KR20030042084A - A cooler for the end of life type in furnace - Google Patents

Abstract

PURPOSE: Furnace life end type cooling plates in blast furnace are provided which are capable of preventing wear of the cooling body due to descending flow of charging materials and ascending flow of gas generated in the blast furnace and easily adhering repairing material for repairing the furnace wall to the front end of the furnace wall. CONSTITUTION: In cooling plates a plural of which are installed in the furnace wall of blast furnace (100) consisted of metal case (105) and firebrick (104) to cool the body of the blast furnace, the furnace life end type cooling plates in the blast furnace comprise a cooling body (2) which is buried under the firebrick (104) and equipped with cooling pipe (4) for circulating cooling water to reduce thermal load of the furnace wall; and a head part (3) integrally compression molded with connection rings (5) installed on the vertical plane of the front end of the cooling body (2) and formed in a cross shape to improve bonding force of the refractories, wherein the front end of the head part (3) is formed in a round shape to ease workability during attachment or detachment of the cooling plates, absorb descending impact of charging materials and proceed the gas smoothly as minimizing friction with ascending flow of gas.

Description

A COOLER FOR THE END OF LIFE TYPE IN FURNACE}

The present invention relates to a normally-type cooling panel installed in the furnace wall of the blast furnace, and more specifically, the refractory brick constituting the furnace wall of the blast furnace is damaged when the damage to the end of the furnace wall thickness of the furnace wall falling and the rising gas stream The present invention relates to a normally-type blast furnace of an improved blast furnace to protect the cooling plate from preventing melting and to smoothly carry out the attachment of the repair material during repair of the furnace wall.

In general, the blast furnace 100 for manufacturing molten steel in a steel mill is composed of a steel bar 105 constituting the outer wall of the main body and a refractory brick 104, which is a refractory material built on the inner surface thereof, as shown in FIG. The molten steel is prepared by melting iron ore, which is charged as a heat source.

In this blast furnace, a plurality of cooling panels 103 are employed as a cooling device for preventing abrasion of the refractory bricks 104 constructed on the inner surface of the steel bar 105, and the cooling panels 103 are the refractory bricks 104. Cooling pipe body 103a embedded between the cooling panel 103a and a cooling line 103b connected to an unshown supply line for supplying cooling water from the outside and connected to an unshown discharge line for discharging the heat-exchanged cooling water to the outside. ), The cooling panel (! 03) is installed in the blast furnace body by 2500 pieces so as to extend the life of the equipment.

However, in the conventional cooling panel 103, as the number of operating years increases, the friction generated while colliding with the charged material being charged into the blast furnace 100 and the chemistry due to the gas generated inside the blast furnace 100 are caused. The refractory brick 104 is eroded and worn by the reaction.

At this time, the cooling panel 103 is exposed by protruding into the furnace, the cooling panel body 103 of the cooling panel 103 protruding into the furnace is a high temperature generated in the blast furnace 100, by a heat source of about 1500 ℃. In particular, the end portion of the cooling half body 103a receives heat load and is melted while intensively receiving heat load. In the case of melting of the cooling half body 103a, the cooling tube 103b installed therein is exposed while the cooling water is exposed to high temperature. As it vaporizes due to heat, it causes a decrease in its own cooling capacity, increases the damage of the cooling panel, and causes damage due to wear and casting defects due to prolonged use.

The cooling plate 103 continuously melted as described above is left to cool the cooling plate 103 as it is while the supply of cooling water is blocked through the cooling pipe 103b until regular repair work of the blast furnace body. The wear of the van 103 was further increased, thereby prematurely worn the refractory brick 104 around the damaged cooling panel 103 to shorten the service life of the blast furnace.

In addition, when the temperature of the steel bar 105 around the molten cooling plate 103 rises rapidly to cause thermal deformation of the steel bar 105 constituting the furnace body, if the thermal deformation is severely generated, the case of the steel bar 105 A crack caused a large equipment accident.

In addition, the blast furnace gas is ejected to the outside between the gap between the melted cooling panel 103 or the cooling panel 103 is completely melted and the blast furnace charge (iron ore + coke) is ejected to the outside to secondary secondary facilities It caused an accident and fire.

That is, as the number of years of operation of the blast furnace 100 increased, the remaining length of the furnace refractory brick (L) was 850 mm at the beginning of the operation, while the remaining length of the furnace refractory brick (L) was reduced to 150 mm to 200 mm at the end of the operation. The tip of the cooling panel 103 installed in the main body of the 100 is exposed to the furnace, causing frequent meltdowns, resulting in increased work load and significantly lowering the cooling capacity of the furnace. Caused.

