WO2006077786A1

WO2006077786A1 - Reverse slant lining structure of furnace with reduced part structure

Info

Publication number: WO2006077786A1
Application number: PCT/JP2006/300425
Authority: WO
Inventors: Shigeki Uchida; Minoru Suto
Original assignee: Shinagawa Refractories Co., Ltd.
Priority date: 2005-01-20
Filing date: 2006-01-16
Publication date: 2006-07-27
Also published as: TW200641316A; EP1852666A1; KR101223869B1; EP1852666A4; KR20070099650A; AU2006207148A1; JP2006200824A; EP1852666B1; AU2006207148B2; TWI351506B; JP4469731B2

Abstract

A reverse slant lining structure of a furnace with a reduced part structure capable of achieving stable operation by laying lining bricks at the reduced part of the furnace by a reverse slant method to prevent the bricks from cracking. The structure is formed by laying the lining bricks (7a) so that the center axis (14) of the lining bricks (7a) at the reduced part (7) in the thickness direction is positioned on the iron skin (1a) of the reduced part (7) on an acute angle side (13) between a vertical axis (12) vertically extending from a furnace bottom (4) to a throat (8) along the iron skin (1) and a perpendicular axis (11) perpendicular to the iron skin (1a) of a straight body section (6).

Description

Specification

Reverse tilt lining structure of furnace with throttle structure

Technical field

[0001] 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 vehicle, and the like. The present invention relates to new improvements to prevent brick cracking and achieve stable operation.

Background art

[0002] Generally, in a furnace having a constricted portion structure such as a converter, a horizontally stacked lining structure in which the lining bricks of the constricted portions are stacked in parallel with the lining bricks that are lined perpendicularly to the core barrel core, or A central axial force in the direction of the thickness of the lining brick in the throttle part. In a horizontally stacked structure, the base of the throttle, that is, the lining brick of the throttle close to the straight barrel, 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 temperatures 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. Is a factor. This shortens the life of the furnace. As one method for solving this problem, an inclined stacking lining structure has been devised in the throttle part.

In relation to these structures, the following patent documents are disclosed.

[0003] First, Patent Documents 1 and 2 illustrate an inclined stacking structure and a horizontal stacking structure.

Further, Patent Document 3 exemplifies an inclined lining structure in which bricks are stacked perpendicularly to the iron surface of the throttle part.

Patent Document 4 exemplifies a horizontally stacked lining structure.

Further, Patent Document 5 exemplifies a horizontal stacking lining structure, in which stacking is performed so that the angle formed between the axis and the lining brick is smaller than the angle formed between the furnace axis and the drawn iron core. A featured patent is disclosed.

Furthermore, the structure of Patent Document 6 can be related to the AOD furnace, and the structure of Patent Document 7 can be related to the chaotic vehicle. [0004] Patent Document 1: Japanese Utility Model Publication No. 61-159357

Patent Document 2: Japanese Patent Laid-Open No. 2003-231910

Patent Document 3: Japanese Utility Model Publication No. 3-67050

Patent Document 4: JP-A-5-279719

Patent Document 5: Japanese Patent Laid-Open No. 7-3321

Patent Document 6: Japanese Patent Laid-Open No. 7-224316

Patent Document 7: JP-A-8-176634

Disclosure of the invention

Problems to be solved by the invention

[0005] 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 reduces stress, and bricks may fall off during use in a force-building furnace, and bricks may be pulled out during use. Even if the furnace can be built as planned, many times during the operation of the furnace, the slanted brick is always subjected to the force of dropping downward due to gravity. At the end, bricks may fall out. Furthermore, according to the research by the inventors of the present invention, it was found that in the first place, the slanted stacking reduces the stress associated with the cracks in the bricks, and it is easier to create a gap between the bricks in the throttle than in the horizontal stacking. Means for solving the problem

