KR101669138B1 - Gas Shooting Lance having Rotatable Injecting Nozzle and Slag out-flow Prevention Apparatus having the Same - Google Patents

Gas Shooting Lance having Rotatable Injecting Nozzle and Slag out-flow Prevention Apparatus having the Same Download PDF

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Publication number
KR101669138B1
KR101669138B1 KR1020140192214A KR20140192214A KR101669138B1 KR 101669138 B1 KR101669138 B1 KR 101669138B1 KR 1020140192214 A KR1020140192214 A KR 1020140192214A KR 20140192214 A KR20140192214 A KR 20140192214A KR 101669138 B1 KR101669138 B1 KR 101669138B1
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South Korea
Prior art keywords
lance
inert gas
injection
slag
gas
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KR1020140192214A
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Korean (ko)
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KR20150080419A (en
Inventor
유계현
박진철
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주식회사 우진
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The present invention relates to a gas injection lance capable of preventing scattering of slag and efficiently pushing out slag by allowing high-pressure inert gas to be injected while rotating in a refining process, and a slag leakage preventing device having the same. A gas injection lance for slag leakage prevention, comprising: a pipe structure having one end connected to an inert gas supply tube, a passageway through which an inert gas moves, and an opening for discharging an inert gas at the other end; And a nozzle module fastened to the other opening of the pipe structure and forming a helical flow passage in the inner space to discharge the inert gas while rotating.

Description

Technical Field [0001] The present invention relates to a gas injection lance having a rotary injection nozzle and a slag leakage prevention device having the same. [0001] The present invention relates to a gas injection lance having a rotary injection nozzle,

The present invention relates to a slag leakage preventing device, and more particularly, to a gas injection lance capable of preventing scattering of slag and efficiently pushing out slag by allowing high-pressure inert gas to be injected while rotating in a refining process. To the slag leakage preventing device.

Generally, after completing the refining operation of molten steel in a converter, slag in the upper part of the molten steel flows along with the molten steel according to each step when molten steel is introduced into the ladle. The first stage occurs when slag located in the upper part of the molten steel first reaches the ladder of the converter due to the difference in specific gravity between the molten steel and the slag when the ladle starts to lean at the beginning of the ladle. In the second stage, And the slag flows out together with the molten steel. Finally, the slag flows out through the ladle at the time when the molten steel is completely drained.

The leakage of such slag eventually deteriorates the quality of the molten steel as the impurities contained in the slag melt in the molten steel, so that much research has been conducted to prevent the slag from leaking out. A method of cutting slag by using a mechanism for forcibly closing the ladle of a converter at the time when the molten steel is completely drained, and a method of cutting the slag by injecting an inert gas when the molten steel is introduced .

As shown in FIG. 1, a slag cutting method using a mechanism is performed by using a check ball or a dart, and at the time of completion of molten steel leaching, ) And putting the check ball or dart into the molten steel. Such a mechanical slag cutting method has a problem in that the drop hit rate with respect to the precise position of the transfer lane opening 1a is low in a manner in which the darts 3 are dropped using a bar-shaped transfer 2 . Further, even if the darts 3 are dropped at the correct position, there is a problem that the outflow of the slag S can not be completely prevented.

As shown in FIG. 2, when the molten steel in the converter 1 is injected with argon gas, which is an inert gas, in the vertical direction of the furnace 1, the slag cutting method using the gas injection, The slag S immediately below the ladder is pushed out of the ladle by the injection gas, thereby blocking the slag S from flowing out. In the slag cutting method using gas injection, a high pressure inert gas is injected in the vertical direction of the lower side of the slag upper layer portion by using the lance 2, and the inert gas pushes the slag S while colliding with the slag S . For this purpose, the injection nozzle 4 for increasing the injection speed of the inert gas is separately fastened to the tip of the lance 2.

3, the injection nozzle 4 comprises a hollow outer body 4a and a hollow inner body 4b which is fastened inside the outer body 4a, and the gas discharge port has a venturi tube structure . The inert gas Ar injected from the nozzle 4 having such a structure is injected in a straight line.

The surface of the inert gas Ar injected and the surface of the slag S or the molten steel M collides head-on in a straight line, and a part of the slag S or the molten steel M (splash, splash, (Nozzle) of the lance 4 while sticking up to the vertical upper side as shown in FIG. 2 (b). The present S 'formed at the tip of the lance thus blocks the nozzle 4 at the tip of the lance 2, which makes it difficult to control the injection amount and speed of the inert gas.

