Municipal solid waste resource regeneration and comprehensive utilization system and method

Abstract

The invention provides a municipal solid waste resource regeneration comprehensive utilization system which comprises a crusher, a dryer, a rotary carbonization furnace, a cooling conveyor and a gravity sorting machine which are connected in sequence, the top of the crusher is provided with a crusher feeding end, and the bottom of the gravity sorting machine is provided with a plurality of gravity sorting machine discharging ports; the urban household garbage resource regeneration comprehensive utilization system further comprises a combustible gas collecting device, the rotary carbonization furnace is further provided with a rotary carbonization furnace gas outlet end, and the combustible gas collecting device is connected with the rotary carbonization furnace gas outlet end through a pipeline. And the rotary carbonization furnace is also connected with a carbonization furnace heating device. After the technical scheme is adopted, the municipal solid waste can be carbonized into the carbon-based material and the combustible gas, and various recoverable materials are sorted from the carbon-based material, so that the secondary pollution in the waste treatment process is effectively avoided while the resource recycling is realized, and the harmless treatment of the municipal solid waste is realized.

Description

Technical Field

[0001] This invention relates to the field of waste treatment technology, and more particularly to a waste treatment device and method, and more specifically, to a comprehensive system and method for the recycling and utilization of urban domestic waste resources. Background Technology

[0002] With the rapid development of my country's economy and urban construction, the urban population is constantly increasing, industrialization is progressing, and people's living standards are continuously improving. Consequently, the amount of general solid waste generated is also increasing daily. In the process of urbanization, general solid waste, as a byproduct of urban metabolism, has become a burden on urban development, causing increasingly serious harm to the environment and the human ecological environment. Therefore, the environmentally friendly and economical treatment of general solid waste has become an extremely urgent task.

[0003] Current methods for urban household waste disposal primarily rely on landfill and incineration. Landfills, as the final disposal method for household waste in my country, have always played an indispensable role in urban and rural waste management. However, they also have many drawbacks: they occupy large amounts of land, waste significant amounts of resources contained in the waste, cause serious environmental pollution, and suffer from inadequate post-disposal management. Waste incineration can rapidly reduce waste volume, but it also has serious drawbacks: Urban household waste in my country is high in organic matter, has a high water content, and a low calorific value, making it difficult to reach ideal high temperatures during incineration. Furthermore, it contains a large amount of plastic bags and food containers, making it more prone to producing dioxins during incineration. At the same time, the toxic pollutants generated during incineration are not eliminated by exhaust emission control technologies. Exhaust gas filtration and control can only transfer pollutants to the fly ash and slag produced during incineration, still posing a pollution risk.

[0004] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art: Both landfill and incineration methods of waste disposal generate secondary pollution during the process, failing to achieve complete environmental protection. Therefore, reducing or eliminating secondary pollution and achieving harmless treatment are crucial issues that need to be addressed to better protect the environment. Summary of the Invention

[0005] This invention provides a comprehensive system and method for the recycling and utilization of urban domestic waste, which addresses the problems of secondary pollution and the inability to achieve harmless treatment in existing waste disposal processes.

[0006] To achieve the above objectives, in one aspect, embodiments of the present invention provide a comprehensive urban waste recycling system, comprising a crusher, a dryer, a rotary carbonization furnace, a cooling conveyor, and a gravity separator connected in sequence. The crusher has a feed end at its top, and the gravity separator has multiple discharge ports at its bottom. The comprehensive urban waste recycling system also includes a combustible gas collection device, and the rotary carbonization furnace has a gas outlet. The combustible gas collection device is connected to the gas outlet via a pipeline. The rotary carbonization furnace is also connected to a carbonization furnace heating device.

[0007] Furthermore, a first conveyor is connected between the crusher and the dryer; a magnetic separator is also provided above the first conveyor, the horizontal projection of the magnetic separator coincides with the horizontal projection of the first conveyor, and the distance between the bottom surface of the magnetic separator and the surface of the conveyor belt of the first conveyor is less than the magnetic force range of the magnetic separator.

[0008] Furthermore, the direction of the conveyor belt of the magnetic separator is perpendicular to the direction of the conveyor belt of the first conveyor.