[0006] The reverse inclined lining structure of the furnace having the throttle structure according to the present invention is the central axis of the brick in the thickness direction of the inner brick to be constructed inside the throttle section in the throttle structure of the furnace having the straight body portion and the throttle portion. Force A force axis on the iron skin surface of the throttle part and facing the furnace bottom toward the furnace mouth, and a vertical axis perpendicular to the iron skin surface of the straight body part. The lining bricks are stacked so as to be positioned on the acute angle side between and the thickness direction central axis forms a reverse inclination angle of 5 to 30 degrees with respect to the vertical direction axis. In addition, there is no step on the furnace inner surface of the lining brick constructed in the throttle part, and the furnace is any one of a converter, an AOD furnace, a kneading car, and a hot metal pretreatment furnace. is there. The invention's effect

[0007] Since the inversely 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, by making the stacking structure of the furnace lining bricks, such as converters, AOD furnaces, hot metal pretreatment furnaces, kneading vehicles, etc. Since the furnace can be used, the effect of significantly shortening the construction time can be obtained.Breaking of the brick is prevented without stress concentration due to expansion of the brick during use. Since there is no gap, stable operation is possible, and repair work that has been carried out in the past for damage or falling off of bricks and the need for repair materials are significantly improved. Can now get.

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a main part showing a reverse inclined lining structure of a furnace having a throttle structure according to the present invention.

2 is an enlarged cross-sectional view of the main part of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of FIG.

FIG. 4 is a cross-sectional view showing another embodiment of FIG.

FIG. 5 is a cross-sectional view showing another embodiment of FIG.

FIG. 6 is an enlarged cross-sectional view showing the raised brick of FIG.

FIG. 7 is a cross-sectional view showing another embodiment of FIG.

8 is an overall configuration diagram showing how to determine the reverse inclination angle of the reverse inclination product of the main part of FIG.

FIG. 9 is an enlarged view of the main part of FIG.

FIG. 10 is a cross-sectional view showing the structure of a chaotic vehicle to which the structure of FIG. 1 is applied.

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] The present invention provides a lining that can be easily constructed without shifting or dropping off the bricks in the furnace construction by using a reverse-tilt stacking structure for the lining bricks of the furnace. Inclined lining structure for furnaces that has a constricted section structure that prevents cracking of bricks without causing stress concentration due to expansion, and in which no gaps form between the constricted section bricks during use. The purpose is to obtain. Example

Hereinafter, preferred embodiments of a reverse tilt lining structure for a furnace having a throttle structure according to the present invention will be described with reference to the drawings.

Normally, brick building of the furnace 20 is performed from the bottom 20a of the furnace 20 upward. As an example, this will be explained using FIG. In Fig. 1, the perm lining 2 and the wafer lining 3 are installed inside the iron skin 1. This perma lining 2 may be a fixed refractory, or an irregular refractory, such as a castable, stamp material, or filler. On the other hand, the wear lining 3 is a brick having a predetermined shape. These permanent lining 2 and 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 are installed in this order. It is constructed on the top. When this straight barrel part 6 is constructed, the throttle part 7 is constructed. Here, the brick 7a of the wear lining 3 of the throttle section 7 is constructed by the reverse inclined product lining according to the present invention, and further, the furnace die 8 is formed thereon.

[0011] Since the wear lining 3 of the straight body portion 6 is a horizontal product, a reverse inclined brick of the throttle portion 7 cannot be constructed immediately above it. Therefore, the lower part 9 is used at the bottom of the throttle part 7. This bottom raised brick 9 is a brick that bridges the reverse slope product and the horizontal product, using one or more as shown in Fig. 2, and changing the angle from the horizontal product to the reverse slope angle. ing. In addition, the brick that is piled up to the upper part of the throttle section 7 with this reverse inclined product, returned to the horizontal again in the furnace 8 and touches the iron skin 1 of the furnace 8 is the upper brick 10. Figure 1 may use multiple forces, which is an example where the last one has an upper base of 10.

