arc furnace

Abstract

This utility model discloses an electric arc furnace, belonging to the technical field of steelmaking equipment. To address the problem of existing scrap preheating electric arc furnaces failing to solve the adhesion issue of spatter in the preheating section when the raw material is a large proportion of molten iron, the electric arc furnace includes a horizontal preheating section (2), a charging trolley (3), and a furnace body (4) arranged sequentially from left to right. The electric arc furnace also includes a movable flue (5) and a movable fume hood (6). When smelting a large proportion of molten iron, the movable flue is connected to the furnace body's feed inlet. The movable flue can block the spatter discharged from the feed inlet, preventing it from entering the horizontal preheating section. This allows it to be applied to both extreme raw material structures: all scrap steel and a large proportion of molten iron.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking equipment technology, specifically an electric arc furnace. Background Technology

[0002] Electric arc furnace (EAF) steelmaking is attracting increasing attention from steel companies. However, due to the influence of blast furnace technology, EAFs need to consume a portion of molten iron. In addition, with fluctuations in scrap steel prices, the raw material structure of EAFs may change from all scrap steel to a large proportion of molten iron of over 80%. Under all scrap steel conditions, existing scrap steel preheating EAFs can increase the average preheating temperature of scrap steel to over 250°C. However, under a large proportion of molten iron, due to the intense carbon-oxygen reaction, the splashes in the preheating section will adhere to the scrap steel, making it difficult for the scrap steel to enter the furnace body and affecting normal production. Utility Model Content

[0003] To address the problem of sputtering material adhering to the preheating section when the raw material is a large proportion of molten iron, existing scrap preheating electric furnaces fail to solve this issue. This invention provides an electric arc furnace in which, when smelting a large proportion of molten iron, the movable flue is connected to the furnace body's feed inlet. The movable flue can block the sputtering material discharged from the feed inlet, preventing it from entering the horizontal preheating section. This design allows for simultaneous application to both extreme raw material structures, such as all scrap steel and a large proportion of molten iron.

[0004] The technical solution adopted by this utility model embodiment to solve its technical problem is:

[0005] An electric arc furnace includes a horizontal preheating section, a feeding trolley, and a furnace body arranged sequentially from left to right. The electric arc furnace also includes a movable flue and a movable fume hood. The left side of the furnace body has a feeding port. When the movable fume hood is connected to the feeding port, the high-temperature flue gas discharged from the feeding port can enter the horizontal preheating section through the movable fume hood. When the movable flue is connected to the feeding port, the high-temperature flue gas discharged from the feeding port can enter the horizontal preheating section through the movable flue. The high-temperature flue gas discharged from the feeding port can change direction within the movable flue.

[0006] The movable flue has a split structure, consisting of horizontal flue sections and vertical flue sections arranged vertically. The horizontal flue sections extend in the left-right direction, and the vertical flue sections extend in the up-down direction. The horizontal flue sections can move left and right, and the vertical flue sections can move up and down.

[0007] When the active flue is connected to the feed inlet, the vertical flue section is at the upper limit position, the horizontal flue section is at the right limit position, the inlet end of the vertical flue section is connected to the feed inlet, the outlet end of the vertical flue section is connected to the inlet end of the horizontal flue section, the horizontal preheating section contains the first mixing air inlet, and the outlet end of the horizontal flue section is connected to the first mixing air inlet.

[0008] The vertical flue section includes an upper connecting pipe, a top wall, a side wall, and a bottom wall connected sequentially from top to bottom. The upper connecting pipe is in an upright state and has a first magnetic suction valve at its upper end. The inlet end of the vertical flue section is located on the side wall, and the area of ​​the inlet end of the vertical flue section is larger than the area of ​​the feed inlet. The vertical flue section includes a carbon steel layer and a fire-resistant refractory layer connected sequentially from the outside to the inside, and a water-cooled pipe is installed inside the fire-resistant refractory layer.

[0009] The movable flue also includes a first lifting mechanism and a translation mechanism connected vertically. The upper end of the first lifting mechanism is connected to the lower end of the vertical flue section. The first lifting mechanism can drive the vertical flue section to move up and down, and the translation mechanism can drive the vertical flue section and the first lifting mechanism to move forward, backward, left and right.

