A system for screening of stale waste

Abstract

The utility model provides a kind of stale garbage screening system, comprising: feeding device;First screening device, the stale garbage conveyed by feeding device is screened;Second screening device, with first screening device by even material belt conveyor connection, first screen under thing is screened secondly;Primary air separator, with first screening device by second belt conveyor connection;Secondary air separator, with second screening device by third belt conveyor connection;Aggregate air separator, first heavy material and second heavy material are air selected, and sorting is large block light material and aggregate;Humus air separator, with second screening device by fourth belt conveyor connection.The utility model designs multistage air selection screening, and stale garbage is screened two levels, and each screening product is separately air selected, improves air selection effect, removes small piece of plastic mixed in humus, reduces the plastic rate of humus, and screening product is directly used as resource.

Description

Technical Field

[0001] This utility model relates to the field of aged waste treatment technology, specifically to an aged waste screening system. Background Technology

[0002] To improve the efficiency of municipal solid waste treatment and achieve the goals of "reduction, harmlessness, and resource recovery," various regions have successively launched the construction of municipal solid waste incineration power plants. Existing landfills have been gradually closed or, after reaching their design capacity, relocated or sealed off. Screening technology separates aged waste into lightweight combustibles, humus, and inorganic aggregates. Humus can be made into nutrient soil or organic fertilizer for landscaping, while inorganic aggregates can be used as local building materials, gravel for backfilling potholes, or as roadbed base materials. Lightweight combustibles are sent to incineration power plants for incineration power generation or processed into alternative fuels. However, the resource recovery of humus and inorganic aggregates requires ensuring the quality of humus and aggregate screening according to the specific resource recovery method. Therefore, existing technologies need further development. Utility Model Content

[0003] This utility model provides a screening system for aged waste, the specific implementation of which is as follows: A system for screening aged waste includes: The feeding device is used to receive the aged waste to be screened and supply it to the rear; The primary screening device screens the aged waste conveyed by the feeding device into primary undersize and primary oversize. The secondary screening device is connected to the primary screening device via a material equalization belt conveyor. It performs secondary screening on the primary undersize material, separating the primary undersize material into secondary undersize material and secondary oversize material. The primary air separator is connected to the primary screening device via a second belt conveyor, which separates the material on the primary screen into a first light material and a first heavy material. The secondary air separator is connected to the secondary screening device via a third belt conveyor, which separates the material on the secondary screen into a second light material and a second heavy material. An aggregate air classifier separates the first and second heavy materials into large lightweight materials and aggregates. The humus air separator is connected to the secondary screening device via a fourth belt conveyor to air separate the material undersize from the secondary screen.

[0004] Furthermore, a first magnetic separator is installed above the material conveyor belt between the primary screening device and the secondary screening device to separate the high-speed ferromagnetic material from other materials.

[0005] Furthermore, the aggregate air classifier is equipped with a second magnetic separation device at the aggregate outlet to separate high-speed ferromagnetic materials from other materials.

[0006] Furthermore, the primary air classifier, secondary air classifier, aggregate air classifier, and humus air classifier are all positive pressure air classifiers.

[0007] Furthermore, the positive pressure air separator is equipped with a rotary drum.

[0008] Furthermore, the primary screening device is a primary drum screen, and the screen aperture of the primary drum screen is 60-80mm.

[0009] Furthermore, the secondary screening device is a disc screen, and the effective aperture of the disc screen is 25-30mm.

[0010] Furthermore, the feeding device includes an excavator, a plate conveyor, and a uniform material distributor arranged in sequence.

[0011] Beneficial effects: 1. This utility model designs a multi-stage air separation screening system, which performs two-stage screening of aged waste, and each stage of screening products is separately air-separated. On the one hand, this can reduce the separation pressure of each stage air separator and improve the air separation effect. On the other hand, for aged waste that has been landfilled for a long time, some of the lightweight plastics in it have degraded, and there are many small pieces of plastic in the waste. The multi-stage air separation system can remove the small pieces of plastic mixed in the humus, reduce the plastic content of the humus, and allow the screening products to be directly utilized as resources.

