JP2006200824A - Reverse inclination lining structure for furnace having contraction part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve stable operation by laying lining bricks of a contraction part of a furnace in a reverse inclination, and preventing cracking of the bricks. <P>SOLUTION: In the reverse inclination lining structure for the furnace having the contraction part structure, the lining bricks 7a are laid such that a width direction axis 14 of the lining brick 7a of the contraction part 7 is on a shell face 1a of the contraction part 7, it is in parallel with the shell face 1a from a furnace bottom 4 to a furnace throat 8, and it is positioned in an acute angle side 31 between a height direction axis 12 extending in a height direction, and a perpendicular axis 11 perpendicular to the shell face 1a of a body part 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reverse inclined lining structure of a furnace having a drawing structure such as a converter, an AOD furnace, a hot metal pretreatment furnace, a kneading wheel, and the like. And new improvements to achieve stable operation.

Generally, in a furnace having a throttle structure such as a converter, a horizontal stacking lining structure in which the lining bricks of the throttle part are stacked in parallel with the lining bricks that are lined perpendicularly to the direct barrel iron shell, or the lining bricks of the throttle part An inclined stacking lining structure is applied in which the center axis in the thickness direction is positioned on the obtuse angle side between the direction of the throttle part iron skin and the direction perpendicular to the straight body iron skin. In the horizontal stacking structure, the base of the throttle part, that is, the lining brick of the throttle part close to the straight body part may crack and fall off. This is because, in a furnace that has received hot metal or molten steel, the lining brick exposed to high temperature expands, causing a large push-up from the furnace bottom to the furnace opening, and the push-up concentrates on the lining brick in the throttle section. It is a factor. This shortens the life of the furnace. As one method for solving this, an inclined stacked lining structure has been devised in the throttle portion.
In relation to these structures, the following patent documents are disclosed.

First, Patent Documents 1 and 2 illustrate an inclined stacked structure and a horizontal stacked structure.
Further, Patent Document 3 exemplifies an inclined lining structure in which bricks are stacked perpendicularly to the throttle part skin surface.
Further, Patent Document 4 exemplifies a horizontally stacked lining structure.
Further, Patent Document 5 exemplifies a horizontal stacking lining structure, and is characterized in that stacking is performed so that the angle formed by the surface of the axis and the lining brick is smaller than the angle formed by the axis of the furnace and the drawn iron core. Patents are disclosed.
Further, the relationship of the AOD furnace can be the structure of Patent Document 6, and the relationship of the chaotic vehicle can be the structure of Patent Document 7.

Japanese Utility Model Publication No. 61-159357 JP 2003-231910 A Japanese Utility Model Publication No. 3-67050 JP-A-5-279719 JP-A-7-3321 JP-A-7-224316 JP-A-8-176634

  Since a conventional furnace having a throttle structure such as a converter is configured as described above, the following problems exist. In other words, compared to horizontal stacking, slanted stacking is effective in reducing stress, but bricks may fall off during building or may fall out during use. In addition, even if the furnace can be built as planned, many times during the operation of the furnace are always subjected to the downward force due to gravity to the inclined brick, especially at the end of operation when the brick is worn out and the thickness is shortened. Brick may fall out. Furthermore, according to the research by the inventors of the present invention, it was found that, in the first place, the stress that leads to the crack of the brick is reduced in the inclined stack, but a gap is easily generated between the bricks in the narrowed portion as compared with the horizontal stack.

  The reverse inclined lining structure of the furnace having the throttle structure according to the present invention is a furnace throttle part structure having a straight body part and a throttle part, wherein the central axis in the thickness direction of the lining brick to be constructed inside the throttle part is Between the vertical axis perpendicular to the core surface of the straight body portion and the vertical axis that is on the core surface of the section and that extends in the height direction along the core from the furnace bottom to the furnace port The lining bricks are stacked so as to be positioned on an acute angle side, and the thickness direction central axis is configured to form a reverse inclination angle of 5 to 30 degrees with respect to the vertical direction axis. The inner surface of the lining brick applied to the throttle portion has no step, and the furnace is any one of a converter, an AOD furnace, a kneading wheel, and a hot metal pretreatment furnace.

