Efficient and uniform heating type scrap steel preheating device and electric furnace scrap steel feeding system

Abstract

The utility model relates to a kind of synergistic soaking type scrap steel preheating device, including feed section, rotary preheating section, discharge section and synchronous frame, rotary preheating section is horizontally provided with rotary cylinder and is equipped with rotary drive mechanism, the both ends of rotary cylinder are respectively connected with feed section and discharge section and it is rotatable relative to feed section and discharge section;Synchronous frame is fixedly connected with feed section and discharge section, feed section is connected with vibrator or is connected with vibrator material tank.In addition, it also relates to the scrap steel preheating device of electric furnace scrap steel feeding system is used.Horizontal arrangement's rotary cylinder can be better applied in horizontal continuous feeding system, scrap steel and flue gas heat exchange speed, heat exchange time controllable, so it can guarantee scrap steel preheating effect, save energy consumption;Feed section and discharge section are connected as integral structure by synchronous frame, and rotary cylinder is rotatably installed on the integral structure, so that feed section, rotary cylinder and discharge section can be resonated with vibrator at the same frequency, which significantly reduces the energy consumption of scrap steel conveying.

Description

Technical Field

[0001] This utility model belongs to the field of electric furnace production technology, specifically relating to an efficiency-enhancing and homogenizing scrap preheating device and an electric furnace scrap feeding system using the scrap preheating device. Background Technology

[0002] Although electric arc furnace steelmaking technology has made significant progress, the overall energy consumption of smelting is still relatively high. Since the flue gas temperature in electric arc furnace steelmaking can reach around 1300℃, the heat carried away by the sensible heat of the flue gas accounts for as much as 13% to 20% of the total input heat. Currently, most enterprises utilize electric arc furnace flue gas to preheat scrap steel. Theoretically, for every 100℃ increase in scrap steel preheating temperature, 20 kWh / ton of steel can be saved. In addition to saving energy and reducing consumption, scrap steel preheating can also shorten the smelting cycle and improve productivity.

[0003] Currently, the most advanced and stable scrap preheating technology in the world is the Consteel electric arc furnace method. Consteel electric arc furnace scrap preheating involves continuously baking and preheating the charge during horizontal transport using high-temperature waste gas generated by the furnace while continuously feeding. The actual temperature of the scrap before entering the furnace reaches 100℃~200℃. The preheated waste gas then enters the waste heat recovery system through the combustion chamber, achieving continuous preheating, continuous feeding, and continuous melting of scrap, thus improving productivity. Although the risk of blockage and steel jamming during scrap preheating in the Consteel electric arc furnace is minimal, the high-temperature waste gas passes through the surface of the scrap layer, leaving the scrap at the bottom largely unheated. This results in a lower average scrap temperature and a still relatively high waste gas outlet temperature, leading to lower waste heat utilization efficiency.

[0004] Chinese patent CN201711022403.6 discloses an electric arc furnace scrap steel processing and continuous feeding preheating device and its usage method. It uses a rotary kiln to preheat scrap steel. Although this method can improve the scrap steel preheating effect to a certain extent, it is not applicable to horizontal continuous feeding systems. In rotary kiln equipment, the scrap steel feeding speed is relatively fast, the heat exchange time with flue gas is short, and the effect needs to be improved. Utility Model Content

[0005] This utility model relates to an efficiency-enhancing, homogenizing scrap preheating device and an electric furnace scrap feeding system using the scrap preheating device, which can at least solve some of the defects of the prior art.

[0006] This utility model relates to an efficiency-enhancing and heat-equalizing scrap steel preheating device, comprising a feeding section, a rotary preheating section, a discharging section, and a synchronization frame. A rotary material cylinder is horizontally arranged in the rotary preheating section and equipped with a rotary drive mechanism for driving the rotary material cylinder to rotate. One end of the rotary material cylinder is connected to the feeding section and is rotatable relative to the feeding section; the other end of the rotary material cylinder is connected to the discharging section and is rotatable relative to the discharging section. The synchronization frame is fixedly connected to both the feeding section and the discharging section. The feeding section is connected to a vibrator or a vibrator trough.

