JPS58185704A - Removing device of base metal - Google Patents

Abstract

PURPOSE:To provide a removing device for base metal which melts away quickly and surely the base metal stuck to the inside circumferential wall surface of a treating vessel for molten metal by providing a gas diverging member in the gas jection part of a long-sized lance and a gas ejecting hole having the special construction between the same and the bottom end surface thereof. CONSTITUTION:The base metal S sticking to the inside wall 2b of an RH type vacuum degassing vessel 2 during the treatment of molten steel is melted away while the treatment of the molten steel in the vessel 2 is in pause. More specifically, a long-sized lance 8 is moved downward along a vertical moving guide 5 so as to be inserted 4 into the vessel 2 and when a gas ejecting part 14 arrives at the top end position of the metal S, a motor 6d is run at a low speed and gaseous O2 is ejected horizontally and radially from the ejection port EX of the ejection nozzle 14. As a result, gaseous fuel and the gaseous O2 are bombarded uniformly against the entire circumferential surface of the metal S, and the metal S is melted away successively from the upper part to the lower part. When the ejecting part 14 arrives at the bottom end position thereof, the low speed driving of the motor 6d and the supply of the gaseous O2 through the pipe 13 are stopped.

Description

[Detailed description of the invention] A metal removal device that quickly and reliably melts and removes metal adhered to the inner wall surface of a vacuum degassing container such as the mouth of a converter, R, H, Dll, or a ladle. It is related to.

In the conventional metal removal device, a long lance is lowered along the axis of a molten metal processing container (hereinafter simply referred to as molten metal container), and the gas ejecting part at the tip is removed from the metal on the inner wall surface. The fuel gas is positioned at the same height as the adhesion part, and the fuel gas is ejected radially in a substantially horizontal direction from the gas ejection part to melt and remove it.

The structure of this gas ejection part is as shown in FIG.
A horizontal current transformation disk 103 is disposed facing the lower end opening 102 of 1, and a large number of supporting members 104 are disposed at predetermined intervals around the peripheral edge of the opening. Since it is connected to the periphery of the upper surface of the current transformation disk 103, the spout 1 formed between the upper surface of the disk and the opening of the long lance.
The fuel gas flow from No. 05 did not form a uniformly thick ejected film, and it was not possible to uniformly melt and remove the deposited metal on the inner wall circumferential surface at the same time.

This requires a lot of time, such as rotating a long lance and repeating many upward and downward movements, and furthermore, it is not possible to melt and remove the base metal evenly, so localized melting damage of the inner wall bricks to which the base metal is attached cannot be avoided8.
Therefore, in order to avoid this, it is necessary to discontinue the process with a large amount of metal remaining, and as long as there is this residual metal, drastic measures are required to make the bath water into the molten metal container. Ta.

In addition, vacuum degassing machines such as R11, I) II, which have a molten metal outlet/inlet at the bottom, can be used to remove bare metal by adhering to the inner wall of the lagoon. The structure is such that one part can be separated from the other, and after the separated molten metal adhering parts have been cooled, workers enter the parts and spend a great deal of time and effort to melt and remove the molten metal in the vacuum degassing tank. This significantly reduced the processing efficiency. In addition, as a method to prevent the molten metal from adhering, a heating electrode,
A heater such as a gas burner is installed to heat the bath water treatment chamber to a high temperature and melt the scattered molten steel that adheres to the inner wall, but there are restrictions on the installation and maintenance of the heater and its ancillary equipment. However, this method is complicated and has problems such as being unfavorable in terms of energy saving.

The present invention provides an excellent metal removal device that solves the above problems by one, and the gist thereof is the same.

(1) General - A long lance is moved up and down at the axial center in a hammer processing container, and fuel gas is injected from the gas jetting part of the long lance onto the metal attached to the inner wall surface of the container. In the metal removal device for melting and removing the long lance, the gas ejection part of the long lance is connected to (1) a gas distribution system in which a plurality of gas distribution holes are arranged around the axial center and penetrate through the upper and lower ends along the axial center; (1) Connect the central part to the lower end center part of the gas distribution member with a connecting member, and form a gas radial jet 1-1 between the upper end surface around the connection member and the lower end surface of the gas distribution member. 1. A metal removal device characterized by comprising a gas radiation current changing member.

