A vertical magnesium reduction furnace with double-layer vertical tank

Abstract

The present application relates to the technical fields of reduction furnace, in particular to a double-layer vertical tank metal magnesium vertical reduction furnace, which comprises a furnace body, an outer tank body and an inner tank body, the bottom of the furnace body is provided with a support structure, the outer tank body is vertically arranged through the furnace body, the outer side of the top and bottom of the outer tank body is connected with the furnace body, the bottom surface is connected with the support structure, and the inner tank body is arranged in the outer tank body. By arranging the double-layer vertical tank, the direct impact of the inner tank body on the furnace body during the loading and discharging stages is avoided, meanwhile, the weight of the vertical tank is borne by the support structure, so that the problem that the refractory material of the furnace bottom is easily damaged is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reduction furnace, in particular to a vertical magnesium reduction furnace with double-layer vertical tank. BACKGROUND

[0002] In industry, the main magnesium smelting technology is the hot reduction method represented by the Pidgeon method. The traditional Pidgeon method uses a horizontal reduction furnace, and the reduction tank is horizontally placed inside the reduction furnace. However, the horizontal tank production has poor automation and continuity, and the production capacity is low. In addition, due to the large span of the horizontal tank, it is prone to sinking and bending deformation of the tank body under high temperature environment, which shortens the service life of the tank body. In view of this, in recent years, vertical reduction furnaces have been used in production to solve the above problems of horizontal tank. The vertical reduction furnace vertically places the reduction tank inside the furnace chamber. The material adding and discharging have high automation degree, and the vertical reduction furnace has replaced the horizontal reduction furnace and become the mainstream technology.

[0003] In the vertical reduction furnace, a central pipe is arranged inside the vertical tank, and the central pipe covers the discharge port of the vertical tank at the bottom. During production, the pellets are added to the area between the vertical tank body and the central pipe. After the feeding is completed, the crystallizer and the furnace cover are installed in turn. After the reaction is completed, the furnace cover is opened, and the crystallizer is taken out in turn and the central pipe is lifted out. At the same time, the slag flowing out from the bottom of the vertical tank is collected at the bottom of the furnace. After the slag is discharged, the central pipe and the material are put in again for circulation. If the slag is not discharged smoothly, the on-site workers need to use the overhead crane to lift the central pipe to hit the vertical tank to provide disturbance to make the slag fall. Since the vertical tank is in direct contact with the furnace body, it will produce a great impact on the furnace body during the charging and discharging stages. The furnace top is the weakest structure of the vertical reduction furnace, and the impact is easy to cause damage to the furnace top. At the same time, the weight of the vertical tank and the material is placed on the furnace bottom masonry. The refractory material of the furnace bottom is significantly shortened in service life due to long-term stress in high temperature environment. The maintenance of the integrated furnace bottom requires overall operation, which not only has high material cost, but also is very time-consuming. Therefore, it is very important to solve the above problems for the stable production and progress development of the vertical magnesium reduction furnace. SUMMARY

[0004] In view of the above shortcomings and deficiencies of the prior art, the present application provides a vertical magnesium reduction furnace with double-layer vertical tank. By arranging double-layer vertical tank, the direct impact of the inner tank body on the furnace body during the charging and discharging stages is avoided, and the weight of the vertical tank is borne by the supporting structure, solving the problem of easy damage of the refractory material of the furnace bottom.

[0005] A vertical magnesium reduction furnace with double-layer vertical tank, comprising a furnace body, an outer tank body and an inner tank body, wherein the bottom of the furnace body is provided with a supporting structure, the outer tank body is vertically arranged through the furnace body, the outer side of the top and bottom of the outer tank body is connected with the furnace body, and the bottom surface is connected with the supporting structure, and the inner tank body is arranged inside the outer tank body.

[0006] By setting the double-layer vertical tank, the outer tank body replaces the inner tank body to hard contact with the furnace body, the outer tank body can be stably and fixedly installed on the furnace body for a long time, and direct impact of the inner tank body on the furnace body, especially on the furnace top, during the loading and discharging stage is avoided.

[0007] The inner tank body is arranged in the outer tank body, the ground of the outer tank body is connected with the support structure, the gravity of the vertical tank is directly transmitted to the support structure at the bottom of the furnace body, the weight is borne by the support structure, and the problem that the refractory material at the bottom of the furnace is easily damaged is solved.

[0008] Further, the gap between the bottom of the outer tank body and the inner tank body is provided with castable for supporting the inner tank body.

[0009] By setting the castable, the castable can be locally repaired when it is damaged, the maintenance cost is reduced, the maintenance time is reduced, and the problems of high cost and long cycle caused by overall maintenance of the bottom of the furnace body are avoided.

[0010] Further, the outer tank body is provided with a plurality of flow guide holes, and the distribution areas of the flow guide holes are located on the two sides of the outer tank body facing the burners.

[0011] By setting the flow guide holes on the two sides facing the burners, the flow direction of the high-temperature flue gas is conformed to, so that the flue gas enters the outer tank body from the flow guide holes and exchanges heat with the inner tank body, and the reduction reaction efficiency is improved.

[0012] Further, the distribution areas of the flow guide holes correspond to the width of the inner tank body.

[0013] By corresponding the distribution areas of the flow guide holes to the width of the inner tank body, the flue gas can directly flow and exchange heat around the inner tank body, the reduction reaction efficiency is improved, and the problem that when the flow guide holes are arranged at other positions, the flue gas path is not blocked and the resistance is small, so that the flue gas is more likely to flow, resulting in insufficient heat exchange is avoided.

[0014] Further, the plurality of flow guide holes are uniformly distributed in the distribution areas.

[0015] Further, in the distribution areas of the flow guide holes, a plurality of layers of flow guide holes are arranged in the vertical direction, one flow guide hole is arranged on one side of each layer of flow guide holes, and two flow guide holes are arranged on the other side, and the number of each layer of flow guide holes on the same side is alternately arranged.

[0016] By setting the number and position of the flow guide holes, the uniformity of the flow of the flue gas is improved, and the reduction reaction efficiency is further improved.

[0017] The beneficial effects of the present application are:

[0018] The application discloses a double-layer vertical tank metal magnesium vertical reduction furnace.

[0019] The inner tank is arranged in the outer tank, the ground of the outer tank is connected with the support structure, the gravity of the vertical tank is directly transmitted to the support structure at the bottom of the furnace body, the weight is borne by the support structure, and the problem that the refractory material at the bottom of the furnace is easily damaged is solved.

[0020] The castable is arranged, the castable can be locally repaired when the castable is damaged, maintenance cost is reduced, maintenance time is reduced, and the problems of high cost and long period caused by overall maintenance of the bottom of the furnace body are avoided.

[0021] The regular flow guide holes are further arranged, high-temperature flue gas uniformly flows around the inner tank, heat exchange efficiency and temperature division uniformity are improved, reaction efficiency is further improved, and comprehensive production energy consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the current vertical reduction furnace;

[0023] Figure 2 It is a structural schematic diagram of the double-layer vertical tank metal magnesium vertical reduction furnace;

[0024] Figure 3 It is Figure 2 It is a sectional view along the A-A direction;

[0025] Figure 4 It is a structural schematic diagram of the furnace body of the double-layer vertical tank metal magnesium vertical reduction furnace;

[0026] Figure 5 It is Figure 4 It is a sectional view along the B-B direction;

[0027] Figure 6 It is a structural schematic diagram of the outer tank of the double-layer vertical tank metal magnesium vertical reduction furnace;

[0028] Figure 7 It is a schematic diagram of the flow guide hole position of the gas inlet end of the outer tank of the double-layer vertical tank metal magnesium vertical reduction furnace;

[0029] Figure 8 It is a schematic diagram of the flow guide hole position of the gas outlet end of the outer tank of the double-layer vertical tank metal magnesium vertical reduction furnace.

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] By setting the castable 5, the castable 5 can be locally repaired when it is damaged, thereby reducing the maintenance cost and time and avoiding the problems of high cost and long cycle caused by the overall maintenance of the furnace body 1 bottom.

[0038] Specifically, 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 respectively located on the two sides of the outer tank body 2 facing the burners 6.

[0039] By setting the flow guide holes 9 on the two sides of the burners 6, the flow direction of the high-temperature flue gas is conformed to, so that the gas flow enters the outer tank body 2 from the flow guide holes 9 and exchanges heat with the inner tank body 3, thereby improving the reduction reaction efficiency.

[0040] Specifically, the distribution areas of the flow guide holes 9 correspond to the width of the inner tank body 3.

[0041] By corresponding the distribution areas of the flow guide holes 9 to the width of the inner tank body 3, the gas flow can directly flow around and exchange heat with the inner tank body 3, thereby improving the reduction reaction efficiency and avoiding the problem that when the flow guide holes 9 are arranged at other positions, the gas flow path is not blocked and the resistance is small, so that the gas flow is more likely to flow, causing insufficient heat exchange.

[0042] Specifically, the plurality of flow guide holes 9 are uniformly distributed in the distribution areas.

[0043] Specifically, in the distribution areas of the flow guide holes 9, a plurality of layers of flow guide holes 9 are arranged in the vertical direction, 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 flow guide holes 9 in each layer on the same side is alternately arranged.

[0044] By setting the number and position of the flow guide holes 9, the uniformity of the gas flow is improved, and the reduction reaction efficiency is further improved.

[0045] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A vertical reduction furnace for metallic magnesium with a double-layered vertical tank, characterized in that, The furnace includes a furnace body (1), an outer tank (2), and an inner tank (3). The furnace body (1) has a support structure (4) at its bottom. The outer tank (2) is vertically installed 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 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, reducing damage to the refractory material at the bottom of the furnace. The inner tank (3) is located inside the outer tank (2). The outer tank (2) is provided with a number 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).

2. The double-layer vertical tank vertical reduction furnace for metallic magnesium as described in claim 1, characterized in that: 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).

3. The double-layer vertical tank vertical reduction furnace for metallic magnesium as described in claim 1, characterized in that: The distribution area of ​​the flow guide hole (9) corresponds to the width of the inner tank (3).

4. A double-layered vertical tank vertical reduction furnace for metallic magnesium as described in claim 3, characterized in that: The plurality of guide holes (9) are evenly distributed within the distribution area.

5. A vertical reduction furnace for metallic magnesium with a double-layered vertical tank as described in claim 4, characterized in that: 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.

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