[0010] The movable flue also includes a second lifting mechanism and rollers connected vertically. The horizontal flue section includes an upright outlet section, a horizontal main body section, and an upright inlet section connected sequentially from left to right. The horizontal main body section extends in the left-right direction. The upper end of the second lifting mechanism is connected to the horizontal main body section. The second lifting mechanism can drive the rollers to move up and down. The rollers roll on the horizontal preheating section. The lower end of the upright inlet section is equipped with a second magnetic suction valve. When the outlet end of the vertical flue section is connected to the inlet end of the horizontal flue section, and the outlet end of the horizontal flue section is connected to the first mixing air port, the rollers can move upward and disengage from the horizontal preheating section.

[0011] The horizontal preheating section contains a first mixing port, a second mixing port, and a third mixing port arranged sequentially from right to left. The first mixing port is connected to a butterfly valve. When the movable fume hood is connected to the feed inlet, the outlet end of the movable flue is connected to the second mixing port.

[0012] The horizontal preheating section includes a first preheating section and a second preheating section arranged on the left and right. The second preheating section contains a cooling water pipe. The first mixing air inlet, the second mixing air inlet and the third mixing air inlet are all located on the first preheating section. An air extraction device is installed on the first preheating section. The horizontal preheating section is connected to a preheating section vibrator.

[0013] The electric arc furnace also includes a horizontal feeding section, which is connected to the horizontal preheating section. A scrap steel pressing device is installed between the horizontal feeding section and the horizontal preheating section. The scrap steel pressing device has a curtain-type structure. The horizontal feeding section is connected to the feeding section vibrator.

[0014] The feeding trolley consists of a feeding trough, a trolley vibrator, and a trolley body connected in sequence. The feeding trough, trolley vibrator, and trolley body can move left and right. The movable fume hood extends in the left and right direction and is fitted outside the feeding trough and the horizontal preheating section. The bottom of the movable fume hood is connected in sequence with bottom wheels and rails, and the movable fume hood can move left and right.

[0015] The beneficial effects of this utility model embodiment are: it solves the problem that the horizontal continuous feeding scrap preheating electric furnace cannot be used normally due to severe splashing under the condition of a large proportion of molten iron raw material structure. It can be applied to both extreme raw material structures of all scrap steel and large proportion of molten iron. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0017] Figure 1 This is a schematic diagram of the electric arc furnace described in this invention when the active flue and the feed inlet are connected in accordance with each other in Embodiment 1.

[0018] Figure 2 This is a schematic diagram of the electric arc furnace described in this invention when the active flue and the feed inlet are connected in accordance with each other in Embodiment 1.

[0019] Figure 3 This is a schematic diagram of the movable flue in Example 1.

[0020] Figure 4 It is along Figure 3 Cross-sectional view along the AA direction.

[0021] Figure 5 This is a schematic diagram of the first preheating section in Example 1.

[0022] Figure 6 This is a schematic diagram of the second preheating section in Example 1.

[0023] Figure 7 This is a schematic diagram of the movable flue extending in Example 1.

[0024] Figure 8 This is a schematic diagram of the active flue retracting in Example 1.

[0025] Figure 9 This is a schematic diagram of the movable flue in Example 2.

[0026] Figure 10 This is a schematic diagram of the movable flue extending in Example 2.

[0027] Figure 11 This is a schematic diagram of the active flue retracting in Example 2.

[0028] The annotations in the attached figures are explained as follows:

[0029] 1. Horizontal feeding section; 2. Horizontal preheating section; 3. Feeding trolley; 4. Furnace body; 5. Movable flue; 6. Movable fume hood;

[0030] 11. Scrap steel pressing device; 12. Vibrator for feeding section;

[0031] 21. First mixing air inlet; 22. Second mixing air inlet; 23. Third mixing air inlet; 24. First preheating section; 25. Second preheating section; 26. Preheating section vibrator;

[0032] 31. Feed chute; 32. Trolley vibrator; 33. Car body;

[0033] 41. Feed inlet; 42. Iron outlet;

[0034] 51. Horizontal flue section; 52. Vertical flue section; 53. First lifting mechanism; 54. Translation mechanism; 55. Second lifting mechanism; 56. Rollers;

[0035] 61. Bottom wheel; 62. Track;

[0036] 211. Butterfly valve;

[0037] 241. Air extraction device;

[0038] 251. Cooling water pipe;

[0039] 511. Vertical outlet section; 512. Horizontal main body section; 513. Vertical inlet section; 514. Second magnetic suction valve;

[0040] 521. Upper connecting pipe; 522. Top wall; 523. Side wall; 524. Bottom wall; 525. First magnetic valve; 526. Fireproof refractory layer; 527. Carbon steel layer; 528. Water cooling pipe. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 1 The direction above, the directional word "down" indicates Figure 1 The lower side of the middle, the directional word "left" indicates Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 1 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to the paper. Figure 1The direction of the orientation is towards the outside of the paper. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them based on actual needs or a limited number of experiments.