(2) A long lance is moved up and down at the axial center in the molten metal processing container, and fuel gas is injected from the gas jetting part of the long lance onto the metal adhered to the inner wall surface of the container. In a metal removal device for melting and removing metal, a long lance insertion/inlet is provided in the center of the upper wall of the container, an opening/closing lid is provided outside the insertion outlet, and a long lance is guided above this so that it can be raised and lowered. In addition to providing a lance lifting guide to support the lance, an elevating and lowering drive device for the elongated lance is provided, and the gas ejection portion of the elongated lance is
(2) A gas distribution member in which a plurality of gas distribution holes are arranged around the axial center along the axis and extending through the upper and lower ends; death,
1. A metal removal device comprising a gas radiation current changing member having a gas radiation outlet formed between an upper end surface around the upper end surface and a lower end surface of the gas distribution member.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 and 6. Note that this embodiment is applied to an RH type vacuum degassing tank 2 as a molten metal container.

A lance insertion/inlet 4 passing through the inside and outside is provided in the center of the upper wall 2a of the vacuum degassing tank 2, and an opening/closing lid 3 is provided outside the lance insertion φ inlet 4. The opening/closing lid 3 is opened when the long lance 8 is inserted into the tank, and is closed after the long lance 8 is inserted outside the tank.As shown in FIG. is attached. The rotating member 18 has its rear end rotatably supported by a pin 18a on the front end of the pedestal 11 on the upper wall 2a of the tank 2, and its upper center portion is connected to the tip of the piston rod 8' of the air cylinder 9 and the pin 10. The opening and closing operations are performed by driving the piston of the air cylinder 9 forward and backward. The air cylinder 9 is rotatably supported on the pedestal 11 by means of bins 12 on both sides of the center. 19 is a flexible tube that covers the outer peripheral surface of the piston rod 8'.

The lance elevating guide 5 guides the elongated lance 8 into and out of the tank from the lance insertion/exit opening 4, that is, the elevating movement. Two guide rails 5a, 5b arranged in a rope shape along the lance hoistway above the exit/entrance 4 and these rails 5a.
, 5bffi, and the guide rolls 17a and 17bi of the elevating cart 17 attached to the rear of the elongated lance 8 are engaged with and supported in a movable manner.

The lance lifting drive device 6 moves the long lance 8 up and down, and includes a lifting cart 17 on which the rear part of the long lance 8 is attached.
It consists of a wire rope 6a with a tip attached to the upper end, a pulley 61) for guiding the wire rope 6a, and a driving motor 5d to which the other end of the wire rope 6a is attached and winds and rotates the wire rope 6a. It is.

As shown in FIG. 6, the long vessel 8 has a double structure cooling water discharge passage 81), which has an oxygen gas passage in the middle part and a lance tip connected to the outside thereof. An oxygen gas supply pipe 13 is connected to the inlet U] (rear end) of the oxygen scum flow path 8a, and an injection nozzle 14 is attached to the outlet 1' part (tip) K, and the cooling water is A cooling water supply pipe 15 is connected to the inlet of the supply path 8b, and a kid cooling water drain pipe 16 is connected to the outlet of the cooling water drainage path 8C, and these pipes 13, 15, 16 are long. The main tube 13 is made of flexible blue and has a fixed position, which can be moved within the range of vertical movement of the shaku lance.
A, +5 A, If] A is connected for communication (Fig. 2).

