Continuous shaft scrap steel preheating device and electric furnace steelmaking equipment

Abstract

The present invention is a continuous vertical shaft scrap steel preheating device and electric furnace steelmaking equipment. The continuous vertical shaft scrap steel preheating device includes a vertical shaft structure, a chute section and a control unit. The vertical shaft structure includes at least two parallel vertical shafts, each of which is arranged with equal cross-sections; a continuous feeding structure is arranged at the top of each vertical shaft, and the two ends of the continuous feeding structure are arranged to be closed or opened; a smoke suction port is arranged at the top of the side wall of each vertical shaft; an electromagnetic brake is arranged on the side wall near the bottom of each vertical shaft, and the bottom of each vertical shaft is connected to the chute section, which is arranged with equal cross-sections; a finger valve that can open or close the chute section is arranged at the bottom of the chute section. The vertical shaft and the chute section of the present invention are arranged with equal cross-sections to ensure that there is no risk of scrap steel being stuck throughout the process; the continuous feeding structure ensures sealed feeding throughout the process, and the use process is safe and reliable. The electromagnetic brake and the finger valve work in coordination, and have good economy.

Description

Technical Field

[0001] The invention relates to the technical field of electric furnace steelmaking, and in particular to a continuous shaft scrap steel preheating device and electric furnace steelmaking equipment. Background Art

[0002] Electric furnace steelmaking is a steelmaking process that mainly uses scrap steel as raw material. It does not require the construction of an ironmaking system, so it is also called short-process steelmaking technology. At present, compared with the long process of blast furnace and converter, the short-process steelmaking of electric furnaces emits about 60% less pollutants and is more environmentally friendly. The production cost of electric furnace steelmaking is higher than that of converters, which weakens the competitiveness of electric furnace steelmaking technology and seriously hinders the rapid increase in the proportion of electric furnace steelmaking. The scrap steel preheating electric furnace directly uses the high-temperature flue gas generated during the electric furnace smelting process to preheat the scrap steel, which can reduce the power consumption per ton of steel by 20 to 100 kWh / t. It has a strong energy-saving and cost-reducing effect and has become a hot technology for the development of electric furnace steelmaking processes.

[0003] At present, Consteel electric furnace is widely used because of its low heat load of charging device, low equipment failure rate and no risk of water leakage. However, the scrap steel of this type of furnace is added into the furnace through a horizontal vibration device. The horizontal vibration device is divided into two parts: the charging section (without cover) and the preheating section (with cover). In the charging section, the scrap steel is adsorbed by the magnetic disk of the scrap steel crane and added to the horizontal vibration device. Then, driven by the horizontal vibration, the scrap steel enters the preheating section. In the preheating section, due to the action of gravity, the scrap steel lies flat on the horizontal vibration device (the bottom area of ​​the preheating section), while the high-temperature flue gas passes through the top of the preheating section. In this way, the convection heat exchange between the high temperature and the scrap steel is insufficient, and the preheating effect is poor. The average preheating temperature of the scrap steel is 200℃, and the power consumption per ton of steel is saved by 20-30kWh / t. The energy saving effect is not significant. Under the condition of 100% scrap steel raw material, the power consumption per ton of steel is 350kWh / t.

[0004] There is an environmentally friendly device in the prior art that uses the exhaust gas discharged from an electric arc furnace to preheat metal materials. The key is to set a multi-layer hydraulic cylinder-driven finger valve structure inside the shaft to hold multiple layers of scrap steel for vertical multi-layer preheating. The preheated scrap steel is added in batches to the horizontal vibrating feeding trough at the bottom of the shaft by controlling the finger valve to open in layers. The horizontal vibrating feeding trough continuously adds small batches of preheated scrap steel in the shaft to the molten pool of the electric furnace. At the same time, a receiving hopper is provided at the top of the shaft, and a closed door is provided at the bottom of the receiving hopper. A second closed door is provided between the first closed door and the first layer of finger valve structure in the shaft, and a dust removal port is provided on the side wall between the second closed door and the first layer of finger valve structure. The problems with this technology are:

[0005] 1) The existing technology uses a vertical shaft structure with multiple layers of finger valves. When feeding from the vertical shaft to the horizontal feeding trough, the finger valve of the next layer needs to be opened and then closed before the finger valve of the previous layer can be opened. The opening and closing time is long, and the operation control logic is cumbersome and complicated, which will reduce the production operation efficiency. In addition, the finger valve of this technology is driven by a hydraulic cylinder to rotate downward around the rotating axis in the vertical shaft to open, which requires that the highest point after the scrap steel falls cannot hinder the closing of the finger valve, which is difficult to control in the actual operation process, and there is a risk that the finger valve cannot be closed after opening.

