Energy-saving combustion and waste heat recovery system of aluminum melting furnace

Abstract

The invention relates to the field of aluminum melting furnaces, and discloses an aluminum melting furnace energy-saving combustion and waste heat recovery system which comprises a furnace body, a combustion mechanism and a waste heat recycling mechanism, a bottom plate dividing a furnace cavity into an upper smelting cavity and a lower furnace bottom cavity which are not communicated with each other is arranged in the furnace body, a smoke guide plate is arranged in the upper smelting cavity and comprises an upper arc plate, and a lower arc plate is arranged in the lower smelting cavity. A protruding plate fixed to the upper cavity wall of the upper smelting cavity is arranged on the upper surface of the upper arc plate, and a first smoke outlet and a second smoke outlet which are located above the upper arc plate and located on the two sides of the protruding plate correspondingly are formed in the side face of the furnace body. A first smoke inlet and a second smoke inlet which communicate with the lower furnace bottom cavity and are close to the two ends of the lower furnace bottom cavity correspondingly are formed in the side face of the furnace body, the first smoke outlet and the second smoke inlet are located in the same side of the protruding plate, and a first smoke guiding pipeline is arranged between the first smoke outlet and the first smoke inlet. And a second smoke guide pipeline is arranged between the second smoke outlet and the second smoke inlet.

Description

Technical Field

[0001] The invention relates to the field of metal smelting, specifically to the field of aluminum melting furnaces, and in particular to an energy-saving combustion and waste heat recovery system for aluminum melting furnaces. Background Art

[0002] Aluminum melting furnaces are used in the aluminum smelting industry. Aluminum melting furnaces include crucible type and crucible-free type. The crucible type refers to heating from the side and bottom of the aluminum melting furnace, and the crucible-free type refers to using high-temperature flames to directly heat the aluminum charge inside the aluminum melting furnace, including:

[0003] The double regenerative high-temperature air combustion technology is a heating technology used in existing crucible-free aluminum melting furnaces. Specifically, when the fuel is burning, the combustion air enters from port A, the high-temperature flue gas is discharged from port B, and the heat is accumulated in the heat storage body in the regenerator B. After a preset time, the combustion air enters from port B after heat exchange in the regenerator B, and the high-temperature exhaust gas is discharged from port A, and the heat is accumulated in the heat storage body in the regenerator A. This reciprocating process recovers the heat in the high-temperature exhaust gas to achieve the purpose of waste heat recovery and energy saving. However, this method has some shortcomings: the essence of the rest heat recovery is to achieve high-temperature flue gas and The heat exchange between the combustion air and the combustion air is carried out to preheat the combustion air. Although this waste heat recovery method can realize the full combustion of the gas and achieve the purpose of energy saving, it has little positive effect on the smelting efficiency and effect of aluminum. During the aluminum smelting process, the upper aluminum is still in close contact with the flame, and the lower aluminum is less heated by the flame. That is, after the aluminum smelting is completed, the aluminum liquid in the upper layer will be overheated. Overheating the aluminum will increase the oxidation of the aluminum liquid and increase the impurity content. Some alloy elements are also prone to volatilization or burning due to long-term high temperature, affecting the performance of the final product.

[0004] In the existing crucible aluminum melting furnace technology, for example, the Chinese invention patent application with application publication number CN117128771A discloses an aluminum melting furnace that uses flue gas waste heat to preheat waste aluminum. The furnace guides the high-temperature flue gas to exchange heat with the next batch of aluminum materials to preheat the next batch of aluminum materials. The preheated aluminum materials are easier to melt after being put into the aluminum melting furnace, thereby improving efficiency. Although this method can realize the utilization of waste heat, save energy and improve the smelting efficiency, the preheating of the aluminum materials and the subsequent smelting process will be subject to high-temperature oxidation, that is, the problem that the aluminum smelting process is easily subject to high-temperature oxidation has not been improved and solved.