[0043] Example 1

[0044] like Figures 1 to 2 As shown in the figure, the electric arc furnace described in this embodiment includes a horizontal preheating section 2, a feeding trolley 3, and a furnace body 4 arranged sequentially from left to right. The electric arc furnace also includes a movable flue 5 and a movable fume hood 6. The left side of the furnace body 4 contains a feed inlet 41. The movable fume hood 6 or the movable flue 5 can be connected to the feed inlet 41. When the movable fume hood 6 is connected to the feed inlet 41, the high-temperature flue gas discharged from the feed inlet 41 can enter the horizontal preheating section 2 through the movable fume hood 6. When the movable flue 5 is connected to the feed inlet 41, the high-temperature flue gas discharged from the feed inlet 41 can enter the horizontal preheating section 2 through the movable flue 5. The high-temperature flue gas discharged from the feed inlet 41 can change direction within the movable flue 5.

[0045] When a large proportion of molten iron (more than 80% by weight in the raw materials) is added to the furnace body 4 and smelted, the movable flue 5 is connected to the feed inlet 41 and is in the working position. The charging trolley 3 and the movable fume hood 6 are both detached from the feed inlet 41 and are in the waiting position. When scrap steel is added to the furnace body 4 and smelted, the charging trolley 3 and the movable fume hood 6 are both connected to the feed inlet 41 and are in the working position. The movable flue 5 is detached from the feed inlet 41 and is in the waiting position. Under conditions of a large proportion of molten iron, the movable flue 5 can prevent splashes from the molten pool in the furnace body 4 from entering the horizontal preheating section 2 from the feed inlet 41, preventing the scrap steel from being overheated and sticking to the horizontal preheating section 2. This allows for simultaneous application to both extreme raw material structures of all scrap steel and a large proportion of molten iron.

[0046] As one possible implementation method, such as Figure 3 As shown, the movable flue 5 is a split structure, containing a horizontal flue section 51 and a vertical flue section 52 arranged vertically. Both the horizontal and vertical flue sections 51 and 52 are cylindrical. The main structure of the horizontal flue section 51 extends horizontally, while the main structure of the vertical flue section 52 extends vertically. The horizontal flue section 51 can move left and right, and the vertical flue section 52 can move up and down. The high-temperature flue gas discharged from the feed inlet 41 faces left. Within the movable flue 5, the high-temperature flue gas discharged from the feed inlet 41 first moves upward and then to the left. The movable flue 5 can prevent splashes from the molten pool in the furnace body 4 from entering the horizontal preheating section 2 from the feed inlet 41.

[0047] As one possible implementation method, such as Figure 1 and Figure 3 As shown, when the movable flue 5 is connected to the feed inlet 41, the vertical flue section 52 is at the upper limit position, the horizontal flue section 51 is at the right limit position, the inlet end of the vertical flue section 52 is connected to the feed inlet 41, the outlet end of the vertical flue section 52 is connected to the inlet end of the horizontal flue section 51, the horizontal preheating section 2 contains a first mixing air inlet 21, and the outlet end of the horizontal flue section 51 is connected to the first mixing air inlet 21.

[0048] As one possible implementation method, such as Figure 3 As shown, the vertical flue section 52 includes an upper connecting pipe 521, a top wall 522, a side wall 523, and a bottom wall 524 connected sequentially from top to bottom. The upper connecting pipe 521 is in an upright state, and a first magnetic suction valve 525 is provided at the upper end of the upper connecting pipe 521. The upper end of the upper connecting pipe 521 is the outlet end of the vertical flue section 52. The diameter of the upper connecting pipe 521 is smaller than the diameter of the side wall 523. The inlet end of the vertical flue section 52 is located on the side wall 523. The side wall 523 can be matched and connected to the outside of the feed inlet 41 of the furnace body 4. The area of ​​the inlet end of the vertical flue section 52 is larger than the area of ​​the feed inlet 41.

