JP2001049314A - Stave cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stave cooler, in which the fall-down of a refractory held in notched parts of a metal-made body is restrained and even in the case of falling down, the charged material, such as ore, is filled into the whole notched parts after falling down and thus, the heat load is reduced. SOLUTION: In the stave cooler set in a furnace body in a metallurgical furnace used for refining the ore, etc., and melting metal, concave-state notched parts for holding the refractory, are arranged at the front surface of the metal- made body 1 in the stave cooler are arranged, and the angle of elevation of the upper surface of the notched part to the horizontal plane, is made in the range of 20-30 deg. when the stave cooler is set in the furnace body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stave cooler installed in a furnace of a metallurgical furnace used for refining ores and melting metals.

[0002]

2. Description of the Related Art Various systems and methods have been proposed and put into practical use as a method of cooling a furnace body of a metallurgical furnace used for refining ore and melting metals. Among them, stave coolers are widely used because they provide good cooling and have excellent durability.

[0003] The temperature inside the metallurgical furnace is high, and inevitably the inside surface of the stave cooler becomes high temperature. At this time, thermal stress occurs due to the temperature difference inside the stave cooler,
Deformation and cracking may occur, and melting may occur if the temperature is excessively high. In order to prevent deformation, cracks and erosion, the inside of the metal body of the stave cooler
A cooling flow path through which a cooling medium flows is arranged to perform necessary cooling.

However, in general, a metal body alone cannot withstand a severe heat load. Therefore, a refractory is installed inside the furnace of the metal body to insulate the metal body and keep the metal body at a low temperature. Measures have been taken. As a method of installing a refractory, a method of providing a concave cutout on the inner surface of a furnace of a metal body and accommodating the refractory has been widely used.

FIG. 5 is a schematic cross-sectional view of a conventional stave cooler. A cooling flow furnace 12 is provided inside the metal body 11, and a concave cutout portion is provided on a surface inside the furnace of the metal body 11, and a refractory 13 is accommodated therein. The cross-sectional shape of the notch, that is, the cross-sectional shape of the refractory is rectangular.

FIG. 6 is a schematic cross-sectional view of another conventional stave cooler. A cooling channel 12 is provided inside the metal body 11, and a concave cutout portion is provided on the inside surface of the furnace of the metal body 11, and a refractory 14 is accommodated therein. The cross-sectional shape of the notch, that is, the cross-sectional shape of the refractory is wedge-shaped, and the inside of the furnace is small. The stave cooler having such a structure is, for example, a registered 1327.
No. 088 (JP-A-56-15781),
No. 1,307,41.

As shown in FIG. 6, if the cross section of the notch has a small wedge shape inside the furnace, the refractory stored in the notch is prevented from falling off as it is.
However, refractories are often cracked, peeled and fall off, and when used for a long time, regardless of the cross-sectional shape,
Most of the refractory housed in the notch disappears.

[0008] Japanese Patent Application Laid-Open No. H4-130741 discloses that
The notch has a small wedge shape inside the furnace,
Furthermore, it has been proposed to provide the notch with an anchor for supporting the refractory. According to this, the refractory housed in the notch can be stabilized for a longer period.
However, peeling and falling off of the refractory cannot be completely prevented, and it is inevitable that the refractory disposed in the cutout portion will eventually disappear.

By the way, a charge such as ore is buried in the notch after the refractory has disappeared. If the charge is buried in the entire cut-out, the thermal insulation is less effective than the refractory, but much more effective than without the charge. If the charge is buried in a part of the notch and there is a gap, the heat insulation effect of the charge is inferior, the inside surface of the stove cooler becomes hot, the heat load increases, and damage is caused. There was a problem that accelerated.

[0010] Further, the cooling passage arranged inside the metal body of the stave cooler must be at least a certain distance from the outer periphery of the stave cooler in order to maintain the strength of the stave cooler. Therefore, the cooling of the outer peripheral portion of the stave cooler is weaker than the central portion, and in many cases, the outer peripheral portion has a higher temperature than the central portion.

At this time, in order to lower the temperature of the outer peripheral portion,
If the cooling is increased, there is a problem that the cooling in the central portion becomes too strong. If the cooling of the stave cooler is excessively strong, the amount of heat removal increases, the consumption of fuel such as coke increases, and the production cost increases. Further, the temperature in the vicinity of the furnace body decreases in the metallurgical furnace, which hinders smelting of ore or the like and melting of the metal itself.

[0012]

As described above, in the conventional stave cooler, although measures have been taken to prevent the refractory housed in the notch portion of the metal main body from falling off, after the fallout, No measures were taken. In addition, inside the metal body of the stave cooler, a cooling flow path through which a cooling medium flows is arranged so that necessary cooling is performed, but the outer peripheral portion of the stave cooler has a higher temperature than the central portion. There was a problem.

According to the present invention, the refractory housed in the notch of the metal body is prevented from falling off,
It is an object of the present invention to provide a stave cooler in which a charge such as ore is buried in the entire cutout portion after falling off and a heat load is reduced. Another object of the present invention is to perform uniform and appropriate cooling over the entirety of the stave cooler.