[0012] 2. Magnetic separation devices are installed before the secondary separation and after the first and second heavy materials are separated by the aggregate air classifier to improve the collection efficiency of ferromagnetic materials.

[0013] 3. The air classifier is a positive pressure air classifier, equipped with a rotary drum, which can enhance the air classification effect of materials. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a screening system for aged waste according to this utility model; Figure 2 This is a structural schematic diagram of the primary air separator and the secondary air separator of this utility model; Figure 3 This is a structural schematic diagram of the feeding device, the primary screening device, and the primary air classifier of this utility model; Figure 4 This is a schematic diagram of the structure of the manual inspection of aggregates according to this utility model; Figure 5 This is a structural schematic diagram of the secondary screening device and the secondary air separator of this utility model; Figure 6 This is a structural schematic diagram of the aggregate air classifier of this utility model.

[0015] The above figures include the following reference numerals: 11. Plate conveyor; 12. Rotary drum screen feed belt conveyor; 13. Uniform distributor; 21. Primary rotary drum screen; 22. Rotary drum screen undersize transfer belt conveyor; 31. Disc screen; 32. Uniform material belt conveyor; 33. First magnetic separator; 34. Small piece lightweight material transfer belt conveyor; 35. Humus transfer belt conveyor; 36. Fourth belt conveyor; 41. Primary air separator; 42. Second belt conveyor; 43. Lightweight material collection belt conveyor; 51. Heavy material collection belt conveyor; 61. Secondary air separator; 62. Aggregate manual inspection platform; 63. Manual inspection collection belt conveyor; 64. Lightweight material collection belt conveyor; 65. Second magnetic separator; 66. Third belt conveyor; 67. Secondary air separator screen box; 68. Dustproof screen box; 71. Humus air separator; 72. Humus air separator screen box; 81. Aggregate air separator; 82. Aggregate air separator screen box. Detailed Implementation

[0016] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples: It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0017] Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0018] According to an embodiment of this utility model, a system for screening aged waste is provided. Please refer to [link / reference]. Figures 1 to 6The system includes: a feeding device for receiving and feeding aged waste to be screened; a primary screening device for screening the aged waste fed by the feeding device into primary undersize and primary oversize; a secondary screening device connected to the primary screening device via a conveyor belt 32 for secondary screening of the primary undersize into secondary undersize and secondary oversize; a primary air separator 41 connected to the primary screening device via a second conveyor belt 42 for separating the primary oversize into first light material and first heavy material; a secondary air separator 61 connected to the secondary screening device via a third conveyor belt 66 for separating the secondary oversize into second light material and second heavy material; an aggregate air separator 81 for air separation of the first heavy material and second heavy material into large light material and aggregate; and a humus air separator 71 connected to the secondary screening device via a fourth conveyor belt for air separation of the secondary undersize. This invention features a multi-stage air separation system that separates aged waste into two stages, with each stage's product undergoing separate air separation. This reduces the separation pressure on each stage air separator, improving the separation efficiency. Furthermore, for aged waste that has been in landfills for a long time, some of the lightweight plastics have degraded, resulting in a higher proportion of small plastic pieces. The multi-stage air separation system can remove these small plastic pieces mixed in with the humus, reducing the plastic content of the humus and allowing the screened products to be directly utilized as resources.

[0019] Above the conveyor belt 32 between the primary and secondary screening devices, a first magnetic separator 33 is installed to separate ferromagnetic materials from other materials. This separator intercepts ferromagnetic materials before the secondary screening process, preventing iron objects from entering the secondary screening device and causing equipment wear.

