Self-embedded anti-cold air device for scrap steel preheating electric furnace

Abstract

This invention belongs to the technical field of scrap steel preheating electric arc furnace steelmaking equipment, and relates to a self-embedded anti-cold air device for a scrap steel preheating electric arc furnace. This self-embedded anti-cold air device is used to movably and sealably connect the upper furnace shell flue and the horizontal flue in the scrap steel preheating electric arc furnace. It includes a toothed furnace body bracket and a U-shaped flue bracket. The toothed furnace body bracket is fixedly installed on the upper furnace shell flue and moves with the scrap steel preheating electric arc furnace. The U-shaped flue bracket is fixedly installed on the side of the horizontal flue near the upper furnace shell flue, and the toothed end of the toothed furnace body bracket can freely embed into the U-shaped flue bracket in its direction of movement, forming an interlocking structure. During the furnace tilting process, the toothed furnace body bracket moves with the furnace body. During the smelting process, the toothed furnace body bracket and the U-shaped flue bracket interlock, filling the gap at the connection, improving the system's sealing performance, reducing cold air mixing, and thus improving the scrap steel preheating effect.

Description

Technical Field

[0001] This invention belongs to the technical field of scrap steel preheating electric furnace steelmaking equipment, and relates to a self-embedded anti-cold air device for a scrap steel preheating electric furnace. Background Technology

[0002] Since the advent of the Consteel electric arc furnace, an increasing number of users have chosen scrap preheating technology to improve energy efficiency. This technology utilizes the high-temperature flame generated during the electric arc furnace's smelting process to preheat the scrap steel before it enters the molten pool. The preheating process takes place at the front of the furnace, within a horizontal flue. During operation, a fan on one side of the horizontal flue creates negative pressure, drawing the high-temperature flame generated in the furnace on the other side into the flue. As the flame passes through the flue, it heats the scrap steel within. The preheated scrap steel reaches temperatures of several hundred degrees Celsius before being added to the molten pool, significantly shortening smelting time. Compared to adding cold steel directly, this improves smelting efficiency while achieving energy savings.

[0003] Ideally, the flue is sealed around the perimeter, creating a slight negative pressure. The flame enters from the end closest to the furnace body and heats the scrap steel as it passes through the flue. In this state, the preheating effect is unaffected by external cold air, and the drawn-in flame effectively heats the scrap steel within the flue.

[0004] In actual production, gaps are unavoidable at the joints around the flue. The more gaps there are, the greater the reduction in preheating effect. One such gap is at the inlet of the high-temperature flame, between the flue end face and the furnace body interface. This is because the furnace body tilts with a large range of motion, making a rigid connection between the furnace body and the enclosure impossible to achieve a seal. Current technology typically uses a flange-face connection structure to connect the flue end face and the furnace body interface, with a flange at each end face. While this structure is simple, in practice, it is difficult to achieve the required sealing effect. A large amount of cold air flows into the horizontal preheating section through this gap, affecting the preheating effect. At the same time, this gap easily causes slag splashing from inside the furnace to spill out. The accumulation of large amounts of slag not only increases the labor intensity of operators but also easily damages electrical equipment in this area, increasing equipment maintenance costs. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a self-embedded anti-cold air device for a scrap steel preheating electric furnace, which improves the preheating sealing to reduce the entry of external cold air into the preheating system, thereby improving the preheating effect of scrap steel.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A self-embedded anti-cold air device for a scrap steel preheating electric furnace is disclosed. This self-embedded anti-cold air device is used to movably and sealably connect the upper furnace shell flue and the horizontal flue in the scrap steel preheating electric furnace. It includes a toothed furnace body bracket and a flue U-shaped bracket. The toothed furnace body bracket is fixedly installed on the upper furnace shell flue and moves with the scrap steel preheating electric furnace. The flue U-shaped bracket is fixedly installed on the side of the horizontal flue near the upper furnace shell flue. The toothed end of the toothed furnace body bracket can freely embed into the flue U-shaped bracket in its direction of movement to form an interlocking structure.

[0008] Furthermore, there are two toothed furnace body hangers, which are respectively arranged on both sides of the upper furnace shell flue along the tilting direction of the scrap steel preheating electric furnace.

[0009] Furthermore, the flue U-shaped bracket includes a flue bottom bracket and two toothed flue brackets connected to the flue bottom bracket. The toothed flue brackets are fixedly connected to both sides of the horizontal flue along the tilting direction of the scrap steel preheating electric furnace, so as to freely engage with the toothed furnace body bracket in the tilting direction of the scrap steel preheating electric furnace.

[0010] The bottom bracket of the flue is fixedly connected to the bottom of the horizontal flue near the upper furnace shell flue, and is used to fill the gap formed at the bottom between the upper furnace shell flue and the horizontal flue after the toothed furnace body bracket and the toothed flue bracket are installed.

[0011] Furthermore, it also includes a flue top hanger, which is fixed to the top of the horizontal flue near the upper furnace shell flue, and is used to fill the gap formed at the top between the upper furnace shell flue and the horizontal flue after the toothed furnace body hanger and the flue U-shaped hanger are installed.

[0012] The beneficial effects of this invention are as follows:

[0013] The present invention provides a self-embedded anti-cold air device for a scrap steel preheating electric furnace. The toothed furnace body hanger and the flue U-shaped hanger are self-embedded. During the tilting of the furnace body, the toothed furnace body hanger moves with the furnace body. During the smelting process, the toothed furnace body hanger and the flue U-shaped hanger interlock, filling the gap at the connection, improving the system's sealing performance, and reducing the mixing of cold air.

