Electric furnace

Abstract

The invention provides an electric furnace which comprises a furnace tank, the furnace tank comprises a push head assembly and a heating part, the push head assembly is arranged at the top of the furnace tank and provided with a push head part capable of being movably arranged in an inner cavity of the furnace tank in a penetrating mode in the vertical direction, and the heating part is attached to the outer side of the furnace tank in the circumferential direction of the furnace tank; the negative pressure feeding mechanism comprises a feeding structure and a horizontal feeding structure, the feeding structure is provided with a transfer box body, an air extraction assembly capable of extracting air and a feeding pipeline used for conveying smelting materials, and one end of the feeding pipeline and the air extraction assembly are in sealed communication with an inner cavity of the transfer box body; the other end of the feeding pipeline is communicated with an inner cavity of the furnace tank in a sealed mode, a feeding port is formed in the transfer box body, the horizontal feeding structure is provided with a horizontal feeding section capable of conveying smelting materials through vibration, and the horizontal feeding section is connected with the feeding port and communicated with an inner cavity of the transfer box body through the feeding port. The problems that the metal yield of direct reduction iron is low, and the nitrogen content in molten steel is high are solved.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting furnace equipment, and in particular to an electric furnace. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] In the context of energy transformation becoming a global consensus and trend, downstream industries represented by the automotive industry have also put forward urgent demands for low-carbon steel materials, which indicates that it is imperative to develop an electric arc furnace short-process steelmaking process using direct reduced iron (DRI) as raw material. However, there are three technical bottlenecks in this process. First, the density of DRI is less than the density of molten steel, which makes DRI easy to float in the molten pool. When the addition ratio is high, DRI is easy to be discharged from the molten pool with the slag liquid, reducing the metal recovery rate of DRI; second, the arc generated by the electric arc furnace will ionize nitrogen in the air, allowing nitrogen ions to enter the molten steel, resulting in a high nitrogen content in the steel, which is difficult to meet the requirements of high-end steel grades such as automotive plate steel. Therefore, it is urgent to develop a new type of electric furnace to solve the current technical bottleneck problem in order to achieve the goal of smelting high-end "green steel" using DRI as raw material.

[0004] In response to the demand for smelting low-carbon steel materials, the prior art proposes a structure for recycling excess heat. For example, ferrous solid waste and carbon raw materials are mixed to obtain a mixture, and the mixture is smelted in a vertical smelting furnace to obtain a molten liquid. During the smelting process, the heat at the top of the vertical smelting furnace is recycled to the middle of the vertical smelting furnace to preheat the falling ferrous solid waste and carbon raw materials, thereby realizing energy recycling. The hot air and combustion-supporting gas can be sprayed in together to achieve efficient utilization of waste heat and waste energy. Compared with the current process, this method has significant advantages such as near-zero carbon emissions, extreme heat utilization, flexible production methods, small footprint, and low operating costs. However, this method cannot solve the above-mentioned technical bottlenecks. In another prior art (CN220818542U), a smelting and steelmaking integrated electric furnace is provided, comprising a lower furnace body, an upper furnace body, a furnace cover, and an electric furnace. electrode assembly; wherein, a partition wall is arranged in the lower furnace body, and the partition wall divides the lower furnace body into at least two smelting areas side by side; a connecting channel for the circulation of molten metal in adjacent smelting areas is arranged at the bottom of the partition wall, and the partition wall is used to separate the slag liquid and flue gas in adjacent smelting areas; among all the smelting areas, at least one smelting area is used for melting, and at least one smelting area is used for steelmaking, each smelting area is provided with a corresponding upper furnace body, a furnace cover and an electrode assembly, and each smelting area is provided with a feeding device and a dust removal port, and the upper part of the lower furnace body is divided into smelting areas for melting and steelmaking, which reduces the transportation of molten metal, shortens the smelting process, reduces heat loss and environmental pollution in the production process, improves production efficiency, reduces energy consumption, and saves energy. However, this structure only solves the problems of DRI dissolution and slag discharge, and cannot solve the above-mentioned technical bottleneck of high nitrogen content in steel caused by air injection.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0006] The object of the present invention is to provide an electric furnace which solves the problems of low metal recovery rate of direct reduced iron and high nitrogen content in molten steel.

[0007] The above-mentioned implementation objectives of the present invention are mainly achieved by the following technical solutions:

[0008] The present invention provides an electric furnace, comprising:

[0009] A furnace pot, the furnace pot comprising a pusher head assembly and a heating part, the pusher head assembly is arranged on the top of the furnace pot, the pusher head assembly has a pusher head part which can be movably arranged in the inner cavity of the furnace pot in a vertical direction, and the heating part is attached to the outer side of the furnace pot along the circumference of the furnace pot;

[0010] A negative pressure feeding mechanism, the negative pressure feeding mechanism includes a feeding structure and a horizontal feeding structure, the feeding structure has a transfer box, an exhaust component capable of extracting air, and a feeding pipe for conveying smelting material, one end of the feeding pipe and the exhaust component are respectively sealed and connected to the inner cavity of the transfer box, the other end of the feeding pipe is sealed and connected to the inner cavity of the furnace tank, a feeding port is provided on the transfer box, and the horizontal feeding structure has a horizontal feeding section capable of conveying smelting material by vibration, the horizontal feeding section is connected to the feeding port and is connected to the inner cavity of the transfer box through the feeding port.

[0011] In a specific embodiment,

[0012] The horizontal feeding section has a feeding wedge, which is formed at one end of the horizontal feeding section connected to the feeding port, the bottom of the feeding wedge is against the feeding port, and a vibration gap is formed between the top of the feeding wedge and the feeding port to allow the horizontal feeding section to vibrate.

[0013] In a specific embodiment,

[0014] The bottom of the feeding wedge extends from the feed port into the inner cavity of the transfer box to feed the smelting material into the inner cavity of the transfer box. The top of the feeding wedge is located outside the feed port, and the vibration gap is formed between the top of the feeding wedge and the outer wall of the transfer box.

