JPS62284008A - Method for repairing tap hole lining of converter - Google Patents

Abstract

PURPOSE:To quickly and surely repair the damaged tap hole of a converter by press-fitting and packing monolithic refractories into the space between the fresh sleeve brick which is inserted into the tap hole after the removal of the damaged sleeve brick and the block brick of the tap hole. CONSTITUTION:The converter is positioned perpendicularly to bring the tap hole 1 to a horizontal position. The damaged sleeve brick is disassembled and removed and thereafter, the new sleeve brick 8 is inserted into the tap hole and is fixed by a fixture 5 attached with a gas pipe 6. At the same time, a press-fitting nozzle 16 welded to said fixture 5 is inserted and fixed into the space formed between the sleeve brick 5 and the block brick 20 of the tap hole. The monolithic refractory material is then blown from the outside of the furnace and the out-of-furnace side of the space is packed and closed by the blown material 9. The converter is thereafter turned to the horizontal position to bring the tap hole 1 to the perpendicular position. The press-fitting material 9 of the monolithic refractories is then forcibly fed from the above- mentioned press-fitting nozzle 16 through a high-pressure rubber hose 17 by a squeeze pump 18 and is press-fitted and packed into the above-mentioned space.

Description

[Detailed description of the invention] 3 Detailed explanation of the invention Industrial applications The present invention relates to a method for repairing a converter tap port lining.

Conventional techniques When repairing the converter tap port lining, the following techniques have been used: (]) replacing the sleeve brick; (2) inserting a nozzle into the inner surface of the tap port block brick to fully remove the refractories. (3) Replace all sleeve bricks and fill the gap between them and the tapping block bricks from the outside of the furnace.For spraying, fill the area with fireworks from the outside of the furnace, then turn the converter over and place it inside the furnace. A method of filling and repairing using refractory material (acrylic material) VC that melts due to heat % Formula % Problems to be solved by the invention The problems of the above-mentioned known method are as follows: 1ll
In the O method, damaged sleeve light tiles are heated (SOθ~t
oo°C) using a breaker or a dismantling machine.

When using a placket, the converter is turned over, the tap hole is facing downward, a simple scaffold is installed inside the entire furnace, and the scaffold is used to dismantle.

After cleaning the inner surface of the tap hole, applying mortar all over the outer periphery of the new sleeve brick, and setting it into the tap hole several times, a wide gap may be created on the outer periphery of the new sleeve brick. In this case, the stamp material is filled, but it is a hot work no matter what.
The working environment is bad and dangerous, and a reliable repair effect cannot be expected, and the working time is about 3 to 1 hours, which reduces the branch furnace operation rate and reduces productivity.

In method (2), on the inner surface of the damaged tapping block brick,
This is a repair method in which a nozzle attached to a repair machine is inserted and monolithic refractories are sprayed or press-fitted onto the inner circumferential surface of the block brick at the outlet of the tap.It can be repaired in about 10 minutes, but As soon as the monolithic refractories in the upper half of the steel opening begin to sag, the shape of the tap hole becomes difficult to form a circular cross section, and as a result, slag or base metal easily adheres to the hole, causing hole clogging. In addition, the lifespan is short and repairs are required frequently, resulting in a low furnace operating rate.

As shown in the cross section in Figure 5, method (3) involves completely dismantling and removing the damaged sleeve bricks, installing new sleeve bricks, and
Insert a nozzle into the gap between the tap hole block brick and fill with cine-shaped refractories by spraying from the outside of the furnace.After fixing, turn the converter completely over and direct the tap hole directly downward. After that, a monolithic refractory (baking material) that melts hot (zoo-too degrees Celsius) is poured into the furnace and fills the gap, which makes it impossible to fill it to the depths sufficiently densely. . Therefore, there is a defect that hot water easily leaks from this part.

Means for Solving the Problems The present invention has been made in order to eliminate the above-mentioned defects, and its object is to provide a method that can reliably repair a damaged converter tap in a short period of time. That is, in the present invention, the damaged 9-sleeve brick is completely dismantled and removed, a new sleeve brick is installed, and a nozzle is inserted into the gap between the tapped O-block brick and the
The present invention provides a complete method for repairing a tap pipe by filling and fixing the monolithic refractories, closing the gaps, and then press-fitting the refractories. Specifically, a nozzle is inserted into the gap between the new replacement sleeve brick and the tapped O-block brick, and the area around this is filled with monolithic refractory by spraying and fixed, closing the gap. Then, after sealing and connecting the nozzle, press-in machine or spray machine, and high-pressure rubber hose and pipe, turn the converter on its side, and place the monolithic refractories fully into the gap directly below the tapping port. This is to firmly form mO by filling. What is important at this time is to appropriately adjust the curing time of the monolithic refractory.

The repair method of the present invention will be further explained in detail based on an example shown in FIG.

