Aluminum melting furnace flue gas recovery and utilization system and utilization method thereof

Abstract

The present invention relates to the technical field of aluminum melting furnace fume recovery and utilization, and specifically to an aluminum melting furnace fume recovery and utilization system and a utilization method thereof, comprising an aluminum melting furnace body, an air heating component and a fluid heating system, wherein an air heating component is arranged on the outside of the aluminum melting furnace body, and the air heating component utilizes the fume generated by the aluminum melting furnace body to heat the air, and transports the hot air into the aluminum melting furnace body to assist combustion of fuel inside the aluminum melting furnace body; the air heating component comprises an air heating tank, and two upper and lower diverter plates are arranged inside the air heating tank, and the diverter plates are circular. The present invention changes the traditional heat exchanger into a heat transfer tube, and a plurality of protrusions are distributed on the outside of the heat transfer tube to increase the heat conduction area, and the heat transfer tube is installed on the diverter plate, thereby increasing the number of heat transfer tubes and slowing down the flow rate of the air, thereby making the air heating rate faster and the failure rate lower, and at the same time, low cost and smaller size.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum melting furnace fume recovery and utilization, and in particular to an aluminum melting furnace fume recovery and utilization system and a utilization method thereof. Background Art

[0002] An aluminum melting furnace primarily consists of a furnace body, combustion chamber, heating elements, and a temperature control system. The furnace body, the main component of the furnace, is typically made of high-temperature-resistant materials such as refractory bricks and refractory concrete. The combustion chamber is the most crucial part of the smelting process, where fuel and air mix and burn, generating heat to heat the charge. However, inadequate recovery systems often lead to energy waste and environmental pollution during the smelting process.

[0003] Chinese patent application CN107883777A discloses a fume recovery and utilization system for an aluminum melting furnace, which relates to the technical field of industrial furnaces. The system comprises a furnace body, a main burner, at least two auxiliary burners, a first heat exchange device and a second heat exchange device. The second heat exchange device comprises an outer shell, a smoke inlet main pipe provided with a medium-temperature smoke inlet, a smoke exhaust main pipe provided with a low-temperature smoke outlet, an air inlet main pipe provided with a cold air inlet, an exhaust main pipe provided with a hot air outlet, and at least six rotating waste heat recoverers arranged horizontally at intervals and accommodated in the outer shell. Each rotating waste heat recoverer is connected to the smoke inlet main pipe, the smoke exhaust main pipe, the air inlet main pipe, and the exhaust main pipe respectively through pipelines.

[0004] In the above structure, the heat exchange device uses six rotating waste heat recovery devices to rotate internally for heat exchange. A rotating heat storage disk and partition are also provided inside the rotating waste heat recovery device. The rotating waste heat recovery device needs to rotate for heat exchange and requires external driving components, which results in a more complex heat exchanger structure and a higher failure rate. Summary of the Invention

[0005] The purpose of the present invention is to provide an aluminum melting furnace fume recovery and utilization system and a utilization method thereof. By replacing the traditional heat exchanger with a heat transfer tube, a plurality of protrusions are distributed on the outside of the heat transfer tube to increase the heat conduction area. The heat transfer tube is installed on a diverter plate, the number of heat transfer tubes is increased, and the air flow rate is slowed down, thereby making the air heating rate faster and the failure rate lower. At the same time, the cost is low and the volume is smaller.

[0006] To solve the problems of the prior art, the present invention provides an aluminum melting furnace fume recovery and utilization system and a utilization method thereof, comprising an aluminum melting furnace body, an air heating component, and a fluid heating system. The air heating component is provided on the outside of the aluminum melting furnace body, and the air heating component utilizes the fume generated by the aluminum melting furnace body to heat air and transport the hot air into the aluminum melting furnace body to assist combustion of fuel inside the aluminum melting furnace body.

[0007] The air heating assembly includes an air heating tank, wherein two upper and lower diverter plates are provided inside the air heating tank, and the diverter plates are circular, a heat transfer tube is distributed between the upper and lower diverter plates, and a plurality of heat-conducting protrusions are evenly distributed on the outside of the heat transfer tube;

[0008] The air heating assembly also includes a pneumatic fan, one end of which is connected to an air inlet pipe, and one end of the air inlet pipe is interconnected with the aluminum melting furnace body. The pneumatic fan rotates to suck the hot air in the heat transfer tube into the aluminum melting furnace body to assist the combustion of the fuel inside the aluminum melting furnace body.

