Magnesium metal vertical reduction furnace with double-layer vertical tank

Abstract

The invention relates to the technical field of reduction furnaces, in particular to a magnesium metal vertical reduction furnace with a double-layer vertical tank, which comprises a furnace body, an outer-layer tank body and an inner-layer tank body, a supporting structure is arranged at the bottom of the furnace body, the outer-layer tank body penetrates through the furnace body and is vertically arranged, the outer side surfaces of the top and the bottom of the outer-layer tank body are connected with the furnace body, and the bottom surface of the outer-layer tank body is connected with the supporting structure; and the inner-layer tank body is arranged in the outer-layer tank body. By arranging the double-layer vertical tank, direct impact of the inner-layer tank body on the furnace body in the charging and discharging stages is avoided, meanwhile, the weight of the vertical tank is borne by the supporting structure, and the problem that refractory materials at the furnace bottom are prone to being damaged is solved.

Description

Technical Field

[0001] This invention relates to the field of reduction furnace technology, and in particular to a double-layer vertical tank vertical reduction furnace for metallic magnesium. Background Technology

[0002] Industrially, magnesium smelting technology mainly refers to the thermal reduction method, represented by the Pidgeon process. The traditional Pidgeon process uses a horizontal reduction furnace, with the reduction vessel placed horizontally inside. However, horizontal vessel production suffers from extremely poor automation and continuity, resulting in low capacity. Furthermore, due to the large span of the horizontal vessel, it is prone to sinking, bending, and deformation under high temperatures, shortening its service life. Therefore, in recent years, vertical reduction furnaces have begun to be used in production to address the problems associated with horizontal vessels. Structurally, the vertical reduction furnace places the reduction vessel vertically inside the furnace chamber, resulting in a high degree of automation in material feeding and discharging. It has now replaced the horizontal reduction furnace as the mainstream technology.

[0003] In a vertical reduction furnace, a central tube is placed inside the vertical tank, with its bottom covering the tank's discharge port. During production, pellets are added to the area between the tank body and the central tube. After the feeding is complete, the crystallizer and furnace cover are installed sequentially. After the reaction is finished, the furnace cover is opened, and the crystallizer and central tube are removed sequentially. Simultaneously, slag flowing from the bottom of the vertical tank is collected at the furnace bottom. After the slag is discharged, the central tube and material are reintroduced for a cycle. If slag discharge is obstructed, on-site personnel need to use an overhead crane to lift the central tube and impact the vertical tank to create disturbance and allow the slag to fall. Because the vertical tank is in direct contact with the furnace body, it generates a significant impact on the furnace body during the charging and uncharting phase. The furnace top, being the weakest structure in a vertical reduction furnace, is easily damaged by the impact. Furthermore, the weight of the vertical tank and material rests on the furnace bottom lining. The refractory material of the furnace bottom experiences a significantly shortened service life due to prolonged stress at high temperatures. Maintenance of the integrated furnace bottom requires a comprehensive operation, which is not only costly in terms of materials but also extremely time-consuming. Therefore, solving the above problems is crucial for the stable production and further development of vertical reduction furnaces for metallic magnesium. Summary of the Invention

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a double-layer vertical tank vertical reduction furnace for metallic magnesium. By setting up a double-layer vertical tank, the direct impact of the inner tank on the furnace body during the charging and uncharging stage is avoided. At the same time, the weight of the vertical tank is borne by the supporting structure, which solves the problem of easy damage to the refractory material at the bottom of the furnace.

[0005] A double-layer vertical reduction furnace for magnesium metal includes a furnace body, an outer tank, and an inner tank. The bottom of the furnace body is provided with a support structure. The outer tank is vertically arranged through the furnace body. The outer surfaces of the top and bottom of the outer tank are connected to the furnace body, and the bottom surface is connected to the support structure. The inner tank is located inside the outer tank.

[0006] By setting up a double-layer vertical tank, the outer tank replaces the inner tank in hard contact with the furnace body. The outer tank can be stably and permanently fixed to the furnace body, avoiding the direct impact of the inner tank on the furnace body, especially the furnace top, during the loading and unloading stage.

[0007] Furthermore, the inner tank is located inside the outer tank, and the ground of the outer tank is connected to the support structure, which directly transmits the weight of the vertical tank to the support structure at the bottom of the furnace, where the weight is borne by the support structure, thus solving the problem of easy damage to the refractory material at the bottom of the furnace.

[0008] Furthermore, the gap between the bottom of the outer tank and the inner tank is provided with casting material to support the inner tank.

