Scrap aluminum delivery preheating and vocs waste heat recovery system equipment

Abstract

This invention provides a waste aluminum feeding preheating and VOCs waste heat recovery system. The system includes: a feeder, a first conveyor belt, a shredder, a second conveyor belt, a magnetic separator, a third conveyor belt, and a vibrating feeder, arranged sequentially along the waste aluminum conveying direction. This invention uses a mechanical pump to drive the circulation of molten aluminum between the heating chamber and the feeding chamber, forming a high-speed rotating centrifugal vortex of molten aluminum in a vortex well. Cleaned waste aluminum, after preheating and VOCs decomposition, falls from the outlet of the high-temperature screw conveyor into the molten aluminum vortex within the vortex well. The high-temperature molten aluminum rapidly immerses and melts the waste aluminum. Because of this high-temperature immersion melting method, direct contact between the waste aluminum and the high-temperature oxygen-containing flame is avoided. This solves the problem in existing technologies where waste aluminum floats on the surface of the molten aluminum and is easily burned when exposed to open flames, significantly reducing the oxidation and burn-off rate of waste aluminum and improving the aluminum recovery rate and water output rate.

Description

Technical Field

[0001] This invention relates to the field of aluminum waste recycling and processing technology, specifically to a waste aluminum feeding preheating and VOCs waste heat recovery system. Background Technology

[0002] In the scrap aluminum recycling and smelting industry, light and thin crushed materials (such as aluminum shavings, beverage cans, aluminum foil, crushed building profiles, and miscellaneous aluminum) are usually briquetteed and packaged for transportation due to their loose volume and high water and oil content. These scrap aluminum raw materials contain a large amount of VOCs (volatile organic compounds) such as cutting fluid, paint, machine oil, wood, plastic, packaging cartons, woven bags, and foam.

[0003] Currently, traditional smelting methods typically involve directly feeding these scrap aluminum materials into the furnace for melting. Since the scrap aluminum floats on the surface of the molten aluminum, it is easily oxidized and burned when exposed to open flames, with a burn rate as high as 20%, turning into AlO2 aluminum ash. This results in low aluminum recovery rates and poor economic benefits. At the same time, the VOCs (volatile organic compounds) in the scrap aluminum release large amounts of black smoke at high temperatures, severely polluting the surrounding working environment. Direct emission not only wastes the calorific value of VOCs (burning 1 kg of VOCs can release 4000 to 8000 kcal of heat), but also increases the burden on dust removal and environmental protection equipment. In addition, the existing technology lacks complete sets of equipment for preheating waste aluminum and effectively collecting and utilizing VOCs waste gas, resulting in problems such as high energy consumption in waste aluminum melting, high labor intensity for workers, and harsh workshop environment. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention aims to provide a waste aluminum feeding preheating and VOCs waste heat recovery system.

[0005] The waste aluminum feeding preheating and VOCs waste heat recovery system equipment of the present invention includes: a feeder, a first conveyor belt, a shredder, a second conveyor belt, a magnetic separator, a third conveyor belt and a vibrating feeder arranged in sequence along the waste aluminum conveying direction; the conical hopper is arranged on the shredder; and a conveying mechanism for conveying the processed waste aluminum is provided on the left side of the vibrating feeder. The conveying mechanism is provided with a first support platform and a fixed frame on the left side in sequence. The fixed frame is provided with a heating chamber furnace and a feeding chamber furnace, which are connected to each other. A low-temperature screw conveyor is installed on the first support platform. A double-layer flap valve is fixedly connected to the inlet of the low-temperature screw conveyor. A hopper is fixedly connected to the double-layer flap valve. A high-temperature screw conveyor is installed on the first support platform and is connected to the outlet of the low-temperature screw conveyor. A vortex well is set on the side of the feeding chamber furnace. A flue gas collection bell connected to the vortex well and connected to the outlet of the high-temperature screw conveyor is connected to the flue gas collection bell. A stirring well is connected to the heating chamber furnace and a mechanical pump is connected to the stirring well. A high-level flow channel is connected to the heating chamber furnace and a low-level flow channel is connected to the feeding chamber furnace. The first support platform is equipped with a flue gas extraction mechanism connected to a low-temperature screw conveyor. One end of the flue gas extraction mechanism is connected to the furnace of the feeding chamber. The flue gas extraction mechanism is used to reversely transport the high-temperature flue gas generated in the vortex well to the low-temperature screw conveyor and the high-temperature screw conveyor to preheat the waste aluminum, and to extract the VOCs waste gas generated by pyrolysis to the furnace of the feeding chamber for incineration.