The fuel gas outlet [1] of the long lance 8 is attached to the periphery of the core 1411, as shown in FIG. Axis □ Along the heart” 2.
A gas distribution member 14a is formed by stacking a plurality of negative through gas distribution holes 14b at equal intervals across the lower end, and a protruding member 14cf is provided as a VC connection part at the center of the upper end of the gas distribution member 14a. , and a disk-shaped gas radiation current transformation member 1.1d whose central portion is screwed and connected to this. The peripheral edge of the upper end of the gas distribution member 14a is firmly connected to the communication portion of the cooling water supply/discharge path at the tip of the long lance 8, and the gas distribution hole 141] inlet 11tll'! It is connected to the outlet of the oxygen gas flow path 8a in the long lance 8. The inlets and outlets of the gas distribution holes 14b are each formed in a trumpet shape. The upper end surface of the waste radiation current transformation member 14d is a flat surface,
Between this and the lower end circumferential surface of the gas distribution part 1-4a, radial gas ejection ports EX are formed which communicate with the outlets of each gas distribution hole 14b opened in the lower end surface.

With this configuration, the waste ejection section 14 causes the oxygen gas from the oxygen gas flow path 8a to evenly collide with the upper end surface of the waste radiation current transformation member 14a through the simultaneous flow holes 14b, and spreads the oxygen gas along the upper end surface. It forms a planar radial uniform oxygen gas flow film and injects it from the entire circumference of the jet nozzle EX, thereby melting and removing the base metal attached to the inner circumferential wall of the molten metal container or the inner cylindrical surface of the converter mouth at a uniform speed. .

Reference numeral 14' in FIG. 7 is another example of the gas ejection part, and the special VC
The outer circumferential surface of the waste radiation current transformation member 1・ld′ and the gas distribution member l・1a/(・− It is shaped like a bell, and this allows the gas ejecting parts 1 and 1' to be placed in a position closer to the base metal adhering part, thereby making it possible to shorten the length of the long lance.Other parts are shown in Figure 6. It is the same as that shown in (a) and (o), and the same reference numeral is appended with '.

The inner wall 21 of the type 111 vacuum degassing tank 2 is constructed as shown below.
1, the operation of melting and removing the base metal S attached during the molten steel processing in the tank 2 during a pause between each molten steel processing will be explained.

The opening/closing lid 3 is opened by the air cylinder 9, and then the electric drive motor 6 (1) is driven to rewind the drum 6ck at a constant speed to lower the long lance 8 along the lifting guide 5, and insert the lance of the nuclide 2. The waste injection part 1 of the long lance 8 is inserted into the tank from the outlet/inlet 4 and is placed at the upper end position of the layered metal S.
4, the electric drive motor 6di is shifted to a low speed, and oxygen gas is supplied from the oxygen gas supply pipe 1:3), and the injection nozzle 14 is ejected [by injecting oxygen gas horizontally and radially from IEX]. , the adhered metal S is made to collide with the entire circumferential surface of the adhered metal S to sequentially melt and remove the metal from S6-H to the bottom, and when the gas injection part 14 reaches the lower end position, the electric drive motor 6d and the oxygen gas supply from the oxygen gas supply pipe 13 are stopped.

If the deposited metal remains after this, the electric drive motor 6d is immediately driven to take up the drum 6C at a constant speed, and the elongated lance 8 is raised along the lifting guide 5.
The height position of 4 is returned to the upper end of the base metal adhering area, and the above operation is repeated again. When the adhered base metal is removed, the elongated lance 8 is moved upward, and the lance 8 of the nuclide 2 is inserted into the tank from the inlet 4. The part is taken out of the tank and stopped at a predetermined position to wait until the next metal removal operation. Immediately after the elongated lance 8 is taken out of the tank, the opening/closing lid 3 is closed by an air cylinder 9 to seal the lance insertion/inlet 4.

(1) The injection flow rate and flow rate of oxygen gas injected from the ejection port EX of the gas ejection part 14 provided at the tip of the long lance 8 during the ingot removal are determined by the temperature of the ingot adhered to the ingot 8 and its temperature. The flow rate per attached area is set according to the injection distance from the surface, and the low speed pattern required for melting and removing the metal of the long lance is a variable speed pattern according to the height distribution of all the adhered metal. It is preferable to do so.