In the prior art for solving this problem, in order to minimize the portion where the cooling panel 103 protrudes into the blast furnace at the end of the operation, the cooling panel 103 having a length of 750 mm at the time of the initial design was first reduced to 650 mm and second to 500 mm. Replaced when replacing a damaged cooling panel. However, this has a limit in reducing the length of the cooling plate 103, the inner and bricks 104 are damaged a lot, so that the cooling plate 103 protrudes more than 300mm into the blast furnace is inevitable.

In addition, there is a method of pressing and repairing refractory material in the cooling pipe 103b of the molten cooling plate 103, but this also has a problem that cannot be a fundamental solution as a temporary measure.

In Japanese Patent Application Laid-open No. Hei 7-118714, the blast furnace contents are reduced and vented to below the furnace wall repair area, and the refractory plate is concentrated by spraying atypical refractory to the protruding part of the cooling plate. I was using a method of protection. However, in this method, when the length of the protruding cooling plate is long, it is difficult to cover the protruding portion with the amorphous refractory material. Will be eliminated. Therefore, this method has a problem of repeatedly performing the furnace wall repair work of the amorphous refractory, there was a lot of difficulties in the out-of-furnace discharge of the alumina (Al2O3) component of the dropped refractory.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the object of which is to prevent the molten metal of the body due to the falling flow of the charges falling from the top to the bottom and the rising flow of gas generated in the blast furnace In order to provide a blast furnace normally-type cooling panel that can be easily attached to the distal end during spraying of the refrigerating material for repairing the furnace wall.

1 is a cross-sectional view showing a general blast furnace and a cooling plate equipped therewith;

Figure 2 is a detailed view showing the blast furnace equipment employing a normally-type cooling plate of the blast furnace according to the present invention,

Figure 3 (a) (b) is a cross-sectional view and a perspective view showing a normal type cooling plate of the blast furnace according to the present invention,

Explanation of symbols on the main parts of the drawings

1 ...... Cooling Unit 2 ...... Cooling Body

3 ...... Head 4 ...... Cooling tube

5 ...... link 100 .... blast furnace

104 .... Refractory Brick 105 ....

As a technical configuration for achieving the above object, the present invention,

In the cooling panel which is equipped with plural in the furnace wall of the blast furnace which consists of iron shell and a firebrick, and cools a furnace body,

The cooling body is buried in the refractory brick and is provided with a cooling body for reducing the heat load of the furnace wall by having a cooling pipe circulating and supplying the cooling water, and is installed in a cross shape so as to be installed on the front end surface of the cooling body to improve the binding force of the refractory material. By providing a normally-type cooling plate of the blast furnace, characterized in that it comprises a head portion that is molded integrally with the connecting ring.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figure 2 is a detailed view showing the blast furnace equipment employing the normally-type cooling plate of the blast furnace according to the present invention, Figure 3 (a) (b) is a cross-sectional view and perspective view showing the normally-type cooling plate of the blast furnace according to the present invention. to be.

As shown in Figs. 2 and 3 (a) and (b), the cooling panel 1 of the present invention is replaced and mounted on the end wall in which the furnace wall consisting of the firebrick 104 and the shell 105 is thinned and the thermal load of the furnace wall. It is composed of a cooling body (2) and the head portion (3) so as to prevent the melted by the downward flow of the charge and the upward flow of the gas.

That is, by reducing the heat load of the furnace wall, the cooling body 2 is provided with a forming length l1 such that it is buried in the refractory brick 104 remaining at the end of the blast furnace 100, and is supplied with cooling water from the outside. , The cooling pipe (4) for discharging the heat exchanged cooling water to the outside is installed in the body.

The cooling body 2 is composed of pure copper (Cu: 99.9% or more), and the thickness between the cooling tube 4 and the outer surface is provided to about 15mm.

In addition, the head part 3 includes a plurality of connecting rings 5 on the tip vertical surface 2a of the cooling body 2 corresponding to the furnace, and is composed of refractory molded in the connecting ring 5.

Here, the connecting ring 5 is preferably provided in a crisscross shape so as to improve the coupling force during the compression molding of the head portion 3, the tip of the head portion 3 when the cooling panel is installed or taken out of work It is easy to absorb and absorbs the falling impact of the charge, and it is equipped in the form of a rounding (rounding) so that the gas can advance the rising flow with minimal friction.

