Molten steel RH refining device

Abstract

The invention relates to a molten steel RH refining device, and belongs to the technical field of steel smelting, the molten steel RH refining device comprises a steel ladle barrel, a steel ladle cover, a reaction furnace, an inlet pipe, an outlet pipe and an argon pipe, and the top end of the steel ladle barrel is provided with an opening; the steel ladle cover covers the opening of the steel ladle barrel, and a fixing hole and an argon gas hole are formed in the top surface of the steel ladle cover; the reaction furnace is inserted and fixed in the fixing hole; an inlet hole and an outlet hole are formed in the bottom end of the reaction furnace; the inlet pipe is fixedly communicated with the inlet hole, the outlet pipe is fixedly communicated with the outlet hole, and the argon pipe is fixedly inserted into the argon hole. The steel ladle barrel, the inlet pipe, the reaction furnace and the outlet pipe are utilized to form the circulating flow channel, then the argon pipe is utilized to introduce high-pressure argon into the steel ladle barrel, and since the pipe wall of the inlet pipe is provided with the powder spraying holes for spraying the dephosphorization and desulfurization powder, the dephosphorization and desulfurization powder can be sprayed while high-temperature molten steel is pushed by the high-pressure argon to flow in the circulating flow channel; and dephosphorizing and desulfurizing powder is sprayed into the high-temperature molten steel flowing circularly, so that the dephosphorizing and desulfurizing powder is in full contact with the high-temperature molten steel, the reaction is accelerated, the refining time is shortened, the phosphorus and sulfur content is reduced, and the refining quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel smelting, and in particular to a molten steel RH refining device. Background Art

[0002] RH vacuum cycle degassing refining is a key technology for ultra-low carbon steel production. In 1957, Ruhrstahl and Heraeus collaborated to successfully design the world's first industrial RH vacuum degassing equipment. In 1959, this equipment went into operation at ThyssenKrupp's Hennigssee steelworks in Germany, marking the official industrial application of the RH method. The existing RH vacuum refining process performs multiple metallurgical functions, including degassing, deoxidation, decarburization, desulfurization, composition adjustment, and heating.

[0003] As the core device for molten steel refining, RH equipment has undergone continuous technological innovation and functional upgrades since its inception. Its original design goal was primarily to remove hydrogen and non-metallic inclusions from molten steel to improve the purity of the steel. With the continuous advancement of metallurgical technology, the functions of RH refining have gradually expanded, resulting in the development of a variety of advanced vacuum refining processes, such as RH-OB, RH-KTB, RH-IJ, RH-PTB, and RH-MFB. The traditional RH refining process involves dropping bulk slag material from a silo above the vacuum chamber onto the surface of the molten steel by gravity, where it undergoes dephosphorization, desulfurization, and alloying. However, once the bulk material enters the ladle with the molten steel, it quickly floats to the slag layer above the ladle, resulting in extremely low dephosphorization and desulfurization efficiencies and making it difficult to reduce the phosphorus and sulfur contents to the target values ​​required for the specific steel grade.

[0004] Therefore, how to design a molten steel RH refining device with short refining time, good dephosphorization and desulfurization effects and high molten steel purity is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] The present invention provides a molten steel RH refining device, which solves the technical problems of long refining time and poor dephosphorization and desulfurization effects in existing molten steel RH refining equipment.

[0006] The present invention solves the above technical problems with the following technical solutions: a molten steel RH refining device comprising: a ladle barrel, a ladle cover, a reaction furnace, an inlet pipe, an outlet pipe, a powder conveying pipe and an argon pipe.