[0015] In a specific embodiment,

[0016] The negative pressure feeding mechanism further comprises a telescopic plate located in the inner cavity of the transfer box, the telescopic plate being movable between a first position and a second position in the vertical direction, the first position being located above the second position;

[0017] Among them, when the telescopic plate is located at the first position, the opposite ends of the telescopic plate are respectively connected to the feeding pipe and the feeding port, so that the smelting material can enter the feeding pipe through the telescopic plate; when the telescopic plate is located at the second position, the telescopic plate and the inner wall of the transfer box form a temporary storage space.

[0018] In a specific embodiment,

[0019] The transfer box body is provided with a discharge port, the feeding pipe is communicated with the inner cavity of the transfer box body through the discharge port, and the height of the discharge port is set lower than the height of the feed port.

[0020] In a specific embodiment,

[0021] The pusher head assembly also includes a hydraulic cylinder and a detachable rod, one end of the detachable rod is connected to the output shaft of the hydraulic cylinder, and the other end of the detachable rod extends into the inner cavity of the furnace pot and is connected to the pusher head portion, and is used to drive the pusher head portion to move or stop in a vertical direction, so that the direct reduced iron floating in the inner cavity of the furnace pot can be pressed down into the molten pool and stopped and maintained.

[0022] In a specific embodiment,

[0023] The detachable rod comprises a first rod and a second rod that are connected to each other, the first rod is connected to the output shaft of the hydraulic cylinder, the second rod is connected to the pushing head, a detachable structure is connected between the first rod and the second rod, the detachable structure has a clamping member and a clamping groove that can be clamped to each other, the clamping member is formed on the first rod, the clamping groove is formed on the second rod, or the clamping member is formed on the second rod, the clamping groove is formed on the first rod.

[0024] In a specific embodiment,

[0025] The pusher head portion is provided with a plurality of liquid passing holes. When the pusher head portion is pressed downward into the molten pool, the solution placed below the pusher head portion can flow into the upper portion of the pusher head portion through the liquid passing holes.

[0026] In a specific embodiment,

[0027] The electric furnace also includes:

[0028] A slag pot, wherein the slag pot has a slag discharge pipe, the slag discharge pipe is connected to the inner cavity of the slag pot, the slag pot is arranged on the outside of the furnace pot, the side wall of the furnace pot is provided with a slag outlet connected to the inner cavity of the furnace pot, the slag outlet is arranged at a limited liquid level height of the furnace pot, and the slag discharge pipe is sealedly connected to the slag outlet so that the slag can enter the inner cavity of the slag pot through the slag discharge pipe.

[0029] In a specific embodiment, the electric furnace further comprises:

[0030] A ladle car assembly, the ladle car assembly comprising a car body for moving on a working surface and a ladle for containing molten steel, the bottom of the furnace pot is provided with a steel outlet which is connected to the inner cavity of the furnace pot and can be opened and closed, the top of the car body is provided with a liquid inlet which is connected to the inner cavity of the car body and can be opened and closed, the liquid inlet is used to dock with the steel outlet, the ladle is arranged in the inner cavity of the car body, and the opening of the ladle is located directly below the liquid inlet.

[0031] In a specific embodiment,

[0032] The ladle car assembly further comprises an inert gas pipeline, which is communicated with the inner cavity of the car body and is used for filling the inner cavity of the car body with inert gas, and the inert gas is preferably argon.

[0033] In a specific embodiment,

[0034] The horizontal feeding structure also has at least two chain conveyors and a vibrator. The vibrator is attached to the horizontal feeding section to drive the horizontal feeding section to vibrate the smelting material into the inner cavity of the transfer box. At least two of the chain conveyors are respectively connected to one end of the horizontal feeding section away from the feed port to add scrap steel and direct reduced iron to the horizontal feeding section respectively.

[0035] In a specific embodiment,

[0036] A peephole is provided on the top of the furnace pot, the peephole is sealed by a transparent material, and a monitor is provided on the top of the peephole for observing the inner cavity of the furnace pot through the peephole.

[0037] In a specific embodiment,

[0038] The electric furnace further comprises a plurality of oxygen lances and a plurality of carbon lances arranged on the side wall of the furnace pot, and the spray outlets of the oxygen lances and the spray outlets of the carbon lances extend into the inner cavity of the furnace pot respectively.

[0039] In a specific embodiment,

[0040] The electric furnace also includes a high-level material pipe arranged on the top of the furnace tank, the high-level material pipe extends in the vertical direction, the discharge port of the high-level material pipe extends into the inner cavity of the furnace tank, the feed port of the high-level material pipe is arranged on the outside of the furnace tank, and a switch valve is provided in the high-level material pipe to block or connect the high-level material pipe.

[0041] Compared with the prior art, the technical solution of the present invention has the following characteristics and advantages:

[0042] 1. The electric furnace provided by the present invention is provided with a pusher head assembly and a pusher head part thereof, which can press the direct reduced iron (DRI) floating on the solution in the furnace pot into the molten pool in the vertical direction, so as to prevent the direct reduced iron from gushing out of the furnace pot along with the slag discharge process of the slag in the furnace pot before it is melted, so that the direct reduced iron (DRI) can be melted in the molten steel, which can effectively improve the metal recovery rate of the electric furnace.

[0043] 2. The electric furnace provided by the present invention can extract the high-temperature flue gas in the furnace tank through the transfer box and the feeding pipeline by setting the negative pressure feeding mechanism, so as to avoid the high-temperature flue gas from gathering in the sealed furnace tank and generating excessive pressure in the furnace tank; at the same time, the electric furnace provided by the present invention can transport the smelting material to the transfer box by connecting the horizontal feeding section with the feeding port of the transfer box, and at the same time, the exhaust assembly connected to the transfer box can also extract the air brought by the horizontal feeding section to avoid air from entering the furnace tank, that is, to avoid the reaction between the smelting molten steel in the furnace tank and the air, resulting in the risk of excessive nitrogen content in the molten steel. In a specific embodiment, a solenoid valve is provided in the feeding pipeline to temporarily close and block the furnace tank during the sealed smelting process of the furnace tank.

