JP2000256716A - Structure for holding refractory in furnace body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refractory holding structure, with which the refractory for protecting the inner part of a furnace, such as a blast furnace, is difficult to receive large thermal stress and is stably held. SOLUTION: Plural grating holding blocks 11 are adjacently fitted to the inside of a cooling stave 9 as a furnace wall body and a brick as a rectangular parallelepiped refractory 13 is held in each section 44 of each grating holding block 11. The grating holding block is made of a steel plate and composed of a back plate 19 disposed at the inside of the furnace wall body, grating holding plates 25 disposing plural plate materials 21, 23 as the orthogonal state to the back plate and mutually grating state in each surface and outer peripheral plates 27 disposed as the orthogonal state in the surface to the back plate at the outer periphery of the back plate. The back plate 19 is fitted to the inside of the furnace wall body through high heat conductivity mortar and the holding of the refractory is executed with the high heat conductivity mortar or thrugh the mortar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a refractory on an inner wall of a furnace such as a blast furnace.

[0002]

2. Description of the Related Art In a blast furnace of an ironworks, iron ore as a raw material, coke as a heat source, a slug composition agent, and the like are charged from the upper portion, and are layered inside. Then, blowing hot air from the bottom of the tuyere to the interior, of iron ore in the internal Fe ₂ 0 ₃ and FeO
, And iron Fe is obtained as pig iron.

[0003] Since the inside of the furnace wall is exposed to the high temperature of the reduction reaction, the furnace wall body must be protected from damage due to the high temperature by using a refractory such as a brick or providing a cooling facility. In addition, in order for the reduction reaction to proceed efficiently, the high temperature inside the furnace must be maintained, so that heat loss through the furnace wall must be prevented by using a refractory such as a brick.

[0004] As a conventional cooling facility, there is one called a cooling stave. As shown in FIG. 6, the cooling stave 101 divides an inner part of the furnace wall into a plurality of blocks 103 made of cast iron, and provides a cooling water pipe 105 in each block 103 by casting, and each block 103 is adjacent to the block 103. The inside of the furnace wall is formed, and the pipe 105 of each block 103 communicates with the cooling water to flow cooling water to cool the furnace.

[0005] Inside the cooling stave 101,
There are a plurality of structures for holding bricks as refractories 107. For example, it has a structure in which a brick as the refractory 107 is cast into cast iron (Japanese Utility Model Laid-Open No. 63-159197).
In this structure, bricks are held tightly by cast iron,
Further, the thick portion of the cooling stave 101, which is the furnace wall main body, expands significantly due to thermal expansion, and the brick receives large thermal stress, causing cracks or, in extreme cases, the bricks falling.

On the other hand, as shown in FIG. 6 (A), irregularities are formed between the thick portion of the cooling stave 101 and the refractory 107 so that the refractory can be held loosely.
09 is formed, and the fitting is performed by the unevenness 109 to hold, and an expansion margin 111 is positively provided at the fitting portion (Japanese Patent Laid-Open No. 57-131981).

As shown in FIG. 6 (B), a locking projection 113 is formed on the cooling stave 101 side in an obliquely upward direction, and a locking recess 115 is formed in the refractory 107 in an obliquely upward direction. There is a structure in which the projection 113 and the recess 115 are used to hold and hold (see Japanese Patent Application No. 9-36842).
8).

[0008]

However, FIG.
In the structure (A), although the gradual holding is possible, the convex portion of the thick portion of the cooling stave 101 also expands significantly due to thermal expansion (arrow 117 in the figure), and the brick receives a large thermal stress.

In the structure shown in FIG. 6B, the effect of thermal expansion is small because the structure can be held gently and the locking is performed on the back side of the refractory 107. However, due to the partial locking of the locking projection 113 and the locking recess 115, the heavy refractory 1
07, it is difficult to maintain stable holding.

[0010] The present invention has been made to solve the above problems, and the refractory is less likely to receive large thermal stress.
An object of the present invention is to provide a refractory holding structure for a furnace that is stably held.

[0011]

Means for Solving the Problems To solve the above problems, the following invention is provided. A first invention is a structure for holding a refractory on an inner wall of a furnace, in which a plurality of grid-like holding blocks are attached adjacent to the inside of the furnace wall main body, and each of the grid-like holding blocks has a rectangular parallelepiped shape. A refractory holding structure for a furnace body characterized by holding a refractory.

According to a second aspect of the present invention, the lattice-shaped holding block is made of a metal plate, and a back plate disposed inside the furnace wall main body, and a plurality of plate members each of which faces each other with respect to the back plate. A furnace body, comprising: a grid-like holding plate arranged at right angles to each other in a grid pattern; and an outer peripheral plate arranged on the outer periphery of the back plate at a right angle to the back plate. It is a refractory holding structure.

[0013] The third invention is a refractory holding structure for a furnace body, wherein the metal plate is used in combination of one or more of a copper plate, a steel plate, and a stainless steel plate.

According to a fourth aspect of the present invention, the furnace wall body is constituted by a cooling stave, and the back plate is attached to the inside of the furnace wall body via a high heat conductive mortar, and The holding is performed through a highly thermally conductive mortar or a mortar, which is a refractory holding structure for a furnace body.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are shown in FIGS.
As shown in FIG. In a blast furnace 1 of an ironworks shown in FIG. 2, iron ore as a raw material, coke as a heat source, a slug composition, and the like are charged from a furnace port 3 on an upper part, and are layered inside. Then, hot air is blown into the inside from the lower tuyere 5 to cause a reduction reaction of Fe ₂ O ₃ and FeO of the iron ore therein, and iron F
e is obtained from the tap hole 6 as pig iron.