[0006] 2) The existing equipment has a complex structure, high failure rate, large maintenance, high probability of water leakage from multi-layer fingers, and low safety;

[0007] 3) Once the finger valve fails in the shaft and cannot be closed, the finger valve cannot be withdrawn from the shaft, making it easier to repair.

[0008] There is also a steelmaking equipment in the prior art, including a shaft preheater and an electric arc furnace. The shaft preheater contains a shaft and an electromagnetic brake. The electromagnetic brake can generate a magnetic field to make the steelmaking raw materials entering the shaft stay in the shaft; the lower end of the shaft is connected to the entrance of the steelmaking raw materials. The steelmaking equipment uses the electromagnetic brake to capture the steelmaking raw materials to form a suspended material column, and the material column formed by the steelmaking raw materials captured by the electromagnetic brake carries the steelmaking raw materials falling from the upper part. The problems with this technology are:

[0009] 1) It is impossible to continuously add scrap steel into the furnace in small batches. Scrap steel can only be added to the furnace in large quantities after preheating for a period of time. When adding scrap steel, it is necessary to cut off the power and lift the electrode to prevent the electrode from being damaged by the scrap steel, which prolongs the power off time and reduces the production efficiency of the electric furnace.

[0010] 2) It is impossible to overcome the impact of subsequent scrap steel added on the scrap steel adsorbed on the electromagnetic disk. The scrap steel adsorbed on the electromagnetic disk will fall into the furnace in a disorderly manner when impacted by the subsequent scrap steel added.

[0011] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a continuous shaft scrap steel preheating device and electric furnace steelmaking equipment to overcome the defects of the prior art. Summary of the invention

[0012] The purpose of the present invention is to provide a continuous shaft scrap steel preheating device and electric furnace steelmaking equipment, which solves the problems existing in the prior art. The shaft and the chute section of the present invention are arranged with equal cross-sections to ensure that there is no risk of scrap steel getting stuck throughout the entire process; the continuous feeding structure ensures sealed feeding throughout the entire process, and the use process is safe and reliable. The electromagnetic brake works in conjunction with the finger valve, which has good economy.

[0013] The object of the present invention is achieved in this way. A continuous vertical shaft scrap preheating device includes a vertical shaft structure, a chute section and a control unit, wherein the vertical shaft structure includes at least two parallel vertical shafts, each of which is arranged with an equal cross-section; a continuous feeding structure is arranged at the top of each vertical shaft, and the two ends of the continuous feeding structure are respectively arranged to be closable or open; a smoke suction port is respectively arranged at the top of the side wall of each vertical shaft; an electromagnetic brake is respectively arranged on the side wall near the bottom end of each vertical shaft, and the bottom of each vertical shaft is connected to the chute section, and the chute section is arranged with an equal cross-section; a finger valve that can open or close the chute section is arranged at the bottom of the chute section; the continuous feeding structure, the electromagnetic brake and the finger valve are all electrically connected to the control unit.

[0014] In a preferred embodiment of the present invention, a transition inclined pipe is arranged at the bottom of each of the vertical shafts, the bottom of each of the transition inclined pipes is connected to the slide pipe section, and each of the transition inclined pipes is arranged with an equal cross-section; the electromagnetic brake is located above the transition inclined pipe.

[0015] In a preferred embodiment of the present invention, the continuous feeding structure includes a silo, a first end of the silo is connected to each of the vertical shafts via a first valve, and the first valve is electrically connected to the control unit.

[0016] In a preferred embodiment of the present invention, the top of the silo is connected to the feeding hopper via a second valve, and the second valve is electrically connected to the control unit.

[0017] In a preferred embodiment of the present invention, the first valve is a gate valve.

[0018] In a preferred embodiment of the present invention, the second valve is a gate valve.

[0019] In a preferred embodiment of the present invention, the diameter of the feeding hopper is gradually reduced from top to bottom.

[0020] In a preferred embodiment of the present invention, a transition inclined plate is provided at the top of each of the vertical shafts.

[0021] The object of the present invention can also be achieved in this way. An electric furnace steelmaking equipment includes a charging device, a continuous vertical shaft scrap steel preheating device, an electric furnace charging and conveying structure and an electric furnace. The continuous vertical shaft scrap steel preheating device is located above the electric furnace charging and conveying structure. The charging device is used to charge the continuous vertical shaft scrap steel preheating device. The electric furnace charging and conveying structure is used to add the scrap steel preheated by the continuous vertical shaft scrap steel preheating device to the electric furnace.

[0022] In a preferred embodiment of the present invention, the finger valve at the bottom of the continuous vertical shaft scrap steel preheating device is staggered with the electric furnace.

[0023] As described above, the continuous shaft scrap steel preheating device and electric furnace steelmaking equipment of the present invention have the following beneficial effects:

[0024] In the present invention, a shaft-type preheating method is adopted, which can maximize the use of flue gas waste heat and reduce the power consumption during electric furnace production; the shaft and the chute section are both set with equal cross-sections to ensure that there is no risk of scrap steel getting stuck throughout the process; the continuous feeding structure connected to the top of the shaft can be closed to ensure sealed feeding throughout the process, and the continuous feeding structure adopts a sealed bin + double-layer plug valve structure to ensure the effective sealing of the flue gas channel and avoid the problem of flue gas overflow and mixing with wild wind during the preheating process; an electromagnetic brake is adopted without a direct force-bearing part, which improves the safety of system operation under the premise of controllable scrap steel addition and no water leakage problem; the electromagnetic brake cooperates with the finger valve, and the electromagnetic brake is in a power-off and closed state for a long time, and is only opened for short-term use when the scrap steel is released, which has good economy; the finger valve is staggered with the electric furnace to effectively avoid accidents of water leakage into the electric furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0026] Figure 1 : It is the front view of the continuous vertical shaft scrap steel preheating device of the present invention.

[0027] Figure 2 : It is a side view of the continuous vertical shaft scrap steel preheating device of the present invention.

[0028] Figure 3 : It is the state diagram after adding materials into the feeding hopper in step a.

[0029] Figure 4 : It is the state diagram of the process of feeding hopper into silo in step a.

[0030] Figure 5 : This is the state diagram after the feeding hopper adds materials to the silo in step a.

[0031] Figure 6 : It is the state diagram of the silo adding materials into the shaft in step b.

[0032] Figure 7 : Schematic diagram of the preheating working status in the shaft in step b.

[0033] Figure 8 : Schematic diagram of the electromagnetic brake being energized and the finger valve being opened for blanking in step c.

[0034] Fig. 9 : This is a schematic diagram after the finger valve is closed and the electromagnetic brake is powered off in step d.

[0035] Fig.10: is the schematic diagram of electric furnace steelmaking equipment of the present invention.

[0036] In the figure:

[0037] 100. Continuous shaft scrap steel preheating device;

[0038] 1. Vertical shaft structure; 11. Vertical shaft; 12. Transition inclined pipe; 13. Transition inclined plate;

[0039] 2. Slide pipe section;

[0040] 3. Continuous feeding structure; 31. First valve; 32. Second valve; 33. Feed bin; 34. Feed hopper;

[0041] 4. Finger valve;

[0042] 5. Smoke extraction port;

[0043] 6. Electromagnetic brake;

[0044] 7. Scrap steel;

[0045] 200. Electric furnace steelmaking equipment; 201. Charging device; 202. Electric furnace charging and conveying structure; 203. Electric furnace. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0047] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0049] like Figure 1 , Figure 2 As shown, the present invention provides a continuous shaft scrap preheating device 100, including a shaft structure 1, a chute section 2 and a control unit, the shaft structure 1 includes at least two parallel shafts 11, each shaft 11 is arranged with an equal cross-section; a continuous feeding structure 3 is arranged at the top of each shaft 11, and the two ends of the continuous feeding structure 3 are respectively arranged to be closable or open; a smoke suction port 5 is respectively arranged at the top of the side wall of each shaft 11; an electromagnetic brake 6 is respectively arranged on the side wall near the bottom of each shaft 11, and the bottom of each shaft is connected to the chute section 2, and the chute section 2 is arranged with an equal cross-section; a finger valve 4 that can open or close the chute section is arranged at the bottom of the chute section 2; the continuous feeding structure 3, the electromagnetic brake 6 and the finger valve 4 are all electrically connected to the control unit.

[0050] The present invention provides a continuous vertical shaft scrap steel preheating device, in which a vertical shaft 11 and a chute section 2 are connected to form a scrap steel channel, and the vertical shaft 11 and the chute section 2 are respectively arranged with equal cross-sections to ensure that the scrap steel 7 has no risk of being stuck throughout the entire process; a finger valve 4, a chute section 2, a vertical shaft 11 and a smoke suction port 5 are connected to form a smoke channel, and the high-temperature smoke of the electric furnace (existing technology) enters the smoke channel through the finger valve 4 to preheat the scrap steel. The continuous feeding structure 3 connected to the top of the vertical shaft 11 can be closed, thereby ensuring the effective sealing of the smoke channel and avoiding the problem of smoke overflow and mixing with wild wind during the preheating work. When the finger valve 4 is opened, the scrap steel falls; when the finger valve 4 is closed, the scrap steel can be supported from the bottom, and the high-temperature flue gas can enter the flue gas channel from the gap of the finger valve to preheat the scrap steel; when the electromagnetic brake 6 is in the started state, the scrap steel above the control range of the electromagnetic brake 6 can be kept suspended and cannot move downward; the electromagnetic brake 6 works in conjunction with the finger valve 4, and the electromagnetic brake 6 is in a power-off and closed state for a long time, and is only opened for short-term use when releasing the scrap steel, which has good economy.

[0051] The present invention provides a continuous shaft scrap steel preheating device, which adopts a shaft preheating method, can maximize the use of flue gas waste heat and reduce power consumption during electric furnace production; the shaft and the chute section are both arranged with equal cross-sections to ensure that there is no risk of scrap steel being stuck throughout the entire process; the continuous feeding structure connected to the top of the shaft can be closed, ensuring sealed feeding throughout the entire process, ensuring the effective sealing of the flue gas channel, and avoiding the problems of flue gas overflow and mixing with wild wind during the preheating process; an electromagnetic brake is adopted without a direct force-bearing part, which improves the safety of system operation under the premise of ensuring that the addition of scrap steel is controllable, and there is no water leakage problem; the electromagnetic brake cooperates with the finger valve, and the electromagnetic brake is in a power-off and closed state for a long time, and is only opened for short-term use when the scrap steel is released, which has good economy.

[0052] Further, if Figure 1 , Figure 2 As shown, a transition inclined pipe 12 is arranged at the bottom of each shaft 11, and the bottom of each transition inclined pipe 12 is connected to the slide pipe section 2, and each transition inclined pipe 12 is arranged with a uniform cross section; the electromagnetic brake 6 is located above the transition inclined pipe. The outer wall of the shaft can be water-cooled or insulated, and the equipment protection is relatively simple.

[0053] Further, if Figure 1 , Figure 2 As shown, the continuous feeding structure 3 includes a silo 33, a first end of which is connected to each shaft via a first valve 31, and the first valve 31 is electrically connected to a control unit, which controls the closing or opening of the first valve 31. In this embodiment, the first valve 31 is a gate valve.

[0054] Further, if Figure 1 , Figure 2 As shown, the top of the silo 33 is connected to the feeding hopper 34 through the second valve 32. The second valve 32 is electrically connected to the control unit, and the control unit controls the closing or opening of the second valve 32. In this embodiment, the second valve 32 is a gate valve.

[0055] Furthermore, the diameter of the feeding hopper 34 is gradually reduced from top to bottom.

[0056] Further, if Figure 1 , Figure 2 As shown, in order to allow the scrap steel in the silo 33 to smoothly enter the shaft 11 , a transition inclined plate 13 is provided at the top of each shaft 11 .

[0057] When adding materials to the silo 33, the first valve 31 is closed and the second valve 32 is opened, and the scrap steel enters the silo 33 through the feeding hopper 34. The amount of scrap steel added each time cannot exceed the volume of the silo 33, and it must be ensured that the second valve 32 can be effectively closed; wait until the scrap steel completely enters the silo 33, and then close the second valve 32.

[0058] When adding material to the shaft 11 , the first valve 31 is opened, so that the scrap steel falls from the silo 33 into the shaft 11 of uniform cross-section.

[0059] After adding materials, the first valve 31 and the second valve 32 are closed, the silo 33 is in a closed state, the finger valve 4, the chute section 2, the vertical shaft 11 and the smoke suction port 5 are connected to form a smoke channel, and the smoke enters the smoke channel through the finger valve 4. The preheated smoke can only be extracted by the fan (existing technology) through the smoke suction port 5.

[0060] Through the aforementioned feeding operation, the continuous vertical shaft scrap steel preheating device 100 continuously transports scrap steel into the electric furnace or the scrap steel transport device (existing technology) and ensures that the added scrap steel is effectively preheated.

[0061] The continuous feeding structure 3 adopts the structure of a sealed bin + double-layer plug valve, which can effectively seal the smoke channel and basically prevent smoke from overflowing and mixing with wild wind during the feeding process.

[0062] like Fig.10 As shown, the present invention also provides an electric furnace steelmaking equipment 200, including a feeding device 201, a continuous vertical shaft scrap steel preheating device 100, an electric furnace feeding and conveying structure 202 and an electric furnace 203, wherein the continuous vertical shaft scrap steel preheating device 100 is located above the electric furnace feeding and conveying structure 202, the feeding device 201 is used for feeding the continuous vertical shaft scrap steel preheating device 100, and the electric furnace feeding and conveying structure 202 is used for adding the scrap steel preheated by the continuous vertical shaft scrap steel preheating device into the electric furnace 203.

[0063] Furthermore, the finger valve 4 at the bottom of the continuous shaft scrap preheating device 100 is staggered with the electric furnace 203, which effectively avoids accidents of water leakage into the electric furnace.

[0064] The working process of the continuous shaft scrap steel preheating device 100 of the present invention is as follows:

[0065] Step a: Figure 3 As shown, the first valve 31, the second valve 32 and the finger valve 4 are closed, the electromagnetic brake 6 is powered off, and the feeding device 201 transports the scrap steel 7 to the feeding hopper 34 and adds it into the feeding hopper 34; Figure 4 As shown, the second valve 32 is opened, and the scrap steel in the feeding hopper 34 is added to the silo 33. The amount of scrap steel added each time cannot exceed the volume of the silo 33, and the second valve 32 must be effectively closed; Figure 5 As shown, wait until the scrap steel completely enters the silo 33 and then close the second valve 32;

[0066] Step b: Figure 6As shown, the first valve 31 is opened, and the scrap steel in the silo 33 falls into the shaft 11. The finger valve 4 holds the scrap steel from the bottom of the chute section 2. At this time, the second valve 32 is in a closed state, and the smoke will not overflow from the top of the shaft. The high-temperature smoke enters the chute section 2 and the shaft 11 through the finger valve 4, and is finally discharged through the smoke suction port 5. After all the scrap steel in the silo 33 falls into the shaft 11, as shown in FIG. Figure 7 As shown, the first valve 31 is closed, and the scrap steel enters the preheating process; the high-temperature flue gas enters the chute section 2 and the shaft 11 through the finger valve 4 to preheat the scrap steel, and is finally discharged through the flue gas suction port 5 (extracted by the fan);

[0067] Step c: After the flue gas is preheated for a set time, the electromagnetic brake 6 is powered on to start, so that the scrap steel above its control range cannot move downward. Figure 8 As shown, the finger valve 4 is opened, and the scrap steel below the electromagnetic brake 6 falls through the finger valve 4;

[0068] Step d: Fig. 9 As shown, the finger valve 4 is closed, and the electromagnetic brake 6 is powered off, the scrap steel in the shaft falls, and the finger valve 4 holds the scrap steel from the bottom of the slide pipe section 2 to continue preheating;

[0069] Step e, repeating steps a, b, c and d, continuously delivering scrap steel into the electric furnace or the scrap steel transport device, and ensuring that the added scrap steel is effectively preheated.