[0009] Preferably, the lower diverter plate is connected to the air inlet of the pneumatic fan through a pipeline, the two diverter plates are detachably connected to the heat transfer tube, and a plurality of heat transfer tubes are provided between the two diverter plates.

[0010] Preferably, the upper diverter plate is connected to an air inlet, which passes through the top of the air heating tank and extends to the outside of the air heating tank. The air inlet is used to allow external air to enter the diverter plate and be diverted to the heat transfer tube.

[0011] Preferably, the interiors of the two diverter plates are hollow so that air can flow into the heat transfer tubes for heating. The distribution of multiple heat transfer tubes is used to increase the heating area and shorten the heating time.

[0012] Preferably, the power air inlet of the pneumatic fan is connected to a heat exchange box through a pipeline. The heat exchange box recovers the heat in the flue gas discharged from the aluminum melting furnace, and the heat exchange box is used to transfer the heat to the corresponding heat-absorbing elements in the fluid heating system. After the flue gas enters the heat exchange box, it is transported to the pneumatic fan through a pipeline to drive the pneumatic fan to rotate.

[0013] Preferably, the fluid heating system is used to absorb heat from the flue gas and to heat the fluid in the fluid heating system. The fluid heating system includes an outer heat conducting pipe, an inner heat conducting pipe and a fluid temporary storage tank. The outer heat conducting pipe and the inner heat conducting pipe are spirally fixed inside the heat exchange box, one end of the outer heat conducting pipe is fixedly connected to the other end of the inner heat conducting pipe, and the inner heat conducting pipe is arranged on the inner ring of the outer heat conducting pipe. The outer heat conducting pipe and the inner heat conducting pipe are used to absorb the waste heat of the flue gas in the heat exchange box and heat the fluid in the outer heat conducting pipe and the inner heat conducting pipe. The fluid in the outer heat conducting pipe and the inner heat conducting pipe enters the fluid temporary storage tank for temporary storage, and the heat in the fluid temporary storage tank is utilized when needed.

[0014] Preferably, the fluid heating system also includes a pneumatic pump body, and the pneumatic pump body is used to make the fluid in the outer heat conduction pipe and the inner heat conduction pipe flow into the fluid temporary storage tank, and the pneumatic pump body is interconnected with the heat exchange box through a pipeline, and a part of the flue gas flows into the pneumatic pump body through the pipeline to drive the pneumatic pump body, thereby making the fluid in the outer heat conduction pipe and the inner heat conduction pipe circulate.

[0015] Preferably, a flue gas filtration and purification system is further provided between the aluminum melting furnace body and the heat exchange box. The flue gas filtration and purification system is used to purify harmful substances in the flue gas discharged from the aluminum melting furnace body and transport the relatively clean flue gas to the heat exchange box for waste heat recovery.

[0016] Preferably, the heat exchange box is also provided with a cleaning system, which is used to remove dust from the surfaces of the outer heat conducting pipes and the inner heat conducting pipes in the fluid heating system when compressed gas is introduced into the cleaning system, so as to avoid excessive accumulation of dust in the outer heat conducting pipes and the inner heat conducting pipes, thereby affecting the efficiency of heat recovery.

[0017] The present application also relates to a method for recycling and utilizing the fume of an aluminum melting furnace, including an aluminum melting furnace fume recycling and utilizing system and a utilization method thereof in the above-mentioned scheme, which comprises the following steps:

[0018] S1: The staff introduces fuel into the aluminum melting furnace body, pours aluminum ingots or ore into the aluminum melting furnace body, ignites and melts. During the melting process, the aluminum melting furnace will produce a large amount of flue gas, which is generally passed into the flue gas filtration and purification system through the fan provided by the aluminum melting furnace;

[0019] S2: After the flue gas enters the flue gas filtration and purification system, the corresponding components in the flue gas filtration and purification system adsorb and purify the dust or harmful gases in the flue gas, and then the flue gas enters the heat exchange box;

[0020] S3: Since the outer heat pipe and the inner heat pipe are spirally coiled in the heat exchange box, the flow path of the fluid in the outer heat pipe and the inner heat pipe is increased, and the outer heat pipe and the inner heat pipe also increase the contact area with the flue gas, so that heat is transferred to the internal fluid. A portion of the flue gas in the heat exchange box flows into the pneumatic pump body through the pipe. The pneumatic pump body circulates the internal fluid, gradually heating the fluid in the fluid temporary storage tank, so that the heat in the fluid temporary storage tank can be used when needed.

