KR101585810B1 - Apparatus for cooling furnace - Google Patents

Abstract

The present invention relates to a device to cool a furnace. According to the present invention, the device to cool a furnace comprises: a stave body placed inside a furnace, having a side placed to face or touch a steel shell of the furnace; a cooling line placed in the stave body, circulating cooling water inside; a combination part protruding from the stave body or dented on the same; and a refractory part including a plurality of members, fixated to an other side of the stave body by the combination part, to cover and protect the stave body. The members of the refractory part touch each other in an outer direction of the stave body, but the members facing each other are able to be made of different materials.

Description

[0001] Apparatus for cooling furnace [0002]

The present invention relates to a cooling apparatus for a furnace for cooling a furnace, particularly a furnace of a furnace exposed to a high temperature environment.

As shown in FIG. 1, a conventional blast furnace 1 includes a coke oven as a fuel and iron ore as a raw material falling from an upper portion thereof, and blowing a hot air through a tuyere (not shown) Is a facility to produce.

The blast furnace (1) is a facility very vulnerable to thermal damage due to continuous exposure to a high temperature environment, because not only pulverized coal but also hot air and gas are continuously supplied through the tuyere of the blast furnace (1).

In order to cool the blast furnace 1 as described above, a stave 6 for cooling is installed inside the steel pipe 2 of the blast furnace 1, as shown in Fig.

The stove (6) is a cooling system for protecting the iron foil (2) from a high temperature environment. A cooling water pipe (5) penetrating the blast furnace (2) is provided in the stove (6). Further, the stave 6 is provided with a recessed portion on its front surface, and the refractory 3 is sandwiched between the recessed and protruded portions.

The charge 4 charged in the inside of the blast furnace 1 repeats direct contact with the entire surface of the stave 6 including the refractory 3 inside the blast furnace so that damage to the stave 6 Becomes inevitable.

That is, due to repeated contact between the refractory 3 and the charge 4 on the dove-tail structure of the stave 6 and the stress concentration due to the load of the charge 4, the refractory 3 on the front surface of the stave 6 ) Is damaged in the early stage and is dropped out repeatedly.

Therefore, the cooling system of the blast furnace 1 is severely damaged, and the cooling function of the refractory 3 is remarkably deteriorated due to the breakage of the refractory 3, thereby causing thermal damage to the blast furnace 1 itself.

In this case, the damaged blast furnace is entirely replaced, or a partial replacement operation is performed. In this case, the cost of replacement of the blast furnace is large, and the blast furnace is inevitable during the replacement operation.

Korean Registered Utility Model No. 20-0153860 (registered on May 13, 1999)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems and aims at facilitating the maintenance of the furnace, extending the service life of the furnace, reducing the related costs, and contributing to improvement in productivity.

Specifically, the object of the present invention is to improve the cooling efficiency of a furnace using a stove, in particular, a furnace iron, thereby preventing thermal damage to the furnace.

Another object of the present invention is to provide a durable cooling system that is not easily damaged by a load or a collision caused by a load.

The present invention provides a furnace cooling apparatus as described below.

A cooling apparatus for a furnace according to the present invention comprises a stove body disposed on an inner side of a furnace and having one side thereof being in contact with or facing one side of a furnace of the furnace; A cooling line; an engaging portion protruding or recessed from the stave body; And a refractory portion provided with a plurality of members fixed to the other surface of the stave body by the engaging portion and provided to cover and protect the stave body, wherein the refractory portion includes a plurality of members, And the neighboring members are provided in contact with each other in the outer circumferential direction of the eve body, but they may be made of different materials.

Preferably, the material of the refractory portion is made of a first material and a second material, wherein the first material has a greater wear resistance and thermal expansion coefficient than the second material, and the second material has a coefficient of thermal expansion One of the members may be made of the first material, and the neighboring member contacting the member may be made of the second material.

More preferably, the engaging portion includes a coupling protrusion provided on a surface of the stove body facing the inner side of the furnace and protruding at a predetermined height; And an engaging groove portion formed to be concave at a predetermined height, wherein edges of the engaging protrusion and the engaging groove portion can be rounded. Thereby distributing the stress concentrated at the edges.

More preferably, the refractory portion includes a coupling portion corresponding to the shape of the coupling protrusion portion and the coupling groove portion, and the coupling portion is coupled to the stave body by being inserted into the coupling groove portion. The first refractory material including the first material, absence; And a second refractory member including a second material, wherein the first refractory member and the second refractory member are disposed to be offset from each other to cover the stave body.

More preferably, the coupling protrusion and the coupling recess may be continuously provided in the circumferential direction or the height direction of the furnace in the stave body.

More preferably, the first material is provided as a carbon-based material, and the second material is provided as a carbon-based material.

More preferably, the engaging projections and the engaging recesses are provided in the stator body in the circumferential direction or the height direction of the furnace, and the first refractory member and the second refractory member are arranged in the circumferential direction and / And the upper surface of the stave body may be arranged to be offset from each other in at least one direction of the height direction.

According to the present invention, continuous cooling of the furnace is possible, and stability and productivity of the furnace can be improved.

Specifically, a cooling apparatus having sufficient durability against repetitive loads or impacts caused by a load can be constructed.

In addition, partial maintenance is easy, and maintenance cost is reduced, so that manufacturing cost can be reduced.

Fig. 1 shows a conventional blast furnace.
2 is an enlarged view of the area A in Fig.
3 schematically shows a stave body of a furnace cooling apparatus according to a preferred embodiment of the present invention.
4 is a perspective view of a cooling apparatus for a furnace according to a preferred embodiment of the present invention.
5 is a perspective view of a cooling apparatus for a furnace according to another embodiment of the present invention.

In order to facilitate an understanding of the description of the embodiments of the present invention, elements denoted by the same reference numerals in the accompanying drawings are the same element, and among the constituent elements that perform the same function in each embodiment, Respectively.

Further, in order to clarify the gist of the present invention, a description of elements and techniques well known in the prior art will be omitted, and the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood, however, that the spirit and scope of the present invention are not limited to the embodiments shown, but may be suggested by those skilled in the art in other forms, additions, or alternatives, .

On the other hand, the furnace described below means an ordinary means for heating and accommodating a heating object such as an electric furnace or a heating furnace used in an industrial field. However, in the following, the furnace will be referred to as a blast furnace for the sake of brevity and clarity.

3, the furnace cooling apparatus according to the preferred embodiment of the present invention comprises a furnace body 10, in particular a furnace body 10 disposed on the inner side of the furnace and having one side in contact with or facing the furnace bottom 10 A cooling line 20 provided in the stave body for circulating cooling water therein; a coupling part 30 protruding or recessed from the stave body; And a refractory part which is fixed to the other surface of the stator body and is provided to protect the stave body by mutually different materials.

As shown in FIG. 5, the refractory portion is provided so as to cover the entire surface of the stave body 10 facing the inside of the blast furnace 1, thereby protecting the stave body 10 from high-temperature heat. Thus, the stave body 10 faces the inside of the blast furnace 2 to cool the blast furnace 2 without damage for a long time.

In addition, the refractory portion is primarily in contact with the charge falling into the blast furnace, thereby preventing the stave body 10 from coming into direct contact with the charge. Accordingly, it serves to protect the internal cooling line 20 by delaying the damage of the stave body 10. The cooling line 20 is provided in the form of a pipe so that the cooling water can circulate therein, but it is needless to say that appropriate cooling means other than water can be selected and applied by those skilled in the art.

The inner wall of the blast furnace 1 is damaged by embrittlement caused by corrosion and thermal stress caused by molten iron. The stave body 10 is protected by the refractory portion, and the cooling line 20 are protected, efficient cooling of the blast furnace 1 can be maintained for a long time. Therefore, by cooling the cooling line 20 by circulating the cooling water, the thermal damage of the blast furnace 1 can be prevented in advance.

However, the refractory portion tends to be broken due to the fall of the repeated charge or fall off from the stave body 10 due to stress concentration.

Accordingly, in the present invention, the joint portion of the refractory portion and the stave body 10 is rounded to disperse the stress.

3, the engaging portion 30 provided on the surface of the stave body 10 facing the inner side of the blast furnace 1 has a coupling protrusion 31 protruding at a predetermined height, And an engaging groove portion 32 formed therein.

At this time, the coupling protrusion and the coupling groove may be formed in other shapes than those shown in FIG. 3, but the invention is not limited thereto.

What is important is the shape of the edge of the engaging projection 31 and the engaging recess 32. That is, the coupling protrusion edge 31a and the coupling groove edge 32a may be rounded to have a constant r value.

The r-value is not limited to the present invention, but may be suitably selected and applied depending on the user and the use environment. However, if the corner has a round shape having a proper r value, the effect of dispersing the stress applied to the coupling groove and the coupling protrusion can be obtained.

Therefore, even if the refractory portion coupled to the engaging groove portion and the engaging protrusion portion is damaged to some extent and partially removed from the stave body 10, the edges of the engaging groove portion and the engaging protrusion exposed to the charging object are rounded, Thereby minimizing and dispersing the impact caused by the collision charge.

Therefore, even if some areas of the engagement groove 32 and the engagement protrusion 31 continuously provided in the stave body 10 are exposed to the charge, the stress applied to the exposed portion is dispersed, It is possible to prevent the breakage of the entire joint groove 32 and thus to prevent the joint between the joint protrusion 31 and the joint groove 32 from falling off have.

5, the refractory portion includes a coupling portion 41 corresponding to the shape of the coupling protrusion 31 and the coupling groove 32. As shown in FIG. In particular, the fastening portion 41 may be provided in the form of a protrusion having a predetermined height to fit into the engaging groove portion 32, but the present invention is not limited thereto.

Therefore, according to the preferred embodiment of the present invention, the coupling portion 41 is inserted into the coupling groove portion 32, so that the coupling between the refractory portion and the stave body 10 can be realized.

In particular, the refractory portion may be provided in a polyhedral shape and may include a first refractory member 42 including a first material and a second refractory member 43 including a second material. The first and second refractory members 42 and 43 are disposed to be offset from each other in at least one direction on the stave body 10 so that the front surface of the stave body 10 is covered.

In addition, the first material constituting the first refractory member 42 is formed of a carbon-based material, that is, a non-carbon material. The second material constituting the second refractory member 43 is made of carbon.

Carbon is characterized by its high thermal conductivity, which is effective for cooling, does not break well at high temperatures, and has a good restrained stress that maintains its bonded state when bonded to a given structure. However, there is a disadvantage that wear resistance is deteriorated.

Therefore, in order to compensate for the disadvantages of the carbon having a low wear resistance, the first material is provided in a non-carbon type rather than a carbon type to secure the strength of the refractory.

For example, the non-carbon based first material may be made of silicon carbide or alumina, and the second material may be carbon-based graphite or carbon. However, it should be understood that the present invention is not limited by the present invention, but may be appropriately modified by those skilled in the art. For the sake of clarity, the following description will be made on the assumption that the first material is silicon carbide, Carbon (carbon), for example, will be described.

The refractory including silicon carbide, graphite and carbon material described above protects the steel body 10 from the high temperature generated in the blast furnace.

Silicon carbide has the advantage of abrasion resistance, but when the temperature rises to 160 degrees in the restrained state, the possibility of thermal expansion and breakage is high. Therefore, in a preferred embodiment of the present invention, the second refractory member 43 including graphite or carbon as the second material is staggered so as to surround the periphery of the first refractory member 42 Respectively.

In other words. Graphite or carbon has good thermal conductivity and flexibility to swell and shrink as temperature rises to compensate for the disadvantages of silicon carbide which is abrasion resistant but has low thermal conductivity and is vulnerable to thermal expansion.

In addition, graphite or carbon, which has the property to hold the restrained state for a long time, is complemented by the disadvantage of the silicon carbide which is difficult to keep the restrained state long while being constrained to the structure, Efficiency and durability can be secured together.

The first refractory member 42 is fixed to the engaging groove 32 and the second refractory member 43 is brought into contact with at least one surface of the first refractory member 42. [ When the second refractory member 43 is brought into contact with the first refractory member 42 in the up, down, left, and right directions, the second refractory member 43 restrains the first refractory member 42 from all directions, The insufficient restraining stress of the member 42 can be more effectively compensated.

When the first refractory member 42 and the second refractory member 43 constructed as described above are disposed inside the blast furnace, the first refractory member 42 is continuously disposed in the circumferential direction or the height direction of the blast furnace, The second refractory member 43 may be disposed immediately below the refractory member 42 in the circumferential direction or the height direction of the blast furnace.