[0007] The feeding section includes a feeding trough and a feeding fume hood covering the feeding trough. The discharging section includes a discharging trough and a discharging fume hood covering the discharging trough. The lower part of the synchronization frame is fixedly connected to the feeding trough and the discharging trough, respectively. The upper part of the synchronization frame is fixedly connected to the feeding fume hood and the discharging fume hood, respectively. The feeding trough is connected to the vibrator or the vibrator trough.

[0008] The discharge end of the feed trough protrudes downward to form a lower flange, and the lower flange is clearance-fitted with the inner wall of the rotary cylinder.

[0009] The joints between the rotary drum and the feed trough, and between the rotary drum and the feed hood, are respectively sealed.

[0010] The discharge end of the rotary drum and the inlet end of the discharge trough are fitted with a clearance fit, as are the discharge end of the rotary drum and the smoke outlet end of the feed hood.

[0011] The bottom of the feed trough, the bottom of the rotary cylinder cavity, and the bottom of the discharge trough are arranged at different heights in sequence.

[0012] The height difference between the bottom of the feed trough and the bottom of the rotary cylinder cavity is in the range of 600~700mm, and the height difference between the bottom of the rotary cylinder cavity and the bottom of the discharge trough is in the range of 600~700mm.

[0013] The synchronous frame adopts an annular cylindrical frame that surrounds the rotating material cylinder.

[0014] The rotary drive mechanism includes a pin gear and a rotary drive unit. The output end of the rotary drive unit is connected to the pin gear. Pin teeth are provided on the outer wall of the rotary cylinder, and the pin teeth mesh with the pin gear.

[0015] This utility model also provides an electric arc furnace scrap steel feeding system, including a scrap steel feeding section and an efficiency-enhancing and homogenizing scrap steel preheating device as described above. The feeding section is connected to the scrap steel feeding section, and the discharge section is connected to the electric arc furnace scrap steel inlet.

[0016] This utility model has at least the following beneficial effects:

[0017] In this invention, a horizontally arranged rotary drum is used as the scrap steel preheating container, which is well-suited for horizontal continuous feeding systems. The heat exchange rate and time between the scrap steel and the flue gas are controllable, thus ensuring the scrap steel preheating effect and saving energy. The feeding section and the discharging section are connected into an integral structure by a synchronous frame, and the rotary drum is rotatably mounted on this integral structure. This allows the feeding section, the rotary drum, and the discharging section to resonate at the same frequency as the vibrator, significantly reducing the energy consumption of scrap steel conveying. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the electric furnace scrap steel feeding system provided in an embodiment of the present utility model;

[0020] Figure 2 A schematic diagram of the structure of the scrap steel preheating device provided in this embodiment of the utility model;

[0021] Figure 3 A cross-sectional view of the scrap steel preheating device provided in an embodiment of this utility model;

[0022] Figure 4 This is a schematic diagram showing the relative positions of the feed chute, inner feed chute, and discharge chute.

[0023] Figure 5 This is a schematic diagram of scrap steel turning over in a rotary drum. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Example 1: As Figure 2 and Figure 3 This utility model provides an efficiency-enhancing and heat-equalizing scrap steel preheating device 1, which includes a rotary preheating section. A rotary material cylinder 111 is horizontally arranged in the rotary preheating section and is equipped with a rotary drive mechanism for driving the rotary material cylinder 111 to rotate.

[0026] The rotary feed cylinder 111 is arranged horizontally, meaning its axis is parallel to the horizontal plane, and this axis serves as its rotation axis. Furthermore, both ends of the rotary feed cylinder 111 are open to facilitate the loading and unloading of scrap steel and electric furnace flue gas.