[0014]

Means for Solving the Problems The present inventor has made intensive studies to solve the above-mentioned conventional problems. as a result,
If the upper and lower surfaces of the notch for storing the refractory part on the front of the metal body of the stave cooler are at a required angle with respect to the horizontal plane, the refractory is prevented from falling off, and even if it falls off, It was found that the charge was buried in the entire cutout after dropping, and the heat load was reduced.

Further, in a stove cooler in which four or more cooling passages are arranged, the interval between the cooling passages located on the outer peripheral side is made narrower than the interval between the cooling passages located on the central side, so that the outer periphery is cooled. Part cooling is enhanced, and
It has been found that the cooling of the central portion is not impaired, and uniform and appropriate cooling can be performed over the entire stove cooler.

Further, a cooling passage is arranged at a position close to the front surface (inside the furnace) of the stave cooler, another cooling passage is arranged at the rear surface, and a cooling passage at the front portion and a cooling passage at the rear portion are provided. By arranging them so as to be substantially orthogonal to each other, it has been found that uniform and appropriate cooling can be performed over the entire stove cooler.

The present invention has been made based on the above findings, and a first aspect of the stave cooler of the present invention is provided in a furnace of a metallurgical furnace used for refining ore or melting metal. A concave notch for accommodating a refractory on a front surface of a metal main body of the stave cooler, and an elevation angle of a top surface of the notch with respect to a horizontal plane corresponds to the stave cooler. When installed in the furnace body, the angle is in a range of 20 degrees to 30 degrees.

According to a second aspect of the stave cooler of the present invention, the elevation angle of the lower surface of the cutout portion with respect to the horizontal plane is 10 degrees when the stave cooler is installed in the furnace body.
Between 30 degrees and 30 degrees.

In a third aspect of the stave cooler according to the present invention, the cooling passages include four or more cooling passages, and a space between the cooling passages located on the outer peripheral side of the stave cooler is located at a central portion. It is characterized in that it is narrower than the space between the cooling channels.

In a fourth aspect of the stave cooler of the present invention, the cooling flow path comprises a cooling flow path arranged near a front surface of the stave cooler and a cooling flow path arranged near a rear surface of the stave cooler, In addition, the cooling passage arranged near the front surface and the cooling passage arranged near the rear surface are arranged so as to be substantially orthogonal to each other.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stave cooler according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing one embodiment of the stave cooler of the present invention, and shows a schematic cross section. FIG. 2 is an enlarged view of a cutout portion in which a refractory is stored. As shown in FIG.
A cooling flow path is provided in the inside, and a cutout portion is provided on the inner surface of the furnace of the metal main body 1 to accommodate the refractory 3.

The elevation angle θ1 of the “upper surface” of the notch portion with respect to the horizontal plane is determined when the stave cooler is installed in the furnace body.
20 degrees or more and 30 degrees or less.

The furnace body in which the stove cooler is installed is not always vertical, but may be inclined. Since the stave cooler is generally installed along the furnace body, FIG.
As shown in FIG. 1 (C), the stave cooler may also be installed at an angle. At this time, in any case, the elevation angle of the “upper surface” of the notch with respect to the horizontal plane is 20 degrees when the stove cooler is installed in the furnace body.
It is important that the temperature is not less than 30 degrees and not more than 30 degrees.

The repose angle of the charge such as ore and coke as fuel is generally 30 to 40 degrees. These charges are buried in the notch after the refractory falls off. At this time, if the elevation angle of the “upper surface” of the notch with respect to the horizontal plane is small, as shown in FIG. In addition, a gap is formed in the notch. Conversely, if the elevation angle of the “upper surface” of the cutout with respect to the horizontal plane is larger than the angle of repose of the charge, the charge is buried in the entire cutout.

When the elevation angle is increased in order to prevent the generation of the gap, the angle of the upper end of the refractory initially accommodated in the cutout portion becomes an acute angle. As a result, the strength of the corner becomes weak, cracks are generated in a short time, and peeling and falling off occur. To suppress this problem, the angle of the corner of the refractory should be as close to 90 degrees as possible.

In view of this contradictory requirement, if the elevation angle of the "upper surface" of the notch portion with respect to the horizontal plane is set to 20 degrees or more, as shown in FIG. Is substantially buried. Although a small gap is formed at the back of the notch, the size is not a problem. When the angle is 30 degrees or less, the strength of the corners of the refractory can be sufficiently maintained.

The reason why the load is substantially buried in the entire cutout portion even when the elevation angle of the “upper surface” of the cutout portion with respect to the horizontal plane is smaller than the angle of repose is considered as follows.
That is, the charge charged in the front of the stave cooler is constantly descending, and a force acts on the front of the stave cooler. As a result, the charge moves toward the depth of the notch, and even at an angle smaller than the angle of repose,
Fill up to the notch.