[0006] Furthermore, it is particularly preferred that the flue gas extraction mechanism includes a material-gas separation tee connected to a low-temperature screw conveyor, and a high-temperature resistant fan fixedly connected to the first support platform. The air inlet of the high-temperature resistant fan is connected to a first exhaust pipe, and a cyclone separator is fixedly connected between the first exhaust pipe and the material-gas separation tee. The air outlet of the high-temperature resistant fan is connected to a second exhaust pipe, and an exhaust gas burner is connected to the second exhaust pipe. The exhaust gas burner is connected to the furnace wall of the feeding chamber furnace.

[0007] Furthermore, it is particularly preferred that the cyclone separator is connected to a pneumatic ash discharge valve.

[0008] Furthermore, it is particularly preferred that the flue gas extraction mechanism also includes a VOCs exhaust gas monitoring device installed on the second exhaust duct.

[0009] Furthermore, it is particularly preferred that the conveying mechanism includes a mounting frame disposed on the left side of the vibrating feeder, a fourth conveyor belt fixedly connected to the mounting frame, the feed end of the fourth conveyor belt being located below the discharge port of the vibrating feeder, a fifth conveyor belt being disposed to the left of the fourth conveyor belt, a second support platform being disposed behind the fifth conveyor belt, and a sixth conveyor belt being fixedly connected to the second support platform.

[0010] Furthermore, it is particularly preferred that the high-temperature screw conveyor is made of heat-resistant stainless steel, and the high-temperature flue gas inside flows in the opposite direction to the waste aluminum conveying direction.

[0011] Furthermore, it is particularly preferred that the inner wall of the flue gas collection bell is lined with a layer of refractory castable.

[0012] Furthermore, it is particularly preferred that the exhaust gas burner sprays towards the interior of the feeding chamber furnace.

[0013] Furthermore, it is particularly preferred that a frame is fixedly connected to the fixed frame, and a dust removal and environmental protection device connected to the furnace of the heating chamber is installed on the frame.

[0014] Furthermore, it is particularly preferred that the first support platform, the fixing frame, and the second support platform are equipped with ladders and guardrails.

[0015] The advantages of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention are as follows: A. This invention, under the suction of a high-temperature fan, directs high-temperature flue gas sequentially through a flue gas collection bell, a high-temperature screw conveyor, and a low-temperature screw conveyor before finally entering a flue gas extraction mechanism. This creates an airflow path opposite to the direction of waste aluminum transport. Because the high-temperature flue gas flows in the opposite direction to the waste aluminum transport, it comes into counter-current contact with the waste aluminum in the high-temperature screw conveyor, providing initial preheating. The waste aluminum absorbs the heat from the flue gas, causing its temperature to rise. Subsequently, the flue gas enters the low-temperature screw conveyor, continuing to come into counter-current contact with the waste aluminum for secondary preheating, further increasing the waste aluminum's temperature. Simultaneously, a large amount of VOCs (volatile organic compounds) on the surface of the waste aluminum (such as cutting fluid, paint, machine oil, wood, plastic, packaging cartons, woven bags, foam, etc.) are decomposed and vaporized during the heating process, generating VOCs waste gas (black smoke). Burning 1 kg of these VOCs (volatile organic compounds) can release 4,000 to 8,000 kcal of heat. The aforementioned waste aluminum raw materials typically contain 1% to 9% VOCs. Melting 1 ton of such thin, broken material can release 50,000 to 900,000 kcal of heat. Directly releasing this heat would result in a huge waste. However, this invention fully utilizes the calorific value of VOCs by collecting the waste gas and incinerating it in the furnace of the feeding chamber. This significantly reduces the consumption of fuels such as natural gas (for every 1% increase in VOC content in waste aluminum raw materials, more than 4.5 cubic meters of natural gas can be saved. If the content reaches 3%, melting 1 ton of such thin, broken material can save 13.5 cubic meters of natural gas per ton of aluminum). It turns waste into treasure and has a significant energy-saving effect.

