JP2009108363A - Reverse-inclination lining structure of furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reverse-inclination lining structure of a furnace, which prevents a deviation or slippage of bricks from occurring in furnace construction due to a process of reverse-inclination-piling a part or all of the lining bricks in a straight body part of the furnace, facilitates the construction of the furnace and shortens an execution period of time. <P>SOLUTION: The reverse-inclination lining structure of the furnace is a structure of having piled up first lining bricks 6a so that the center axis in a first thickness direction of the first lining bricks 6a in the straight body part 6 is located in between an axis in a first height direction extending toward a height direction along the iron shell face 1a from a furnace bottom 4 to a throat 8 and an axis in a vertical direction with respect to the iron shell face 1a, on the iron shell face 1a of the straight body part 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a novel improvement for achieving prevention of brick cracking and falling off and stable operation by applying an inclined lining structure to furnaces such as converters, AOD furnaces, hot metal pretreatment furnaces, and kneading vehicles.

  Conventionally, a lining brick of a straight body part of a converter or the like is a horizontal stack lined perpendicularly to a straight body part iron skin. On the other hand, the inner brick of the throttle part is the same as the horizontal stacking lining structure of the straight barrel part, or the central axis in the thickness direction of the throttle inner brick is perpendicular to the throttle iron skin direction and the straight shell An inclined stacking lining structure is applied to be stacked so as to be located on the obtuse angle side between the two directions. Further, in the horizontal stacking structure, the base of the throttle part, that is, the lining brick of the throttle part near 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. This is a factor. Therefore, the life of the furnace is shortened, and in order to solve this, an inclined stacking lining structure and a reverse inclined stacking lining structure have been proposed as structures for dispersing the concentration.

In relation to the former structure, the following patents are disclosed.
First, Patent Document 1 and Patent Document 2 illustrate an inclined stacked structure and a horizontal stacked structure.
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 by stacking so that the angle formed between the axis and the surface of the lining brick is smaller than the angle formed between the furnace axis and the drawn iron core. A structure is disclosed.
Furthermore, the structure of patent document 6 is illustrated as a reverse-tilt stacking lining structure.
In addition, in common with these, the straight body portion is constituted by a horizontally stacked lining.

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 2006-200824 A

  Since the conventional lining structure is configured as described above, the following problems exist. In other words, compared with the lining with the squeezed part horizontally stacked, the lining with the squeezed part inclined has a stress reduction effect and shows the effect, but the brick is slipped off during building or the brick is in use. It may come off. Moreover, even if the furnace can be built without any troubles, many times during the operation of the furnace, the slanted pile at the throttle part is always subjected to the force of falling downward due to gravity. At the end, bricks may fall out. Furthermore, according to the applicant's research, in the first place, the slanted stacking of the throttle part reduces the stress that leads to the cracking of the brick, but there is a tendency that a gap is generated between the bricks of the throttle part compared to the horizontal stacking of the throttle part. all right. On the other hand, the short life of such squeezed bricks also affects the straight barrel bricks of the horizontally stacked lining, leading to falling off of the straight barrel bricks and early damage.

Among the above-mentioned patent documents, the configuration of Patent Document 6 shows a considerable effect, and the squeezing bricks are not dropped off, but the squeezing bricks are not dropped and the life of the furnace is extended. The next problem is the damage to the straight barrel brick. For example, due to damage caused by slag or molten iron, or damage due to the effect of top blowing treatment found in a converter, the straight body brick is damaged more significantly than other parts. The feature of the damage to the straight barrel bricks is that the thickness gradually decreases with the continuation of the damage, and at some point it drops off at a stroke with a certain thickness.
In view of the above circumstances, the present invention aims at further reinforcement and improvement of the structure of the above-mentioned Patent Document 6, and reverse tilting of the furnace that can prevent the state where the straight barrel bricks fall off at a stretch with a certain thickness. The purpose was to obtain a lining structure.

  A reverse inclined lining structure of a furnace according to the present invention is a reverse inclined lining structure of a furnace formed in a furnace having a straight body portion, and is a first lining brick to be constructed inside a part or all of the straight body portion. The first thickness direction central axis is on the iron skin surface of the straight body portion, and the first height direction axis and the straight body are directed from the furnace bottom to the furnace port in the height direction along the iron skin surface. The first lining brick is stacked so as to be positioned between the vertical axis perpendicular to the iron skin surface of the part, and the throttle part positioned above the straight body part The second thickness direction central axis of the second lining brick to be constructed inside is on the iron skin surface of the drawn portion and in the height direction along the iron skin surface from the furnace bottom toward the furnace opening. Located within an acute angle between the second height direction axis facing and the vertical axis perpendicular to the iron skin of the straight body The second lining bricks are stacked to form the narrowed portion, and the first and second thickness direction central axes are opposite to the vertical axis by 5 to 30 degrees. The first and second lining bricks have a configuration having no step on the inner surfaces of the first and second furnace bricks, and the furnace includes a converter, an AOD furnace, a kneading wheel, This is a configuration that is one of the hot metal pretreatment furnaces.