[0021] S4: A portion of the flue gas enters the air heating tank. Because the air heating tank has a diverter plate and heat transfer tubes, the residual heat in the flue gas heats the air in the diverter plate and heat transfer tubes. The design of the diverter plate and heat transfer tubes increases the contact area with the flue gas, making the air heating faster. The flue gas passes through the pneumatic fan, which drives the pneumatic fan to rotate, allowing the hot air to enter the aluminum melting furnace body, supporting the combustion of the fuel in the aluminum melting furnace body and ensuring the stability of the furnace temperature.

[0022] S5: If dust accumulates on the surface of the outer heat conducting pipe and the inner heat conducting pipe on the pipeline, the outer heat conducting pipe and the inner heat conducting pipe are cleaned by the cleaning system to prevent the dust from affecting the heat conduction effect of the outer heat conducting pipe and the inner heat conducting pipe.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the aluminum melting furnace fume recovery and utilization system and the utilization method thereof are rationally structured and have the following advantages:

[0024] The present application is provided with a pneumatic fan and an air heating tank, and the air heating tank is provided with a diverter plate and a heat transfer tube, and the diverter plate and the heat transfer tube are detachably connected, and a number of heat transfer tubes are provided between the diverter plates, and a number of protrusions are distributed on each heat transfer tube, so that the heat transfer tube increases the contact area with the flue gas. At the same time, the diverter plate is used to divert the air, slow down the flow speed of the air in the heat transfer tube, and prolong the residence time of the air in the heat transfer tube, so as to make the air heating rate faster. The flue gas is used to drive the pneumatic fan to rotate and transport the air to the aluminum melting furnace body to assist combustion, thereby making full use of the waste heat of the flue gas and the kinetic energy of the flue gas flow. This structure has a low failure rate, low cost, and a smaller size. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is an external first stereoscopic schematic diagram of an aluminum melting furnace fume recovery and utilization system.

[0026] Figure 2 It is an external second stereoscopic schematic diagram of an aluminum melting furnace fume recovery and utilization system.

[0027] Figure 3 The diagram is a top view of the structure of an aluminum melting furnace fume recovery and utilization system.

[0028] Figure 4 The present invention is a schematic diagram of the internal first stereoscopic structure of an aluminum melting furnace fume recovery and utilization system.

[0029] Figure 5 It is a schematic diagram of the internal second three-dimensional structure of an aluminum melting furnace fume recovery and utilization system.

[0030] Figure 6 It is a schematic diagram of the internal third-dimensional structure of an aluminum melting furnace fume recovery and utilization system.

[0031] Figure 7 It is a schematic diagram of the internal fourth stereoscopic structure of an aluminum melting furnace fume recovery and utilization system.

[0032] Figure 8 The first structural diagram of the cleaning system of the fume recovery and utilization system of the aluminum melting furnace is shown.

[0033] Figure 9 The second structural diagram of the cleaning system of the fume recovery system of the aluminum melting furnace is shown.

[0034] Figure 10 It is a fume recovery and utilization system for aluminum melting furnace Figure 5 Enlarged structural diagram at point A in the middle.

[0035] The numbers in the figure are: 1. Aluminum melting furnace body; 2. Air heating assembly; 21. Air inlet pipe; 22. Pneumatic fan; 23. Air heating tank; 24. Air inlet; 25. Diverter plate; 26. Heat transfer pipe; 3. Fluid heating system; 31. Pneumatic pump body; 32. External heat conduction pipe; 33. Internal heat conduction pipe; 34. Fluid temporary storage tank; 4. Flue gas filtration and purification system; 41. Purification tank; 42. Exhaust gas ionizer; 43. Exhaust gas adsorption filter element; 5. Heat exchange box; 6. Cleaning system; 61. Compressed gas inlet pipe; 62. Cylinder; 63. Support pipe; 64. Nozzle; 65. Hollow connecting plate; 66. First exhaust plate; 661. First exhaust hole; 67. Second exhaust plate; 671. Second exhaust hole; 68. Rotating drive component. DETAILED DESCRIPTION