[0016] B. This invention also separates large particles of carbon black, debris, and other dust from the flue gas using a cyclone separator, preventing carbon black from adhering to the impeller of the high-temperature fan and extending the fan's service life. The separated dust is periodically discharged through a pneumatic ash discharge valve. Simultaneously, a VOCs exhaust gas monitoring device is installed on the second exhaust duct. This device monitors the concentration of VOCs exhaust gas in the duct in real time and transmits the monitoring data to the control system. When the VOCs exhaust gas concentration reaches a set value, the control system automatically adjusts the combustion parameters of the exhaust gas burner to ensure that the VOCs exhaust gas is fully combusted in the furnace of the feeding chamber, thereby guaranteeing the VOCs exhaust gas incineration efficiency.

[0017] C. This invention also uses a mechanical pump to drive the circulation of molten aluminum between the heating chamber and the feeding chamber, forming a high-speed rotating centrifugal vortex of molten aluminum in the vortex well. Clean waste aluminum, after preheating and VOCs decomposition, falls from the outlet of the high-temperature screw conveyor into the molten aluminum vortex in the vortex well. The high-temperature molten aluminum quickly immerses and melts the waste aluminum. Because the high-temperature molten aluminum immersion melting method is adopted, the waste aluminum is avoided from direct contact with the high-temperature oxygen-containing flame. This solves the problem in the prior art that waste aluminum floats on the surface of the molten aluminum when directly fed into the furnace for melting and is easily burned when exposed to open flame. This significantly reduces the oxidation and burning rate of waste aluminum, improves the aluminum recovery rate and water output rate, and has a significant effect of reducing losses and increasing efficiency.

[0018] D. This invention also uses a flue gas collection bell jar to collect the high-temperature flue gas in the vortex well in a sealed manner, and uses a high-temperature resistant fan to draw in the VOCs waste gas in a sealed manner and introduce it into the furnace of the feeding chamber for combustion in an organized manner. The entire flue gas circulation process is completely sealed, which eliminates the problem of black smoke overflow and environmental pollution, greatly reduces the emission of pollutants in the workshop, and purifies the workshop environment. Attached Figure Description

[0019] Figure 1 This is a first-view structural schematic diagram of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 2 This is a second-view structural schematic diagram of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 3 This is a first partial structural schematic diagram of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 4 This is a second partial structural diagram of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 5 This is a schematic diagram of the third partial structure of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 6 This is a schematic diagram of the flue gas extraction mechanism of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention; Figure 7 This is a schematic diagram of the fourth partial structure of the waste aluminum feeding preheating and VOCs waste heat recovery system equipment described in this invention.

[0020] Explanation of reference numerals in the attached drawings: 1-Feeder, 2-First conveyor belt, 3-Conical hopper, 4-Shredder, 5-Second conveyor belt, 6-Magnetic separator, 7-Third conveyor belt, 8-Vibrating feeder, 9-First support platform, 10-Fixed frame, 11-Heating chamber furnace, 12-Feeding chamber furnace, 13-Frame, 14-Dust removal and environmental protection equipment, 15-Feeding hopper, 16-Double-layer flap valve, 17-Low-temperature screw conveyor, 18-High-temperature screw conveyor, 19- 20-Flue gas collection bell jar, 21-Cyclone separator, 22-First flue gas duct, 23-High temperature resistant fan, 24-Second flue gas duct, 25-Waste gas burner, 26-Pneumatic ash discharge valve, 27-Vortex well, 28-Mechanical pump, 29-Agitator well, 30a-High-level flow channel, 30b-Low-level flow channel, 31-Mounting frame, 32-Fourth conveyor belt, 33-Second support platform, 34-Fifth conveyor belt, 35-Sixth conveyor belt. Detailed Implementation

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] To simplify the disclosure of this invention, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials. Example 1

