JPH08199211A - Cooling disk in blast furnace - Google Patents

Abstract

PURPOSE: To arrange a blast furnace-cooling disks capable of blocking back blasting and preventing the damage of a stave coolers and the deformation of a furnace shell. CONSTITUTION: The cooling disks 3a of wide and thick type shape are arranged and the damage of the stave coolers 2 and the deformation of the furnace shell 1 are prevented by blocking the back blasting 9 to the back surfaces of the stave coolers 2 not by refractory 4 but by metallic material of the cooling disks 3a, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace cooling board, and more particularly to a blast furnace cooling board capable of preventing wear of a stave cooler of a blast furnace and deformation of an iron shell.

[0002]

2. Description of the Related Art In a conventional blast furnace, due to the operation of high pressure and pulverized coal, the lower surface of the stave cooler is particularly worn out by refractory materials.

FIG. 5 is a view showing an installed state of a conventional blast furnace cooling platen.

In the conventional cooling board 3b, if the refractory is worn out and disappears, as shown in FIG. 5 (a), the gap between the cooling board 3b and the stave cooler 2 and cooling as shown in FIG. 5 (b). The gap between the panels becomes large, and the high temperature back wind travels to the back surface of the stave cooler 2 without being blocked by the cooling panel 3b, and the furnace shell 1 is deformed or the stave cooler 2 is damaged.

[0005]

However, in the above-mentioned conventional example, the deformation of the iron skin 1 and the breakage of the stave cooler 2 occur due to the back wind.
It requires about 60 hours of blow-off work.
There is an increase in repair costs and loss of production. In addition to the need to refurbish the equipment due to the subsidence of the furnace body, temporary air blow due to air leaks from the welded part of the furnace body iron-cover plate, and suspension of the shelf due to deformation of the furnace body profile Instability is a serious problem. Therefore, protecting the lower surface of the stave cooler 2 having a high heat load is an urgent technology both in terms of operation and equipment.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blast furnace cooling board which blocks back winds to prevent wear of the stave cooler and deformation of the iron shell to ensure stable operation.

[0007]

In order to achieve the above object, the present invention is arranged in a staggered manner on a lower surface of a stave cooler for protecting a blast furnace iron shell from heat of contents to cool refractory material in the furnace. In the blast furnace cooling plate, a cooling plate having a wide and thick shape that blocks the back wind to the back of the stave cooler is provided.

[0008]

According to the above construction, the shape of the cooling board is wide and thick so that the back air to the back surface of the stave cooler can be blocked. Therefore, the back air to the back surface of the stave cooler is blocked by the cooling board. Wear and deformation of the iron skin can be prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the inside of a blast furnace according to an embodiment of the present invention. In FIG. 1, the iron shell 1 of the blast furnace main body is a large tubular structure made of steel that bears its own load and maintains the profile for the contents to smoothly react and fall, and the stave cooler 2 is It is a water-cooled metal fitting having a shape like a large tatami mat, which is installed inside the blast furnace iron shell 1 to play a role of protecting the blast furnace iron shell 1 from heat of the contents.

The cooling board 3a plays a role of cooling the refractory 4 in the furnace in order to protect the blast furnace iron shell 1 from the heat of the contents, and the water channels are provided inside the blast furnace iron shell 1 in a staggered manner. The refractory 4 is a copper plate, and has a role of protecting the blast furnace shell 1 from heat of the contents, and is a kind of brick or concrete installed inside the blast furnace shell 1.

The tuyere 5 is a water-cooled tubular body made of copper by a nozzle for blowing pulverized coal and hot air into the furnace, and the iron ore 6 is one of the contents of the blast furnace charged from the upper portion. . Coke 7
Similarly, although it is one of the contents of the blast furnace, hot air easily passes through the gaps among the coke 7 blocks among the contents.

The fused body 10 is one in which the iron ore 6 and the coke 7 alternately charged from the top of the blast furnace fall together with the reaction of the lower layer, and eventually become a conical film, and the iron ore 6 is reduced by the reduction reaction. The hot air passes through the gap between the coke 7 chunks because it is in a niche state. Further, the arrow body 8 indicates the flow of the wind, and basically the flow is from the bottom to the top, but especially where hot air passes between the slits of the fusion body 10, the flow of the wind is horizontal. Direction, and a large heat load is applied to the iron shell 1 of the blast furnace.

The back wind 9 is the wind that has circulated to the back surface of the stave cooler 2. The back surface of the stave cooler 2 is initially filled with concrete refractory material 4, but the refractory material 4 is not cracked or worn. As it progresses gradually, it is replaced with red hot coke as an alternative. As a result, the heat load on the blast furnace steel shell 1 due to back winds and the like increases and the steel shell 1 is deformed, resulting in unstable operation. Further, the stave cooler 2 is also deformed and worn due to the increased heat load due to the backside heating, and eventually is damaged. The replacement cost of the stave cooler 2 is enormous.

