JP5691225B2 - Blast furnace wall construction method - Google Patents

Description

  The present invention relates to a method of constructing a blast furnace wall, and in particular, intends to prevent leakage of an irregular refractory when filling a gap around a stave cooler with an irregular refractory.

Conventionally, when constructing the furnace wall of a blast furnace, a construction method has been adopted in which the joints formed between the stave cooler and the stave cooler and the space between the stave cooler and the iron shell are filled with an irregular refractory. I came. For example, as described in Patent Document 1, for example, a seal plate is attached, a gap between stave coolers is sealed, and then an amorphous refractory is filled.
Further, as described in Patent Document 2, as a sealing technique for the gap between the stave coolers, there is a technique that uses a cloth sealing tape instead of the sealing plate.

  FIG. 1 shows a technique described in the above-mentioned Patent Document 2, in which a cloth seal tape is used as a seal against the gap between the stave coolers described above. In this technique, the cloth seal tape 3 is bonded so as to pass over a space between the stave cooler 1 (1 ′) and the stave cooler 2 (2 ′), that is, between the stave coolers 1 and 2. Next, an indeterminate refractory is press-fitted around the cloth seal tape 3 to close the joint S1. Furthermore, it is a technique of constructing a furnace wall by pouring and filling an irregular refractory into a space S2 formed between the stave coolers 1 and 2 and the iron skin 4.

  However, in recent years, as a stave cooler for a blast furnace wall, from the viewpoint of extending the life of the blast furnace, as shown in Patent Documents 3 and 4, the surface of the blast furnace has been provided with irregularities. It has become to.

JP 7-278626 A JP 2008-121079 A JP 2004-324986 A JP 2008-31520 A

  The stave cooler used in Patent Documents 3 and 4 listed above has a plurality of grooves as uneven portions on the furnace inner surface side of the blast furnace, and bricks are fitted into the grooves. In general, in the case of such a brick insertion method, in order to insert a brick, it is made large so that there is a margin in the dimensions of the groove width and the groove depth of the stave cooler compared to the dimensions of the brick. That is, a certain amount of gap is generated between the groove and the fitted brick. As a result, it has been difficult to make the stave cooler furnace inner surface side substantially flat due to the gap between the stave cooler furnace inner surface and the fitting brick furnace inner surface.

  Therefore, in order to fill the amorphous refractory and construct the furnace wall, even if the technique of Patent Documents 1 and 2 is applied to the periphery of the stave cooler shown in Patent Documents 3 and 4, the interior of the stave cooler furnace Since there are irregularities on the inner surface side of the brick furnace fitted, it becomes difficult to seal so as not to leak the irregular refractory with the fixing means by the sealing plate, and in the case of sealing members such as cloth sealing tape, There was a problem of securing the sealing property that it did not adhere sufficiently. Moreover, even if it tried to smooth the stave cooler furnace inner surface and the fitting brick furnace inner surface side, there existed a problem that the construction period became long.

  The present invention has been developed in view of the above-described present situation, and can facilitate the furnace wall construction work around the stave cooler in a short period of time, and the gas in the furnace penetrates between the back of the stave cooler and the iron skin. An object of the present invention is to provide a method for constructing a blast furnace wall that does not cause trouble such as generation of a so-called back wind.

That is, the gist configuration of the present invention is as follows.
1. A stave cooler having a concavo-convex shape is installed inside the blast furnace iron skin, and when filling the joint between the stave coolers and the space between the stave cooler and the iron skin with an irregular refractory, After applying an irregular refractory to the inner surface of the furnace and smoothing the inner surface of the furnace , a seal tape is applied to the gap between the stave coolers, and then the irregular refractory is applied to the joint and the space. A method of constructing a blast furnace wall characterized by filling.

2. 2. The method for constructing a blast furnace wall according to 1 above, wherein the thickness of the amorphous refractory applied to the inner surface of the furnace is 15 mm or more.

  By the method according to the present invention, the furnace wall construction work around the stave cooler can be performed easily and efficiently, so that the construction period of the furnace wall construction work can be shortened. Moreover, by using the furnace wall constructed according to the present invention, it is possible to provide a safe and long-life blast furnace that is excellent in durability against gas intrusion in the furnace.

It is a fragmentary perspective view which shows the conventional stave cooler installation structure. It is the figure which showed the stave cooler according to this invention. It is the figure which showed the example which constructed | assembled the cloth tape to the stave cooler according to this invention.

Hereinafter, the present invention will be specifically described.
First, we examined the sealing technology for joints and spaces, which are problematic when building the blast furnace wall as described above. However, the leak-proof technology for irregular refractories by adhering the seal tape itself is a very excellent technology because it can be applied easily and in a short time.

Therefore, the inventors have studied means for solving the problem of the uneven shape of the stave cooler.
In a stave cooler in which a plurality of grooves are formed on the furnace inner surface side, bricks are generally fitted into the grooves. In this case, as described above, it is necessary to provide a sufficient clearance between the groove and the brick in order to fit the brick that is not elastically deformed. As a result, a gap is not generated between the groove and the fitted brick, and the furnace inner surface side of the stave cooler and the furnace inner surface side of the fitted brick are not substantially flat.

Furthermore, if the seal tape is forcibly bonded to the furnace surface of the stave cooler and the fitted brick where the irregularities are generated, a poorly bonded portion is generated, resulting in a seal failure with respect to the flow of the irregular refractory. .
When such a seal failure occurs even at one location, leakage of the irregular refractory occurs, the peeling of the seal expands from the leakage of the irregular refractory, and the irregular refractory flows out. It will cause a large leakage of irregular refractories.

