Secondary aluminum ash heat accumulating type melting device

Abstract

The invention relates to the technical field of aluminum recovery equipment, in particular to a secondary aluminum ash heat storage type melting device which comprises a kiln, a combustion mechanism, a heat storage mechanism and a circulation mechanism. A hearth in the kiln is used for melting secondary aluminum ash, and a first smoke pipe and a second smoke pipe are arranged on the two sides to discharge high-temperature smoke. A first combustor and a second combustor of the combustion mechanism alternately work to supply heat to the hearth. High-temperature smoke enters the first heat accumulator and the second heat accumulator through smoke pipes, heat is transferred to heat accumulation media, waste heat recovery is achieved, and low-temperature smoke is exhausted. The circulating mechanism sucks air through an air inlet fan, the air passes through a concentric-square-shaped pipeline and is controlled by a first three-way valve and a second three-way valve to flow into the heat accumulator to be subjected to heat exchange with a heat accumulation medium to become preheated air, and then the preheated air returns to the kiln to support combustion of the combustor. According to the device, waste heat is recycled through the heat storage mechanism to preheat combustion-supporting air, air recycling is achieved through the circulation mechanism, secondary aluminum ash melting can be efficiently completed, the preheating utilization rate of the kiln is effectively increased, the combustion efficiency is improved, and fuel consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum recycling equipment, and more specifically, to a regenerative melting device for secondary aluminum ash. Background Art

[0002] Aluminum ash is the dross and skim floating on the upper layer of molten aluminum during the smelting processes of electrolytic aluminum, casting aluminum, and recycled aluminum, including the residue remaining after subsequent processes such as ash frying and ball milling. According to the production and processing flow of recycling aluminum from aluminum ash, aluminum ash is divided into primary aluminum ash, secondary aluminum ash, and waste aluminum ash. As metal aluminum is melted and recycled repeatedly, the metal aluminum content in aluminum ash gradually decreases. The metal aluminum content in primary aluminum ash is high, with an aluminum content of 15% to 75%. The metal aluminum content in secondary aluminum ash is relatively low, with an aluminum content of 5% to 20%. Currently, secondary aluminum ash can be recycled on a large scale through pyrometallurgical combustion in industry. However, the flue gas generated by burning secondary aluminum ash has a temperature as high as about 1000°C. The flue gas components contain mechanical compounds and various salts generated during the refining of molten aluminum, with strong erosion properties. At the same time, it is also mixed with a large amount of dust, making waste gas treatment quite difficult. In addition, the high-temperature flue gas of existing aluminum melting furnaces has low waste heat recovery and utilization efficiency, resulting in extremely high energy consumption in production. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a regenerative melting device for secondary aluminum ash, aiming to provide a melting device with high waste heat utilization efficiency during the combustion of secondary aluminum ash and good waste gas treatment effect.

[0004] According to an embodiment of the present invention, a regenerative melting device for secondary aluminum ash includes:

[0005] A kiln furnace, with a hearth arranged inside the kiln furnace; a first flue pipe and a second flue pipe are respectively arranged on both sides of the kiln furnace, and the first flue pipe and the second flue pipe are respectively communicated with the hearth;

[0006] A combustion mechanism, which is provided with a first burner and a second burner; the first burner and the second burner are respectively installed on both sides of the kiln furnace; the end parts of the first burner and the second burner respectively extend into the hearth;

[0007] A heat storage mechanism, which is provided with a first heat storage device and a second heat storage device. The first heat storage device is provided with a first air exchange port and a second air exchange port, and the second heat storage device is provided with a third air exchange port and a fourth air exchange port; the first air exchange port is communicated with the first flue pipe, and the third air exchange port is communicated with the second flue pipe;

[0008] Circulation mechanism, the circulation mechanism is provided with a loop-shaped pipeline, and an intake fan and an exhaust fan are arranged on the loop-shaped pipeline; the second air exchange port is communicated with the loop-shaped pipeline through a first three-way valve; the fourth air exchange port is communicated through a second three-way valve.

[0009] According to some embodiments of the present invention, both the first burner and the second burner are provided with an outer cylinder and a gas pipe; the outer cylinder of the first burner is communicated with the first smoke pipe; the outer cylinder of the second burner is communicated with the second smoke pipe; the outer cylinder is coaxially sleeved on the gas pipe.

[0010] According to some embodiments of the present invention, a Venturi structure is arranged at the end of the gas pipe.

[0011] According to some embodiments of the present invention, a duckbill nozzle is arranged at the end of the outer cylinder.

[0012] According to some embodiments of the present invention, the first three-way valve and the second three-way valve divide the loop-shaped pipeline into a first circulation pipe and a second circulation pipe, the intake fan is communicated with the first circulation pipe, and the exhaust fan is communicated with the second circulation pipe.

[0013] According to some embodiments of the present invention, both the first heat accumulator and the second heat accumulator are provided with a frame body and an outer shell body, the outer shell body is fixedly connected with the frame body, and n heat storage cavities are arranged in the outer shell body, where n is an odd number greater than 1; horizontally adjacent outer shell bodies are communicated through n - 1 connecting pipes, and the horizontally adjacent connecting pipes are distributed on the upper and lower sides of the outer shell body, and a heat storage body is arranged in each heat storage cavity.

