JPH0942855A - Checker brick of hot-blast stove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a breaking load in the orthogonal direction to the lateral side larger than the one of an ordinary checker brick of a hot-blast stove by a method wherein the ratio in a bore between the central hole and adjacent holes of a hexagonal- pillar-shaped body so stacked that a large number of gas passages communicate with each other is set to be in a specific range. SOLUTION: A checker brick 22 has a brick main body 23 formed in the shape of a hexagonal pillar. A gas passage hole A11 is formed in the center of this brick main body 23 and six gas passages B11-B16 on the concentric circle and at prescribed angles from the center so that they pierce the main body vertically, and thereby the gas passages totaling seven are prepared. Besides, gas passages each having the shape of a 1/3 circle of the hole A11 are formed at the apexes of the hexagon of the main body 23 and ones each having the shape of a 1/2 circle of the hole B11 at the centers of the sides of the hexagon respectively so that they pierce the main body vertically, and thereby the gas passages totaling twelve are prepared. The ratio in a bore between the gas passage hole A11 and the gas passage holes B11-B16 is set to be in a range of 1.4 to 2.1. According to this constitution, a breaking load in the orthogonal direction to the lateral side can be made larger than the one of an ordinary checker brick of a hot-blast stove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-blast stove checker brick, and more particularly to a hot-blast stove checker brick characterized by a checker brick shape portion for storing heat in a hot-blast stove that produces hot air to be sent to a blast furnace.

[0002]

2. Description of the Related Art A hot blast stove for a blast furnace has two types of structures, an external combustion type and an internal combustion type, and heats and heats air to 1000 ° C. to 140 ° C.
It is being blown into the blast furnace as hot air at 0 ° C. This hot blast stove is provided with a combustion chamber and a heat storage chamber in order to maintain temperature uniformity and flow rate stability, and usually three to four hot blast stoves are installed for one blast furnace. In a hot-blast stove, the combustion gas is burned in the combustion chamber to guide it to the heat storage chamber, and the heat of combustion is stored in the bricks in the heat storage chamber. The hot air is blown to the blast furnace cyclically and repeatedly.

In order to store heat efficiently in the heat storage chamber of such a hot-blast stove, a large number of holes, which are called, for example, checker bricks and which are formed in the shape of a hexagonal column and vertically penetrate, are used as gas passages. The projections are formed so as to project on the upper surface of the predetermined gas flow path, and the recesses corresponding to the lower surface are formed.

The shape of the conventional checker brick is disclosed in Japanese Utility Model Laid-Open No. 5-77242, which is diverted in FIG. This is an external perspective view of a typical example of a checker brick that has been generally implemented in the past. In the figure, the checker bricks 3 and the checker bricks 1 and 2 are overlapped so that the diagonal gas flow passages of the checker bricks 3 and the checker bricks 1 and 2 communicate with each other, and 1/3 of the horizontal cross section overlaps each other. The checkered bricks around it are also built. At this time, for example, the hole diameters of the gas passages 4 to 10 of the checker brick 2 are generally all the same in order to communicate with each other.

[0005]

FIG. 4 is a horizontal sectional view of a typical example of a conventional checker brick. The center position A1 of the gas flow path at the center of the checker brick 11 is located at the intersection of the diagonal lines of the hexagons, and the adjacent gas flow paths are diagonally connected to the central gas flow path A1 in order to connect the gas flow paths of the upper and lower bricks. It is on the line connecting the and. At this time, the centers of the adjacent gas flow paths are located at half the distance between the central gas flow path and the diagonal,
For example, the center of B1 is located in the middle of the gas flow paths A1A and A2. The distance A1-B1 and the distance B1-A2 are the same, and the hole diameters are also the same. Therefore, side surface A2-A
7 and A4-A5 breaking load when a load is applied at right angles,
When comparing the left horizontal load on the A2-A3-A4 surface and the right horizontal load on the A5-A6-A7 surface and the diagonal breaking load, the breaking load when a load is applied at right angles to the side surfaces Is
It becomes about 1/4 of the breaking load in the diagonal direction.

