JPH08269511A - Structure for laying brick of iron tapping hole - Google Patents

Abstract

PURPOSE: To restrain the invasion of molten iron and slag and the leakage of gas by arranging bricks at the position of an iron tapping hole so that all of joint parts between the bricks become discontinuous at least at one place of the brick. CONSTITUTION: The bricks 1a of the iron tapping hole are arranged on the inner side of the furnace so that the longitudinal direction of the brick is made to coincide with the diameter direction of a furnace. The brick 1b of the iron tapping hole is arranged outside the furnace so that the longitudinal direction of the brick is crossed at a right angle to the diameter direction of the furnace. In this case, the bricks of the iron tapping hole are composed of these layers of the brick lay structure in the height direction and the horizontal surface where the bricks 1a are in contact with each other and the horizontal surface where bricks 1b are in contact with each other are arranged in the discontinuity by shifting about 100mm in the vertical surface where the bricks 1a an the bricks 1b are in contact with each other so that the horizontal joint parts do not come on the straight line. By this method, the iron and slag tapping work is drastically improved and stabilized, and the cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a taphole brickwork structure for a blast furnace hearth wall.

[0002]

2. Description of the Related Art The conventional blast furnace taphole brick-laying structure is described in "Refractory" vol. 43 No. 10, 19
91, P.I. The one shown in 565 is a typical example. This is quoted in FIG. This is a vertical cross-sectional view of a conventional blast furnace taphole brickwork. In the figure, 8a and 8b are taphole bricks, 6 is a furnace body skin, 5 is a taphole housing, and 3 is a taphole.
As shown in the figure, a plurality of medium-sized taphole bricks 8a and small-sized taphole bricks 8b are arranged to form a taphole brick.

[0003]

FIG. 5 shows the state of brick wear at the end of operation when the conventional taphole brick structure is used.
In FIG. 5, reference numeral 9 is a portion in which the brick is abraded and eroded, and the eroded portion is replaced with mud and slag, and 10 is an embrittlement layer. Erosion erosion of bricks is eroded by hot metal and slag, and small bricks in the front part disappear by extrusion of mud.

At the tap hole damaged in this way, the tap hole self-destructs due to the molten pig iron in the furnace coming out through loose brick joints or cracks in the mud wall, and in the same way, in the furnace gas ejected through the brick joint. Roughing of the pig iron increases the number of tapping operations, and the hot metal inserted into the cracks in the mud wall solidifies and the hole breaking phenomenon that makes it impossible to open holes in the hole opening machine increases the oxygen opening work, and brick wear Therefore, in order to secure the depth of the taphole, many problems such as increasing the mud filling amount occurred.

The object of the present invention is to suppress the infiltration of hot metal into the brick joints at the tap hole and the gas leakage from the brick joints.
An object of the present invention is to provide a stable taphole structure capable of coping with tapping work at a stable and low cost by reducing the drawbacks such as an increase in the number of tapping works, an increase in oxygen venting work, and a large use of mud.

[0006]

[Means for Solving the Problems]

(1) In a brick-laying structure of a taphole consisting of two or more layers forming a taphole on the hearth wall of the blast furnace, all joints between bricks horizontal and vertical with respect to the radial direction of the furnace are In this structure, bricks are arranged at the taphole position so as to be discontinuous in at least one brick, and the bricks are piled up so as to be stacked.

(2) The bricks are made so that all joints in the horizontal and vertical directions in the radial direction of the furnace in contact with the opening of the iron shell of the taphole are discontinuous in at least one brick. The taphole brick-laying structure according to (1), characterized in that the bricks are piled up.

(3) The bricks are piled up so that the joints of the bricks in contact with the furnace shell with the bricks adjacent to the inside of the furnace are discontinuous with at least one brick in the radial direction of the furnace. The taphole brick-laying structure according to (1) or (2).

(4) Bricks having through holes provided between the operating surface and the back surface are piled up from the furnace shell side to the inside of the furnace so that the through holes of the bricks are continuous to form a taphole. The taphole brick-laying structure according to any one of (1) to (3).