[0005] Based on the above, the present invention proposes an energy-saving combustion and waste heat recovery system for an aluminum melting furnace. Summary of the invention

[0006] In order to solve the problems mentioned in the above background, the present invention provides an energy-saving combustion and waste heat recovery system for an aluminum melting furnace.

[0007] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0008] An energy-saving combustion and waste heat recovery system for an aluminum melting furnace comprises a furnace body, a combustion mechanism and a waste heat recovery mechanism. A bottom plate is arranged in the furnace body, and the bottom plate divides the furnace cavity of the furnace body into an upper smelting chamber and a lower furnace bottom chamber which are not connected to each other.

[0009] A smoke guide plate is arranged in the upper smelting chamber, and the smoke guide plate includes an upper arc plate bent downward, and a convex plate fixed to the upper cavity wall of the upper smelting chamber is arranged on the upper surface of the upper arc plate, and the two ends of the upper arc plate are respectively close to the two ends of the upper smelting chamber, and a smoke outlet located above the upper arc plate is arranged on the side of the furnace body, and two smoke outlets are arranged and respectively located on both sides of the convex plate, and the two smoke outlets are respectively a first smoke outlet and a second smoke outlet;

[0010] A smoke inlet connected to the lower furnace bottom chamber is arranged on the side of the furnace body, and two smoke inlets are arranged and are respectively close to the two ends of the lower furnace bottom chamber, and the two smoke inlets are respectively a first smoke inlet and a second smoke inlet;

[0011] The first smoke outlet and the second smoke inlet are located on the same side of the convex plate, and the waste heat recovery mechanism includes a first smoke guide pipe arranged between the first smoke outlet and the first smoke inlet and a second smoke guide pipe arranged between the second smoke outlet and the second smoke inlet.

[0012] Furthermore, a feed inlet is arranged on the side of the furnace body and a furnace cover is arranged at the feed inlet.

[0013] Furthermore, the bottom plate includes two inclined plates, the distance between the two inclined plates increases from bottom to top, the lowest points of the two inclined plates are connected by a lower arc plate, the lower arc plate is bent upward, a discharge outlet is provided on the side of the furnace body, a discharge valve is provided at the discharge outlet, and the orifice of the discharge outlet is coaxial with the lower arc plate.

[0014] Furthermore, a plurality of fins are arranged in the lower furnace bottom chamber.

[0015] Furthermore, the combustion mechanism includes two combustion assemblies respectively located on both sides of the furnace body and an air guide component for providing combustion-supporting air to the two combustion assemblies and guiding the smoke to be discharged outwardly.

[0016] Furthermore, the air-guiding component includes a reversing valve, which includes four side nozzles distributed in an array along a circumferential direction, a first connecting pipe is provided at one side nozzle, a second connecting pipe is provided at one side nozzle, a blower is provided at one side nozzle, and an induced draft fan is provided at one side nozzle. The side nozzle connected to the first connecting pipe and the side nozzle connected to the second connecting pipe are located on the same straight line, an air inlet duct is provided at the air inlet end of the blower, and a smoke exhaust duct is provided at the air outlet end of the induced draft fan.

[0017] Furthermore, the reversing valve is configured to switch between state one and state two. When the reversing valve is in state one, the first connecting pipe is connected to the blower, and the second connecting pipe is connected to the induced draft fan. When the reversing valve is in state two, the first connecting pipe is connected to the induced draft fan, and the second connecting pipe is connected to the blower.

[0018] Furthermore, the combustion assembly includes a heat storage chamber and a three-way pipe, a heat storage body is arranged in the heat storage chamber, a connecting nozzle is arranged on the upper surface of the heat storage chamber, a connecting nozzle of one combustion assembly is connected to the first connecting pipe, and a connecting nozzle of another combustion assembly is connected to the second connecting pipe, and a first air pipe is arranged at the bottom of the heat storage chamber;

[0019] The three-way pipe includes three interfaces, one interface is connected to the first gas pipe, one interface is connected to the second gas pipe and an upper one-way valve is provided at the connection, and one interface is connected to the lower furnace bottom chamber of the furnace body and a lower one-way valve is provided at the connection;

[0020] The connection between the lower furnace bottom chamber and the two combustion assemblies is close to the two flue gas inlets respectively, and a burner is provided at the end of the second gas pipe, and the flame generating end of the burner extends into the upper smelting chamber of the furnace body;

[0021] The upper one-way valve is used to allow the gas in the three-way pipe to flow in one direction into the second gas pipe, and the lower one-way valve is used to allow the gas in the lower furnace bottom chamber to flow in one direction into the three-way pipe.