[0044] 3. The electric furnace provided by the present invention can avoid the horizontal feeding section being directly connected to the furnace pot by arranging the transfer box with the exhaust assembly in the middle of the furnace pot and the horizontal feeding section, that is, avoiding the risk of a gap inevitably forming between the horizontal feeding section and the furnace pot due to the vibration of the horizontal feeding section. At the same time, the exhaust assembly is located in the middle of the horizontal feeding section and the feeding pipe, so that the exhaust assembly can both extract the high-temperature flue gas in the furnace pot and form a negative pressure in the feeding pipe that flows toward the transfer box, thereby further reducing the probability of air in the horizontal feeding section entering the furnace pot from the feeding pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0046] Figure 1 It is a structural diagram of an electric furnace of the present invention.

[0047] Description of Figure Numbers:

[0048] 100. Furnace pot;

[0049] 110, push head assembly; 111, push head portion; 1111, liquid passage hole;

[0050] 112. Hydraulic cylinder;

[0051] 113. detachable rod; 1131. first rod; 1132. second rod; 1133. detachable structure;

[0052] 120, heating unit;

[0053] 130. Tap hole;

[0054] 140. Peephole; 150. Monitor;

[0055] 160, oxygen gun; 170, carbon gun;

[0056] 180. High-level material pipe; 181. Switch valve;

[0057] 190. Temperature measuring port; 191. Temperature measuring cover;

[0058] 200. Negative pressure feeding mechanism;

[0059] 210. Feeding structure;

[0060] 211, transfer box; 2111, feed port; 2112, discharge port;

[0061] 212. Air extraction assembly;

[0062] 213, feeding pipeline; 2131, solenoid valve;

[0063] 214. Telescopic panels;

[0064] 220, horizontal feeding structure; 221, horizontal feeding section; 2211, feeding wedge; 222, chain conveyor; 223, vibrator;

[0065] 300, slag tank; 310, slag discharge pipe;

[0066] 400, ladle car assembly;

[0067] 410, vehicle body; 411, liquid inlet;

[0068] 420. Ladle; 430. Inert gas pipeline;

[0069] A. Vibration gap. DETAILED DESCRIPTION

[0070] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0071] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0073] like Figure 1 As shown, the present invention provides an electric furnace, comprising:

[0074] The furnace pot 100 includes a pusher head assembly 110 and a heating unit 120. The pusher head assembly 110 is disposed on the top of the furnace pot 100. The pusher head assembly 110 has a pusher head portion 111 that can be moved in a vertical direction and penetrate the inner cavity of the furnace pot 100. The heating unit 120 is attached to the outer side of the furnace pot 100 along the circumference of the furnace pot 100.

[0075] The negative pressure feeding mechanism 200 includes a feeding structure 210 and a horizontal feeding structure 220. The feeding structure 210 has a transfer box 211, an exhaust component 212 capable of extracting air, and a feeding pipe 213 for conveying smelting materials. One end of the feeding pipe 213 and the exhaust component 212 are respectively and sealedly connected to the inner cavity of the transfer box 211, and the other end of the feeding pipe 213 is sealedly connected to the inner cavity of the furnace pot 100. A feeding port 2111 is provided on the transfer box 211. The horizontal feeding structure 220 has a horizontal feeding section 221 capable of conveying smelting materials by vibration. The horizontal feeding section 221 is connected to the feeding port 2111 and is connected to the inner cavity of the transfer box 211 through the feeding port 2111.

[0076] The electric furnace provided by the present invention is provided with a pusher head assembly 110 and a pusher head part 111 thereof, which can press the direct reduced iron (DRI) floating above the molten steel or slag in the furnace pot 100 into the molten pool in the vertical direction so that the direct reduced iron (DRI) can be melted in the molten steel. At the same time, it can also prevent the direct reduced iron from gushing out of the furnace pot 100 during the slag discharge process of the slag in the furnace pot 100 before it is melted, thereby effectively improving the metal recovery rate of the electric furnace.

[0077] The electric furnace provided by the present invention can extract the high-temperature flue gas in the furnace pot 100 through the transfer box 211 and the feeding pipe 213 by setting the negative pressure feeding mechanism 200, so as to avoid the high-temperature flue gas from gathering in the sealed furnace pot 100 and generating excessive pressure in the furnace pot 100; at the same time, the electric furnace provided by the present invention can transport the smelting material to the transfer box 211 by connecting the horizontal feeding section 221 with the feeding port 2111 of the transfer box 211. At the same time, the exhaust component 212 connected to the transfer box 211 can also extract the air brought by the horizontal feeding section 221 to avoid the air from entering the furnace pot 100, that is, to avoid the risk of the smelting molten steel in the furnace pot 100 reacting with the air and causing the nitrogen content of the molten steel to be too high. In a specific embodiment, a solenoid valve 2131 is provided in the feeding pipe 213 to temporarily close and seal the furnace pot 100 during the sealed smelting process of the furnace pot 100 .

[0078] The electric furnace provided by the present invention can avoid the horizontal feeding section 221 being directly connected to the furnace pot 100 by arranging the transfer box 211 with the exhaust component 212 in the middle of the furnace pot 100 and the horizontal feeding section 221, that is, avoid the risk of the inevitable generation of a gap between the horizontal feeding section 221 and the furnace pot 100 due to the vibration of the horizontal feeding section 221. At the same time, the exhaust component 212 is located in the middle of the horizontal feeding section 221 and the feeding pipe 213, so that the exhaust component 212 can both extract the high-temperature flue gas in the furnace pot 100 and form a negative pressure in the feeding pipe 213 that flows in the direction of the transfer box 211, thereby further reducing the probability of the air in the horizontal feeding section 221 entering the furnace pot 100 from the feeding pipe 213.

[0079] Specifically in this embodiment, the furnace pot 100 is generally a cylindrical structure, and the pusher head assembly 110 is arranged on the top of the furnace pot 100. The pusher head assembly 110 is sealed and connected to the furnace pot 100. In a specific embodiment, the pusher head part 111 is located in the inner cavity of the furnace pot 100. The pusher head part 111 is generally formed of a circular plate. The edge of the pusher head part 111 is formed by fitting the inner wall of the furnace pot 100 to press the floating direct reduced iron (DRI) into the furnace pot 100 below the liquid level of the molten steel to the greatest extent, so as to facilitate the melting of the direct reduced iron (DRI) in the molten pool and avoid the direct reduced iron (DRI) from rolling out of the furnace pot 100 with the slag above the molten steel, thereby further improving the metal recovery rate.

