JPH0277515A - Method and apparatus for repairing tapping hole in metal refining vessel - Google Patents

Abstract

PURPOSE:To quickly and safely repair a tapping hole by rotating a lance inserted into the tapping hole around the extended shaft and injecting fire resistant powder and easy-oxidized metal powder into flame from a nozzle arranged at side face of tip part thereof. CONSTITUTION:A carriage 2 mounting the lance 3 providing the nozzle 13 at the side face of the tip part thereof is advanced/retreated on rail 10 through a driving device 20 and set at the prescribed position to a tapping hole 5 in a converter 4. Further, the lance 3 is tilted with a hydraulic cylinder 14 to coincide with the angle of the tapping hole 5 to the horizontal plane. Successively, by tilting the converter 4 around the tilting axial 0, the tapping hole 5 is positioned to the lance 3, to confirm it with a TV camera 8 and a monitor TV 9. Successively, the lance 3 is inserted into the tapping hole 5, and the mixed material of the fire resistant powder and easy- oxidized metal powder is injected in the flame with the combustible gas and combustion-aiding gas from the nozzle 13 to execute thermal-spray to the wall of the tapping hole 5. Together with this, the lance 3 is shifted to front/rear direction with an advancing/retreating driving device 16 while rotating this around the extended shaft with an auto-driving device 15, to execute repair of broken position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for quickly repairing the damaged part of a tapping refractory in a metal refining vessel such as a converter using hot, wet or semi-dry methods and flame spraying. and its apparatus.

[Prior Art] When repairing the tapping hole of a metal refining vessel, the following methods 1) and 2) have been conventionally used for repairing the tapping refractory of a converter.

l) Method 1 called so-called perforation 1 For example, JP-A No. 6
2-284008, after tapping the converter, a repair mold is attached to the tapping hole, the gap between the furnace wall and the steel is filled by a method such as pouring repair material from inside the furnace, and then the furnace is opened. Method 62 of starting refining after drying and sintering the repair material using its own residual heat or burner flame, etc.
) Spraying method, for example, JP-A-62-29741
As shown in 2, after tapping, a lance is inserted into the tap hole for spraying, so-called wet spraying is a method in which material containing moisture is sprayed, and the repair layer after repair work is heated and dried.

As described above, the repair work for the tapping hole is carried out by interrupting the refining after tapping the tap water, and the repair layer needs to be dried by heating after the work, so the repair takes a long time. Furthermore, the obtained repair layer is a dry body of amorphous refractory, and is affected by the low melting point binder, etc., so its durability is low.

[Problems to be Solved by the Invention J Problems in the conventional method of repairing the tapping hole of a metal refining vessel such as a converter as described above include the following.

■The repair material is a monolithic refractory, and requires a long period of drying and baking before the repair layer solidifies.

■When constructing irregular-shaped materials, a casting mold called a core is installed, but if it is performed hot, the work becomes extremely hot, which is not desirable from a safety standpoint.

■The time from the start of repair to start-up is long, resulting in a decrease in productivity.

■Durability is low because it is constructed using irregularly shaped materials.

■With the method of spraying as described in JP-A-62-297412, even if the position at which the rotation of the converter is stopped is finely adjusted using a hand-held angle gauge, in reality the position of the tap hole is always the same. It is difficult to align the lance with the axis of the tap hole, and it is necessary to adjust the lance angle each time. It takes too much time to prepare.

The present invention aims to provide a method and apparatus for repairing a tap hole of a metal smelting vessel, which overcomes the disadvantages of the prior art.

[Means for Solving the Problems 1 (1) Method of the Invention The present invention hot-repairs the tapping hole of a metal smelting vessel, improves its durability, prevents a decrease in productivity due to the repair, and improves safety. It is a means of repairing refractories that improves their performance. In other words, in the present invention, a lance having a nozzle on the side surface of the tip and rotating around the long axis of the lance is inserted into a tapping hole, and a material made of a mixture of refractory powder and easily oxidizable metal powder is sprayed through the nozzle into a flammable gas. and combustion-supporting gas are ejected into the flame and sprayed onto the wall of the tapping hole.

The method of the present invention is a method of repairing metal m
S Can be applied when the container is a converter, and repair work is carried out during the operation of the converter, at which time the inner diameter of the tapping hole is 10
It is 0 to 300 mm.

