JPH077316Y2 - Brick pile structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a converter brick-laying structure, and in particular, by enlarging the brick cross-sectional shape of the charging pad (charge side) that is easily damaged when scrap is input. The present invention relates to a converter brick-laying structure with improved durability and extended life.

[Prior Art] Conventionally, the brick-laying structure of a converter has been studied including the brick shape and construction, and the bottom of the furnace is net-pitch stacking, true-circular stacking, parallel stacking, and a combination thereof, and the furnace wall is Single layer stacking with long bricks, integrated stacking with doweled bricks, fusion integrated stacking with iron plate bricks, tensile stacking with tension metal fittings on the outside of the furnace, or furnace with the outside of the furnace adjusted by stamping material Various brick-laying structures such as obtuse corner stacking with a larger and smoother corner angle on the inner surface side have been studied.
Further, a number of brick-laying methods have been devised and adopted depending on the location inside the furnace in order to balance the damage, such as adjusting the lining thickness of the lining bricks, applying so-called "zoned lining". In terms of material, MgO-
C bricks dominate the mainstream.

By the way, the damage mechanism of the lining bricks constituting the converter is extremely complicated, and the damage rate is significantly different depending on the inside of the furnace. In particular, when the converter is tilted to the side of the unextruded steel and scrap, hot metal, etc. are charged into the furnace, the charging pad part on the charging side that directly hits the lining brick is impacted by the scrap etc. Is very easily damaged.

Therefore, conventionally, as shown in the longitudinal sectional view in FIG. 4, the lining bricks 11 arranged in the charging pad portion 11 are arranged.
For a, use a super-long-sized brick that has a lengthwise length that is 150 to 250 m / m longer than the lining brick 12a arranged on the tapping side 12, and uses a material with high strength. It was applied and dealt with.

[Problems to be Solved by the Invention] However, even with such a structure, the impact force at the time of scrap input is large, and the brick is destroyed by the occurrence of cracks, cracks, or the like. Therefore, the damage is severe, and it is extremely difficult to balance the damage with other parts. In addition, in the conventional press machine, it is difficult to maintain corrosion resistance and spalling resistance as well as high strength due to the absolute lack of molding pressure during brick manufacturing, and it is difficult to make the length longer It was almost impossible to make bricks.

For this reason, a more fundamental and intensive reinforcement measure is desired in the brick-laying structure of the charging pad portion that constitutes the converter.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above conventional problems and to provide a converter brick-laying structure for improving the durability of a charging pad portion forming a converter and extending the life of the converter.

[Means for Solving the Problems] In the brick laying structure of the converter of the present invention, in the brick laying structure that constitutes the converter, the stacking height dimension and the height of the lining bricks arranged in the charging pad portion at the time of construction It is characterized in that the cross-sectional area in the direction is made larger than the stacking height dimension at the time of construction of the lining brick arranged on the tapped side and the cross-sectional area in the height direction.

[Operation] In the present invention, in the brick-laying structure of the charging pad that constitutes the converter, the building height of the lining brick at the time of construction is larger than that of the steel-lined lining brick, and the cross-sectional area is also larger. It is as a structure. Therefore, even if the same material is applied, the strength of each lining brick in the charging pad portion is greater than the strength of each lining brick on the tapping side. Therefore, it is possible to withstand the impact when scrap is thrown in, suppress the occurrence of cracks, cracks, etc., and prevent the progress of destruction, which in turn greatly extends the life of the entire converter. it can.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a vertical sectional view of a converter brick-laying structure according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a front view showing the brick-laying structure. is there. In the figure, 10 is a converter,
5 is a trunnion, 6 is a tap hole, and 7 is an input port.

As shown in the figure, in the converter brick-laying structure of the embodiment, in the brick-laying structure of the charging pad portion 1 forming the converter 10, the building height dimension h ₁ of the lining brick 1a at the time of building is lined on the tapping side 2. The brick 2a is made thicker than the dimension h ₂ and has a large cross-sectional shape.

By thus increasing the cross-sectional area of the lining brick 1a of the charging pad portion 1, the strength per brick increases. Therefore, when the converter 10 is tilted to the opposite steel side and scrap or the like is thrown in, even if a shock due to the drop of the scrap or the like is received, it can be absorbed and absorbed to withstand the impact force, and cracks, cracks, etc. It is possible to suppress the occurrence of such as and prevent the progress of destruction. This can significantly extend the life of the converter.