In addition, the conventional injection nozzle 4 has a problem in that the same amount of inert gas is consistently injected only in the same direction, and inert gas of appropriate strength can not be injected to various kinds of molten steel having different viscosities. It is preferable that the injection nozzle 4 injects inert gas in a wide range in a relatively small range for molten steel having relatively low viscosity and strongly injects inert gas in a narrow range for molten steel having relatively high viscosity. That is, the injection nozzle 4 needs to diffuse or concentrate the inert gas injected in accordance with the viscosity of the molten steel.

Further, in the slag cutting method using gas injection, a beam lance 2 capable of extending in the longitudinal direction is drawn into the interior of the converter 1 to inject an inert gas. At this time, the high temperature state is maintained in the inside of the converter 2 by the heat generated from the molten steel M, and the lance 2 having a predetermined length is exposed to the high temperature state for a long time and can be bent downward by gravity . In order to prevent the lance 2 from being held in the interior of the converter, the lance 2 is taken out to the outside of the converter at a predetermined time interval, and then the operation is performed again. Therefore, the lubrication operation of the molten steel can not be performed quickly, and the work is troublesome.

Korean Patent Publication No. 10-2002-0051964 Korean Patent Publication No. 10-2004-0006155

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a lance which is capable of changing the structure of a nozzle fastened to a tip end of a lance, And preventing the slag from being formed at the same time, and at the same time, it is possible to push out the slag efficiently, and a slag leakage prevention device having the gas injection lance.

Another object of the present invention is to provide a spray lance having a structure capable of appropriately diffusing or concentrating an inert gas sprayed in accordance with the viscosity of molten steel and a slag leakage prevention device having the same.

Another object of the present invention is to provide a slag leakage prevention device capable of preventing the lance from being stuck due to high temperature inside the converter by rotating the lance in the longitudinal direction about the axis in a predetermined angle and period.

According to an aspect of the present invention, there is provided a gas injection lance for preventing slag leakage, the gas injection lance having one end connected to an inert gas supply tube, a passageway through which an inert gas moves, A pipe structure having an opening for discharging; And a nozzle module fastened to the other opening of the pipe structure and forming a helical flow passage in the inner space to discharge the inert gas while rotating.

The nozzle module includes an outer body forming a space portion therein, an inner body formed in a spiral shape along the outer circumferential surface to form a helical flow path between the inner walls of the outer body, And a fastening means for fastening the body to the external body.

The helical flow passage is formed to increase or decrease in width toward the discharge port.

The fastening means includes a fastening protrusion projecting upward and downward from a central axis of the inner body, a hole penetrating the inert gas, a central portion connected to the fastening protrusion, and an edge formed in the inner wall of the outer body, And a circular engagement rib which is engaged with and clamped by the circular engagement rib.

In addition, the inner body is fastened to the outer body so as to be rotatable about the fastening protrusion in accordance with the flow of the inert gas.

The apparatus for preventing slag leakage according to an embodiment of the present invention includes the gas injection lance having the above-described configuration; A gas supply unit for supplying an inert gas to the injection lance; A lance inclination angle adjuster for adjusting a vertical inclination angle of the injection lance; A lance advance / retreat driving unit for moving the injection lances from the support to the front and rear; A lance rotation unit for rotating the injection lance about the longitudinal direction; And a control unit for controlling the gas supply unit, the lance inclination angle adjusting unit, the lance forward / backward driving unit, and the lance rotation unit.

Here, the lance rotation unit is configured to reciprocally rotate the injection lance at a rotation angle of 15 to 30 degrees in the lateral direction.

According to the present invention having such a constitution as described above, the high-pressure syringe is injected through the nozzle at the tip of the lance while being rotated, so that the slag can be efficiently pushed out and prevented from scattering due to collision between the injection gas and the slag or molten steel, The present formation can be minimized.

In addition, according to the present invention having the above-described structure, it is possible to appropriately select a spray nozzle of a diffusion type, a general type or a concentrated type according to the kind of molten steel having different viscosities, thereby effectively preventing the slag outflow.

In addition, according to the present invention, the lance is rotated in the left and right directions at a predetermined angle and period, thereby preventing the lance from being sagged by the high temperature in the converter.