  Since the reversely inclined lining structure of the furnace having the throttle structure according to the present invention is configured as described above, the following effects can be obtained. In other words, it is easy to prevent the brick from shifting or falling out during the furnace building by making the stacking structure of the furnace lining brick, such as converters, AOD furnaces, hot metal pretreatment furnaces, kneading cars, etc. Since the furnace can be built, the effect of significantly shortening the construction time can be obtained, and the cracking of the brick can be prevented without causing stress concentration due to the expansion of the brick during use. Since there is no gap, stable operation is possible, and repair work that has been performed in the past against damage or falling off of bricks is not required, and the repair materials associated therewith are not required, and the furnace life is greatly improved. Can now get.

  The present invention is a lining that can be easily built without shifting or falling out of bricks during the construction of the furnace lining bricks by using a reverse inclined stacking structure, and stress concentration due to the expansion of bricks during use. The purpose of the present invention is to provide a reverse inclined lining structure for a furnace having a throttle structure in which a gap between the throttle parts is not generated during use. .

A preferred embodiment of a reverse tilt lining structure for a furnace having a throttle structure according to the present invention will be described below with reference to the drawings.
Usually, brick construction of the furnace 20 is performed from the bottom 20a of the furnace 20 upward. An example will be described with reference to FIG. In FIG. 1, a perma lining 2 and a wear lining 3 are constructed inside the iron skin 1. This permal lining 2 may be a brick that is a regular refractory, or a castable, a stamp material, a filler, or the like that is an irregular refractory. On the other hand, the wear lining 3 is a brick having a predetermined shape. The perma lining 2 and the wear lining 3 are constructed from the furnace bottom 4 with the furnace 20 standing as shown in FIG. 1, and the furnace bottom 4, the lower corner part 5, and the straight body part 6 in order from the bottom to the top. To be constructed. When the straight body portion 6 is constructed, the throttle portion 7 is constructed. Here, the brick 7a of the wear lining 3 of the throttle portion 7 is constructed by the reverse inclined product lining according to the present invention, and the top is the furnace port 8.

  Since the wear lining 3 of the straight body portion 6 is a horizontal product, it is not possible to construct the reverse inclined brick of the throttle portion 7 immediately above it. Therefore, a lower raised brick 9 is used at the lower portion of the throttle portion 7. This lower raised brick 9 is a brick that bridges the reverse slope product and the horizontal product. As shown in FIG. 2, one or more bricks are used to change the reverse slope angle while changing the angle from the horizontal product. Yes. Moreover, the brick which is piled up to the upper part of the throttle part 7 by this reverse inclination product, is returned to the horizontal level again at the furnace port 8, and comes into contact with the iron shell 1 of the furnace port 8 is the upper raised brick 10. Although FIG. 1 shows an example in which the upper one is 10 in the last one, a plurality may be used.

  As shown in FIG. 2, the inner brick 7a of the wear lining 3 having the reverse inclined product of the throttle portion 7 may be smoothly stacked on both the furnace inner surface 7aA (working surface) and the rear surface 7aB. As shown in FIG. However, since the protruding part of the step is easily broken during use, the construction shown in FIG. 2 in which there is no step on the furnace inner surface 7aA of the lining brick 7a applied to the throttle portion 7 is more preferable.

The reverse inclination angle in the reverse inclination lining by the lining bricks 7a formed in the throttle portion 7 is determined as follows. 8 and FIG. 9, a vertical axis 11 directed to the furnace inner surface 7 a </ b> A perpendicularly to the core 1 of the straight body portion 6 in FIG. 8 and FIG. 9, and a height axis 12 directed in the height direction along the core 1 of the throttle portion 7. The manner in which the acute side 13 of the angle formed by the inner brick 14a in the thickness direction of the lining brick 7a disposed in the throttle portion 7 passes is the inversely inclined product. In addition, the construction in which the thickness direction central axis 14 of the lining brick 7a passes through the obtuse angle side 15 in FIG. 9 is an inclined product. In addition, as for the reverse inclination angle 16 which is an angle formed by the thickness direction central axis 14 and the vertical direction axis 11 of the brick 7a in FIG. 9, the effect is exhibited at an arbitrary angle if it is reverse inclination, but preferably 5 to 30 degrees. Is the best time. If the angle is less than 5 degrees, the effect of suppressing cracking of the lining brick 7a and the generation of a gap between the lining bricks 7a, which is the object of the present invention, is reduced, and the lining brick is likely to fall off 7a. However, even if the angle exceeds 30 degrees, for example, dowels (not shown) may be provided on both the upper and lower surfaces or one side of the lining brick 7a to prevent the lining brick 7a from falling off during operation.
In addition, the construction method of this invention can exhibit an effect by using for the converter, AOD furnace, kneading vehicle, hot metal pretreatment furnace, etc. which have a throttle part structure.

