JP5569948B2 - Blast furnace wall construction method - Google Patents

Description

  The present invention relates to a method for constructing a blast furnace furnace wall, and in particular, when a furnace wall is constructed by installing a stave cooler in an iron shell, an infinite shaped refractory material is filled in a gap around the stave cooler. We propose an effective way to make it part of

  Conventionally, as a method of constructing a furnace wall by filling a joint formed between the stave coolers and a gap formed between the stave cooler and the iron shell with an amorphous refractory material, Patent Documents 1 and 2 are used. However, prior to the filling of the irregular refractory material, first, (a) a method of attaching a sealing plate between the stave coolers, (b) a method of attaching a wire mesh, (c) metal A method of attaching a fixed hardware (seal plate) is known.

For example, FIG. 1 and FIG. 2 show a method of treating joints between stave coolers using the above-mentioned metal fixed hardware (c). This method is the joint S ₁ between the staves cooler 2 cross, to pass sieved between adjacent staves cooler 1, clasp 3 ... the welded fixed, made strip-shaped metal through a mounting bolt 4 A seal plate 5 is disposed, and then an irregular refractory material (stamping material) is press-fitted around the metal plate 5 in the joint S ₁ to close the joint S ₁ . This is a technique for constructing a furnace wall by pouring and filling an irregular refractory material (a pouring material) into a gap S ₂ formed between the iron shell 6 and the iron shell 6.
JP-A-2-267205 JP 7-278626 A

  When constructing a furnace wall according to the prior art, that is, when installing or renovating a blast furnace, a stave cooler is installed between the iron skin and the furnace wall refractory brick, or an irregular shaped refractory material is sprayed or poured into the furnace wall. The technology for constructing has the following problems.

In the prior art, there is an operation to install a strip-shaped metal seal plate 5 between the stave coolers to fill in an irregular refractory material. Especially in a large blast furnace, a stair cooler can be installed for 3 days. It was necessary. In addition, it took one day to press-fill the irregular refractory material around the seal plate disposed between the stave coolers, and it also took two days to cure the refractory material. Moreover, when an irregular refractory material is poured between the iron skin 6 and the stave coolers 1 and 2, the casting material often leaks. That is, the problem is described in more detail as follows.
a. Construction of a metal seal plate is a complicated work involving welding, etc., and also occurs between the iron skin and the stave cooler after the construction and curing of an irregular refractory material for sealing the joint to the seal plate. A construction period of 5 to 6 days is required until the irregular refractory material is poured into the gap.
b. Due to poor casting of the irregular refractory material to the joints, the casting material filled in the gap between the iron skin and the stave cooler often leaks, and the progress of the process, such as reworking the casting work and removing the leaked casting material, It is often an obstacle.
c. Since the strength of the packed bed of irregular refractory material to the joints between the stave coolers is low, this packed bed is damaged by the raw material in the furnace early in the operation, and this becomes a path for hot air gas in the furnace, and the stave cooler wears out. To shorten the life of the stave cooler.
d. The metal seal plate placed on the joint between the stave coolers is constructed by the can manufacturer, but the subsequent work is in charge of the construction of the furnace, which reduces the continuity of the construction and extends the construction period. Invite.
e. The joint between the stave coolers has an error of about ± 20 mm depending on the construction accuracy, and when the joint is wide, it becomes wider than the width of the seal plate, so an irregular refractory material was poured into the gap between the iron skin and the stave cooler. Sometimes it cannot withstand that pressure, causing leakage of the casting material, but when the joint width is narrow, the metal seal plate does not fit in the joint, and it is necessary to cut it on site. Will increase.

  Therefore, an object of the present invention is to make the furnace wall construction work around the stave cooler in a short period of time easily and to have a desirable furnace wall structure, and it is strong in itself and has problems such as gas leakage in the furnace. It is to establish the construction technology of the blast furnace wall that does not invite.

  While examining the above-mentioned problems of the prior art, the inventors have come up with the idea of using a cloth seal tape instead of a method for temporarily closing the joint between the stave coolers using a wire mesh or a metal seal plate. It was. When cloth is used in place of the conventional metal seal plate, the work is as much as there is no preliminary work of accommodating and holding the clasp 3, bolt 4, and metal seal plate 5 in the joint. In addition to simplification, it is possible to quickly remove excess moisture from the irregular refractory material, and thus to firmly seal the joint between the stave coolers.