[0009] Furthermore, an eddy current separator is connected between the cooling conveyor and the gravity separator; the bottom of the eddy current separator is provided with a non-ferrous metal discharge end and an eddy current separator discharge end, and the eddy current separator discharge end is connected to the gravity separator.

[0010] Furthermore, a second conveyor and an airlock are connected in sequence between the dryer and the rotary carbonization furnace.

[0011] Furthermore, the air inlet pipe of the carbonization furnace heating device is connected to the combustible gas collection device.

[0012] Furthermore, the rotary carbonization furnace and the dryer are connected by a waste heat recovery pipeline.

[0013] Furthermore, the urban domestic waste resource recycling and comprehensive utilization system also includes an exhaust gas purification device, which is connected to the dryer.

[0014] On the other hand, embodiments of the present invention also provide a method for comprehensive utilization of urban domestic waste through resource recycling. This method employs the aforementioned comprehensive utilization system for urban domestic waste through resource recycling, and the method includes: The municipal solid waste to be processed is fed into the feed end of the crusher to obtain crushed material; The crushed material is transferred into the dryer and dried by the dryer to obtain the dried material. The dried material is carbonized using the rotary carbonization furnace to obtain combustible gas and carbon-based material. The combustible gas is introduced into the combustible gas collection device; The carbon-based material is cooled by the cooling conveyor and then fed into the gravity separator. The cooled carbon-based material is sorted by the gravity separator, and several types of recyclable carbon-based materials obtained after sorting are output from the corresponding outlet of the gravity separator.

[0015] Furthermore, in step S3, the carbonization temperature is set to 480℃~550℃, and the carbonization time is set to 18~22min, preferably 20min.

[0016] The above technical solution has the following beneficial effects: This technical solution utilizes the carbonization process of dried municipal solid waste to obtain carbon-based materials and combustible materials. Various recyclables are then separated from the carbon-based materials. This avoids the emissions of dioxins, sulfur dioxide, hydrogen sulfide, and nitrogen oxides produced by existing incineration technologies, as well as the land occupation and heavy metal pollution problems caused by landfill treatment. Therefore, it effectively prevents secondary pollution during waste treatment, achieves the harmless treatment of municipal solid waste, and greatly promotes environmental protection.