In addition, in order to repair the tap hole wall quickly and to a uniform thickness, the axis of the thermal spray repair lance is aligned with the tap hole axis, and the lance is rotated around the axis and moved forward and backward during construction. . When performing this operation, the tap hole is held in a fixed position in order to align the axis of the tap hole with the axis of the lance. For this reason, the tilting and stopping of the metal refining container is performed while confirming the exact position of the metal refining container using a fixed television camera.

Next, the case of a converter will be explained in more detail. Hot metal or hot metal and scrap are charged into a converter and shaped into a furnace, and oxygen or oxygen and inert gas are mixed from the top blowing lance or the bottom tuyere, or both the top blowing lance and the bottom tuyere, respectively. During this furnace tilting operation in which gas is injected for blowing, a fixed point is set on the converter body so that the axis of the thermal spray repair lance matches the axis of the converter tap hole, and this fixed point is monitored with a television camera. is photographed, the image is received on a monitor TV, and the semi-fixed position of the screen IIi on the monitor TV is confirmed, the tilting position is stopped at the fixed position, the axes of the tap hole and the lance are aligned, and the lance is inserted into the tap hole.

Next, the repair refractory powder is discharged together with flame from the repair lance tip nozzle to melt the eroded part of the hot-water refractory.
Repair. Furthermore, while rotating and driving the lance forward and backward, the wall of the large object in the tapping hole is repaired to a uniform thickness.

In addition, if there is some time available during operation in a converter, immediately insert the lance for thermal spray repair into the center of the tap hole in the converter in an empty state after tapping the steel.

There is no problem with carrying out thermal spray repair work.

(2) Apparatus of the present invention As an apparatus for suitably implementing the method of the present invention, there are two types of lances: (1) a lance with a nozzle on the side surface of the tip, which rotates around the long axis of the lance and inserts and extracts the tip into the tapping hole; (2) a lance equipped with the lance; A repair equipment trolley that runs on a placing rail to move the tip of the lance to the inside of the easy hole, and is equipped with means for adjusting the inclination angle of the lance axis to align the axis of the lance with the axis of the tapping hole.

■ Confirmation means for checking that the axis of the lance matches the axis of the tapping hole; ■ Means for adjusting the traveling of the repair equipment cart and the inclination angle of the lance, and controlling the forward and backward movement and rotation of the lance, as well as a repair mixture;
An operation panel for controlling the supply/stop of combustion-supporting gas and combustible gas.

It was composed of

Also, as an apparatus for suitably implementing the method of the present invention.

■A lance with a nozzle on the side of the tip that rotates around the long axis of the lance and inserts and extracts the tip into the tap hole.

■A repair equipment trolley on which a lance is placed and runs on a rail to move the tip of the lance into the tapping hole, and a repair equipment trolley that moves on a rail placed on the concentric circumference of the tilting axis of the O metal refining vessel. A mobile trolley with vertical rails.

@ Confirmation means to confirm that the axis of the lance matches the axis of the tapping hole.

■An operation panel that controls the traveling of the repair equipment trolley, the movement of the mobile trolley, the forward and backward movement and rotation of the lance, and also controls the supply and stop of the repair mixture, combustion-supporting gas, and combustible gas.

It may be composed of

[Effect 1] Since the diameter of the tap hole in the converter is usually about 100 to 300 mm, the spraying distance is short, and therefore the spraying flame needs to be very short. Therefore, #
Spraying the material mixed with 5 oxidizable metal powder, which turns into a refractory oxide.

It was decided that flammable gases such as propane and acetylene and combustion-supporting gases such as oxygen would be ejected into the flame. As a result, the spraying distance can be shortened by the addition of the combustion flame of the combustible gas and the oxidation heat of the metal powder, and suitable repairs can be easily carried out in a short period of time.

However, in order to apply the thermal spray repair method according to the present invention to an actual furnace, the above-mentioned spraying requires a thermal spray repair lance that is thick enough to supply appropriate amounts of material, combustion-supporting gas, combustion gas, and lance cooling water. The actual situation is that an outer diameter of approximately 50 mm or more is required. Therefore, as shown in Figure 9, which shows the relationship between the spraying distance and the porosity of the adhesion layer when thermal spray repair is carried out in the tap hole of the converter, the porosity of the adhesion layer becomes more than 20% when the spraying distance is less than 25 mm. In terms of durability as a refractory, it lacks practicality. In this way, the spraying distance is 25
This is because if it is less than mm, the supplied spray will not produce a flame that is sufficient to burn the oxidizable metal powder in the material and fuse the refractory powder.

