KR101585811B1

KR101585811B1 - Furnace and method for delaying abrasion of same

Info

Publication number: KR101585811B1
Application number: KR1020140186173A
Authority: KR
Inventors: 김정일; 정태식; 장영재; 김기수
Original assignee: 주식회사 포스코
Priority date: 2014-12-22
Filing date: 2014-12-22
Publication date: 2016-01-15

Abstract

The present invention relates to a furnace and a method to delay an abrasion thereof. The furnace comprises: a stave installed inside a steel shell; and a consumption member penetrating the steel shell to have an end protruding towards an inner space of the furnace, and placed around at least one front end of the stave. As such, the abrasion is reduced and the lifespan of the stave or furnace extended.

Description

FIELD AND METHOD FOR DELAYING ABRASION OF SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace and a method for delaying wear thereof, and more particularly to a furnace-like furnace, for example, a furnace and its wear-reducing method capable of reducing the wear of the furnace.

It should be noted that the contents described in this section merely provide background information on the present invention and do not constitute the prior art.

The blast furnace is a facility to manufacture iron ore and iron ores by charging iron ore and coke as raw materials and blowing hot air including oxygen in the lower part. These blast furnaces are equipped with cooling stoves inside the steel pipes so that the high temperature inside does not affect the steel pips.

As shown in Fig. 1, such a stove 10 is installed approximately in parallel with the screed 20 of the furnace 1, and includes a cooling piping 12 arranged therein to circulate the cooling fluid. The cooling fluid is circulated through the cooling pipe 12 to cool the internal heat so that the heat is not transferred to the screed 20.

However, the solid solid charge is continuously introduced into the furnace 1, such as a blast furnace, for example, and the inner surface of the furnace is worn during long-term operation. Then, the stove 10 exposed to a high temperature is also damaged by mechanical abrasion.

Particularly, as shown in FIG. 2, according to the result of analyzing the heat transfer of the stave, since the cooling fluid does not reach the both ends of the stave 10, the high temperature region is generated intensively at both ends of the stave, Wear is easily caused by thermal stress.

Moreover, due to such abrasion, the gap between the staves arranged and stacked in the furnace is further widened, and the charge enters through the gap so that wear of the stab placed under the stab starts.

As a result, the stabs around the gap are worn down to a certain thickness and each of the cooling pipes is also broken. As a result, the cooling ability that is lost due to the loss of the cooling ability accelerates the wear of the remainder of the stab or other stabs Causing problems.

Accordingly, it is a main object of the present invention to provide a method for delaying a wear and tear of a furnace capable of reducing the wear of the inside of the furnace by the charge.

According to one aspect of the present invention, there is provided a furnace comprising: a stove installed inside a scion; A consuming member installed to protrude into the inner space of the furnace through one end of the furnace and located around at least one end of the furnace; And a cooling module for cooling the other end of the consumable member exposed or protruded to the outside of the furnace.

According to another aspect of the present invention, there is provided a method for delaying wear of a furnace, comprising: installing a consumable member around at least one tip of a stave in the furnace so that one end of the furnace protrudes into an inner space of the furnace; Cooling the other end of the consumable member exposed or protruding out of the furnace; Measuring a thickness of the stave or a length of the consumable member; And calculating the thickness or length of wear from the measured value and further inserting the consumable member into the furnace by the worn thickness or length.

As described above, according to the present invention, it is possible to reduce the wear, thereby extending the service life of the stave or furnace.

Further, according to the present invention, the durability of the facility is improved, and ultimately, the stability and productivity of the operation can be improved.

1 is a cross-sectional view and an enlarged view showing a state where a cooling stave is installed in a furnace.
2 is a view showing a result of analysis of the heat transfer of the stave.
3 is a cross-sectional view showing a part of a furnace according to the present invention.
Figs. 4 and 5 are front views of a state in which the consumable members of the present invention are arranged inside the furnace. Fig.
6 is a cross-sectional view schematically showing a state in which the consumable member and the sealing member of the present invention are installed.
7 is a front view of the inside of the furnace in a state in which another modification of the consumable member is installed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

3 is a cross-sectional view showing a part of a furnace according to the present invention. As shown therein, the furnace according to the present invention includes a stove 10 installed inside the screed 20; And a consumable member (15) which penetrates through the screed (20) and protrudes from the inner space of the furnace at one end, and is located around at least one end of the stove (10).

A stave 10 is installed inside the iron pipe 20 to protect the iron pipe 20 from the high temperature generated in the furnace. Further, a refractory material (not shown) may be mounted on both sides of the stave, more specifically, toward the inner side of the hearth and the furnace.

The stave 10 is installed in the hearth 20 in the furnace, and is made of a copper (Cu) material excellent in cooling ability. These staves are provided in plural and are continuously stacked up and down on the inner wall of the iron pipe to uniformly cool the iron pipe.

1) for circulating a cooling fluid is provided inside the stave 10 for cooling. An inlet pipe 14 (see FIG. 1) is provided in the cooling pipe so that the cooling fluid can be introduced and discharged. And a discharge pipe 16 (see Fig. 1) are connected.

One side of the stave 10 is fixed to the inner circumferential surface of the screed 20, and a refractory may be interposed between the main body and the screed as described above.

The consumable member 15 constituting the main feature of the present invention is a rod-like member, and can be made of a metal such as copper, iron or the like or a refractory material such as Al ₂ O ₃ , SiC, graphite and the like.

The consumable member 15 is inserted into the through hole 22 formed in the metal foil 20 so that one end thereof protrudes into the inner space of the furnace while the other end thereof exposes or protrudes out of the furnace. At the same time, a plurality of consumable members 15 are arranged at predetermined intervals between adjacent stabs 10.

As shown in FIGS. 4 and 5, the cross-sectional shape of the wear member 15 and the corresponding through-hole 22 may be formed by, for example, a polygon such as a circle, an ellipse, or a rectangle.

In addition, the cross-sectional size of the consumable member 15 and the corresponding through-hole 22 may be varied, as the consumable member has a cross-sectional size smaller than the spacing between the staves as shown in Fig. 4, The cross-sectional size of the staves may be greater than the spacing between the staves. In the case of Fig. 5, it is preferable that a plurality of grooves 18 having a depth or width corresponding to the leading end side of adjacent stabs 10 are formed. It goes without saying that, in a single furnace, a consumable member and a through hole having various sizes can be applied.

Alternatively, the refractory material may be positioned between the thus disposed consumable member 15 and the consumable member 15.

By disposing the consumable member (15) of the present invention around the tip of the stave (10), the other inner surface of the furnace, especially the consumable member protruding from the stave, first wears. Further, when there is a refractory material between the consumable member and the consumable member, wear of the consumable member, which is exposed after the refractory material is first worn, is performed.

Particularly, the wear of the consumable member can be delayed by placing or filling the solid charge on the wear member 15 or between the wear members 15 located around both ends of the stave 10 So that the wear and tear of the stave can be prevented or delayed.

Moreover, since the consumable member 15 of the present invention is installed in a space between the adjacent staves 10, the effect of shielding the gap between the staves is exerted, thereby preventing the inflow of the articles It is possible to delay the wear of the stave 10 placed thereunder.

6 is a cross-sectional view schematically showing a state in which the consumable member and the sealing member of the present invention are installed. As shown therein, the furnace according to the present invention may further include a sealing member 30 covering and sealing the consumable member 15 exposed or protruding out of the furnace.

The sealing member 30 includes a tubular member 32 having a free end fixed around the through hole 22 at the outer peripheral surface of the tubular member 20 and a flange 33 at a free end thereof, And a gasket 35 for hermetic sealing interposed between the flange 33 of the tubular member 32 and the lid 34. [

Referring again to FIG. 3, a state where the consumable member and the cooling module of the present invention are installed can be seen. As shown therein, the furnace according to the present invention may further comprise a cooling module 40 for cooling the consumable member 15 exposed or protruding out of the furnace.

In the illustrated example, the cooling module 40 includes a cooling jacket 42 fixed to cover at least one wear member 15 at the outer circumferential surface of the scrim 20, and a cooling fluid supplied into the cooling jacket 42 And a supply pipe 43 and an outlet pipe 44 connected to be able to flow out. In this case, a sealing member 45 such as an O-ring or a gasket is inserted between the wear member 15 and the through-hole 22 of the screed 20 to prevent the cooling fluid from leaking into the furnace.

Further, a door (not shown) may be formed on one side of the cooling jacket 42, or a cover (not shown) may be provided to cover the opening formed on one side. It is possible to further insert the consumable member into the furnace at the time of abrasion of the consuming member 15, which will be described later, by releasing the door or opening the one side of the cooling jacket by detaching the cover.

