JPH06331279A - Bottom-blowing converter - Google Patents

Abstract

PURPOSE:To lessen the number of times of repairs accompanying melting damages and thereby to reduce work fo the repairs by providing a gas flow direction changing means whereby the direction of flow of gas flowing through refractory for bottom blowing is changed toward the side being off the part of a converter wall. CONSTITUTION:In a bottom blown converter 1 wherein a mass brick 5 is provided in converter bottom bricks 4 constituting a converter bottom part 2 and also refractory 6 for bottom blowing is provided in the virtually central part of the mass brick 5, shaped refractory 11 is provided above and off the refractory 6 for bottom blowing, as a gas flow direction changing means for changing the direction of flow of gas 10 flowing out through the refractory 6 for bottom blowing. The shaped refractory 11 is buried in the lower end part of a stamp material 9 provided in a space from a converter wall part 3 to the converter bottom part 2 and being monolithic refractory. Accordingly, the gas 10 flowing out through the refractory 6 for bottom blowing flows with its directions changed toward the side being off the converter wall part 3. Thereby early melting damages of the stamp material 9 and also of the mass brick 5, the refractory 6 for bottom blowing, etc., are prevented and the number of times of repairs of the bottom blowing converted 1 can be lessened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in furnaces such as electric furnaces and refining furnaces, and more particularly to improvements in bottom blowing furnaces having bottom blowing refractory in the hearth portion.

[0002]

2. Description of the Related Art FIG. 1 shows a structure of a general electric furnace as an example of a bottom blowing furnace. The electric furnace 1 has a hearth portion 2 and a hearth wall portion 3 and has a hearth. A hearth brick 4 which constitutes part 2 is provided with a mass brick 5, and a refractory for bottom blowing (porous brick) 6 is provided approximately at the center of the mass brick 5.
Is installed, and the ventilation holes 6a formed in the bottom blowing refractory 6 are communicated with the ventilation box 8, so that the gas supplied from the ventilation box 8 is vented to the ventilation holes 6 of the bottom blowing refractory 6.
It has a structure in which it flows from a into molten steel.

In such a bottom blowing furnace 1, in order to increase the ratio (H / D) of the depth (H) to the inner diameter (D) of the furnace, as shown in FIG. Slug line S. L. From the upper part to the hearth brick 4,
A stamp material 9 which is an irregular refractory material may be provided.

[0004]

However, in the case where the stamp material 9 is thus provided as shown in FIG. 8, when the gas 10 is let out from the bottom blowing refractory 6 into the molten steel, the stamp material 9 is provided. 9 is gradually eroded, and at the same time, the bottom blowing refractory 6 and the surrounding refractories are gradually eroding, and as shown in FIG. 9, the stamp material 9 and the mass brick 5 and the bottom blowing refractory 6 are melted. There is a problem that the loss becomes large, there is a problem that the number of times the furnace is repaired increases, and the operating efficiency of the furnace decreases, and the problem is to reduce or eliminate such problems. Was there.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and in a bottom blowing furnace having a bottom blowing refractory in the hearth portion, a stamp is applied from the furnace wall portion to the hearth portion. Material is provided and even when the gas is allowed to flow from the bottom blowing refractory in the hearth part into the molten steel,
The purpose is to reduce the melting loss of stamp materials and bottom-blown refractories, and to reduce the number of furnace repairs required due to melting loss, thus reducing the repair work. I am trying.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a bottom blowing furnace having a bottom blowing refractory in the hearth portion, and a gas flowing through the bottom blowing refractory is directed to the side away from the furnace wall portion. It is characterized in that a configuration is provided with a gas flow direction changing means for changing the gas flow direction.

In the embodiment of the bottom blowing furnace according to the present invention, the gas flow direction changing means is installed above the bottom blowing refractory at an appropriate height, and the flow of the gas flowing out through the bottom blowing refractory is flowed. It may consist of a shaped refractory that changes direction.