[0022] Furthermore, a stirring blade is arranged in the upper smelting chamber of the furnace body, the input end of the stirring shaft of the stirring blade extends out of the furnace body and is powered by a motor, and the stirring blade is made of a heat-conducting material.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. This solution can realize waste heat recovery and energy saving. Specifically, this solution guides the unused flame heat in the upper smelting chamber to flow into the lower furnace bottom chamber, and heats the aluminum material from bottom to top, thereby achieving the effect of waste heat recovery and improving smelting efficiency. Compared with the prior art mentioned in the background technology, this solution can also effectively reduce the time of high-temperature oxidation of the aluminum material, thereby solving the problem caused by high-temperature oxidation of the aluminum material. After that, the heat follows the flue gas through the combustion component on the other side, and is discharged only after heat exchange with the heat storage body. Therefore, the waste heat recovery rate of this solution is more obvious and further improved;

[0025] 2. During the smelting process of aluminum, the aluminum is heated from top to bottom by the flame, and also from bottom to top by the high-temperature flue gas in the lower furnace chamber. With the stirring blades, the heat can be transferred to each part of the aluminum faster, so that each part of the aluminum is heated relatively evenly, avoiding a part of the aluminum from being oxidized by high temperature for a long time.

[0026] Furthermore, in the process of guiding the high-temperature flue gas to flow into the lower furnace bottom chamber, it is well known that when the flame is burning, the flame is the area with the most intense combustion reaction and the highest temperature, and the root of the flame is mainly the preheating and decomposition area of ​​the fuel, providing continuous combustible gas for combustion, and the temperature is relatively lower. Therefore, when the flame is burning, the temperature on the flame side is higher than the temperature on the flame root side. In this scheme, the high-temperature flue gas is introduced into the lower furnace bottom chamber, close to the flame root side. On the one hand, the heat exchange effect is improved by increasing the temperature difference between the high-temperature flue gas and the aluminum material, and the waste heat utilization rate is improved. On the other hand, the aluminum material close to the flame side and the aluminum material close to the root side are heated relatively evenly as much as possible, thereby improving the heat conduction efficiency, thereby improving the smelting efficiency and further improving the effect of reducing the high-temperature oxidation of the aluminum material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0029] Figure 3 is a schematic diagram of the structure of the gas guide component;

[0030] Figure 4 It is a structural schematic diagram of the reversing valve;

[0031] Figure 5 Cross-section of the furnace body and combustion components Figure 1 ;

[0032] Figure 6 Cross-section of the furnace body and combustion components Figure 2 ;

[0033] Figure 7 is a schematic diagram of a furnace body and a combustion assembly;

[0034] Figure 8 A partial schematic diagram of the combustion component.

[0035] The reference numerals in the accompanying drawings are:

[0036] 100, furnace body; 101, furnace cover; 102, discharge valve; 103, first smoke guide pipe; 104, second smoke guide pipe; 105, bottom plate; 106, smoke guide plate; 1061, convex plate; 107, first smoke outlet; 108, second smoke outlet; 109, first smoke inlet; 110, second smoke inlet; 111, fin; 112, stirring blade; 113, motor; 200, gas guide structure Components; 201, blower; 202, air inlet duct; 203, induced draft fan; 204, smoke exhaust duct; 205, first connecting pipe; 206, second connecting pipe; 207, reversing valve; 300, combustion assembly; 301, heat storage chamber; 302, heat storage body; 303, three-way pipe; 304, first air pipe; 305, upper one-way valve; 306, second air pipe; 307, burner; 308, lower one-way valve. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0038] Reference Figure 1-Figure 8 , an energy-saving combustion and waste heat recovery system for an aluminum melting furnace, including a furnace body 100, a combustion mechanism and a waste heat recovery mechanism.