[0049] As one possible implementation method, such as Figure 4 As shown, the vertical flue section 52 can be an upright cylindrical structure or a square cylindrical structure. The vertical flue section 52 can contain a carbon steel layer 527 and a fire-resistant refractory material layer 526 that are stacked sequentially from the outside to the inside. A water-cooled pipe 528 can be installed inside the fire-resistant refractory material layer 526.

[0050] As an alternative implementation, the movable flue 5 also includes a first lifting mechanism 53 and a translation mechanism 54 connected vertically. The upper end of the first lifting mechanism 53 is fixedly connected to the lower end of the vertical flue section 52. The first lifting mechanism 53 can drive the vertical flue section 52 to move up and down, and the translation mechanism 54 can drive the vertical flue section 52 and the first lifting mechanism 53 to move forward, backward, left, and right. The first lifting mechanism 53 can be an existing hydraulic lifting rod, and the translation mechanism 54 can be an existing electric remote-controlled trolley.

[0051] As one possible implementation method, such as Figure 3As shown, the movable flue 5 also includes a second lifting mechanism 55 and rollers 56 connected vertically. The horizontal flue section 51 includes an upright outlet section 511, a horizontal main body section 512, and an upright inlet section 513 connected sequentially from left to right. The horizontal main body section 512 extends in the left-right direction. The inlet end of the horizontal flue section 51 is located below the upright inlet section 513, with the inlet end of the horizontal flue section 51 facing downwards. The outlet end of the horizontal flue section 51 is located below the upright outlet section 511, with the outlet end of the horizontal flue section 51 facing downwards. The second lifting mechanism 55 can be an existing hydraulic lifting rod.

[0052] The upper end of the second lifting mechanism 55 is fixedly connected to the surface of the horizontal main body section 512. The second lifting mechanism 55 can drive the roller 56 to move up and down. The roller 56 rolls on the horizontal preheating section 2. The roller 56 can facilitate the horizontal flue section 51 to move left and right. The lower end of the vertical inlet section 513 is provided with a second magnetic suction valve 514. When the outlet end of the vertical flue section 52 is connected to the inlet end of the horizontal flue section 51, and the outlet end of the horizontal flue section 51 is connected to the first mixing port 21, the roller 56 can move upward and disengage from the horizontal preheating section 2.

[0053] As one possible implementation method, such as Figure 1 and Figure 5 As shown, the horizontal preheating section 2 contains a first mixing port 21, a second mixing port 22 and a third mixing port 23 arranged sequentially from right to left. The first mixing port 21 is connected to a butterfly valve 211. When the movable fume hood 6 is connected to the feed inlet 41, the outlet end of the movable flue 5 is connected to the second mixing port 22.

[0054] As one possible implementation method, such as Figure 1 , Figure 5 and Figure 6 As shown, the horizontal preheating section 2 includes a first preheating section 24 and a second preheating section 25 arranged on the left and right sides. A cooling water pipe 251 is provided on the side wall of the second preheating section 25. The first air mixing port 21, the second air mixing port 22 and the third air mixing port 23 are all located on the first preheating section 24. An air extraction device 241 is provided on the first preheating section 24. The horizontal preheating section 2 is connected to a preheating section vibrator 26.

[0055] As one possible implementation method, such as Figure 1 and Figure 2As shown, the electric arc furnace also includes a horizontal feeding section 1, which is connected to the horizontal preheating section 2. A scrap steel pressing device 11 is provided between the horizontal feeding section 1 and the horizontal preheating section 2. The scrap steel pressing device 11 is roughly a curtain-type structure and contains multiple hanging steel bars or chains. There is a gap between the scrap steel pressing device 11 and the lower surface of the horizontal feeding section 1. When scrap steel passes through, the higher scrap steel will be scraped down by the scrap steel pressing device 11. The horizontal feeding section 1 is connected to the feeding section vibrator 12.

[0056] As one possible implementation method, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the feeding trolley 3 includes a feeding trough 31, a trolley vibrator 32, and a trolley body 33 connected in sequence. The feeding trough 31, the trolley vibrator 32, and the trolley body 33 can move left and right. The movable fume hood 6 has a cylindrical structure and extends in the left and right direction. The movable fume hood 6 is fitted around the feeding trough 31 and the horizontal preheating section 2. Bottom wheels 61 and rails 62 are connected in sequence below the movable fume hood 6. The movable fume hood 6 can move left and right.

