Nitrogen pre-breaking device for molten steel smelting in vacuum furnace production process

Abstract

The utility model discloses a molten steel smelting nitrogen pre -breaking empty device in vacuum furnace production process, the utility model relates to steelmaking technical field, including ladle subassembly, the ladle subassembly top is equipped with vacuum furnace subassembly, the vacuum furnace subassembly includes furnace body, one side of furnace body top is equipped with vacuum interface, and one side fixed mounting of furnace body top is equipped with electronic governing valve, the one side intercommunication of electronic governing valve is equipped with breaking empty interface, breaking empty interface sets up in furnace body outside, the circulation of furnace body bottom is equipped with department, and the circulation is arranged in the inside of ladle subassembly top end, first liquid level sensor fixed mounting of circulation top one end, first liquid level sensor is towards ladle subassembly, the inside top fixed mounting of furnace body has second liquid level sensor, the utility model discloses, can effectively avoid molten steel flow rate too fast from ladle overflow when nitrogen breaking empty, avoid the equipment burnout or the occurrence of safety accident, has higher practical value.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking technology, specifically to a nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process. Background Technology

[0002] Iron and steel smelting and alloy smelting are the core areas of the metallurgical industry, covering the process from refining iron from iron ore and making steel, to manufacturing high-performance alloy materials by adding alloying elements. A vacuum furnace is a device that performs heating treatment in a highly controlled vacuum environment. By removing air and other gases, a vacuum furnace can prevent materials from reacting with oxygen at high temperatures, thereby avoiding problems such as oxidation and decarburization, and can achieve a cleaner processing environment.

[0003] Based on the above, the inventors have discovered the following problems: In the current vacuum furnace production process, when the molten steel is smelted and the vacuum chamber is repressurized, the nitrogen venting valve needs to be opened in advance to pre-ventilate the vacuum chamber with protective nitrogen gas. Because the nitrogen pressure is high, the vacuum level will rise rapidly the moment the nitrogen valve is opened, and the molten steel will quickly flow back from the vacuum chamber to the ladle. However, when the ladle is filled with too much molten steel, the molten steel will overflow due to the excessively fast repressurization speed and the ladle falling too fast to keep up with the molten steel return speed, resulting in equipment burnout or safety accidents.

[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings, and provide a nitrogen pre-ventilation device for steel smelting in vacuum furnace production process, in order to achieve a more practical purpose. Utility Model Content

[0005] The purpose of this invention is to provide a nitrogen pre-ventilation device for steelmaking in vacuum furnace production, so as to solve the problems mentioned in the background art.

[0006] A nitrogen pre-venting device for molten steel production in a vacuum furnace includes a ladle assembly. A vacuum furnace assembly is located on top of the ladle assembly. The vacuum furnace assembly includes a furnace body. A vacuum interface is located on one side of the top of the furnace body, and an electronic regulating valve is fixedly installed on the other side of the top of the furnace body. One side of the electronic regulating valve is connected to a venting interface, which is located on the outside of the furnace body. A circulation section is located at the bottom of the furnace body, inside the top of the ladle assembly. A first liquid level sensor is fixedly installed at one top end of the circulation section, facing the ladle assembly. A second liquid level sensor is fixedly installed at the top of the inner side of the furnace body.