[0020] The aggregate air classifier 81 is equipped with a second magnetic separator 65 at the aggregate outlet to separate ferromagnetic materials from other materials. This provides deep iron removal from the final aggregate, resolving the problem of residual iron filings and preventing ferromagnetic materials from contaminating the aggregate and causing safety hazards during aggregate reuse. The second magnetic separator 65 can be an iron separator.

[0021] The primary air classifier 41, secondary air classifier 61, aggregate air classifier 81, and humus air classifier 71 are all positive pressure air classifiers, with the air inlets perpendicular to the direction of material descent, removing small pieces of lightweight plastic and flocculent matter from the material. Preferably, the positive pressure air classifier is equipped with a rotary drum, which tumbles and disperses the material and extends the material's residence time during air classification, thereby enhancing the material classification effect.

[0022] The primary screening device is a primary drum screen 21, with a screen aperture of 60-80mm. Firstly, the primary screening device performs primary screening to separate larger materials from the humus.

[0023] The secondary screening device is a disc sieve 31, with an effective aperture of 25-30 mm. The 25-30 mm aperture efficiently separates humus from small- to medium-sized aggregates, further improving the quality of the humus.

[0024] The feeding device includes an excavator, a plate conveyor 11, and a uniform distributor 13 arranged in sequence. Specifically, an excavator is responsible for feeding the material, spreading it evenly onto the receiving area of ​​the plate conveyor 11, and removing large interfering pieces. The material is then uniformly distributed by the uniform distributor 13 and transported to the primary screening device.

[0025] like Figure 1-6 As shown, the workflow of this utility model is as follows: 1. An excavator is responsible for feeding the material, spreading it evenly on the receiving area of ​​the plate conveyor 11, and picking out any large pieces of obstruction.

[0026] 2. For example Figure 3 As shown, the material is fed evenly to the drum screen feed conveyor 12 by the uniform feeder 13. The drum screen feed conveyor 12 transports the material to the primary drum screen 21. The primary undersize material smaller than the aperture of the primary drum screen 21 falls below and passes through the drum screen undersize transfer conveyor 22 and the uniform feed conveyor 32 to enter the secondary sorting. The primary oversize material enters the primary air classifier 41 through the second conveyor 42.

[0027] 3. For example Figure 2 As shown, the material on the primary screen of the primary drum screen 21 enters the primary air classifier 41 via the second belt conveyor 42. During the falling process, the material falls onto the rotary drum and is dispersed. High-pressure air blows over the material along the top of the rotary drum. The first light material is thrown obliquely upward under the action of high-pressure air and enters the light material collection chamber. The second heavy material bounces back through the rotary drum and falls onto the heavy material collection belt conveyor 51.

[0028] 4. For example Figure 5 As shown, the primary undersize material from the primary drum screen enters the secondary screening device, the disc screen 31, via the equalizing conveyor belt 32. Secondary undersize material smaller than the aperture of the disc screen 31 falls onto the fourth conveyor belt 36 below. The oversize material from the secondary screen enters the secondary air separator 61 via the third conveyor belt 66. Before entering the disc screen 31, the material passes through a first magnetic separator 33 to remove ferromagnetic materials. The first magnetic separator 33 can be an iron remover.

[0029] 5. The material oversized from the secondary screen enters the secondary air separator 61. During the descent, the material falls onto the rotating drum and is dispersed. High-pressure air blows over the material above the rotating drum. The second lightest material is thrown upwards at an angle by the high-pressure air and enters the light material collection chamber. The second heaviest material bounces back onto the heavy material collection conveyor belt 51 after passing through the rotating drum. The secondary air separator 61 has a secondary air separator screen box 67 and a dustproof screen box 68. The secondary air separator screen box 67 uses a 20x20mm wire mesh to connect the air diffusers of the primary air separator 41 and the secondary air separator 61. Connecting the air diffusers of the primary air separator 41 and the secondary air separator 61 with a set of screen boxes increases the air diffusion area, enabling rapid air diffusion, reducing air pressure, and preventing turbulence of the high-pressure air in the air chamber. The lightest material in the air chamber can smoothly pass through the air chamber and fall onto the light material collection conveyor belt 43. The dustproof mesh box 68 can effectively intercept small pieces of lightweight material and small-diameter particles that escape from the secondary air separation mesh box 67. After these small pieces of lightweight material and small-diameter particles are intercepted, they fall into a fixed area, which can effectively reduce the dust concentration in the air separation working area.