Set the converter vertically, tap the tap in a nearly horizontal position,
The damaged sleeve bricks were dismantled and dismantled.
Clean the inner surface of the tap hole block brick and replace it with a new sleeve brick/
Insert If. A press-fitting nozzle lt is inserted into the gap between the new sleeve brick t and the tapped block brick 20, which is generated at this time, and the entire monolithic refractory is sprayed from outside the furnace to fill the gap and perform temporary fixing. Thereafter, this press-in nozzle /J and a squeezo pump 1lr (not shown) are connected with a high-pressure rubber hose 17, and the converter is completely turned over so that the tapping port /f is vertical. Next, the rear pressure personnel 19 who had a big liquid sound to Mortar Ixer
Add f and knead for about 1 minute, transfer the kneaded material to a hot pot, operate squee 2 and pump TTR, and continue to force feed and press fit. When the press-in material 19 overflows from the inside of the furnace, the squeezo pump is stopped and the press-in is completed.

After io minutes have passed after the press-fitting is completed, turn the converter completely upside down and make it vertical, remove it from the high-pressure rubber hose /7 from the press-fit nozzle /4,
The major work is completed. The press-fit nozzle lt is left as is, and steelmaking operation begins.

FIG. 2 is a bottom view showing the fixed state of the press-fit nozzle/4 in the above example, and here is a rib whose both ends are welded to the sleeve brick fixing fitting j and the gas pipe t, respectively.

FIG. 3 is a cross-sectional view of a main part showing another example of how the monolithic refractory press-fit nozzle is installed. In this example, the press-fit nozzle /A is fixed to the sleeve brick fixing fitting j by an appropriate means such as welding, and the sleeve brick fixing fitting to which the press-fit nozzle /4 is fixed! is fixed to the 7-lunge μ via the packing l by an appropriate means, and then the press-fitting material 19 is press-fitted (filled).

According to this method, there is no gap between the sleeve brick t and the 7 langes μ, so there is no need to perform spraying to fix the press-fit nozzle /J as in the nine cases described above.

Is Fig. μ the fixing mode of press-fit nozzle/7? This is a bottom view showing the sleeve brick fixing fittings and the gas pipe tVC at both ends. A press-fit nozzle/4 is fixed by welding to the ribs 1 to 2 that have been welded. With this taphole lining structure, it has a lifespan of approximately 2 to 300 charges, and compared to other repair techniques, the structure is strong and has a long life, and the converter operation rate is high.
Repair work costs are low and it is also economical.

Effects of the invention (1) - The time required to repair the tap hole during the furnace period was shortened, and the furnace operation period was completely improved [Conventional technology VC
[Repair time reduced by 30%] (2) With conventional technology (2), each time the repair is done, the repair material (lined refractory material) in the upper half of the tap hole is vertical and the hole shape is circular. First, during tapping, the molten metal does not converge, and the hole shape expands due to abrasion in the present invention, but the molten metal converges and is tapped.

(3) In conventional technology (3), the temperature is not constant in the depth direction of the lining (it decreases as it goes to the outside of the furnace), so the meltability of the repair material is poor on the outside of the furnace, and the filling density is low. Every time steel is tapped, excessive force is applied to the sleeve brick, causing it to break? This can lead to short-lived sleeve bricks. On the other hand, in the present invention, since the packing density is stable, the life of the sleeve brick is also stable, and scheduled repairs are possible.

(4) As mentioned in the previous section, the present invention reduces the repair time per one time, -reduces the frequency of repairs during a furnace life (replacement frequency of sleeve bricks), and reduces the total repair time during a furnace life by VC. It has become possible to reduce repair costs through reduction.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of the repair method of the present invention, and Figure 2 is the installation mode shown in Figure 1. FIG. 3 is a partial bottom view showing another example, FIG. 3 is a bottom view showing another installation mode, and FIG. During:
L... Converter tapping port, K... Side wall brick, 3... Iron shell, μ... 7 lange, j... Sleeve brick fixing fittings,
t...Gas pipe, 7...Pin or cock, r...Sleeve brick, ? ... Spraying material, 10... Baking material, ll
... Lining refractory (unshaped), /, 2... Agricultural refractory (brick), 13... Boom, ll... Stopper, /! ...welding, ll...press-fit nozzle, 17...
・High pressure rubber hose, Ig...squeeze bump, 19
...Wang personnel, 20...Steel tapping block 1.2/...
・Nozotsukin, +22. +, rib.

Claims (1)

[Claims] The damaged sleeve brick of the tap hole of the converter is removed, a new sleeve brick is inserted into the tap hole, and a monolithic refractory is inserted into the gap between the sleeve brick and the tap hole block brick from the outside of the tap hole. A converter tapping port, characterized in that a material press-in nozzle is inserted and fixed, the outside part of the gap is closed, and the unfilled part of the gap is press-fitted with monolithic refractories from the press-fit nozzle to be filled. Lining repair method.