fly ash feeding structure (2); Motor (13), the motor (13) is located on the top of the mixing tank (1); A stirring assembly (14) is rotatably mounted on the stirring tank (1) and connected to the output shaft of the motor (13). An outlet valve (15) is located at the bottom of the mixing tank (1).

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