[0017] In addition, this technical solution also has the following characteristics: In this technical solution, the calorific value of the combustible gas obtained after carbonization is higher than 8000 kcal, which is a new type of clean and renewable energy. At the same time, various recyclable materials such as metals, glass, sand, and ceramics are separated from the carbon base material, which have high economic value. Thus, efficient direct and reverse utilization of waste resources is achieved, with a resource utilization rate of nearly 100%. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a comprehensive utilization system for urban domestic waste recycling according to an embodiment of the present invention; Figure 2 This is a flowchart of a method for comprehensive utilization and recycling of urban domestic waste according to an embodiment of the present invention; Figure 3This is a schematic diagram of the structure of the conveyor (including a first conveyor and a second conveyor) in an embodiment of the present invention; Figure 4 This is a schematic diagram of the magnetic separator in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the crusher in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the waste gas purification device in an embodiment of the present invention; Figure 7 This is a schematic diagram of the dryer in an embodiment of the present invention; Figure 8 This is a schematic diagram of the airlock device in an embodiment of the present invention; Figure 9 This is a schematic diagram of the rotary carbonization furnace in an embodiment of the present invention; Figure 10 This is a schematic diagram of the cooling conveyor in an embodiment of the present invention; Figure 11 This is a schematic diagram of the gravity sorting machine in an embodiment of the present invention; Figure 12 This is a schematic diagram of the eddy current separator in an embodiment of the present invention; Figure 13 This is a schematic diagram of the structure of the carbonization furnace heating device in an embodiment of the present invention; Figure 14 This is a schematic diagram of the combustible gas collection device in an embodiment of the present invention; Reference numerals: 1. First conveyor; 2. Magnetic separator; 3. Crusher; 4. Waste gas purification device; 5. Dryer; 6. Second conveyor; 7. Airlock; 8. Rotary carbonization furnace; 9. Cooling conveyor; 10. Gravity separator; 11. Eddy current separator; 12. Carbonization furnace heating device; 13. Combustible gas collection device; 14. Waste heat recovery pipeline; 101. Conveyor main unit; 102. Conveyor feed end; 103. Conveyor discharge end; 301. Crusher main unit; 302. Crusher feed end; 303. Crusher discharge end; 401. Dust removal device 401A, Dust collector input end; 401B, Dust collector output end; 402, Spray tower; 402A, Spray tower input end; 402B, Spray tower output end; 403, UV integrated machine; 403A, UV integrated machine input end; 403B, UV integrated machine output end; 404, Fan; 405, Chimney; 501, Dryer main unit; 502, Dryer feed end; 503, Dryer discharge end; 504, Dryer exhaust port; 505, Dryer air inlet; 701, Airlock main unit; 702, Airlock feed end; 703, Airlock... 801. Carbonization furnace main unit; 802. Carbonization furnace feed end; 803. Carbonization furnace discharge end; 804. Carbonization furnace exhaust end; 805. Flue gas outlet; 806. Heating port; 901. Cooling conveyor main unit; 902. Cooling conveyor feed end; 903. Cooling conveyor discharge end; 1001. Gravity separator main unit; 1002. Gravity separator feed end; 1003. Gravity separator discharge port; 1101. Eddy current separator main unit; 1102. Eddy current separator feed end; 1103. Eddy current separator discharge end; 1104. 1201 Non-ferrous metal discharge end; 1202 Main heating device; 1203 Inlet pipe connection end; 1204 Combustion end; 1301 Cyclone dust collector main unit; 1301A Cyclone dust collector inlet end; 1301B Cyclone dust collector outlet end; 1302 Gas purification separator; 1302A Purification separator input end; 1302B Purification separator output end; 1303 Gas storage tank; 1303A Gas storage tank inlet end; 1303B Gas storage tank outlet end; 1303C First standby end of gas storage tank; 1303D Second standby end of gas storage tank. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To address the aforementioned issues, this technical solution departs from existing waste incineration or landfill processes. Instead, the waste is crushed to a predetermined size using a crusher 3, the crushed material is dried, and then subjected to high-temperature carbonization to form carbon-based materials (with combustible gas as a byproduct). This avoids the emissions of dioxins, sulfur dioxide, hydrogen sulfide, and nitrogen oxides produced by existing incineration technologies, as well as the land occupation and heavy metal pollution problems caused by landfilling. Therefore, it effectively prevents secondary pollution during waste treatment, achieving harmless treatment of municipal solid waste and significantly promoting environmental protection. Furthermore, gravity separation technology can further separate various recyclable materials from the carbon-based materials, such as glass, sand, and ceramics, enabling resource recycling and reuse.

[0022] Under this line of thinking, such as Figure 1 As shown in the figure, the system structure of a comprehensive utilization system for urban domestic waste recycling according to an embodiment of the present invention is as follows: Figure 1 As shown, it includes a crusher 3, a dryer 5 (preferably a rotary dryer), a rotary carbonization furnace 8, a cooling conveyor 9, and a gravity separator 10 connected in sequence. The crusher 3 has a crusher feed end 302 at the top for inputting the waste material to be processed. The gravity separator 10 has multiple gravity separator discharge ports 1003 at the bottom for outputting the sorted waste materials such as metals, glass, sand, and ceramics. These materials can then be collected and packaged. Simultaneously, due to the carbonization process of the waste... In addition to carbon-based materials, the produced products also include combustible gas (mainly natural gas). Therefore, the system is also equipped with a combustible gas collection device 13, which is specifically connected to the gas outlet 804 of the rotary carbonization furnace through a pipeline. The cooling conveyor 9 is located between the rotary carbonization furnace 8 and the gravity separator 10 and is used to cool the high-temperature carbon-based materials obtained after carbonization. In addition, the rotary carbonization furnace 8 is also connected to a carbonization furnace heating device 12 to provide sufficient heat to the rotary carbonization furnace 8 to complete the carbonization process of the material.