[0007] The interior of the ladle barrel is filled with high-temperature molten steel and has an opening at its top; the ladle cover sealing cover is arranged at the opening of the ladle barrel and has a fixing hole and an argon hole on its top surface; the middle part of the reactor is sealed and inserted into the fixing hole and has an inlet hole and an outlet hole at its bottom end extending into the ladle barrel; the inlet pipe and the outlet pipe are both located in the ladle barrel, the top end of the inlet pipe is fixed and connected to the inlet hole, the top end of the outlet pipe is fixed and connected to the outlet hole, and the ladle barrel, the inlet pipe, the reactor and A circulation channel is formed between the outlet pipes, and a powder spraying hole for spraying dephosphorization and desulfurization powder is provided on the wall of the inlet pipe; one end of the powder conveying pipe is connected with the external dephosphorization and desulfurization powder spraying gun and the other end thereof passes through the ladle cover and is connected with the powder spraying hole; the upper part of the argon pipe is sealed and inserted into the argon hole and the bottom end thereof extends into the ladle barrel, so that high-pressure argon gas is passed into the ladle barrel through the argon pipe, pushing the high-temperature molten steel to circulate in the circulation channel, so that the dephosphorization and desulfurization powder is fully in contact with the high-temperature molten steel.

[0008] The beneficial effects of the present invention are as follows: the structure of the traditional RH refining equipment for molten steel is improved, a circulation flow channel is first formed by utilizing a ladle barrel, an inlet pipe, a reaction furnace and an outlet pipe, and then high-pressure argon gas is introduced into the ladle barrel through an argon pipe. Since a powder spraying hole for spraying dephosphorization and desulfurization powder is provided on the wall of the inlet pipe, dephosphorization and desulfurization powder can be sprayed into the circulating high-temperature molten steel while the high-pressure argon gas pushes the high-temperature molten steel to flow in the circulation flow channel, so that the dephosphorization and desulfurization powder is fully in contact with the high-temperature molten steel, the chemical reaction between the dephosphorization and desulfurization powder and the high-temperature molten steel is accelerated, the refining time of the molten steel is shortened, the phosphorus and sulfur content of the molten steel is reduced, the refining quality of the molten steel is improved, and efficient smelting is achieved.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, a pressure relief hole is provided on the top surface of the ladle cover, and the pressure relief hole is located on one side of the fixing hole and the argon hole and a pressure relief valve is installed thereon.

[0011] A further beneficial effect of the above method is that when the internal pressure of the reactor and the ladle barrel is too high, the pressure relief valve can be opened to ensure that the pressure in the reactor and the ladle barrel is normal and prevent explosion accidents.

[0012] Furthermore, an exhaust hole is provided on the furnace wall of the reaction furnace, and an exhaust pipe is fixed to and connected to the exhaust hole. A vacuum valve is installed in the exhaust pipe and is connected to an external vacuum pump.

[0013] The above method has the further beneficial effect of extracting the air inside the reactor through the vacuum pipe and the vacuum hole, thereby facilitating the introduction of high-pressure argon into the ladle barrel and promoting the high-temperature molten steel to flow in the circulation channel.

[0014] Furthermore, a feeding hole is provided on the furnace wall of the reaction furnace, the feeding hole is tilted and fixed and connected to a feeding pipe, and a feeding valve is installed in the feeding pipe.

[0015] A further beneficial effect of the above method is that when other alloying elements need to be added to the molten steel, the Gary valve can be opened to add a certain amount of alloying elements into the reactor.

[0016] Furthermore, it also includes an air supply pipe, and a lifting air hole is provided on the pipe wall below the powder injection hole corresponding to the inlet pipe; one end of the air supply pipe is connected to the external inert gas and the other end thereof passes through the ladle cover and is connected to the lifting air hole.

[0017] A further beneficial effect of the above method is that a lifting air hole is set on the pipe wall below the powder spraying pipe corresponding to the air inlet pipe. When inert gas is introduced into the lifting air hole, the inert gas can be used to blow the dephosphorization and desulfurization powder to flow synchronously with the high-temperature molten steel, so that the dephosphorization and desulfurization powder reacts with the high-temperature molten steel in the reactor, removing the phosphorus and sulfur contained in the molten steel, and achieving efficient smelting.

[0018] Furthermore, the inert gas is nitrogen, argon, neon or krypton.

[0019] Furthermore, it also includes a lifting ring, which is fixed on the outside of the ladle barrel.

[0020] A further beneficial effect of the above method is that the lifting ring is fixed to the outside of the ladle barrel, making it easy to use the lifting ring to conveniently move the entire RH refining device.

