RH (Ruhrstahl Heraeus) ascending pipe for increasing blowing angle of small argon pipe

Abstract

An RH (Ruhrstahl-Heraeus) ascending pipe for increasing the blowing angle of a small argon pipe belongs to the technical field of out-furnace vacuum refining and comprises a steel structure and the small argon pipe, an external castable is uniformly wrapped outside the steel structure, refractory bricks are arranged on the inner circumference of the steel structure from top to bottom, and a connecting flange is mounted at the top of the RH ascending pipe. A plurality of small argon pipes penetrate into the steel structure from the lateral upper end of the RH ascending pipe and penetrate through the refractory bricks from the bottom of the RH ascending pipe, and the small argon pipes are arranged in an upper row and a lower row in a staggered mode; the argon small pipes are evenly arranged in the circumferential direction of the circumference of the RH ascending pipe, and the pipeline nozzles of all the argon small pipes rotate by the same angle clockwise or anticlockwise at the same time and have the same elevation angle relative to the horizontal plane. Compared with a traditional RH ascending pipe, on the premise that the argon flow is the same, the dispersion degree of argon bubbles in molten steel can be effectively increased, the distribution uniformity of a flow field is improved, the circulating flow of the molten steel is finally increased, and the uniform mixing time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum refining outside a furnace, in particular to an RH riser for improving the injection angle of an argon gas small tube. Background Art

[0002] In order to increase the circulation flow rate of the RH vacuum furnace as much as possible, improve the vacuum refining capacity, and shorten the vacuum treatment time, many metallurgical experts have conducted a lot of research work on the RH immersion tube. In terms of structural design, in addition to the conventional double circular immersion tube structure, there are also single nozzle immersion tube structure, double elliptical immersion tube structure, multiple immersion tube structure and other types; in terms of lifting argon, the conventional design is to arrange a certain number of argon small tubes in the riser, and use the argon bubbles to float and grow to drive the molten steel to surge up, but in order to prevent the gas flow from being too large and blowing through the molten steel in the immersion tube, the argon flow rate needs to be limited within a certain range. Chinese patent CN109652615A proposes a method for increasing the circulation flow rate of molten steel in the RH refining process, by using the existing ladle bottom argon blowing system to blow argon at the bottom, the argon bubbles blown at the bottom move with the molten steel flow field, and the molten steel is lifted into the RH immersion tube riser to effectively increase the circulation flow rate, but in this process, the molten steel seriously erodes the refractory material at the bottom of the immersion tube, which will seriously damage the life of the immersion tube. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an RH riser for improving the injection angle of the argon small tube. Without changing the structural design of the RH immersion tube, the circulation flow rate of the RH molten steel is increased, while the service life of the immersion tube is guaranteed, and the dispersion of argon bubbles in the molten steel is effectively increased and the uniformity of the flow field distribution is improved.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] The invention discloses an RH riser for improving the injection angle of argon small tubes, comprising a steel structure and argon small tubes. The outer part of the steel structure is uniformly wrapped with castable material, refractory bricks are arranged on the inner circumference of the steel structure from top to bottom, a connecting flange is installed on the top of the RH riser, a plurality of argon small tubes penetrate into the steel structure from the lateral upper end of the RH riser, and pass through the refractory bricks at the bottom of the RH riser. The argon small tubes are arranged in two rows in an upper and lower staggered manner; the argon small tubes are uniformly arranged along the circumference of the RH riser, and the pipe nozzles of all the argon small tubes are rotated clockwise or counterclockwise at the same angle at the same time, and the pipe nozzles of all the argon small tubes have the same elevation angle relative to the horizontal plane.

[0006] Furthermore, there are 10 to 12 argon lifting tubes in the steel structure, with 5 to 6 argon tubes evenly distributed in each row, the upper row is 550 mm away from the bottom of the inner tube of the riser, and the lower row is 350 mm away from the bottom of the inner tube of the riser, and the inner diameter of the argon tube is between 5 and 8 mm.

[0007] Furthermore, the pipe nozzle of the argon gas tube is simultaneously rotated 20° to 30° clockwise or counterclockwise.