Also, when using the same nozzle, the spraying distance is 125mm.
In the case where the porosity of the adhesion layer exceeds 20%, the porosity of the adhesion layer becomes more than 20%, which is also undesirable as the adhesion layer lacks practicality. When using a nozzle, if the spraying distance is not long, the flame temperature will drop, flame scattering will occur, and the flight speed of the sprayed material will decrease, making it impossible to obtain a good adhesion layer. .

From the above, the flame injection repair method for a converter tap hole according to the present invention can be applied to a tap hole with an inner wall diameter of 100 to 300 mm, and the optimum hole diameter is 150 to 250 mm.
It is in the range of mm.

According to the device of the present invention, a confirmation means is provided for confirming that the lance shaft and the tapping hole axis match, and a means for adjusting the lance inclination angle is further provided, or the lance axis is adjusted to the tapping hole at any position on the converter inclination. Since the movable cart is moved on a rail disposed on the concentric circumference of the converter tilting shaft so as to match the axis, it is possible to tilt the converter, move the movable cart, or adjust the lance inclination angle. The lance axis and the tapping hole axis can be easily matched by operation. Therefore, the conventional problem of taking too much time to prepare for repairs can be solved, and repairs can be carried out safely and quickly.

[Example] (1) Repair method An example of repairing a hot water tapping refractory of a 180 ton converter using the method of the present invention is listed below.

(Example 1) FIGS. 1 and 2 are explanatory diagrams of an example. The thermal spraying lance 3 is mounted on the thermal spraying repair equipment trolley 2.

The thermal spray repair equipment operation panel 1 controls the forward and backward movement of one truck 2, the forward and backward movement and rotation of the lance 3, and the supply and stop of the reparative mixture, combustible gas, and combustible gas.

In advance, a TV camera 8 fixedly installed indoors on the side of the tap hole of the converter 4 photographs the outlet of the tap hole 5, and this image is received on the monitor television 9. Confirm that the center of the screen is the position where the respective axes of the tapping hole 5 and the thermal spraying lance 3 match.

From the converter 4, ordinary steel with a tapping temperature of 1,710°C and a carbon content of 0.04% is tapped, and after the residual slag is discharged, the converter is tilted vertically and the central part of the tapping hole 5 is tapped. is monitor tv 9
The tilting of the converter was stopped when the screen reached the center of the screen.

Next, the lance 3 is inserted into the tapping hole 5, and immediately the oxygen for thermal spray repair: 25ONrrr'/hrC3)+13:2
ONrn'/hr is supplied to the lance and a flame is formed in the tapping hole, then.

N2 gas: 5ONrn'/hr Repair mixture: 200Kg/hr was supplied (Figure 2).The repair mixture at this time was: MgO with a maximum particle size of 1000um: 63% by weight g2O3
・34% by weight 5i02, Cab, Fe2O3 total = 3 times % Aluminum particles with an average particle size of lOOμm: 17% by weight on the outside. At the same time as the repair starts, the spraying lance is rotated around the long axis of the lance in the inner circumferential direction of the tap hole, and while moving parallel to the tap hole axis toward the inside and outside of the converter furnace, The interior walls were uniformly repaired. Before repair, the tapping hole diameter was approximately 180 mm and the length was approximately 1 m.

The repair was carried out for about 6 minutes until the diameter of the tapping hole became about 160 mm. After repairing in this way, immediately carry out the next blowing process, and blow the hole for 20 minutes until the diameter of the outlet hole reaches the diameter before the repair.
We were able to conduct heat operations.

(Example 2) FIG. 3 shows a situation in which the hot-water refractories of a converter are repaired by thermal spraying during converter blowing.

In the converter shown in Example 1, after charging a specified amount of hot metal, the furnace was molded and blowing was started.
After finely adjusting the tilting of the converter so that the center of the converter tap hole was located in the center of the monitor TV screen and stopping the furnace, a thermal spraying lance was inserted into the tap hole, and the thermal spray repair began immediately. Conditions regarding thermal spray repair at this time are the same as in Example 1 above. In this way, the tapping hole was repaired during converter blowing.