Of the hot-blast stoves, the external combustion type heat storage furnace has a perfect circular structure, and the stress due to the expansion of the main brick is applied to the outside, so that the checker brick inside is not easily affected. FIG. 5 shows a typical example of an internal combustion type hot blast stove. Since the heat storage chamber and the combustion chamber are separated by a partition wall, the horizontal section has a crescent shape and is easily affected by stress. In this drawing, 13 is a heat storage chamber and 14 is a combustion chamber in the hot stove 12. There is a brick wall as the partition wall 15 between the heat storage chamber 13 and the combustion chamber 14. In this structure, the checker brick is perpendicular to the chords of the partition wall, for example, the diagonal line of the checker brick 11 in FIG. 4, for example, the diagonal line A3-A6. Is built like this. Therefore, in the vicinity of the central portion in the width direction of the partition wall, the load due to the expansion of the partition wall is applied diagonally to the checker brick, and the damage to the checker brick was small.
However, in the vicinity of both ends of the partition wall, the angle of the partition wall changes, and the load due to thermal expansion is applied at a right angle to the side surface of the checker brick, for example, from a direction perpendicular to the A2-A7 surface and the A4-A5 surface, as shown in FIG. There was a problem that the checker bricks 16 and 17 at the corners were broken and the checker bricks had to be replaced and repaired.

Therefore, in the present invention, the breaking load in the direction perpendicular to the side surface is higher than that of the conventional hot stove checker brick, and the breaking load shows substantially the same value in the diagonal direction and the direction perpendicular to the side surface. The purpose is to provide checker bricks.

[0008]

The above-mentioned object is to provide a hot-air stove having seven hexagonal column-shaped holes which are formed so that a large number of gas flow passages are formed and which are connected to communicate with each other. The checker brick is achieved by a hot-blast stove checker brick characterized in that the ratio of the central hole diameter / adjacent hole diameter is in the range of 1.4 to 2.1.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

In a checker brick of a hot-blast stove having seven hexagonal prism-shaped holes formed so that a large number of gas flow passages are formed so that the gas flow passages communicate with each other, the direction of the load applied to the checker bricks is A physical test and FEM analysis were performed on the breaking load of the brick. As a result, it was confirmed that the breaking load in the direction perpendicular to the side surface was about 1/4 of the breaking load in the diagonal direction. Fig. 6 shows a horizontal cross-sectional view when a load is applied to the checker brick, and the side surface A2
When a load is applied at a right angle to the -A7 surface and the A4-A5 surface, cracks 19 occur on the line connecting the gas flow path holes B13-B14. In addition, the left horizontal load is applied to the A2-A3-A4 surface by A5.
When a right horizontal load is applied to the -A6-A7 surface, a crack 21 occurs on the line connecting the gas flow path hole B15 and the hole B16.
Based on this shape, the value obtained by adding the side area and the surface area of the gas flow passage hole is made constant, the gas flow passage holes A1 to A7 are made large, and the gas flow passage holes B1 to B12 are made small and the gas flow passage hole A1.
The fracture load when a load is applied diagonally and at a right angle to the side face when A7 is small and gas passage holes B1 to B12 are large was calculated by FEM. FIG. 1 shows the calculation results of the breaking load when the ratio of the hole diameters of the gas flow path is changed. When the gas passage holes A1 to A7 shown in FIG. 6 are made large and the gas passage holes B1 to B12 are made small, the diagonal breaking load decreases and the breaking load perpendicular to the side surface increases as the hole diameter ratio increases. Therefore, there is a point where the load perpendicular to the diagonal and the side surface become equal, and the breaking load perpendicular to the side surface at that point is 1.5 times that of the conventional one, making it difficult for the brick to break. From this,
In the present invention, the ratio of the hole diameter of the gas passage hole A1 (hole diameter at the center) / the hole diameter of the gas passage hole B1 (adjacent hole diameter) is 1.4 to
The range of 2.1 is preferable, and 1.7-1.
It is preferably in the range of 9. When the ratio of the hole diameters of the gas flow path is less than 1.4 and exceeds 2.1, one of the breaking load perpendicular to the diagonal and the side surface is 1.2 compared with the conventional breaking load perpendicular to the side surface. It becomes less than double and the effect becomes smaller. Further, if the ratio of the hole diameters of the gas flow paths is less than 1, the breaking load becomes smaller than that of the conventional one, which is not preferable.

