Furnace wall structure, metallurgical furnace and electric furnace for dri smelting process

Abstract

The utility model provides a kind of furnace wall structure, metallurgical furnace and for DRI melt separation processing electric furnace, belong to metallurgical equipment technical field. Including furnace wall body, the furnace wall body is provided with heat conducting component, the first part of the heat conducting component is inserted between the inner surface and outer surface of the furnace wall body, the second part of the heat conducting component is located at the outside of the furnace wall outer surface, cooling flow channel for circulating cooling medium is provided in the second part. The heat conducting component of the utility model can cool the furnace wall body, effectively reduce furnace wall hot face temperature, be conducive to forming slag protection layer in furnace wall hot face, to reduce the high temperature melt in the interior of metallurgical furnace, such as the erosion of refractory material, such as heat-resistant brick layer in furnace wall, with the advantages of safe use, good cooling effect, long service life of furnace wall etc..At the same time, when cooling flow channel accidentally leaks, leakage point is located at the outside of furnace wall, is conducive to avoiding that the cooling liquid of leakage enters furnace body, improves the security of metallurgical furnace.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a furnace wall structure, a metallurgical furnace, and an electric furnace for DRI melting and separation. Background Technology

[0002] In metallurgical furnaces (such as electric furnaces), the furnace walls are subjected to erosion and scouring by high-temperature molten materials such as molten slag and molten metal during production. Due to the highly complex chemical composition of slag, its erosion of the furnace walls, especially the slag-affected areas, is particularly severe. Furthermore, significant temperature variations occur during charging, smelting, slag and iron tapping, and shutdown maintenance, causing thermal shock to the refractory lining. This results in a shorter service life for the refractory lining and a high risk of slag and iron leakage accidents.

[0003] To effectively prevent refractory material erosion, some metallurgical furnaces are equipped with cooling components with cooling pipes in the furnace walls to cool the walls. This causes the molten metal to solidify and adhere to the hot surface of the furnace wall upon contact with the refractory material, forming a slag layer. This slag layer acts as a barrier between the hot refractory surface and the high-temperature molten metal, protecting the furnace wall. However, since most of the cooling pipes extend into the furnace wall, accidental leaks in these pipes can allow coolant to enter the furnace, potentially causing an explosion and posing a safety hazard. Summary of the Invention

[0004] This utility model provides a furnace wall structure, a metallurgical furnace, and an electric furnace for DRI melting and separation, in order to solve the technical problem that when the cooling pipes of the furnace wall leak accidentally, the coolant can easily enter the interior of the metallurgical furnace, causing the furnace body to explode.

[0005] This utility model provides a furnace wall structure, including a furnace wall body, on which a heat-conducting component is provided. A first part of the heat-conducting component extends between the inner and outer surfaces of the furnace wall body, and a second part of the heat-conducting component is located on the outer side of the outer surface of the furnace wall. A cooling channel for the flow of cooling medium is provided in the second part.

[0006] In one embodiment of the present invention, a graphite heat conductor is provided on the first part.

[0007] In one embodiment of the present invention, there are multiple graphite heat conductors on the heat-conducting component, and the projection of the graphite heat conductor in the thickness direction of the furnace wall body is a shielding projection, and the edges of adjacent shielding projections that are close to each other at least partially overlap.

[0008] In one embodiment of the present invention, an installation opening for installing the heat-conducting component is provided on the outer surface of the furnace wall body.

[0009] In one embodiment of the present invention, the heat-conducting component is plate-shaped, and the upper and lower surfaces of the first part are respectively provided with mounting grooves, and the graphite heat conductor is embedded in the mounting grooves.

[0010] In one embodiment of the present invention, the furnace wall body includes a refractory brick layer and a furnace shell arranged sequentially from the inside to the outside, and the first part extends at least partially into the refractory brick layer.

[0011] In one embodiment of the present invention, there are multiple heat-conducting components, which are arranged sequentially at intervals along the height direction of the furnace wall body.

[0012] In one embodiment of the present invention, the cooling channels of each of the heat-conducting components are connected in series; or, the cooling channels of each of the heat-conducting components are connected in parallel.

[0013] This utility model also provides a metallurgical furnace, including the furnace wall structure as described in any of the preceding claims.

[0014] This utility model also provides an electric furnace for DRI melting and separation, including the furnace wall structure as described in any of the preceding claims.

[0015] The beneficial effects of this invention are as follows: The furnace wall structure, metallurgical furnace, and electric furnace for DRI melting and separation proposed in this invention, by setting up a heat-conducting component, has a first part located between the inner and outer surfaces of the furnace wall body, and a second part located on the outer side of the outer surface of the furnace wall. Heat inside the furnace wall body can be conducted through the first part to the second part to cool the furnace wall body, thereby reducing the erosion of the refractory material by the high-temperature molten metal inside the metallurgical furnace. Simultaneously, this invention places the cooling channel for the cooling medium within the second part of the heat-conducting component, and exposes the second part of the heat-conducting component outside the outer surface of the furnace wall. In the event of accidental leakage in the cooling channel, the leakage point is located on the outer side of the furnace wall, which helps prevent leaked coolant from entering the furnace body, improving the safety of the metallurgical furnace. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the furnace wall structure provided in an embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional structural diagram of a heat-conducting component provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the mounting groove in a heat-conducting component provided in an embodiment of the present invention.

[0021] The attached diagram is labeled as follows: 1. Melt, 2. Refractory brick layer, 4. Furnace shell, 5. Heat-conducting component, 6. First part, 7. Second part, 8. Cooling channel, 9. Graphite heat conductor, 10. Mounting groove, 11. Liquid inlet, 12. Liquid outlet. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0025] Please see Figures 1-3 This utility model provides a furnace wall structure, including a furnace wall body, on which a heat-conducting component 5 is disposed. A first portion 6 of the heat-conducting component 5 extends between the inner and outer surfaces of the furnace wall body, and a second portion 7 of the heat-conducting component 5 is located on the outer side of the outer surface of the furnace wall. A cooling channel 8 for the flow of a cooling medium is disposed within the second portion 7. In this embodiment, the cooling medium is cooling water, which has advantages such as low cost and easy availability.

[0026] In this embodiment, the heat inside the furnace wall body can be conducted to the second part 7 via the first part 6, and carried away by the cooling medium in the second part 7 to cool the furnace wall body. This effectively reduces the temperature of the hot surface of the furnace wall, which is beneficial for forming a slag-coated protective layer on the hot surface of the furnace wall. This further reduces the erosion and corrosion of refractory materials such as heat-resistant brick layers in the furnace wall by the high-temperature melt 1 inside the metallurgical furnace. It has advantages such as safe use, good cooling effect, and long service life of the furnace wall. At the same time, when the cooling channel 8 accidentally leaks water, the leak point is located on the outside of the furnace wall, which helps to prevent the leaked coolant from entering the furnace body and improves the safety of the metallurgical furnace.

[0027] In this embodiment, the heat-conducting component 5 is made of copper. Copper has good thermal conductivity, which is beneficial for transferring heat from the furnace wall body to the outside of the furnace wall. In this embodiment, an installation opening for installing the heat-conducting component 5 is provided on the outer surface of the furnace wall body. The heat-conducting component 5 is installed in the furnace wall through the installation opening. In this embodiment, the installation opening is reserved during the construction of the furnace wall body, and the heat-conducting component 5 is installed through the installation opening, which facilitates installation and subsequent maintenance.

[0028] In this embodiment, there are multiple graphite heat conductors 9 on the heat-conducting component 5. In some embodiments, the graphite heat conductors 9 can be aligned to reduce processing difficulty. In this embodiment, the graphite heat conductors 9 can be staggered. The projection of the graphite heat conductor 9 in the thickness direction of the furnace wall body is a shielding projection. The edges of adjacent shielding projections that are close to each other at least partially overlap. In the thickness direction of the furnace wall, the overlapping of each shielding projection forms a complete shielding area. That is, each graphite heat conductor 9 forms a complete blocking structure in the thickness direction of the furnace wall. The blocking structure has no gaps in the thickness direction of the furnace wall. When the melt 1 inside the furnace wall is accidentally leaked, the complete blocking structure formed by each graphite heat conductor 9 can effectively block the leaked melt 1 in the thickness direction of the furnace wall, effectively preventing liquid slag or molten metal from seeping from the upper and lower surfaces of the copper plate.

[0029] In this embodiment, the heat-conducting component 5 is plate-shaped, and a mounting groove 10 is provided on the first part 6 of the heat-conducting component 5, in which the graphite heat conductor 9 is embedded. In this embodiment, mounting grooves 10 are respectively provided on the upper and lower surfaces of the first part 6, so that the thermal conductivity between the upper and lower surfaces of the heat-conducting component 5 is the same or similar, which is beneficial to reducing the thermal deformation of the heat-conducting component 5. In this embodiment, the heat-conducting component 5 is a copper plate, and the mounting groove 10 can be obtained by milling or other machining methods on the rolled copper plate, or it can be formed by machining after the copper plate is cast.

[0030] In this embodiment, the graphite heat conductor 9 is elongated. The length of the graphite heat conductor 9 is arranged along the circumference of the furnace body, and each graphite heat conductor 9 is stacked sequentially along the thickness direction of the furnace wall. Arranging the graphite heat conductor 9 along the circumference of the furnace body increases the number of layers of graphite heat conductor 9 in the thickness direction of the furnace wall. The graphite heat conductor 9 has good high-temperature resistance, and the increased number of graphite heat conductors 9 in the thickness direction of the furnace wall helps prevent accidental leakage of molten metal 1 from the heat-conducting component 5.

[0031] In this embodiment, the furnace wall body includes a refractory brick layer 2 and a furnace shell 4 arranged sequentially from the inside out. The furnace shell 4 is typically made of steel and mainly serves a protective function. The refractory brick layer 2 mainly plays a key role in high temperature resistance, heat insulation, and corrosion prevention. The hot surface of the refractory brick layer 2 in contact with the molten material 1 is made of refractory bricks with good high temperature resistance, erosion resistance, scour resistance, and high thermal conductivity. The first part 6 of the heat-conducting component 5 extends into the refractory brick layer 2, which can directly absorb and conduct heat from the refractory brick layer 2 to cool the refractory brick layer 2.

[0032] In one embodiment of this utility model, there are multiple heat-conducting components 5, which are arranged sequentially and at intervals along the height direction of the furnace wall body. This ensures heat conduction while maintaining the structural strength of the furnace wall. In this embodiment, the heat-conducting components 5 are evenly spaced along the height direction of the furnace wall body to improve the uniformity of heat dissipation from the furnace wall body, which is beneficial for uniform cooling of the furnace wall.

[0033] In this embodiment, each of the heat-conducting components 5 is evenly distributed around the circumference of the metallurgical furnace. Two adjacent heat-conducting components 5 in the circumferential direction are staggered in the height direction of the furnace wall body, which helps to maintain the structural strength of the furnace wall and promotes the uniformity of cooling of the furnace wall body.

[0034] In this embodiment, the cooling channel 8 is provided with an inlet 11 and an outlet 12 at both ends. The inlet 11 is connected to the inlet pipe, and the outlet 12 is connected to the outlet pipe to allow coolant to flow and carry away the heat transferred from the furnace wall body. In some embodiments, the cooling channels 8 of each heat-conducting component 5 are connected in series to simplify the pipeline structure and reduce equipment costs. In other embodiments, the cooling channels 8 of each heat-conducting component 5 are connected in parallel, which is beneficial to improving cooling efficiency and the uniformity of furnace wall cooling.

[0035] This embodiment also provides a metallurgical furnace, such as an electric furnace, including the furnace wall structure as described above.

[0036] This embodiment also provides an electric furnace for DRI (Direct Reduced Iron) melting treatment, including the furnace wall structure as described in any of the above embodiments, wherein the melting fraction and other components are melted in the electric furnace to form melt 1.

[0037] In summary, the furnace wall structure, metallurgical furnace, and electric furnace for DRI melting and separation provided by this utility model, through the provision of a heat-conducting component 5, wherein the first part 6 of the heat-conducting component 5 is located between the inner and outer surfaces of the furnace wall body, and the second part 7 of the heat-conducting component 5 is located on the outer side of the outer surface of the furnace wall, allows heat inside the furnace wall body to be conducted through the first part 6 to the second part 7 to cool the furnace wall body, thereby reducing the erosion of the refractory material by the high-temperature melt 1 inside the metallurgical furnace. Simultaneously, this utility model places the cooling channel 8 for the flow of cooling medium within the second part 7 of the heat-conducting component 5, and exposes the second part 7 of the heat-conducting component 5 on the outer surface of the furnace wall. When the cooling channel 8 accidentally leaks, the leak point is located on the outer side of the furnace wall, which helps to prevent leaked coolant from entering the furnace body and improves the safety of the metallurgical furnace.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A furnace wall structure, characterized in that, The furnace wall body includes a heat-conducting component. A first part of the heat-conducting component extends between the inner and outer surfaces of the furnace wall body, and a second part of the heat-conducting component is located on the outer side of the outer surface of the furnace wall. A cooling channel for the flow of cooling medium is provided in the second part.

2. The furnace wall structure according to claim 1, characterized in that: The first part is provided with a graphite heat conductor.

3. The furnace wall structure according to claim 2, characterized in that: The graphite heat conductors on the heat-conducting component are multiple, and the projection of the graphite heat conductors in the thickness direction of the furnace wall body is a shielding projection, and the edges of adjacent shielding projections that are close to each other at least partially overlap.

4. The furnace wall structure according to claim 3, characterized in that: The outer surface of the furnace wall body is provided with an installation opening for installing the heat-conducting component.

5. The furnace wall structure according to claim 2, characterized in that: The heat-conducting component is plate-shaped, and mounting grooves are respectively provided on the upper and lower surfaces of the first part, and the graphite heat conductor is embedded in the mounting grooves.

6. The furnace wall structure according to claim 1, characterized in that: The furnace wall body includes a refractory brick layer and a furnace shell arranged sequentially from the inside to the outside, with the first part extending at least partially into the refractory brick layer.

7. The furnace wall structure according to claim 1, characterized in that: The heat-conducting components are multiple, and the multiple heat-conducting components are arranged sequentially at intervals along the height direction of the furnace wall body.

8. The furnace wall structure according to claim 7, characterized in that: The cooling channels of each of the heat-conducting components are connected in series; or the cooling channels of each of the heat-conducting components are connected in parallel.

9. A metallurgical furnace, characterized in that: Includes the furnace wall structure as described in any one of claims 1 to 8.

10. An electric furnace for DRI melting and separation, characterized in that: Includes the furnace wall structure as described in any one of claims 1 to 8.

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