JPH0285314A - Device for applying agent for preventing base metal deposition - Google Patents

Abstract

PURPOSE:To set the title device for a lance to be inserted into molten metal even in high-temp. environment and to reduce trouble due to the splash of molten metal by making a nozzle movable to a coating position facing the lance and a retreating position. CONSTITUTION:A sublance 7 is lowered, and dipped in molten steel. At this time, air is sent to an air cylinder 16 of a coating device 10 to slide a nozzle header 15 in a protective case 12 along two rails 14, and allowed it to protrude from a gate 13 provided with a movable lid 11. The lance 7 is positioned at the center of the three nozzles 20 arranged toward the surface of the lance 17 in the U-shaped opening of the header 15 facing the lance 7. A deposition preventing agent 22 and a high-pressure gas 21 are supplied to each nozzle 20 as the lance 7 lowers, and the agent 22 is applied. When the lance 7 is coated with the agent 22 to a specified length from its tip, the supply of the agent 22 and gas 21 is stopped, and the header 15 is housed in the retreating position in the case 12.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a base metal adhesion prevention agent coating device, and in particular to a device for applying a base metal adhesion prevention agent, and in particular to a device for applying a base metal adhesion prevention agent to a lance inserted into molten metal in a container such as a converter. The present invention relates to a coating device for an anti-adhesion agent to prevent adhesion.

[Prior art] Conventionally, molten metal adheres to converter lances for oxygen injection and sub-lances for temperature measurement sampling due to blown up molten steel droplets and immersion in the molten metal surface, and the metal grows each time it is used. Therefore, sub-lances in particular must be frequently immersed in the hot water surface, resulting in deformation of the lance and problems with water leakage, which shortens the life of the lance, and blowing lances, which cannot be removed from the lance insertion hole, resulting in problems with converter operation. Before insertion, it was necessary to remove the previous metal and apply a release agent to facilitate removal.

In addition, since the above-mentioned stripping work and coating work environment is a high-temperature environment, in order to ensure the safety of workers, reduce labor, and shorten working time, we
2-8485 etc. Te'! A device for automatically applying a lI release agent is known.

[Problems to be Solved by the Invention] However, in the coating device as disclosed in JP-A No. 52-120903, the lance insertion step and the release agent application step are completed in one step, so the coating device is installed near the lance insertion hole. However, from the lance insertion hole, hot air due to oxygen injection, molten steel droplets, and dust are blown up, and the environment near the insertion hole is quite high, especially the nozzle of the coating equipment and the coating agent. It is clear that problems such as deformation and blockage occur in supply pipes due to molten steel splashes and high temperatures.

Similarly, in Japanese Patent Publication No. 62-8485, the coating device is installed near the lance insertion hole, and the blockage of the coating agent supply pipe is cleaned with cleaning water, but T8 steel droplets at the tip of the nozzle are removed. Deformation due to heat, dust, and heat is unavoidable.

In addition, the filler metal adhesion prevention agent used in this application is a slurry-like mixture of graphite powder and glue, and is a metal adhesion prevention agent that easily solidifies when heated and has a high clogging property. However, the nozzle part became too hot to use.

Therefore, the present invention aims to provide a coating device that is easy to install even in high-temperature environments, has fewer failures even when molten steel splashes or dust blows up, and can be used even with highly occlusive coating agents. .

[Means for solving the problem] In the base metal adhesion prevention agent coating device according to the first invention of the present invention,
In a metal adhesion prevention agent coating device that sprays a slurry-like adhesion prevention agent to prevent metal adhesion onto a lance inserted into molten metal, the outer peripheral surface of the lance at a position in the middle of the lance insertion path. a nozzle header that is movable forwards and backwards and has a plurality of nozzles oriented in a plurality of directions around the lance; a coating position in which each nozzle is opposed to the lance; and a retreat position in which each nozzle is moved away from the lance. and a drive device for moving the nozzle header between the nozzle header and the nozzle header.

A metal adhesion prevention agent applicator according to a second invention is the metal adhesion prevention agent applicator according to the first invention, further comprising a protective case that accommodates the nozzle header therein in the retracted position. .

In the base metal adhesion prevention agent coating device according to the third invention, in the base metal adhesion prevention agent application device according to the second invention, a cold air blower for making the inside of the protective case a higher pressure than the outside and cooling it. It is equipped with the following.

In the base metal adhesion prevention agent coating device according to a fourth invention, in the base metal adhesion prevention agent application device according to any one of the first to third inventions, the nozzle is configured to apply high-velocity gas to a liquid. This is a gas atomization nozzle that collides with the gas to atomize it.

In the base metal adhesion prevention agent application device according to the fifth invention, a slurry-like adhesion prevention agent for preventing base metal adhesion is sprayed onto a lance inserted into molten metal. The agent applicator includes: a nozzle header including a plurality of nozzles directed toward the outer peripheral surface of the lance from a plurality of directions around the lance; and a moving device for moving the nozzle header in the longitudinal direction of the lance. It is something that

A base metal adhesion prevention agent applicator according to a sixth aspect of the present invention is the base metal adhesion prevention agent applicator according to the fifth aspect, in which a plurality of the nozzle headers are arranged in the longitudinal direction of the lance.

[Function] In the present invention, the nozzle header provided with the nozzle is movable forward and backward and moves to the retracted position when not in use, so it can be installed near the lance insertion hole in a high temperature environment.

In addition, it is equipped with a protective case that stores the evacuated nozzle header, and since cooled air is supplied to the protective case to generate lift pressure, hot air and lances that blow up from the insertion hole easily enter. Can not.

In addition, the nozzle is a gas atomization nozzle that collides high-velocity gas with the liquid to atomize it, so even if it is a slurry-like coating agent that is highly clogging in a high-temperature environment, there will be less clogging and suspension. Even the fine particles that are deposited do not settle.

In addition, since the nozzle is moved in the longitudinal direction of the waiting lance for coating, the lance can be quickly replaced.If multiple nozzles are provided, coating time can be shortened and double coating can ensure reliable coating. It becomes possible.

[Example 7] An example in which the present invention is applied to a sublance will be described below.

Fig. 1 is an explanatory diagram showing the overall configuration, Fig. 2 is a top view including a partial cross section of the device of the present invention, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a side view of Fig. 3. , FIG. 5 is a cross-sectional view of the nozzle. The same reference numerals in the figures indicate the same.

In FIG. 1, there is molten steel 2 inside a converter furnace body 1,
An OG hood 4 for exhaust gas recovery is arranged above the opening of the furnace body 1, and a main lance insertion hole 5 and a sub-lance insertion hole 6 are opened in the hood 4 above the furnace body 1 opening. Oxygen is blown into the molten steel 2 from the main lance 3 inserted into the body 1. Now, the sub-lance 7 has a probe 9 attached to the tip of the sub-lance 7 by a probe attaching/detaching device 8 located at the upper part in the insertion direction of the sub-lance 7, and a coating agent is applied to the sub-lance 7 by a base metal adhesion prevention agent applicator 1o located below the probe detaching device 8. is applied and inserted into the furnace body 1 through the sublance insertion hole 6.

As shown in Figure 2.3.4, the metal adhesion prevention agent applicator io has a box-shaped protective case 12 made of a durable heat-insulating material that blocks high temperatures, and has a box-shaped protective case 12 facing the sub-lance 7. On the side, there is a nozzle header inlet/outlet 1 covered by a movable lid 11.
3 is placed.

Two rails 14 parallel to the longitudinal direction extend across the inner surface of the upper plate of the protective case 12, and a nozzle header 15 is installed so as to be slidable along the rails 14.

An air cylinder 16 inside the protective case 12 allows the ladder 15 to be slid in the longitudinal direction to the nozzle so that it can be projected and accommodated.

The nozzle rudder 15 opens in a U-shape toward the sub-lance 7, and three nozzles 2° are arranged toward the surface of the sub-lance 7 so that they form equal angles with the sub-lance 7 as the center when projected. . The anti-adhesion agent and pressurized air are supplied to each nozzle 20 from an anti-adhesion agent tank 17 and a pressurized air tank 18 through an anti-adhesion agent piping 23 and a pressurized air piping 24 made of flexible hoses.

The anti-adhesion agent used in this example was a slurry-like metal adhesion prevention agent consisting of fine graphite powder and an organic and inorganic water-soluble binder.

In addition, cold air 19 cooled by a cooler (not shown) is sent into the protective case 12 to cool the inside of the case and create lateral pressure, so that hot air, lances, etc. blown up from the insertion hole are easily removed. It prevents intrusion.

As shown in FIG. 5, the nozzle 20 uses a gas 111I exposure nozzle that collides a high-velocity gas 21 with the anti-adhesion agent 22 to expose it to OJ. If 17 is tilted to a high position, it will be supplied by its own weight and the suction force of the gas flow. This made it possible to atomize a highly viscous slurry fluid.

First, the probe 9 is attached to the tip of the sub-lance 7 using the probe attachment/detachment device 8 . Until this time, the nozzle ivy 15 of the base metal adhesion prevention agent applicator 10 is housed inside the protective case 12. After the probe 9 is attached, the sublance 7 is lowered and immersed in the molten steel 2 inside the furnace body 1. At this time, air is supplied to the air cylinder 14 of the metal adhesion prevention agent application device 10, and the air is As the cylinder 14 expands, the nozzle header 15 is projected. The sub-lance 7 is positioned at the center of the three nozzles 20 and protrudes to a predetermined application position, and as the sub-lance 7 descends, the anti-adhesion agent 22 and high-pressure gas 21 are fed to the three nozzles 20. Apply. When coating is completed to a predetermined length from the tip of the sublance 7, the anti-adhesion agent 22 and high pressure gas 21 supplied to the nozzle 20 are stopped, and the nozzle header 15 is
is housed in the retracted position inside the protective case 12.

FIG. 6 is an explanatory view showing the overall configuration in which the base metal adhesion prevention agent applicator of FIGS. 2 to 4 is arranged movably in the longitudinal direction of the lance. In the figure, the lance 7 is in a standby state, and two base metal adhesion prevention agent applicators 10 arranged in the longitudinal direction of the lance 7 are moved by a moving device @31 that moves on a rail 31 arranged parallel to the lance 7. It is adapted to move upward in the longitudinal direction from just below the probe attaching/detaching device 8.

Now, the lance 7 with the probe 9 attached thereto is suspended in a standby state, and is moved upward from the probe 9 position by two metal adhesion prevention agent applicators 10 attached to the υ motion device 31. It will be applied while doing so. At this time, if the metal adhesion prevention agent applicator 10 disposed above is installed in advance at a position half of the distance to be applied to the lance 7, the moving path J11 of the moving device 31 can be moved halfway, Needless to say, it can save time. Further, since the ivy 15 is movable to the nozzle equipped with the nozzle 20, it is possible to easily position the lance 7 to the center of each nozzle during application. This is one of the 10 characteristics.

As explained above, the nozzle header equipped with the nozzle is movable and moves to the retracted position when not in use, so it can be installed near the lance insertion hole in a high-temperature environment, and molten steel spray and dust can be removed from the insertion hole. Even if it blows up to the outside, it does not directly reach the nozzle header, so it is possible to obtain a coating device with fewer failures. Furthermore, since the nozzle header equipped with the nozzle is movable, positioning on the lance is easy. In addition, it is equipped with a protective case that stores the evacuated nozzle header, and cooled air is supplied to the protective case to create a higher pressure than the outside, making it easy for hot air and lances to blow up from the insertion hole. cannot be infiltrated. Further, since the nozzle is a gas atomization nozzle that causes high-velocity gas to collide with the liquid and atomize it, it can be used even with highly clogging materials such as slurry-like coating agents.

Furthermore, if the device is installed in a movable manner, it can be applied to lances that are on standby, making it possible to quickly replace the lances, and when equipped with multiple nozzles, coating time can be shortened and double coating can be performed. This enables reliable application.

[Effects of the Invention] As explained above, in the present invention, the nozzle header equipped with the nozzle is movable and moves to the retracted position when not in use, so it can be installed near the lance insertion hole in a high temperature environment. Even if molten steel splashes rise up to the outside of the insertion hole, they do not directly reach the nozzle header, so it is possible to obtain a coating device with fewer failures. Moreover, since the nozzle header provided with the nozzle is movable, positioning on the lance is easy. In addition, it is equipped with a protective case that stores the evacuated nozzle header, and cooled air is supplied to the protective case to create a higher pressure than the outside, making it easy for hot air and lances to blow up from the insertion hole. cannot be infiltrated. In addition, since the nozzle is a gas spraying nozzle that causes high-velocity gas to collide with the liquid and atomize it, it is possible to obtain a coating device with less clogging even in a high-temperature environment.

Additionally, if the device is installed in a movable manner,
It can also be applied to a middle lance, allowing quick replacement of the lance, and when a plurality of the nozzles are provided, reliable coating can be achieved by shortening the coating time and double coating.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration including a device according to an embodiment of the present invention, FIG. 2 is a top view including a partial cross section of the device of the present invention, and FIG. 3 is a front view of FIG. Figure 4 is a side view of Figure 3.
FIG. 5 is a cross-sectional view of the nozzle, and FIG. 6 is an explanatory diagram showing another overall configuration including the device according to an embodiment of the present invention. In the figure, 10 is a base metal adhesion prevention agent applicator, 1 is a movable lid, 12 is a protective case, 13 is a nozzle header entrance and exit, 1
4 is the rail, 15 is the ivy to the nozzle, 16 is the air cylinder, 17 is the anti-adhesive agent tank, 18 is the pressurized air tank, 1
9 Reifu, 20 a nozzle, 21 a gas, 22 an anti-adhesive agent, 23 an anti-adhesive pipe, 24 a pressurized air pipe, and 31 a moving device. Agent: Patent Attorney Tadashi Sato Figure 1 Figure 4 Figure 1/2

Claims (6)

[Claims] (1) In a metal adhesion prevention agent application device that sprays a slurry-like adhesion prevention agent for preventing metal adhesion onto a lance inserted into molten metal, the a nozzle header that is movable forward and backward and has a plurality of nozzles oriented toward the outer peripheral surface of the lance from a plurality of directions around the lance; a coating position in which each of the nozzles is opposed to the lance; A drive device for moving the nozzle header between the nozzle header and the retracted position. (2) The metal adhesion prevention agent coating device according to claim 1, further comprising a protective case that accommodates the nozzle header therein in the retracted position. (3) The base metal adhesion prevention agent coating device according to claim 2, further comprising a cold air blower for making the inside of the protective case a higher pressure than the outside and cooling it. Agent applicator. (4) The metal adhesion prevention agent coating device according to any one of claims 1 to 3, wherein the nozzle is a gas atomization nozzle that causes high-velocity gas to collide with the slurry to atomize it. Metal adhesion prevention agent applicator. (5) In a base metal adhesion prevention agent coating device that sprays a slurry-like anti-adhesion agent for preventing base metal from adhering to a lance inserted into molten metal, the lance is directed toward the outer peripheral surface of the lance. A metal adhesion prevention agent coating device comprising: a nozzle header having a plurality of nozzles directed from a plurality of surrounding directions; and a moving device for moving the nozzle header in the longitudinal direction of the lance. (6) The metal adhesion prevention agent coating device according to claim 5, wherein a plurality of the nozzle headers are arranged in the longitudinal direction of the lance.