JP2012162784A - Method of constructing block brick to steel tapping hole of converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of stacking all of block bricks without using particular facilities in a state where the furnace body of a convertor maintains its vertical posture.SOLUTION: After a lining block brick 4a is stacked at the circumference of a steel tapping hole in a state where the furnace is in a vertical posture, an iron dummy pipe 7 having a flange 7f at the end face on the inner side of the furnace is fitted into the block brick on the inner side of the furnace, the flange 7f is locked to the operation surface of the block brick 4a on the inner side of the furnace, and then a plurality of block bricks 4b and 4c for the outer side of the furnace are fitted one by one sequentially from the tip of the dummy pipe 7 that protrudes to the outside of the furnace at the steel tapping hole, and coaxially connected to the block brick 4a on the inner side of the furnace.

Description

  The present invention relates to a method for constructing block bricks at the converter steel outlet, and in particular, proposes a method for constructing block bricks in a non-tilting manner using a dummy pipe for forming steel holes.

  The converter is provided with a snout-shaped steel outlet for allowing the molten steel after refining to flow out into the ladle (steeling) at the top of the furnace body. Normally, block bricks (also referred to as “sleeve bricks”) that are easy to attach and detach are installed together with permanent bricks and lining bricks in the steel outlet. Because the brick at the steel outlet is the most worn part, the block brick and castable refractories and some lining bricks installed around it are frequently replaced, that is, repaired. Because it must be. In this respect, if block brick is used, the burden of repairing the brick at the outlet of the steel outlet is relatively small compared to the conventional general brick construction method.

  Conventionally, as a method of constructing block bricks (sleeve bricks) at the steel outlet of the converter, first, the furnace body of the converter is held in a vertical posture (hereinafter referred to as “furnace”). Below, the furnace-building operation | work which piles up the lining brick 3 around the steel outlet 1 including the throttle part 2, and the furnace inner side block brick 4a is performed. Thereafter, the converter is tilted by 90 °, and the posture is controlled so that the axial direction of the steel outlet snout 5 is oriented vertically as shown in FIG. Then, under this tilting posture, a plurality of block bricks (two in the illustrated example) 4b and 4c to be stacked on the outside of the furnace inside the steel outlet are placed in the steel outlet snout 5 using a crane or other lifting machine. Drop and stack sequentially. Thereafter, it is most common to cast castable refractory into the gap between the steel outlet snout 5 and the block brick 4 and to attach the flange lid 6 to form the steel outlet.

  For such a construction method, in the middle of the furnace construction work, if the attitude of the converter is tilted as described above, the existing bricks will be displaced or some problems will be solved that are likely to drop out. Technology has been proposed.

  For example, when it is limited to the improved technique using block brick, there is a method as disclosed in Patent Document 1 conventionally. In this disclosed technique, a block brick for a steel outlet hole, which is integrally formed in the longitudinal direction, is arranged from the outside of the furnace by arranging a table lifter and a roller table for a converter that remains in a “furnace”. It is a method of drawing into the mouth from the horizontal direction.

  Further, in Patent Document 2, when replacing and repairing a sleeve brick (block brick), a plurality of sleeve bricks are supported by a flanged pipe-shaped brick holding metal, and the flange part of the holding metal is outside the furnace. It discloses a method of performing the repairing operation easily and in a short time by welding and fixing to the furnace body flange portion and adjusting the mounting posture of the sleeve brick.

JP 2006-161093 A Japanese Patent Laid-Open No. 7-234078

  The method disclosed in Patent Document 1 is an effective method for solving the problems of the known technology as shown in FIG. 1, but a table lifter for moving an integrally formed large steel outlet block brick. However, there is a problem that the equipment cost becomes excessive.

  In addition, the method disclosed in Patent Document 2 proposes a method of mounting a presser with a flange on a sleeve brick, and proposes a method of stacking the sleeve brick itself on the steel outlet using the presser. However, the above-described problem remains as it does not disclose an effective stacking method for sleeve bricks as required in the present invention.

  Accordingly, an object of the present invention is to propose a simple method for stacking block bricks for steel outlets. In particular, the present invention is to propose a method in which all of the block bricks can be stacked without using any special equipment while maintaining the converter body in a vertical posture. .

  As a result of diligent research on a method for constructing a block brick at the steel outlet that can overcome the above-mentioned problems of the conventional technology, the inventors have arrived at the present invention according to the following summary configuration. That is, in the present invention, in the state where the furnace body is in a vertical posture, after stacking the inner brick around the steel outlet including the iron block inner brick for the steel outlet and the drawn work brick, A steel dummy pipe with a flange is fitted into the steel block hole of the furnace inner block brick, and the flange is locked to the working surface of the furnace inner block brick with a bolt, and then the furnace body is kept in a vertical posture. A converter characterized in that one or more of the outer block bricks are sequentially fitted from the tip of the dummy pipe projecting outside the furnace of the steel outlet and are connected coaxially with the inner block brick. Block brick to the steel outlet is the construction method.

  Further, in the present invention, after the installation of the outside block brick is finished, the excess tip portion of the dummy pipe is cut, and a pouring frame is temporarily attached to the tip of the steel outlet snout, and the gap around the block brick is attached. It is preferable to pour a castable refractory.

  Furthermore, in the present invention, it is more preferable to remove the pouring frame after casting and filling the cast double refractory and attach the holed flange lid to the flange portion at the tip of the steel outlet snout.

