Four-hole flue transition pipe of electric arc furnace

Abstract

The utility model relates to the field of electric arc furnace smoke passing pipelines, and discloses an electric arc furnace four-hole flue transition pipe which is installed between an electric arc furnace cover and a four-hole flue, is formed by bending a cold water pipe and is provided with an outer ring part, an inner ring part and a bottom ring part which are communicated in sequence. The electric arc furnace four-hole flue transition pipe is provided with two layers, the top layer is an outer ring part and an inner ring part which are sleeved with each other, the bottom layer is a bottom ring part, and the bottom ring part and the inner ring part are the same in size and shape and are located under the inner ring part. A water inlet end is arranged on the outer ring part, a water outlet end is arranged on the bottom ring part, and the water outlet end extends to the top layer through the turn-back part and is adjacent to the water inlet end; according to the utility model, the production time is short, and the replacement period and the maintenance time can be effectively shortened; the four-hole flue transition pipe of the electric arc furnace is low in spare part cost, and cost waste caused by flue replacement is reduced.

Description

Technical Field

[0001] The utility model relates to the field of smoke exhaust pipes of electric arc furnaces, and more specifically, to a four-hole flue transition pipe for an electric arc furnace. Background Art

[0002] With the continuous development of the steelmaking technology of electric arc furnaces, while focusing on the research and development of efficient, low-consumption and intelligent smelting technologies, green environmental protection has also become an important control technology for electric furnace steelmaking. Especially with the continuous upgrading of the hot metal charging technology for electric furnaces, in order to reasonably control the smelting cycle, the oxygen supply intensity during the smelting process has been continuously increased, and the smoke and dust generated by the carbon-oxygen reaction during the smelting process have increased sharply. The situation of smoke and dust overflow has intensified, and the top dust removal cannot meet the smoke and dust collection requirements. In order to achieve the green development of electric furnace steelmaking, four-hole dust removal on the furnace cover is added, and through the suction force of a high-power fan, the smoke and dust during the smelting process are centrally collected.

[0003] During the collection of smoke and dust, the scouring of high-temperature and high-speed smoke and dust causes oxidation erosion of the material of the water-cooled parts at the lower part of the four-hole flue and relatively low fatigue strength. During use, damage, cracking and water leakage are likely to occur, posing a great potential safety hazard. The four-hole flue is large in volume, high in spare part cost, and long in replacement cycle, seriously affecting the continuity, stability and cost control of production, and imposing great restrictions on the production of electric arc furnaces. Summary of the Utility Model

[0004] The utility model aims to overcome at least one defect of the above-mentioned prior art, and provides a four-hole flue transition pipe for an electric arc furnace, which is used to solve the technical problems that the material of the water-cooled parts at the lower part of the four-hole flue is oxidized and eroded and the fatigue strength is relatively low, the four-hole flue is large in volume, high in spare part cost, long in replacement cycle, seriously affecting the continuity, stability and cost control of production, and imposing great restrictions on the production of electric arc furnaces.

[0005] The technical solution adopted by the utility model is that a four-hole flue transition pipe for an electric arc furnace is installed between the furnace cover of the electric arc furnace and the four-hole flue, and is formed by bending a cold water pipe, and has an outer ring part, an inner ring part and a bottom ring part which are connected in sequence; the four-hole flue transition pipe for the electric arc furnace has two layers, the top layer is the outer ring part and the inner ring part which are sleeved, the bottom layer is the bottom ring part, the size and shape of the bottom ring part are the same as those of the inner ring part, and the bottom ring part is directly below the inner ring part; a water inlet end is arranged on the outer ring part, and a water outlet end is arranged on the bottom ring part.