[0023] Furthermore, since waste materials usually contain scrap iron and other substances, a magnetic separator 2 is installed in the system for recycling. In order to ensure that the magnetic separator 2 has sufficient operating space, the crusher 3 and the dryer 5 in the system are not directly connected. Instead, a first conveyor 1 is added between the two. At this time, the magnetic separator 2 is placed above the first conveyor 1, and the directions of the two conveyor belts are arranged perpendicular to each other. This allows the scrap iron in the crushed material to be attracted by the magnetic separator 2 and separated as the material moves with the conveyor belt.

[0024] Furthermore, the waste material may also contain non-ferrous metal scrap. In order to recycle it, an eddy current separator 11 is added between the cooling conveyor 9 and the gravity separator 10 to screen out non-ferrous metals such as copper and aluminum from the waste.

[0025] Furthermore, by connecting the gas inlet pipe connection end 1202 of the carbonization furnace heating device 12 to the gas outlet end 1303B of the gas storage tank of the combustible gas collection device 13, the recovered natural gas can be used to provide heat energy to the rotary carbonization furnace 8, thereby reducing fuel consumption.

[0026] Furthermore, as shown in the figure, to reduce fuel consumption, the rotary carbonization furnace 8 can be connected to the dryer 5 via a waste heat recovery pipe 14. Specifically, one end of the waste heat recovery pipe 14 is connected to the exhaust port 805 of the rotary carbonization furnace 8, and the other end is connected to the air inlet 505 of the dryer, thus using the waste gas from the rotary carbonization furnace 8 to provide heat for the dryer 5. Then, the dust removal device input end 401A is connected to the dryer exhaust port 504, thereby using the exhaust gas purification device 4 to eliminate pollutant particles in the flue gas and achieve emission standards.

[0027] like Figure 2 As shown in the figure, this embodiment of the invention also provides a method for comprehensive utilization of urban domestic waste through resource recycling, which adopts the urban domestic waste resource recycling system described above, and the method includes: S1. The municipal solid waste to be processed is fed into the feed end 302 of the crusher to obtain crushed material; S2. The crushed material is transferred to the dryer 5 and dried by the dryer 5 to obtain the dried material. S3. The dried material is carbonized using the rotary carbonization furnace 8 to obtain combustible gas and carbon-based material. S4. Introduce the combustible gas into the combustible gas collection device 13; S5. The carbon-based material is cooled by the cooling conveyor 9 and then fed into the gravity separator 10. S6. The cooled carbon-based material is sorted by the gravity separator 10, and several kinds of recyclable carbon-based materials obtained after sorting are output from the corresponding gravity separator outlet 1003.

[0028] Furthermore, during the carbonization operation in step S3, the carbonization temperature is 480℃~550℃ and the carbonization time is 18~22min.

[0029] The following is a detailed description of the composition of the urban domestic waste resource recycling and comprehensive utilization system of this technical solution using a specific embodiment: The system includes components such as a first conveyor 1, a magnetic separator 2, a crusher 3, a waste gas purification device 4, a dryer 5, a second conveyor 6, a closed air valve 7, a rotary carbonization furnace 8, a cooling conveyor 9, a gravity separator 10, an eddy current separator 11, a carbonization furnace heating device 12, a combustible gas collection device 13, and a waste heat recovery pipeline 14. The connection methods of the components in this system are as follows: the feed end 102 of the first conveyor 1 is connected to the discharge end 303 of the crusher; the magnetic separator 2 is placed on top of the first conveyor 1; the feed end 502 of the dryer is connected to the discharge end 103 of the first conveyor 1; the feed end 106 of the second conveyor 6 is connected to the discharge end 503 of the dryer; the feed end 702 of the airlock is connected to the discharge end 103 of the second conveyor 6; the feed end 802 of the carbonization furnace is connected to the discharge end 703 of the airlock; the feed end 902 of the cooling conveyor is connected to the discharge end 803 of the carbonization furnace; the feed end 1102 of the eddy current separator is connected to the discharge end 903 of the cooling conveyor; and the feed end 106 of the gravity separator is connected to the discharge end 303 of the first conveyor 1. 02 is connected to the discharge end 1103 of the eddy current separator, the air inlet end 1301A of the cyclone dust collector is connected to the air outlet end 804 of the carbonization furnace, the combustion end 1203 of the carbonization furnace heating device 12 is connected to the heating port 806 of the rotary carbonization furnace 8, the air inlet pipe connection end 1202 of the carbonization furnace heating device 12 is connected to the air outlet end 1303B of the gas storage tank (or the first spare end 1303C of the gas storage tank, or the second spare end 1303D of the gas storage tank), one end of the waste heat recovery pipe 14 is connected to the exhaust port 805 of the rotary carbonization furnace 8, the other end of the waste heat recovery pipe 14 is connected to the air inlet 505 of the dryer, and the dust removal device input end 401A in the waste gas purification device 4 is connected to the exhaust port 504 of the dryer.