[0036] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1-10 As shown, the present invention provides: a fume recovery and utilization system for an aluminum smelting furnace and a method for utilizing the same, comprising an aluminum smelting furnace body 1, an air heating assembly 2, and a fluid heating system 3. The air heating assembly 2 utilizes the high-temperature fume generated by the aluminum smelting furnace body to heat air, and then transports the heated hot air back to the aluminum smelting furnace body 1 for combustion support, thereby improving combustion efficiency and reducing heat loss in fume emissions. The air heating assembly 2 is disposed outside the aluminum smelting furnace body 1. The air heating assembly 2 utilizes the fume generated by the aluminum smelting furnace body 1 to heat air, and then transports the hot air into the aluminum smelting furnace body 1 to support combustion of fuel within the aluminum smelting furnace body 1.

[0038] The air heating assembly 2 includes an air heating tank 23, which is internally provided with two circular upper and lower diverter plates 25. Heat transfer tubes 26 are distributed between the upper and lower diverter plates 25. The diverter plates 25 are used to evenly distribute air to each heat transfer tube 26. The heat transfer tubes 26 are also evenly distributed with a number of heat-conducting protrusions on the outside. These protrusions are used to increase the heat exchange area with the flue gas and improve thermal efficiency. When the flue gas passes through the heat transfer tubes 26, its heat is transferred to the air flowing within the tubes. The air heating tank 23 provides a closed space, which is equipped with heat transfer tubes 26 and diverter plates 25 for heat exchange.

[0039] The air heating assembly 2 also includes a pneumatic fan 22, one end of the pneumatic fan 22 is connected to the air intake pipe 21, and one end of the air intake pipe 21 is interconnected with the aluminum melting furnace body 1. The pneumatic fan 22 rotates to suck the hot air in the heat transfer tube 26 into the aluminum melting furnace body 1 to assist the combustion of the fuel inside the aluminum melting furnace body 1.

[0040] The lower diverter plate 25 is connected to the air inlet of the pneumatic fan 22 through a pipe. The two diverter plates 25 are detachably connected to the heat transfer tube 26, and several heat transfer tubes 26 are arranged between the two diverter plates 25. The upper diverter plate 25 is connected to the air inlet 24. The air inlet 24 passes through the top of the air heating tank 23 and extends to the outside of the air heating tank 23. The air inlet 24 is used to allow external air to enter the diverter plate 25 and be diverted to the heat transfer tube 26. The inside of the two diverter plates 25 is hollow, so that air can pass into the heat transfer tube 26 for heating. The distribution of multiple heat transfer tubes 26 is used to increase the heating area and shorten the heating time.

[0041] The power air inlet of the pneumatic fan 22 is connected to the heat exchange box 5 through a pipeline. The heat exchange box 5 recovers the heat in the flue gas discharged from the aluminum melting furnace, and the heat exchange box 5 is used to transfer the heat to the corresponding heat absorption element in the fluid heating system 3. After the flue gas enters the heat exchange box 5, it is transported to the pneumatic fan 22 through a pipeline to drive the pneumatic fan 22 to rotate.

[0042] In this embodiment, the diverter plate 25 and the heat transfer tube 26 are detachably connected. Several heat transfer tubes 26 are arranged between the diverter plates 25. Each heat transfer tube 26 is distributed with several protrusions, so that the heat transfer tube 26 increases the contact area with the flue gas. At the same time, the diverter plate 25 is used to divert the air, slow down the flow speed of the air in the heat transfer tube 26, and extend the residence time of the air in the heat transfer tube 26, so as to make the air heating rate faster. The flue gas is used to drive the pneumatic fan 22 to rotate and transport the air to the aluminum melting furnace body 1 to assist combustion, thereby fully utilizing the waste heat of the flue gas and the kinetic energy of the flue gas flow. This structure has a low failure rate, low cost, and a smaller size.