The arrangement and arrangement of the first and second refractory members 42 and 43 may be appropriately modified and applied by those skilled in the art but it is important that the first refractory member 42 and the second refractory member 43 ) Are arranged in a mutually staggered order so as to be in mutual contact with each other, thereby making it possible to compensate for insufficient physical properties.

That is, the second refractory member 43 is staggered with the first refractory member 42, thereby relieving the constraining stress due to the thermal expansion of the silicon carbide, and rapidly lowering the temperature of the refractory due to excellent thermal conductivity. Therefore, the temperature of the refractory can be efficiently controlled, and the strength of the refractory can be prevented from lowering due to temperature rise.

Therefore, the first refractory member 42 and the second refractory member 43 may be staggered from each other in at least one direction in the blast furnace. 4, the first refractory member 42 and the second refractory member 43 are staggered in one coupling groove 32 and the first refractory member (also referred to as the first refractory member) 42 and the second refractory member 43 may be staggered.

5, the first refractory member 42 is fastened to one engaging groove 32 and the second refractory member 43 is fastened to the engaging groove 32 immediately below the first refractory member 42 , And the blast furnace front surface may be covered by repeating this.

It is preferable that the first and second refractory members 42 and 43 have the same height so that the entire surface of the first and second refractory members 42 and 43 can be maintained evenly toward the inside of the blast furnace 1. As a result, it is possible to effectively prevent the stress from concentrating in one place due to the irregular falling of the charge.

Also, if the material of the stave body 10 is made of a copper (Cu) material having excellent cooling ability, it is more effective for cooling the blast furnace 1.

A cooling water inflow pipe 21 for introducing cooling water is provided at one side of the stave body 10 having such a structure and the cooling water inflow pipe 22 is provided to allow the inside of the stave body 10 to flow, The cooling of the blast furnace 1 can be performed efficiently.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be apparent to those of ordinary skill in the art.

1: Blast furnace 10: Stave body
20: cooling line 30:

Claims (7)

A stave body disposed on the inside of the furnace, the furnace body having one side thereof being disposed in contact with or facing the furnace foil of the furnace;
A cooling line provided in the stave body for circulating cooling water therein;
An engaging portion protruding or concave from the stave body; And
And a refractory portion provided with a plurality of members fixed to the other surface of the stave body by the engaging portion and provided so as to cover and protect the stave body,
The refractory portion,
Wherein a plurality of the members are provided so as to be in contact with each other in the outer circumferential direction of the stave body, and the neighboring members are made of different materials.
The method according to claim 1,
The material of the refractory portion is,
Wherein the first material has a greater wear resistance and thermal expansion coefficient than the second material and the second material has a smaller coefficient of thermal expansion than the first material,
Wherein one member is provided with the first material, and the neighboring member is made of the second material in contact with the member.
3. The method according to claim 1 or 2,
The coupling portion
Wherein the stave body is provided on a surface facing the inside of the furnace,
A coupling protrusion protruding at a predetermined height; And
And an engaging groove portion formed to be concave at a predetermined height,
And the edges of the coupling protrusion and the coupling groove are rounded.
The method of claim 3,
The refractory portion,
And a fastening portion corresponding to the shape of the coupling protrusion and the coupling groove, the fastener being inserted into the coupling groove to be fastened to the stave body,
A first refractory member including a first material; And
And a second refractory member including a second material,
Wherein the first refractory member and the second refractory member are staggered from each other to cover the stave body.
The method of claim 3,
The coupling protrusion and the coupling groove may be formed in a substantially rectangular shape,
Wherein the stator body is continuously provided in the circumferential direction or the height direction of the furnace.
3. The method of claim 2,
Wherein the first material comprises
Carbon series,
The second material may be,
Characterized in that it is provided in a carbon-based system.
5. The method of claim 4,
The coupling protrusion and the coupling groove may be formed in a substantially rectangular shape,
A plurality of stator bodies provided in the circumferential direction or the height direction of the furnace,
Wherein the first refractory member and the second refractory member,
Wherein at least one of the circumferential direction and the height direction of the furnace is staggered with respect to one another to cover the front surface of the stave body.

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