[0030] The characteristics of each component in the system are as follows: The structure of the crusher is as follows Figure 5 As shown, the material to be crushed enters from the feed end 302 of the crusher, and then undergoes a crushing operation (e.g., the crushing rollers are driven by a motor to crush the material) within the main crusher 301. The crushed material is output from the discharge end 303 of the crusher. The motor is equipped with forward and reverse overload protection. When encountering a hard object, the motor reverses several times to alleviate damage to the blades from the hard object and effectively prevent the equipment from jamming.

[0031] The structure of the conveyor (including the first conveyor 1 and the second conveyor 6) is as follows: Figure 3 As shown, the feed end 102 of the conveyor is used to receive the material to be conveyed. The main conveyor 101 drives the conveyor belt to move through the motor, thereby transferring the material from one end to the other end. Then the material is unloaded at the discharge end 103 of the conveyor.

[0032] The structure of dryer 5 is as follows Figure 7As shown, it includes a dryer main unit 501, a dryer feed end 502, a dryer discharge end 503, a dryer exhaust port 504, and a dryer air inlet 505. The dryer air inlet 505 is used to receive externally input heat, thereby realizing the heating and drying operation of the material in the dryer main unit 501. The flue gas that has completed heat exchange is discharged to the outside from the dryer exhaust port 504.

[0033] Magnetic separator 2 is used to screen magnetic substances in materials, and therefore can be used to separate waste iron and other substances from crushed materials. Its structure is as follows: Figure 4 As shown.

[0034] The airlock valve 7, also known as a rotary valve, is commonly used in pneumatic feed systems. For both pressure and negative pressure feed systems, the airlock valve 7 can provide uniform and continuous feeding while ensuring a stable gas-solid ratio within the feed line. Its structure is as follows: Figure 8 As shown, it consists of a main unit 701 of the airlock, a feed end 702 of the airlock, and a discharge end 703 of the airlock.

[0035] The rotary carbonization furnace 8 in this specific embodiment consists of several parts, including the main carbonization furnace 801, the carbonization furnace feed end 802, the carbonization furnace discharge end 803, the carbonization furnace gas outlet end 804, and the flue gas outlet 805. Its structure is as follows: Figure 9 As shown, the combustible gas (natural gas) generated inside the carbonization furnace main unit 801 can be recovered and reused. Therefore, a dedicated carbonization furnace outlet 804 is provided for connecting the combustible gas collection device 13. Since the required temperature of the dryer 5 is much lower than that of the rotary carbonization furnace 8, the waste gas after carbonization can also be reused, returning to the dryer 5 through the exhaust port 805 for drying. The rotary carbonization furnace 8 can be heated externally or internally. In this application, external heating is preferred. Therefore, a heating port 806 is also provided on the rotary carbonization furnace 8 to receive the heat input from the carbonization furnace heating device 12.

[0036] The structure of the carbonization furnace heating device 12 in this application is as follows: Figure 13 As shown, it has a tubular structure as a whole, including an air intake pipe connection end 1202 for connecting to the fuel source, a main heating device 1201, and a combustion end 1203, which is inserted into the heating port 806 of the rotary carbonization furnace 8.

[0037] The structure of cooling conveyor 9 is as follows Figure 10 As shown, it includes a cooling conveyor main unit 901, a cooling conveyor feed end 902, and a cooling conveyor discharge end 903. The cooling conveyor main unit 901 is equipped with a spiral structure inside, which can realize the cooling function during the material conveying process, and the conveying speed is adjustable.