[0014] According to some embodiments of the present invention, a buffer plate is arranged on the outer peripheral side of the heat storage body, a buffer spring is arranged on the buffer plate, and one end of the buffer spring abuts against the inner peripheral wall of the outer shell body; the outer shell body is provided with a conical structure at the upper and lower ends of each heat storage cavity.

[0015] According to some embodiments of the present invention, a vibration motor is arranged on the outer shell body.

[0016] According to some embodiments of the present invention, elastic pipe joints are arranged at the first air exchange port, the second air exchange port, the third air exchange port, and the fourth air exchange port.

[0017] According to some embodiments of the present invention, the heat storage body is a ceramic heat storage body, and a plurality of honeycomb-shaped holes are arranged in the heat storage body along the vertical direction.

[0018] According to an aluminum dross heat storage melting device according to an embodiment of the present invention, it has at least the following beneficial effects:

[0019] According to the solution of the present invention, the secondary aluminum ash regenerative melting device includes a kiln, a combustion mechanism, a heat storage mechanism and a circulation mechanism; wherein, a furnace chamber is arranged inside the kiln for accommodating secondary aluminum ash and performing melting treatment; a first flue and a second flue communicating with the furnace chamber are respectively arranged on both sides of the kiln for discharging high-temperature flue gas; the combustion mechanism is provided with a first burner and a second burner, which are respectively installed on both sides of the kiln, and the first burner and the second burner work alternately to provide a high-temperature heat source to melt the aluminum ash in the furnace chamber. The end of the burner extends into the furnace chamber to directly provide heat into the furnace chamber. During the heating process, the high-temperature flue gas generated in the furnace chamber will flow into the first flue and the second flue on both sides of the kiln respectively. The first flue is communicated with the first air exchange port of the first heat accumulator, and the second flue is communicated with the third air exchange port of the second heat accumulator. After the high-temperature flue gas enters the first heat accumulator and the second heat accumulator, it transfers the heat carried by itself to the heat storage medium inside the heat accumulator, so that the temperature of the heat storage medium rises, realizing the recovery of the waste heat of the flue gas. The low-temperature flue gas after heat storage then continues to be discharged. An intake air fan is arranged on the return pipe of the circulation mechanism, and the intake air fan sucks fresh air from the outside into the return pipe. The fresh air flows in the return pipe, and by controlling the opening and closing states of the first three-way valve and the second three-way valve, the fresh air will flow into the first heat accumulator and the second heat accumulator respectively. In the first heat accumulator, the fresh air exchanges heat with the heated heat storage medium and absorbs the heat stored in the heat storage medium, so that its own temperature rises to become preheated air; similarly, the other fresh air is also preheated in the second heat accumulator. The preheated air then returns to the vicinity of the kiln through the return pipe to provide combustion-supporting air for the first burner or the second burner. Since the air entering the burner is preheated air, the combustion efficiency can be improved, the fuel consumption can be reduced, and at the same time, the temperature inside the furnace chamber can be further increased, enhancing the melting effect on the secondary aluminum ash. Through the design of this structure, the waste heat of the flue gas can be recovered by the heat storage mechanism to preheat the combustion-supporting air, and then the air can be recycled by means of the circulation mechanism, so as to efficiently complete the melting process of the secondary aluminum ash and effectively improve the utilization rate of the kiln preheating.

[0020] According to the solution of the present invention, an exhaust fan and an intake air fan are respectively installed on the return pipe. The exhaust fan and the intake air fan can discharge the waste gas in the device and inject fresh air to maintain the pressure balance in the system and ensure the stable operation of the whole device. The first three-way valve and the second three-way valve can be adjusted according to the actual operation conditions to control the flow direction and flow rate of air and flue gas, so as to optimize the thermal efficiency and operation stability of the device, and improve the waste heat utilization efficiency and waste gas treatment effect. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structural diagram of the present invention;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of enlarged partial structure at position A;

[0024] Figure 4 Schematic diagram of the structure of the present invention from a top-down perspective;

[0025] Figure 5 Schematic diagram of the structure of the first burner of the present invention;

[0026] Figure 6 Schematic diagram of the structure of the first regenerator of the present invention;

[0027] Figure 7 Schematic diagram of a partial cross-section of the first regenerator of the present invention;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of enlarged partial structure at position B.

[0029] In the figure:

[0030] 100 - kiln, 101 - furnace chamber, 110 - first flue pipe, 120 - second flue pipe;

[0031] 200 - combustion mechanism, 210 - first burner, 220 - second burner, 230 - outer cylinder, 231 - duckbill nozzle, 240 - gas pipe, 241 - Venturi structure;

[0032] 300 - heat storage mechanism, 310 - first regenerator, 311 - first air exchange port, 312 - second air exchange port, 320 - second regenerator, 321 - third air exchange port, 322 - fourth air exchange port, 330 - frame, 340 - outer shell, 341 - heat storage cavity, 342 - connecting pipe, 343 - conical structure, 350 - heat storage body, 360 - buffer plate, 361 - buffer spring, 370 - vibration motor, 380 - elastic pipe joint;

[0033] 400 - circulation mechanism, 410 - loop pipeline, 411 - first circulation pipe, 412 - second circulation pipe, 420 - intake fan, 430 - exhaust fan, 440 - first three-way valve, 450 - second three-way valve. Detailed implementation manners

[0034] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0035] In the description of the present invention, it should be understood that with regard to the orientation description, such as the upper and lower directions, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, "a plurality of" means more than two. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or implicitly specifying the sequence relationship of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0038] Referring to Figure 1 the figures shown, the present invention discloses a secondary aluminum ash regenerative melting device, which includes a kiln furnace 100, a combustion mechanism 200, a heat storage mechanism 300, and a circulation mechanism 400. Among them, a hearth 101 is arranged in the kiln furnace 100. A first smoke pipe 110 and a second smoke pipe 120 are respectively arranged on both sides of the kiln furnace 100, and the first smoke pipe 110 and the second smoke pipe 120 are respectively communicated with the hearth 101. The combustion mechanism 200 is provided with a first burner 210 and a second burner 220. The first burner 210 and the second burner 220 are respectively installed on both sides of the kiln furnace 100. The end parts of the first burner 210 and the second burner 220 respectively extend into the hearth 101. The heat storage mechanism 300 is provided with a first heat accumulator 310 and a second heat accumulator 320. The first heat accumulator 310 is provided with a first air exchange port 311 and a second air exchange port 312, and the second heat accumulator 320 is provided with a third air exchange port 321 and a fourth air exchange port 322. The first air exchange port 311 is communicated with the first smoke pipe 110, and the third air exchange port 321 is communicated with the second smoke pipe 120. The circulation mechanism 400 is provided with a return pipe 410, and an intake air fan 420 and an exhaust smoke fan 430 are arranged on the return pipe 410. The second air exchange port 312 is communicated with the return pipe 410 through a first three-way valve 440. The fourth air exchange port 322 is communicated through a second three-way valve 450.

[0039] Specifically, in this embodiment, a furnace chamber 101 is provided inside the kiln 100 for accommodating secondary aluminum ash and performing melting treatment; a first flue 110 and a second flue 120 communicating with the furnace chamber 101 are respectively provided on both sides of the kiln 100 for introducing the high-temperature flue gas in the kiln 100 into the heat storage mechanism 300; the combustion mechanism 200 includes a first burner 210 and a second burner 220. The first burner 210 and the second burner 220 are respectively installed on both sides of the kiln 100, and the first burner 210 and the second burner 220 work alternately to provide a high-temperature heat source to melt the aluminum ash in the furnace chamber 101. In this embodiment, the aluminum ash is secondary aluminum ash, and the metal aluminum content of the secondary aluminum ash is relatively low, and relatively less heat is released during the combustion process. Therefore, the first burner 210 and the second burner 220 are required to provide a large amount of heat energy to melt the secondary aluminum ash. In this embodiment, the end portions of the first burner 210 and the second burner 220 respectively extend into the furnace chamber 101 from both sides of the kiln 100 to directly provide heat into the furnace chamber 101. During the heating process, the high-temperature flue gas generated in the furnace chamber 101 will sequentially flow to the first flue 110 and the second flue 120 on both sides of the kiln 100. The first flue 110 communicates with the first air exchange port 311 of the first heat storage device 310, and the second flue 120 communicates with the third air exchange port 321 of the second heat storage device 320. After the high-temperature flue gas enters the first heat storage device 310 or the second heat storage device 320, it transfers the heat carried by itself to the heat storage medium inside the heat storage device, causing the temperature of the heat storage medium to rise, thereby realizing the recovery of the waste heat of the flue gas. The low-temperature flue gas after heat storage continues to be discharged. An intake air fan 420 is provided on the return pipe 410 of the circulation mechanism 400, and the intake air fan 420 sucks in fresh air from the outside into the return pipe 410. The fresh air flows in the return pipe 410. By controlling the opening and closing states of the first three-way valve 440 and the second three-way valve 450, the fresh air will respectively flow into the first heat storage device 310 and the second heat storage device 320. In the first heat storage device 310, the fresh air exchanges heat with the heated heat storage medium and absorbs the heat stored in the heat storage medium, thereby raising its own temperature to become preheated air; similarly, the other path of fresh air is also preheated in the second heat storage device 320. The preheated air then returns to the vicinity of the kiln 100 through the return pipe 410 to provide combustion-supporting air for the first burner 210 or the second burner 220. Since the air entering the burner is preheated air, it can improve the combustion efficiency, reduce fuel consumption, and at the same time further increase the temperature in the furnace chamber 101, enhancing the melting effect on the secondary aluminum ash. Through the design of this structure, the waste heat of the flue gas can be recovered by the heat storage mechanism 300 to preheat the combustion-supporting air, and then the air can be recycled by means of the circulation mechanism 400, so as to efficiently complete the melting process of the secondary aluminum ash and effectively improve the utilization rate of the preheating of the kiln 100.

[0040] In some embodiments of the present invention, both the first burner 210 and the second burner 220 are provided with an outer cylinder 230 and a gas pipe 240; the outer cylinder 230 of the first burner 210 is communicated with the first smoke pipe 110; the outer cylinder 230 of the second burner 220 is communicated with the second smoke pipe 120; the outer cylinder 230 is coaxially sleeved on the gas pipe 240.

[0041] Specifically, in this embodiment, the gas pipes 240 of the first burner 210 and the second burner 220 are responsible for delivering gas. When the burners are operating, the gas is ejected from the gas pipes 240, mixed with the combustion-supporting air, and then ignited, thereby generating high-temperature flames to provide the required high-temperature heat source for the melting of secondary aluminum ash in the kiln 100. Since the secondary aluminum ash has a low metal aluminum content and little self-combustion heat release, the first burner 210 and the second burner 220 need to work alternately to continuously provide sufficient heat. In this embodiment, the outer cylinder 230 of the first burner 210 is connected to the first smoke pipe 110, and the outer cylinder 230 of the second burner 220 is connected to the second smoke pipe 120. During the operation of the kiln 100, the high-temperature flue gas generated in the furnace chamber 101 flows normally through the first smoke pipe 110 and the second smoke pipe 120 through the outer cylinder 230 to the regenerative mechanism 300. On the one hand, this part of the flue gas entering the outer cylinder 230 can play a certain role in cooling and protecting the burner, preventing the burner from being damaged due to being in a high-temperature environment for a long time; on the other hand, the flue gas in the outer cylinder 230 will also form a certain heat exchange with the air around the burner, causing the temperature of the air around the burner to increase. The outer cylinder 230 is coaxially sleeved on the gas pipe 240, and this structure ensures the stable layout of the burner and is also conducive to the flow of air. Under the action of the intake fan 420, the outside fresh air passes through the return pipe 410 and flows into the first regenerator 310 and the second regenerator 320 for preheating respectively by controlling the opening and closing states of the first three-way valve 440 and the second three-way valve 450. The preheated air returns to the vicinity of the kiln 100 to provide combustion-supporting air for the first burner 210 or the second burner 220. Since the outer cylinder 230 of the burner is connected to the smoke pipe, the air with a certain temperature in the outer cylinder 230 will also participate in the combustion process, further increasing the temperature of the combustion-supporting air and promoting more complete combustion of the gas. Through the design of this structure, the outer cylinder 230 of the burner is connected to the smoke pipe, and the high-temperature flue gas is used to cool the burner, extending the service life of the burner. Compared with the traditional burner directly exposed to the high-temperature furnace chamber 101 environment, this structure can effectively reduce the working temperature of the burner, reduce the risk of component damage caused by overheating, and reduce the equipment maintenance cost. The dual effects of the heat exchange between the flue gas in the outer cylinder 230 and the surrounding air and the preheating of the combustion-supporting air make the air temperature entering the burner for combustion higher. The high-temperature air can accelerate the mixing speed of the gas and the air, promoting the combustion reaction to proceed more rapidly and more fully, thereby improving the combustion efficiency. This can not only reduce fuel consumption, lower production costs, but also reduce pollutant emissions generated by incomplete combustion, being more environmentally friendly. The structural design that the outer cylinder 230 is coaxially sleeved on the gas pipe 240 makes the overall structure of the burner compact.This compact structure is conducive to the reasonable arrangement of burners within the limited space of the kiln 100, and ensures the relative position stability among the components of the burner, avoiding the displacement of components caused by factors such as vibration, which may affect the combustion effect, and improving the stability and reliability of the entire kiln 100 system. In addition, by connecting the outer cylinder 230 of the burner to the flue pipe, the utilization path of the waste heat of the high-temperature flue gas in the kiln 100 is further expanded. Part of the heat of the flue gas that might have been directly discharged is reused, which is used to protect the burner and assist in improving the combustion efficiency, making the energy utilization of the entire kiln 100 system more sufficient and improving the energy utilization rate.

[0042] In some embodiments of the present invention, a Venturi structure 241 is provided at the end of the gas pipe 240. In this embodiment, the Venturi structure 241 consists of a contraction section, a throat, and a diffusion section. When the gas sprays out from the Venturi structure 241 at the end of the gas pipe 240, in the contraction section, the flow rate of the gas gradually increases and the pressure gradually decreases; at the throat, the gas flow rate reaches the maximum and the pressure drops to the minimum. At this time, due to the low pressure at the throat, a strong suction effect will be generated. On the one hand, it can more effectively suck the combustion-supporting air in the first flue pipe 110 and the second flue pipe 120 quickly, so that the gas and the combustion-supporting air are fully mixed in the throat and the subsequent diffusion section. On the other hand, this structure helps to stabilize the jet flow pattern of the gas, ensuring that the gas is mixed with air in a relatively uniform manner, laying a foundation for the stable and sufficient combustion in the burner subsequently. In the entire kiln 100 system, whether it is the first burner 210 or the second burner 220, the Venturi structure 241 can play the above roles, ensuring the smooth progress of the combustion process. Even in the case where the combustion heat of the secondary aluminum ash is insufficient, it can better organize the combustion and provide a stable high-temperature environment for the melting of aluminum ash.