The present invention has been developed based on such knowledge. A stave cooler is installed inside the blast furnace iron skin, and a refractory brick is applied to the inside to construct the furnace wall. In this case, prior to filling the joint formed between the stave coolers and the gap formed between the stave cooler and the iron shell with the amorphous refractory material, it was attached to the surface of the adjacent stave cooler inside the furnace . Fill the joint with only the water-absorbent flexible soft cloth sealing tape, and then fill the joint between the stave coolers and the gap between the stave cooler and the iron shell with an indeterminate refractory material, a method of constructing a as the seal tape, natural fibers, fabrics made of organic fibers or inorganic fibers, knitted, a cloth seal tape using a nonwoven fabric used, and scan the cloth seal tape The furnace inner joint gap between Bukura to Fu塞, the furnace inner surface of the stave cooler, the adhesive shear strength indicates 100 (N / cm ²⁾ or more characteristics, the polyamide amine curing agent epoxy resin adhesives or modified aliphatic polyamines and modified polyamide resin, and bonded via a modified epoxy resin adhesive to the curing agent of any of polyamidoamine of blast furnace wall, characterized in that close the joint gap The construction method is the gist configuration.

As the adhesive used in the present invention, it is preferable to use an epoxy resin adhesive having a polyamide amine as a curing agent, a modified aliphatic polyamine or a modified polyamide resin, or a modified epoxy resin having a polyamide amine as a curing agent .

Further, when the cloth seal tape is stuck on the surface of the stave cooler inside the furnace (refractory brick side), the adhesive having a large adhesive force with the steel-cloth, that is, the adhesive shear strength is 100 (N / cm ^2). ) Or more, preferably using an adhesive exhibiting characteristics of 490 (N / cm ² ) or more.

When adopting the method of the present invention according to the configuration described above,
a. Since complicated installation work using a metal seal plate and spraying construction of joint refractories can be omitted, rapid construction is possible, and a drastic reduction in construction time can be expected.
b. Since all the construction work can be performed only by the furnace construction worker, it is easy to adjust the arrangement of the workers, and the construction period can be shortened and the construction cost can be reduced.
c. Since the fabric sealing tape, which is a flexible material, is used, the construction surface level of the casting amorphous refractory material for casting can be controlled because the fabric sealing tape swells and deforms during the construction of casting irregular refractory material. Construction becomes easy. In addition, after construction, it is possible to peel off the sealing tape, and directly check whether or not the irregular refractory material for pouring is filled in the joints, construction management is easy, and construction walls The quality of the is greatly improved.
d. By using so-called water-absorbent flexible soft cloth sealing tape that has good water permeability and softness, the sealing tape absorbs and volatilizes the moisture of the unshaped refractory material for pouring that comes into contact with the sealing tape. The furnace inner surface side of the joint between the stave coolers, which has been a weak point in the past, can form a dense joint with a finer and lower moisture content. That is, the strength of the joint refractory that becomes the starting point of wear of the stave cooler can be increased, and the life of the stave cooler is greatly improved.
e. Without being affected by the joint accuracy between the stave coolers, it is possible to reliably seal against the irregular refractory material for pouring in a short time.
Such effects can be obtained.

FIG. 3 illustrates one embodiment of the present invention, and includes an iron shell 21 and a furnace wall refractory brick (not shown) made of carbon brick and the like arranged at a predetermined interval from the iron shell. In the meantime, the furnace body cooling coolers 22 and 23 are shown. As is apparent from this figure, the present invention is to seal the joint S ₁ portion formed between the staves cooler 22 and 23 mutually adjacent in the vertical and horizontal, is characterized in that it utilizes a fabric seal tape 24 .

That is, in the construction method according to the present invention, first, as shown in FIG. 4, in order to seal the inner portion of the joint S ₁ between the stave coolers 22 and 23 disposed inside the iron skin 21, The cloth seal tape 25 is bonded to the inner surface of the stave coolers 22 and 23 through an adhesive 24. In addition, the space | interval of a normal joint is about 20 mm-50 mm, and sufficient intensity | strength is obtained with the said fabric sealing tape in order to block | close this space | gap.

In the method of the present invention, next, for pouring into both spaces of the gap S ₂ between the stave coolers 22, 23 and the iron skin 21, including the joint S ₁ whose inside of the furnace is closed with the cloth seal plate. A non-standard refractory material is poured at once, or filled by spraying.
In addition, the furnace wall of the blast furnace completed by stacking the furnace wall refractory bricks can be constructed on the inside of the furnace of the stave coolers 22 and 23 thereafter.