[0006] This solution is installed between the furnace cover of the electric arc furnace and the four-hole flue, optimizing the installation mode of the four-hole flue. At the same time, the water inlet end and the water outlet end can be connected to an external cold water circulation system, which can play a role in cooling, protect the four-hole flue, reduce the erosion of high-temperature soot on the four-hole flue, and improve the service life of the flue. The transition pipe of the four-hole flue of this electric arc furnace is simple to manufacture. It can be produced by bending the pipe with a bending machine, and the production time is short, which can effectively shorten the replacement cycle and maintenance time. The transition pipe of the four-hole flue of this electric arc furnace uses fewer pipelines, and the spare part cost is relatively low, reducing the cost waste caused by replacing the flue. It can be made of high-pressure boiler steel, meeting the performance requirements such as high-temperature oxidation resistance, soot erosion resistance, and fatigue strength, and can effectively improve the service life.

[0007] Further, the cold water pipe starts from the water inlet end and winds forward in a circle to form an outer ring part opposite to the initial position. Then it bends inward and winds backward in a circle to form an inner ring part. Then it bends downward and winds forward in a circle at the lower layer to form a bottom ring part. There are gaps formed at the relative positions of the initial position and the end position of the outer ring part, the initial position and the end position of the inner ring part, and the initial position and the end position of the bottom ring part. The whole transition pipe of the four-hole flue of the electric arc furnace is formed by bending a cold water pipe. During production and manufacturing, it can be produced by a bending machine, with low production and manufacturing difficulty and strong integrity.

[0008] Further, the gaps on the outer ring part, the inner ring part, and the bottom ring part are in the same vertical plane. In this way, each layer is a circle. Compared with the spiral winding form, it is more convenient to determine the position of the leak. At the same time, the existence of the gaps can cause a slight change in the diameter of the transition pipe of the four-hole flue of the electric arc furnace, facilitating minor adjustments and effectively reducing the installation difficulty.

[0009] Further, the water outlet end extends to the top layer through a folding part and is arranged adjacent to the water inlet end. The part that extends outward from the end position of the bottom ring part, passing through the gap of the bottom ring part, the gap of the inner ring part, and the gap of the outer ring part in sequence, is the folding part. The folding part just blocks the gaps. At the same time, with this setting, it is equivalent to not changing the wall thickness of the transition pipe of the four-hole flue of the electric arc furnace, without affecting its aesthetics and integrity.

[0010] Further, the outer ring part and the inner ring part are fixedly connected through a connecting piece one, and the cross-section of the connecting piece one is rectangular. The rectangular connecting piece one can effectively improve the connection strength between the inner ring part and the outer ring part, thereby effectively improving the overall structural strength of the transition pipe of the four-hole flue of the electric arc furnace, with strong bearing capacity and high reliability.

[0011] Further, the turning-back part is fixedly connected to the end position of the outer ring part and the initial position of the inner ring part through the second connecting piece. The second connecting piece is mainly used to increase the connection strength between the end position of the outer ring part and the initial position of the turning-back part, and between the initial position of the inner ring part and the turning-back part, so as to effectively improve the structural strength of the four-hole transition pipe of the electric arc furnace, and at the same time reduce the heat exchange between the end position of the outer ring part and the turning-back part, and between the initial position of the inner ring part and the turning-back part, thereby effectively improving the cooling performance of the four-hole flue transition pipe of the electric arc furnace.

[0012] Further, it also includes an open clamp and a closed clamp, and the open clamp and the closed clamp are oppositely arranged on the four-hole flue transition pipe of the electric arc furnace. The open clamp can quickly position one side of the four-hole flue transition pipe of the electric arc furnace, and the closed clamp can firmly fix the other side of the four-hole flue transition pipe of the electric arc furnace, so that the four-hole flue transition pipe of the electric arc furnace is firmly installed on the end cover of the electric arc furnace.

[0013] Further, the outer ring part, the inner ring part, the bottom ring part and the turning-back part are integrally formed, and all are made of 12Cr1MoV steel. 12Cr1MoV steel has higher oxidation resistance and heat resistance, which can significantly improve its service life.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: This solution is installed between the furnace cover of the electric arc furnace and the four-hole flue, optimizing the installation mode of the four-hole flue. At the same time, the water inlet end and the water outlet end can be connected to an external cold water circulation system, which can play a role in cooling, protect the four-hole flue, reduce the erosion of high-temperature soot on the four-hole flue, and improve the service life of the flue; This four-hole flue transition pipe of the electric arc furnace is simple to manufacture, and can be produced by bending pipes with a bending machine, with a short production time, which can effectively shorten the replacement cycle and maintenance time; This four-hole flue transition pipe of the electric arc furnace uses fewer pipelines, has a lower spare part cost, and reduces the cost waste caused by replacing the flue; It can be made of high-pressure boiler steel, meeting the performance requirements such as high-temperature oxidation resistance, soot erosion resistance, and fatigue strength, and can effectively improve the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0016] Figure 2 It is a cross-sectional view of the present utility model.