[0057] The movable fume hood 6 includes an upper sidewall, a lower sidewall, a front sidewall, a rear sidewall, and an internal channel. The internal channel extends in the left-right direction. Upward-turned flanges can be provided on the front and rear sides of the feeding trough 31. The upper, front, and rear sidewalls of the movable fume hood 6 are movably and sealingly connected to the horizontal preheating section 2, and the lower sidewall of the movable fume hood 6 is movably and sealingly connected to the feeding trough 31. The movable fume hood 6 can move independently left and right along the feeding trolley 3. The movable fume hood 6 is fixedly connected to the bottom wheels 61 and can move left and right along the track 62. To avoid positional conflicts, the distance between the two tracks 62 in the front-back direction is greater than the front-back dimension of the feeding trolley 3.

[0058] When a large proportion of molten iron is added to the furnace body 4 and smelted, the inlet end of the movable flue 5 is connected to the feed inlet 41, and the outlet end of the movable flue 5 is connected to the first mixing air inlet 21. The vertical flue section 52 is at its upper limit position, the horizontal flue section 51 is at its right limit position, and both the charging trolley 3 and the movable fume hood 6 are at their left limit positions. Both the charging trolley 3 and the movable fume hood 6 are detached from the feed inlet 41. When scrap steel is added to the furnace body 4 and smelted, both the charging trolley 3 and the movable fume hood 6 are at their right limit positions. The charging chute 31 of the charging trolley 3 and the movable fume hood 6 are connected to the feed inlet 41. The inlet end of the movable flue 5 is detached from the feed inlet 41, the outlet end of the movable flue 5 is detached from the first mixing air inlet 21, and the outlet end of the movable flue 5 is connected to the second mixing air inlet 22. The vertical flue section 52 is at its lower limit position, and the horizontal flue section 51 is at its left limit position.

[0059] like Figure 1 , Figure 2 and Figure 3 As shown, when the movable flue 5 is in the working position and both the loading trolley 3 and the movable fume hood 6 are in the waiting position, or when the movable flue 5 is in the waiting position and both the loading trolley 3 and the movable fume hood 6 are in the working position, it should be ensured that there is no conflict between the positions of the loading trolley 3, the movable fume hood 6, and the movable flue 5. Specifically, the dimensions, shapes, and movement trajectories of the loading trolley 3, the movable fume hood 6, and the movable flue 5 can be obtained based on the site conditions and a limited number of experiments.

[0060] The working process of the electric arc furnace is described below (for example, the steel output of the electric arc furnace is 80t).

[0061] Step 1: Both the loading trolley 3 and the movable fume hood 6 retract (move to the left to the waiting position), and the movable fume hood 6 is in the retracted state. Figure 1 and Figure 8 As shown;

[0062] Step 2: Lift the electrode in furnace body 4 and tilt to tap the steel;

[0063] Step 3: Steel tapping ends, no steel remains, furnace body returns to center 4 times;

[0064] Step 4: The vertical flue section 52 is moved upward to its upper limit position, and the inlet end of the vertical flue section 52 is connected to the feed inlet 41 of the furnace body 4.

[0065] Step 5: With the second lifting mechanism 55 extended, the horizontal flue section 51 moves to its rightmost position. The second magnetic valve 514 at the inlet end of the horizontal flue section 51 connects to the first magnetic valve 525 at the outlet end of the vertical flue section 52. The second lifting mechanism 55 retracts, and the roller 56 rises. Figure 1 As shown;

[0066] Step 6: Turn on the vibrator 12 in the feeding section. The scrap steel moves to the right in the horizontal feeding section 1 at a speed of 4t / min. The scrap steel is transported to the left side of the scrap steel pressing device 11 to fill the bottom space between the scrap steel pressing device 11 and the horizontal preheating section 2, and to prevent air from entering the horizontal preheating section 2.

[0067] Step 7: 75t of high-temperature molten iron (>70%) is poured into the molten pool of furnace body 4 through the pouring port 42. The pouring time is about 7 minutes.