  Since the inversely inclined lining structure of the furnace according to the present invention is configured as described above, the following effects can be obtained. In other words, it is possible to easily construct a furnace without shifting or falling out of bricks during the construction of the furnace by making the inner brick construction of the converter, AOD furnace, hot metal pretreatment furnace, kneading car, etc. Therefore, the effect of greatly 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, and further, there is no gap between the bricks. Moreover, even if the wear of the brick progresses and the remaining thickness decreases, it does not fall off at a stretch, so that the furnace life can be extended and stable operation can be achieved. In addition, since repair work that has been performed in the past for damage or falling off of bricks and the accompanying repair materials are not required, the operating cost of the furnace can be significantly reduced compared with the conventional one, coupled with the effect of extending the life of the furnace. .

  The present invention is a lining that can be easily built without shifting or falling out of bricks during the construction of the furnace by setting the lining bricks of the furnace to be reversely inclined, and stress concentration due to the expansion of bricks during use. It is a lining that prevents cracking of bricks without causing cracks, and further, there are no gaps between bricks during use, and they do not fall off at a stretch even if the bricks wear out and the remaining thickness decreases. It is an object of the present invention to obtain a reverse inclined lining structure of a furnace having such a structure.

A preferred embodiment of a reverse inclined lining structure for a furnace according to the present invention will be described below with reference to the drawings.
Usually, brick construction of the furnace 20 is performed upward from the bottom 20a of the furnace 20. 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. The perma lining 2 may be a brick that is a regular refractory, or a castable, stamp material, filler, or the like that is an irregular refractory. On the other hand, the wear lining 3 is a brick having a predetermined shape. These perma lining 2 and wear lining 3 are applied from the furnace bottom 4 with the furnace 20 standing as shown in FIG. 1, and are applied from the bottom to the top in order of the furnace bottom 4 and the lower corner portion 5. When the construction is performed up to the lower corner portion 5, the straight body portion 6 is constructed. Here, the first liner brick 6a or the second liner brick 7a of the wear lining 3 of the straight barrel portion 6 or the straight barrel portion 6 and the throttle portion 7 above the straight barrel portion 6 is reversely inclined according to the present invention. It is constructed with product lining. Furthermore, the upper side becomes the furnace port 8.

  The angle of the wear lining 3 of the lower corner portion 5 and the wear lining 3 of the straight barrel portion 6 may be the same as long as they are reversely inclined, and if they are different, the reverse of the straight barrel portion 6 is directly above the lower corner portion 5. Inclined brick cannot be constructed. The same is true between the straight body portion 6 and the throttle portion 7. Therefore, the first switching brick 9 a is used between the lower corner portion 5 and the straight barrel portion 6, and the second switching brick 9 b is used between the straight barrel portion 6 and the throttle portion 7. As shown in FIG. 2, each of the switching bricks 9a to 9b uses one or plural switching bricks to adjust the difference in angle between the two parts. Further, a second brick 10 is stacked up to the upper portion of the throttle portion 7, and is returned to the horizontal again at the furnace port 8, and a return brick 10 is provided so as to contact the iron skin 1 of the furnace port 8. Although FIG. 1 shows an example in which the last one is the upper return brick 10, a plurality may be used.

  As shown in FIG. 2 and FIG. 3, the inner bricks 6a to 7a of the wear lining 3 having the inversely inclined product of the straight body portion 6 to the throttle portion 7 are arranged as shown in FIGS. 2 The furnace inner surface 7aA (working surface) and the first back surface 6aB or the second back surface 7aB may be smoothly stacked, or as shown in FIGS. Also good. However, since the protruding portion of the step is easily broken during use, it is desirable that the first furnace inner surface 6aA to the first furnace inner wall 6aA to the first inner brick 6a to the second inner brick 7a or the second inner brick 7a applied to the straight body portion 6 to the throttle portion 7 are desirably used. 2 and FIG. 3 in which the furnace inner surface 7aA has no step is better.

  The reverse inclination angle in the reverse inclination lining by the lining bricks 6a to 7a formed in the straight body portion 6 to the throttle portion 7 is determined as follows. That is, as shown in FIG. 9, the vertical axis 11 directed to the first furnace inner surface 6 a A to the second furnace inner surface 7 a A and the iron shell of the straight barrel portion 6 or the throttle portion 7 perpendicularly to the core 1 of the straight barrel portion 6. 1 between the first and second height direction shafts 12 and 12a heading in the height direction and the acute angle 13 formed between the straight body portion 6 and the throttle portion 7 of each lining brick 6a to 7a. The manner of arrangement through which the first and second thickness direction central axes 14 and 14A pass is the reverse inclined stack.

