Spray gun for RH refining

Abstract

The utility model relates to a spray gun for RH (Ruhrstahl Heraeus) refining, which is characterized in that a powder injection pipe is positioned inside a composite gas injection pipe, and a plurality of gas guide lines are fixed on the inner wall of the composite gas pipe; during injection, the powder and the composite gas are sprayed out synchronously, the powder located in the middle of the powder injection pipe can be protected by the spirally sprayed composite gas, cannot be sucked away by vacuum degassing equipment and can be gathered together to be injected into molten steel, the use efficiency of the powder is improved, and the problem that in the prior art, in the vacuum refining process, the powder cannot be sucked away by the vacuum degassing equipment is solved. The technical problems that the flow of gas or powder of a steel-making spray gun is often difficult to control, part of powder is sucked away by degassing equipment of an RH vacuum chamber, waste is caused, the refining effect is unstable, and refined molten steel cannot meet the process requirement are solved.

Description

Technical Field

[0001] The embodiment of the utility model relates to a spray gun for steelmaking, in particular to a spray gun for RH refining. Background Art

[0002] The steelmaking spray gun is one of the core equipment of RH refining. It sprays oxygen, fuel gas, inert gas or their mixed gases into the molten steel at high speed through the nozzle. At the same time, it can also spray various powders such as deoxidizer, desulfurizer, alloying agent, etc. to achieve refining effects such as stirring, dehydrogenation, deoxidation, decarburization, and desulfurization of the molten steel. In addition, the steelmaking spray gun can also adjust the temperature and composition of the molten steel by controlling the flow rate and pressure of the sprayed gas, and further optimize the mechanical properties and processing properties of the steel. However, in the prior art, during the vacuum refining process, the gas or powder flow control of the steelmaking spray gun is often difficult to control, and part of the powder will be sucked away by the degassing equipment of the RH vacuum chamber, which causes waste and leads to unstable refining effect, and the refined molten steel cannot meet the process requirements. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide a RH refining spray gun in which powder is not sucked away by a degassing device in a RH vacuum chamber.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model designs a RH refining spray gun, comprising:

[0005] Powder blowing tube;

[0006] A composite gas blowing pipe, wherein the powder blowing pipe is located inside the composite gas blowing pipe,

[0007] Gas guide lines, a plurality of gas guide lines are fixed on the inner wall of the composite gas pipe; during spraying, the powder and the composite gas are sprayed out synchronously.

[0008] Furthermore, in the RH refining spray gun of the utility model, 6 to 12 gas guide lines are arranged on the inner wall of the composite gas blowing pipe.

[0009] Furthermore, in the RH refining spray gun of the utility model, a plurality of the gas guide lines are arranged in a spiral and parallel manner around the inner wall of the composite gas blowing pipe.

[0010] Furthermore, in the RH refining spray gun of the utility model, the inclination angle of the gas guide line is 30°-45°.

[0011] Furthermore, in the RH refining spray gun of the utility model, the intervals between the plurality of gas flow guide lines are consistent, rotationally symmetrical, and the rotation angles and directions are consistent.

[0012] Furthermore, in the RH refining spray gun of the present invention, the materials of the powder spray pipe, the composite gas spray pipe and the gas guide line are all high-temperature ceramics.

[0013] Compared with the prior art, the implementation method of the utility model adopts a method in which the powder blowing pipe is located inside the composite gas blowing pipe, and a plurality of gas guide lines are fixed on the inner wall of the composite gas pipe; during blowing, the powder and the composite gas are sprayed synchronously, and the powder located in the middle of the powder blowing pipe can be protected by the spirally sprayed composite gas and will not be sucked away by the vacuum degassing equipment, but will be gathered together and sprayed into the molten steel, thereby improving the use efficiency of the powder.

[0014] The advantages of the utility model are:

[0015] (1) When the RH refining spray gun of the utility model is used for spraying, the gas sprayed from the composite gas pipe will spirally wrap the powder to protect it from being sucked away by the vacuum degassing equipment, thereby achieving precise composition control and obtaining high-quality steel grades.

[0016] (2) The composite gas can be composed of a variety of gases such as oxygen, fuel gas, inert gas, etc., and a variety of refining effects such as oxygen blowing, heating, stirring, etc. can be selected according to needs.

[0017] (3) Spraying powder and composite gas simultaneously can shorten the refining cycle and further improve the efficiency of RH refining.

[0018] The invention solves the technical problem that in the prior art, during the vacuum refining process, the gas or powder flow control of the steelmaking spray gun is often difficult to control, and part of the powder will be sucked away by the degassing equipment in the RH vacuum chamber, causing waste, resulting in unstable refining effect and the inability of the refined molten steel to meet the process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the full cross-section structure of the utility model; DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the various embodiments of the utility model will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the various embodiments of the utility model, many technical details are provided in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical schemes claimed for protection in the claims of the present application can be implemented.

