Nitrogen degassing and refining agent injection device for aluminum alloy refining furnace

Abstract

The utility model discloses a nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace, which comprises a nitrogen tank, the right side of the nitrogen tank is communicated with a nitrogen conveying pipeline, the surface of the nitrogen conveying pipeline is movably provided with a flow control valve, and the right end of the nitrogen conveying pipeline is communicated with an injection pipe. According to the utility model, nitrogen introduction and refining agent injection are combined, and the adsorption effect of nitrogen bubbles and the chemical reaction of a refining agent are utilized, so that hydrogen and oxide inclusions in molten aluminum can be effectively removed, an Al2O3 film is decomposed, and the purification efficiency of the molten aluminum is remarkably improved; nitrogen and a refining agent can be evenly dispersed in molten aluminum, the contact area of bubbles and the molten aluminum is increased, the adsorption efficiency of the bubbles on oxide inclusions is improved, the nitrogen and the refining agent can be preheated through the heating sleeve arranged on the blowing pipe, the refining agent is prevented from caking or blocking a pipeline due to the too low temperature, and stable operation of the device is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy refining technology, specifically to a nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace. Background Technology

[0002] During the production of aluminum alloys, molten aluminum usually contains impurities such as hydrogen and oxide inclusions. These impurities can seriously affect the quality and performance of aluminum alloys. In order to improve the quality of aluminum alloys, it is necessary to refine the molten aluminum to remove hydrogen and oxide inclusions.

[0003] Currently, common aluminum molten refining methods include air blowing and stirring, and flux refining. Air blowing and stirring mainly involves introducing an inert gas, such as nitrogen, into the aluminum molten material, using the adsorption effect of bubbles to remove hydrogen and oxide inclusions. Flux refining involves adding a refining agent to the aluminum molten material, utilizing the chemical reaction between the refining agent and impurities in the aluminum molten material to remove impurities. However, using air blowing or flux refining alone often fails to achieve the desired refining effect, and the purification efficiency needs to be further improved. Utility Model Content

[0004] The purpose of this invention is to provide a nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace, which can effectively improve the purification efficiency of molten aluminum by introducing nitrogen and working synergistically with the refining agent.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace, comprising a nitrogen tank, a nitrogen delivery pipe connected to the right side of the nitrogen tank, a flow control valve movably installed on the surface of the nitrogen delivery pipe, an injection pipe connected to the right end of the nitrogen delivery pipe, a nozzle connected to the bottom of the injection pipe, a refining agent delivery pipe connected to the right side of the top of the injection pipe, a refining agent storage tank connected to the right end of the refining agent delivery pipe, a metering device also installed in the middle of one end of the refining agent delivery pipe, and the bottom of the nozzle connected to the refining furnace body.

[0006] As a preferred embodiment, a furnace door is movably installed on the front of the refining furnace body, and a slag discharge pipe is connected to the bottom of the front of the refining furnace body. An adjusting valve plate is inserted and installed inside the slag discharge pipe, and the insertion end of the adjusting valve plate is sealed and connected to the inner wall of the slag discharge pipe.

[0007] As a preferred embodiment, a sealing block is installed on the top of the refining furnace body and outside the nozzle, a support spring is fixedly installed on the outside of the sealing block, a fixing plate is fixedly installed on the outer end of the support spring, and the bottom of the fixing plate is connected to the top of the refining furnace body.

[0008] As a preferred embodiment, a heating tube is sleeved on the outside of the blow pipe, and a heating wire is installed inside the heating tube. The heating tube is electrically connected to an external control component.

[0009] As a preferred embodiment, guide rods are fixedly installed on both the left and right sides of the top of the refining furnace body, and the upper ends of the guide rods are embedded into the interior of the sealing block and slidably connected.

[0010] As a preferred embodiment, the locking part of the sealing block is provided with an arc-shaped groove, which matches the external shape of the nozzle.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model combines nitrogen gas introduction with refining agent spraying. By utilizing the adsorption effect of nitrogen bubbles and the chemical reaction of the refining agent, it can effectively remove hydrogen and oxide inclusions from aluminum liquid and decompose the Al2O3 film, significantly improving the purification efficiency of aluminum liquid. The nozzle adopts a porous structure design, which allows nitrogen and refining agent to be evenly dispersed in aluminum liquid, increasing the contact area between bubbles and aluminum liquid, and improving the adsorption efficiency of bubbles for oxide inclusions. The heating jacket set on the spray pipe can preheat nitrogen and refining agent, preventing refining agent from clumping or clogging the pipe due to low temperature, thus ensuring the stable operation of the device.