[0009] By setting up the castable material, local repairs can be carried out when the castable material is damaged, which reduces maintenance costs and time, and avoids the problems of high cost and long cycle caused by overall maintenance of the bottom of the furnace.

[0010] Furthermore, the outer tank is provided with a number of flow guide holes, and the distribution areas of the flow guide holes are located on both sides of the outer tank facing the burner.

[0011] By setting guide holes facing both sides of the burner, the airflow direction of the high-temperature flue gas is followed, allowing the airflow to enter the outer tank through the guide holes and exchange heat with the inner tank, thereby improving the reduction reaction efficiency.

[0012] Furthermore, the distribution area of ​​the flow guide holes corresponds to the width of the inner tank.

[0013] By matching the distribution area of ​​the guide holes with the width of the inner tank, the airflow can directly scour the inner tank for heat exchange, improving the reduction reaction efficiency and avoiding the problem of insufficient heat exchange caused by the airflow having no obstruction and low resistance when the guide holes are located in other positions.

[0014] Furthermore, the plurality of guide holes are evenly distributed within the distribution area.

[0015] Furthermore, the distribution area of ​​the guide holes has several layers of guide holes arranged vertically, with one guide hole on one side and two guide holes on the other side in each layer, and the number of guide holes in each layer on the same side is alternately arranged.

[0016] By setting the number and position of the guide holes, it is beneficial to increase the uniformity of airflow and further improve the efficiency of the reduction reaction.

[0017] The beneficial effects of this invention are: The present invention discloses a double-layer vertical tank vertical reduction furnace for metallic magnesium. By setting up a double-layer vertical tank, the outer tank replaces the inner tank and makes hard contact with the furnace body. The outer tank can be stably and fixedly installed in the furnace body for a long time, avoiding the direct impact of the inner tank on the furnace body, especially the furnace top, during the charging and uncharging stage.

[0018] Furthermore, the inner tank is located inside the outer tank, and the ground of the outer tank is connected to the support structure, which directly transmits the weight of the vertical tank to the support structure at the bottom of the furnace, where the weight is borne by the support structure, thus solving the problem of easy damage to the refractory material at the bottom of the furnace.

[0019] By setting up the castable material, local repairs can be carried out when the castable material is damaged, which reduces maintenance costs and time, and avoids the problems of high cost and long cycle caused by overall maintenance of the bottom of the furnace.

[0020] It also features regularly spaced flow guide holes to ensure that the high-temperature flue gas flows evenly around the inner tank, improving heat exchange efficiency and temperature uniformity, thereby increasing reaction efficiency and reducing overall production energy consumption. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the current vertical reduction furnace; Figure 2 This is a schematic diagram of the structure of a double-layer vertical tank vertical reduction furnace for metallic magnesium according to the present invention; Figure 3 for Figure 2 Cross-sectional view along the AA direction; Figure 4 This is a schematic diagram of the furnace body structure of a double-layer vertical tank vertical reduction furnace for metallic magnesium according to the present invention. Figure 5 for Figure 4 Cross-sectional view along the BB direction; Figure 6 This is a schematic diagram of the outer tank structure of a double-layered vertical reduction furnace for metallic magnesium according to the present invention. Figure 7 This is a schematic diagram showing the position of the guide hole at the air inlet end of the outer tank of a double-layer vertical tank vertical reduction furnace for metallic magnesium according to the present invention. Figure 8 This is a schematic diagram showing the location of the guide hole at the gas outlet end of the outer tank of a double-layer vertical reduction furnace for metallic magnesium according to the present invention.

[0022] In the diagram: 1. Furnace body; 2. Outer tank; 3. Inner tank; 4. Support structure; 5. Castable refractory; 6. Burner; 7. Current vertical tank; 8. Central tube; 9. Guide hole. Detailed Implementation

[0023] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. To further understand the above technical solutions, exemplary embodiments of the invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0024] like Figure 1 As shown, in the current vertical reduction furnace, the existing vertical tank 7 contains a central tube 8, the bottom of which covers the tank's discharge port. During production, pellets are added to the area between the vertical tank body and the central tube 8. After the feeding is completed, the crystallizer and furnace cover are installed sequentially. After the reaction is complete, the furnace cover is opened, and the crystallizer and central tube 8 are removed sequentially. Simultaneously, slag flowing from the bottom of the vertical tank is collected at the bottom of the furnace. After the slag is discharged, the central tube 8 and material are reintroduced for recycling. If slag discharge is obstructed, on-site personnel need to use an overhead crane to lift the central tube 8 and strike the vertical tank to create disturbance and cause the slag to fall.

[0025] like Figures 2-8 As shown, a double-layer vertical reduction furnace for metallic magnesium includes a furnace body 1, an outer tank 2, and an inner tank 3. The furnace body 1 is provided with a support structure 4 at its bottom. The outer tank 2 is vertically arranged through the furnace body 1. The outer surfaces of the top and bottom of the outer tank 2 are connected to the furnace body 1, and the bottom surface is connected to the support structure 4. The inner tank 3 is located inside the outer tank 2.

[0026] By setting up a double-layer vertical tank, the outer tank 2 replaces the inner tank 3 and makes hard contact with the furnace body 1. The outer tank 2 can be stably and permanently fixed to the furnace body 1, avoiding the direct impact of the inner tank 3 on the furnace body 1, especially on the furnace top, during the loading and unloading stage.

[0027] Furthermore, the inner tank 3 is located inside the outer tank 2, and the ground of the outer tank 2 is connected to the support structure 4, so that the weight of the vertical tank is directly transferred to the support structure 4 at the bottom of the furnace body 1, and the support structure 4 bears the weight, thus solving the problem of easy damage to the refractory material at the bottom of the furnace.

[0028] Specifically, the gap between the bottom of the outer tank 2 and the inner tank 3 is provided with a casting material 5 for supporting the inner tank 3.

[0029] By setting up the castable refractory 5, it is possible to perform partial repairs when the castable refractory 5 is damaged, which reduces maintenance costs and time, and avoids the problems of high cost and long cycle caused by overall maintenance of the bottom of the furnace body 1.

[0030] Specifically, the outer tank 2 is provided with a plurality of flow guide holes 9, and the distribution areas of the flow guide holes 9 are located on both sides of the outer tank 2 facing the burner 6.

[0031] By setting guide holes 9 facing both sides of the burner 6, the airflow direction of the high-temperature flue gas is followed, so that the airflow enters the outer tank 2 through the guide holes 9 and exchanges heat with the inner tank 3, thereby improving the reduction reaction efficiency.

[0032] Specifically, the distribution area of ​​the flow guide hole 9 corresponds to the width of the inner tank 3.

[0033] By matching the distribution area of ​​the guide holes 9 with the width of the inner tank 3, the airflow can directly scour the inner tank 3 for heat exchange, which improves the efficiency of the reduction reaction and avoids the problem of insufficient heat exchange caused by the airflow having no obstruction and low resistance when the guide holes 9 are located in other positions.

[0034] Specifically, the plurality of guide holes 9 are evenly distributed within the distribution area.

[0035] Specifically, the distribution area of ​​the guide holes 9 has several layers of guide holes 9 arranged vertically. Each layer of guide holes 9 has one guide hole 9 on one side and two guide holes 9 on the other side. The number of guide holes 9 in each layer on the same side is alternately arranged.

[0036] By setting the number and position of the guide holes 9, it is beneficial to increase the uniformity of airflow and further improve the efficiency of the reduction reaction.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A vertical magnesium reduction furnace of a double-layered vertical can, characterized by, It comprises a furnace body (1), an outer tank body (2) and an inner tank body (3), the bottom of the furnace body (1) is provided with a support structure (4), the outer tank body (2) is vertically arranged through the furnace body (1), the outer side of the top and bottom of the outer tank body (2) is connected with the furnace body (1), and the bottom is connected with the support structure (4), and the inner tank body (3) is arranged in the outer tank body (2).

2. A metal magnesium vertical reduction furnace of a double-layered vertical can type according to claim 1, characterized in that: The gap between the bottom of the outer tank body (2) and the inner tank body (3) is provided with castable (5) for supporting the inner tank body (3).

3. A double vertical magnesium metal reduction cell as claimed in claim 1, wherein: The outer tank body (2) is provided with a plurality of flow guide holes (9), and the distribution areas of the flow guide holes (9) are located on the two sides of the outer tank body (2) facing the burner (6) respectively.

4. A metal magnesium vertical reduction furnace of a double-layered vertical can type according to claim 3, characterized in that: The distribution area of the flow guide hole (9) corresponds to the width of the inner tank body (3).

5. A metal magnesium vertical reduction reactor of a double vertical can type according to claim 4, characterized in that: The plurality of flow guide holes (9) are uniformly distributed in the distribution area.

6. A metal magnesium vertical reduction reactor of a double vertical can type according to claim 5, characterized in that: The distribution area of the flow guide hole (9) is arranged in the vertical direction, and a plurality of layers of flow guide holes (9) are arranged in the distribution area of the flow guide hole (9), one flow guide hole (9) is arranged on one side of each layer of flow guide holes (9), and two flow guide holes (9) are arranged on the other side, and the number of each layer of flow guide holes (9) on the same side is alternately arranged.

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