[0080] The heating part 120 in this embodiment is generally a heating induction coil for non-arc smelting. In other embodiments, heating can also adopt other structures of other non-arc heating methods. In this embodiment, the heating induction coil of the heating part 120 is arranged around the outer wall of the furnace tank 100; in this embodiment, the heating induction coil is used to increase the temperature of the molten pool to avoid the generation of nitrogen in the arc furnace due to the electrode ionization of the air, thereby also avoiding the problem of excessive nitrogen content in the molten steel.

[0081] In the present embodiment, the negative pressure feeding mechanism 200 mainly forms a negative pressure flow direction toward the exhaust component 212 in both the feeding pipe 213 and the horizontal feeding section 221, so as to prevent air from entering the furnace 100 through the feeding pipe 213; in the present embodiment, the transfer box 211 is generally a cylindrical structure with an inner cavity, and a feeding port 2111 is opened on the top of the transfer box 211, and the feeding port 2111 is connected to the inner cavity of the transfer box 211, and one end of the horizontal feeding section 221 is abutted against the feeding port 2111, so that it can drive the smelting material to vibrate into the inner cavity of the transfer box 211 through vibration. The transfer box 211 can store smelting materials, or a conduction plate can be set in the inner cavity of the transfer box 211, so that the smelting material vibrated into the inner cavity of the transfer box 211 through the feeding port 2111 can directly fall into the feeding pipe 213 through the conduction plate, thereby realizing rapid feeding. In this embodiment, the feeding pipe 213 is sealed and connected between the transfer box 211 and the furnace pot 100 , so as to prevent air from entering the furnace pot 100 from the connection of the feeding pipe 213 .

[0082] like Figure 1 As shown, in one specific embodiment,

[0083] The horizontal feeding section 221 has a feeding wedge 2211, which is formed at one end where the horizontal feeding section 221 is connected to the feeding port 2111. The bottom of the feeding wedge 2211 abuts against the feeding port 2111, and a vibration gap A is formed between the top of the feeding wedge 2211 and the feeding port 2111 for the horizontal feeding section 221 to vibrate.

[0084] This embodiment provides an electric furnace, in which the setting of the feeding wedge 2211 can provide a way for the horizontal feeding section 221 to be connected to the transfer box 211, which can not only reduce the risk of air entering the transfer box 211 from the connection between the horizontal feeding section 221 and the transfer box 211, but also ensure the connection stability between the transfer box 211 and the horizontal feeding section 221.

[0085] Specifically in the present embodiment, the feeding wedge 2211 is generally a wedge-shaped structure, that is, one end of the feeding wedge 2211 is in a pointed shape, the bottom of the feeding wedge 2211 extends and protrudes from the horizontal feeding section 221 toward the transfer box 211, and the top of the feeding wedge 2211 is arranged at a position close to the horizontal feeding section 221 relative to the bottom of the feeding wedge 2211, that is, an inclined surface is formed between the bottom and the top of the feeding wedge 2211, and the bottom of the feeding wedge 2211 is abutted against the bottom of the feeding port 2111 of the transfer box 211, so that the smelting material can stably enter the feeding port 2111 and avoid leakage from the gap between the bottom of the feeding wedge 2211 and the bottom of the feeding port 2111, and a vibration gap A is formed between the top of the feeding wedge 2211 and the feeding port 2111, which can prevent the horizontal feeding section 221 from colliding with the feeding port 2111 during vibration, thereby significantly improving the stability of the structure.

[0086] like Figure 1 As shown, in one specific embodiment,

[0087] The bottom of the feeding wedge 2211 extends from the feed port 2111 into the inner cavity of the transfer box 211 to feed the smelting material into the inner cavity of the transfer box 211. The top of the feeding wedge 2211 is located outside the feed port 2111, and a vibration gap A is formed between the top of the feeding wedge 2211 and the outer wall of the transfer box 211.

[0088] The present embodiment provides an electric furnace, which can facilitate the smelting material to stably enter the feed port 2111 by extending the bottom of the feeding wedge 2211 from the feed port 2111 into the inner cavity of the transfer box 211, thereby avoiding leakage from the gap between the bottom of the feeding wedge 2211 and the bottom of the feed port 2111, and at the same time, the top of the feeding wedge 2211 is arranged on the outside of the feed port 2111, that is, the inclined surface of the feeding wedge 2211 and the top of the feed port 2111 have a certain gap, and at the same time, a vibration gap A is also formed between the feeding wedge 2211 and the outer wall of the transfer box 211, that is, the feeding wedge 2211 can provide a vibration space for the vertical vibration and horizontal vibration of the horizontal feeding section 221, so that the horizontal feeding section 221 can avoid collision with the feed port 2111 during vibration, and can significantly improve the stability of the structure.

[0089] like Figure 1 As shown, in one specific embodiment,

[0090] The negative pressure feeding mechanism 200 further includes a telescopic plate 214 located in the inner cavity of the transfer box 211. The telescopic plate 214 can be moved between a first position and a second position in the vertical direction, and the first position is located above the second position.

[0091] Among them, when the telescopic plate 214 is located in the first position, the opposite ends of the telescopic plate 214 are respectively connected to the feeding pipe 213 and the feeding port 2111, so that the smelting material can enter the feeding pipe 213 through the telescopic plate. When the telescopic plate 214 is located in the second position, the telescopic plate and the inner wall of the transfer box 211 form a temporary storage space.

[0092] The present embodiment provides an electric furnace, in which a telescopic plate 214 is provided for the transfer box 211 to serve as a switching component for switching between two states, wherein when the telescopic plate 214 is located at the first position, it is in a fast feeding state of the transfer box 211, and when the telescopic plate is located at the second position, it is in a temporary storage state of the transfer box 211; by providing the telescopic plate 214, the feeding state can be quickly switched, thereby avoiding the problem of being unable to quickly cut off the feeding due to the slow stopping rhythm of the horizontal feeding section 221 when the feeding needs to be stopped urgently.