By cooling the other end of the consumable member 15 with the cooling module 40 such as a cooling jacket, the entire consumable member can be smoothly cooled by conduction, and thus the heat (heat) The wear rate due to stress can be reduced and the strength can be improved.

The configuration of the cooling module is not limited to the above-described and illustrated examples. For example, the configuration of the cooling module may include a spray nozzle for spraying the cooling fluid to the other end of the consumable member 15 and its surroundings during operation of the furnace.

7 is a front view of the inside of the furnace in a state in which another modification of the consumable member is installed. As shown in the figure, the remaining configuration and operating relationship of the consumable member according to the modified example are the same as those described above, except for the shape thereof. Therefore, in describing the consumable member according to the modified example, the detailed description of its configuration and function will be omitted.

The consumable member 15 'constituting the main feature of the present invention is a plate-shaped member having a predetermined thickness. The consumable member 15' is fitted in a through hole formed in the metal foil 20, And the other end is exposed or protruded out of the furnace. At the same time, at least one consumable element 15 'is located between adjacent staves 10.

Hereinafter, a method of delaying wear of a furnace according to the present invention will be described.

A method for retarding a wear of a furnace according to the present invention is a method for retarding a wear of a furnace comprising the steps of applying a consumable member (15, 15 ') around at least one end of a stave (10) in a furnace so that one end of the furnace .

The method may further include the step of cooling the other end of the consumable member (15, 15 ') exposed or protruding out of the furnace by a cooling module (40) such as a cooling jacket. As a result, the entire consumable member can be smoothly cooled by conduction, thereby reducing the wear rate due to the thermal stress received by the consumable member and improving the strength.

Optionally, it may further comprise inserting the expendable member (15, 15 ') into the furnace by a predetermined length after a certain period of time has elapsed.

Preferably, the thickness of the stave 10 or the inserted length of the wear member 15, 15 'is measured, and the thickness or length of wear is calculated from the measured value, Into the furnace. These worn thicknesses and lengths can be measured periodically or irregularly.

The worn thickness of the stiffener 10 can be measured by inserting an ultrasonic probe, for example, through the inlet pipe 14 or the outlet pipe 16 connected to the cooling pipe 12. Further, the worn length of the wear members 15, 15 'can be measured using, for example, a portable or fixed type ultrasonic probe.

Thus, by measuring the thickness of the stave or the length of the consumable member, the consumable member is pushed into the furnace by the worn amount, so that the length of one end of the consumable member protruding into the inner space of the furnace is kept constant Whereby the wear of the stave can be prevented or delayed.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Stage 12: Cooling piping
15, 15 ': Consumable member 20:
30: sealing member 40: cooling module

Claims

A stave installed on the inside of the wick;
A consuming member installed to protrude into the inner space of the furnace through one end of the furnace and located around at least one end of the furnace; And
A cooling module for cooling the other end of the consumable member exposed to or protruding from the furnace,
Lt; / RTI >

The method according to claim 1,
A through hole is formed in the metal foil,
And the consumable member is fitted in the through-hole.

3. The method of claim 2,
Further comprising a sealing member covering and sealing the other end of the consumable member exposed or protruding out of the furnace.

The method of claim 3,
Wherein the sealing member includes a pipe member fixed around the through hole at the outer peripheral surface of the iron pipe and having a flange at a free end thereof, a lid detachably coupled to the flange of the pipe member, and a lid member between the flange of the pipe member and the lid Characterized in that it comprises an intervening gasket.

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The method according to claim 1,
Wherein the cooling module includes a cooling jacket fixed to cover at least one consumable member on an outer circumferential surface of the iron core and a supply pipe and an outlet pipe connected to allow the cooling fluid to be supplied and discharged in the cooling jacket furnace.

The method according to claim 6,
And a sealing material is inserted between the consumable member and the through hole of the iron pipe.

The method according to claim 1,
Wherein the cooling module includes a spray nozzle for spraying a cooling fluid to the consumable member that is exposed or protruding out of the furnace.

Installing a depletion member around at least one tip of the stave in the furnace such that one end protrudes into the inner space of the furnace through the furnace;
Cooling the other end of the consumable member exposed or protruding out of the furnace;
Measuring a thickness of the stave or a length of the consumable member; And
Computing a thickness or length worn from the measured value and further inserting the consumable member into the furnace by the worn thickness or length;
Of the furnace.

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