[0013] 2. This utility model uses a guide rod on the top of the refining furnace body, the upper end of which is embedded in the sealing block and slidably connected to it. This can play a role in precise positioning when the sealing block is installed and moved, ensuring that the sealing block can accurately and reliably seal with the outside of the nozzle, avoiding the situation where the seal is not tight due to positional deviation. Attached Figure Description

[0014] Figure 1 This is a first-person perspective structural perspective view of the present invention;

[0015] Figure 2 This is a second-view perspective structural perspective view of the present invention;

[0016] Figure 3 This is a partial structural cross-sectional view of the present invention;

[0017] Figure 4 This utility model Figure 3 Enlarged view of the local structure at point A in the middle.

[0018] In the diagram: 1. Nitrogen tank; 2. Nitrogen delivery pipeline; 3. Flow control valve; 4. Refining furnace body; 5. Refining agent storage tank; 6. Refining agent delivery pipeline; 7. Metering device; 8. Injection pipe; 9. Nozzle; 10. Furnace door; 11. Slag discharge pipe; 12. Regulating valve plate; 13. Sealing block; 14. Fixing plate; 15. Support spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example

[0021] Please see Figure 1 As shown, this utility model provides a nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace, including a nitrogen tank 1, a nitrogen delivery pipe 2 connected to the right side of the nitrogen tank 1, a flow control valve 3 movably installed on the surface of the nitrogen delivery pipe 2, a spray pipe 8 connected to the right end of the nitrogen delivery pipe 2, a nozzle 9 connected to the bottom of the spray pipe 8, a refining agent delivery pipe 6 connected to the right side of the top of the spray pipe 8, a refining agent storage tank 5 connected to the right end of the refining agent delivery pipe 6, a metering device 7 also installed in the middle of one end of the refining agent delivery pipe 6, and a refining furnace body 4 connected to the bottom of the nozzle 9.

[0022] This technical solution combines nitrogen gas introduction with refining agent injection. By utilizing the adsorption effect of nitrogen bubbles and the chemical reaction of the refining agent, it can effectively remove hydrogen and oxide inclusions from the aluminum liquid and decompose the Al2O3 film, significantly improving the purification efficiency of the aluminum liquid. The nozzle 9 adopts a porous structure design, which allows nitrogen and refining agent to be evenly dispersed in the aluminum liquid, increasing the contact area between the bubbles and the aluminum liquid and improving the adsorption efficiency of the bubbles for oxide inclusions. The heating jacket set on the blowing pipe 8 can preheat the nitrogen and refining agent, preventing the refining agent from clumping or blocking the pipe due to excessively low temperature, thus ensuring the stable operation of the device. Example

[0023] Based on Embodiment 1, this utility model is as follows: Figure 1 As shown, a furnace door 10 is movably installed on the front of the refining furnace body 4, and a slag discharge pipe 11 is connected to the bottom of the front of the refining furnace body 4. An adjusting valve plate 12 is inserted into the slag discharge pipe 11, and the insertion end of the adjusting valve plate 12 is sealed to the inner wall of the slag discharge pipe 11.

[0024] Adopting such Figure 1The technical solution shown allows for easy opening and closing of the movable furnace door 10. During the aluminum alloy refining process, workers can use the furnace door 10 to inspect the furnace interior. In case of abnormal conditions such as sudden violent reactions or abnormal pressure increases, the furnace door can be quickly opened to release pressure and prevent dangerous situations such as explosions, thus ensuring the safety of operators and equipment. The slag discharge pipe 11 provides a discharge channel for the slag generated during the refining process. During aluminum alloy refining, impurities in the molten aluminum will form slag. This slag can be discharged from the furnace through the slag discharge pipe 11 to prevent excessive slag accumulation inside the furnace, which would affect the refining effect and the quality of the molten aluminum. The installation of the regulating valve plate 12 allows for precise control of the slag discharge rate. During the slag discharge process, the opening size of the slag discharge pipe 11 can be controlled by adjusting the insertion depth of the regulating valve plate 12 according to the amount of slag generated and the refining status of the molten aluminum, thereby controlling the slag discharge speed and amount.

[0025] Secondly, in the technical solution, a sealing block 13 is installed on the top of the refining furnace body 4 and outside the nozzle 9. A support spring 15 is fixedly installed on the outside of the sealing block 13. A fixing plate 14 is fixedly installed on the outer end of the support spring 15. The bottom of the fixing plate 14 is connected to the top of the refining furnace body 4. A heating tube is sleeved on the outside of the blowing pipe 8, and a heating wire is installed inside the heating tube. The heating tube is electrically connected to an external control component.