[0038] The structure of the eddy current separator 11 is as follows: Figure 12 As shown, it is a non-ferrous metal recycling device, which includes an eddy current separator main unit 1101, an eddy current separator feed end 1102, an eddy current separator discharge end 1103, and a non-ferrous metal discharge end 1104. The screened non-ferrous metals are output through the non-ferrous metal discharge end 1104, while the remaining materials are output through the eddy current separator discharge end 1103 to the gravity separator feed end 1002 for the next step of carbon-based material separation.

[0039] The structure of gravity sorting machine 10 is as follows Figure 11 As shown, it includes several parts such as a gravity separator main unit 1001, a gravity separator feed end 1002, and a gravity separator discharge port 1003. The gravity separator main unit 1001 can divide the material into multiple groups according to the different material densities, and correspondingly, there will be multiple gravity separator discharge ports 1003. Specifically, in this embodiment, it can output various materials such as metals, glass, sand, and ceramics.

[0040] The structure of the combustible gas collection device 13 is as follows: Figure 14 As shown, it includes a cyclone dust collector main unit 1301, a gas purification separator 1302, and a gas storage tank 1303 connected in sequence. The cyclone dust collector main unit 1301 is provided with a cyclone dust collector inlet end 1301A and a cyclone dust collector outlet end 1301B. The gas purification separator 1302 is provided with a purification separator input end 1302A and a purification separator output end 1302B. The gas storage tank 1303 is provided with a gas storage tank inlet end 1303A and a gas storage tank outlet end 1303B, and is also provided with a first spare end 1303C and a second spare end 1303D. The cyclone dust collector inlet 1301A is connected to the carbonization furnace outlet to receive the natural gas generated after carbonization in the rotary carbonization furnace 8 and perform dust removal. Then, through the connection between the purification separator inlet 1302A and the cyclone dust collector outlet 1301B, the natural gas enters the gas purification separator 1302 for further purification. After that, through the connection between the gas storage tank inlet 1303A and the purification separator outlet 1302B, the purified natural gas is transferred to the gas storage tank 1303 for storage.

[0041] The structure of the exhaust gas purification device 4 is as follows: Figure 6 As shown, it includes a dust removal device 401, a spray tower 402, a UV integrated machine 403, a fan 404, and a chimney 405 connected in sequence. The dust removal device input end of the dust removal device 401 is connected to the exhaust port 504 of the dryer, the spray tower input end 402A is connected to the dust removal device output end 401B, the UV integrated machine input end 403A is connected to the spray tower output end 402B, the fan 404 air inlet is connected to the UV integrated machine output end 403B, and the fan 404 air outlet is connected to the chimney 405.

[0042] The specific steps for comprehensive utilization of municipal solid waste resources using the municipal solid waste resource recycling system of this specific embodiment are as follows: a. The waste to be processed is fed into the crusher 3 through the feed end 302 of the crusher. After being crushed, the length is about 30mm. Then the material is output from the discharge end 303 of the crusher and falls into the feed end 102 of the first conveyor 1. b. During the conveying process of the crushed waste material on the first conveyor 1, the scrap iron is separated by the magnetic separator 2 located on the upper part of the first conveyor 1. c. After being sorted by the magnetic separator 2, the garbage falls from the discharge end 103 of the conveyor into the feed end 502 of the dryer. In the dryer 5, the garbage is dried and turned to the discharge end 503 of the dryer. The exhaust gas generated during drying enters the exhaust gas purification device 4 from the exhaust port 504 of the dryer. The exhaust gas purification device 4 treats the exhaust gas and discharges it in compliance with standards. d. Waste material falls from the dryer discharge end 503 into the conveyor feed end 102 of the second conveyor 6; e. Waste material falls from the discharge end 103 of the second conveyor 6 into the feed end 702 of the airlock; f. The waste material falls from the outlet end 703 of the airlock into the feed end 802 of the rotary carbonization furnace 8. Under the action of the spiral of the rotary carbonization furnace 8, the waste material is carbonized during the rotation process. The carbonization temperature is 480-550℃ and the carbonization time is about 20 minutes. The carbonization products are combustible gas and carbon-based material. The combustible gas enters the gas outlet end 804 of the carbonization furnace, while the carbon-based material is transferred to the discharge end 803 of the carbonization furnace. g. The combustible gas enters the combustible gas collection device 13 from the gas outlet 804 of the carbonization furnace for separation, purification, and storage for later use; h. The carbon-based material falls from the discharge end 803 of the carbonization furnace into the feed end 902 of the cooling conveyor, and after cooling, it falls from the discharge end 903 of the cooling conveyor into the feed end 1102 of the eddy current separator. i. The carbon-based material falling into the eddy current separator 11 is separated by the eddy current separator. After all the non-ferrous metals are screened, it enters the non-ferrous metal discharge end 1104. The separated carbon-based material falls from the discharge end 1103 of the eddy current separator into the feed end 1002 of the gravity separator. j. The carbon-based material falling into the gravity separator 10 is separated into fixed carbon, sand, ceramics, glass, etc. by the gravity separator 10, and then enters the discharge port 1003 of the gravity separator respectively. After discharge, the material is collected and packaged in categories.