1 is a schematic view showing an apparatus for preventing slag leakage using darts according to the prior art,
FIG. 2 is a schematic view showing an apparatus for preventing slag leakage using an inert gas according to a conventional technique,
Fig. 3 is a cross-sectional view schematically showing the nozzle structure of the distal end portion of the lance, which is a main part of Fig. 2,
4 is a schematic view showing a slag leakage preventing device according to an embodiment of the present invention,
FIG. 5 is a side view of a slag leakage prevention device according to an embodiment of the present invention,
Fig. 6 is a front view showing the lance rotation structure of Fig. 5,
FIG. 7 is a cross-sectional view schematically showing the nozzle structure of the lance tip portion, which is the main part of FIG. 4;
8 is a conceptual view showing an injection path of the inert gas by the nozzle of Fig. 7, and Fig.
9 to 11 are views showing various modified examples of the injection nozzle according to the embodiment of the present invention and the slag prevention structure thereof.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic view showing an apparatus for preventing slag leakage according to an embodiment of the present invention. As shown in the figure, the slag leakage preventing apparatus 10 of the present invention is installed around a converter of a workplace where a converter 20 is installed. In the fixed support 100 fixed to a work ceiling, an H- The lance support 200 is fastened to the lance support 200 by the lance carrier 220 and the injection lance 300 is fastened to the lance support 200 by the lance carrier 220 from below the lance support 200. A gas supply tube 310 for providing a high pressure inert gas is connected to the rear of the injection lance 300 (hereinafter, the forward direction is defined as forward), and a lance support 200 300 are moved forward and backward.

Here, the H-beam 110 and the hoist wire 120 constitute a lance tilt angle adjuster for adjusting the vertical angle of the injection lance 300. That is, the rear end of the lance support 200 is hinged to be vertically rotatable on the H-beam 110 vertically extending below the fixed support 100, and the distal end of the lance support is installed on the fixed support 100 Is lifted and lowered by the hoist wire 120 wound or unwound from the hoist motor 130 to adjust the vertical inclination angle of the injection lance 300. In addition to the hoist motor 130 and the hoist wire 120, the configuration for adjusting the lance inclination angle may be realized by an electric motor for reciprocating a piston of a hydraulic or pneumatic cylinder and its associated mechanism, A sensor for detecting the inclination angle may be additionally provided.

The gas supply tube 310 is connected to a compression pump (composed of a motor and a solenoid valve), not shown, and constitutes a gas supply unit for supplying an inert gas into the injection lance 300. The compression pump is filled with a high-pressure inert gas to provide a gas at a predetermined pressure. As the inert gas, argon (Ar) or nitrogen (N) gas may be used. The gas supply tube 310 is connected to the injection lance 300 so as to be movable forward and backward together with the injection lance 300.

The lance carrier 220 and the lance driving motor 210 constitute a lance forward / backward driving unit for moving the lance 300 in the forward and backward directions about the lance support 200. That is, the lance carrier 220 moves forward and backward along the rails of the lance support 200 by driving the drive motor 210 while the injection lance 300 is fastened to the lance support 200. In addition to the lance carrier 220 and the drive motor 210, the injection lance 300 may be configured as a compression pump (motor), a solenoid valve, or a linear motor for compressing oil pressure or air pressure, , A sensor for detecting the forward or backward position or distance may be additionally provided.

FIG. 5 is a side view showing a slag leakage preventing device according to an embodiment of the present invention, and FIG. 6 is a front view showing a lance rotating structure of FIG. In the present invention, the lance rotation unit is provided with the lance inclination angle adjusting unit and the lance forward and backward driving unit and rotates the injection lance in the longitudinal direction to the left and right.

5, the rotary motor 400 is coupled to the lower side of the lance carrier 220 and the rotary motor 400 is connected to the rear end of the injection lance 300 by the chain gear 410. At this time, though not shown, the rotation motor 400 is provided with a solenoid valve and a sensor for controlling the rotation direction and the rotation angle of the motor. When the lance rotation part is fastened to the lance carrier 220, when the injection lance 300 moves back and forth, the lance rotation part also moves together.

When the rotary motor 400 is driven at a predetermined angle by the lance rotation unit having such a configuration, the injection lance 300 is also rotated by the chain gear 410 connected to the rotary motor 400. That is, as shown in FIG. 6, the lance rotation unit rotates the injection lance 300 at right angles to the left and right at a predetermined inclination angle with respect to the longitudinal direction. The injection lance 300 is formed of a hollow pipe structure having a predetermined length. When such a pipe structure enters the inside of the converter and stays for a long time, the molten steel strikes downward due to the high temperature of the molten steel. Therefore, when the injection lance 300 is rotated at a constant cycle as in the present invention, the direction of the load is changed, thereby preventing the injection lance 300 from falling down.