[0014] Secondly, this self-embedded anti-cold air device is composed of purely mechanical parts, making it simple and compact. It can function without power assistance, has a relatively simple structure, and low operating costs. It is also highly versatile and easy to install and maintain. This self-embedded anti-cold air device can be widely used in electric arc furnace steelmaking equipment that adopts scrap steel preheating technology, and has broad application prospects. At the same time, it also has the advantage of easy installation for retrofitting existing equipment.

[0015] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1 A schematic diagram of the elevation layout of a self-embedded anti-cold air device for a scrap steel preheating electric furnace;

[0018] Figure 2 This is a schematic diagram of the state of a self-embedded anti-cold air device in a scrap steel preheating electric furnace (when the furnace body tilts towards the steel tapping side);

[0019] Figure 3 This is a schematic diagram of the state of a self-embedded anti-cold air device in a scrap steel preheating electric furnace (when the furnace body tilts towards the slag discharge side);

[0020] Figure 4 This is a schematic diagram of the structure of a self-embedded anti-cold air device for a scrap steel preheating electric furnace.

[0021] Attached reference numerals: 1-Upper furnace shell flue, 2-Top flue hanging piece, 3-Horizontal flue, 4-Toothed furnace body hanging piece, 5-U-shaped flue hanging piece, 51-Bottom flue hanging piece, 52-Toothed flue hanging piece, 6-Upper furnace shell. Detailed Implementation

[0022] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Please see Figures 1-4 This is a self-embedded anti-cold air device for a scrap steel preheating electric furnace, applied in electric furnace steelmaking equipment equipped with scrap steel preheating technology. The self-embedded anti-cold air device is used to reduce the distance between the connection between the upper furnace shell 6 (furnace body) and the horizontal flue 3 of the scrap steel preheating electric furnace. It is installed between the upper furnace shell flue 1 and the horizontal flue 3 in the upper furnace shell 6 to achieve a sealed connection between the upper furnace shell flue 1 and the horizontal flue 3. The upper furnace shell flue 1 is connected to the furnace body of the scrap steel preheating electric furnace through the upper furnace shell 6, so as to draw the high-temperature flame generated in the furnace body into the upper furnace shell flue 1 and the horizontal flue 3 for preheating the scrap steel.

[0026] The scrap steel preheating electric furnace includes a toothed furnace body hanger 4, a flue top hanger 2, and a flue U-shaped hanger 5. The toothed furnace body hanger 4 is fixedly installed on the upper furnace shell flue 1 to follow the tilting of the scrap steel preheating electric furnace. The flue U-shaped hanger 5 is fixedly installed at the inlet of the horizontal flue 3 (on the side near the upper furnace shell flue 1). The toothed ends of the toothed furnace body hanger 4 can freely embed into the flue U-shaped hanger 5 in the direction of movement to form a meshing structure, thereby reducing the gap between the upper furnace shell flue 1 and the horizontal flue 3 at their connection, improving sealing, and reducing the mixing of cold air.

[0027] The top hanging piece 2 of the flue is fixed to the upper part of the horizontal flue 3 near the upper furnace shell flue 1. It is used to fill the gap formed at the top between the upper furnace shell flue 1 and the horizontal flue 3 after the toothed furnace body hanging piece 4 and the flue U-shaped hanging piece 5 are installed, and to further improve the sealing of the connection.

[0028] Specifically, the flue U-shaped hanger 5 includes a flue bottom hanger 51 and a toothed flue hanger 52 connected to the flue bottom hanger 51. The whole is U-shaped. The toothed flue hanger 52 is fixedly connected to both sides of the horizontal flue 3 along the tilting direction of the scrap steel preheating electric furnace, so as to freely fit with the toothed furnace body hanger 4 fixedly installed on both sides of the upper furnace shell flue 1.

[0029] The bottom mounting bracket 51 of the flue is used to fill the gap formed at the bottom between the upper furnace shell flue 1 and the horizontal flue 3 after the toothed furnace body mounting bracket 4 and the toothed flue mounting bracket 52 are installed, further improving the sealing of the connection.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention 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 the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A self-embedded anti-cold air device for a scrap steel preheating electric furnace, the self-embedded anti-cold air device being used for a movable and sealed connection between the upper furnace shell flue and the horizontal flue in the scrap steel preheating electric furnace, characterized in that: It includes a toothed furnace body hanger and a U-shaped flue hanger. The toothed furnace body hanger is fixedly installed on the upper furnace shell flue and tilts with the scrap steel preheating electric furnace. The U-shaped flue hanger is fixedly installed on the side of the horizontal flue near the upper furnace shell flue. The toothed end of the toothed furnace body hanger can be freely embedded in the U-shaped flue hanger in its direction of movement to form an interlocking structure. The toothed furnace body hangers are two in number and are respectively arranged on both sides of the upper furnace shell flue along the tilting direction of the scrap steel preheating electric furnace; The flue U-shaped hanger includes a flue bottom hanger and two toothed flue hangers connected to the flue bottom hanger. The toothed flue hangers are fixedly connected to both sides of the horizontal flue along the tilting direction of the scrap steel preheating electric furnace, so as to freely fit with the toothed furnace body hanger in the tilting direction of the scrap steel preheating electric furnace. The bottom bracket of the flue is fixedly connected to the bottom of the horizontal flue near the upper furnace shell flue, and is used to fill the gap formed at the bottom between the upper furnace shell flue and the horizontal flue after the toothed furnace body bracket and the toothed flue bracket are installed. It also includes a flue top hanger, which is fixed to the top of the horizontal flue near the upper furnace shell flue, and is used to fill the gap formed at the top between the upper furnace shell flue and the horizontal flue after the toothed furnace body hanger and the flue U-shaped hanger are installed.

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