[0027] Preferably, the outer wall of the rotary cylinder 111 is cylindrical to facilitate rotary motion. For the rotary drive, a transmission unit is preferably provided on the outer wall of the rotary cylinder 111, which is connected to the rotary drive mechanism; this includes, but is not limited to, a pin-gear transmission method. The transmission unit correspondingly uses pins 114, which are evenly arranged around the circumference of the rotary cylinder 111. The rotary drive mechanism correspondingly includes a pin gear 113 and a rotary drive unit 112. The pin gear 113 meshes with the pins 114. The rotary drive unit 112 includes, but is not limited to, a motor, and its output end is connected to the pin gear 113. Obviously, gear drives, chain drives, belt drives, etc., can all be used as alternatives to the pin-gear transmission method, and will not be listed here.

[0028] Optionally, such as Figure 2 A rotary guide mechanism can be provided on one or both sides of the rotary drive point (the position corresponding to the transmission part / rotary drive mechanism) to guide the rotary motion of the rotary cylinder 111 and ensure the stability and reliability of the rotary motion. In one embodiment, the rotary guide mechanism includes multiple support wheels 117, which are arranged sequentially at intervals along the circumference of the rotary cylinder. Each support wheel 117 rolls in contact with the outer wall of the rotary cylinder (the axial direction of the support wheel 117 is parallel to the axial direction of the rotary cylinder). In this scheme, the support wheels 117 not only guide the rotary cylinder 111 in rotation, but also reliably support and limit the rotation of the rotary cylinder 111. Preferably, rotary guide mechanisms are provided on both sides of the rotary drive point, which can ensure the stability of the position of the rotary cylinder 111 and improve the stability of the rotary motion.

[0029] Preferably, the rotary drum 111 is further equipped with an axial limiting mechanism to restrict its axial displacement, limiting the rotary drum 111 to only rotate, thus ensuring the stability and reliability of the rotary drum 111's movement. In one embodiment, such as Figure 2The axial limiting mechanism includes an annular limiting plate 115 and at least one set of limiting wheels 116. The annular limiting plate 115 is coaxially disposed on the outer wall of the rotary cylinder 111. Each set of limiting wheels 116 includes two limiting wheels 116 arranged on both sides of the annular limiting plate 115 along the axial direction of the rotary cylinder 111. The two limiting wheels 116 are in rolling contact with the annular limiting plate 115 respectively (the axis of the limiting wheel 116 is perpendicular to the axis of the rotary cylinder 111). This axial limiting method can ensure the axial limiting effect without affecting the rotational movement of the rotary cylinder 111.

[0030] In one embodiment, Figures 2-5 The inner wall of the rotary material cylinder 111 is provided with a plurality of inner material grooves 118, each of which extends from one end of the rotary material cylinder 111 to the other end, and the inner material grooves 118 are arranged sequentially along the circumference of the rotary material cylinder 111.

[0031] The inner material trough 118 is arranged along the length direction (i.e., the axial direction) of the rotating material cylinder 111. The length direction of the inner material trough 118 is preferably parallel to the axial direction of the rotating material cylinder 111, but it is also feasible to have an angle greater than 0° and less than 90° between the length direction of the inner material trough 118 and the axial direction of the rotating material cylinder 111.

[0032] Having only two inner material troughs 118 within the rotary drum 111 is a feasible solution, but it is preferable to design three or more inner material troughs 118, as this is more beneficial for the preheating of scrap steel. Figure 3 The diagram shows a scheme in which three inner material troughs 118 are formed inside the rotary drum 111; a scheme with more than three inner material troughs 118 is also feasible, but is not shown.

[0033] like Figure 5 During the rotation of the rotary drum 111, scrap steel can flow from one inner trough 118 to an adjacent inner trough 118. By promoting the flow of scrap steel between different inner troughs 118, the scrap steel can be turned over, so that the upper and lower layers of the scrap steel layer can have sufficient heat exchange with the flue gas. At the same time, the rolling and turning of the scrap steel can make the material layer looser, which greatly improves the heat exchange efficiency of the scrap steel layer, and finally the preheating temperature of the scrap steel is greatly improved.