In this case, the rotation period may be predetermined according to the material of the injection lance 300 or the temperature inside the converter, and the rotation angle is preferably set to rotate at an angle of 15 to 30 degrees in the left or right direction. When rotating at an angle of less than 15 degrees, there is a fear that the narrowing angle may not be prevented, and when the nozzle is rotated at an angle exceeding 30 degrees, the direction of the nozzle is simultaneously rotated. Therefore, There is a concern.

Meanwhile, although not shown, the gas supply unit, the lance inclination angle adjusting unit, the lance forward / backward driving unit, and the lance rotating unit are controlled by separate control units, and the slag leakage preventing device is driven.

FIG. 7 is a cross-sectional view showing the nozzle structure of the tip end of the injection lance according to the present invention, schematically illustrating the internal structure of the nozzle of FIG. 4, and FIG. 8 is a conceptual view showing the injection path of the inert gas by the nozzle of FIG. to be.

The pressure, speed and injection range of the finally discharged inert gas by the nozzle 500 fastened to the tip of the injection lance 300 are controlled. Particularly, in the present invention, the injection direction of the inert gas (i.e., rotation) do. 7, the nozzle 500 of the present invention includes an outer body 510 that forms a space 510a therein, an inner body 520 that is coupled to an inner space of the outer body 510, And fastening means 530 for fastening the inner body 520 to the outer body 510 constitute a module.

Specifically, the outer body 510 has a hollow cylindrical shape and defines a space 510a through which inert gas moves. Particularly, the space portion 510a of the outer body 510 is coupled with the inner body 520 to form a spiral flow path 522. The inner body 520 has a size such that it can be inserted into the space 510a of the outer body 510 and is spaced apart from the inner wall surface of the outer body 510 and the outer wall surface of the inner body 520 A flow path is formed. In particular, a plurality of projections 521 are spirally formed on the outer circumferential surface of the inner body 520 along the direction in which the inert gas moves to form the spiral flow path 522.

The fastening means 530 includes a fastening protrusion 531 projecting upward and downward from the central axis of the inner body 520 and a fastening protrusion 531 fastened to the inner wall of the outer body 510 while the center thereof is connected to the end of the fastening protrusion 531, And a circular coupling rib 532 to be fastened. That is, the fastening protrusions 531 are connected to the upper and lower sides of the inner body 520, and a pair of fastening ribs 532 connected to the fastening protrusions 531 are formed in the grooves formed in the inner wall of the outer body 510 So that the inner body 520 is positioned in the space 510a of the outer body 510. Further, the circular fastening ribs 532 are formed with holes 532a through which the inert gas passes.

The inert gas passing through the space 510a between the outer body 510 and the inner body 520 is discharged while being spirally rotated by the nozzle 500 having the above-described structure. The inert gas discharged in a helical manner rotates even after being discharged to the outside of the nozzle 500, and collides with the slag or molten steel while inclining the surface. 8, the inert gas Ar strikes the surface of the slag S or the molten steel M, thereby changing the direction of advance in the radial direction, effectively pushing out the slag, and at the same time, the repulsive force does not act, Is not scattered.

Meanwhile, in the embodiment of the present invention, the spiral flow path 522 formed in the nozzle is formed by spiral protrusions formed on the outer circumferential surface of the inner body. However, the present invention is not limited to this, But may be formed by spiral protrusions formed on the wall surface. That is, guide members having various structures for forming the helical flow path can be installed in the space portion of the outer body.

Also, the inner body 520 is fastened to the outer body 510 so as to be rotatable about the fastening protrusion 531 in accordance with the flow of the inert gas. That is, rotating means such as a rolling bearing may be interposed between the connecting portion of the inner body 520 and the fastening protrusion 531, or between the groove of the outer body 510 and the edge of the fastening rib 532. Accordingly, when the inert gas passes, the protrusion 521 of the inner body 520 is spirally formed, so that the inner body 520 can be rotated. Such rotation of the inner body changes the discharging position of the inert gas discharged along each helical flow path, so that an inert gas of a more uniform density can be discharged to the outside.

FIGS. 9 to 11 are views showing various modified examples of the injection nozzle and the slag prevention structure according to the embodiment of the present invention, respectively showing the diffusion type nozzle, the general type nozzle, the concentrated type nozzle and the slag prevention structure.

As shown in these drawings, the injection nozzle 500 according to the embodiment of the present invention is formed such that the diameter of the helical projections (that is, the width of the helical flow passage) gradually increases toward the discharge port as shown in FIG. 9, The diameter of the helical projections 521 may be formed to be the same or the diameter of the helical projections 521 may gradually decrease toward the discharge port as shown in FIG.