[0023] Waste aluminum feeding preheating and VOCs waste heat recovery system equipment, such as Figure 1-7 As shown, it includes: a feeder 1, a first conveyor belt 2, a shredder 4, a second conveyor belt 5, a magnetic separator 6, a third conveyor belt 7 and a vibrating feeder 8 arranged sequentially along the direction of waste aluminum conveying; a conical hopper 3 is set on the shredder 4; and a conveying mechanism for conveying the processed waste aluminum is provided on the left side of the vibrating feeder 8. A first support platform 9 and a fixed frame 10 are arranged sequentially on the left side of the conveying mechanism. The fixed frame 10 is equipped with a heating chamber furnace 11 and a feeding chamber furnace 12. The heating chamber furnace 11 and the feeding chamber furnace 12 are connected. A low-temperature screw conveyor 17 is installed on the first support platform 9. A double-layer flap valve 16 is fixedly connected to the inlet of the low-temperature screw conveyor 17. A hopper 15 is fixedly connected to the double-layer flap valve 16. A high-temperature screw conveyor 18 is installed on the first support platform 9 and is connected to the outlet of the low-temperature screw conveyor 17. A vortex well 27 is located on the side of the feeding chamber furnace 12. A flue gas collection bell jar 19 is connected to the vortex well 27 and is connected to the outlet of the high-temperature screw conveyor 18. A stirring well 29 is connected inside the heating chamber furnace 11. A mechanical pump 28 is connected inside the stirring well 29. A high-level flow channel 30a is connected to the heating chamber furnace 11. A low-level flow channel 30b is connected to the feeding chamber furnace 12. The first support platform 9 is equipped with a flue gas extraction mechanism connected to the low-temperature screw conveyor 17. One end of the flue gas extraction mechanism is connected to the furnace 12 of the feeding chamber. The flue gas extraction mechanism is used to reversely transport the high-temperature flue gas generated in the vortex well 27 to the low-temperature screw conveyor 17 and the high-temperature screw conveyor 18 to preheat the waste aluminum, and to extract the VOCs waste gas generated by pyrolysis to the furnace 12 of the feeding chamber for incineration.

[0024] The flue gas extraction mechanism includes a material-gas separation tee 20 connected to the low-temperature screw conveyor 17, and a high-temperature resistant fan 23 fixedly connected to the first support platform 9. The air inlet of the high-temperature resistant fan 23 is connected to the first exhaust pipe 22. A cyclone separator 21 is fixedly connected between the first exhaust pipe 22 and the material-gas separation tee 20. The air outlet of the high-temperature resistant fan 23 is connected to the second exhaust pipe 24. An exhaust gas burner 25 is connected to the second exhaust pipe 24. The exhaust gas burner 25 is connected to the furnace wall of the feeding chamber furnace 12.

[0025] A pneumatic ash discharge valve 26 is connected to the cyclone separator 21.

[0026] The flue gas extraction mechanism also includes VOCs exhaust gas monitoring equipment installed on the second exhaust duct 24.

[0027] The conveying mechanism includes a mounting frame 31 located to the left of the vibrating feeder 8. A fourth conveyor belt 32 is fixedly connected to the mounting frame 31. The feed end of the fourth conveyor belt 32 is located below the discharge port of the vibrating feeder 8. A fifth conveyor belt 34 is located to the left of the fourth conveyor belt 32. A second support platform 33 is located behind the fifth conveyor belt 34. A sixth conveyor belt 35 is fixedly connected to the second support platform 33.

[0028] The high-temperature screw conveyor 18 is made of heat-resistant stainless steel, and the high-temperature flue gas inside flows in the opposite direction to the waste aluminum conveying direction.

[0029] The inner wall of the flue gas collection bell jar 19 is lined with a layer of refractory castable.

[0030] The exhaust gas burner 25 sprays towards the interior of the feeding chamber furnace 12.