(5) The taphole brick according to any one of (1) to (4), characterized in that the brickwork forming the taphole is composed of two layers of brick blocks in the radial direction of the furnace. It is a stacked structure. Here, the brickwork in which the joints are discontinuous means brickwork in which the joints are not aligned.

[0011]

[Function] Various causes such as dismantling investigations were conducted to investigate the cause of the large wear of the taphole bricks. As a result, since the molten pig iron flow is concentrated in this part, it is a part that is particularly subject to erosion and wear. It was found that the collapse due to the damage to the taphole brick. As a means to prevent such damage, based on the adoption of high corrosion resistant bricks, the brick block is upsized to enhance the brick holding power, the number of joints is reduced, and the molten pig iron is infiltrated by bricks with proper joint placement. The structure is designed to suppress gas leakage.

That is, in the brickwork structure of the taphole consisting of two or more layers forming the taphole in the hearth wall of the blast furnace, in the joint between the bricks horizontal and vertical with respect to the radial direction of the furnace. All of them are bricks at least at one place, and the bricks were placed at the taphole position so that the bricks were discontinuous with a size of 30 mm to about half the size of the brick pile. Intrusion of molten pig iron and gas clique can be suppressed in the continuous brick part.

The opening of the iron body shell for tapping is the only opening in the blast furnace body filled with high-pressure gas, but it is in contact with the opening of the iron shell for tapping. By stacking bricks so that the horizontal joints and the vertical joints are all discontinuous with at least one brick,
Especially, gas creek is suppressed.

In addition, the bricks piled up so that the joints in the radial direction of the bricks which are closest to the inner side of the furnace of the bricks closest to the iron shell side are discontinuous with at least one brick Even after the hot metal brick erosion, the joint discontinuity remains stable.

The method of laying bricks discontinuously by shifting bricks is carried out by laying bricks by changing the size of adjacent bricks. In addition, bricks with through holes between the operating surface and the back surface were piled up from the furnace shell side to the inside of the furnace so that the through holes of the bricks were continuous to form a tap hole. The brick-filled joint in the same direction as the opening direction of the piggyhole and the opening that forms the tap hole were cut off to prevent the infiltration of hot metal and gas mixture through the joint.

Further, since the brick stack forming the taphole is composed of two layers of brick blocks in the radial direction of the furnace, the number of joints of the brick structure forming the taphole is reduced, and the effectiveness of large bricks is improved. It has a strong brick retaining power structure.

As described above, according to the present invention, since there are few joints for brickwork and the inside and outside of the furnace are not connected through the joints in a straight line, it is possible to suppress the infiltration of molten pig iron and the gas creek. Became possible. In addition, since the taphole opening was also cut off from the brickwork joint in the same direction as the taphole opening direction, it was possible to obtain a stable taphole condition with little gas mixture.

[0018]

Embodiments of the present invention will be described in detail with reference to FIGS. 1, 2 and 3. FIG. 1 is a vertical sectional view of a taphole brick-laying structure according to the present invention, FIG. 2 is a horizontal sectional view of a taphole brick-laying structure according to the present invention (middle position), and FIG. 3 is a taphole brick-laying structure according to the present invention. FIG. 3 is a vertical sectional view seen from the inside of the furnace.
1a and 1b are taphole bricks, 2 is a tap wall brick, 3 is taphole, 4 is taphole housing brick, 5 is taphole housing, 6 is furnace shell, 7 is stave cooler is there. Of these, the taphole brick 1a is a taphole brick arranged inside the furnace with the longitudinal direction of the brick aligned with the radial direction of the furnace. The taphole brick 1b is a taphole brick arranged outside the furnace with the longitudinal direction of the brick being orthogonal to the radial direction of the furnace.

In this embodiment, as shown in FIG. 1, a brick-laying structure of three layers is arranged in the height direction, and a horizontal surface where the taphole bricks 1a contact each other and a horizontal surface where the taphole bricks 1b contact each other. The vertical plane is a vertical plane where 1a and 1b are in contact with each other, and the planes are discontinuously arranged by shifting about 100 mm so that horizontal joints do not pass in a straight line.