Therefore, the inventors tried various studies on the technology for smoothing the sticking surface of the seal.
As a result, a stave cooler is installed inside the blast furnace iron skin, and when filling the joint between the stave cooler and the space between the stave cooler and the iron shell with an indeterminate refractory, the inside surface of the stave cooler is smoothed. In order to achieve this, an ingenuity refractory was applied, a seal tape was applied to the gap between the stave coolers, and then the joint and space were filled with the indeterminate refractory.

2 and 3 illustrate a furnace body cooling stave cooler according to the present invention. In the figure, 11 is a stave cooler, 12 is a fitting brick, 13 is a smooth and irregular refractory material applied to smooth the sticking surface, 14 is an anchor, 15 is a sealing tape, and 16 is an adjacent stave cooler. .
In the present invention, as shown in FIG. 2, in order to smooth the sticking surface of the stave cooler 11, the maximum surface of the brick 12 on the furnace inner surface side of the stave cooler 11 is covered with an irregular refractory and smoothed. It is characterized by having a step of applying the amorphous refractory 13. Reference numeral 14 denotes an anchor that supports the smooth irregular refractory 13.
As the coating method, any of the conventionally known coating methods such as coating construction, spraying construction, wet spraying construction, etc., in which an amorphous refractory is applied to a wall having irregularities can be used.
In particular, it is advantageous to use an application method in that a good smooth surface is formed.

Here, the type of the amorphous refractory 13 used in the present invention is not particularly limited, but a castable refractory can be preferably used. A castable refractory is a powder in which a fireproof aggregate and a fireproof cement or a special binder are blended, and water is added to the castable refractory.
An alumina-based refractory can be used as the castable refractory. Moreover, although the powder which floated on the construction surface may arise after castable refractory enforcement, the adhesiveness of a sealing tape is securable by removing powder.

The thickness of the irregular refractory 13 according to the present invention is desirably 15 mm or more. This is because even if a height difference occurs between the furnace inner surfaces of adjacent stave coolers, it can be dealt with by scraping a part of the irregular refractory 13. On the other hand, if the thickness is less than 15 mm, the strength of the irregular refractory 13 is not sufficient, and the amorphous refractory 13 may be peeled off from the stave cooler 11 when a sealing tape is applied. Therefore, the thickness of the irregular refractory 13 is set to 15 mm or more. The upper limit of the thickness of the irregular refractory 13 is not particularly limited. However, even if it is excessively thick, work efficiency, economy, and the like are deteriorated.
In addition, when using an anchor for prevention of peeling of the amorphous refractory 13, the thickness can be further increased, but it is preferable to make it higher than the anchor height by 50 mm or less. Preferably it is 30 mm or less, More preferably, it is 20 mm or less.

  Then, between the blast furnace iron shell (not shown) and the furnace wall refractory brick (not shown) made of carbon brick or the like arranged at a predetermined interval from the iron shell as described above. A stave cooler 11 for cooling the furnace body is installed.

As shown in FIG. 3, the seal tape 15 is bonded so as to close a gap between the stave cooler 11 having the irregular refractory 13 and the adjacent stave cooler 16 having the irregular refractory 13. In addition, since the space | interval of a gap | interval will interfere with filling when it is too narrow, it is about 10 mm-50 mm, Preferably it is about 20 mm-40 mm.
The sealing tape 15 used in the present invention may be a conventionally known cloth sealing tape. For example, natural fibers, organic fibers, and woven fabrics using inorganic fibers, which are excellent in water absorption and are flexible, knitted fabrics, nonwoven fabrics, and the like are preferable. .

Further, the adhesive force between the sealing tape 15 and the adhesive surface smoothed by the irregular refractory is not a problem as long as it can withstand the filling of the irregular refractory that closes the joints and the like, but the adhesive shear strength is 100 (N / cm ² ) or higher, preferably 490 (N / cm ² ) or higher, using an adhesive exhibiting an adhesive shear strength.

  As the adhesive, flexible epoxy resins such as epoxy resin adhesives using polyamidoamine as a curing agent, modified aliphatic polyamines and modified polyamide resins, and modified epoxy resins using polyamidoamine as a curing agent are used. Is large and suitable.

Next, the above-mentioned space is formed by pouring an indeterminate refractory for pouring into the joint between the furnace inner side sealed with the sealing tape 15 and the space between the stave coolers 11 and 16 and the iron skin. Is filled with a desired amount of amorphous refractory. In addition, it is the same also using the sealing tape between the stave coolers in the vertical direction of the stave coolers 11 and 16.
By further stacking refractory bricks for the furnace wall inside the furnaces of the stave coolers 11 and 16 according to a conventional method as required, a desired blast furnace furnace wall can be constructed.

  According to the present invention, not only a blast furnace, but also a metallurgical furnace that seals gaps and joints using a sealing tape and is filled with an indeterminate refractory for pouring can be used. Contributes to extending the service life.

DESCRIPTION OF SYMBOLS 1, 2 Stave cooler 3 Cloth seal tape 4 Iron skin 11 Stave cooler 12 Inserted brick 13 Unshaped refractory material applied in order to make a sticking surface smooth 14 Anchor 15 Seal tape 16 Adjacent stave cooler S1 Joint S2 Iron skin And the space between stave cooler

Claims (2)

A stave cooler having a concavo-convex shape is installed inside the blast furnace iron skin, and when filling the joint between the stave coolers and the space between the stave cooler and the iron skin with an irregular refractory, After applying an irregular refractory to the inner surface of the furnace and smoothing the inner surface of the furnace , a seal tape is applied to the gap between the stave coolers, and then the irregular refractory is applied to the joint and the space. A method of constructing a blast furnace wall characterized by filling. The method for constructing a blast furnace wall according to claim 1, wherein the thickness of the amorphous refractory applied to the inner surface of the furnace is 15 mm or more.

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