[0021] Furthermore, the particle diameter of the dephosphorization and desulfurization powder is 0.01 to 0.1 mm.

[0022] Furthermore, the material of the dephosphorization and desulfurization powder is calcium oxide, calcium fluoride or magnesium oxide.

[0023] Furthermore, the ladle barrel is made of high temperature resistant material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall assembly structure of a molten steel RH refining device of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of a molten steel RH refining device of the present invention;

[0026] Figure 3 for Figure 2 A is an enlarged structural diagram;

[0027] Figure 4 This is a schematic diagram of the disassembled structure of a molten steel RH refining device of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 1. Ladle drum, 2. Ladle cover, 21. Fixing hole, 22. Argon hole, 23. Pressure relief hole, 3. Reactor, 4. Inlet pipe, 41. Powder injection hole, 42. Lifting hole, 5. Outlet pipe, 6. Argon pipe, 7. Powder conveying pipe, 8. Exhaust pipe, 9. Feeding pipe, 10. Gas pipe, 11. Lifting ring. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2 As shown, a molten steel RH refining device includes: a ladle barrel 1, a ladle cover 2, a reaction furnace 3, an inlet pipe 4, an outlet pipe 5, a powder conveying pipe 7 and an argon gas pipe 6.

[0032] The interior of the ladle barrel 1 is filled with high-temperature molten steel and has an opening at its top; the ladle cover 2 is sealed at the opening of the ladle barrel 1 and has a fixing hole 21 and an argon hole 22 on its top surface; the middle part of the reaction furnace 3 is sealed and inserted into the fixing hole 21 and its bottom end extending into the ladle barrel 1 is provided with an inlet hole and an outlet hole; the inlet pipe 4 and the outlet pipe 5 are both located in the ladle barrel 1, the top of the inlet pipe 4 is fixed and connected to the inlet hole, the top of the outlet pipe 5 is fixed and connected to the outlet hole, and the ladle barrel 1, the inlet pipe 4, the reaction furnace 3 and A circulation channel is formed between the outlet pipes 5, and a powder spraying hole 41 for spraying dephosphorization and desulfurization powder is provided on the wall of the inlet pipe 4; one end of the powder conveying pipe 7 is connected with the external dephosphorization and desulfurization powder spraying gun and the other end thereof passes through the ladle cover 2 and is connected with the powder spraying hole 41; the upper part of the argon pipe 6 is sealed and inserted into the argon hole 22 and the bottom end thereof extends into the ladle barrel 1, so that high-pressure argon gas is passed into the ladle barrel 1 through the argon pipe 6, pushing the high-temperature molten steel to circulate in the circulation channel, so that the dephosphorization and desulfurization powder is in full contact with the high-temperature molten steel.

[0033] In some specific embodiments, a pressure relief hole 23 may be provided on the top surface of the ladle cover 2 . The pressure relief hole 23 is located on one side of the fixing hole 21 and the argon hole 22 and a pressure relief valve is installed thereon.

[0034] In some specific embodiments, an exhaust hole may be provided on the furnace wall of the reaction furnace 3 , and an exhaust pipe 8 is fixed to and connected to the exhaust hole. A vacuum valve is installed in the exhaust pipe 8 and is connected to an external vacuum pump.

[0035] In some specific embodiments, a feeding hole may be provided on the furnace wall of the reaction furnace 3 , and the feeding hole is fixed at an angle and connected to a feeding pipe 9 , in which a feeding valve is installed.

[0036] In some specific embodiments, an air supply pipe 10 may also be included, and a lifting air hole 42 is provided on the pipe wall below the powder injection hole 41 corresponding to the inlet pipe 4; one end of the air supply pipe 10 is connected to the external inert gas and the other end thereof passes through the ladle cover 2 and is connected to the lifting air hole 42.

[0037] Specifically, the inert gas is nitrogen, argon, neon or krypton.

[0038] like Figure 1 and Figure 4 As shown, in some specific embodiments, a lifting ring 11 may be further included, and the lifting ring 11 is sleeved and fixed on the outside of the ladle barrel 1.