[0007] By adopting the above technical solution, the ladle assembly facilitates the storage and transportation of high-temperature molten steel; the vacuum furnace assembly facilitates the processing of molten steel under vacuum conditions, removing gases and other impurities to improve steel quality; the furnace body facilitates degassing of the molten steel inside; the vacuum interface facilitates connection to an external vacuum device to evacuate the furnace body to a vacuum state; and a venting interface connected to one side of the electronic regulating valve facilitates connection between an external protective gas source and the venting interface, allowing the electronic regulating valve to control the entry of protective gas into the furnace body for venting; and the circulation section facilitates the circulation of molten steel within the ladle assembly. The molten steel is introduced into the vacuum furnace assembly for vacuum degassing. A first level sensor is positioned towards the ladle assembly to monitor the molten steel level inside the ladle assembly. A second level sensor is also installed to monitor the molten steel level inside the furnace. The first and second level sensors, along with the electronic regulating valve, are electrically connected to an external control device. When the molten steel smelting process is completed and the vacuum is broken and pressure is restored, the external control device controls the electronic regulating valve based on the molten steel levels monitored by the first and second level sensors inside the furnace and ladle assembly. This slows down the molten steel backflow rate and effectively prevents the molten steel from overflowing due to excessive backflow.

[0008] Furthermore, a downcomer is provided at one end of the bottom of the circulation section, and an upcomer is provided at the other end of the bottom of the circulation section.

[0009] By adopting the above technical solution, the setting of the downcomer and the riser facilitates the molten steel inside the ladle assembly to enter the furnace body for degassing through the riser, and the degassed molten steel flows back into the ladle assembly through the downcomer.

[0010] Furthermore, one end of the circulation section is provided with an air supply pipe, and one end of the air supply pipe is located inside the riser pipe.

[0011] By adopting the above technical solution, one end of the gas supply pipe is set inside the riser pipe, which facilitates the transmission of inert gas into the riser pipe. The inert gas forms bubbles that carry molten steel from the riser pipe into the furnace body, promoting steel stirring and accelerating the degassing reaction.

[0012] Furthermore, the other end of the gas supply pipe is provided with an air inlet, which is located on the outside of the circulation section.

[0013] By adopting the above technical solution, the air intake interface is set up to facilitate connection between the air intake interface and the external air source, and to facilitate the introduction of inert gas into the riser pipe.

[0014] Furthermore, the ladle assembly includes a housing, and a hanging lug is fixedly installed on the outer side of the housing.

[0015] By adopting the above technical solution, the outer shell can easily accommodate high-temperature molten steel and withstand its high temperature and weight.

[0016] Furthermore, an inner lining is fixedly installed inside the outer shell, and the inner lining is made of magnesium carbon brick.

[0017] By adopting the above technical solution, and using magnesia-carbon bricks as the lining material, the outer shell is easily protected from corrosion by high-temperature molten steel, and the temperature of the molten steel is maintained, which helps to extend the service life of the ladle and reduce heat loss.

[0018] Furthermore, a breathable brick is fixedly installed at one end of the inner lining, and a gas flow controller is fixedly installed at the bottom of the breathable brick.

[0019] By adopting the above technical solution, a gas flow controller is fixedly installed at the bottom of the permeable brick, which facilitates the connection of the permeable brick to an external inert gas source. This allows the inert gas to enter the ladle assembly, promotes uniform mixing inside the molten steel, helps remove inclusions and gases, and improves the purity of the molten steel.

[0020] Furthermore, a sliding gate is fixedly installed at the other end of the inner substrate, and an emergency shut-off device is fixedly installed at the bottom of the sliding gate.