[0012] As shown in Fig. 2, the inner brick 7a of the wear lining 3 that has the inversely inclined product of the throttle 7 can be smoothly stacked on both the furnace inner surface 7aA (working surface) and the rear surface 7aB. Can be stacked with steps as shown in FIGS. However, since the projecting portion of the step is easily broken during use, it is desirable that the construction shown in FIG. 2 in which the inner surface 7aA of the inner brick 7aA applied to the throttle 7 has no step is better.

[0013] The reverse inclination angle in the reverse inclination lining by the lining bricks 7a formed in the throttle portion 7 is determined as follows. In the furnace perpendicular to the core 1 of the straight body 6 in Figs. 8 and 9 The acute angle side 13 of the angle formed by the vertical axis 11 directed toward the surface 7aA and the height direction axis 12 directed in the height direction along the iron skin 1 of the throttle 7 is defined as the throttle 7 The arrangement of the lining bricks 7a through which the central axis 14 in the thickness direction passes is the inversely inclined product. It should be noted that the construction in which the central axis 14 in the thickness direction of the inner brick 7a passes through the obtuse angle side 15 in FIG. 9 is an inclined product. In addition, the reverse tilt angle 16 that is the angle between the thickness direction central axis 14 and the vertical axis 11 of the brick 7a in FIG. 9 is effective at any angle if it is reverse tilt, but preferably 5-30. The degree is optimal. If the angle is less than 5 degrees, the effect of the present invention is that the lining brick 7a is cracked and the lining brick is less effective in suppressing the gap formation between 7a, 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 of the lining brick 7a to prevent the lining brick 7a from falling off during operation.

The construction method of the present invention can be effective when used in a converter having a throttle structure, an AOD furnace, a kneading vehicle, a hot metal pretreatment furnace, and the like.

[0014] Next, Table 1 shows the results of experiments using a plurality of types of furnaces to which the reverse inclined lining structure of the furnace having the throttle structure according to the present invention is applied.

[0015] [Table 1]

Table 1

[0016] 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 was performed as a comparative example in the same furnace as the present invention. It is the ratio when the construction time including preparations is divided. When the ratio is 100, the smaller the numerical value, as in the comparative example, indicates that the construction time is shorter and better.

The degree of damage caused by cracking in the drawn part bricks in Table 1 is the damage rate (mmZch) caused by cracking damage in the drawn part bricks when the inclined product was installed as a comparative example in the same furnace as the present invention. It is a degree display when dividing the crack damage rate of brick. When the degree is 100, it is the same as the comparative example, and the smaller the value, the smaller the crack damage rate and the better.

In addition, the degree of squeezed bricks is the number of squeezed bricks dropped over one furnace when the slope 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 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.

Industrial applicability

The reversely inclined lining structure of the furnace having the throttle structure according to the present invention can be applied to all other furnaces using lining bricks.

FIG. 10 is a cross-sectional view showing a structure in which the present invention is applied to the lining of the chaotic wheel 30. The same parts as those in FIG.

Claims

The scope of the claims

[1] 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 of the lining brick (7a) constructed on the inner side of the throttle part (7) ( 14) is on the iron skin surface (la) of the throttle part (7) and faces the furnace bottom (4) force toward the furnace bottom (8) and is directed in the height direction along the iron skin (1). The lining brick is positioned on the acute side (13) between the height direction axis (12) and the vertical direction axis (11) perpendicular to the iron skin surface (la) of the straight body (6). (7a) A reverse inclined lining structure for a furnace having a constricted portion structure, characterized by comprising a structure of stacking.

[2] The diaphragm structure according to claim 1, wherein the thickness direction central axis (14) force forms an inverse inclination angle (16) of 5 to 30 degrees with respect to the vertical direction axis (11). Inclined lining structure of the furnace.

[3] The reverse inclined lining structure of the furnace having the throttle structure according to claim 1 or 2, wherein there is no step on the furnace inner surface (7aA) of the lining brick (7a) constructed in the throttle section (7). .

[4] The throttle structure according to any one of claims 1 to 3, wherein the furnace (20) is any one of a converter, an AOD furnace, a kneading wheel, and a hot metal pretreatment furnace. Inclined lining structure of the furnace.