[0017] Figure 3 For the present utility model Figure 1 View in the direction of A-A.

[0018] In the figure: 1. Outer ring part; 2. Inner ring part; 3. Bottom ring part; 4. Water inlet end; 5. Water outlet end; 6. Open clamp; 7. Closed clamp; 8. Turning-back part; 9. First connecting piece; 10. Second connecting piece. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The attached drawings of the utility model are only for illustrative purposes and should not be construed as a limitation to the utility model. For better illustration of the following embodiments, some components in the drawings may be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0020] As Figure 1 shown, this solution discloses a four-hole flue transition pipe for an electric arc furnace, which is connected to the four-hole flue at the upper part, connected to the furnace cover at the lower part, has an inner diameter consistent with that of the four-hole flue, an outer diameter consistent with the skirt plate at the bottom of the four-hole flue, the bottom water-cooling pipeline is slightly smaller than the inner diameter of the opening on the furnace cover, with buckles provided on both sides and connected to the furnace cover through pins, and an extended water-cooling interface is provided on one side and water-cooled connected to the furnace cover through a flange. The material of the four-hole flue transition pipe for the electric arc furnace uses high-pressure boiler steel, is formed by the detour of the water-cooling pipe, and the cross-section tends to be elliptical.

[0021] Buckles are respectively fixed on both sides. One side of the buckle is an open-type open clip 6, and the buckle on the other side is a closed-type closed clip 7. Through the open clip 6, one side of the four-hole flue transition pipe of the electric arc furnace can be quickly fixed on the electric arc furnace, and through the closed clip 7 on the other side, the four-hole flue transition pipe of the electric arc furnace can be firmly installed on the furnace cover.

[0022] The four-hole flue transition pipe of the electric arc furnace has two layers. The top layer has an outer ring part 1 and an inner ring part 2 that are sleeved. The bottom layer is set as a bottom ring part 3. The bottom ring part 3 has the same size and shape as the inner ring part 2 and is located directly below the inner ring part 2;

[0023] The cold water pipe has a water inlet end 4 and a water outlet end 5. The cold water pipe starts from the water inlet end 4 and makes a forward detour for one circle to form an outer ring part 1 relative to the initial position. A gap is formed between the initial position and the end position of the outer ring part 1. Then it continues to make a reverse detour for one circle inside the outer ring part 1 to form an inner ring part 2. A gap is formed at the relative position of the initial position and the end position of the inner ring part 2. Then it turns to the lower layer and makes a forward detour for one circle in the lower layer to form a bottom ring part 3. A gap is also formed at the relative position of the initial position and the end position of the bottom ring part 3. Then it passes through the gap of the bottom ring part 3, the gap of the inner ring part 2, and the gap of the outer ring part 1 in sequence to form a return part 8. Finally, it extends outward to its water outlet end 5, and the detour ends. The water outlet end 5 extends to the top layer through the return part 8 and is arranged adjacent to the water inlet end 4. The gaps on the outer ring part 1, the inner ring part 2, and the bottom ring part 3 are in the same vertical plane.

[0024] After installation, the flue gas moves from the lower layer to the upper layer. Therefore, the temperature gradually increases from the outer ring part 1 to the inner ring part 2 on the top layer, and the temperature gradually increases from the top layer to the lower layer. After being installed on the end cover of the electric arc furnace, the higher-temperature flue gas can first be cooled by the relatively higher-temperature bottom ring part 3 on the lower layer, and then be cooled by the relatively lower-temperature inner ring part 2 on the top layer. The design is more reasonable.