[0093] Specifically, in this embodiment, the telescopic plate 214 is generally a plate formed by fitting with the inner wall of the transfer box 211, that is, the smelting materials entering the transfer box 211 from the feed port 2111 all fall on the telescopic plate 214. In this embodiment, the inner cavity of the transfer box 211 is generally cylindrical, and the telescopic plate 214 is generally circular. When the telescopic plate 214 is located at the first position, one end of the telescopic plate 214 docks with the feed port 2111 so that the smelting materials can fall on the telescopic plate 214, and the other end of the telescopic plate 214 is connected to the feeding pipe 213 so that the smelting materials can fall from the telescopic plate 214 into the feeding pipe 213 and be transported to the furnace 100 through the feeding pipe 213. In this embodiment, a hydraulic lifting device is connected to the bottom of the telescopic plate 214, and the telescopic plate 214 is lifted or lowered by the hydraulic lifting device so that the telescopic plate 214 can move between the first position and the second position.

[0094] like Figure 1 As shown, in one specific embodiment,

[0095] The transfer box 211 is provided with a discharge port 2112 , and the feeding pipe 213 is communicated with the inner cavity of the transfer box 211 through the discharge port 2112 . The height of the discharge port 2112 is set lower than the height of the feed port 2111 .

[0096] This embodiment provides an electric furnace, in which the height position of the feed port 2111 is set above the height position of the discharge port 2112, that is, one end of the telescopic plate 214 is high and the other end is low, so that the smelting material entering the furnace pot 100 from the feed port 2111 can slide into the feeding pipe 213 along the inclined surface of the telescopic plate 214, which can significantly improve the feeding speed of the horizontal feeding section 221.

[0097] like Figure 1As shown, in one specific embodiment,

[0098] The pusher head assembly 110 also includes a hydraulic cylinder 112 and a detachable rod 113, one end of the detachable rod 113 is connected to the output shaft of the hydraulic cylinder 112, and the other end of the detachable rod 113 extends into the inner cavity of the furnace pot 100 and is connected to the pusher head 111, and is used to drive the pusher head 111 to move or stop in the vertical direction, so that the direct reduced iron floating in the inner cavity of the furnace pot 100 can be pressed down into the molten pool and stopped and maintained.

[0099] The present embodiment provides an electric furnace, which can push the push head part 111 to move in the inner cavity of the furnace tank 100 along the vertical direction by arranging a hydraulic cylinder 112 and a detachable rod 113. At the same time, the structural design of the hydraulic cylinder 112 can be ensured, and the push head part 111 can remain stopped and fixed when pressed below the liquid surface of the molten pool, so that direct reduced iron (DRI) can be immersed in the molten pool for a long time for melting.

[0100] Specifically in the present embodiment, the hydraulic cylinder 112 is arranged on the outer side of the top of the furnace pot 100 to avoid occupying the inner cavity space of the furnace pot 100, and at the same time, it can also avoid the high temperature in the furnace pot 100 from affecting the structure of the hydraulic cylinder 112. The output shaft of the hydraulic cylinder 112 extends into the inner cavity of the furnace pot 100 through the detachable rod 113 and is connected to the pushing head 111. The detachable rod 113 is movably and sealingly penetrated through the top of the furnace pot 100 to prevent air from entering the furnace pot 100 from the position of the detachable rod 113, which is beneficial to maintaining the sealing of the furnace pot 100.

[0101] In a specific embodiment, the pushing head portion 111 is generally composed of a steel plate with a thickness greater than 8 mm, the detachable rod 113 is vertically welded on the steel plate of the pushing head portion 111, the diameter of the detachable rod 113 is greater than 3 cm and the length is greater than 1 m, the outer surface of the detachable rod 113 and the outer surface of the pushing head portion 111 are both covered with magnesia sand, and before the new detachable rod 113 and the pushing head portion 111 are transferred into the inner cavity of the furnace tank 100, they need to be baked at a temperature above 300°C for more than 10 hours to ensure that the outer layer of magnesia sand is free of moisture.

[0102] like Figure 1 As shown, in one specific embodiment,

[0103] The detachable rod 113 includes a first rod 1131 and a second rod 1132 that are clamped together. The first rod 1131 is connected to the output shaft of the hydraulic cylinder 112, and the second rod 1132 is connected to the pushing head 111. A detachable structure 1133 is connected between the first rod 1131 and the second rod 1132. The detachable structure 1133 has a clamping member and a clamping groove that can be clamped together. The clamping member is formed on the first rod 1131, and the clamping groove is formed on the second rod 1132, or the clamping member is formed on the second rod 1132, and the clamping groove is formed on the first rod 1131.

[0104] This embodiment provides an electric furnace. By setting the first rod 1131 and the second rod 1132, the rod extending out of the furnace tank 100 and the rod extending into the inner cavity of the furnace tank 100 can be disassembled at any time. That is, after the electric furnace is used for a long time, the pushing head 111 and the second rod 1132 extending into the inner cavity of the furnace tank 100 can be disassembled and replaced at the same time, which is convenient for later maintenance.

[0105] The first rod 1131 and the second rod 1132 in this embodiment can be easily disassembled and assembled through the detachable structure 1133 composed of the clamping groove and the clamping member, which can effectively improve the replacement of the electric furnace pushing head 111.

[0106] like Figure 1 As shown, in one specific embodiment,

[0107] The pusher head portion 111 is provided with a plurality of liquid passing holes 1111 . When the pusher head portion 111 is pressed downward into the molten pool, the solution below the pusher head portion 111 can flow into the upper portion of the pusher head portion 111 through the liquid passing holes 1111 .

[0108] The present embodiment provides an electric furnace, which can open a plurality of liquid passing holes 1111, so that when the pusher head 111 moves downward and is pressed into the molten steel, the molten steel and slag located below the pusher head 111 can flow to the upper part of the pusher head 111 through the liquid passing holes 1111, thereby avoiding the situation where the pusher head 111 is blocked from being pressed down due to the incompressible property of the liquid. At the same time, the floating direct reduced iron (DRI) can be pressed into a deeper position in the molten steel, thereby avoiding the direct reduced iron (DRI) and slag being mixed together when pressed into the molten steel at a shallow position, thereby affecting the melting efficiency.