[0034] Each inner trough 118 has two opposing trough walls. In one embodiment, the trough width defined between the two trough walls is consistent from the bottom to the opening; in another embodiment, the trough width defined between the two trough walls gradually increases from the bottom to the opening. Alternatively, a stepped trough design is also feasible for the inner trough 118, in which each segment of the inner trough 118 can adopt either of the aforementioned trough width forms. If the trough width defined between the two trough walls gradually decreases from the bottom to the opening, it may increase the difficulty for scrap steel to escape from the inner trough 118; therefore, it is preferable not to adopt this structure.

[0035] In one embodiment, the planes containing the inner material trough walls 1181 of each group of adjacent inner material troughs 118 intersect, specifically:

[0036] The two inner material trough walls 1181 of each group of adjacent inner material troughs 118 directly intersect each other.

[0037] Alternatively, the two inner material trough walls 1181 of each group of adjacent inner material troughs 118 extend and intersect. In this case, it is preferable that the two inner material trough walls 1181 extend from the bottom of the trough to the outside of the trough opening until they intersect, that is, the intersection is located on the side of the trough opening away from the bottom of the trough.

[0038] Optionally, the dihedral angle between the planes of the inner material trough walls 1181 of each group of adjacent inner material troughs 118 is within the range of 80° to 150°, which facilitates the transfer and flow of scrap steel between the two adjacent inner material troughs 118.

[0039] Preferably, such as Figure 3 The scheme of "the two inner material trough walls 1181 of each group of adjacent inner material troughs 118 directly intersect" is more conducive to the transfer and flow of scrap steel between two adjacent inner material troughs 118.

[0040] like Figure 5 In use, as the rotary drum 111 rotates, the scrap steel rotates together with the inner material trough 118. Since the inner material trough 118 has a certain height, the scrap steel will not immediately tumble when it starts to rotate. After rotating to a certain angle, the scrap steel will begin to fall into the adjacent inner material trough 118 in the opposite direction of the rotary drum 111 under the action of gravity. Since there are trough walls between the inner material troughs 118, the scrap steel will slide down along the intersecting inner material trough walls 1181 into another inner material trough 118. Since the upper layer of scrap steel has no accumulation effect, the upper layer of scrap steel will flip first. As the angle of the rotary drum 111 increases, the scrap steel will slowly fall from the upper layer to the lower layer. The intersecting inner material trough walls 1181 also play an auxiliary role in making the scrap steel layer flip up and down. After the rotary drum 111 rotates to a certain angle, the upper and lower layers of scrap steel are completely switched. The lower layer of scrap steel with a lower temperature will be baked and heat exchanged with the flue gas.

[0041] Further optimize the above-mentioned scrap steel preheating device 1, such as... Figure 2 The aforementioned scrap steel preheating device 1 further includes a feeding section and a discharging section. One end of the rotary drum 111 is connected to the feeding section and is rotatable relative to the feeding section; the other end of the rotary drum 111 is connected to the discharging section and is rotatable relative to the discharging section.

[0042] In one embodiment, such as Figure 2 The feeding section includes a feeding trough 121 and a feeding fume hood 122 covering the feeding trough 121. Preferably, the feeding trough 121 and the feeding fume hood 122 are detachably fixed together, and a seal can be provided at their connection point to improve sealing. The rotary drum 111 can rotate relative to the feeding trough 121 and the feeding fume hood 122. Therefore, the rotary drum 111 is not fixedly connected to the feeding trough 121 or to the feeding fume hood 122. This allows for a clearance fit between the feeding end of the rotary drum 111 and the discharge end of the feeding trough 121, and between the feeding end of the rotary drum 111 and the smoke inlet end of the feeding fume hood 122. This ensures that the rotary drum 111 can rotate freely while reducing the escape of flue gas and dust between the rotary drum 111 and the feeding trough 121, and between the rotary drum 111 and the feeding fume hood 122. Optionally, such as Figure 2 The discharge end of the feed trough 121 protrudes downward to form a lower flange, which is clearance-fitted with the inner wall of the rotary drum 111. This method facilitates the transfer of scrap steel from the feed trough 121 to the rotary drum 111. The outer wall of the feed hood 122 is clearance-fitted with the inner wall of the rotary drum 111.

[0043] Furthermore, such as Figure 2 The joints between the rotary drum 111 and the feed trough 121, and between the rotary drum 111 and the feed hood 122 are sealed, including but not limited to using an annular seal 14 to seal the two joints simultaneously. The annular seal 14 can be installed at the feed end of the rotary drum 111 and rotate with the rotary drum 111, or it can be installed on the feed trough 121 and the feed hood 122. Both methods can achieve dynamic sealing through the annular seal 14.

[0044] In one embodiment, such as Figure 2The discharge section includes a discharge trough 131 and a discharge fume hood 132 covering the discharge trough 131. Preferably, the discharge trough 131 and the discharge fume hood 132 are detachably fixed together, and a sealing element can be provided at the connection between the two to improve the sealing performance. The rotary drum 111 can rotate relative to the discharge chute 131 and the discharge hood 132. Therefore, there is no fixed connection between the rotary drum 111 and the discharge chute 131, or between the rotary drum 111 and the discharge hood 132. This allows for a clearance fit between the discharge end of the rotary drum 111 and the feed end of the discharge chute 131, and between the discharge end of the rotary drum 111 and the smoke outlet end of the feed hood 122. This ensures that the rotary drum 111 can rotate freely, while reducing the escape of flue gas and dust from between the rotary drum 111 and the discharge chute 131, and between the rotary drum 111 and the discharge hood 132, as well as the entry of outside air. Optionally, such as Figure 2 The feed end of the discharge trough 131 protrudes upward to form an upper flange, which is clearance-fitted with the outer wall of the rotary drum 111. This method facilitates the transfer of scrap steel from the rotary drum 111 to the discharge trough 131; the inner wall of the discharge hood 132 is clearance-fitted with the outer wall of the rotary drum 111.

[0045] Furthermore, such as Figure 2 The joint between the rotary material cylinder 111 and the discharge hood 132 is sealed, including but not limited to sealing the joint with a sealing plate 15. The sealing plate 15 is preferably installed on the inner wall of the discharge hood 132 and abuts against the discharge end of the rotary material cylinder 111. It maintains contact with the rotary material cylinder 111 during rotation to achieve dynamic sealing. When the sealing plate 15 is made of an elastic sealing material with a certain degree of elasticity, its dynamic contact effect with the rotary material cylinder 111 is better.

[0046] A seal can also be provided at the joint between the rotary drum 111 and the discharge chute 131. This seal is preferably located on the outer surface of the upper flange and contacts the outer wall of the rotary drum 111, thus avoiding interference with the scrap steel inside the discharge chute 131. In another optional embodiment, such as... Figure 2 The sealing at this location can be achieved using the support wheel 117 on the corresponding side. This structure also facilitates the installation of the support wheel 117, for example, by mounting one end of the axle of the support wheel 117 onto the upper flange. Similarly, the support wheel 117 can also be used to seal the joint between the rotating material cylinder 111 and the discharge hood 132 from the outside.

[0047] Furthermore, such as Figure 2 The scrap steel preheating device 1 also includes a synchronization frame 16, which is fixedly connected to the feeding section and the discharging section respectively. The feeding section is connected to a vibrator or a vibrator trough.

[0048] In the structure where the feeding section includes a feeding trough 121 and a feeding fume hood 122, and the discharging section includes a discharging trough 131 and a discharging fume hood 132, the lower part of the synchronous frame 16 is fixedly connected to the feeding trough 121 and the discharging trough 131, respectively, and the upper part of the synchronous frame 16 is fixedly connected to the feeding fume hood 122 and the discharging fume hood 132, respectively; the feeding trough 121 is connected to a vibrator or a vibrator trough.

[0049] Based on the above structure, the feeding chute 121 and the discharge chute 131 are connected into an integral structure by the synchronous frame 16, and the rotary drum 111 is rotatably installed on the integral structure. In this way, the feeding chute 121, the rotary drum 111 and the discharge chute 131 can resonate with the vibrator at the same frequency, so that the scrap steel is continuously conveyed forward into the electric furnace 3.

[0050] Among them, the aforementioned rotary drive unit 112, limit wheel 116, support wheel 117 and other components can be installed on the synchronous frame 16. Therefore, the installation of the synchronous frame 16 can greatly facilitate the installation of related supporting facilities of the rotary drum 111, and correspondingly simplify the structure of the scrap steel preheating device 1.

[0051] More preferably, the synchronizing frame 16 adopts an annular cylindrical frame body, which surrounds the rotating material cylinder 111. This not only facilitates the connection between the synchronizing frame 16 and the feeding trough 121, the discharging trough 131, the feeding fume hood 122, and the discharging fume hood 132, but also makes it easier to ensure the sealing performance of the connection between the synchronizing frame 16 and the feeding trough 121, the discharging trough 131, the feeding fume hood 122, and the discharging fume hood 132. This greatly improves the sealing performance of the scrap steel preheating device 1 and can avoid situations such as poor dynamic sealing leading to the escape of flue gas and dust and the entry of outside air.

[0052] Preferably, such as Figure 4 The bottom of the feed trough 121, the bottom of the cylinder cavity of the rotary material cylinder 111, and the bottom of the discharge trough 131 are arranged at different heights to facilitate the flow of scrap steel and to facilitate the turning and loosening of scrap steel. Optionally, the height difference between the bottom of the feed trough 121 and the bottom of the cylinder cavity of the rotary material cylinder 111 is in the range of 600~700mm, and the height difference between the bottom of the cylinder cavity of the rotary material cylinder 111 and the bottom of the discharge trough 131 is in the range of 600~700mm.

[0053] Additionally, preferably, such as Figure 3 and Figure 4The width of the feed trough 121 is smaller than the width of the inner material trough 118. Optionally, a connecting cross section is provided at the discharge end of the feed trough 121. The width of this connecting cross section gradually increases from the feed trough 121 towards the rotary drum 111, so as to facilitate a better connection between the feed trough 121 and the inner material trough 118. Similarly, the width of the discharge trough 131 is larger than the width of the inner material trough 118. Optionally, a connecting cross section is provided at the feed end of the discharge trough 131. The width of this connecting cross section gradually increases from the rotary drum 111 towards the discharge trough 131, so as to facilitate a better connection between the discharge trough 131 and the inner material trough 118.

[0054] Example 2: Figure 1 This utility model provides an electric arc furnace scrap steel feeding system, including a scrap steel feeding section 2 and a scrap steel preheating device 1 provided in the above embodiment 1. The feeding section is connected to the scrap steel feeding section 2, and the discharge section is connected to the electric arc furnace scrap steel inlet.

[0055] Optionally, the scrap steel feeding section 2 is connected to the scrap steel preheating device 1 via a central vibrator; as described in Embodiment 1, the feed trough 121 can be connected to the vibrator trough of the central vibrator. In the scrap steel feeding section 2, scrap steel is added to the feeding section trough by a feeding device such as a disk crane, steel grabber, or chain conveyor, and then vibrates forward by the vibrator at the tail of the scrap steel feeding section 2, passing through the central vibrator and the scrap steel preheating device 1 before being added to the electric furnace 3 for smelting.

[0056] The discharge hood 132 is connected to the flue gas outlet of the electric furnace 3. The flue gas from the electric furnace enters the rotary drum 111 from the discharge hood 132 and is then discharged from the feed hood 122. The feed hood 122 can be connected to a flue gas outlet pipe for subsequent treatment of the electric furnace flue gas.

[0057] Optionally, the scrap steel preheating device 1 can be connected to the scrap steel inlet of the electric furnace 3 via a feeding trolley or the like.

[0058] In one embodiment, such as Figure 1 Multiple scrap steel preheating devices can be connected in series to achieve multi-stage preheating of scrap steel, which can further improve the preheating effect and efficiency of scrap steel, and also improve the utilization of waste heat from electric furnace flue gas.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency, uniformly heated scrap steel preheating device, characterized in that, It includes a feeding section, a rotary preheating section, a discharging section, and a synchronization frame. The rotary preheating section has a horizontally arranged rotary cylinder and a rotary drive mechanism for driving the rotary cylinder to rotate. One end of the rotary cylinder is connected to the feeding section and is rotatable relative to the feeding section. The other end of the rotary cylinder is connected to the discharging section and is rotatable relative to the discharging section. The synchronization frame is fixedly connected to the feeding section and the discharging section respectively. The feeding section is connected to a vibrator or a vibrator trough.

2. The enhanced uniform heating type scrap steel preheating device as described in claim 1, characterized in that, The feeding section includes a feeding trough and a feeding fume hood covering the feeding trough. The discharging section includes a discharging trough and a discharging fume hood covering the discharging trough. The lower part of the synchronization frame is fixedly connected to the feeding trough and the discharging trough, respectively. The upper part of the synchronization frame is fixedly connected to the feeding fume hood and the discharging fume hood, respectively. The feeding trough is connected to the vibrator or the vibrator trough.

3. The enhanced homogenization type scrap steel preheating device as described in claim 2, characterized in that: The discharge end of the feed trough protrudes downward to form a lower flange, and the lower flange is clearance-fitted with the inner wall of the rotary cylinder.

4. The enhanced homogenization type scrap steel preheating device as described in claim 2, characterized in that: The joints between the rotary drum and the feed trough, and between the rotary drum and the feed hood, are respectively sealed.

5. The enhanced homogenization type scrap steel preheating device as described in claim 2, characterized in that: The discharge end of the rotary drum and the inlet end of the discharge trough are fitted with a clearance fit, as are the discharge end of the rotary drum and the smoke outlet end of the feed hood.

6. The enhanced homogenization type scrap steel preheating device as described in claim 2, characterized in that: The bottom of the feed trough, the bottom of the rotary cylinder cavity, and the bottom of the discharge trough are arranged at different heights in sequence.

7. The enhanced homogenization type scrap steel preheating device as described in claim 6, characterized in that: The height difference between the bottom of the feed trough and the bottom of the rotary cylinder cavity is in the range of 600~700mm, and the height difference between the bottom of the rotary cylinder cavity and the bottom of the discharge trough is in the range of 600~700mm.

8. The enhanced homogenization type scrap steel preheating device according to any one of claims 1 to 7, characterized in that: The synchronous frame adopts an annular cylindrical frame that surrounds the rotating material cylinder.

9. The enhanced homogenization type scrap steel preheating device as described in claim 1, characterized in that: The rotary drive mechanism includes a pin gear and a rotary drive unit. The output end of the rotary drive unit is connected to the pin gear. Pin teeth are provided on the outer wall of the rotary cylinder, and the pin teeth mesh with the pin gear.

10. An electric arc furnace scrap steel feeding system, comprising a scrap steel feeding section, characterized in that, It also includes the enhanced homogenization type scrap steel preheating device as described in any one of claims 1 to 9, wherein the feeding section is connected to the scrap steel feeding section, and the discharge section is connected to the electric furnace scrap steel inlet.

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