[0043] The fluid heating system 3 absorbs heat from the flue gas and heats the fluid within it. It includes an outer heat pipe 32, an inner heat pipe 33, and a fluid storage tank 34. The outer and inner heat pipes 32, 33 are fixed in a spiral shape within the heat exchange box 5. This spiral design increases the heat exchange surface area and improves heat exchange efficiency. One end of the outer heat pipe 32 is fixedly connected to the other end of the inner heat pipe 33, forming a closed fluid circulation path. The inner heat-conducting pipe 33 is arranged in the inner ring of the outer heat-conducting pipe 32. The outer heat-conducting pipe 32 and the inner heat-conducting pipe 33 are used to absorb the waste heat of the flue gas in the heat exchange box 5 and heat the fluid in the outer heat-conducting pipe 32 and the inner heat-conducting pipe 33. The fluid in the outer heat-conducting pipe 32 and the inner heat-conducting pipe 33 enters the fluid temporary storage tank 34 for temporary storage. When needed, the heat in the fluid temporary storage tank 34 is utilized. The fluid heating system 3 also includes a pneumatic pump body 31. The pneumatic pump body 31 is used to make the fluid in the outer heat-conducting pipe 32 and the inner heat-conducting pipe 33 flow into the fluid temporary storage tank 34, and the pneumatic pump body 31 is connected to the heat exchange box 5 through a pipeline. A part of the flue gas flows into the pneumatic pump body 31 through the pipeline to drive the pneumatic pump body 31, thereby making the fluid in the outer heat-conducting pipe 32 and the inner heat-conducting pipe 33 circulate. When the flue gas generated by the aluminum melting furnace body 1 passes through the heat exchange box 5, its high-temperature waste heat is absorbed by the outer heat-conducting pipe 32 and the inner heat-conducting pipe 33. This heat is then transferred to the fluid flowing in the tube, causing the fluid temperature to rise. The fluid circulates in the outer heat conducting tube 32 and the inner heat conducting tube 33, continuously absorbing heat from the flue gas until the required temperature is reached.

[0044] The heated fluid passes through the flow path of the outer heat conducting pipe 32 and the inner heat conducting pipe 33, and finally enters the fluid temporary storage tank 34 for temporary storage. The fluid temporary storage tank 34 is used to store the heated fluid so that it can be used at any time when needed. The pneumatic pump body 31 is connected to the heat exchange box 5 and the fluid temporary storage tank 34 through a pipeline. A part of the flue gas flows into the pneumatic pump body 31 through the pipeline, and the pressure of the flue gas is used to drive the pneumatic pump body 31 to work. The operation of the pneumatic pump body 31 keeps the fluid in the outer heat conducting pipe 32 and the inner heat conducting pipe 33 circulating, ensuring the continuous heat exchange. When the heated fluid is needed, the fluid can be taken out from the fluid temporary storage tank 34 and used for other process or heating, etc. In this way, the waste heat of the flue gas generated by the aluminum melting furnace body 1 is effectively recovered and reused, achieving the purpose of energy saving and emission reduction.

[0045] A flue gas filtration and purification system 4 is also provided between the aluminum melting furnace body 1 and the heat exchange box 5. This system is used to purify harmful substances from the flue gas discharged from the aluminum melting furnace body 1 and transport the relatively clean flue gas to the heat exchange box 5 for waste heat recovery. The flue gas filtration and purification system 4 primarily purifies harmful substances, such as particulate matter and harmful gases, from the flue gas discharged from the aluminum melting furnace body 1, ensuring that the discharged flue gas meets environmental standards. Simultaneously, the system transports the purified, relatively clean flue gas to the heat exchange box 5 for waste heat recovery, thereby improving energy efficiency. The flue gas filtration and purification system 4 includes a purification tank 41, within which is placed an exhaust gas adsorption filter element 43. The exhaust gas adsorption filter element 43 is constructed using two circular filter elements. Several protrusions are also distributed on the exhaust gas adsorption filter element 43 to increase the contact area with the flue gas and its adsorption capacity. The filter element is filled with an adsorbent material (such as activated carbon, molecular sieve, etc.), which can adsorb particulate matter, residual harmful gases, and other residual gases in the flue gas, further purifying the flue gas. An exhaust gas ionizer 42 is located at the top of the exhaust gas adsorption filter 43. This ionizer 42 ionizes harmful gases into harmless substances, purifying the exhaust gas and ensuring that it meets emission standards. As the flue gas passes through the ionizer, it releases high-energy electrons or ions, which collide with harmful gas molecules in the flue gas, ionizing them into smaller molecular fragments or converting them into harmless substances. This process helps remove some harmful gases in the flue gas, such as sulfur dioxide and nitrogen oxides.

[0046] The heat exchange box 5 is also provided with a cleaning system 6. When compressed gas is introduced into the cleaning system 6, it is used to remove dust from the surface of the outer heat pipe 32 and the inner heat pipe 33 in the fluid heating system 3, so as to avoid excessive accumulation of dust in the outer heat pipe 32 and the inner heat pipe 33, which affects the efficiency of heat recovery.

[0047] The cleaning system 6 includes a cylinder 62, which is arranged at the center of the heat exchange box 5 and has a plurality of nozzles 64 distributed on the cylinder 62. A support pipe 63 is connected to the center of the cylinder 62, and a compressed gas inlet pipe 61 is movably provided at one end of the support pipe 63. The compressed gas inlet pipe 61 extends to the outside of the heat exchange box 5.

[0048] The cleaning system 6 also includes a rotary drive member 68, which is fixed to the outside of the heat exchange box 5. The output end of the rotary drive member 68 is interconnected with the cylinder 62. The rotary drive member 68 is used to drive the cylinder 62 to rotate. The cylinder 62 is connected to a hollow connecting plate 65. When compressed gas enters the cylinder 62 through the support tube 63, the nozzles 64 will evenly spray the gas. Due to the rotation of the cylinder 62, the ejected gas can form a rotating airflow, effectively removing dust from the surface of the heat pipe. The hollow connecting plate 65 is connected to a first exhaust plate 66 and a second exhaust plate 67. The first exhaust plate 66 is distributed with a plurality of first exhaust holes 661 for gas ejection. The first exhaust plate 66 is arranged between the outer heat pipe 32 and the inner heat pipe 33, and the second exhaust plate 67 is arranged outside the outer heat pipe 32. The second exhaust plate 67 is provided with second exhaust holes 671. When the rotary drive member 68 is started, it drives the cylinder 62 to rotate within the heat exchange box 5. This rotational motion helps ensure that the cleaning gas can evenly cover all surfaces of the outer heat pipe 32 and the inner heat pipe 33 .

[0049] A method for recycling flue gas from an aluminum melting furnace comprises the following steps:

[0050] S1: The staff introduces fuel into the aluminum melting furnace body 1, pours aluminum ingots or ore into the aluminum melting furnace body 1, ignites and melts. During the smelting process, the aluminum melting furnace generates a large amount of flue gas, which is generally passed into the flue gas filtration and purification system 4 through the fan provided by the aluminum melting furnace;

[0051] S2: After the flue gas enters the flue gas filtration and purification system 4, the exhaust gas adsorption filter element 43 in the flue gas filtration and purification system 4 adsorbs and filters dust. The flue gas then passes through the exhaust gas ionizer 42, which ionizes harmful gases into harmless substances, thereby purifying the exhaust gas and achieving standard emission. The flue gas then enters the heat exchange box 5 through the pipeline;

[0052] S3: Since the outer heat pipe 32 and the inner heat pipe 33 are spirally coiled in the heat exchange box 5, the flow path of the fluid in the outer heat pipe 32 and the inner heat pipe 33 is increased, and the outer heat pipe 32 and the inner heat pipe 33 also increase the contact area with the flue gas, so that heat is transferred to the internal fluid. A portion of the flue gas in the heat exchange box 5 flows into the pneumatic pump body 31 through the pipe. The pneumatic pump body 31 circulates the internal fluid, gradually heating the fluid in the fluid temporary storage tank 34, so that the heat in the fluid temporary storage tank 34 can be used when needed.

[0053] S4: A portion of the flue gas enters the air heating tank 23. Since the air heating tank 23 has a diverter plate 25 and a heat transfer tube 26, the residual heat in the flue gas heats the air in the diverter plate 25 and the heat transfer tube 26. The design of the diverter plate 25 and the heat transfer tube 26 increases the contact area with the flue gas, making the air heating speed faster. The flue gas passes through the pneumatic fan 22, which drives the pneumatic fan 22 to rotate, so that the hot air enters the aluminum melting furnace body 1, supporting the combustion of the fuel in the aluminum melting furnace body 1 and ensuring the stability of the furnace temperature.

[0054] S5: Although there is a filtering structure in the system, dust will still enter the heat exchange box 5. If dust accumulates on the surface of the outer heat conducting tube 32 and the inner heat conducting tube 33 on the pipeline, the compressed gas inlet pipe 61 of the cleaning system 6 contacts the source pipe, and high-pressure gas is introduced into the cylinder 62. Then, the high-pressure gas cleans the inner ring of the inner heat conducting tube 33 through the nozzle 64, and the high-pressure gas enters the first exhaust plate 66 and the second exhaust plate 67 through the hollow connecting plate 65. The high-pressure gas is ejected from the first exhaust hole 661 to clean the outer ring of the inner heat conducting tube 33 and the inner ring of the outer heat conducting tube 32. The second exhaust hole 671 cleans the outer ring of the outer heat conducting tube 32. The rotating drive member 68 is used to make the cylinder 62 rotate back and forth to clean various positions of the outer heat conducting tube 32 and the inner heat conducting tube 33 to prevent dust from affecting the heat conduction effect of the outer heat conducting tube 32 and the inner heat conducting tube 33.

[0055] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A fume recovery and utilization system for an aluminum melting furnace, characterized by: The invention comprises an aluminum melting furnace body (1), an air heating component (2) and a fluid heating system (3), wherein the air heating component (2) is arranged outside the aluminum melting furnace body (1), and the air heating component (2) uses the flue gas generated by the aluminum melting furnace body (1) to heat the air and transport the hot air into the aluminum melting furnace body (1) to assist the combustion of fuel inside the aluminum melting furnace body (1); The air heating assembly (2) includes an air heating tank (23), wherein two upper and lower diverter plates (25) are provided inside the air heating tank (23), and the diverter plates (25) are circular, and a heat transfer tube (26) is distributed between the upper and lower diverter plates (25), and a plurality of heat-conducting protrusions are evenly distributed on the outside of the heat transfer tube (26); The air heating assembly (2) further includes a pneumatic fan (22), one end of which is connected to an air inlet pipe (21), and one end of which is connected to the aluminum melting furnace body (1). The pneumatic fan (22) rotates to draw hot air in the heat transfer pipe (26) into the aluminum melting furnace body (1) to assist combustion of fuel inside the aluminum melting furnace body (1); The diverter disc (25) at the lower portion is connected to the air inlet of the pneumatic fan (22) through a pipeline, the two diverter discs (25) are detachably connected to the heat transfer tube (26), and a plurality of heat transfer tubes (26) are provided between the two diverter discs (25); The upper diverter plate (25) is connected to an air inlet (24), the air inlet (24) passes through the top of the air heating tank (23) and extends to the outside of the air heating tank (23), and the air inlet (24) is used to allow external air to enter the diverter plate (25) and be diverted to the heat transfer tube (26); The interiors of the two diverter plates (25) are hollow, allowing air to flow into the heat transfer tubes (26) for heating. The distribution of the plurality of heat transfer tubes (26) is used to increase the heating area and shorten the heating time. The power air inlet of the pneumatic fan (22) is connected to a heat exchange box (5) through a pipeline. The heat exchange box (5) recovers heat from the flue gas discharged from the aluminum melting furnace, and the heat exchange box (5) is used to transfer the heat to the corresponding heat-absorbing element in the fluid heating system (3). After the flue gas enters the heat exchange box (5), it is transported to the pneumatic fan (22) through a pipeline to drive the pneumatic fan (22) to rotate; The fluid heating system (3) is used to absorb heat from the flue gas and to heat the fluid in the fluid heating system (3). The fluid heating system (3) includes an outer heat conducting pipe (32), an inner heat conducting pipe (33) and a fluid temporary storage tank (34). The outer heat conducting pipe (32) and the inner heat conducting pipe (33) are fixed in a spiral shape inside the heat exchange box (5). One end of the outer heat conducting pipe (32) is fixedly connected to one end of the inner heat conducting pipe (33), and The inner heat conducting pipe (33) is arranged in the inner ring of the outer heat conducting pipe (32). The outer heat conducting pipe (32) and the inner heat conducting pipe (33) are used to absorb the residual heat of the flue gas in the heat exchange box (5) and heat the fluid in the outer heat conducting pipe (32) and the inner heat conducting pipe (33). The fluid in the outer heat conducting pipe (32) and the inner heat conducting pipe (33) enters the fluid temporary storage tank (34) for temporary storage. When needed, the heat in the fluid temporary storage tank (34) is used; The fluid heating system (3) further includes a pneumatic pump body (31), and the pneumatic pump body (31) is used to allow the fluid in the outer heat conducting pipe (32) and the inner heat conducting pipe (33) to flow into the fluid temporary storage tank (34), and the pneumatic pump body (31) is interconnected with the heat exchange box (5) through a pipeline, and a portion of the flue gas flows into the pneumatic pump body (31) through the pipeline to drive the pneumatic pump body (31), thereby causing the fluid in the outer heat conducting pipe (32) and the inner heat conducting pipe (33) to circulate.

2. The aluminum melting furnace fume recovery and utilization system according to claim 1, characterized in that: A flue gas filtration and purification system (4) is further provided between the aluminum melting furnace body (1) and the heat exchange box (5). The flue gas filtration and purification system (4) is used to purify harmful substances in the flue gas discharged from the aluminum melting furnace body (1) and transport the relatively clean flue gas to the heat exchange box (5) for waste heat recovery.

3. The aluminum melting furnace fume recovery and utilization system according to claim 2, characterized in that: The heat exchange box (5) is further provided with a cleaning system (6), which is used to remove dust from the surface of the outer heat conducting pipe (32) and the inner heat conducting pipe (33) in the fluid heating system (3) when compressed gas is passed through the cleaning system (6), thereby preventing excessive accumulation of dust in the outer heat conducting pipe (32) and the inner heat conducting pipe (33), which would affect the efficiency of heat recovery.

4. A method for recycling smoke from an aluminum melting furnace, utilizing the system for recycling smoke from an aluminum melting furnace according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: The staff introduces fuel into the aluminum melting furnace body (1), pours aluminum ingots or ore into the aluminum melting furnace body (1), and ignites the furnace for smelting. During smelting, the aluminum melting furnace generates a large amount of flue gas, which is generally introduced into the flue gas filtration and purification system (4) through the fan provided by the aluminum melting furnace. S2: After the flue gas enters the flue gas filtration and purification system (4), the corresponding components in the flue gas filtration and purification system (4) adsorb and purify the dust or harmful gases in the flue gas, and then the flue gas enters the heat exchange box (5); S3: Since the outer heat conducting pipe (32) and the inner heat conducting pipe (33) are spirally wound in the heat exchange box (5), the flow path of the fluid in the outer heat conducting pipe (32) and the inner heat conducting pipe (33) is increased, and the outer heat conducting pipe (32) and the inner heat conducting pipe (33) also increase the contact area with the flue gas, so that heat is transferred to the internal fluid, and a part of the flue gas in the heat exchange box (5) flows into the pneumatic pump body (31) through the pipeline, and the pneumatic pump body (31) causes the internal fluid to circulate and gradually heats the fluid in the fluid temporary storage tank (34), so that the heat in the fluid temporary storage tank (34) can be used when needed; S4: A portion of the flue gas enters the air heating tank (23). Since the air heating tank (23) has a diverter plate (25) and a heat transfer tube (26), the residual heat in the flue gas heats the air in the diverter plate (25) and the heat transfer tube (26). The design of the diverter plate (25) and the heat transfer tube (26) increases the contact area with the flue gas, making the air heating speed faster. The flue gas passes through the pneumatic fan (22) to drive the pneumatic fan (22) to rotate, so that the hot air enters the aluminum melting furnace body (1), assists the combustion of the fuel in the aluminum melting furnace body (1), and ensures the stability of the furnace temperature. S5: If dust accumulates on the surface of the outer heat conducting pipe (32) and the inner heat conducting pipe (33) on the pipeline, the outer heat conducting pipe (32) and the inner heat conducting pipe (33) are cleaned by the cleaning system (6) to prevent the dust from affecting the heat conduction effect of the outer heat conducting pipe (32) and the inner heat conducting pipe (33).

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