[0109] like Figure 1 As shown, in one specific embodiment,

[0110] The electric furnace also includes:

[0111] The slag pot 300 has a slag discharge pipe 310, which is connected to the inner cavity of the slag pot 300. The slag pot 300 is arranged on the outside of the furnace pot 100. The side wall of the furnace pot 100 is provided with a slag outlet connected to the inner cavity of the furnace pot 100. The slag outlet is arranged at a limited liquid level height of the furnace pot 100. The slag discharge pipe 310 is sealed and connected to the slag outlet so that the slag can enter the inner cavity of the slag pot 300 through the slag discharge pipe 310.

[0112] The present embodiment provides an electric furnace. By setting a slag pot 300 sealed and connected to the furnace pot 100, the slag produced in the furnace pot 100 can be allowed to enter the slag pot 300 through the sealed slag discharge pipe 310, thereby preventing air from entering the furnace pot 100 from the connection between the slag pot 300 and the furnace pot 100 and affecting the nitrogen content of the molten steel in the furnace pot 100. In a specific embodiment, the slag outlet can be set at a limited liquid level height in the inner cavity of the furnace pot 100, so that the slag in the furnace pot 100 can overflow directly from the slag outlet into the slag discharge pipe 310 when rolling and gushing out.

[0113] In this embodiment, the inner wall of the slag discharge pipe 310 can be made of graphite coating material, so that the slag discharge pipe 310 can withstand higher slag temperatures while allowing the slag to slide down smoothly along the slag discharge pipe 310 to avoid being trapped on the slag discharge pipe 310. In a specific embodiment, the slag discharge pipe 310 seals the gap between the slag discharge pipe 310 and the slag outlet with high-temperature refractory mud to prevent air from entering the furnace pot 100 from the slag outlet.

[0114] like Figure 1 As shown, in a specific embodiment, the electric furnace further includes:

[0115] The ladle car assembly 400 includes a car body 410 for moving on a working surface and a ladle 420 for containing molten steel. The bottom of the furnace pot 100 is provided with a steel outlet 130 which is connected to the inner cavity of the furnace pot 100 and can be opened and closed. The top of the car body 410 is provided with a liquid inlet 411 which is connected to the inner cavity of the car body 410 and can be opened and closed. The liquid inlet 411 is used to dock with the steel outlet 130. The ladle 420 is arranged in the inner cavity of the car body 410, and the opening of the ladle 420 is located directly below the liquid inlet 411.

[0116] The present embodiment provides an electric furnace, which can receive the melted and qualified molten steel discharged from the furnace pot 100 by adopting a ladle car assembly 400. Compared with the existing furnace pot 100 in which the molten steel is poured out from the top as a whole, a steel outlet 130 is provided at the bottom of the furnace pot 100, which can discharge qualified molten steel while avoiding the slag floating on the upper layer of the molten steel in the inner cavity of the recovery furnace pot 100, thereby improving the recovery quality of the molten steel. At the same time, the steel outlet 130 is provided at the bottom of the furnace pot 100, which can achieve sealed discharge under the condition of sealed smelting of the furnace pot 100, thereby avoiding the air from entering the inner cavity of the furnace pot 100 from the top of the furnace pot 100 due to opening the cover and reacting with the molten steel, thereby improving the nitrogen content of the molten steel.

[0117] like Figure 1 As shown, in one specific embodiment,

[0118] The ladle car assembly 400 further includes an inert gas pipeline 430 , which is in communication with the inner cavity of the car body 410 and is used to fill the inner cavity of the car body 410 with inert gas, and the inert gas is preferably argon.

[0119] The present embodiment provides an electric furnace. By setting an inert gas pipeline 430, the inner cavity of the car body 410 can be filled with inert gas. That is, when the liquid inlet 411 of the car body 410 and the steel outlet 130 of the furnace pot 100 are connected, the molten steel can directly enter the ladle 420 from the steel outlet 130. At the same time, the inert gas can protect the molten steel from the influence of air, which is beneficial to avoid increasing the nitrogen content of the molten steel. At the same time, the continuous output of the inert gas also makes the inert gas generate pressure to overflow from the liquid inlet 411, so that the inert gas group is shrouded in the vicinity of the steel outlet 130, which can also effectively avoid the increase of the nitrogen content of the molten steel.

[0120] like Figure 1 As shown, in one specific embodiment,

[0121] The horizontal feeding structure 220 also has at least two chain conveyors 222 and a vibrator 223. The vibrator 223 is attached to the horizontal feeding section 221 to drive the horizontal feeding section 221 to vibrate the smelting material into the inner cavity of the transfer box 211. At least two chain conveyors 222 are respectively connected to one end of the horizontal feeding section 221 away from the feed port 2111 to add scrap steel and direct reduced iron to the horizontal feeding section 221 respectively.

[0122] The present embodiment provides an electric furnace, which adopts two chain conveyors 222 to feed materials. During the period of rapid feeding, scrap steel and direct reduced iron (DRI) or other types of raw materials can be fed separately according to a certain feeding ratio, so as to avoid the situation where only one chain conveyor 222 is used, and a certain ratio of raw materials cannot be fed at the same time, which affects the smelting progress of the electric furnace.

[0123] In this embodiment, the vibrator 223 is disposed on the horizontal feeding section 221 . The vibrator 223 can drive the horizontal feeding section 221 to vibrate in the vertical direction and / or horizontal direction through vibration, so as to transport the smelting material into the inner cavity of the transfer box 211 .

[0124] like Figure 1 As shown, in one specific embodiment,

[0125] A peephole 140 is provided on the top of the furnace pot 100 . The peephole 140 is sealed by a transparent material. A monitor 150 is provided on the top of the peephole 140 for observing the inner cavity of the furnace pot 100 through the peephole 140 .

