Resistance heating type aluminum melting furnace

Abstract

The utility model discloses a resistance heating type aluminum melting furnace, which comprises a furnace wall, a furnace cover, a resistance heating device, a resistance heating device, a heating device and an aluminum melting furnace, and is characterized in that a furnace chamber with an upper opening is defined in the furnace wall; the heating section is provided with a resistance material, a heating crucible and an electrode assembly, the resistance material is arranged in the furnace chamber, the heating crucible is embedded in the resistance material, the top end of the heating crucible extends out of the resistance material and is used for containing the material, and the electrode assembly extends into the furnace chamber, is in contact with the resistance material and is used for electrifying the resistance material to enable the resistance material to generate heat. Compared with a traditional aluminum melting furnace, the aluminum melting furnace has the advantages that the heat energy utilization efficiency can be greatly improved, molten aluminum is prevented from being in direct contact with flames, the product burning rate is reduced, the situation of convective heat exchange between the molten aluminum and smoke is avoided, the molten aluminum is prevented from reacting with combustion gas components, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum recovery equipment, in particular to a resistance heating type aluminum melting furnace. Background Art

[0002] In the aluminum recycling industry, aluminum melting furnaces often use fossil fuels as heat sources, and use combustion heat and flue gas waste heat to heat the aluminum liquid. Because the aluminum blackness is too small and the radiation heat transfer capacity is very poor, the flame furnace currently uses a more common method of burning fuel through a nozzle, and the flame directly flushes and heats the aluminum liquid surface. The exhaust gas after combustion then transfers heat to the heated aluminum liquid through the rear heat exchange. In this way, the product will have a certain burnout rate, affecting the product quality; at the same time, the water vapor and gas components generated during the combustion process will react with the molten aluminum to a certain extent, thereby affecting the product quality; the thermal efficiency of the combustion-type aluminum melting is very low, and the conventional thermal efficiency is only 36%, and the energy loss is serious. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a resistance heating type aluminum melting furnace with high thermal energy utilization rate and high product quality.

[0004] The resistance heating aluminum melting furnace according to the embodiment of the utility model comprises:

[0005] A furnace wall defines a furnace cavity with an upper opening, and a furnace cover is provided on the top of the furnace cavity;

[0006] The heating section is provided with a resistor material, a heating crucible and an electrode assembly. The resistor material is arranged in the furnace cavity. The heating crucible is buried in the resistor material and the top end thereof extends out of the resistor material for accommodating the material. The electrode assembly extends into the furnace cavity and contacts the resistor material for energizing the resistor material to make the resistor material generate heat.

[0007] The resistance-heating aluminum melting furnace according to the embodiment of the utility model has at least the following beneficial effects:

[0008] By arranging an electrode assembly and a resistor material, and burying a heating crucible in the resistor material, the electrode assembly can be energized to evenly distribute the current to the resistor material. The resistor material heats up due to self-heating of the resistor. After the resistor material heats up, the wall of the heating crucible is heated by heat conduction, and the heat is transferred to the material in the heating crucible. Compared with traditional aluminum melting furnaces, the utility model can greatly improve the efficiency of thermal energy utilization, avoid direct contact between aluminum liquid and flame, reduce the burning rate of products, and there is no convection heat exchange between aluminum liquid and flue gas, avoid the reaction of aluminum liquid with combustion gas components, and improve product quality.

[0009] According to some embodiments of the present invention, a physical property preparation section is further included. The physical property preparation section is provided with a physical property preparation crucible. A conveying device is provided between the physical property preparation crucible and the heating crucible. The conveying device can convey the liquid material in the heating crucible to the physical property preparation crucible.

[0010] According to some embodiments of the present invention, there are at least two heating sections, and any one of the heating sections is arranged adjacent to the physical property preparation section.

[0011] According to some embodiments of the present invention, the physical property preparation section is further provided with a feeding crucible, and the feeding crucible is used to add materials to the heating crucible.

[0012] According to some embodiments of the utility model, the conveying device can convey the liquid material in the heating crucible to the feeding crucible, the feeding crucible is located higher than the heating crucible and is provided with a gravity pipe connected to the heating crucible, the gravity pipe is provided with a valve, and the gravity pipe is configured as follows: when the valve is opened, the liquid material in the feeding crucible can flow into the heating crucible through the gravity pipe under the action of gravity.

[0013] According to some embodiments of the present invention, the delivery device includes a pump and a delivery pipeline.

[0014] According to some embodiments of the present invention, the heating section is further provided with a first thermal insulation structure, and the first thermal insulation structure covers the electrode assembly and the resistor material.

[0015] According to some embodiments of the present invention, the material of the first thermal insulation structure includes a powder material with a particle size of 0 mm to 2 mm.

[0016] According to some embodiments of the present invention, the material of the resistor material includes a powder resistor material with a particle size of 8 mm to 30 mm.

[0017] According to some embodiments of the present invention, an insulating layer is provided between the bottom wall of the furnace cavity and the resistor material.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0021] Figure 2It is a schematic diagram of the distribution of the heating section and the physical property adjustment section of the embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the internal structure of the furnace wall of an embodiment of the utility model.

[0023] Figure Number:

[0024] Furnace wall 100, furnace cavity 101, insulation layer 102, furnace cover 110;

[0025] Heating section 200, resistor material 210, heating crucible 220, electrode assembly 230, furnace top insulation layer 240, furnace bottom insulation layer 250, furnace side insulation layer 260, electrode insulation layer 270;

[0026] The physical property preparation section 300 , the physical property preparation crucible 310 , the material adding crucible 320 , the gravity flow pipe 330 , and the second heat preservation structure 340 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the prior art, aluminum melting furnaces often use fossil fuels as heat sources, and use combustion heat and flue gas waste heat to heat aluminum liquid. The aluminum blackness is too small, and the radiation heat transfer capacity is very poor. At present, the flame furnace uses more methods to burn fuel through the nozzle, and the flame directly flushes and heats the aluminum liquid surface. The exhaust gas after combustion then transfers heat to the heated aluminum liquid through the rear heat exchange. In this way, the product will have a certain burnout rate, affecting the product quality; at the same time, the water vapor and gas components generated during the combustion process will react with the molten aluminum to a certain extent, thereby affecting the product quality; the thermal efficiency of aluminum melting by combustion is very low, and the conventional thermal efficiency is only 36%, and the energy loss is serious.

[0032] To this end, the utility model provides a resistance heating type aluminum melting furnace, which can effectively solve the above problems and improve the thermal energy utilization rate and product quality.

[0033] Reference below Figures 1 to 3 A resistance-heating aluminum melting furnace according to an embodiment of the present invention is described.

[0034] A resistance-heating aluminum melting furnace according to an embodiment of the utility model includes: a furnace wall 100 and a heating section 200.

[0035] A furnace cavity 101 with an opening on the upper side is defined inside the furnace wall 100 , and a furnace cover 110 is provided on the top of the furnace cavity 101 . Obviously, the furnace cover 110 is used to open or close the furnace cavity 101 .

[0036] The heating section 200 is provided with a resistor material 210, a heating crucible 220 and an electrode assembly 230. The resistor material 210 is arranged in the furnace chamber 101. The heating crucible 220 is buried in the resistor material 210 and the top end thereof extends out of the resistor material 210. The heating crucible 220 is used to accommodate materials, and the top end thereof extends out of the resistor material 210 to facilitate the addition of materials. It should be noted that the bottom end of the heating crucible 220 does not extend out of the resistor material 210, that is, the outer bottom wall of the heating crucible 220 is also covered with the resistor material 210. In addition, the electrode assembly 230 extends into the furnace chamber 101 and is in contact with the electrode assembly 230. The resistor material 210 is in contact with the electrode assembly 230, and the electrode assembly 230 is used to energize the resistor material 210 to make the resistor material 210 resistively heat up. Obviously, the resistor material 210 has electrical conductivity and thermal conductivity. The current is evenly distributed to the resistor material 210 through the electrode assembly 230. The resistor material 210 heats up due to the self-heating of the resistor. After the resistor material 210 heats up, the wall of the heating crucible 220 is heated by heat conduction, and the heat is transferred to the material in the heating crucible 220. Since the heating crucible 220 is buried in the resistor material 210, the resistor material 210 can evenly heat the heating crucible 220. In addition, it should be noted that the material in this embodiment is aluminum raw material. When the equipment is first operated, solid aluminum raw materials such as aluminum blocks or aluminum slag are added to the heating crucible 220, and after heating into aluminum liquid, continue to heat to overheat the aluminum liquid. Specifically, in this embodiment, the electrode assembly 230 includes two graphite electrodes, which are disposed on opposite sides of the resistor material 210. The current can be evenly distributed to the resistor material 210 through the graphite electrodes, and the overall furnace shape of the furnace wall 100 can be made larger.

[0037] The resistance-heating aluminum melting furnace of the embodiment of the utility model is provided with an electrode assembly 230 and a resistor material 210, and a heating crucible 220 is buried in the resistor material 210, so that the electrode assembly 230 can be energized to evenly distribute the current to the resistor material 210 by the electrode assembly 230. The resistor material 210 heats up due to the self-heating of the resistor. After the temperature of the resistor material 210 is increased, the wall of the heating crucible 220 is heated by heat conduction, and the heat is transferred to the material in the heating crucible 220. Compared with the traditional aluminum melting furnace, the utility model can greatly improve the thermal energy utilization efficiency, avoid direct contact between the aluminum liquid and the flame, reduce the product burning rate, and there is no situation of convective heat exchange between the aluminum liquid and the flue gas, avoid the reaction of the aluminum liquid with the combustion gas components, and improve the product quality.

[0038] Reference Figure 2 and Figure 3As shown, in some embodiments of the utility model, the resistance heating aluminum melting furnace also includes a physical property adjustment section 300, and the physical property adjustment section 300 is provided with a physical property adjustment crucible 310. A conveying device (not shown) is provided between the physical property adjustment crucible 310 and the heating crucible 220. The conveying device can transport the liquid material in the heating crucible 220 to the physical property adjustment crucible 310. The physical property adjustment crucible 310 is used to remove impurities from the superheated aluminum liquid after the heating crucible 220 is heated. A refining agent is added in the middle of the impurity removal. The refining agent is composed of salt compounds such as chloride salts and fluoride salts. The compounds in the components are used to remove impurities mixed in the aluminum liquid. By setting the physical property adjustment crucible 310 to integrate multiple functions, it is highly practical.

[0039] Reference Figure 2 As shown, in some embodiments of the utility model, at least two heating sections 200 are provided, and any heating section 200 is arranged adjacent to the physical property preparation section 300. In this way, multiple heating sections 200 can heat the aluminum raw material at the same time, and after heating, the aluminum liquid is transported to the physical property preparation crucible 310 for physical property preparation. Under the condition that the overall furnace type remains unchanged, multiple heating sections 200 are arranged separately so that each heating section 200 can evenly heat the aluminum raw material and improve the product quality. In this embodiment, two heating sections 200 are provided, which are respectively located on opposite sides of the physical property preparation section 300.

[0040] Reference Figure 2 and Figure 3As shown, in some embodiments of the present invention, the physical property preparation section 300 is further provided with a feeding crucible 320, and the feeding crucible 320 is used to add materials to the heating crucible 220. With such a configuration, after the heating crucible 220 is heated, the heating crucible 220 can be replenished with materials through the feeding crucible 320, thereby improving work efficiency. In some specific embodiments, the conveying device can convey the liquid material in the heating crucible 220 to the feeding crucible 320. The feeding crucible 320 is located higher than the heating crucible 220 and is provided with a gravity pipe 330 connected to the heating crucible 220. The gravity pipe 330 is provided with a valve, and the gravity pipe 330 is configured as follows: when the valve is opened, the liquid material in the feeding crucible 320 can flow into the heating crucible 220 through the gravity pipe 330 under the action of gravity, that is, the gravity pipe 330 is connected to the feeding crucible 320. One end of the electrode assembly 230 is higher than the end of the gravity tube 330 connected to the heating crucible 220; when the equipment is working, solid aluminum raw materials, such as aluminum blocks, aluminum slag, etc., are first added to the heating crucible 220, and solid aluminum raw materials are placed in the feeding crucible 320 for standby use. Then, the electrode assembly 230 is energized to heat the aluminum raw materials in the heating crucible 220. After the solid aluminum raw materials in the heating crucible 220 are melted into liquid, part of the aluminum liquid is transported to the feeding crucible 320 through the conveying device, so that the feeding crucible The solid aluminum raw material in the crucible 320 is melted into liquid, and then the aluminum liquid in the heating crucible 220 is continued to be heated. After heating, the aluminum liquid in the heating crucible 220 is transported to the physical property preparation crucible 310 through the conveying device for physical property preparation, and then the valve on the gravity pipe 330 is opened to allow the molten aluminum raw material in the feeding crucible 320 to flow into the heating crucible 220 through the gravity pipe 330 under the action of gravity for feeding and the next round of heating; and in the physical property preparation crucible 310 After the physical property adjustment is completed, the product is discharged and enters the later stage process; through the above arrangement, when the aluminum raw material is heated by the heating crucible 220, a part of the aluminum liquid can be conveyed to the feeding crucible 320 by the conveying device, so that the solid aluminum raw material in the feeding crucible 320 is melted into liquid in advance, and a preheating operation is performed. After the heating crucible 220 is heated and discharged, the material can be quickly replenished into the heating crucible 220 through the gravity pipe 330, which saves operation time and improves work efficiency.

[0041] In some embodiments of the utility model, the conveying device includes a pump and a conveying pipeline, and the aluminum liquid is conveyed by the pump and the conveying pipeline, which has a simple and practical structure. It can be imagined that the conveying device in this embodiment can convey the material in the heating crucible 220 to the feeding crucible 320, and can also convey the material in the heating crucible 220 to the physical property preparation crucible 310. To achieve this function, only a three-way valve needs to be set, which is a conventional technical means, so it will not be described in detail here.

[0042] Reference Figures 1 to 3As shown, in some embodiments of the utility model, the heating section 200 is further provided with a first insulation structure, and the first insulation structure covers the electrode assembly 230 and the resistor material 210. The first insulation structure is provided to prevent heat loss and ensure the utilization rate of thermal energy. Among them, the first insulation structure includes a furnace top insulation layer 240, a furnace bottom insulation layer 250, a furnace side insulation layer 260 and an electrode insulation layer 270. The furnace top insulation layer 240 covers the upper side of the resistor material 210, the furnace bottom insulation layer 250 is provided on the lower side of the resistor material 210, the furnace side insulation layer 260 is provided on the side of the resistor material 210 in the horizontal direction, and the electrode insulation layer 270 is provided between the side wall of the furnace cavity 101 and the electrode assembly 230. Each insulation layer can be provided as one layer or multiple layers, and each insulation layer can use the same insulation material or different insulation materials. The specific setting can be selected according to the actual situation. It is understandable that the material of the first thermal insulation structure includes a powder material with a particle size of 0 mm to 2 mm. Specifically, the powder material can be one of micron-sized carbon black and micron-sized calcined coke or a mixture thereof. Other thermal insulation materials can also be used according to the circumstances. In addition, the first thermal insulation structure can also be doped with some quartz sand and charcoal to enhance thermal insulation performance and air permeability. In some specific embodiments, the side of the physical property preparation crucible 310 is coated with a second thermal insulation structure 340 for heat preservation of the physical property preparation crucible 310. The second thermal insulation structure 340 can be made of the same material as the first thermal insulation structure, or a different material. In one specific embodiment, as Figures 1 to 3 As shown, the furnace bottom insulation layer 250 is provided with an upper and a lower layer, and the upper and lower layers are made of different materials. The upper furnace bottom insulation layer 250 and the furnace top insulation layer 240, the furnace bottom insulation layer 250, the furnace side insulation layer 260, and the second insulation structure 340 are made of the same material.

[0043] In some embodiments of the present invention, the material of the resistor material 210 includes a powder resistor material with a particle size of 8mm to 30mm. Specifically, the powder resistor material can be a micron-grade calcined coke material, and its particle size is greater than the particle size of the material of the first insulation structure. The conductive and thermal conductive properties of the materials will be different due to different particle sizes. The resistor material 210 has a larger particle size, a smaller contact resistance, and better conductivity, while the material of the first insulation structure has a small particle size and a large resistance, and is suitable for insulation.

[0044] Reference Figure 1 and Figure 3 As shown, in some embodiments of the present invention, an insulating layer 102 is provided between the bottom wall of the furnace chamber 101 and the resistor material 210. The insulating layer 102 may be quartz sand or other insulating materials, and its main purpose is to insulate the furnace from the outside. In some specific embodiments, the insulating layer 102 is located on the lower side of the furnace bottom insulation layer 250.

[0045] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A resistance heating aluminum melting furnace, characterized in that: include: A furnace wall (100) defines a furnace chamber (101) with an upper opening therein, and a furnace cover (110) is provided on the top of the furnace chamber (101); The heating section (200) is provided with a resistor material (210), a heating crucible (220) and an electrode assembly (230); the resistor material (210) is arranged in the furnace chamber (101); the heating crucible (220) is buried in the resistor material (210) and has a top end extending out of the resistor material (210) for accommodating the material; the electrode assembly (230) extends into the furnace chamber (101) and contacts the resistor material (210) for energizing the resistor material (210) so that the resistor material (210) generates resistance heat.

2. The resistance heating aluminum melting furnace according to claim 1, characterized in that: The invention also comprises a physical property preparation section (300), wherein the physical property preparation section (300) is provided with a physical property preparation crucible (310), and a conveying device is provided between the physical property preparation crucible (310) and the heating crucible (220), and the conveying device can convey the liquid material in the heating crucible (220) to the physical property preparation crucible (310).

3. The resistance heating aluminum melting furnace according to claim 2, characterized in that: At least two heating sections (200) are provided, and any one of the heating sections (200) is arranged adjacent to the physical property preparation section (300).

4. The resistance heating aluminum melting furnace according to claim 2, characterized in that: The physical property adjustment section (300) is also provided with a feeding crucible (320), and the feeding crucible (320) is used to add materials to the heating crucible (220).

5. The resistance heating aluminum melting furnace according to claim 4, characterized in that: The conveying device can convey the liquid material in the heating crucible (220) to the feeding crucible (320); the feeding crucible (320) is located higher than the heating crucible (220) and is provided with a gravity pipe (330) connected to the heating crucible (220); a valve is provided on the gravity pipe (330); the gravity pipe (330) is configured such that: when the valve is opened, the liquid material in the feeding crucible (320) can flow into the heating crucible (220) through the gravity pipe (330) under the action of gravity.

6. The resistance heating aluminum melting furnace according to claim 5, characterized in that: The conveying device comprises a pump and a conveying pipeline.

7. The resistance heating aluminum melting furnace according to claim 1, characterized in that: The heating section (200) is also provided with a first heat-insulating structure, and the first heat-insulating structure is arranged to cover the electrode assembly (230) and the resistor material (210).

8. The resistance heating aluminum melting furnace according to claim 7, characterized in that: The material of the first heat-insulating structure includes a powder material with a particle size of 0 mm to 2 mm.

9. The resistance heating aluminum melting furnace according to claim 1, characterized in that: The material of the resistor material (210) includes a powder resistor material with a particle size of 8 mm to 30 mm.

10. The resistance heating aluminum melting furnace according to claim 1, characterized in that: An insulating layer (102) is provided between the bottom wall of the furnace cavity (101) and the resistor material (210).

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