[0070] As described above, the continuous shaft scrap steel preheating device and electric furnace steelmaking equipment of the present invention have the following beneficial effects:

[0071] In the present invention, a shaft-type preheating method is adopted, which can maximize the use of flue gas waste heat and reduce the power consumption during electric furnace production; the shaft and the chute section are both set with equal cross-sections to ensure that there is no risk of scrap steel getting stuck throughout the process; the continuous feeding structure connected to the top of the shaft can be closed to ensure sealed feeding throughout the process, and the continuous feeding structure adopts a sealed bin + double-layer plug valve structure to ensure the effective sealing of the flue gas channel and avoid the problem of flue gas overflow and mixing with wild wind during the preheating process; an electromagnetic brake is adopted without a direct force-bearing part, which improves the safety of system operation under the premise of controllable scrap steel addition and no water leakage problem; the electromagnetic brake cooperates with the finger valve, and the electromagnetic brake is in a power-off and closed state for a long time, and is only opened for short-term use when the scrap steel is released, which has good economy; the finger valve is staggered with the electric furnace to effectively avoid accidents of water leakage into the electric furnace.

[0072] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A continuous shaft scrap steel preheating device, characterized in that: It comprises a shaft structure, a pipe section and a control unit, wherein the shaft structure comprises at least two parallel shafts, each of which is arranged with equal cross-section; a continuous feeding structure is arranged at the top of each shaft, and the two ends of the continuous feeding structure are arranged to be closed or opened; a smoke suction port is arranged at the top of the side wall of each shaft; an electromagnetic brake is arranged on the side wall near the bottom of each shaft, and the bottom of each shaft is connected to the pipe section, and the pipe section is arranged with equal cross-section; a finger valve capable of opening or closing the pipe section is arranged at the bottom of the pipe section; the continuous feeding structure, the electromagnetic brake and the finger valve are all electrically connected to the control unit; A transition inclined pipe is arranged at the bottom of each of the vertical shafts, the bottom of each of the transition inclined pipes is connected to the slide pipe section, and each of the transition inclined pipes is arranged with a uniform cross section; the electromagnetic brake is located above the transition inclined pipe; The continuous feeding structure comprises a silo, a first end of which is connected to each of the vertical shafts via a first valve, and the first valve is electrically connected to the control unit; A transition inclined plate is arranged at the top of each of the vertical shafts.

2. The continuous shaft scrap steel preheating device according to claim 1, characterized in that: The top of the silo is connected to the feeding hopper via a second valve, and the second valve is electrically connected to the control unit.

3. The continuous shaft scrap steel preheating device according to claim 1, characterized in that: The first valve is a gate valve.

4. The continuous shaft scrap steel preheating device according to claim 2, characterized in that: The second valve is a gate valve.

5. The continuous shaft scrap steel preheating device according to claim 2, characterized in that: The diameter of the feeding hopper is gradually reduced from top to bottom.

6. An electric furnace steelmaking equipment, characterized in that: It comprises a feeding device, the continuous vertical shaft scrap steel preheating device as claimed in any one of claims 1 to 5, an electric furnace feeding and conveying structure and an electric furnace, wherein the continuous vertical shaft scrap steel preheating device is located above the electric furnace feeding and conveying structure, the feeding device is used for feeding the continuous vertical shaft scrap steel preheating device, and the electric furnace feeding and conveying structure is used for adding the scrap steel preheated by the continuous vertical shaft scrap steel preheating device into the electric furnace.

7. The electric furnace steelmaking equipment according to claim 6, characterized in that: The finger valve at the bottom of the continuous vertical shaft scrap steel preheating device is staggered with the electric furnace.

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