After about 30 minutes of blowing, the molten steel was tapped out from the repaired tapping hole. The durability of the repair layer at this time was 20 heats.

By repairing the converter tapping hole refractory by thermal spraying during blowing in this way, it is possible to omit the operation stop time for tapping repair, and this embodiment significantly improves the productivity of the converter. I was able to do that. Furthermore, we were able to eliminate the high-temperature work that had previously been done for hot water repair, improving the safety of this work.

(2) Repair device (Embodiment 1) An embodiment of the device of the present invention is shown in FIG. Axis of hole 5! ! It is placed on a repair equipment trolley 2 that is extended to move it nearby. The lance 3 is provided with a nozzle 13 on the side surface of its tip, and a lance rotation drive device 15 causes the lance 3 connected by gears to rotate about its long axis.

After confirming that the lance axis and the tapping hole axis match with each other using the confirmation means, the lance is moved forward and backward on the second rail 11 by the forward and backward drive device 16.
The lance rotation drive device 15 is configured to move back and forth and the lance tip can be inserted into and removed from the tapping hole 56.The lance rotation drive device 16 is connected to the second rail 11 with gears and is configured to move the lance rotation drive device 15 forward and backward. It is configured to move the drive device 15 back and forth.

The repair equipment cart 2 also has an adjusting means for adjusting the inclination angle of the lance to match the axis of the lance with the axis of the tapping hole.
A hydraulic cylinder 14 is mounted thereon.

In addition, it controls (unloads) the traveling of the repair equipment cart 2, inserts and removes the tip of the lance 3 into the tapping hole 5, rotates the lance 3, operates the hydraulic cylinder 14, and controls the lance forward and backward drive device 16. An operation panel l is provided to operate the supply/stop of the mixture, combustion-supporting gas, and combustible gas, and a television camera 8 is provided to image the exit of the tap hole 5 as a confirmation means to confirm that the lance axis and tap hole axis match. and a monitor television 9 for outputting photographed images.

Therefore, the alignment of the lance axis and the tapping hole axis is determined by the monitor TV 9.
This can be easily confirmed by adjusting the length of the hydraulic cylinder 14 while observing the image.

Supply devices for repair mixture, combustion-supporting gas, and combustible gas were omitted.

(Embodiment 2) This embodiment is an improvement on the structure of the repair equipment cart 2 of Embodiment 1, and will be explained in detail with reference to FIGS. 4 to 6.

4 to 6 are explanatory diagrams of other embodiments of the repair device of the present invention, in which FIG. 4 is a side view of the repair device cart 2a, and FIG. 5 is a view taken along the line A-A in FIG. 4. The locus of the tapping hole axis when the converter is tilted 19. FIG. 6 is a detailed view of the repair equipment cart 2a, with FIG. 6(a) showing a view taken along the line B--B in FIG. 4, and FIG. 6(b) showing a side view.

As shown in FIGS. 4 and 6, the third rail 18 is composed of two arc-shaped rails centered on the tilting axis 0 of the converter, and the wheels of the moving cart 12 are arranged on the third rail. 18 are connected by gears so as to be sandwiched from both sides, and the wheels of the movable trolley 12 are driven by the drive device 17 to move on the third rail 18.

A television camera 8 serving as a confirmation means for confirming that the lance axis and the tap hole axis match is fixed at the tip of the first rail,
If the mobile cart 12 is moved, it will move simultaneously with the lance 3.

The means for rotating the lance shaft, the means for moving the lance back and forth, the monitor television 9 for outputting photographed images, etc. are the same as those in the embodiment (2).

With such a configuration, the axis of the lance 3 can be made to coincide with the axis of the tap hole in the converter due to the tilting of the converter, and the repair equipment cart 2a is similar to the one provided in the repair equipment cart 2 of Embodiment 1. Eliminates the need for an inclination angle adjustment device for the three axes of the lance.

Therefore, by moving the movable cart 12 while taking an image of the tap hole 5 with the television camera 8 and observing its output on the monitor television 9, the axis of the lance 3 can be easily aligned with the tap hole axis.

In addition, Fig. 7 is an explanatory diagram of the situation in which the tap hole is repaired by thermal spraying in an empty furnace after steel is tapped in the converter, and Fig. 8 is an explanatory diagram of the situation in which the tap hole of the tap hole in the converter is repaired by thermal spraying during converter blowing. FIG.