[0043] In some embodiments of the present invention, a duckbill nozzle 231 is provided at the end of the outer cylinder 230. Specifically, in this embodiment, both the first burner 210 and the second burner 220 are provided with an outer cylinder 230 and a gas pipe 240; the outer cylinder 230 of the first burner 210 is communicated with the first smoke pipe 110; the outer cylinder 230 of the second burner 220 is communicated with the second smoke pipe 120; the outer cylinder 230 is coaxially sleeved on the gas pipe 240. A Venturi structure 241 is provided at the end of the gas pipe 240. A duckbill nozzle 231 is provided at the end of the outer cylinder 230. The duckbill nozzle 231 provided at the end of the outer cylinder 230 further optimizes the combustion process. The gas in the outer cylinder 230, including high-temperature flue gas and air participating in combustion support, is ejected through the duckbill nozzle 231. The unique flat opening structure of the duckbill nozzle 231 makes the ejected air flow in a flat and diffused form, which can cover the combustion area with a larger area. This enables the combustion-supporting air to be more evenly distributed around the combustion area and better contact with the gas ejected from the end of the gas pipe 240 and fully mixed through the Venturi structure 241, thereby further promoting more sufficient and stable combustion. At the same time, the heat carried by the high-temperature flue gas ejected through the duckbill nozzle 231 can increase the initial temperature of the combustion area, contribute to maintaining the stability of combustion, and meet the requirements of the high-temperature environment for the melting of secondary aluminum ash. In summary, through the coordinated operation of components such as the Venturi structure 241 at the end of the gas pipe 240, the connection design between the outer cylinder 230 and the smoke pipe, and the duckbill nozzle 231 at the end of the outer cylinder 230, an efficient and stable combustion process is achieved, providing a reliable heat source for the melting of secondary aluminum ash in the kiln 100 and ensuring the stable operation of the equipment.

[0044] In some embodiments of the present invention, the first three-way valve 440 and the second three-way valve 450 divide the return pipe 410 into a first circulation pipe 411 and a second circulation pipe 412. The intake air blower 420 is connected to the first circulation pipe 411, and the exhaust air blower 430 is connected to the second circulation pipe 412. Specifically, in this embodiment, the heat storage mechanism 300 is provided with a first heat storage device 310 and a second heat storage device 320. The first heat storage device 310 is provided with a first air exchange port 311 and a second air exchange port 312, and the second heat storage device 320 is provided with a third air exchange port 321 and a fourth air exchange port 322. The first air exchange port 311 is connected to the first smoke pipe 110, and the third air exchange port 321 is connected to the second smoke pipe 120. The circulation mechanism 400 is provided with a return pipe 410, and an intake air blower 420 and an exhaust air blower 430 are arranged on the return pipe 410. The second air exchange port 312 is connected to the return pipe through the first three-way valve 440. The fourth air exchange port 322 is connected through the second three-way valve 450. The first three-way valve 440 and the second three-way valve 450 divide the return pipe 410 into a first circulation pipe 411 and a second circulation pipe 412. The intake air blower 420 is connected to the first circulation pipe 411, and the exhaust air blower 430 is connected to the second circulation pipe 412. Specifically, when the first burner 210 is operating, the gas pipe 240 of the first burner 210 conveys gas. The Venturi structure 241 at the end of the gas pipe 240 fully mixes the gas with the combustion-supporting air to form a combustible mixture, which is then ignited, starts to burn, and releases a large amount of heat, providing a high-temperature environment for the melting of secondary aluminum ash in the kiln 100. A part of the high-temperature flue gas generated by combustion directly participates in heat transfer in the kiln 100, and the other part flows through the first smoke pipe 110 connected to the outer cylinder 230 of the first burner 210 to the first heat storage device 310. The high-temperature flue gas enters the first air exchange port 311 of the first heat storage device 310 from the first smoke pipe 110, exchanges heat with the heat storage material inside the first heat storage device 310, stores the heat in the heat storage material, and may be discharged from the system or undergo other treatments after its own temperature decreases. At the same time, the intake air blower 420 sucks fresh air into the first circulation pipe 411, and the fresh air reaches the second air exchange port 312 through the first three-way valve 440 and enters the first heat storage device 310. Inside the first heat storage device 310, the fresh air exchanges heat with the heat storage material that has stored the heat of the high-temperature flue gas and is heated into high-temperature air. The high-temperature air then enters the second circulation pipe 412 through the second three-way valve 450, enters the second heat storage device 320 from the fourth air exchange port 322 of the second heat storage device 320, further absorbs heat, and is finally extracted by the exhaust air blower 430 and conveyed into the kiln 100 to participate in combustion, improving the combustion efficiency. After the first burner 210 has been operating for a period of time, it is switched to the second burner 220 for operation. At this time, the gas pipe 240 of the second burner 220 conveys gas, which is also mixed with the combustion-supporting air through the Venturi structure 241 at the end and then ignited to continuously provide heat for the kiln 100.The high-temperature flue gas generated by the second burner 220 flows through the second flue pipe 120 to the second regenerator 320 and enters the second regenerator 320 from the third air exchange port 321. Inside the second regenerator 320, the high-temperature flue gas exchanges heat with the heat storage material, stores the heat in the heat storage material, and the cooled flue gas is processed according to the corresponding process. The intake air fan 420 still sucks fresh air into the first circulation pipe 411. However, at this time, after passing through the first three-way valve 440, the fresh air enters the second regenerator 320 from the fourth air exchange port 322. Inside the second regenerator 320, the fresh air exchanges heat with the heat storage material that has stored the heat of the high-temperature flue gas and is heated into high-temperature air. The high-temperature air then passes through the second three-way valve 450 and enters the second circulation pipe 412, enters the first regenerator 310 from the second air exchange port 312 of the first regenerator 310, and after further absorbing heat, is extracted by the exhaust fan 430 and sent into the kiln 100 to support combustion. In this embodiment, the first burner 210 and the second burner 220 work alternately, which can ensure a continuous and stable heat supply in the kiln 100 and meet the requirements of the secondary aluminum ash melting for a high-temperature environment. At the same time, through the cooperation of the heat storage mechanism 300 and the gas circulation mechanism 400, the efficient recovery and utilization of heat are realized, and the energy utilization rate is improved. In the whole system, the two burners work alternately, and the high-temperature flue gas generated by each burner during operation enters the respective connected regenerator through the corresponding flue pipe for heat storage. The gas circulation driven by the intake air fan 420 and the exhaust fan 430 enables the fresh air to sequentially pass through the two regenerators to absorb heat during the circulation process and finally enter the kiln 100 in the form of high-temperature air to participate in combustion. This alternating working mode combined with the heat storage and circulation system not only ensures the continuity and stability of combustion but also maximally utilizes the heat generated by combustion, achieving the goal of energy-saving and efficient operation.