[0021] By adopting the above technical solution, an emergency shut-off device is fixedly installed at the bottom of the sliding gate, which facilitates the outflow of molten steel from inside the ladle assembly. The sliding gate can precisely control the speed and flow rate of the molten steel. The emergency shut-off device can quickly cut off the flow of molten steel in case of abnormality, ensuring the safety of personnel and equipment.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: the ladle assembly facilitates the storage and transportation of high-temperature molten steel; the vacuum furnace assembly facilitates the processing of molten steel under vacuum conditions, removing gases and other impurities to improve steel quality; the furnace body facilitates degassing of the molten steel inside; the vacuum interface facilitates connection to an external vacuum device to evacuate the furnace body to a vacuum state; a venting interface connected to one side of the electronic regulating valve facilitates connection between an external protective gas source and the venting interface, allowing the electronic regulating valve to control the entry of protective gas into the furnace body for venting; and the circulation section facilitates the introduction of molten steel from the ladle assembly into the vacuum furnace assembly for vacuum degassing. The liquid level sensor faces the ladle assembly, facilitating the monitoring of the molten steel level inside the ladle assembly by the first liquid level sensor. The second liquid level sensor facilitates monitoring of the molten steel level inside the furnace. The first and second liquid level sensors, along with the electronic regulating valve, are electrically connected to an external control device. When the molten steel smelting process is completed and the pressure is restored, the external control device controls the electronic regulating valve based on the molten steel levels monitored by the first and second liquid level sensors inside the furnace and ladle assembly. This slows down the molten steel backflow rate, effectively preventing overflow due to excessive backflow. This invention effectively prevents excessively fast molten steel flow from overflowing from the ladle during nitrogen venting, avoiding equipment burnout or safety accidents, and has high practical value. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process of this utility model;

[0024] Figure 2 This is a front view of the vacuum furnace assembly of this utility model;

[0025] Figure 3 This is a cross-sectional view of the vacuum furnace assembly of this utility model;

[0026] Figure 4 This is a cross-sectional view of the steel ladle assembly of this utility model.

[0027] In the diagram: 1. Steel ladle assembly; 11. Outer shell; 12. Hanging lug; 13. Lining; 14. Permeable brick; 15. Sliding nozzle; 16. Gas flow controller; 17. Emergency shut-off device; 2. Vacuum furnace assembly; 201. Furnace body; 202. Vacuum interface; 203. Electronic regulating valve; 204. Air venting interface; 205. Circulation section; 206. First liquid level sensor; 207. Air inlet interface; 208. Second liquid level sensor; 209. Downcomer; 210. Ascendant; 211. Gas delivery pipe. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-4 This utility model provides a technical solution: a nitrogen pre-venting device for molten steel smelting in a vacuum furnace production process, comprising a ladle assembly 1. The ladle assembly 1 facilitates the storage and transportation of high-temperature molten steel. A vacuum furnace assembly 2 is located on top of the ladle assembly 1. The vacuum furnace assembly 2 facilitates the treatment of molten steel under vacuum conditions, removing gases and other impurities to improve steel quality. The vacuum furnace assembly 2 includes a furnace body 201. The furnace body 201 facilitates degassing of molten steel within the furnace body 201. A vacuum interface is located on one side of the top of the furnace body 201. 202. The vacuum interface 202 facilitates connection to an external vacuum device to evacuate the interior of the furnace body 201 to a vacuum state. An electronic regulating valve 203 is fixedly installed on the other side of the top of the furnace body 201. One side of the electronic regulating valve 203 is connected to a venting interface 204, which facilitates connection between an external protective gas source and the venting interface 204. The electronic regulating valve 203 controls the entry of protective gas into the furnace body 201 for venting. The venting interface 204 is located on the outside of the furnace body 201. A venting interface 204 is located at the bottom of the furnace body 201. A circulation section 205 is provided to facilitate the introduction of molten steel from the ladle assembly 1 into the vacuum furnace assembly 2 for vacuum degassing. The circulation section 205 is located on the inner top of the ladle assembly 1, and a first liquid level sensor 206 is fixedly installed at one end of the top of the circulation section 205, facing the ladle assembly 1. This allows the first liquid level sensor 206 to monitor the molten steel level inside the ladle assembly 1. A second liquid level sensor is fixedly installed at the top inner side of the furnace body 201. The device 208, through the setting of the second liquid level sensor 208, facilitates the monitoring of the molten steel level inside the furnace body 201. The first liquid level sensor 206, the second liquid level sensor 208, and the electronic regulating valve 203 are electrically connected to the external control device. When the molten steel smelting is completed and the pressure is restored, the external control device controls the electronic regulating valve 203 according to the molten steel level inside the furnace body 201 and the ladle assembly 1 monitored by the first liquid level sensor 206 and the second liquid level sensor 208, so as to slow down the molten steel backflow speed and effectively prevent the molten steel from overflowing due to the excessive backflow speed.