[0043] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed herein.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A comprehensive system for the recycling and utilization of urban domestic waste, characterized in that, The system includes a crusher (3), a dryer (5), a rotary carbonization furnace (8), a cooling conveyor (9), and a gravity separator (10) connected in sequence. The crusher (3) has a crusher feed end (302) at the top and the gravity separator (10) has multiple gravity separator discharge ports (1003) at the bottom. The urban domestic waste resource recycling system also includes a combustible gas collection device (13). The rotary carbonization furnace (8) is also equipped with a rotary carbonization furnace gas outlet (804). The combustible gas collection device (13) and the rotary carbonization furnace gas outlet (804) are connected by a pipeline. The rotary carbonization furnace (8) is also connected to a carbonization furnace heating device (12).

2. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, A first conveyor (1) is also connected between the crusher (3) and the dryer (5); a magnetic separator (2) is also provided above the first conveyor (1). The horizontal projection of the magnetic separator (2) coincides with the horizontal projection of the first conveyor (1), and the distance between the bottom surface of the magnetic separator (2) and the surface of the conveyor belt of the first conveyor (1) is less than the magnetic range of the magnetic separator (2).

3. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 2, characterized in that, The direction of the conveyor belt of the magnetic separator (2) is perpendicular to the direction of the conveyor belt of the first conveyor (1).

4. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, An eddy current separator (11) is also connected between the cooling conveyor (9) and the gravity separator (10); the bottom of the eddy current separator (11) is provided with a non-ferrous metal discharge end (1104) and an eddy current separator discharge end (1103), and the eddy current separator discharge end (1103) is connected to the gravity separator (10).

5. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, A second conveyor (6) and an airlock (7) are connected in sequence between the dryer (5) and the rotary carbonization furnace (8).

6. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, The gas inlet pipe connection end (1202) of the carbonization furnace heating device (12) is connected to the combustible gas collection device (13).

7. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, The rotary carbonization furnace (8) and the dryer (5) are connected by a waste heat recovery pipe (14).

8. The urban domestic waste resource recycling and comprehensive utilization system as described in claim 1, characterized in that, Also includes Waste gas purification device (4), which is connected to the dryer (5).

9. A method for comprehensive utilization and recycling of urban domestic waste, characterized in that, The method of using the urban domestic waste resource recycling and comprehensive utilization system as described in any one of claims 1-8 includes: The municipal solid waste to be processed is fed into the feed end (302) of the crusher to obtain crushed material; The crushed material is transferred to the dryer (5) and dried by the dryer (5) to obtain the dried material; The dried material is carbonized using the rotary carbonization furnace (8) to obtain combustible gas and carbon-based material; The combustible gas is introduced into the combustible gas collection device (13); The carbon-based material is cooled by the cooling conveyor (9) and then fed into the gravity separator (10). The cooled carbon-based material is sorted by the gravity separator (10), and several kinds of recyclable carbon-based materials obtained after sorting are output from the corresponding gravity separator outlet (1003).

10. The method for comprehensive utilization and recycling of urban domestic waste as described in claim 9, characterized in that, During the carbonization process, the carbonization temperature is 480℃~550℃ and the carbonization time is 18~22min.

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