As a measure for preventing horizontal deviation of the checker brick from flat bricks and horizontal bricks, a convex shape is formed so as to protrude above the upper surface of the gas flow path, and a concave shape corresponding to the lower surface is formed in the gas flow path shape. The present invention is applicable. The material of the checker brick is generally silica, alumina, or clay, but the application of the present invention does not limit the material. There are chimney stacking and lap stacking as building methods, but either building method is applicable and is not specified.

According to the present invention, it is possible to prevent the checker brick from being destroyed by the expansion stress of the partition wall, and the repair work of the hot stove can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a horizontal sectional view according to an embodiment of the checker brick of the present invention.

The checker brick 22 of the hot-blast stove has a brick main body 23 formed in the shape of, for example, a hexagonal prism, similar to the checker brick already described, and the brick main body 23 has a gas passage hole A11 at the center thereof. And six gas passage holes B11 to B16 concentrically at a constant angle from the center.
Are formed so as to penetrate vertically to form a total of seven gas flow paths, and the hexagonal apex of the main body 22 has a 1/3 circular shape of the hole A11 or a 1/2 circular shape of the hole B11 at the center of each side. Gas passage holes are formed so as to penetrate vertically to form a total of 12 gas passages. As an example of the size of this checker brick, the diagonal distance between the vertices is 220 mm, and the conventional uniform hole diameter is 3 mm.
Assuming that the hole A11 has a hole diameter of 50 mm and the hole B11 has a hole diameter of 31.3 mm with respect to 6 mm, side surfaces A12-A17 and A
14-A Breaking load and A when a load is applied perpendicular to the 15 plane
12-A13-A14 side left horizontal load A15-A16
The breaking load when a right horizontal load was applied to the −A17 surface was the same value, and the breaking load when a load was applied perpendicularly to the side surface was 1.5 times that of the conventional one.

[0015]

With the checker brick for a hot stove according to the present invention, the breaking load of the checker brick has the same value in both the diagonal direction and the direction perpendicular to the side surface, so that the collapse of the brick in the corner of the partition wall of the heat storage chamber is reduced. As a result, the reduction in thermal efficiency due to the collapse of checker bricks is reduced, and the economic effect is obtained.

[Brief description of drawings]

FIG. 1 is a calculation result of a breaking load when a ratio of hole diameters of a gas passage according to the present invention is changed.

FIG. 2 is a horizontal sectional view of a checker brick according to the present invention.

FIG. 3 is an external perspective view of a typical example of a hot stove checker brick.

FIG. 4 is a horizontal cross section of a typical example of a hot stove checker brick.

FIG. 5 is a horizontal sectional view of a typical example of an internal combustion hot stove.

FIG. 6 is a horizontal sectional view when a load is applied to the hot stove checker brick.

[Explanation of symbols]

1-3, 11, 22 ... Checker bricks, 4-10 ... Gas flow passages, 12 ... Internal combustion hot stoves, 13 ... Heat storage chambers, 14 ... Combustion chambers, 15 ... Partition walls, 16, 17 ... Checker bricks at corners , 18 ... A direction in which a load is applied at right angles to the side surfaces A2-A7, 19, 21 ... Cracks, 20 ... Diagonal direction in which a left horizontal load is applied to the A2-A3-A4 surface, 23 ... Checker brick main body.

Claims (1)

[Claims] 1. A checker brick for a hot-blast stove having seven hexagonal column-shaped holes, which are stacked so that a large number of gas channels are formed and these gas channels are connected to each other,
The hot-blast stove checker brick is characterized in that the ratio of the central hole diameter / adjacent hole diameter is in the range of 1.4 to 2.1.