Further, as shown in FIG. 3, the taphole brick 1a
The vertical planes in contact with each other are discontinuous by arranging the horizontal planes in which 1a are in contact with each other by shifting about 300 mm so that the vertical joints do not pass in a straight line. In addition, as shown in FIG. 2, the vertical surface where the taphole bricks 1a are in contact with each other is a vertical surface which is in contact with the taphole brick 1b, and the upper and lower stages are displaced by about 700 mm, and the middle stage is displaced by about 400 mm. They are arranged so that they are discontinuous so that vertical joints do not go straight.

In this embodiment, as shown in FIG. 1, the opening portion of the tap hole is formed by combining bricks having a through hole communicating with the working surface and the back surface thereof in one block. As a result, the opening portion is cut off from the horizontal brick joint that directly leads to the inside of the furnace. In this embodiment, as shown in FIG. 1 and FIG. 2, a brick stacking structure composed of two layers of brick blocks in the radial direction of the furnace is used to maximize the advantage of a large brick block that holds bricks firmly. There is.

With the taphole structure of the present invention, the erosion of the brick joints at the taphole portion due to the hot metal and the gas creek from the brick joints are suppressed. Oxygen opening work at the pig iron was reduced from 104 times / month to 4 times / month, and the mud filling amount was 253 kg / time to 149 k
It decreased to g / time, and the number of tapping was 10.4 times / day to 9.2.
Reduced times / day.

[0023]

In the taphole structure of the present invention, a large brick block is used to enhance the brick holding power, the number of joints is reduced, and the bricks are piled with a proper joint arrangement to infiltrate the molten pig iron,
Due to the structure that suppresses gas leak, the work of tapping and slag is greatly improved and stabilized, the cost is reduced and the economic effect is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a taphole brick-laying structure according to the present invention.

FIG. 2 is a horizontal sectional view (middle position) of the taphole brick-laying structure according to the present invention.

FIG. 3 is a longitudinal sectional view of the taphole brick-laying structure according to the present invention as seen from the inside of the furnace.

FIG. 4 is a vertical cross-sectional view of a typical example of a taphole brick-laying structure.

FIG. 5 is a vertical cross-sectional view showing a brick wear state at the end of operation when using a conventional taphole brick structure.

[Explanation of symbols]

1a, 1b taphole brick (large) 2 hot water pool wall brick 3 taphole 4 taphole housing brick 5 taphole housing 6 furnace body skin 7 stave cooler 8a taphole brick (medium) 8b taphole Mouth brick (small size) 9 Part where brick is worn and eroded, and the eroded part is replaced with mud and slag 10 Brick, embrittled part of mud 11 Gas leak route

Claims (5)

[Claims] Claim: What is claimed is: 1. In a brickwork structure of tapholes having two or more layers forming tapholes on the hearth wall of a blast furnace, a joint between bricks horizontal and vertical to the radial direction of the furnace is provided. A brick construction structure for tapholes, characterized in that bricks are arranged at the taphole position so that all bricks are discontinuous in at least one place, and are piled up. 2. The bricks are piled up so that all joints in the horizontal and vertical directions in the radial direction of the furnace which are in contact with the opening of the iron shell of the taphole furnace are discontinuous in at least one brick. The taphole brickwork structure according to claim 1. 3. The bricks are piled up so that the joints of the bricks in contact with the iron shell of the furnace body in the furnace radial direction with the bricks adjacent to the inside of the furnace are discontinuous at at least one brick. The taphole brick-laying structure according to claim 1 or 2. 4. A brick having a through hole between an operating surface and a back surface of the brick is stacked from the iron shell side of the furnace body to the inside of the furnace so that the through hole of the brick is continuous to form a taphole. The taphole brick-laying structure according to any one of claims 1 to 3. 5. The taphole brickwork structure according to claim 1, wherein the brickwork forming the taphole comprises a brick block having two layers in a radial direction of the furnace.