According to the present invention configured as described above, it is basically possible to perform the construction of block bricks on the steel outlet part easily and at low cost in a short time. Furthermore, in the case of the method of the present invention, the following effects can be expected.
A. This is effective when splitting multiple block bricks.
B. Since the furnace body of the converter is not tilted, it is possible to prevent the work bricks such as the constricted portion from falling off, shifting, and coming off.
C. Since block bricks are joined using an iron dummy pipe, misalignment of the steel holes can be prevented.
D. Block bricks to the steel outlet part of the converter where the steel outlet snout is inclined upward in the state of the furnace droop are particularly effective when applied to construction work.
E. Since non-tilting stacking work is performed, the furnace outside block brick to the steel outlet can be constructed in parallel with the furnace wall brick, so that the construction time of the furnace can be greatly reduced.

It is a fragmentary sectional view around a steel exit opening for explaining a conventional method of stacking steel exit block bricks. It is a fragmentary sectional view of the surroundings of a steel outlet which explains the method of stacking the steel outlet block brick according to the method of the present invention. It is a fragmentary sectional view which shows a form when pouring a castable refractory into the steel outlet part according to the method of the present invention. It is a basic diagram which shows an example of the form of the converter suitable for applying the method of this invention.

  Drawing 2 is a figure explaining an example of the construction method of the block brick (sleeve-shaped brick for outgoing steel holes) to the converter outgoing steel mouth part concerning the present invention. The most characteristic feature of the present invention is that not only the furnace wall bricks, that is, permanent bricks and work bricks, but also block bricks to be installed on the steel outlets. The so-called non-tilting stacking method is employed while maintaining the furnace body in a vertical posture. Hereinafter, this method will be described in detail.

  As shown in FIG. 2, in the present invention, first, among the furnace wall bricks of the converter, for example, the side wall work bricks 3a, the drawn work bricks 3b, and the sleeve-shaped parts to be dividedly constructed around the steel outlet 1 Of the block bricks 4, the furnace inner block bricks 4a are preloaded.

  Next, an iron dummy pipe 7 having a flange 7f as shown in FIG. 2 (b) is placed in the furnace outside direction from the inside of the furnace inside block brick 4a to the end surface which becomes the inside of the furnace when installed. Insert it toward. The dummy pipe 7 serves as a mounting guide for the block bricks 4a to 4c. Next, the flange 7f is locked to a working surface (furnace inner end surface) of the furnace inner block brick 4a after laying through an attaching means such as an eyebolt 8, and fixed in a predetermined direction. By the way, these works are carried out using existing cranes. The dummy pipe 7 used in this way is dissolved at the time of steel output and eventually disappears.

  Next, the outside block bricks 4b and 4c are sequentially attached to the dummy pipe from the outside of the steel outlet snout 5 using the crane and / or chain block 9 (not shown). That is, the outer block brick 4b is fitted to the dummy pipe 7 projecting out of the furnace, preferably from the steel outlet snout 5, and joined to the end face of the furnace inner block brick 4a. The furnace outer block brick 4c is joined by repeating the same operation to form a steel outlet hole.

  When the block bricks 4a to 4c are thus joined, the tip of the dummy pipe, that is, the portion projecting from the tip flange 5a of the steel outlet snout 5 is cut, and these end faces are substantially aligned. To be processed.

  Thereafter, a pouring frame 10 formed by forming a spout 10a made of a plywood plate or the like is temporarily fixed to the flange 5a portion of the steel outlet snout. Then, castable refractory is poured into the gap formed between the steel outlet snout 5 and the block bricks 4b and 4c.

  When the castable refractory 11 has been filled into the gap, the casting frame 10 is removed and, instead, a holed flange cover 12 is welded and fixed to the outer end face of the flange 5a of the outlet steel snout 5. The work is completed by closing the exit steel port except the steel hole.

The above-described construction method of the present invention has a great effect when applied to a converter as shown in FIG.
The reason for this is that in such a converter, because the steel outlet is inclined upwards, the split block bricks are likely to be displaced when they are aligned, and time is required to prevent them. This is because the method of the present invention does not require such extra work.

  According to the inventors actually carrying out the construction method according to the method of the present invention, the inner block brick was fixed to the working surface of the dummy pipe, the outer block brick was attached, the tip of the dummy pipe was cut, the pouring frame was Installation and casting of castable refractories, removal of the frame, and fixing of the flange lid, which took about 30 hours under the conventional method, were reduced to about 6 hours.

  The block brick construction method according to the present invention described above can be applied not only to the block brick stacking work at the converter steel outlet, but also to the brick building method having the same structure as other metallurgical furnaces. It is.

Claims (3)

  In the state where the furnace body is in the vertical position, after stacking the inner bricks around the steel outlet, including the block inner brick for the steel outlet and the work brick at the drawn part, first, an iron dummy with a flange on the inner end face of the furnace The pipe is fitted into the outlet hole of the furnace inner block brick, and its flange is locked to the working surface of the inner furnace block brick with a bolt. One to a plurality of block bricks outside the furnace are sequentially fitted from the tip of the dummy pipe protruding outward, and are connected coaxially with the block brick inside the furnace. Block brick construction method.   After the installation of the outer brick block, cut off the extra tip of the dummy pipe, and temporarily cast a casting frame on the tip of the steel outlet snout to pour the cascadable refractory into the gap around the block brick. 2. The method of constructing block bricks to the converter steel outlet according to claim 1.   3. The cast iron refractory according to claim 2, wherein after pouring and filling the cast double refractory, the pouring frame is removed, and a holed flange lid is attached to the flange portion at the tip of the steel outlet snout. Block brick construction method.

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