[0039] A feed inlet is arranged on the side of the furnace body 100 and a furnace cover 101 is arranged at the feed inlet, and aluminum material is fed into the furnace body 100 through the feed inlet. A bottom plate 105 close to the furnace bottom is arranged in the furnace body 100, and the bottom plate 105 includes two inclined plates, and the distance between the two inclined plates increases from bottom to top. The lowest points of the two inclined plates are connected by a lower arc plate, and the lower arc plate is bent upward. A discharge outlet is arranged on the side of the furnace body 100, and a discharge valve 102 is arranged at the discharge outlet. When the discharge valve 102 is opened, the smelted aluminum liquid can be discharged to the outside.

[0040] The bottom plate 105 divides the furnace chamber of the furnace body 100 into an upper smelting chamber and a lower furnace bottom chamber which are not connected to each other.

[0041] A smoke guide plate 106 is arranged in the upper smelting chamber, and the smoke guide plate 106 includes an upper arc plate bent downward, and a convex plate 1061 is arranged on the upper surface of the upper arc plate, and the convex plate 1061 is fixedly connected to the upper cavity wall of the upper smelting chamber, and vertical plates are extended downward at both ends of the upper arc plate, and the vertical plates are close to the corresponding side walls of the upper smelting chamber. A smoke outlet is arranged on the side of the furnace body 100, and the smoke outlet is located above the upper arc plate. There are two smoke outlets and they are respectively located on both sides of the convex plate 1061, and the two smoke outlets are respectively a first smoke outlet 107 and a second smoke outlet 108.

[0042] A flue gas inlet connected to the lower furnace bottom chamber is arranged on the side of the furnace body 100. Two flue gas inlets are arranged and are respectively close to the highest points of the two inclined plates. The two flue gas inlets are respectively a first flue gas inlet 109 and a second flue gas inlet 110. Preferably, a plurality of fins 111 are arranged in the lower furnace bottom chamber.

[0043] The first smoke outlet 107 and the second smoke inlet 110 are located on the same side of the convex plate 1061, and the waste heat recovery mechanism includes a first smoke guide pipe 103 arranged between the first smoke outlet 107 and the first smoke inlet 109, and a second smoke guide pipe 104 arranged between the second smoke outlet 108 and the second smoke inlet 110; the waste heat recovery mechanism can not only realize the waste heat utilization and improve the smelting efficiency of aluminum materials, but also effectively reduce the oxidation problem of aluminum liquid, which will be explained in detail later.

[0044] The combustion mechanism includes two combustion assemblies 300 respectively located at two sides of the furnace body 100 and an air guide member 200 for providing combustion-supporting air to the two combustion assemblies 300 and guiding the smoke to be discharged outward.

[0045] Reference Figure 3 and Figure 4 The air guide component 200 includes a reversing valve 207, and the reversing valve 207 includes four side nozzles distributed in an array along the circumferential direction. A first connecting pipe 205 is provided at one side nozzle, a second connecting pipe 206 is provided at one side nozzle, a blower 201 is provided at one side nozzle, and an induced draft fan 203 is provided at one side nozzle. In addition, the side nozzle connected to the first connecting pipe 205 and the side nozzle connected to the second connecting pipe 206 are located on the same straight line.

[0046] The reversing valve 207 is configured to switch between state one and state two. When in state one, the first connecting pipe 205 is connected to the blower 201, and the second connecting pipe 206 is connected to the induced draft fan 203. When in state two, the first connecting pipe 205 is connected to the induced draft fan 203, and the second connecting pipe 206 is connected to the blower 201.

[0047] An air intake duct 202 is provided at the air intake end of the blower 201 , and a smoke exhaust duct 204 is provided at the air outlet end of the induced draft fan 203 .

[0048] Figure 4 The specific structure of the reversing valve 207 is shown. The reversing valve 207 can be realized by the prior art and will not be described in detail.

[0049] Reference Figure 6 and Figure 8 The combustion assembly 300 includes a heat storage chamber 301 and a three-way pipe 303 .

[0050] A heat storage body 302 is arranged in the heat storage chamber 301, and a connecting nozzle is arranged on the upper surface of the heat storage chamber 301. The connecting nozzle of one combustion component 300 is connected to the first connecting pipe 205, and the connecting nozzle of another combustion component 300 is connected to the second connecting pipe 206. A first air pipe 304 is arranged at the bottom of the heat storage chamber 301.

[0051] The three-way pipe 303 includes three interfaces, one interface is connected to the first gas pipe 304, one interface is connected to the second gas pipe 306 and an upper one-way valve 305 is provided at the connection, and one interface is connected to the lower furnace bottom chamber of the furnace body 100 and a lower one-way valve 308 is provided at the connection.

[0052] The connection between the lower furnace bottom chamber and the two combustion assemblies 300 is close to the two smoke inlets respectively. A burner 307 is provided at the end of the second gas pipe 306 , and the flame generating end of the burner 307 extends into the upper smelting chamber of the furnace body 100 .

[0053] The upper one-way valve 305 is used to allow the gas in the three-way pipe 303 to flow into the second gas pipe 306 in one direction, and the lower one-way valve 308 is used to allow the gas in the lower furnace bottom chamber to flow into the three-way pipe 303 in one direction.

[0054] Working principle of the present invention:

[0055] For ease of description, Figure 5 and Figure 6 Take perspective as an example to illustrate;

[0056] The combustion-supporting air is guided by the blower 201 of the air guide member 200 in state 1 and flows into the combustion assembly 300 on the right. At the same time, the fuel gas flows into the burner 307 of the combustion assembly 300 on the right. The combustion-supporting air cooperates with the fuel gas to ignite a flame. As is known to all, when a flame burns, the flame is the area where the combustion reaction is most intense and the temperature is the highest. The root of the flame is mainly the preheating and decomposition area of ​​the fuel, providing continuous combustible gas for combustion, and the temperature is relatively low. Therefore, the aluminum material in the furnace body 100 is melted by the flame on the left side and has a higher temperature, while the temperature on the right side is relatively low.

[0057] The smoke generated by the flame combustion is generally located at the flame. Therefore, the smoke, along with the heat, flows into the lower furnace bottom chamber of the furnace body 100 through the first smoke outlet 107, the first smoke guide pipe 103 and the first smoke inlet 109, and exchanges heat with the lower layer of the aluminum material, that is, the aluminum material is heated from bottom to top, and the aluminum material is smelted in coordination with the flame. After that, the smoke is discharged to the outside through the combustion assembly 300 on the left and the smoke exhaust pipe 204 of the gas guide member 200 in state 1. At the same time, the smoke will exchange heat with the heat storage body 302 of the combustion assembly 300 on the left;

[0058] After the preset time, the air guide component 200 switches to the second state, at which time the combustion air flows into the combustion component 300 on the left, the combustion component 300 on the left ignites a flame, and the combustion component 300 on the right stops burning. The smoke and heat generated by the flame combustion flow into the lower furnace bottom chamber of the furnace body 100 through the second smoke outlet 108, the second smoke guide pipe 104 and the second smoke inlet 110, and after heat exchange with the lower layer of the aluminum material, the smoke is discharged to the outside through the combustion component 300 on the right and the smoke exhaust pipe 204 of the air guide component 200 in the second state, and at the same time, the smoke exchanges heat with the heat storage body 302 of the combustion component 300 on the right;

[0059] The above operation is repeated, and the two combustion assemblies 300 continuously and alternately ignite flames to achieve the smelting of the aluminum material.

[0060] From the above, we can know that:

[0061] 1. This solution can realize waste heat recovery and energy saving. Specifically, this solution guides the unused flame heat in the upper smelting chamber to flow into the lower furnace bottom chamber, and heats the aluminum material from bottom to top, thereby achieving the effect of waste heat recovery and improving smelting efficiency. Compared with the prior art mentioned in the background technology, this solution can also effectively reduce the time of high-temperature oxidation of the aluminum material, thereby solving the problem caused by high-temperature oxidation of the aluminum material. After that, the heat follows the flue gas through the combustion component on the other side, and is discharged only after heat exchange with the heat storage body. Therefore, the waste heat recovery rate of this solution is more obvious and further improved;

[0062] 2. During the smelting process of aluminum, the aluminum is heated from top to bottom by the flame, and also from bottom to top by the high-temperature flue gas in the lower furnace chamber. With the stirring blades, the heat can be transferred to each part of the aluminum faster, so that each part of the aluminum is heated relatively evenly, avoiding a part of the aluminum from being oxidized by high temperature for a long time.

[0063] Furthermore, in the process of guiding the high-temperature flue gas to flow into the lower furnace bottom chamber, it is well known that when the flame is burning, the flame is the area with the most intense combustion reaction and the highest temperature, and the root of the flame is mainly the preheating and decomposition area of ​​the fuel, providing continuous combustible gas for combustion, and the temperature is relatively lower. Therefore, when the flame is burning, the temperature on the flame side is higher than the temperature on the flame root side. In this scheme, the high-temperature flue gas is introduced into the lower furnace bottom chamber, close to the flame root side. On the one hand, the heat exchange effect is improved by increasing the temperature difference between the high-temperature flue gas and the aluminum material, and the waste heat utilization rate is improved. On the other hand, the aluminum material close to the flame side and the aluminum material close to the root side are heated relatively evenly as much as possible, thereby improving the heat conduction efficiency, thereby improving the smelting efficiency and further improving the effect of reducing the high-temperature oxidation of the aluminum material.

[0064] Preferred embodiment, refer to Figure 6 and Figure 7 A stirring blade 112 is provided in the upper smelting chamber of the furnace body 100. The input end of the stirring shaft of the stirring blade 112 extends out of the furnace body 100 and is powered by a motor 113. The stirring blade 112 is made of a heat-conducting material. The advantage is that, on the one hand, the stirring action of the stirring blade 112 can stir the aluminum material and improve the smelting efficiency of the aluminum material. On the other hand, the stirring blade 112 can be inserted into the aluminum material as a heat-conducting medium to further improve the heat conduction effect, thereby improving the smelting efficiency.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An energy-saving combustion and waste heat recovery system for an aluminum melting furnace, comprising a furnace body (100), a combustion mechanism and a waste heat recovery mechanism, characterized in that: A bottom plate (105) is arranged in the furnace body (100), and the bottom plate (105) divides the furnace chamber of the furnace body (100) into an upper smelting chamber and a lower furnace bottom chamber which are not connected to each other; A smoke guide plate (106) is arranged in the upper smelting chamber, the smoke guide plate (106) comprises an upper arc plate bent downward, a convex plate (1061) fixed to the upper cavity wall of the upper smelting chamber is arranged on the upper surface of the upper arc plate, two ends of the upper arc plate are respectively close to the two ends of the upper smelting chamber, a side of the furnace body (100) is provided with a smoke outlet located above the upper arc plate, two smoke outlets are arranged and are respectively located on both sides of the convex plate (1061), and the two smoke outlets are respectively a first smoke outlet (107) and a second smoke outlet (108); A smoke inlet connected to the lower furnace bottom chamber is provided on the side of the furnace body (100), and two smoke inlets are provided and are respectively close to the two ends of the lower furnace bottom chamber, and the two smoke inlets are respectively a first smoke inlet (109) and a second smoke inlet (110); The first smoke outlet (107) and the second smoke inlet (110) are located on the same side of the convex plate (1061), and the waste heat recovery mechanism comprises a first smoke guide pipe (103) arranged between the first smoke outlet (107) and the first smoke inlet (109), and a second smoke guide pipe (104) arranged between the second smoke outlet (108) and the second smoke inlet (110).

2. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 1 is characterized in that: A feed inlet is arranged on the side of the furnace body (100), and a furnace cover (101) is arranged at the feed inlet.

3. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 1 is characterized in that: The bottom plate (105) includes two inclined plates, the distance between the two inclined plates increases from bottom to top, the lowest points of the two inclined plates are connected by a lower arc plate, and the lower arc plate is bent upward. A discharge outlet is provided on the side of the furnace body (100), and a discharge valve (102) is provided at the discharge outlet. The orifice of the discharge outlet is coaxial with the lower arc plate.

4. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 1 is characterized in that: A plurality of fins (111) are arranged in the lower furnace bottom chamber.

5. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 1 is characterized in that: The combustion mechanism comprises two combustion assemblies (300) respectively located on both sides of the furnace body (100) and an air guide component (200) used for providing combustion-supporting air to the two combustion assemblies (300) and guiding smoke to be discharged outwards.

6. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 5 is characterized in that: The air guide component (200) comprises a reversing valve (207), the reversing valve (207) comprises four side nozzles arranged in an array along a circumferential direction, a first connecting pipe (205) is arranged at one side nozzle, a second connecting pipe (206) is arranged at one side nozzle, a blower (201) is arranged at one side nozzle, and an induced draft fan (203) is arranged at one side nozzle, the side nozzle connected to the first connecting pipe (205) and the side nozzle connected to the second connecting pipe (206) are located on the same straight line, an air inlet duct (202) is arranged at an air inlet end of the blower (201), and a smoke exhaust duct (204) is arranged at an air outlet end of the induced draft fan (203).

7. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 6 is characterized in that: The reversing valve (207) is configured to switch between state one and state two. When the reversing valve (207) is in state one, the first connecting pipe (205) is connected to the blower (201), and the second connecting pipe (206) is connected to the induced draft fan (203). When the reversing valve (207) is in state two, the first connecting pipe (205) is connected to the induced draft fan (203), and the second connecting pipe (206) is connected to the blower (201).

8. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 6 or 7, characterized in that: The combustion assembly (300) comprises a heat storage chamber (301) and a three-way pipe (303); a heat storage body (302) is arranged in the heat storage chamber (301); a connecting nozzle is arranged on the upper surface of the heat storage chamber (301); the connecting nozzle of one combustion assembly (300) is connected to a first connecting pipe (205); the connecting nozzle of another combustion assembly (300) is connected to a second connecting pipe (206); and a first air pipe (304) is arranged at the bottom of the heat storage chamber (301); The three-way pipe (303) includes three interfaces, one interface is connected to the first gas pipe (304), one interface is connected to the second gas pipe (306) and an upper one-way valve (305) is provided at the connection, and one interface is connected to the lower furnace bottom chamber of the furnace body (100) and a lower one-way valve (308) is provided at the connection; The connection between the lower furnace bottom chamber and the two combustion assemblies (300) is close to the two smoke inlets respectively, and a burner (307) is provided at the end of the second gas pipe (306), and the flame generating end of the burner (307) extends into the upper smelting chamber of the furnace body (100); The upper one-way valve (305) is used to allow the gas in the three-way pipe (303) to flow in one direction into the second gas pipe (306), and the lower one-way valve (308) is used to allow the gas in the lower furnace bottom chamber to flow in one direction into the three-way pipe (303).

9. The energy-saving combustion and waste heat recovery system for an aluminum melting furnace according to claim 1 or 3, characterized in that: A stirring blade (112) is arranged in the upper smelting chamber of the furnace body (100). The input end of the stirring shaft of the stirring blade (112) extends out of the furnace body (100) and is powered by a motor (113). The stirring blade (112) is made of a heat-conducting material.

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