(Effect of the invention 1) By applying thermal spraying repair to the repair of tapping refractories of metal smelting vessels, the effect of improving productivity and improving safety is large. In particular, the present invention apparatus The effect is even more remarkable because it can be applied remotely during blowing.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the converter repair method and repair apparatus of the present invention, showing a fixed TV camera and a monitor TV for remote control, in which the axis of the tapping hole and the axis of the thermal spraying lance match; FIG. 3 is an explanatory diagram for repairing the tapping hole by thermal spraying in an empty furnace after tapping the converter, and FIG. 3 is an explanatory diagram for repairing the tapping refractory of the converter by thermal spraying during converter blowing. 4 to 8 are explanatory diagrams of other embodiments of the repair device of the present invention, FIG. 4 is a side view of the repair device cart, and FIG. 5 is a view taken along arrow A-A in FIG. 4. Figure 6 shows the trajectory of the tapping hole axis when the converter is tilted, and Figure 6 is a detailed diagram of the repair equipment trolley.
Figure (a) is a BB arrow view in Figure 4, Figure 6 (b) is a side view, Figure 7 is an explanatory diagram of repairing the melting hole in the tap hole in the empty furnace after tapping the converter, Figure 8 is an explanatory diagram of the thermal spraying repair of the refractories produced in the converter during converter blowing, and Figure 9 is the relationship between the spraying distance and the porosity of the deposited layer when thermal spraying repairs are carried out in the converter tapping hole. It is a diagram. ■... Thermal spray repair equipment operation panel 2.2a... Thermal spray repair equipment trolley 3... Lance 4... Converter 5... Tapping hole 6... Molten metal 7... Lance for blowing 8・
...TV camera 9...-Monitor TV 10...
First rail 11...Second rail 12...-Moving trolley 13...-Nozzle 14--Hydraulic cylinder 1
5.--Lance rotation drive device 16..--Lance forward/backward drive device 17..--Lance bogie forward/backward drive device 18..-Third rail 19.--Trajectory 20..--Repair trolley drive device 0.. −Tilt axis

Claims (1)

[Claims] 1. A method for repairing a tap hole in a metal smelting vessel, in which a lance having a nozzle on the side surface of its tip and rotating around the long axis of the lance is inserted into the tap hole, and a refractory powder and an easily oxidizable powder are removed from the tap hole through the nozzle. 1. A method for repairing a tap hole in a metal refining vessel, comprising jetting a mixture of metal powders into a flame of combustible gas and combustion-supporting gas and spraying onto the wall of the tap hole. 2. The method for repairing a tapping hole according to claim 1, wherein the metal refining vessel is a converter. 3. The method for repairing a tap hole according to claim 1 or 2, wherein the tap hole has an inner diameter of 100 to 300 mm. 4. The method for repairing a tap hole according to any one of claims 1, 2 and 3, wherein the thermal spraying is carried out by aligning the axis of the tap hole with the axis of the lance. 5 A lance with a nozzle on the side surface of the tip, which rotates around the long axis of the lance and inserts and extracts the tip into the tap hole, and a lance on which the lance is placed and runs on a rail to move the lance tip into the tap hole. a repair equipment truck equipped with a means for adjusting the inclination angle of the lance axis for aligning the axis of the lance with the axis of the tapping hole; a confirmation means for checking the alignment of the axis of the lance and the axis of the tapping hole; and a running of the repair equipment truck. , a metal smelting vessel characterized by comprising means for adjusting the inclination angle of the lance, and an operation panel that controls the forward/backward movement and rotation of the lance and operates the supply/stop of the repair mixture, combustion-supporting gas, and combustible gas. Repair device for tap hole. 6 A lance with a nozzle on the side of the tip, which rotates around the long axis of the lance and inserts and extracts the tip into the tap hole, and a lance on which the lance is placed and runs on a rail to move the lance tip into the tap hole. A repair equipment trolley that moves on a rail laid concentrically with the tilting axis of the metal refining vessel and a movable trolley with a rail for the repair equipment trolley hanging vertically, and the alignment of the axis of the lance with the tapping hole axis. a confirmation means for checking, and an operation panel that controls the travel of the repair equipment cart, the movement of the mobile cart, the forward and backward movement and rotation of the lance, and also controls the supply and stop of the repair mixture, combustible gas, and combustible gas. A repair device for a tap hole in a metal smelting container, characterized by comprising: