JP3796981B2 - Stave - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stave made of copper or copper alloy.
[0002]
[Prior art]
A stave cooling system is known as a cooling system for a furnace body in a blast furnace. Conventional stave is generally made of cast iron, but under the condition of repeated heat fluctuations in the furnace, it is made of cast iron, so the surface layer inside the furnace becomes high temperature due to insufficient cooling capacity and material deterioration and wear. There is a problem that the life of the furnace is shortened by the progress of the heat treatment, or the warpage caused by the thermal stress, which disturbs the profile inside the furnace, or the stave itself cracks and breaks.
[0003]
Therefore, recently, a stave using copper or a copper alloy superior in physical properties such as thermal conductivity and ductility has been developed. By using copper or a copper alloy, the stave body has a uniform temperature distribution at a lower temperature, the generated thermal stress can be suppressed, and the amount of deformation is also reduced. For this reason, damage to the stave body is reduced, and the life of the furnace can be extended.
However, if the stave material is changed from cast iron to copper, the cooling effect on the contents by the stave increases because copper is excellent in thermal conductivity. For this reason, depending on the installation location of the stave, the amount of heat removal becomes excessive, and there may be a problem that the furnace filling is cooled more than necessary, resulting in an increase in the fuel ratio.
[0004]
In order to solve this problem, for example, there is an invention of a cooling plate for a vertical furnace disclosed in Japanese Patent Publication No. 63-56283.
8 is a rear view of the stave disclosed in the publication, and FIG. 9 is a cross-sectional view taken along line AA in FIG. In the present specification, the back surface of the stave means a surface that becomes the outside of the furnace (iron skin) when the stave is installed in the furnace body, and the front surface means a surface that becomes the inside of the furnace.
[0005]
The structure of a conventional stave will be described with reference to FIGS. Reference numeral 50 denotes a rectangular plate-shaped stave made of copper or a copper alloy, and a cooling water channel 53 is formed therein. Reference numeral 55 denotes an inlet / outlet pipe connected to the cooling water passage 53 and connected to a cooling water supply side (not shown). A mounting bolt (not shown) for fixing the stave body to the iron skin is provided on the back of the stave.
Reference numeral 57 denotes a plurality of horizontal grooves formed on the front surface of the stave, and a fireproof material (not shown) is attached to the plurality of grooves 57. Accordingly, copper and refractory material are alternately arranged on the front surface of the stave.
[0006]
In the conventional stave as described above, the amount of heat extraction can be reduced by reducing the area of copper on the front side of the stave.
[0007]
[Problems to be solved by the invention]
However, in the conventional stave as described above, a part of copper is exposed to the inside of the furnace, and further, since the refractory material is installed in an exposed state inside the furnace, The refractory material on the front of the stave is reduced due to contact wear and cracks, the exposed area of copper increases over time, and the heat removal increases gradually. Therefore, even though the amount of heat removal can be suppressed to a certain extent at the beginning, there is a problem that the amount of heat removal becomes large due to the volume reduction of the refractory material due to aging.
[0008]
In addition, in order to suppress the aging change as described above, it is necessary to select a refractory material to be installed on the front surface of the stave, which has a thermal shock and is difficult to break. Therefore, the thermal conductivity is simply low. The fact is that you can't choose one. For this reason, the heat transfer rate from the cooling layer (layer with water channel) to the front surface of the stave is increased not only due to aging but also in the initial stage, and the amount of heat removal becomes excessive.
[0009]
For this reason, it is possible to extend the life of the furnace by adopting a copper stave, but depending on the part used, it may be due to an increase in the amount of heat extracted due to changes in the usage condition due to material and aging. The problem of an increased fuel ratio remained.
Further, since the refractory material is exposed, there is a problem in workability that it is necessary to consider that external force does not act on the refractory material during installation.
[0010]
The present invention has been made to solve such a problem, and an object of the present invention is to obtain a stave made of copper or a copper alloy and capable of stably reducing the amount of heat removal.
[0011]
[Means for Solving the Problems]
The stave according to the present invention is a stave made of copper or a copper alloy, wherein a metal lining material having a lower thermal conductivity than copper or a copper alloy is attached to the entire front surface of the stave body, and the metal lining The material has a plate-like shape having a tapered ridge on the back, and a groove is formed on the entire front surface of the stave body, and the metal lining material is mounted by inserting the ridge into the groove. It is characterized by that.
Further, the metal lining material has a plate shape having a tapered ridge on the back surface, and a groove is formed on the entire front surface of the stave body, and the metal lining material has the ridge formed on the groove. It is mounted by being inserted into the.
Furthermore, a gap is provided in a contact portion between the stave body and the metal lining material.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a side view of Embodiment 1 of the present invention, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a rear view. Hereinafter, the configuration of the first embodiment will be described with reference to FIGS.
A rectangular plate-shaped stave body 1 is made of copper or a copper alloy (hereinafter referred to as “copper or the like”). On the front side of the main body 1, a tapered concave groove 1 a is formed as an engaging portion with a lining material 15 described later.
Reference numeral 3 denotes a cooling water passage formed on the back side inside the main body 1, and reference numerals 5 to 11 denote entrance / exit pipes through which cooling water is connected to the cooling water passage 3.
A mounting bolt (not shown) for fixing the main body 1 to the iron skin is provided on the back of the stave.
[0013]
Reference numeral 15 is a heat-resistant cast steel lining material attached to the front surface of the main body 1. The lining material 15 has a flat plate shape with a flat front surface and a tapered ridge 15a on the back surface. The lining material 15 is attached to the main body 1 by inserting the ridges 15 a into the concave grooves 1 a of the main body 1 from the side of the main body 1. After the mounting, in order to prevent the lining material 15 from falling off, it is stopped by a stopper or the like (not shown).
In addition, in the state which mounted | wore the main body 1 with the several lining 15, the front surface is comprised so that it may become flush | level, and the profile inside a furnace is made smooth.
[0014]
The operation of the present embodiment configured as described above will be described.
Since the front surface of the main body 1 made of copper or the like is covered with a lining material 15 having a low thermal conductivity, the amount of heat passing from the inside of the furnace to the main body 1 side is small compared to a use state in which copper is exposed. Therefore, the amount of heat removal can be suppressed.
On the other hand, the lining material 15 and the main body 1 are in contact with each other on an uneven surface, and the contact area between the lining material 15 and the main body 1 is increased to enhance the cooling effect on the lining material 15. For this reason, it can prevent that the lining material 15 fuse | melts by the heat load from the furnace inner side.
[0015]
That is, the lining material 15 is located between the main body 1 and the inside of the furnace and suppresses the amount of heat removal as a heat insulating member, and the heat input to the lining material 15 is smoothly removed to the main body 1 side and the lining material 15 itself melts. It is configured so that nothing happens.
[0016]
In the present embodiment, since the main body 1 is made of copper or the like, the main body 1 can be prevented from being deformed or cracked due to thermal conductivity or ductility of copper or the like. Moreover, by attaching the lining material 15 to the front surface of the main body 1, the amount of heat removal can be moderately suppressed, and deterioration of the fuel ratio due to excessive heat removal amount can be prevented.
Furthermore, the structure that ensures a large contact area between the lining material 15 and the main body 1 can enhance the cooling effect on the lining material 15 and prevent melting.
[0017]
Further, the lining material 15 is made of heat-resistant cast iron and can remain for a long time without causing a volume loss at an early stage unlike the refractory material shown in the conventional example. For this reason, the copper surface is not exposed to the furnace due to secular change, and the amount of heat removal can be continuously suppressed.
Further, since the lining material 15 is made of metal and is not easily broken by the action of an external force like a brick or the like, handling during installation becomes very easy.
[0018]
Embodiment 2. FIG.
FIG. 5 is a side view of the second embodiment of the present invention, and the same parts as those in FIGS. 1 to 4 showing the first embodiment are denoted by the same reference numerals. In the figure, reference numeral 20 denotes a lining material, and the basic configuration is the same as that of the first embodiment, except that the material of the lining material is higher in thermal conductivity than that of the first embodiment. In addition, the contact surfaces of adjacent ones of the lining materials 20 are inclined surfaces, and a gap is provided at the contact portion between the lining material 20 and the main body 1.
[0019]
The reason why the inclined surface is provided on each lining material 20 is as follows. As shown in FIG. 6, the lining material 20 may be deformed in a direction in which the inner surface of the furnace is recessed as shown in FIG. 6. In this case, the lining material 20 is arranged up and down by providing an inclined surface. The lining materials 20 are restrained from each other, and deformation of each lining material 20 is suppressed. That is, as shown in FIG. 5, by making the inclined surface downward from the front side to the back side, one of the lining materials 20 placed on the lower side restrains deformation of the one placed on the upper side. Become.