[0025] The water outlet end 5 and the water inlet end 4 of the cold water pipe extend outward through pipelines to facilitate connection to an external cold water circulation system. The water inlet end 4 and the water outlet end 5 of the cold water pipe are adjacent, facilitating the connection of pipelines to the external cold water circulation system.

[0026] The outer ring part 1 and the inner ring part 2 are connected by a first connecting piece 9. The first connecting piece 9 can improve the connection strength between the outer ring part 1 and the inner ring part 2, and the cross-section of the first connecting piece 9 is rectangular.

[0027] The folding part 8 is connected to the tail of the outer ring part 1, the initial position of the inner ring part 2, and the tail of the bottom ring part 3 by a second connecting piece 10. The second connecting piece 10 can improve the connection strength between the folding part 8 and the tail of the outer ring part 1, the initial position of the inner ring part 2, and the tail of the bottom ring part 3. The bottom ring part 3 and the inner ring part 2 can be welded together. The second connecting piece 10 can improve the connection strength between the folding part 8 and the tail of the outer ring part 1, the initial position of the inner ring part 2, and the tail of the bottom ring part 3. The bottom ring part 3 and the inner ring part 2 can be welded together.

[0028] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An arc furnace four-hole flue transition pipe is installed between the arc furnace lid and the four-hole flue, and is characterized in that: It is formed by bending a cold water pipe and has an outer ring part (1), an inner ring part (2), and a bottom ring part (3) that are connected in sequence. The four-hole flue transition pipe of the electric arc furnace has two layers. The top layer is the outer ring part (1) and the inner ring part (2) that are nested, and the bottom layer is the bottom ring part (3). The bottom ring part (3) has the same size and shape as the inner ring part (2) and is located directly below the inner ring part (2). An inlet end (4) is provided on the outer ring part (1), and an outlet end (5) is provided on the bottom ring part (3).

2. The transition pipe for the four-hole flue of an electric arc furnace according to claim 1, characterized in that: The cold water pipe starts from the inlet end (4) and winds forward in a circle to form the outer ring part (1) relative to the initial position. Then it bends inward and winds backward in a circle to form the inner ring part (2). Then it bends downward and winds forward in a circle in the lower layer to form the bottom ring part (3). Gaps are formed at the relative positions of the initial and end positions of the outer ring part (1), the inner ring part (2), and the bottom ring part (3).

3. The four-hole flue transition pipe of an electric arc furnace according to claim 2, characterized in that: The gaps on the outer ring part (1), the inner ring part (2), and the bottom ring part (3) are in the same vertical plane.

4. The transition pipe for the four-hole flue of an electric arc furnace according to claim 3, characterized in that: The outlet end (5) extends to the top layer through a folding part (8) and is arranged adjacent to the inlet end (4).

5. The transition pipe for the four-hole flue of an electric arc furnace according to claim 4, wherein: Starting from the end position of the bottom ring part (3), the part that extends outward in sequence through the gap of the bottom ring part (3), the gap of the inner ring part (2), and the gap of the outer ring part (1) is the folding part (8).

6. The transition pipe for the four-hole flue of an electric arc furnace according to claim 4, characterized in that: The materials used for the outer ring part (1), the inner ring part (2), the bottom ring part (3), and the folding part (8) are all 12Cr1MoV steel.

7. The transition pipe of the four-hole flue of an electric arc furnace according to claim 4, characterized in that: The folding part (8) is fixedly connected to the end position of the outer ring part (1) and the initial position of the inner ring part (2) through a second connecting piece (10).

8. The transition pipe for the four-hole flue of an electric arc furnace according to claim 1, characterized in that: The outer ring part (1) and the inner ring part (2) are fixedly connected through a first connecting piece (9), and the cross-section of the first connecting piece (9) is rectangular.

9. A four-hole flue transition pipe for an electric arc furnace according to any one of claims 1-8, characterized in that: It also includes an open clip (6) and a closed clip (7), and the open clip (6) and the closed clip (7) are arranged oppositely on the four-hole flue transition pipe of the electric arc furnace.

Images