Specifically, when the diameter of the protrusion 521 increases toward the discharge port as shown in FIG. 9A, the depth of the spiral flow path 522 becomes deep. The nozzle 500 having such a structure is characterized in that the inert gas is injected into a relatively large area while pushing the slag with a weak spraying force as shown in (b). Therefore, it is preferable that the injection nozzle 500 having a structure in which the diameter of the spiral protrusion 521 is increased is applied to molten steel exhibiting a relatively weak viscosity.

10A, when the protrusions 521 are formed to have the same diameter, the depth of the spiral flow path becomes the same. As shown in FIG. 10B, the inert gas is injected into the basic region with a normal spraying force. Therefore, the injection nozzle 500 having a structure in which the diameter of the helical projections 521 is the same can be applied to molten steel having general viscosity.

In addition, when the diameter of the projection 521 increases toward the discharge port as shown in Fig. 11A, the depth of the spiral flow path 522 becomes shallow. The nozzle 500 having such a structure is characterized in that the inert gas is injected into a narrow region as shown in (b), but the slag is pushed out with a relatively strong spraying force. Therefore, it is preferable that the injection nozzle 500 having a structure in which the diameter of the helical projections 521 is reduced is applied to molten steel exhibiting a relatively strong viscosity.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: fixed support 200: lance support
210: lance drive motor 220: lance carrier
300: injection lance 310: gas supply tube
400: rotation motor 410: chain gear
500: nozzle 510: outer body
520: inner body 530: fastening means

Claims (7)

A pipe structure having one side end connected to the inert gas supply tube, a passage for moving the inert gas therein, and an opening for discharging the inert gas on the other end side; And
An outer body which is fastened to the other opening of the pipe structure and which has a hollow cylindrical shape and which forms a space portion therein; a plurality of projections formed along the outer circumferential surface of the inner body to form a spiral flow path between the inner walls of the outer body; And a hole through which the inert gas penetrates, wherein the central portion is connected to the fastening protrusion, and the edge is formed in a circular shape which is fitted into the groove formed in the inner wall of the outer body, And a nozzle module for making the inert gas spirally rotate while discharging the inert gas,
Wherein the inner body is fastened to the outer body so as to be rotatable about the fastening protrusion in accordance with the flow of the inert gas. delete The spiral flow path according to claim 1,
Wherein the width of the gas injection lance is set so that the width increases or decreases toward the discharge port. delete delete A gas injection lance according to any one of claims 1 to 3;
A gas supply unit for supplying an inert gas to the injection lance;
A lance inclination angle adjuster for adjusting a vertical inclination angle of the injection lance;
A lance advance / retreat driving unit for moving the injection lances from the support to the front and rear;
A lance rotation unit for rotating the injection lance about the longitudinal direction; And
And a control unit for controlling the gas supply unit, the lance inclination angle adjusting unit, the lance forward / rearward driving unit, and the lance rotation unit,
Wherein the injection lance is reciprocally rotated by a predetermined angle to the left and right sides in the longitudinal direction by the control unit. 7. The apparatus according to claim 6,
And the injection lance is reciprocally rotated in the left-right direction at a rotation angle of 15 to 30 degrees.





KR1020140192214A 2013-12-30 2014-12-29 Gas Shooting Lance having Rotatable Injecting Nozzle and Slag out-flow Prevention Apparatus having the Same KR101669138B1 (en)

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KR102171167B1 (en) * 2018-08-28 2020-10-28 주식회사 포스코 Device for removing adhered coal in hopper
CN110042187B (en) * 2019-05-30 2024-05-28 苏州东大汉森冶金实业有限公司 Device for modifying slag powder spraying and separating slag steel during converter tapping and use method

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KR930006046Y1 (en) * 1991-12-30 1993-09-13 포항종합제철 주식회사 Apparatus for preventing slag mixing
KR950009438B1 (en) * 1992-12-30 1995-08-22 포항종합제철주식회사 Tapping method of converter
KR970005382B1 (en) * 1994-12-28 1997-04-15 포항종합제철 주식회사 The method and the device of slag mixing check with converter
JPH11209816A (en) * 1998-01-21 1999-08-03 Nippon Steel Corp Method for preventing flow-out of slag from steel tapping hole of converter
KR20020051964A (en) * 2000-12-21 2002-07-02 이구택 Apparatus for cutting slag from molten steel in converter

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