  Next, Table 1 shows the results of experiments using a plurality of types of furnaces to which the inversely inclined lining structure of the furnace having the throttle structure according to the present invention is applied.

The construction time ratio of the throttle part in Table 1 is the construction time including the preparation in the throttle part when the inclined product construction is carried out as a comparative example in the same furnace as the present invention, including the preparation in the same part of the present invention. This is the ratio when the construction time is removed. When the ratio is 100, the smaller the numerical value, the same as the comparative example, indicating that the construction time is shorter and better.
The degree of crack crack damage in Table 1 is the damage rate (mm / ch) due to crack damage of the throttle brick when a tilted product is constructed as a comparative example in the same furnace as the present invention. It is a degree display when dividing the crack damage rate of the squeezed brick. When the degree is 100, it is the same as the comparative example, and the smaller the numerical value, the smaller the crack damage rate and the better.
Also, the degree of squeezing part bricks is the number of squeezing part bricks over one furnace when the inclined product construction is carried out as a comparative example in the same furnace as the present invention. It is a degree display when the number is divided. When the degree is 100, it is the same as the comparative example, and the smaller the numerical value, the smaller the crack damage rate and the better.
Therefore, as can be seen from Table 1, all the examples of the present invention are superior to the comparative examples.

The inversely inclined lining structure of the furnace having the throttle structure according to the present invention can be applied to all other furnaces using a lining brick.
10 is a cross-sectional view showing a structure in which the present invention is applied to the lining of the chaotic vehicle 30. The same parts as those in FIG.

It is sectional drawing of the principal part which shows the reverse inclination lining structure of the furnace which has a throttle part structure by this invention. It is an expanded sectional view of the principal part of FIG. It is sectional drawing which shows the other form of FIG. It is sectional drawing which shows the other form of FIG. It is sectional drawing which shows the other form of FIG. It is an expanded sectional view which shows the raising of FIG. It is sectional drawing which shows the other form of FIG. It is a whole block diagram which shows how to determine the reverse inclination angle of the reverse inclination product of the principal part of FIG. It is an enlarged view of the principal part of FIG. It is sectional drawing which shows the structure of the chaotic vehicle to which the structure of FIG. 1 is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron skin 2 Perm lining 3 Wear lining 4 Furnace bottom 5 Lower corner part 6 Straight trunk part 7 Constriction part 8 Furnace port 9 Lower raising part 10 Upper raising part 11 Vertical axis 12 Height direction axis 13 Acute angle side 14 Thickness Direction center axis 15 Obtuse angle side 16 Reverse inclination angle 20 Furnace 30 Chaos

Claims (4)

  In the throttle part structure of the furnace (20) having the straight body part (6) and the throttle part (7), the thickness direction central axis (14) of the lining brick (7a) to be constructed inside the throttle part (7), A height direction axis (12) on the iron skin surface (1a) of the throttle part (7) and from the furnace bottom (4) toward the furnace port (8) and along the iron skin (1) in the height direction. ) And the straight brick portion (6) from the configuration in which the lining brick (7a) is stacked so as to be positioned on the acute angle side (13) between the vertical axis (11) perpendicular to the iron skin surface (1a) of the straight body portion (6). A reverse inclined lining structure for a furnace having a throttle structure.   The furnace having a throttle structure according to claim 1, wherein the central axis (14) in the thickness direction forms an inverse inclination angle (16) of 5 to 30 degrees with respect to the vertical axis (11). Reverse tilt lining structure.   The reverse inclined lining structure for a furnace having a throttle structure according to claim 1 or 2, wherein there is no step on the furnace inner surface (7aA) of the lining brick (7a) applied to the throttle section (7).   4. The reverse tilt of the furnace having the throttle structure according to claim 1, wherein the furnace (20) is any one of a converter, an AOD furnace, a kneading wheel, and a hot metal pretreatment furnace. Lining structure.

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