[0126] This embodiment provides an electric furnace, which can effectively improve the monitoring degree of the inner cavity of the furnace pot 100 by setting a peephole 140 and a monitor 150, and better facilitate the operator to adjust the temperature or loading steps at any time according to the smelting progress, and control the push head 111 to move downward to press the direct reduced iron (Direct Reduced Iron, DRI) into the molten steel, which is conducive to improving the smelting efficiency. In another embodiment, the top of the furnace pot 100 is also provided with a temperature measuring port 190, and the temperature measuring port 190 is provided with an openable and closable temperature measuring cover 191, and the temperature measuring port 190 is connected to the inner cavity of the furnace pot 100 to measure the temperature of the inner cavity of the furnace pot 100.

[0127] In a specific embodiment, through the monitor 150 above the peephole 140, if it is found that the melting of direct reduced iron (DRI) in the molten pool forms an iceberg, the pushing head 111 can be moved downward to press the iceberg formed by the direct reduced iron into the molten steel.

[0128] like Figure 1 As shown, in one specific embodiment,

[0129] The electric furnace further includes a plurality of oxygen lances 160 and a plurality of carbon lances 170 disposed on the side wall of the furnace pot 100 , and the spray outlets of the oxygen lances 160 and the spray outlets of the carbon lances 170 extend into the inner cavity of the furnace pot 100 respectively.

[0130] The present embodiment provides an electric furnace, which adopts a carbon gun 170 and an oxygen gun 160, so as to facilitate the operator to reasonably adjust the smelting problems, and to supplement the situation and problem that the heating coil type heating part 120 is not sensitive to the temperature adjustment in the later stage of smelting. In the present embodiment, the carbon gun 170 is a structure capable of spraying carbon powder, and the oxygen gun 160 is a structure capable of spraying oxygen. In the present embodiment, the smelting material is preliminarily melted by the heating part 120. Furthermore, if the carbon content of the scrap steel or direct reduced iron (DRI) is high, the oxygen gun 160 can be used to spray oxygen. If the oxygen is blown excessively, the carbon gun 170 can be opened to spray carbon powder to ensure a higher metal yield.

[0131] like Figure 1 As shown, in one specific embodiment,

[0132] The electric furnace also includes a high-level material pipe 180 arranged on the top of the furnace tank 100. The high-level material pipe 180 extends in the vertical direction. The discharge port 2112 of the high-level material pipe 180 extends into the inner cavity of the furnace tank 100. The feed port 2111 of the high-level material pipe 180 is arranged on the outside of the furnace tank 100. A switch valve 181 is provided in the high-level material pipe 180 to block or connect the high-level material pipe 180.

[0133] This embodiment provides an electric furnace. By setting a high-level material pipe 180, the required smelting materials can be added to the furnace tank 100 at any time, avoiding the problem of difficulty in switching equipment and inability to accurately control the amount of feeding when using the horizontal feeding section 221 for feeding.

[0134] Specifically in the present embodiment, a switch valve 181 is provided in the high-level material pipe 180. When no material is added, the switch valve 181 is closed at any time to ensure that air does not enter the furnace tank 100 from the high-level material pipe 180. In a specific embodiment, required smelting materials such as lime can be added through the high-level material pipe 180.

[0135] In a specific embodiment, based on a 60-ton electric furnace, the specific implementation method and steps of the electric furnace provided by the present invention are as follows:

[0136] Step S1: Open the solenoid valve 2131, connect the feeding pipe 213 to the inner cavity of the furnace tank 100, and raise the telescopic plate 214 to the first position;

[0137] Step S2: Turn on the air extraction component 212, and the air extraction volume of the air extraction component 212 is 1500Nm 3 / h~1800Nm 3 / h;

[0138] Step S3: Turn on the vibrator 223 and the two chain conveyors 222. The chain conveyors 222 convey scrap steel and direct reduced iron (DRI) to the horizontal feeding section 221 at a ratio of 1:1. The horizontal feeding section 221 conveys the smelting material to the inner cavity of the furnace tank 100 through the transfer box 211 and the feeding pipe 213. The feeding speed of the horizontal feeding section 221 is 2.5t / min to 3.5t / min.

[0139] Step S4: Turn on the heating unit 120 to heat the smelting material in the furnace pot 100, open the high-level material pipe 180, and add 500 kg of lime into the furnace pot 100;

[0140] Step S5: Open the oxygen gun 160, and the oxygen flow rate of the oxygen gun 160 is 15Nm 3 / h, oxygen blowing time 3min, to speed up the melting speed of DRI;

[0141] Step S6: Increase the air volume of the air extraction component 212 to 2000 Nm 3 / h~2300Nm 3 / h;

[0142] Step S7: The monitor 150 located above the peephole 140 is turned on to observe the melting of the direct reduced iron (DRI) in the molten pool; when the direct reduced iron produces an "iceberg" phenomenon, the detachable rod 113 pushes the push head 111 to move downward to press the "iceberg" produced by the direct reduced iron into the molten steel, and stays for 10s to 20s. The detachable rod 113 pushes the push head 111 to move upward and reset to the top of the furnace tank 100;

[0143] Step S8: The heating unit 120 continues to heat the smelting material in the furnace pot 100, and the slag generated above the molten steel flows into the slag pot 300 from the slag discharge pipe 310;

[0144] Step S9: turn off the vibrator 223 and the two chain conveyors 222, stop feeding, and at the same time move the telescopic plate 214 down to the second position to form a temporary storage space for receiving the smelting material delivered when the horizontal feeding section 221 is not completely stopped.

[0145] Step S10: After the temperature of the molten steel is qualified, the ladle car assembly 400 moves to the bottom of the steel outlet 130, the liquid inlet 411 is connected to the steel outlet 130, the inert gas pipeline 430 is filled into the inner cavity of the car body 410 with inert gas, the steel outlet 130 is opened, and the molten steel is transported to the inner cavity of the ladle 420;

[0146] Step S11: the steel outlet 130 is closed, and the liquid inlet 411 is closed, and the vehicle body 410 moves along the working surface to transport the molten steel to the external forming working area.