[0045] In some embodiments of the present invention, both the first regenerator 310 and the second regenerator 320 are provided with a frame body 330 and a housing 340. The housing 340 is fixedly connected to the frame body 330. There are n heat storage chambers 341 arranged inside the housing 340, where n is an odd number greater than 1; the horizontally adjacent housings 340 are connected by n - 1 connecting pipes 342, and the horizontally adjacent connecting pipes 342 are distributed on the upper and lower sides of the housing 340. A heat storage body 350 is respectively arranged in each heat storage chamber 341.

[0046] Specifically, in this embodiment, when the high-temperature flue gas generated by the operation of the first burner 210 or the second burner 220 enters the corresponding first regenerator 310 or the second regenerator 320, the heat storage bodies 350 in the multiple heat storage chambers 341 in the outer shell 340 start to play their roles. The heat storage bodies 350 usually adopt materials with high specific heat capacity and good heat conduction performance, such as ceramic heat storage balls, metal honeycomb heat storage bodies 350, etc. When the high-temperature flue gas flows through each heat storage chamber 341, it exchanges heat with the heat storage bodies 350, transferring heat to the heat storage bodies 350, and the temperature of the heat storage bodies 350 rises, thereby storing the heat. Through the design of the number of heat storage chambers 341, in this embodiment, the number of heat storage chambers 341 is 3, which increases the contact area and contact time between the high-temperature flue gas and the heat storage bodies 350, enabling the heat to be more fully absorbed and stored by the heat storage bodies 350. During the process of driving gas circulation by the intake fan 420 and the exhaust fan 430, low-temperature fresh air enters the regenerator. When the fresh air flows through each heat storage chamber 341, it conducts reverse heat exchange with the heat storage bodies 350 that have stored heat. The heat storage bodies 350 transfer the stored heat to the fresh air, raising the temperature of the fresh air and lowering their own temperature. In this way, after passing through a series of heat storage chambers 341, the fresh air is heated into high-temperature air, providing preheated air for the combustion in the kiln 100. Horizontally adjacent heat storage chambers 341 are connected by 2 connecting pipes 342, and the connecting pipes 342 are distributed on the upper and lower sides of the outer shell 340. This connection method enables the gas to flow evenly between the regenerator groups. When the gas enters another heat storage chamber 341 from one heat storage chamber 341, the connecting pipes 342 play a role in guiding and distributing the air flow, ensuring that the gas can flow evenly through each heat storage chamber 341, avoiding local overheating or overcooling phenomena, and ensuring the uniformity and stability of heat transfer. Through the design of this structure, the design of multiple heat storage chambers 341 increases the total volume and surface area of the heat storage bodies 350, enabling more heat to be stored. Compared with a single large-volume heat storage chamber, multiple small heat storage chambers 341 can enable the high-temperature flue gas to fully contact the heat storage bodies 350, improving the heat exchange efficiency, thereby more effectively storing the waste heat generated by combustion and reducing heat loss. Horizontally adjacent heat storage chambers 341 are connected by the connecting pipes 342 on the upper and lower sides, enabling the gas to be evenly distributed and flow within the regenerator group. This ensures that the temperature distribution of the heat storage bodies 350 in each heat storage chamber 341 is relatively uniform, avoiding a decline in the performance of the heat storage bodies 350 caused by local overheating or overcooling. At the same time, it also enables the fresh air entering the regenerator to evenly absorb heat and output high-temperature air with a relatively stable temperature, which is beneficial to the stable progress of the combustion process in the kiln 100. The outer shell 340 and the frame 330 are fixedly connected, and this structural design enhances the overall stability of the regenerator. The frame 330 can provide support for the outer shell 340, preventing the outer shell 340 from deforming or being damaged due to factors such as thermal expansion and gas pressure, and extending the service life of the regenerator.Moreover, multiple independent heat storage chambers 341 and a reasonable connection method ensure that even if individual heat storage chambers 341 or connecting pipes 342 fail, the basic functions of the entire heat accumulator will not be affected, improving the reliability of the system.