In addition, the head portion (3) provided in the middle, upper region (R1) of the furnace body of the blast furnace is composed of a refractory material of the same components as the repairing material to facilitate the attachment of the repairing material is most frequently exposed and sprayed during the furnace wall repair work. Should be.

In addition, the head portion 3 provided in the furnace lower and middle region R2, which is the upper portion of the softening fusion zone 107 of the blast furnace, has alumina (AL203) resistant to water when the cooling water is flooded in the furnace due to the melting of the cooling body 2. It consists of a refractory of a component.

In addition, the head portion 3 provided in the furnace lower region R3 which is the softening fusion zone 107 of the blast furnace is heat and erosion at the place where high heat generation and erosion of the firebrick 104 are most active. It is composed of refractory material of SiC system so as to be strong.

The operation and effects of the present invention having the configuration as described above will be described.

When the number of years of operation of the blast furnace 100 increases and corrosion of the refractory brick 104 constituting the furnace continues, and the remaining refractory brick length L becomes shorter than 500 mm, the cooling body is exposed to the furnace to form the cooling body. Cooling panel 103 having a diameter of 500 mm or more is melted.

Accordingly, a work is performed to replace the conventional cooling plate 103, which has been used in the end-life of the refractory brick remaining length shorter than 500 mm, with the new cooling plate 1 of the present invention.

That is, when the blast furnace operation continues and the furnace inner wall is gradually damaged to shorten the remaining brick length L, which constitutes the furnace body, the cooling panel 1 has a shorter forming length than that of the refractory brick remaining L during the replacement operation. (1) is integrally compression molded via a cooling body (2) disposed on the refractory brick (104) and a connecting ring (5) provided at its tip vertical surface (2a), and is made of a refractory head. Since the furnace body is composed of (3), the heat load is reduced by the cooling water circulated and supplied through the cooling pipe 4 provided in the cooling body 2.

When the head part 3 compression-molded integrally with the tip of the cooling body 2 is exposed to the furnace by the continuous blast furnace operation, the tip of the head part 3 is rounded and supplied from the top to the bottom. It is possible to absorb the shock caused by the charged material, and to prevent the tip of the cooling body 2 from being melted by the rising flow of gas generated in the furnace.

According to the present invention as described above, the remaining length of the refractory brick is shortened by the continuous blast furnace operation and consists of a cooling body and a compression molded refractory body having a ring connected to the distal end of the cooled cooling panel, and the tip is rounded. By replacing it with a new cooling panel composed of a head part, the furnace body is cooled by a cooling body with a built-in cooling tube, thereby reducing the heat load on the furnace wall, absorbing the impact of the charges lowered by the head part, and cooling by the gas flow inside the furnace. It is possible to extend the service life of the front end of the body by preventing the damage of the front end, while the external parts of the head exposed during the renovation of the furnace are composed of the same components as the repairing material, so that the spraying of the repairing material can be easily attached, thereby extending the overall life of the blast furnace. Effect is obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (5)

In the cooling panel which is provided with a plurality of furnace walls of the blast furnace 100 composed of the bark 105 and the firebrick 104 to cool the furnace body, The cooling body 2 is buried in the refractory brick 104 and provided with a cooling pipe 3 through which cooling water is circulated, and is installed on the cooling body 2 to reduce the heat load of the furnace wall, and on the front end surface 2a of the cooling body 2. And a head portion (3) of the blast furnace, characterized in that it comprises a head portion (3) integrally compressed with the connecting ring (5) is provided in a crisscross form to improve the binding force of the refractory. The method of claim 1, The front end of the head portion 3 is characterized in that it is equipped with a rounding form so as to absorb the falling impact of the charge while advancing workability during the installation or removal of the cooling plate, and to allow the gas to proceed with a minimum of friction. Blast furnace type cooling panel. The method of claim 1, The head part 3 provided in the middle and upper region R1 of the furnace body of the blast furnace is composed of a refractory material having the same composition as that of the repair material to facilitate attachment of the repair material sprayed during the furnace wall repair work. Normal type cooling panel. The method of claim 1, The head part 3, which is provided in the lower middle area R2 of the softening fusion zone 107 of the blast furnace, has an alumina (AL203) component that is resistant to water when the cooling water is flooded in the furnace due to melting of the cooling body 2. The blast furnace normal type cooling panel, characterized in that consisting of refractory. The method of claim 1, The head portion 3 provided in the furnace lower region R3, which is the softening fusion zone 107 of the blast furnace, is resistant to heat and erosion at a place where high heat generation and erosion of the firebrick 104 are most active. The blast furnace normally-type cooling panel is characterized by consisting of refractory materials of SiC system.