[0068] Step 8: Add slagging agent, turn on four oxygen lances, and set the oxygen flow rate to 10,000 Nm. 3 / h, carbon in molten iron reacts with oxygen to produce a large amount of CO;

[0069] Step 9: After smelting for 25 minutes, the carbon content in the molten iron decreased from 3.2% to 0.5%, approaching the end of the smelting process, and the oxygen lance stopped blowing oxygen.

[0070] Step 10: The vertical flue section 52 moves downward to its lower limit position. The loading trolley 3 and the movable fume hood 6 both move to the right to their working positions. The movable fume hood 6 is extended, and its inlet end is connected to the feed inlet 41 of the furnace body 4. The loading chute 31 of the loading trolley 3 extends into the feed inlet 41 of the furnace body 4. Figure 2 and Figure 7 As shown;

[0071] Step 11: The horizontal flue section 51 moves to its leftmost position, and the outlet end of the horizontal flue section 51 is connected to the second mixing inlet 22. The second lifting mechanism 55 is extended, and the roller 56 touches the bottom. Support points for supporting the roller 56 can be provided on the horizontal flue section 51, allowing cold air to enter the second mixing inlet 22 from the horizontal flue section 51. Figure 2 As shown;

[0072] Step 12: Turn on the preheating section vibrator 26 and the trolley vibrator 32. After passing through the scrap steel pressing device 11, the 8t scrap steel enters the horizontal preheating section 2. After being preheated by the mixed high-temperature flue gas, it enters the molten pool of the furnace body 4.

[0073] Step 13: Turn on the oxygen lance and set the oxygen flow rate to 3000 Nm. 3 / h, continue oxygen blowing;

[0074] Step 14: Lower the electrodes and begin supplying power;

[0075] Step 15: After about 5 minutes, the scrap steel will be completely melted, reaching the end of the smelting process;

[0076] Step 16: Lift the electrode, and both the feeding trolley 3 and the movable fume hood 6 retract (move to the left to the waiting position), and tilt to discharge the steel.

[0077] Example 2

[0078] This embodiment is a modification of Embodiment 1. The difference between this embodiment and Embodiment 1 is as follows:

[0079] like Figure 9 As shown, the movable flue 5 is an integral structure. The movable flue 5 includes a horizontal flue section 51 and a vertical flue section 52 arranged vertically. The horizontal flue section 51 and the vertical flue section 52 are connected and fixed as one unit. The horizontal flue section 51 extends in the left and right direction, and the vertical flue section 52 extends in the up and down direction. The movable flue 5 can move back and forth.

[0080] like Figure 10 and Figure 11As shown, the movable fume hood 6 is connected and fixed to the feeding trough 31 of the feeding trolley 3 as a whole. The movable fume hood 6 can move synchronously with the movement of the feeding trolley 3. The movable fume hood 6 has a trough-shaped structure and includes an upper side wall, a front side wall, a rear side wall and an internal channel. The internal channel extends in the left and right direction. The lower ends of the front side wall and the rear side wall of the movable fume hood 6 are connected and fixed to the feeding trough 31. The movable fume hood 6 is fitted inside the horizontal preheating section 2, and the movable fume hood 6 and the horizontal preheating section 2 can be movably and sealed together.

[0081] All other technical features in this embodiment are the same as those in Embodiment 1. To save space, this embodiment will not be described in detail.

[0082] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. An electric arc furnace, characterized in that, The electric arc furnace includes a horizontal preheating section (2), a feeding trolley (3), and a furnace body (4) arranged sequentially from left to right. The electric arc furnace also includes a movable flue (5) and a movable fume hood (6). The left side of the furnace body (4) contains a feed inlet (41). When the movable fume hood (6) is connected to the feed inlet (41), the high-temperature flue gas discharged from the feed inlet (41) can enter the horizontal preheating section (2) through the movable fume hood (6). When the movable flue (5) is connected to the feed inlet (41), the high-temperature flue gas discharged from the feed inlet (41) can enter the horizontal preheating section (2) through the movable flue (5). The high-temperature flue gas discharged from the feed inlet (41) can change direction in the movable flue (5).

2. The electric arc furnace according to claim 1, characterized in that, The movable flue (5) is a split structure. The movable flue (5) contains a horizontal flue section (51) and a vertical flue section (52) set up vertically. The horizontal flue section (51) extends in the left and right direction, and the vertical flue section (52) extends in the up and down direction. The horizontal flue section (51) can move left and right, and the vertical flue section (52) can move up and down.