Also, in the same embodiment, the gas flow direction changing means is provided on the bottom blowing refractory and has a fixed shape having one or a plurality of ventilation holes for changing the flow direction of the gas flowing through the bottom blowing refractory. It may be made of refractory material.

Also, in the same embodiment, the gas flow direction changing means is provided on the bottom blowing refractory and has a breathable fixed shape such as a porous material for changing the flow direction of the gas flowing through the bottom blowing refractory. It may be made of refractory material.

Furthermore, in the same embodiment, the gas flow direction changing means is a fixed or irregular shape installed on the bottom blowing refractory and having a thin tube embedded therein for changing the flow direction of the gas flowing through the bottom blowing refractory. Of refractory.

[0011]

According to the present invention, in a bottom blowing furnace having a bottom blowing refractory in the hearth portion, the gas flow direction for changing the flow direction of the gas flowing through the bottom blowing refractory to the side away from the furnace wall portion. Since the changing means is provided, the gas flowing into the molten steel through the bottom blowing refractory flows to the side away from the furnace wall portion, so a stamp material is provided from the furnace wall portion to the hearth portion. Even in this case, the stamp material is less likely to be melted and damaged. Therefore, the number of times the furnace is repaired is reduced and the repair work is reduced.

[0012]

2 and 3 show an embodiment of the present invention, which has a hearth portion 2 and a hearth wall portion 3 as shown in FIG. 1, and constitutes the hearth portion 2. In a bottom blowing furnace 1 in which a hearth brick 4 is provided with a mass brick 5 and a bottom blowing refractory 6 is provided in a substantially central portion of the mass brick 5, the bottom is provided above the bottom blowing refractory 6. The case where a fixed refractory 11 is provided as a gas flow direction changing means for changing the flow direction of the gas 10 flowing out through the blowing refractory 6 is shown.

In this case, the fixed refractory material 11 is embedded in the lower end portion of the stamp material 9 which is an irregular shaped refractory material provided from the furnace wall portion 3 to the hearth portion 2.

Therefore, since the gas 10 flowing out through the bottom blowing refractory 6 has the fixed refractory 11 as the gas flow direction changing means above it, the furnace wall portion 3
The stamp material 9, the mass bricks 5, and the bottom blowing refractory material 6 are changed because they flow in a direction away from each other.
As a result, it is possible to prevent early melting damage and the like, and the number of repairs of the bottom blowing furnace 1 is reduced, so that the production efficiency is significantly improved.

FIG. 4 shows another embodiment of the present invention, which has a hearth portion (2) and a hearth wall portion (3) as shown in FIG. In the bottom blowing furnace (1), in which the bottom brick 4 is provided with the mass brick 5 and the bottom blowing refractory 6 is provided substantially in the central portion of the mass brick 5, the bottom blowing refractory 6 is placed on the bottom blowing furnace 6. 1 shows a case where a fixed refractory 11 having a hollow inverted L-shaped vent hole 11a is provided as a gas flow direction changing means for changing the flow direction of the gas flowing through the bottom blowing refractory 6.

In this case, the downward opening portion of the inverted L-shaped ventilation hole 11a formed in the regular refractory 11 is
It is sized to fit on the upper end of the bottom blowing refractory 6 protruding from the mass brick 5, and has a structure mounted on the mass brick 5.

Therefore, since the gas flowing through the bottom blowing refractory 6 has the fixed refractory 11 as the gas flow direction changing means placed above the bottom blowing refractory 6, Since it flows through the formed reverse L-shaped ventilation hole 11a while changing its direction to the side away from the furnace wall portion (3), the stamp material (9) and the mass brick 5 and the bottom blowing refractory 6 etc. Melt loss is prevented, and the number of repairs of the bottom blowing furnace (1) is reduced, so that the production efficiency is significantly improved.

In particular, since the bottom blowing refractory 6 is difficult to come into contact with molten steel by placing the fixed refractory 11 thereon, the service life of the bottom blowing refractory 6 is remarkably improved. When the standard refractory 11 is melted and damaged, only the refractory 11 needs to be replaced, which is extremely advantageous in terms of material, man-hour and cost.