[0030] 6. The material passing through the secondary screen of the disc screen is humus. The humus passes through a humus air separator 71, which blows out small, lightweight pieces. The purified humus falls onto a humus transfer conveyor belt 35 and is transported to the humus collection silo. Small, lightweight pieces of humus are then transported by a small lightweight piece transfer conveyor belt 34. The humus air separator 71 includes a humus air separator screen box 72.

[0031] 7. The inorganic aggregates separated by the primary air classifier 41 and the secondary air classifier 61 are then separated by the aggregate air classifier 81 to remove any lightweight materials mixed in with the aggregates. For example... Figure 4 As shown, an aggregate manual inspection platform 62 is provided. Remaining aggregate undergoes further manual inspection on this platform 62 to separate out large, lightweight materials that were not separated by air separation, resulting in pure inorganic aggregate. Specifically, the lightweight materials mixed in with the aggregate are collected by the aggregate air separator 81 via a lightweight material collection conveyor belt 43. The large, lightweight materials separated by manual inspection are collected and transported via the large manual inspection collection conveyor belt 63 and the lightweight material collection conveyor belt 64. Figure 6 As shown, the aggregate air classifier 81 has an aggregate air classifier screen box 82.

[0032] Many other changes and modifications can be made without departing from the concept and scope of this utility model. It should be understood that this utility model is not limited to the specific embodiments, and the scope of this utility model is defined by the appended claims.

Claims

1. A system for screening of compostable waste, characterized in that, include: The feeding device is used to receive the aged waste to be screened and supply it to the rear; The primary screening device screens the aged waste conveyed by the feeding device into primary undersize and primary oversize. The secondary screening device is connected to the primary screening device via a material equalization belt conveyor. It performs secondary screening on the primary undersize material, separating the primary undersize material into secondary undersize material and secondary oversize material. The primary air separator is connected to the primary screening device via a second belt conveyor, which separates the material on the primary screen into a first light material and a first heavy material. The secondary air separator is connected to the secondary screening device via a third belt conveyor, which separates the material on the secondary screen into a second light material and a second heavy material. An aggregate air classifier separates the first and second heavy materials into large lightweight materials and aggregates. The humus air separator is connected to the secondary screening device via a fourth belt conveyor to air separate the material undersize from the secondary screen.

2. The stale garbage screening system of claim 1, wherein, Above the material conveyor belt between the primary screening device and the secondary screening device, a first magnetic separator is installed to separate high-speed ferromagnetic materials from other materials.

3. The stale garbage screening system of claim 1, wherein, The aggregate air classifier is equipped with a second magnetic separator at the aggregate outlet to separate high-speed ferromagnetic materials from other materials.

4. The stale garbage screening system of claim 1, wherein, The primary air classifier, secondary air classifier, aggregate air classifier, and humus air classifier are all positive pressure air classifiers.

5. The mastication refuse screening system of claim 4, wherein, The positive pressure air separator is equipped with a rotary drum.

6. The matted waste screening system of claim 1, wherein, The primary screening device is a primary drum screen, and the screen aperture of the primary drum screen is 60-80mm.

7. The stale garbage screening system of claim 1, wherein, The secondary screening device is a disc screen, and the effective aperture of the disc screen is 25-30mm.

8. The stale garbage screening system of claim 1, wherein, The feeding device includes an excavator, a plate conveyor, and a uniform material distributor arranged in sequence.

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