  In the present invention, it is preferable to use a woven fabric, a knitted fabric, a non-woven fabric or the like using natural fibers, organic fibers, or inorganic fibers, which are soft soft materials, as the fabric sealing tape having a characteristic configuration. More preferably, it is preferable to use a woven fabric, a knitted fabric, a non-woven fabric or the like using an organic fiber or an inorganic fiber which is a soft soft material having good water absorption. That is, a sheet-like cloth having high water permeability is used. For example, a thick woven fabric such as canvas or denim is preferred.

As described above, when the cloth seal tape 25 having good water absorption, that is, good water permeation characteristics is used, moisture in the amorphous refractory material 26 that is a casting material moves from the portion adjacent to the cloth seal tape 25 to the inside of the furnace. since going to dehydration, part of the amorphous refractory material in the joint S ₁ is becomes dense packing refractories, increased refractory strength, thus contributing to the improvement of the refractory life.

  In addition, at this time, as shown in FIG. 4 (c), the cloth sealing tape 25 is deformed when filled with a high moisture content amorphous refractory material due to the flexibility (flexibility) of the material. Although it expands to the inside of the furnace, it shrinks by dehydration of the amorphous refractory material, so that the expansion and contraction can be balanced to form the intended joint surface.

In order to secure such construction, in the present invention, it is necessary to firmly bond the cloth seal tape 25 to the stave coolers 22 and 23. As the adhesive 24 that can meet this requirement, an adhesive having a large adhesive force (steel-cloth), preferably adhesive shear strength, when the cloth sealing tape is attached to the inside of the furnace (the refractory brick side) of the stave cooler. Is an adhesive having a characteristic of about 100 (N / cm ² ) or more, preferably 490 (N / cm ² ) or more. For example, a flexible epoxy resin such as an epoxy resin adhesive using a polyamide amine as a curing agent, a modified aliphatic polyamine or a modified polyamide resin, or a modified epoxy resin using a polyamide amine as a curing agent is preferably used.

  When the furnace wall around the stave cooler is constructed by the method according to the present invention shown in FIG. 3 and FIG. 4 described above, the construction work period for filling the amorphous refractory material per stage of the stave cooler in the large blast furnace is Although it took one week, the construction was completed in three days. Moreover, although the life of a stave cooler is generally 20 to 25 years, it is presumed that a life longer than that can be expected when the construction is performed according to the method of the present invention.

  The present invention relates to a method for constructing a furnace wall of a blast furnace, which is a furnace for other metallurgical furnaces that seals joints using the water-absorbent flexible cloth sealing tape and is filled with an irregular refractory material for pouring. It can also be used as a wall refractory construction technology.

It is a fragmentary perspective view which shows the conventional stave cooler installation structure. It is a basic diagram explaining the process of the furnace wall construction method around the conventional stave cooler. It is a fragmentary perspective view which shows the stave cooler installation structure of this invention. It is a basic diagram explaining the process of the furnace wall construction method around the stave cooler of this invention.

Explanation of symbols

S ₁ Joint S ₂ Gap 21 between iron skin and stave cooler Iron skin 22, 23 Stave cooler 24 Adhesive 25 Fabric seal tape 26 Amorphous refractory material (casting material)

Claims (1)

A stave cooler is installed inside the iron shell of the blast furnace, and when a furnace wall is constructed by constructing a refractory brick inside the blast furnace, the joint between the stave coolers and between the stave cooler and the iron skin Prior to filling the gap formed in the non-standard refractory material, the joint is closed only with a water-absorbent flexible soft cloth sealing tape adhered to the inner surface of the adjacent stave cooler, and then the stave is closed. In a method for constructing a furnace wall of a blast furnace by filling an inter-cooler joint and a gap between the stave cooler and an iron shell with an amorphous refractory material,
As the sealing tape, a fabric sealing tape using a woven fabric, a knitted fabric or a nonwoven fabric made of natural fibers, organic fibers or inorganic fibers,
And shows the cloth seal tape to Fu塞the furnace inner joint gap between staves cooler, the furnace inner surface of the stave cooler, the adhesive shear strength is 100 (N / cm ²⁾ or more characteristics , the epoxy resin adhesive to a polyamide amine curing agent or, modified aliphatic polyamines and modified polyamide resin, and bonded via a modified epoxy resin adhesive to the curing agent of any of polyamidoamine close the joint gap A method for constructing a blast furnace wall characterized by the following.

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