3. The electric arc furnace according to claim 2, characterized in that, When the active flue (5) is connected to the feed inlet (41), the vertical flue section (52) is located at the upper limit position, the horizontal flue section (51) is located at the right limit position, the inlet end of the vertical flue section (52) is connected to the feed inlet (41), the outlet end of the vertical flue section (52) is connected to the inlet end of the horizontal flue section (51), the horizontal preheating section (2) contains the first mixing air inlet (21), and the outlet end of the horizontal flue section (51) is connected to the first mixing air inlet (21).

4. The electric arc furnace according to claim 2, characterized in that, The vertical flue section (52) includes an upper connecting pipe (521), a top wall (522), a side wall (523), and a bottom wall (524) connected from top to bottom. The upper connecting pipe (521) is in an upright state. A first magnetic suction valve (525) is provided at the upper end of the upper connecting pipe (521). The inlet end of the vertical flue section (52) is located on the side wall (523). The area of ​​the inlet end of the vertical flue section (52) is larger than the area of ​​the feed inlet (41). The vertical flue section (52) includes a carbon steel layer (527) and a fireproof refractory layer (526) connected from the outside to the inside. A water-cooled pipe (528) is provided inside the fireproof refractory layer (526).

5. The electric arc furnace according to claim 2, characterized in that, The movable flue (5) also includes a first lifting mechanism (53) and a translation mechanism (54) connected vertically. The upper end of the first lifting mechanism (53) is connected to the lower end of the vertical flue section (52). The first lifting mechanism (53) can drive the vertical flue section (52) to move up and down, and the translation mechanism (54) can drive the vertical flue section (52) and the first lifting mechanism (53) to move forward, backward and left and right.

6. The electric arc furnace according to claim 2, characterized in that, The movable flue (5) also includes a second lifting mechanism (55) and a roller (56) connected vertically. The horizontal flue section (51) includes an upright outlet section (511), a horizontal main body section (512), and an upright inlet section (513) connected from left to right. The horizontal main body section (512) extends in the left and right direction. The upper end of the second lifting mechanism (55) is connected to the horizontal main body section (512). The second lifting mechanism (55) can drive the roller (56) to move up and down. The roller (56) rolls on the horizontal preheating section (2). The lower end of the upright inlet section (513) is provided with a second magnetic suction valve (514). When the outlet end of the vertical flue section (52) is connected to the inlet end of the horizontal flue section (51), and the outlet end of the horizontal flue section (51) is connected to the first mixing air port (21), the roller (56) can move upward and disengage from the horizontal preheating section (2).

7. The electric arc furnace according to claim 1, characterized in that, The horizontal preheating section (2) contains a first mixing port (21), a second mixing port (22) and a third mixing port (23) arranged from right to left. The first mixing port (21) is connected to a butterfly valve (211). When the movable fume hood (6) is connected to the feed inlet (41), the outlet end of the movable flue (5) is connected to the second mixing port (22).

8. The electric arc furnace according to claim 7, characterized in that, The horizontal preheating section (2) includes a first preheating section (24) and a second preheating section (25) arranged on the left and right sides. The second preheating section (25) includes a cooling water pipe (251). The first mixing port (21), the second mixing port (22) and the third mixing port (23) are all located on the first preheating section (24). The first preheating section (24) is equipped with an air extraction device (241). The horizontal preheating section (2) is connected to a preheating section vibrator (26).

9. The electric arc furnace according to claim 1, characterized in that, The electric arc furnace also includes a horizontal feeding section (1), which is connected to the horizontal preheating section (2) on the left and right. A scrap steel pressing device (11) is provided between the horizontal feeding section (1) and the horizontal preheating section (2). The scrap steel pressing device (11) is a curtain-type structure. The horizontal feeding section (1) is connected to the feeding section vibrator (12).

10. The electric arc furnace according to claim 1, characterized in that, The feeding trolley (3) contains a feeding trough (31), a trolley vibrator (32) and a trolley body (33) connected in sequence. The feeding trough (31), the trolley vibrator (32) and the trolley body (33) can move left and right. The movable fume hood (6) has a cylindrical structure and extends in the left and right direction. The movable fume hood (6) is fitted outside the feeding trough (31) and the horizontal preheating section (2). The bottom wheel (61) and the track (62) are connected in sequence below the movable fume hood (6). The movable fume hood (6) can move left and right.

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