FIG. 5 shows still another embodiment of the present invention, which has a hearth portion (2) and a hearth wall portion (3) as shown in FIG. 2) The hearth bricks 4 that compose 2) are provided with the mass bricks 5 and the mass bricks 5
In a bottom blowing furnace (1) in which a bottom blowing refractory 6 is provided in the substantially central portion of the above, a gas for changing the flow direction of the gas flowing through the bottom blowing refractory 6 on the bottom blowing refractory 6 Fixed refractory 11 having porous portion 11b as flow direction changing means
Is shown.

In this case, the lower end portion of the porous portion 11b formed in the standard refractory 11 is formed to have a diameter that fits into the upper end of the bottom blowing refractory 6 protruding from the mass brick 5. The structure is placed on the brick 5.

Therefore, since the gas flowing through the bottom blowing refractory 6 has the fixed refractory 11 as the gas flow direction changing means placed on the top of the bottom blowing refractory 6, Since the force is weakened through the formed porous portion 11b and the molten steel flows easily to the side away from the furnace wall portion (3), the stamp material (9), the mass brick 5 and the bottom blown. The early melting damage of the refractories 6 for the furnace will be prevented, and the bottom blowing furnace (1)
By reducing the number of repairs, the production efficiency will be improved.

Further, the bottom blowing refractory 6 is hard to come into direct contact with the molten steel, so that the life is greatly improved.

FIG. 6 shows still another embodiment of the present invention, which has a hearth portion (2) and a hearth wall portion (3) as shown in FIG. 2) The hearth bricks 4 that compose 2) are provided with the mass bricks 5 and the mass bricks 5
In a bottom blowing furnace (1) in which a bottom blowing refractory 6 is provided in a substantially central part of the above, a gas for changing the flow direction of the gas flowing through the bottom blowing refractory 6 is provided The case where the fixed refractory 11 having the inverted L-shaped porous portion 11b is provided as the flow direction changing means is shown.

In this case, the downward opening of the inverted L-shaped porous portion 11b formed on the regular refractory 11 is formed to have a diameter that fits into the upper end of the bottom blowing refractory 6 protruding from the mass brick 5. The structure is such that the mass brick is placed on top of it.

Therefore, since the gas flowing through the bottom blowing refractory 6 has the fixed refractory 11 as the gas flow direction changing means placed on the top of the bottom blowing refractory 6, Since it flows through the formed reverse L-shaped porous portion 11b while changing its direction to the side away from the furnace wall portion (3), the stamp material (9), the mass brick 5, the bottom blowing refractory material 6 and the like can be quickly discharged. Melt loss is prevented, and the number of repairs of the bottom blowing furnace (1) is reduced, so that the production efficiency is significantly improved.

FIG. 7 shows still another embodiment of the present invention, which has a hearth portion (2) and a hearth wall portion (3) as shown in FIG. 2) The hearth bricks 4 that compose 2) are provided with the mass bricks 5 and the mass bricks 5
In a bottom blowing furnace (1) in which a bottom blowing refractory 6 is provided in a substantially central portion of the tube, a thin tube 1 extending vertically in the bottom blowing refractory 6
1c is provided, and the thin tube 11c is provided on the bottom blowing refractory 6 as a gas flow direction changing means for changing the flow direction of the gas flowing through the thin tube 11c provided in the bottom blowing refractory 6. The figure shows a case where a fixed refractory 11 embedded in an inverted L shape is provided.

In this case, the peripheral portion of the regular refractory material 11 through which the thin tube 11c passes is formed as a concave portion which fits into the upper end of the bottom blowing refractory material 6 projecting from the mass brick 5, and the mass brick. It is structured to be placed on top of 5. Further, the thin tube 11c may be embedded only in the fixed refractory 11 so that the tip thereof fits into the hollow hole formed in the bottom blowing refractory 6, and the fixed refractory 11 has the irregular refractory. The object 11 may be used, and a plurality of thin tubes 11c may be embedded.