[0021] The embodiment of the utility model relates to a RH refining spray gun, such as Figure 1 As shown, including:

[0022] The powder injection pipe 1 in this embodiment is used to introduce RH refined powder; the powder injection pipe 1 is used to inject desulfurization agent, deoxidizer, alloying agent and other powders.

[0023] The powder blowing pipe 1 is located inside the composite gas blowing pipe 2, and a composite gas is introduced between the composite gas blowing pipe 2 and the powder blowing pipe 1. The composite gas can be composed of multiple gases such as oxygen, fuel gas, inert gas, etc., and multiple refining effects such as oxygen blowing, heating, stirring, etc. can be selected according to needs.

[0024] A number of gas guide lines 3 are fixed on the inner wall of the composite gas pipe 2; during spraying, the powder and the composite gas are sprayed out synchronously. The gas guide lines 3 mainly guide and diffuse the composite gas. During spraying, the powder and the composite gas are sprayed out synchronously, and the powder located in the middle of the powder spraying pipe can be protected by the spirally sprayed composite gas and will not be sucked away by the vacuum degassing equipment, but will be gathered together and sprayed into the molten steel, thereby improving the use efficiency of the powder. When the RH refining spray gun in this embodiment is used for spraying, the gas sprayed by the composite gas pipe 2 will spirally wrap the powder to protect it from being sucked away by the vacuum degassing equipment, thereby achieving precise composition control and obtaining high-quality steel grades; spraying powder and composite gas at the same time can shorten the refining cycle and further improve the efficiency of RH refining. The invention solves the technical problem that in the prior art, during the vacuum refining process, the gas or powder flow control of the steelmaking spray gun is often difficult to control, and part of the powder will be sucked away by the degassing equipment in the RH vacuum chamber, causing waste, resulting in unstable refining effect and the inability of the refined molten steel to meet the process requirements.

[0025] In order to achieve the above technical effects, in the RH refining spray gun of this embodiment, as Figure 1 As shown, 6-12 gas guide lines 3 are arranged on the inner wall of the composite gas blowing pipe 2. In practical applications, the arrangement of 6-12 gas guide lines 3 can achieve the best refining effect, and the refined molten steel can meet the best process requirements.

[0026] In order to achieve the above technical effects, in the RH refining spray gun of this embodiment, as Figure 1 As shown, a plurality of gas guide lines 3 are arranged in a spiral and parallel manner around the inner wall of the composite gas blowing pipe 2 .

[0027] In order to achieve the above technical effects, in the RH refining spray gun of this embodiment, as Figure 1 As shown, the inclination angle of the gas guide line 3 is 30°-45°.

[0028] In order to achieve the above technical effects, in the RH refining spray gun of this embodiment, as Figure 1 As shown, the intervals between the plurality of gas guide lines 3 are consistent, rotationally symmetrical, and the rotation angles and directions are consistent.

[0029] The above structure can make the composite gas be sprayed synchronously during the spraying process, and the spraying angle and the diffusion of the powder spraying can achieve the best technical effect.

[0030] In order to achieve the above technical effects, in the RH refining spray gun of this embodiment, as Figure 1 As shown, the materials of the powder blowing pipe 1, the composite gas blowing pipe 2 and the gas guide wire 3 are all high temperature ceramics. High temperature ceramics have the technical effects of high temperature resistance and wear resistance.

[0031] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A spray gun for RH refining, characterized in that: include: Powder blowing tube; A composite gas blowing pipe, wherein the powder blowing pipe is located inside the composite gas blowing pipe, Gas guide lines, a plurality of gas guide lines are fixed on the inner wall of the composite gas pipe; during spraying, the powder and the composite gas are sprayed out synchronously.

2. The RH refining spray gun according to claim 1, characterized in that: The inner wall of the composite gas blowing pipe is provided with 6 to 12 gas guide lines.

3. The RH refining spray gun according to claim 2, characterized in that: A plurality of gas guide lines are arranged in a spiral and parallel manner on the inner wall of the composite gas blowing pipe.

4. The RH refining spray gun according to claim 3, characterized in that: The inclination angle of the gas guide line is 30°-45°.

5. The RH refining spray gun according to claim 4, characterized in that: The gas guide lines are spaced uniformly and rotationally symmetrically, and their rotation angles and directions are consistent.

6. The RH refining spray gun according to claim 1, characterized in that: The materials of the powder blowing pipe, the composite gas blowing pipe and the gas guide line are all high-temperature ceramics.

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