The construction in which the thickness-direction central axes 14 and 14A of the inner bricks 6a and 7a pass between the opposite direction of the height-direction axes 12 and 12a and the vertical axis 11 is an inclined product. In addition, as for the reverse inclination angle 16 which is an angle formed between the thickness direction central axes 14 and 14A of the lining bricks 6a to 7a and the vertical axis 11 in FIGS. In this case, the effect is desirably 5 to 30 degrees. If the angle is less than 5 degrees, the effect of suppressing crack generation between the inner lining bricks 6a to 7a and the gap formation between the inner lining bricks 6a to 7a, which is the object of the present invention, is reduced. Dropout is likely to occur. However, in order to prevent the lining bricks 6a to 7a from coming off even when the angle exceeds 30 degrees, for example, the dowels (not shown) are provided on both the upper and lower surfaces or one side of each lining brick 6a to 7a to prevent falling off. May be.
The construction method of the present invention is effective when used in a converter, AOD furnace, kneading vehicle, hot metal pretreatment furnace or the like having a straight body or throttling structure.

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

The construction time ratio in Table 1 is the construction time including preparation in the straight body part or the drawing part when horizontal stacking or inclined product construction is carried out as a comparative example in the same furnace as the present invention. It is the ratio when the construction time including preparation in is divided. 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 damage to cracks in the straight body or squeezed part in Table 1 was caused by crack damage in the straight body or squeezed part bricks when horizontal stacking or inclined product construction was carried out as a comparative example in the same furnace as the present invention. It is a degree display when the damage rate (mm / ch) is divided by the crack damage rate of the straight body part or the drawn part brick of the present invention. 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.

In addition, the degree of dropout of the straight body part or throttle part brick is the same as the present invention in the same furnace as the comparative example. It is a degree display when the number of falling-out bricks in the invention is divided. When the degree is 100, it is equivalent to the comparative example, and the smaller the numerical value, the smaller the drop-off 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 reversely inclined lining structure of a furnace having a straight body part or a throttle part structure according to the present invention can be applied to all furnaces using lining bricks.
12 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 by this invention. It is an expanded sectional view of the principal part of FIG. 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 switching brick 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 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 1a Iron skin surface 2 Perma lining 3 Wear lining 4 Furnace bottom 5 Lower corner part 6 Straight trunk | drum 6a 1st lined brick 6aA 1st furnace inner surface 6aB 1st back surface 7 Restricted part 7a 2nd lined brick 7aA 1st 2 Furnace inner surface 7aB Second back surface 8 Furnace 9a First switching brick 9b Second switching brick 10 Return brick 11 Vertical axis 12 First height direction axis 12a Second height direction axis 13 Vertical direction axis 11 and first, Acute angle between the second height direction axes 12, 12a 14 First thickness direction central axis 14A Second thickness direction central axis 16 Reverse tilt angle 20 Furnace 30 Chaos

Claims (5)

  In a reverse inclined lining structure of a furnace formed in a furnace (20) having a straight body part (6), a first lining brick (6a) to be constructed inside a part or all of the straight body part (6) The first thickness direction central axis (14) is on the iron skin surface (1a) of the straight body portion (6) and faces from the furnace bottom (4) to the furnace mouth (8). Between the first height axis (12) heading in the height direction and the vertical axis (11) perpendicular to the iron skin (1a) of the straight body (6) Thus, the reverse inclined lining structure of the furnace characterized by comprising the structure which piled up said 1st lining brick (6a).   A second central axis (14A) in the second thickness direction of the second lining brick (7a) constructed inside the throttle part (7) located above the straight body part (6) is connected to the throttle part (7). A second height axis (12a) on the iron skin surface (1a) and from the furnace bottom (4) toward the furnace mouth (8) and in the height direction along the iron skin surface (1a); The second lining brick (7a) is positioned so as to be located within an acute angle (13) between the straight barrel portion (6) and the vertical axis (11) perpendicular to the iron skin surface (1a). 2. A reverse inclined lining structure for a furnace according to claim 1, wherein the constricted portion (7) is stacked.   The first and second thickness direction central axes (14, 14A) form an inverse inclination angle (16) of 5 to 30 degrees with respect to the vertical direction axis (11). Inverted lining structure of the described furnace.   The reverse of the furnace according to any one of claims 1 to 3, wherein there is no step on the inner surface (6aA, 7aA) of the first and second furnace bricks (6a, 7a). Inclined lining structure.   The reverse inclined lining structure for a furnace according to any one of claims 1 to 4, wherein the furnace (20) is any one of a converter, an AOD furnace, a kneading wheel, and a hot metal pretreatment furnace.

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