[0008] Furthermore, the elevation angle formed by the pipe nozzle of the argon gas tube and the horizontal plane is 15° to 20°.

[0009] Furthermore, the steel structure and the externally wrapped castable are fixed by fastening nails.

[0010] Beneficial effects of the utility model:

[0011] Compared with the traditional RH riser, the utility model can effectively increase the dispersion of argon bubbles in molten steel and improve the uniformity of flow field distribution under the premise of the same argon gas flow rate, thereby ultimately increasing the circulation flow rate of molten steel and shortening the mixing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the internal structure of an RH riser tube for improving the injection angle of the argon gas small tube provided by the utility model;

[0013] Figure 2 The utility model provides a top view of an RH riser for improving the injection angle of an argon gas small tube.

[0014] The reference numerals in the drawings of the specification include:

[0015] 1-Steel structure, 2-Argon gas tube, 3-Casting material, 4-Refractory brick. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all of the embodiments.

[0017] Example 1

[0018] like Figure 1 to Figure 2As shown, an RH riser for improving the injection angle of argon small tubes 2 comprises a steel structure 1 and argon small tubes 2, the outer portion of the steel structure 1 is uniformly wrapped with castable material 3, refractory bricks 4 are arranged on the inner circumference of the steel structure 1 from top to bottom, a connecting flange is installed on the top of the RH riser, a plurality of argon small tubes 2 penetrate into the interior of the steel structure 1 from the lateral upper end of the RH riser, and pass through the refractory bricks 4 at the bottom of the RH riser to be arranged in two rows in an alternating manner, there are 10 to 12 argon small tubes 2 for improving argon in the steel structure 1, 5 to 6 argon small tubes 2 are evenly distributed in each row, the upper row is 550 mm away from the bottom of the inner tube of the riser, and the lower row is 350 mm away from the bottom of the inner tube of the riser; the argon small tubes 2 are evenly arranged along the circumference of the RH riser and the pipe nozzles of all the argon small tubes 2 are simultaneously rotated clockwise or counterclockwise by the same angle, and the pipe nozzles of all the argon small tubes 2 have the same elevation angle relative to the horizontal plane.

[0019] In this embodiment, the RH vacuum processing capacity is 150 tons. There are 12 argon gas tubes 2 in the RH riser, with an inner diameter of 6 mm, 6 tubes arranged in each row, and staggered distribution in the upper and lower rows; when arranging the argon gas tubes 2, the tubes are rotated 20° clockwise at the same time, and the nozzle elevation angle is 15°. Through actual production verification, under the premise that the argon gas flow rate is maintained at the same level, compared with the traditional RH riser, the technical solution in this embodiment can increase the RH molten steel circulation flow rate by about 12% and shorten the mixing time by about 17%.

[0020] Example 2

[0021] like Figure 1 to Figure 2 As shown, an RH riser for improving the injection angle of argon small tubes 2 comprises a steel structure 1 and argon small tubes 2, the outer portion of the steel structure 1 is uniformly wrapped with castable material 3, refractory bricks 4 are arranged on the inner circumference of the steel structure 1 from top to bottom, a connecting flange is installed on the top of the RH riser, a plurality of argon small tubes 2 penetrate into the interior of the steel structure 1 from the lateral upper end of the RH riser, and pass through the refractory bricks 4 at the bottom of the RH riser to be arranged in two rows in an alternating manner, there are 10 to 12 argon small tubes 2 for improving argon in the steel structure 1, 5 to 6 argon small tubes 2 are evenly distributed in each row, the upper row is 550 mm away from the bottom of the inner tube of the riser, and the lower row is 350 mm away from the bottom of the inner tube of the riser; the argon small tubes 2 are evenly arranged along the circumference of the RH riser and the pipe nozzles of all the argon small tubes 2 are simultaneously rotated clockwise or counterclockwise by the same angle, and the pipe nozzles of all the argon small tubes 2 have the same elevation angle relative to the horizontal plane.