[0031] When using this waste aluminum feeding preheating and VOCs waste heat recovery system, the waste aluminum raw materials are first classified according to their size and specifications: Large pieces of waste aluminum exceeding 200mm in size are fed directly from the furnace door in batches using a forklift or hydraulic feeder, without entering the automatic feeding system. However, broken materials smaller than 200mm to 50mm and light, thin materials with particle sizes smaller than 50mm are processed through the automatic feeding system. First, the light, thin, broken materials to be processed (such as aluminum shavings, aluminum cans, broken profiles, etc.) are fed into the feeding machine 1. The feeding machine 1 evenly conveys the waste aluminum raw materials to the first conveyor belt 2, which then feeds the waste aluminum into the conical hopper 3. The waste aluminum in the conical hopper 3 will then fall into the tear... The waste aluminum is shredded in the crusher 4 to break large pieces of waste aluminum into suitable sizes. The shredded waste aluminum then falls into the second conveyor belt 5 and is conveyed to the magnetic separator 6. The magnetic separator 6 adsorbs and removes iron impurities from the waste aluminum to prevent iron impurities from entering the smelting system and thus preventing the aluminum liquid from containing other components. The waste aluminum after iron removal is conveyed to the vibrating feeder 8 via the third conveyor belt 7. The vibrating feeder 8 vibrates and disperses the waste aluminum evenly. Then, the waste aluminum is conveyed to the discharge hopper 15 by the conveying mechanism composed of the fourth conveyor belt 32, the fifth conveyor belt 34 and the sixth conveyor belt 35. The waste aluminum in the discharge hopper 15 falls into the low temperature screw conveyor 17 through the double-layer flap valve 16. The double-layer flap valve 16 acts as an airlock to prevent the flue gas from overflowing. Meanwhile, during the scrap aluminum conveying process, the high-temperature fan 23 is activated. The high-temperature fan 23 is connected to the low-temperature screw conveyor 17 via the first exhaust pipe 22, cyclone separator 21, and material-gas separation tee 20, forming a negative pressure suction. Simultaneously, the high-temperature flue gas generated after the high-temperature molten aluminum in the furnace chamber 12 comes into contact with the scrap aluminum enters the vortex well 27. The flue gas collection bell 19 seals and collects the high-temperature flue gas within the vortex well 27. Under the suction of the high-temperature fan 23, the high-temperature flue gas passes sequentially through the flue gas collection bell 19, the high-temperature screw conveyor 18, and the low-temperature screw conveyor 17, finally entering the flue gas extraction mechanism, forming an airflow path opposite to the scrap aluminum conveying direction. Because the high-temperature flue gas flow direction is opposite to the scrap aluminum conveying direction, the high-temperature flue gas flows through the high-temperature screw conveyor 18... The waste aluminum is initially preheated by contacting it in the reverse direction with the flue gas. After absorbing the heat from the flue gas, the temperature of the waste aluminum rises. Then, the flue gas enters the low-temperature screw conveyor 17 and continues to contact the waste aluminum in the reverse direction for secondary preheating. The temperature of the waste aluminum rises further, and the VOCs (organic combustibles) on the surface of the waste aluminum (such as cutting fluid, paint, machine oil, wood, plastic, packaging cartons, woven bags, foam, etc.) are largely decomposed and gasified during the heating process, producing black smoke VOCs exhaust gas. Burning 1 kg of these VOCs can release 4,000 to 8,000 kcal of heat. Since the above-mentioned waste aluminum raw materials usually contain 1% to 9% organic compounds (VOCs), melting 1 ton of such light and thin crushed material can release 50,000 to 900,000 kcal of heat. If this heat is directly emitted, it will cause huge waste. Next, after preheating the waste aluminum, the flue gas enters the cyclone separator 21 through the gas-material separation tee 20. The cyclone separator 21 uses centrifugal force to separate large particles of carbon black, debris, and other dust from the flue gas, preventing carbon black from adhering to the impeller of the high-temperature fan 23 and extending the fan's service life. The separated dust is periodically discharged through the pneumatic ash discharge valve 26. Meanwhile, the flue gas after dust removal enters the high-temperature fan 23 through the first exhaust pipe 22. The high-temperature fan 23 pressurizes the flue gas and then