Therefore, the thin tube 11 in the bottom blowing refractory 6
c or the gas flowing through the hollow hole is the bottom blowing refractory 6
An inverted L-shaped thin tube 11 as a gas flow direction changing means at the upper part of the
Since the refractory material 11 in which c is embedded is placed, the reverse L
Since it flows through the narrow tube 11c in a direction away from the furnace wall portion (3), the stamp material (9), the mass brick 5 and the bottom blowing refractory 6 are prevented from being melted at an early stage. As a result, the number of repairs of the bottom blowing furnace (1) is reduced and the production efficiency is improved.

Also in this case, since the molten steel is less likely to contact the bottom blowing refractory 6, the life of the bottom blowing refractory 6 is significantly extended.

[0030]

According to the present invention, in a bottom blowing furnace having a bottom blowing refractory in the hearth portion, a gas that changes the flow direction of the gas flowing through the bottom blowing refractory to the side away from the furnace wall portion. Since the flow direction changing means is provided, the stamp material is provided from the furnace wall portion to the hearth portion, and even when the gas is allowed to flow from the bottom blowing refractory in the hearth portion into the molten steel. It is possible to reduce melting loss of stamp material, bottom blowing refractory and refractory around this, and it is possible to reduce the number of furnace repairs due to melting loss and reduce repair work. Remarkably excellent effect is brought about.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing the structure of a general electric furnace.

FIG. 2 is an explanatory sectional view showing a bottom blowing refractory portion of a bottom blowing furnace according to an embodiment of the present invention.

FIG. 3 is an explanatory view of a slope of FIG.

FIG. 4 is a sectional explanatory view showing a bottom blowing refractory portion of a bottom blowing furnace according to another embodiment of the present invention.

FIG. 5 is a sectional explanatory view showing a bottom blowing refractory portion of a bottom blowing furnace according to still another embodiment of the present invention.

FIG. 6 is a cross-sectional explanatory view showing a bottom blowing refractory portion of a bottom blowing furnace according to still another embodiment of the present invention.

FIG. 7 is a cross-sectional explanatory view showing a bottom blowing refractory portion of a bottom blowing furnace according to still another embodiment of the present invention.

FIG. 8 is an explanatory cross-sectional view of a conventional bottom blowing furnace in which a stamp material is provided from a furnace wall portion to a hearth portion.

9 is a cross-sectional explanatory view showing a state in which the stamp material shown in FIG. 8 is melted and damaged.

[Explanation of symbols]

1 Bottom Blowing Furnace 2 Hearth Part 3 Hearth Wall 4 Hearth Brick 5 Mass Brick 6 Bottom Blowing Refractory 9 Stamping Material 10 Gas 11 Fixed Refractory or Irregular Refractory (Gas Flow Direction Changer) 11a Vent 11b Porous part 11c thin tube

Claims (5)

[Claims] 1. A bottom-blowing furnace having a bottom-blowing refractory in the hearth part, and gas-flow direction changing means for changing the flow direction of gas flowing through the bottom-blowing refractory to a side away from the furnace wall. A bottom-blown furnace characterized by that. 2. The gas flow direction changing means comprises a fixed refractory which is installed above and away from the bottom blowing refractory and changes the flow direction of the gas flowing out through the bottom blowing refractory. Bottom blowing furnace. 3. The gas flow direction changing means comprises a fixed refractory having a vent hole which is installed on the bottom blowing refractory and which changes the flow direction of the gas flowing through the bottom blowing refractory. Bottom blowing furnace described in. 4. The gas flow direction changing means comprises a permeable fixed refractory which is installed on the bottom blowing refractory and changes the flow direction of the gas flowing through the bottom blowing refractory. Bottom blowing furnace described in. 5. The gas flow direction changing means comprises a refractory material which is installed on the bottom blowing refractory material and in which is embedded a thin tube for changing the flow direction of the gas flowing through the bottom blowing refractory material.
Or the bottom blowing furnace according to 2.