JPH0488110A - Nozzle for melting and removing stuck metal on furnace opening part in converter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a nozzle for dissolving and removing ingots adhering to the mouth of a converter using oxygen ejected from a main lance for blowing (hereinafter referred to as a lance). Regarding.

[Prior art] In blowing steel in a converter, a blowing lance is inserted into the converter, and high-pressure oxygen is blown onto the molten steel from the tip of the lance, causing the C in the molten steel to react with oxygen to generate C○. It is done by letting During this blowing, metal adheres to the converter mouth due to slopping and spitting. If metal adheres to the converter mouth, it may interfere with the charging of raw materials, or the metal that adheres during blowing may fall back into the molten steel, causing the molten steel composition to fluctuate and become inconsistent. Therefore, I try to remove it regularly.

As a conventional method for removing the base metal adhering to the converter mouth as described above, there is a method of using the above-mentioned blowing lance and blowing out high pressure oxygen from the lance to melt and remove the base metal. As a conventional technique for removing metal using a lance, there is a technique described in Japanese Unexamined Utility Model Publication No. 1-102146. As shown in FIGS. 3 and 4, this technology uses a chain 23 to connect a disk 22 that functions as a nozzle with oxygen guide plates 21 provided radially to the oxygen ejection holes of a lance 24.
5 and fixed with fixing bolts 26, high pressure oxygen is spouted from the oxygen jet hole 25 of the lance 24, and the converter 2
High-pressure oxygen is blown onto the base metal 28 attached to the furnace opening in step 7 to melt and remove the base metal.

[Problems to be Solved by the Invention] However, the conventional method for removing metal attached to the converter mouth using a conventional lance has the following problems. In other words, the high-pressure oxygen ejected from the lance hits the disk acting as the nozzle, spreads radially horizontally along the oxygen guide plate of the disk, and evenly hits the metal attached to the converter mouth. However, since the high-pressure oxygen ejected from the lance's oxygen vents tends to flow in a certain direction, the pressure of the high-pressure oxygen that hits the metal varies depending on the location. As a result, there are parts where the melt can be cut quickly and parts where the melt cut time is delayed, and there is a problem that it takes time to remove the metal as a whole.

This invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide a nozzle for removing ingots attached to the converter mouth by fusing and removing ingots attached to the converter mouth in a short time.

[Means for Solving the Problems] A nozzle for removing ingots attached to the converter mouth according to the present invention includes an end plate having a plurality of openings at one end, which is attached externally to the tip of the main lance for converter blowing. A short tube, a rotary support shaft provided at the center of the end plate facing outward from the end plate along the axis of the short tube, and a rotary support shaft rotatably fitted to the rotary support shaft via a bearing. This is a nozzle for melting and removing ingots adhering to the converter mouth, which consists of a circular plate with a radial oxygen guide plate.

[Function] The nozzle for removing ingots attached to the converter mouth according to the present invention includes a short tube having an end plate having a plurality of openings at one end, which is attached externally to the tip of the main lance for converter blowing; A rotation support shaft provided at the center of the end plate facing outward from the end plate along the axis of the short cylinder, and a radial oxygen guide plate rotatably fitted to the rotation support shaft via a bearing. It is composed of a disc with a With this structure, when this nozzle is attached to the tip of the main lance for converter blowing and high pressure oxygen is spouted from the lance, the high pressure oxygen passes through the plurality of openings in the end plate of the short cylinder and is The high-pressure oxygen that hits the 0 disk, which is a disk with radial oxygen guide plates, flows along the oxygen guide plate of the disk, so it imparts a rotational force to the disk.

Since the disc is rotatably fitted to the rotational support shaft via a bearing, it rotates around the rotational support shaft.

As the disk rotates, the flow rate of high-pressure oxygen ejected from the disk along the oxygen guide plate becomes a certain constant value, so the melting speed of the metal remains constant at any position at the furnace mouth, and as a result, Metal removal time is reduced.

[Example] A nozzle for removing metal deposited at the converter mouth according to an example of the present invention was
This will be explained with reference to the drawings and FIG. FIG. 1 shows a first embodiment of the present invention.
1 is an explanatory diagram showing a vertical cross section of a nozzle for removing ingots attached to the converter mouth according to an embodiment of the present invention. The nozzle for melting and removing ingots attached to the converter mouth according to an embodiment of the present invention has a main lance 24 for blowing in the converter. A plurality of openings 1 are provided at one end which is externally mounted at the tip and is attached with bolts 11.
a short tube 3 with an end plate 2 having a rotary support shaft 4 provided at the center of the end plate 2 and extending outward from the end plate 2 along the axis of the short tube 3; A disk 7 having a radial oxygen guide plate 6 rotatably fitted through a bearing 5.

A method for removing ingots adhering to the converter mouth using the nozzle for melting and removing ingots adhering to the converter mouth according to one embodiment of the present invention configured as described above is as follows. After a nozzle for removing ingots adhering to the converter mouth is attached to the tip of the main lance 24, the tip of the main lance 24 is positioned at the furnace mouth of the converter, and high-pressure oxygen is jetted out from the oxygen jet hole 25 of the main lance 24. .

High-pressure oxygen ejected from the oxygen ejection hole 25 passes through the plurality of openings 1 in the end plate 2 of the short tube 3 and hits the disk 7. and,
The oxygen flows in the circumferential direction on the disk 7 along with a plurality of oxygen guide plates 6 provided radially on the disk 7. At this time, the high-pressure oxygen applies a force to the oxygen guide plate 6 in the tangential direction of the disk 7, and this force causes the disk 7 to rotate around the rotational support shaft 4. The high-pressure oxygen is fed by a rotating disk 7.
The 8-disk plate 7 advances in the circumferential direction of the disk 7 along the oxygen guide plate 6 of the disk 7, is discharged from the disk 7 in a spiral shape, hits the high-temperature ingot attached to the converter mouth, and melts the ingot. Since the disc 7 is rotating, the flow rate of the high-pressure oxygen discharged from the opening is the same, and as a result, the rate of melting the metal is constant all around the furnace mouth.
Compared to conventional methods in which the flow rate is not constant over the entire circumference, the metal melting speed is faster and the melting time can be shortened.

Figure 2 schematically shows the flow of high-pressure oxygen discharged from the disk 7. By making the oxygen guide plate 6 streamlined like a windmill, the disk 7 can be rotated more smoothly. You can do it.

The nozzle for removing ingots attached to the converter mouth according to one embodiment of the present invention is attached to the main lance with bolts, but it may be attached not only with bolts but also with any existing method as appropriate.

[Effects of the Invention] According to the present invention, base metal adhering to the mouth of the converter can be melted and removed in a short time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a vertical cross section of a nozzle for removing metal adhered to the converter mouth according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing the flow of high-pressure oxygen discharged from a disk, and FIG. FIG. 4 is an explanatory diagram of a conventional nozzle for removing metal deposited at the mouth of a converter. 1. Opening, 2. End plate, 3. Short tube, 4 Rotating shaft, 5
... Bearing, 6. Oxygen guide plate, 7. Disc.

Claims (1)

[Claims] A short tube having an end plate having a plurality of openings at one end, which is attached externally to the tip of the main lance for converter blowing, and a tube extending outward from the end plate along the axis of the short tube at the center of the end plate. An ingot attached to the mouth of a converter, comprising a rotating support shaft provided toward the rotating support shaft, and a disc having a radial oxygen guide plate rotatably fitted to the rotating support shaft via a bearing. removal nozzle.