[0020]
In addition, the gap is provided in the contact portion between the lining material 20 and the main body 1 for the following reason. That is, as described in the first embodiment, the contact surface between the main body 1 and the lining material is increased because the amount of heat passing from the lining material to the main body 1 is increased to prevent the lining material from melting. there were. However, when the thermal conductivity of the lining material is relatively high, the amount of heat passing from the lining material to the main body 1 becomes too large, and the effect of suppressing the heat removal amount that is the original purpose cannot be obtained.
Therefore, by providing a gap in the contact portion between the lining material 20 and the main body 1, the amount of heat passing from the lining material to the main body 1 is limited, and the heat removal amount of the stave, which is the original purpose, is suppressed. is there.
In other words, the engagement between the lining material 20 and the main body 1 is enabled by the tapered irregularities, and the amount of heat passing from the lining material to the main body 1 can be limited.
[0021]
In the present embodiment, since the contact surfaces of adjacent ones in each lining material 20 are inclined surfaces, the adjacent lining materials 20 are restrained from each other, and deformation of each lining material 20 can be suppressed.
Further, since a gap is provided in the contact portion between the lining material 20 and the main body 1, the amount of heat removal can be suppressed even when a material having a relatively high thermal conductivity is used as the lining material.
[0022]
The inclination direction of the inclined surface may be an upward inclined surface from the front side toward the back side. In this case, among the lining materials 20, the one arranged on the upper side restrains the deformation of the one arranged on the lower side.
[0023]
Moreover, in order to ensure mounting | wearing with the lining material 20 and the main body 1, you may make it fix the lining material 20 and the main body 1 with the volt | bolt 23, as shown in FIG.
[0024]
In the above embodiment, the lining material is made of heat-resistant cast iron as an example, but the present invention is not limited to this and may be made of metal having a lower thermal conductivity than copper or the like. For example, it may be made of steel, cast steel, or cast iron.
[0025]
Moreover, although the example arrange | positioned in the horizontal direction was shown as an arrangement direction of a lining material, this invention is not restricted to this, You may arrange | position in the vertical direction.
[0026]
Further, as examples of the fixing method of the lining material, the lining material and the main body 1 are provided with projections and recesses so as to be fitted with each other, or are fixed with bolts. The material may be cast.
Moreover, you may combine these methods.
[0027]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0028]
A copper or copper alloy stave with a metal member with lower thermal conductivity than copper on the entire front surface inside the furnace. Due to its superior physical properties such as copper, deformation of the main body and generation of cracks Can be prevented, the amount of heat removal can be moderately suppressed, and deterioration of the fuel ratio due to excessive heat removal can be prevented.
In addition, since the members provided on the entire front surface of the furnace are made of metal, there is no early loss of volume in contact with the furnace filling as in the refractory material shown in the conventional example, and stable volume maintenance is possible. It becomes possible. For this reason, the amount of heat removal can be stably suppressed without changing the amount of heat removal due to aging as in the conventional example. Further, since it is not easily broken by the action of an external force like a brick or the like, handling during installation becomes very easy.
[Brief description of the drawings]
FIG. 1 is a side view of a first embodiment of the present invention.
FIG. 2 is a plan view of the first embodiment of the present invention.
FIG. 3 is a front view of the first embodiment of the present invention.
FIG. 4 is a rear view of the first embodiment of the present invention.
FIG. 5 is a side view of Embodiment 2 of the present invention.
FIG. 6 is an explanatory diagram of the operation of the second embodiment of the present invention.
FIG. 7 is an explanatory diagram of another aspect of the second embodiment of the present invention.
FIG. 8 is a rear view of a conventional example.
9 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
1 Body 3 Cooling water channel 2
15 Lining material

Claims (3)

A stave made of copper or a copper alloy, wherein a metal lining material having a lower thermal conductivity than copper or a copper alloy is attached to the entire front surface of the stave body, and the metal lining material is tapered on the back surface. A plate-like shape having ridges, a groove is formed on the entire front surface of the stave body, and the metal lining material is mounted by inserting the ridge into the groove. Stave.   The stave according to claim 1, wherein the metal lining material is made of steel, cast steel, cast iron, or heat-resistant cast steel. A stave made of copper or copper alloy, comprising a metal lining material having a lower thermal conductivity than copper or copper alloy on the entire front surface of the stave body, and the stave body and the metal lining material Stave characterized by providing a gap in the contact part.

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