Next, the elevation angle of the "lower surface" of the notch with respect to the horizontal plane will be described. The elevation angle θ2 of the “lower surface” of the notch with respect to the horizontal plane is set to 10 degrees or more and 30 degrees or less when the stave cooler is installed in the furnace body. When the “lower surface” of the cutout is horizontal, the load embedded in the cutout is constantly replaced as it descends and is not stable.
If the elevation angle of the “lower surface” of the notch with respect to the horizontal plane is set to 10 degrees or more, the charge is stably embedded in the notch. At this time, the angle of the lower end of the cutout portion of the metal body becomes an acute angle, and if it is extremely small, the strength is reduced.
In order to avoid a decrease in strength, it is sufficient that the elevation angle of the “lower surface” of the cutout portion with respect to the horizontal plane is 30 degrees or less.

As described above, by defining the elevation angles of the upper surface and the lower surface of the notch with respect to the horizontal plane, the charge is buried in the entire notch after the refractory falls off. Thereby, heat insulation by the charge is achieved, and the heat load is reduced.

The elevation angle of the "lower surface" of the notch with respect to the horizontal plane is set to 10 degrees or more and 30 degrees or less when the stove cooler is installed in the furnace body, so that the refractory housed in the notch remains unchanged. Will not fall off.

Next, in the stave cooler of the present invention, the above-mentioned cooling passages are composed of four or more cooling passages. Smaller than the interval. 3A and 3B are diagrams showing an example of the arrangement of the cooling passages in the stave cooler of the present invention. FIG. 3A shows the arrangement of the cooling passages when viewed from the side, and FIG. FIG. 3 schematically shows the arrangement of cooling channels when viewed. The stave cooler of this example has four cooling channels built-in. The intervals of the cooling flow paths are a1 and a2 on the outer peripheral side, b on the central side, and a
1 <b, a2> b.

At this time, cooling of the outer periphery of the stave cooler is enhanced, and cooling of the central portion is appropriately maintained. As a result, appropriate cooling was performed throughout the stave cooler.

Next, the stave cooler of the present invention has a cooling flow path comprising a cooling flow path arranged near the front surface of the stave cooler and a cooling flow path arranged near the rear surface of the stave cooler. The cooling passage arranged at a position close to the cooling passage arranged at a position close to the rear surface is arranged to be substantially orthogonal. FIG. 4 is a diagram showing an example of an arrangement of cooling channels in the stave cooler of the present invention.
FIG. 4A shows the arrangement of cooling channels when viewed from the side, and FIG.
(B) schematically shows the arrangement of the cooling channels when viewed from the rear. A cooling flow channel 2 is arranged substantially vertically in a position near the front surface of the stave cooler, and another cooling flow channel 5 is arranged in a position near the rear surface. The cooling flow path 5 is meandering and substantially orthogonal to the cooling flow path 2 except for the vicinity of the outer periphery.

As a result, the cooling of the stave cooler was made uniform over the whole, the thermal stress caused by the temperature difference inside the stave cooler was suppressed, and the generation of deformation and cracks could be prevented. In addition, the stave cooler shown in FIG. 4 was installed in the furnace body of a high temperature part in the metallurgical furnace, and functioned effectively as described above.

[0035]

As described above, according to the present invention, a stave cooler that functions stably for a long time can be provided.
High industrial utility value.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of one embodiment of the stave cooler of the present invention.

FIG. 2 is an enlarged view of a cutout portion in which a refractory is accommodated.

FIG. 3 is a diagram showing one embodiment of a stave cooler of the present invention.

FIG. 4 is a diagram showing one embodiment of a stave cooler of the present invention.

FIG. 5 is a schematic cross-sectional view of a conventional stave cooler.

FIG. 6 is a diagram showing a schematic cross section of a conventional stave cooler.

[Explanation of symbols]

 1. Metal body 2. Cooling channel 3. Refractory 4. Charge in furnace 5. Another cooling channel 11. Metal body 12. Cooling channel 13. Refractory

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F27D 1/12 F27D 1/12 A (72) Inventor Atsushi Sakai 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (72) Inventor Tsuneo Araki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo F-term inside Nippon Kokan Co., Ltd. 4K002 BB03 4K012 CA09 CA10 DC10 DE08 4K015 CA04 4K045 MA03 RA06 4K051 HA01

Claims (4)

[Claims] 1. A stave cooler installed in a furnace of a metallurgical furnace used for refining ore or melting metal.
When a concave notch for accommodating a refractory is provided on the front surface of the metal body of the stave cooler, an elevation angle of a top surface of the notch with respect to a horizontal plane is when the stave cooler is installed in the furnace body. A stove cooler characterized by being in the range of 20 to 30 degrees. 2. The method according to claim 1, wherein an elevation angle of a lower surface of the notch with respect to a horizontal plane is in a range of 10 degrees to 30 degrees when the stave cooler is installed in the furnace body. Stove cooler. 3. The cooling passages are formed of four or more cooling passages, and the interval between the cooling passages located on the outer peripheral side of the stave cooler is smaller than the interval between the cooling passages located at the center. A stove cooler characterized by: 4. The cooling flow path includes a cooling flow path arranged near a front surface of the stave cooler and a cooling flow path arranged near a rear surface of the stave cooler, and is arranged at a position close to the front surface. A stove cooler characterized in that a cooling flow path and a cooling flow path arranged at a position near a rear surface are arranged substantially orthogonally.