[0147] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric furnace, characterized in that: include: A furnace pot, the furnace pot comprising a pusher head assembly and a heating part, the pusher head assembly is arranged on the top of the furnace pot, the pusher head assembly has a pusher head part which can be movably arranged in the inner cavity of the furnace pot in a vertical direction, and the heating part is attached to the outer side of the furnace pot along the circumference of the furnace pot; A negative pressure feeding mechanism, the negative pressure feeding mechanism includes a feeding structure and a horizontal feeding structure, the feeding structure has a transfer box, an exhaust component capable of extracting air, and a feeding pipe for conveying smelting material, one end of the feeding pipe and the exhaust component are respectively sealed and connected to the inner cavity of the transfer box, the other end of the feeding pipe is sealed and connected to the inner cavity of the furnace tank, a feeding port is provided on the transfer box, and the horizontal feeding structure has a horizontal feeding section capable of conveying smelting material by vibration, the horizontal feeding section is connected to the feeding port and is connected to the inner cavity of the transfer box through the feeding port.

2. The electric furnace according to claim 1, characterized in that: The horizontal feeding section has a feeding wedge, which is formed at one end of the horizontal feeding section connected to the feeding port, the bottom of the feeding wedge is against the feeding port, and a vibration gap is formed between the top of the feeding wedge and the feeding port to allow the horizontal feeding section to vibrate.

3. The electric furnace according to claim 2, characterized in that: The bottom of the feeding wedge extends from the feed port into the inner cavity of the transfer box to feed the smelting material into the inner cavity of the transfer box. The top of the feeding wedge is located outside the feed port, and the vibration gap is formed between the top of the feeding wedge and the outer wall of the transfer box.

4. The electric furnace according to claim 1, characterized in that: The negative pressure feeding mechanism further comprises a telescopic plate located in the inner cavity of the transfer box, the telescopic plate being movable between a first position and a second position in the vertical direction, the first position being located above the second position; Among them, when the telescopic plate is located at the first position, the opposite ends of the telescopic plate are respectively connected to the feeding pipe and the feeding port, so that the smelting material can enter the feeding pipe through the telescopic plate; when the telescopic plate is located at the second position, the telescopic plate and the inner wall of the transfer box form a temporary storage space.

5. The electric furnace according to claim 4, characterized in that: The transfer box body is provided with a discharge port, the feeding pipe is communicated with the inner cavity of the transfer box body through the discharge port, and the height of the discharge port is set lower than the height of the feed port.

6. The electric furnace according to claim 1, characterized in that: The pusher head assembly also includes a hydraulic cylinder and a detachable rod, one end of the detachable rod is connected to the output shaft of the hydraulic cylinder, and the other end of the detachable rod extends into the inner cavity of the furnace pot and is connected to the pusher head portion, and is used to drive the pusher head portion to move or stop in a vertical direction, so that the direct reduced iron floating in the inner cavity of the furnace pot can be pressed down into the molten pool and stopped and maintained.

7. The electric furnace according to claim 6, characterized in that: The detachable rod comprises a first rod and a second rod that are connected to each other, the first rod is connected to the output shaft of the hydraulic cylinder, the second rod is connected to the pushing head, a detachable structure is connected between the first rod and the second rod, the detachable structure has a clamping member and a clamping groove that can be clamped to each other, the clamping member is formed on the first rod, the clamping groove is formed on the second rod, or the clamping member is formed on the second rod, the clamping groove is formed on the first rod.

8. The electric furnace according to claim 6 or 7, characterized in that: The pusher head portion is provided with a plurality of liquid passing holes. When the pusher head portion is pressed downward into the molten pool, the solution placed below the pusher head portion can flow into the upper portion of the pusher head portion through the liquid passing holes.

9. The electric furnace according to claim 1, characterized in that: The electric furnace also includes: A slag pot, wherein the slag pot has a slag discharge pipe, the slag discharge pipe is connected to the inner cavity of the slag pot, the slag pot is arranged on the outside of the furnace pot, the side wall of the furnace pot is provided with a slag outlet connected to the inner cavity of the furnace pot, the slag outlet is arranged at a limited liquid level height of the furnace pot, and the slag discharge pipe is sealedly connected to the slag outlet so that the slag can enter the inner cavity of the slag pot through the slag discharge pipe.

10. The electric furnace according to claim 1, characterized in that The electric furnace also includes: A ladle car assembly, the ladle car assembly comprising a car body for moving on a working surface and a ladle for containing molten steel, the bottom of the furnace pot is provided with a steel outlet which is connected to the inner cavity of the furnace pot and can be opened and closed, the top of the car body is provided with a liquid inlet which is connected to the inner cavity of the car body and can be opened and closed, the liquid inlet is used to dock with the steel outlet, the ladle is arranged in the inner cavity of the car body, and the opening of the ladle is located directly below the liquid inlet.

11. The electric furnace according to claim 10, characterized in that: The ladle car assembly further comprises an inert gas pipeline, which is communicated with the inner cavity of the car body and is used for filling the inner cavity of the car body with inert gas, and the inert gas is preferably argon.

12. The electric furnace according to claim 1, characterized in that: The horizontal feeding structure also has at least two chain conveyors and a vibrator. The vibrator is attached to the horizontal feeding section to drive the horizontal feeding section to vibrate the smelting material into the inner cavity of the transfer box. At least two of the chain conveyors are respectively connected to one end of the horizontal feeding section away from the feed port to add scrap steel and direct reduced iron to the horizontal feeding section respectively.

13. The electric furnace according to claim 1, characterized in that: A peephole is provided on the top of the furnace pot, the peephole is sealed by a transparent material, and a monitor is provided on the top of the peephole for observing the inner cavity of the furnace pot through the peephole.

14. The electric furnace according to claim 1, characterized in that The electric furnace further comprises a plurality of oxygen lances and a plurality of carbon lances arranged on the side wall of the furnace pot, and the spray outlets of the oxygen lances and the spray outlets of the carbon lances extend into the inner cavity of the furnace pot respectively.

15. The electric furnace according to claim 1, characterized in that: The electric furnace also includes a high-level material pipe arranged on the top of the furnace tank, the high-level material pipe extends in the vertical direction, the discharge port of the high-level material pipe extends into the inner cavity of the furnace tank, the feed port of the high-level material pipe is arranged on the outside of the furnace tank, and a switch valve is provided in the high-level material pipe to block or connect the high-level material pipe.

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