[0030] The circulation section 205 has a downcomer pipe 209 at one end of its bottom and an upcomer pipe 210 at the other end of its bottom. The downcomer pipe 209 and the upcomer pipe 210 facilitate the molten steel inside the ladle assembly 1 to enter the furnace body 201 for degassing through the upcomer pipe 210. After degassing, the molten steel flows back to the ladle assembly 1 through the downcomer pipe 209.

[0031] The circulation section 205 has a gas supply pipe 211 inside one end, which is located inside the riser pipe 210. This allows for the transmission of inert gas into the riser pipe 210, where the inert gas forms bubbles that carry molten steel from the riser pipe 210 into the furnace body 201, promoting steel agitation and accelerating the degassing reaction. The other end of the gas supply pipe 211 has an inlet port 207 located outside the circulation section 205. This inlet port 207 facilitates connection to an external gas source, allowing for the introduction of inert gas into the riser pipe 210.

[0032] The ladle assembly 1 includes a shell 11, on the outside of which a hanging lug 12 is fixedly installed. The shell 11 is designed to accommodate high-temperature molten steel and withstand its high temperature and weight.

[0033] The outer shell 11 is fixedly installed with an inner liner 13. The material of the inner liner 13 is magnesia-carbon brick. The material of the inner liner 13 is magnesia-carbon brick, which helps to protect the outer shell 11 from the corrosion of high-temperature molten steel and maintain the temperature of the molten steel, which helps to extend the service life of the ladle and reduce heat loss.

[0034] Among them, a permeable brick 14 is fixedly installed at one end of the bottom of the inner lining 13, and a gas flow controller 16 is fixedly installed at the bottom of the permeable brick 14. The gas flow controller 16 fixedly installed at the bottom of the permeable brick 14 facilitates the connection of the permeable brick 14 to an external inert gas source, which facilitates the entry of inert gas into the ladle assembly 1, promotes uniform mixing inside the molten steel, helps to remove inclusions and gases, and improves the purity of the molten steel.

[0035] Among them, a sliding gate 15 is fixedly installed at the other end of the bottom of the inner lining 13, and an emergency shut-off device 17 is fixedly installed at the bottom of the sliding gate 15. The emergency shut-off device 17 installed at the bottom of the sliding gate 15 facilitates the outflow of molten steel from the ladle assembly 1 through the sliding gate 15. The sliding gate 15 can precisely control the speed and flow rate of the molten steel. The emergency shut-off device 17 can quickly cut off the flow of molten steel in case of abnormality, ensuring the safety of personnel and equipment.