The charging pad unit construction at the product height h ₁ of the lining bricks 1a of 1, the size of the converter, the shape of the lining bricks used, is affected by the brick quality or damage balance and the like, is applied, unconditionally limited You cannot do it. Normally, the lining bricks used for the furnace belly are divided into multiple pieces in the circumferential direction, and the lining thickness on the charging side, that is, the charging pad 1 side, the trunnion side 3, and the tapped side 2 is used to balance the damage. Or the same lining thickness for the entire circumference is used for each stage, and the stacking height dimensions during construction are arranged. Therefore, if the stacking height dimension at the time of building is changed depending on the direction, the construction at the time of building becomes difficult. Therefore, for example, the building height dimension h 2 of the lining brick 2a on the tapped side ₂ or the structural loading height dimension h ₃ of the lining brick 3a on the trunnion side ₃
On the basis of, the tapping side 2 or the trunnion side 3 is a brick 2 step, the charging pad part 1 is a brick 1 step (Fig. 3 (a)), and the tapping side 2 or a trunnion side 3 is a brick 3 step. On the other hand, the charging pad portion 1 has two bricks (FIG. 3 (b)), the tapping side 2 or the trunnion side 3 has four bricks, whereas the charging pad portion 1 has three bricks (FIG. 3 (c)). )), It is preferable to set the brick 1a of the charging pad 1 so that the bricks on the tapping side 2 or the trunnion side 3 are at the same level every 2 to 4 steps.

Here, the reason why the bricks of the charging pad portion 1 are set to the same level for every 2 to 4 brick steps on the tapping side 2 or the trunnion side 3 is as follows. That is, conventionally, the lining brick used for the furnace belly has a stacking height dimension at the time of construction of about 150 m / m, and the charging pad 1 has 15 to 15 m / m.
This is because about 20 are arranged. In the present invention, when the dimension h 1 of the brick 1a of the charging pad ₁ is thickened at a small rate, it is difficult to make an adjustment with the lining bricks 2a and 3a on the tapped side 2 and the trunnion side 3 or to adjust the level. In addition to that, the rate of increase in the cross-sectional shape also decreases, and sufficient strength cannot be achieved. On the other hand, if h ₁ is too large, the forming pressure in the brick production is absolutely insufficient, and the specified strength cannot be obtained together with the corrosion resistance and the spalling resistance. Therefore, when considering the brick workability and considering the brick size that can be manufactured by a press with a molding pressure of 5000T class, which has been applied in recent years, the tapping side 2 or trunnion side 3
It is preferable that the charging pad section 1 is bricked so that the same level is obtained for every 2 to 4 bricks.

In the present invention, the lining brick 1a used for the charging pad part 1 not only has a thicker building height dimension h ₁ at the time of building to increase the cross-sectional area but also the number of divisions in the circumferential direction of the converter. In order to improve the strength, it is desirable that the width w is increased so that the width becomes smaller, and preferably w = h _{1 so that the} cross-sectional shape is as close to a square shape as possible. The same applies to the tapped side 2 and the trunnion side 3. Also,
The lining bricks 1a of the charging bat 1 are arranged so as to be half-shifted in the circumferential direction of the converter for each stage, for example, as shown in FIG. 3 (a).
As shown in (c), the lining bricks 1a of the charging pad 1 and the lining bricks 3a of the trunnion side 3 are adjusted in the circumferential direction of the converter by adjusting bricks 1b and 3b to adjust the joints in the vertical direction as much as possible. It is preferable to make the arrangement so that 4 does not form a joint. The same applies to the tapped side 2 and the trunnion side 3.

In the present invention, the building height dimension h ₁ of the lining brick 1a of the charging pad 1 (the same applies to the bricks 2a and 3a) and the circumferential dimension w are set to be substantially the same as possible. Making the cross-sectional shape square is not a limiting requirement at all, and the circumferential dimension w can be made larger than the building height height dimension h ₁ or can be made smaller to make the cross-sectional shape a rectangle close to a square. You can also Also, instead of adjusting bricks 1b and 3b used in the arranging section in the shape of a half-cell, adjust the circumferential dimension so that it becomes a 2 / 3-cell or 3 / 4-cell shape, or change the number of steps used up and down. However, the present invention is not limited to the illustrated embodiment.

[Advantages of the Invention] As described in detail above, according to the converter brick-laying structure of the present invention, the strength of each charging butt portion of the converter which constitutes the lining brick increases, so that the impact at the time of scrap loading is increased. It is possible to sufficiently withstand even this, it is possible to prevent the occurrence of cracks, fractures, etc., and prevent the progress of destruction. Therefore, damage balance of the converter can be achieved, and the life of the entire converter can be significantly extended.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a converter brick-laying structure of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a front view showing the brick-laying structure. FIG. 4 is a vertical sectional view showing a conventional example. 1 …… Charging butt part, 1a, 2a, 3a …… Inner brick, 2 …… Steel side, 3 …… Trunnion side, 10 …… Converter.

Claims (1)

[Scope of utility model registration request] 1. In a brick-laying structure constituting a converter, an inner-lining brick having a stacking height dimension at the time of construction of an inner-lining brick arranged in a charging butt portion and a cross-sectional area in the height direction is arranged on a tapped steel side. The building height of the converter at the time of construction and the cross-sectional area in the height direction are larger than those of the converter bricks.