[0026] Its adoption is as follows Figure 1 The technical solution shown has a sealing block 13 that is sealed to the outside of the nozzle 9, which can effectively prevent high-temperature gas, aluminum vapor, and harmful gases generated during the refining process from leaking into the external environment. This not only helps protect the health and safety of operators, but also reduces heat loss and improves the energy utilization efficiency of the refining furnace. The support spring 15 plays a role in buffering and shock absorption. During the refining process, some vibrations may occur in the furnace, such as the impact force generated when nitrogen and refining agents are injected, and the fluctuation of aluminum liquid in the furnace. The support spring 15 can absorb these vibration energies, reduce the impact on the sealing block 13 and the nozzle 9, extend their service life, and also help maintain a tight connection between the sealing block 13 and the nozzle 9, maintaining a good sealing state. Example

[0027] This utility model is as follows Figures 1-4 As shown, guide rods are fixedly installed on both the left and right sides of the top of the refining furnace body 4, and the upper end of the guide rods is embedded in the interior of the sealing block 13 and slidably connected; the clamping part of the sealing block 13 is provided with an arc-shaped groove, which matches the external shape of the nozzle 9.

[0028] With the above technical solution, the upper end of the guide rod at the top of the refining furnace body 4 is embedded in the sealing block 13 and slidably connected to it. This can play a role in precise positioning when the sealing block 13 is installed and moved, ensuring that the sealing block 13 can accurately and reliably seal with the outside of the nozzle 9, avoiding the situation where the seal is not tight due to positional deviation.

[0029] The working principle of this invention is as follows: When refining begins, the flow control valve 3 on the nitrogen delivery pipeline 2 is opened, and nitrogen gas flows out from the nitrogen tank 1 and along the nitrogen delivery pipeline 2. The flow rate of nitrogen gas can be precisely controlled by adjusting the flow control valve 3. The refining agent storage tank 5 contains refining agents, which include components such as cryolite. The refining agent is delivered through the refining agent delivery pipeline 6. The metering device 7 is installed in the middle of the refining agent delivery pipeline 6, which can accurately control the amount of refining agent delivered, ensuring that the refining agent is added in a predetermined ratio during the refining process. The nitrogen gas with flow control and the metered refining agent converge in the injection pipe 8. Due to the flow of nitrogen gas, the refining agent is driven to flow through the nitrogen tank 1 and flow through the nitrogen delivery pipeline 2. The refining agent flows downwards together, allowing the two to mix thoroughly within the injection pipe 8. The mixed nitrogen and refining agent are then injected into the molten aluminum inside the refining furnace body 4 through the nozzle 9. The nozzle 9 is designed to disperse the nitrogen and refining agent into the molten aluminum in a suitable manner, increasing the contact area with the molten aluminum. The nitrogen injected into the molten aluminum forms a large number of tiny bubbles. As these bubbles rise, they come into full contact with the hydrogen and oxide inclusions in the molten aluminum. According to the principle of gas partial pressure, hydrogen will continuously diffuse into the nitrogen bubbles and be removed as the bubbles rise to the surface of the molten aluminum. At the same time, the surface of the bubbles can adsorb oxide inclusions and bring them to the surface of the molten aluminum, thus achieving the purpose of degassing the molten aluminum and removing oxide inclusions.

[0030] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0031] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace, comprising a nitrogen tank (1), characterized in that: The nitrogen tank (1) is connected to a nitrogen delivery pipe (2) on the right side. A flow control valve (3) is movably installed on the surface of the nitrogen delivery pipe (2). The nitrogen delivery pipe (2) is connected to a blow pipe (8) on the right end. A nozzle (9) is connected to the bottom of the blow pipe (8). A refining agent delivery pipe (6) is connected to the right side of the top of the blow pipe (8). A refining agent storage tank (5) is connected to the right end of the refining agent delivery pipe (6). A metering device (7) is also installed in the middle of one end of the refining agent delivery pipe (6). The bottom of the nozzle (9) is connected to the refining furnace body (4).

2. The nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace according to claim 1, characterized in that: A furnace door (10) is movably installed on the front of the refining furnace body (4). A slag discharge pipe (11) is connected to the bottom of the front of the refining furnace body (4). A regulating valve plate (12) is inserted into the slag discharge pipe (11). The insertion end of the regulating valve plate (12) is sealed to the inner wall of the slag discharge pipe (11).

3. The nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace according to claim 1, characterized in that: A sealing block (13) is installed on the top of the refining furnace body (4) and outside the nozzle (9). A support spring (15) is fixedly installed on the outside of the sealing block (13). A fixing plate (14) is fixedly installed on the outer end of the support spring (15). The bottom of the fixing plate (14) is connected to the top of the refining furnace body (4).

4. The nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace according to claim 1, characterized in that: The blow pipe (8) is fitted with a heating tube on the outside, and a heating wire is installed inside the heating tube. The heating tube is electrically connected to an external control component.

5. The nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace according to claim 1, characterized in that: Guide rods are fixedly installed on the left and right sides of the top of the refining furnace body (4), and the upper end of the guide rod is embedded in the interior of the sealing block (13) and slidably connected.

6. The nitrogen degassing and refining agent injection device for an aluminum alloy refining furnace according to claim 3, characterized in that: The locking part of the sealing block (13) is provided with an arc-shaped groove, which matches the external shape of the nozzle (9).

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