FIG. 2 is a diagram showing a detailed structure of the cooling board shown in FIG.

FIG. 3 is a view showing a water channel shape of the cooling board shown in FIG.

Next, the details of the cooling board of the present invention will be described with reference to the drawings.

When the cooling board 3a of the present invention is installed afterwards, the outer shape is set in consideration of the fact that the contents and residual refractory can be removed from the lower part of the furnace, and that a construction margin is required. In comparison with the conventional rectangular shape, the entire shape is wide and thick like each dimension B, H, and L.

In FIG. 2, a gap adjusting plate 11a plays a role of adjusting a gap between the stave cooler 2 and the lower surface thereof, and is a plate which is adjusted and fixed by a long hole of the in-furnace suspending bolt 13 and is sprayed and fireproof. A large hole is formed in the central portion so that the stud 12 welded to the cooling plate 3a for supporting the object 4 is exposed. The function of the gap adjusting plate 11a also serves to prevent the adhesion of the sprayed material to the press-fitting material due to the sand-like deposition on the cooling platen 3a.

The studs 12 are for supporting the refractory material 4. The studs 12 may be projections although the effect is reduced. The press fitting pipe 14 is the stave cooler 2.
Plays a role of press-fitting the refractory material 4 on the back surface of the. The leg reinforcing plate 15 is made by attaching a steel plate to the main body of the cooling plate 3a by seal welding. Considering that the refractory 4 remains less, the conventional expansion tube structure is discontinued and fixed to the iron shell 1. It is supposed to be welded to a plate.

Further, the cooling board 3a is provided with a water channel 16 having a shape as shown in FIG. Since the water passage 16 suppresses vaporization of the flowing cooling water and discharges mixed air bubbles,
It has a shape that ensures a flow velocity of 1 m / s. Note that FIG.
3A shows a plan view of the cooling board, FIG. 3B shows a sectional view of the cooling board, and FIG. 3C shows a rear view thereof.

FIG. 4 is a view showing an installed state of the cooling board shown in FIG.

Since the cooling board 3a of the present invention arranged as shown in FIG. 4 has a wide and thick shape, the stave cooler 2 is used.
The space between the and the stave cooler 2 is narrowed to positively prevent the back wind around the back of the stave cooler 2.

By the way, the conventional cooling board 3 shown in FIG.
Due to its shape, b has a large gap between the stave cooler 2 and the cooling plate, so that the back wind 9 is largely borne by the refractory material 4.

In the case of the cooling board 3a of the present invention, FIG.
As shown in FIG. 4, the gap between the stave cooler 2 and each cooling platen is narrowed as shown in FIG. 4 (b), and the cooling platen 3a remains even after the refractory 4 is worn. can do.

Further, since the cigar cooler 11b, which is a cigar-type water-cooled metal object, is attached so as to fill the gap between the cooling plates 3a, the cigar cooler 11b is worn even after the refractory 4 is worn.
Remains and the back wind 9 from the gap between the cooling plates 3a is almost prevented.

As described above, in the present invention, the operation is stabilized and the furnace body is protected by blocking the back wind with the metal such as the cooling plate 3a and the cigar cooler 11b instead of the refractory 4 which wears down. it can.

[0027]

As described above, according to the blast furnace cooling board of the present invention, since the cooling board having the wide and thick shape is provided to block the back wind to the back surface of the stave cooler, the back surface of the stave cooler is provided. There is an effect that the back wind to the front is blocked by a metal object instead of a refractory material, the wear of the stave cooler and the deformation of the iron skin can be prevented, and the operation can be stabilized.

[Brief description of drawings]

FIG. 1 is a diagram showing the inside of a blast furnace according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a detailed structure of the cooling board shown in FIG.

FIG. 3 is a diagram showing a water channel shape of the cooling board shown in FIG.

FIG. 4 is a view showing an installed state of the cooling board shown in FIG.

FIG. 5 is a diagram showing an installation state of a conventional cooling board.

[Explanation of symbols]

 1 Iron Peel 2 Stave Cooler 3a Cooling Board 4 Refractory 5 Tuyere 6 Iron Ore 7 Coke 8 Wind 9 Back Wind 10 Fused Body 11a Gap Adjustment Plate 11b Cigar Cooler 12 Stud 13 Suspended Bolt 14 Press-fitting Pipe 15 Leg Reinforcement plate 16 Cooling channel

Claims (1)

[Claims] 1. A blast furnace cooling board arranged in a staggered manner to cool refractory in the furnace on the lower surface of the stave cooler for protecting the iron shell of the blast furnace from heat of the contents, and blocks back wind to the back of the stave cooler. A blast furnace cooling plate having a wide and thick cooling plate.