[0047] In some embodiments of the present invention, a buffer plate 360 is provided on the outer peripheral side of the heat storage body 350, and a buffer spring 361 is provided on the buffer plate 360. One end of the buffer spring 361 abuts against the inner peripheral wall of the outer casing 340; the outer casing 340 is provided with a tapered structure 343 at the upper and lower ends of each heat storage chamber 341 respectively. Specifically, in this embodiment, a buffer plate 360 is provided on the outer peripheral side of the heat storage body 350, and a buffer spring 361 is provided on the buffer plate 360. One end of the buffer spring 361 abuts against the inner peripheral wall of the outer casing 340. During the operation of the heat storage body 350, as heat is absorbed and released, thermal expansion and contraction will occur. The buffer plate 360 and the buffer spring 361 are provided to cope with this situation. When the heat storage body 350 expands due to heat, it will extrude the buffer plate 360 outwards. After the buffer plate 360 is extruded, it compresses the buffer spring 361. One end of the buffer spring 361 abuts against the inner peripheral wall of the outer casing 340, and the spring is compressed to produce elastic deformation, thereby providing a certain space for the expansion of the heat storage body 350, alleviating the pressure exerted by the heat storage body 350 on the outer casing 340 due to expansion, and protecting the outer casing 340 from being damaged by excessive extrusion. In addition, during the operation of the system, the flow of gas and the operation of the equipment may generate certain vibrations. When these vibrations are transmitted to the heat storage body 350, the buffer plate 360 and the buffer spring 361 can play a role in absorbing vibration energy. The elasticity of the buffer spring 361 can buffer the vibration, reduce the impact of the vibration on the heat storage body 350 and the outer casing 340, prevent the heat storage body 350 from loosening, shifting or even being damaged due to vibration, ensure the stability of the heat storage body 350 in the heat storage chamber 341, and thus maintain the normal progress of the heat storage process. The outer casing 340 is provided with a tapered structure 343 at the upper and lower ends of each heat storage chamber 341 respectively. The tapered structures 343 provided at the upper and lower ends of each heat storage chamber 341 of the casing play an important role in gas flow. When gas enters or exits the heat storage chamber 341, the tapered structure 343 can guide the flow direction of the gas, making the gas flow more concentrated towards the heat storage body 350 and improving the contact efficiency between the gas and the heat storage body 350. For example, during the intake process, the gas enters the tapered structure 343 from the end with a larger diameter. As the diameter of the tapered structure 343 gradually decreases, the gas flow rate increases and the flow direction becomes more concentrated, which can better impact the heat storage body 350 and enhance the heat exchange effect; during the exhaust process, the gas flows out from the end with a smaller diameter, which also helps to quickly discharge the gas exchanged with the heat storage body 350, ensuring the continuous progress of heat exchange. The tapered structure 343 can also effectively prevent impurities from accumulating at the inlet and outlet of the heat storage chamber 341. Due to the shape characteristics of the tapered structure 343, impurities are not easily retained on its surface. Even if a small amount of impurities enter, they will slide down along the tapered structure 343 under the action of gas flow, avoiding the accumulation and blockage of impurities at the inlet and outlet, ensuring the smooth flow of gas, and maintaining the normal working performance of the heat accumulator.

[0048] In some embodiments of the present invention, a vibration motor 370 is provided on the outer housing 340. The vibration motor 370 is installed on the outer housing 340. After the power is turned on, the eccentric block of the vibration motor 370 rotates at a high speed, generating a centrifugal force. This centrifugal force causes the vibration motor 370 itself to vibrate. Since the vibration motor 370 is fixedly connected to the outer housing 340, this vibration is transmitted to the outer housing 340. The vibration of the outer housing 340 is further transmitted to various internal components, including the heat storage body 350, the buffer plate 360, and the buffer spring 361, etc. For the heat storage body 350, the vibration can break the thermal resistance of the surface boundary layer, making the heat exchange between the gas and the heat storage body 350 more sufficient. During the gas flow process, a relatively stationary gas layer may originally form on the surface of the heat storage body 350, hindering the heat exchange. The vibration can break this gas layer, allowing fresh gas to continuously contact the surface of the heat storage body 350 and improving the heat exchange efficiency. At the same time, the vibration also acts on the buffer plate 360 and the buffer spring 361. The buffer plate 360 will produce small displacements and swaying under the action of vibration, which helps the buffer spring 361 better play its elastic role, further absorbing and dispersing the vibration energy, and also preventing the buffer plate 360 and the buffer spring 361 from being damaged due to fatigue under the same stress state for a long time. In addition, the vibration helps prevent impurities from accumulating inside the outer housing 340 and on the surface of the heat storage body 350. Under the action of vibration, the impurities attached to the surface of the heat storage body 350 or the inner wall of the outer housing 340 are more likely to fall off and are carried out of the heat storage device with the gas flow, maintaining the internal cleanliness, ensuring the smoothness of the gas passage, and maintaining the normal working performance of the heat storage device.

[0049] In some embodiments of the present invention, elastic pipe joints 380 are provided at the first ventilation port 311, the second ventilation port 312, the third ventilation port 321, and the fourth ventilation port 322. Through the design of this structure, during the operation of the entire heat storage and gas circulation system, each component will generate a certain displacement due to factors such as thermal expansion and contraction, and equipment vibration. For example, when the first heat storage device 310 and the second heat storage device 320 absorb and release heat, their own dimensions change, and the connecting pipe 342 also expands and contracts due to temperature changes. The elastic pipe joint 380 has good flexibility and scalability. At the first ventilation port 311, the second ventilation port 312, the third ventilation port 321, and the fourth ventilation port 322, it can effectively compensate for the displacement difference between these components. When the components expand or contract, the elastic pipe joint 380 can be stretched or compressed accordingly, ensuring the sealing and stability of the pipeline connection and preventing gas leakage.