[0022] In this embodiment, the RH vacuum processing capacity is 150 tons. There are 11 argon gas tubes 2 in the RH riser, with an inner diameter of 8 mm, 5 in the upper row and 6 in the lower row, and the upper and lower rows are staggered. When arranging the argon gas tubes 2, the tubes are rotated 25° clockwise at the same time, and the nozzle elevation angle is 15°. Through actual production verification, under the premise that the argon gas flow rate is maintained at the same level, compared with the traditional RH riser, the technical solution in this embodiment can increase the RH molten steel circulation flow rate by about 13% and shorten the mixing time by about 18%.

[0023] Example 3

[0024] like Figure 1 to Figure 2 As shown, an RH riser for improving the injection angle of argon small tubes 2 comprises a steel structure 1 and argon small tubes 2, the outer portion of the steel structure 1 is uniformly wrapped with castable material 3, refractory bricks 4 are arranged on the inner circumference of the steel structure 1 from top to bottom, a connecting flange is installed on the top of the RH riser, a plurality of argon small tubes 2 penetrate into the interior of the steel structure 1 from the lateral upper end of the RH riser, and pass through the refractory bricks 4 at the bottom of the RH riser to be arranged in two rows in an alternating manner, there are 10 to 12 argon small tubes 2 for improving argon in the steel structure 1, 5 to 6 argon small tubes 2 are evenly distributed in each row, the upper row is 550 mm away from the bottom of the inner tube of the riser, and the lower row is 350 mm away from the bottom of the inner tube of the riser; the argon small tubes 2 are evenly arranged along the circumference of the RH riser and the pipe nozzles of all the argon small tubes 2 are simultaneously rotated clockwise or counterclockwise by the same angle, and the pipe nozzles of all the argon small tubes 2 have the same elevation angle relative to the horizontal plane.

[0025] In this embodiment, the RH vacuum processing capacity is 150 tons. There are 12 argon gas tubes 2 in the RH riser, with an inner diameter of 8 mm, 6 tubes arranged in each row, and staggered distribution in the upper and lower rows; when arranging the argon gas tubes 2, the tubes are rotated 30° clockwise at the same time, and the nozzle elevation angle is 20°. Through actual production verification, under the premise that the argon gas flow rate is maintained at the same level, compared with the traditional RH riser, the technical solution in this embodiment can increase the RH molten steel circulation flow rate by about 12% and shorten the mixing time by about 18%.

Claims

1. A RH riser for increasing the injection angle of the argon gas tube, characterized in that: It includes a steel structure and small argon tubes. The outside of the steel structure is evenly wrapped with castables. Refractory bricks are arranged around the inner circumference of the steel structure from top to bottom. A connecting flange is installed on the top of the RH riser. Multiple small argon tubes penetrate into the steel structure from the upper end of the RH riser and pass through the refractory bricks at the bottom of the RH riser. The small argon tubes are staggered in two rows, upper and lower. The small argon tubes are evenly arranged along the circumference of the RH riser and the pipe nozzles of all the small argon tubes are rotated clockwise or counterclockwise at the same angle at the same time, and the pipe nozzles of all the small argon tubes have the same elevation angle relative to the horizontal plane.

2. The RH riser for improving the injection angle of the argon small tube according to claim 1, characterized in that: There are 10 to 12 argon lifting tubes in the steel structure, 5 to 6 argon tubes are evenly distributed in each row, the upper row is 550mm away from the bottom of the inner tube of the riser, and the lower row is 350mm away from the bottom of the inner tube of the riser. The inner diameter of the argon tube is between 5 and 8mm.

3. The RH riser for improving the injection angle of the argon small tube according to claim 1, characterized in that: The pipeline nozzle of the argon gas small tube is rotated clockwise or counterclockwise by 20° to 30° at the same time.

4. The RH riser for improving the injection angle of the argon small tube according to claim 1, characterized in that: The elevation angle formed by the pipeline nozzle of the argon gas small tube and the horizontal plane is 15° to 20°.

5. The RH riser for improving the injection angle of the argon small tube according to claim 1, characterized in that: The steel structure and the externally wrapped castable are fixed by fastening nails.

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