For example, as shown in Fig. 2, in a vacuum descaling tank 2 with an inner diameter of 2300 mm, a 2000 + IP height clay layer 1 is placed on the inner wall 2b.
When removing the base metal S deposited on the periphery in a donut shape with a triangular cross section and an inner diameter of 1000 as shown in the figure, the gas ejection part 14 of the long lance 8 is moved from the inner diameter center position force 1 of the base metal 8. When it starts moving downward at a speed of 50-1 from the point of arrival at a position 1000mm above, K, 1500~3ooo
Oxygen gas is ejected with Nm'llr, and 30
The flow rate per unit area is 53 to 106 N at the collision flow rate of
yy//sushi/mz 2 were injected, and after moving down 2000mm, they were stopped and the state of melting and removal of the metal inside was observed, and it was found that the donut-shaped metal 8 had an inner diameter of 1300 mm.
As a result, the adhesion area in the longitudinal direction of the inner wall of the tub could be made to be 11,000 mm. These operations were repeated four more times to completely melt and remove the base metal S.

As described above, the present invention removes ingots attached to the furnace opening or the peripheral surface of the inner wall of a molten metal processing operation such as a converter or R)I descaling tank from the end of molten metal processing in the container to the start of the next processing. During the process, it can be quickly and reliably removed at an even rate of melting and removal, without melting the bricks, and removing the entire amount of additives for composition adjustment. The molten metal can be poured into the container and has excellent effects such as eliminating any loss and enabling smooth and safe molten metal processing operations in the container.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing a conventional gas ejection part, Fig. 2 is an overall side explanatory view showing one embodiment of the device of the present invention, and Fig. 3 is a side explanatory view showing the main part of the lid opening/closing mechanism as shown in Fig. 2. , FIG. 4 is a side view showing the long lance attached to the main part lance elevating kite shown in FIG. 2, FIG. 5 is a cross-sectional view taken from view A-A in FIG.
Figures (a) and (b). (C) shows an embodiment of the gas ejection part in the present invention, (A) is a side view of a partial longitudinal section, (B) is a cross-sectional view taken from arrow H-B in (A), ( C) fl (B) Nori, 7 (
(A cross-sectional view from knee C, Fig. 7 shows the present invention.
A vertical section of a part showing another example of the gas ejection part
A picture of a mask. 1-1.5: Lance lifting/lowering guide, 6: Lance lifting/lowering drive device, 8: Long lance, 1i, +4': Scrap ejection part. Patent applicant Representative patent attorney Tomoyuki Yafuki (and 1 other person) No. 1B (A) +04 Figure 2

Claims (2)

[Claims] (1) A long lance is moved up and down at the axial center in the molten metal processing container, and fuel gas is injected from the gas jetting part of the long lance onto the metal attached to the inner wall surface of the container to remove the metal. In the metal removal device that melts and removes the metal, the gas ejection part of the long lance is arranged around the axial center part by a gas distribution system in which a plurality of gas distribution holes penetrating the upper and lower ends along the axial center are arranged. (1) A gas distributing member whose central part is connected to the lower end central part of the gas diverting member by a connecting member, and a gas radiating outlet is formed between the upper end surface around the connecting member and the lower end surface of the waste diverting member. 1. A metal removal device comprising a radial current-changing member. (2) A long lance is moved up and down at the axial center in the molten metal processing container, and the entire fuel gas is injected from the gas jetting part of the long lance to the metal layered on the inner wall surface of the container. In a bullion removing device for melting and removing metal, a long outlet is provided in the medium heating part of the upper wall of the container, and a long outlet is provided outside the insert and outlet 1.
11 is provided with an opening/closing lid, and above this is provided a lance elevating guide that supports the kite so that the elongated lance can be raised and lowered, as well as an elevating and lowering drive device for the elongated lance, and the gas ejection part of the elongated lance is A waste flow dividing member having a plurality of gas flow dividing holes arranged around the shaft center along the axis and extending through the upper and T ends; 1. A metal removal device comprising a gas radiation current changing member connected by a connecting member and having a gas radiation outlet formed between an upper end surface around the connecting member and a lower end surface of the gas distribution member.