[0039] Specifically, the particle diameter of the dephosphorization and desulfurization powder may be 0.01 to 0.1 mm.

[0040] Specifically, the material of the dephosphorization and desulfurization powder is calcium oxide, calcium fluoride or magnesium oxide.

[0041] Specifically, the ladle barrel 1 is made of high temperature resistant material.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, 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. A molten steel RH refining device, characterized in that: include: A ladle barrel (1), wherein the ladle barrel (1) contains high-temperature molten steel and has an opening at the top thereof; A ladle cover (2), wherein a sealing cover of the ladle cover (2) is arranged at the opening of the ladle barrel (1) and a fixing hole (21) and an argon hole (22) are provided on the top surface thereof; A reaction furnace (3), wherein the middle portion of the reaction furnace (3) is sealed and inserted into the fixing hole (21), and the bottom end thereof extending into the ladle barrel (1) is provided with an inlet hole and an outlet hole; An inlet pipe (4), an outlet pipe (5) and a powder conveying pipe (7), wherein the inlet pipe (4) and the outlet pipe (5) are both located in the ladle barrel (1), the top end of the inlet pipe (4) is fixed and connected to the inlet hole, the top end of the outlet pipe (5) is fixed and connected to the outlet hole, and a circulation channel is formed between the ladle barrel (1), the inlet pipe (4), the reaction furnace (3) and the outlet pipe (5), and a powder spraying hole (41) for spraying dephosphorization and desulfurization powder is provided on the pipe wall of the inlet pipe (4); one end of the powder conveying pipe (7) is connected to an external dephosphorization and desulfurization powder spraying gun and the other end thereof passes through the ladle cover (2) and is connected to the powder spraying hole (41); An argon tube (6), the upper portion of which is sealed and inserted into the argon hole (22) and the bottom end of which extends into the ladle barrel (1), so as to pass high-pressure argon gas into the ladle barrel (1) through the argon tube (6), thereby pushing the high-temperature molten steel to circulate in the circulation channel, so that the dephosphorization and desulfurization powder is fully in contact with the high-temperature molten steel.

2. A molten steel RH refining device according to claim 1, characterized in that: A pressure relief hole (23) is provided on the top surface of the ladle cover (2). The pressure relief hole (23) is located on one side of the fixing hole (21) and the argon hole (22) and a pressure relief valve is installed on the pressure relief hole.

3. A molten steel RH refining device according to claim 1, characterized in that: An exhaust hole is provided on the furnace wall of the reaction furnace (3), and an exhaust pipe (8) is fixed to and connected to the exhaust hole. A vacuum valve is installed in the exhaust pipe (8) and is connected to an external vacuum pump.

4. A molten steel RH refining device according to claim 1, characterized in that: A feeding hole is provided on the furnace wall of the reaction furnace (3), the feeding hole is tilted and fixed and is connected to a feeding pipe (9), and a feeding valve is installed in the feeding pipe (9).

5. The RH refining device for molten steel according to claim 1, characterized in that: It also includes an air delivery pipe (10), and a lifting air hole (42) is provided on the pipe wall of the inlet pipe (4) corresponding to the bottom of the powder injection hole (41); one end of the air delivery pipe (10) is connected to the external inert gas and the other end thereof passes through the ladle cover (2) and is connected to the lifting air hole (42).

6. A molten steel RH refining device according to claim 5, characterized in that: The inert gas is nitrogen, argon, neon or krypton.

7. The molten steel RH refining device according to claim 1, characterized in that: It also includes a lifting ring (11), which is sleeved and fixed outside the ladle barrel (1).

8. The molten steel RH refining device according to claim 1, characterized in that: The particle diameter of the dephosphorization and desulfurization powder is 0.01 to 0.1 mm.

9. The molten steel RH refining device according to claim 1, characterized in that: The material of the dephosphorization and desulfurization powder is calcium oxide, calcium fluoride or magnesium oxide.

10. The molten steel RH refining device according to claim 1, characterized in that: The ladle barrel (1) is made of high temperature resistant material.

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