delivers it to the exhaust gas burner 25 through the second exhaust pipe 24. The exhaust gas burner 25 removes VOCs. The exhaust gas is injected into the furnace 12 of the feeding chamber for incineration. The VOCs exhaust gas is fully burned in the furnace 12 of the feeding chamber, releasing a large amount of heat. This heat is used as supplementary energy to melt the scrap aluminum, which greatly reduces the consumption of fuels such as natural gas (for every 1% increase in VOCs content in scrap aluminum raw materials, more than 4.5 cubic meters of natural gas can be saved. If the content reaches 3%, melting 1 ton of such light and thin crushed material can save 13.5 cubic meters of natural gas per ton of aluminum). Then, the high-temperature flue gas after incineration re-enters the vortex well 27 and the flue gas collection bell jar 19 to form a flue gas cycle. It should be noted that a VOCs exhaust gas monitoring device is installed on the second exhaust duct 24. This device monitors the concentration of VOCs exhaust gas in the duct in real time and transmits the monitoring data to the control system. When the VOCs exhaust gas concentration reaches the set value, the control system automatically adjusts the combustion parameters of the exhaust gas burner 25 to ensure that the VOCs exhaust gas is fully burned in the furnace 12 of the feeding chamber. During the preheating of waste aluminum and VOCs pyrolysis, the flue gas in the low-temperature screw conveyor 17 and the high-temperature screw conveyor 18 flows counter-currently with the waste aluminum. The waste aluminum is gradually heated from room temperature, which not only fully volatilizes the moisture and oil on the surface of the waste aluminum, but also causes a large amount of VOCs organic combustibles to be pyrolyzed and gasified. The generated VOCs waste gas is drawn in by the high-temperature fan 23 in a closed loop, and after dust removal by the cyclone separator 21, it is systematically introduced into the furnace 12 of the feeding chamber for incineration. The entire flue gas circulation process is completely closed, preventing the spread of the virus. To address the problem of black smoke pollution, high-temperature flue gas flows in the opposite direction to the waste aluminum flow. After heating the waste aluminum, it becomes low-temperature flue gas. At the same time, the VOCs combustibles on the surface of the waste aluminum are cracked and turned into VOCs waste gas. This VOCs waste gas is drawn in by the high-temperature fan 23, and after being dusted by the cyclone separator 21, it is passed into the furnace 12 of the feeding chamber through the waste gas burner 25 for combustion, and then becomes clean high-temperature flue gas again. This cycle is repeated to make full use of the calorific value of VOCs. The whole process is completely sealed to avoid the leakage of flue gas / black smoke waste gas. Meanwhile, during the smelting process, the dual-chamber side-pool aluminum melting furnace forms a high-temperature aluminum liquid circulation process: the high-temperature aluminum liquid in the heating chamber furnace 11 is forcibly stirred and circulated by the stirring well 29 and the mechanical pump 28, and is then transported to the vortex well 27 in the feeding chamber furnace 12. A high-speed rotating centrifugal vortex of aluminum liquid is formed in the vortex well 27. Cleaned scrap aluminum, after preheating and VOCs decomposition, falls from the outlet of the high-temperature screw conveyor 18 into the aluminum liquid vortex in the vortex well 27. The high-temperature aluminum liquid rapidly immerses and melts the scrap aluminum. Because of this high-temperature aluminum liquid immersion melting method, direct contact between the scrap aluminum and the high-temperature oxygen-containing flame is avoided, significantly reducing the waste aluminum content. The oxidation loss rate is reduced, improving the aluminum liquid recovery rate and water output rate. It also solves the problems in the existing technology, where scrap aluminum is usually directly put into the furnace for melting. However, because the scrap aluminum floats on the surface of the aluminum liquid, it is easily burned when exposed to open flame, with a burn rate as high as 20%, turning into AlO2 aluminum ash. This results in the waste of thin and broken materials, leading to low aluminum liquid recovery rate. The molten aluminum liquid is driven by mechanical pump 28 to circulate between the heating chamber furnace 11 and the feeding chamber furnace 12, keeping the aluminum liquid temperature in the furnace uniform. The molten aluminum liquid can then be discharged through the high-level flow channel 30a and the low-level flow channel 30b for use in subsequent processes. Example 2