[0036] Specifically, the working principle of the nitrogen pre-ventilation device for steel smelting in this type of vacuum furnace production process is as follows: During use, the outer shell 11 facilitates the containment of high-temperature molten steel, bearing its high temperature and weight. The inner lining 13, made of magnesia-carbon brick, protects the outer shell 11 from corrosion by the high-temperature molten steel and maintains the steel temperature, thus extending the ladle's service life and reducing heat loss. A gas flow controller 16 is fixedly installed at the bottom of the permeable brick 14, allowing the permeable brick 14 to connect to an external inert gas source. This facilitates the entry of inert gas into the ladle assembly 1, promoting uniform mixing within the molten steel, helping to remove inclusions and gases, and improving the purity of the molten steel. The vacuum interface 202 facilitates... An external vacuum device is connected to evacuate the furnace body 201 to a vacuum state. An air-breaking interface 204 is connected to one side of an electronic regulating valve 203, facilitating connection between an external protective gas source and the air-breaking interface 204. The electronic regulating valve 203 controls the entry of protective gas into the furnace body 201 for air-breaking. The circulation unit 205 facilitates the introduction of molten steel from the ladle assembly 1 into the vacuum furnace assembly 2 for vacuum degassing. A first liquid level sensor 206 is positioned towards the ladle assembly 1 to monitor the molten steel level inside the ladle assembly 1. A second liquid level sensor 208 is also provided to monitor the molten steel level inside the furnace body 201. 206. The second liquid level sensor 208 and the electronic regulating valve 203 are electrically connected to the external control device. When the molten steel smelting is completed and the pressure is restored, the external control device controls the electronic regulating valve 203 based on the molten steel level height inside the furnace body 201 and the ladle assembly 1 monitored by the first liquid level sensor 206 and the second liquid level sensor 208. This slows down the molten steel backflow speed, effectively preventing the molten steel from overflowing due to excessive backflow. The downcomer 209 and the riser 210 facilitate the molten steel inside the ladle assembly 1 to enter the furnace body 201 for degassing through the riser 210. After degassing, the molten steel flows back into the ladle assembly 1 through the downcomer 209 and is then transported through the gas pipe 211, with one end set at the riser. Inside pipe 210, inert gas is introduced into riser pipe 210 via gas supply pipe 211. The inert gas forms bubbles that carry molten steel from riser pipe 210 into furnace body 201, promoting steel agitation and accelerating degassing reaction. The gas inlet 207 facilitates connection with an external gas source, allowing inert gas to be introduced into riser pipe 210. An emergency shut-off device 17 is fixedly installed at the bottom of sliding nozzle 15, allowing molten steel inside ladle assembly 1 to flow out through sliding nozzle 15. Sliding nozzle 15 can precisely control the speed and flow rate of molten steel. Emergency shut-off device 17 can quickly cut off the flow of molten steel in case of abnormality, ensuring the safety of personnel and equipment.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A nitrogen pre-ventilation device for steelmaking in a vacuum furnace, characterized in that, The system includes a ladle assembly (1), a vacuum furnace assembly (2) on top of the ladle assembly (1), a furnace body (201) on the vacuum furnace assembly (2), a vacuum interface (202) on one side of the top of the furnace body (201), and an electronic regulating valve (203) fixedly installed on the other side of the top of the furnace body (201). A venting interface (204) is connected to one side of the electronic regulating valve (203). The venting interface (204) is located on the outside of the furnace body (201). A circulation part (205) is provided at the bottom of the furnace body (201). The circulation part (205) is located on the inside of the top of the ladle assembly (1). A first liquid level sensor (206) is fixedly installed at one end of the top of the circulation part (205). The first liquid level sensor (206) faces the ladle assembly (1). A second liquid level sensor (208) is fixedly installed at the top of the inside of the furnace body (201).

2. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 1, characterized in that, The bottom end of the circulation section (205) is provided with a downcomer (209), and the other end of the bottom of the circulation section (205) is provided with an upcomer (210).

3. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 2, characterized in that, The circulation section (205) has an internal gas supply pipe (211) at one end, and the gas supply pipe (211) is located inside the riser pipe (210) at the other end.

4. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 3, characterized in that, The other end of the gas supply pipe (211) is provided with an air inlet (207), which is located outside the circulation section (205).

5. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 1, characterized in that, The steel ladle assembly (1) includes a housing (11), and a hanging lug (12) is fixedly installed on the outside of the housing (11).

6. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 5, characterized in that, The outer shell (11) is fixedly installed with an inner lining (13), which is made of magnesium carbon brick.

7. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 6, characterized in that, A breathable brick (14) is fixedly installed at one bottom end of the lining (13), and a gas flow controller (16) is fixedly installed at the bottom of the breathable brick (14).

8. The nitrogen pre-ventilation device for steelmaking in the vacuum furnace production process according to claim 7, characterized in that, A sliding water inlet (15) is fixedly installed at the other end of the bottom of the liner (13), and an emergency closing device (17) is fixedly installed at the bottom of the sliding water inlet (15).

Images