[0050] In some embodiments of the present invention, the heat storage body 350 is a ceramic heat storage body 350, and the heat storage body 350 is provided with a plurality of honeycomb-shaped holes 351 in the vertical direction. The plurality of honeycomb-shaped holes 351 provided in the ceramic heat storage body 350 in the vertical direction greatly increases the contact area between the heat storage body 350 and the gas. When the high-temperature flue gas or low-temperature fresh air flows through the heat storage body 350 driven by the fan, the gas can penetrate into the interior of the honeycomb-shaped holes 351. Compared with the heat storage body 350 with a common structure, this honeycomb structure greatly improves the contact area between the gas and the ceramic heat storage body 350. For example, at the same volume, the surface area of the honeycomb structure may be several times or even dozens of times that of the common block structure. A larger contact area means that more heat transfer can occur between the gas and the heat storage body 350 per unit time, thereby accelerating the heat exchange speed and improving the heat storage and heat release efficiency.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A secondary aluminum ash regenerative melting device, characterized in that: include: A kiln (100), wherein a furnace (101) is provided in the kiln (100); a first smoke pipe (110) and a second smoke pipe (120) are respectively provided on both sides of the kiln (100), and the first smoke pipe (110) and the second smoke pipe (120) are respectively connected to the furnace (101); A combustion mechanism (200), wherein the combustion mechanism (200) is provided with a first burner (210) and a second burner (220); the first burner (210) and the second burner (220) are respectively installed on both sides of the kiln (100); ends of the first burner (210) and the second burner (220) respectively extend into the furnace (101); A heat storage mechanism (300), wherein the heat storage mechanism (300) is provided with a first heat storage device (310) and a second heat storage device (320); the first heat storage device (310) is provided with a first ventilation port (311) and a second ventilation port (312); the second heat storage device (320) is provided with a third ventilation port (321) and a fourth ventilation port (322); the first ventilation port (311) is connected to the first smoke pipe (110), and the third ventilation port (321) is connected to the second smoke pipe (120); A circulation mechanism (400), wherein the circulation mechanism (400) is provided with a return pipe (410), and the return pipe (410) is provided with an air intake fan (420) and a smoke exhaust fan (430); the second ventilation port (312) is connected to the return pipe (410) through a first three-way valve (440); and the fourth ventilation port (322) is connected through a second three-way valve (450).

2. The secondary aluminum ash regenerative melting device according to claim 1, characterized in that: The first burner (210) and the second burner (220) are both provided with an outer cylinder (230) and a gas pipe (240); the outer cylinder (230) of the first burner (210) is connected to the first smoke pipe (110); the outer cylinder (230) of the second burner (220) is connected to the second smoke pipe (120); the outer cylinder (230) is coaxially sleeved on the gas pipe (240).

3. The secondary aluminum ash regenerative melting device according to claim 2, characterized in that: A Venturi structure (241) is provided at the end of the gas pipe (240).

4. The secondary aluminum ash regenerative melting device according to claim 3 is characterized in that: A duckbill nozzle (231) is provided at the end of the outer cylinder (230).

5. The secondary aluminum ash regenerative melting device according to claim 1, characterized in that: The first three-way valve (440) and the second three-way valve (450) separate the return pipe (410) into a first circulation pipe (411) and a second circulation pipe (412); the air intake fan (420) is connected to the first circulation pipe (411); and the smoke exhaust fan (430) is connected to the second circulation pipe (412).

6. The secondary aluminum ash regenerative melting device according to claim 5, characterized in that: The first heat accumulator (310) and the second heat accumulator (320) are both provided with a frame (330) and an outer shell (340); the outer shell (340) and the frame (330) are fixedly connected; n heat storage chambers (341) are provided in the outer shell (340), wherein n is an odd number greater than 1; horizontally adjacent outer shells (340) are connected via n-1 connecting pipes (342), and the horizontally adjacent connecting pipes (342) are distributed on the upper and lower sides of the outer shell (340); and a heat storage body (350) is provided in each of the heat storage chambers (341).

7. The secondary aluminum ash regenerative melting device according to claim 6, characterized in that: A buffer plate (360) is provided on the outer peripheral side of the heat storage body (350), a buffer spring (361) is provided on the buffer plate (360), one end of the buffer spring (361) abuts against the inner peripheral wall of the outer shell (340); the outer shell (340) is provided with a conical structure (343) at the upper and lower ends of each heat storage cavity (341), respectively.

8. The secondary aluminum ash regenerative melting device according to claim 7, characterized in that: A vibration motor (370) is arranged on the outer shell (340).

9. The secondary aluminum ash regenerative melting device according to claim 8, characterized in that: The first ventilation port (311), the second ventilation port (312), the third ventilation port (321) and the fourth ventilation port (322) are all provided with elastic pipe joints (380).

10. The secondary aluminum ash regenerative melting device according to claim 6, characterized in that: The heat storage body (350) is a ceramic heat storage body (350), and the heat storage body (350) is provided with a plurality of honeycomb holes (351) along the vertical direction.

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