[0032] Based on Example 1, such as Figure 4-5 As shown, a frame 13 is fixedly connected to the fixed frame 10, and a dust removal and environmental protection device 14 connected to the furnace chamber 11 is installed on the frame 13.

[0033] Ladders and guardrails are provided on the first support platform 9, the fixed frame 10, and the second support platform 33.

[0034] It should be noted that during the entire system operation, the dust removal and environmental protection equipment 14 connected to the heating chamber furnace 11 performs unified dust removal treatment on the dust-laden flue gas generated by the system to ensure that emissions meet standards, extend the service life of the filter bags, and reduce the environmental burden; the ladders and guardrails configured on the first support platform 9, the fixed frame 10 and the second support platform 33 facilitate operators to conduct daily inspections and maintenance of the equipment to ensure the safe and stable operation of the equipment.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A waste aluminum feeding preheating and VOCs waste heat recovery system, characterized in that, include: The following components are arranged sequentially along the direction of waste aluminum conveying: a feeder (1), a first conveyor belt (2), a shredder (4), a second conveyor belt (5), a magnetic separator (6), a third conveyor belt (7), and a vibrating feeder (8). The conical hopper (3) is located on the shredder (4), and the vibrating feeder (8) has a conveying mechanism on its left side for conveying the processed waste aluminum. The conveying mechanism is provided with a first support platform (9) and a fixed frame (10) on the left side. The fixed frame (10) is provided with a heating chamber furnace (11) and a feeding chamber furnace (12). The heating chamber furnace (11) and the feeding chamber furnace (12) are connected. A low-temperature screw conveyor (17) is installed on the first support platform (9). A double-layer flap valve (16) is fixedly connected to the inlet of the low-temperature screw conveyor (17). A hopper (15) is fixedly connected to the double-layer flap valve (16). The first support platform (9) is equipped with a low-temperature screw conveyor. A high-temperature screw conveyor (18) is connected to the discharge port of the conveyor (17). The vortex well (27) is located on the side of the furnace (12) of the feeding chamber. A flue gas collection bell jar (19) connected to the discharge port of the high-temperature screw conveyor (18) is connected to the vortex well (27). A stirring well (29) is connected inside the furnace (11) of the heating chamber. A mechanical pump (28) is connected inside the stirring well (29). A high-level flow channel (30a) is connected to the furnace (11) of the heating chamber. A low-level flow channel (30b) is connected to the furnace (12) of the feeding chamber. The first support platform (9) is equipped with a flue gas extraction mechanism connected to the low-temperature screw conveyor (17). One end of the flue gas extraction mechanism is connected to the furnace (12) of the feeding chamber. The flue gas extraction mechanism is used to reversely transport the high-temperature flue gas generated in the vortex well (27) to the low-temperature screw conveyor (17) and the high-temperature screw conveyor (18) to preheat the waste aluminum, and to extract the VOCs waste gas generated by pyrolysis to the furnace (12) of the feeding chamber for incineration.

2. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, The flue gas extraction mechanism includes a material-gas separation tee (20) connected to a low-temperature screw conveyor (17) and a high-temperature resistant fan (23) fixedly connected to a first support platform (9). The air inlet of the high-temperature resistant fan (23) is connected to a first exhaust pipe (22). A cyclone separator (21) is fixedly connected between the first exhaust pipe (22) and the material-gas separation tee (20). The air outlet of the high-temperature resistant fan (23) is connected to a second exhaust pipe (24). An exhaust gas burner (25) is connected to the second exhaust pipe (24). The exhaust gas burner (25) is connected to the furnace wall of the feeding chamber furnace (12).

3. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 2, characterized in that, The cyclone separator (21) is connected to a pneumatic ash discharge valve (26).

4. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 2, characterized in that, The flue gas extraction mechanism also includes a VOCs exhaust gas monitoring device installed on the second exhaust duct (24).

5. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, The conveying mechanism includes a mounting frame (31) located to the left of the vibrating feeder (8), a fourth conveyor belt (32) fixedly connected to the mounting frame (31), the feed end of the fourth conveyor belt (32) being located below the discharge port of the vibrating feeder (8), a fifth conveyor belt (34) being provided to the left of the fourth conveyor belt (32), a second support platform (33) being provided behind the fifth conveyor belt (34), and a sixth conveyor belt (35) fixedly connected to the second support platform (33).

6. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, The high-temperature screw conveyor (18) is made of heat-resistant stainless steel, and the high-temperature flue gas inside flows in the opposite direction to the waste aluminum conveying direction.

7. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, The inner wall of the flue gas collection bell jar (19) is lined with a refractory castable layer.

8. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, The exhaust gas burner (25) sprays towards the interior of the feeding chamber furnace (12).

9. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, A frame (13) is fixedly connected to the fixed frame (10), and a dust removal and environmental protection device (14) connected to the furnace (11) of the heating chamber is installed on the frame (13).

10. The waste aluminum feeding preheating and VOCs waste heat recovery system equipment according to claim 1, characterized in that, Ladders and guardrails are provided on the first support platform (9), the fixed frame (10) and the second support platform (33).

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