Since the inside of the furnace wall 7 is exposed to the high temperature of the reduction reaction, a refractory such as a brick is used or a cooling facility is provided to protect the furnace wall body from damage due to the high temperature and reduce the temperature of the furnace wall. High temperatures inside the furnace must be maintained for the reaction to proceed efficiently.

As shown in FIG. 1, the structure for holding a refractory of this embodiment is different from a cooling stave 9 as a conventional cooling facility through a grid-like holding plate 25 composed of a vertical plate 21 and a horizontal plate 23. Thus, it is a structure for holding a brick which is a refractory 13. For this brick, for example, a silicon carbide brick can be used.

The cooling stave 9 is, as in the prior art,
The inside portion of the furnace wall 7 is divided into a plurality of blocks 15, each of which is made of cast iron, and a pipe 17 for cooling water.
(See FIGS. 4 and 5). The inside of the furnace wall main body 7 is constituted by adjoining the blocks 15 vertically and horizontally, and the pipe 17 of each block 15 is communicated with the cooling water to cool the furnace. With the furnace wall 7 thus configured as a furnace wall main body, a plurality of grid-like holding blocks 11 are attached inside. Each lattice-shaped holding block 1
1 is vertically and horizontally adjacent.

As shown in FIGS. 1 and 3, each grid-like holding block 11 is made of a steel plate. That is, the back plate 19 is disposed inside the furnace wall main body. And a plurality of vertical plates 21
The horizontal plate 23 and the horizontal plate 23 are arranged in a lattice with each other at a right angle to the back plate 19 to form a lattice holding plate 25.

Further, an outer peripheral plate 27 is arranged on the outer periphery of the back plate 19 with the surface perpendicular to the back plate 19. The thickness of the back plate 19 depends on the adhesion to the cooling stave 9 and the refractory 1 to be supported.
The thickness is 3-4 mm, for example, in consideration of the weight of 3. The thickness of the vertical plate 21 and the horizontal plate 23 is, for example, about 1 mm in consideration of the expansion coefficient of the earthquake, the function as a metal joint as described later, and the like.

At this time, as shown in FIG. 3B, the horizontal plate 23 is welded 29 to the back plate 19. Then, at the intersection of the horizontal plate 23 and the vertical plate 21, the two 21, 23 are fixed to each other by the slits 31, 33 formed in the two 21, 23. Spot welding (not shown) or the like is performed on the main parts of both.

As shown in FIGS. 3 and 4, a bolt hole 35 is formed in the back plate 19, and a female screw hole 37 is formed in the cooling stave 9 correspondingly. And bolt 3
9 is screwed into the male screw hole 37 via the bolt hole 35. Further, a bolt hole 42 is formed in the outer peripheral plate 27, and a female screw hole (not shown) is formed in the cooling stave 9 correspondingly.

A bolt (not shown) is inserted into the bolt hole 42.
Into the male screw hole via. In this way, the grid-like holding block 11 is attached to the cooling stave 9. Note that a high thermal conductive mortar 41 is interposed between the back plate 19 and the cooling stave 9. The high thermal conductive mortar 41 is applied to the cooling stave 9 in advance.

Each section 44 formed by the grid-like holding plate 25 and the outer peripheral plate 27 constituting the grid-like holding block 11
Has a rectangular parallelepiped space in which a rectangular brick, which is the refractory 13, is held. At this time, a high heat conductive mortar 41 is interposed between the refractory 13 and the back plate 19, and a normal mortar 43 is interposed between the refractory 13 and the grid-like holding plate 25.

(Effects of Embodiment) According to this embodiment, the brick which is the refractory 13 is indirectly provided via the separate grid-like holding block 11 attached to the cooling stave 9 as the furnace wall main body. , The conventional FIG.
As shown in (A), it is possible to prevent the refractory from directly receiving the thermal stress due to the thermal expansion of the thick portion of the cooling stave 9.

Each section 4 of the grid-like holding block 11
2, since the rectangular parallelepiped refractories 13 are held one by one, stable holding is achieved as compared with the conventional structure shown in FIG. In particular, the refractory 13 is supported by the surface of the back plate 19 and the grid-like holding plate 25, and more stable holding is performed. In addition, unlike the conventional structure shown in FIGS. 6A and 6B, the shape of the cooling stave 9 does not need to be complicated, and the manufacturing cost can be reduced.

Further, the grid-like holding block 11 holds one refractory 13 in each section 42 formed by the back plate 19 made of a metal plate and the grid-like holding plate 25.
Therefore, these metal plates (19, 21, 23) are located between the refractories 13 to be adjacent to each other.

Therefore, under the thermal condition in which the steel sheet is softened, the metal plate acts as a metal joint, and the refractory 13 can be prevented from receiving a large thermal stress. Furthermore, refractories 13
The thermal expansion of the refractory 13 increases at the tip portion of the refractory 13 facing the center of the furnace and having a high temperature.

Therefore, as shown in an enlarged manner in FIG. 5, the tip portion of the refractory 13 becomes thicker like a wedge. Also in this case, the metal plate functions as an expansion allowance under the thermal condition in which the metal plate such as a steel plate is softened. Therefore, it is possible to prevent the refractory 13 from receiving a large thermal stress due to the thermal expansion of the refractory 13 itself.
Therefore, the durability of the refractory 13 and the durability of the blast furnace itself can be secured.

As shown in FIG. 5, the refractory 13 and the tips of the metal plates (21, 23, 27) are worn out (broken lines in the figure) and become shorter due to aging. Since the tip portions of the metal plates (21, 23, 27) are newly formed in a wedge shape, the effect of preventing the refractory 13 from receiving a large thermal stress due to the thermal expansion of the refractory 13 itself continues.

Further, the back plate 19 of the grid-like holding block 11
Is attached to the inside of the cooling stave 9 as a furnace wall body via a high heat conductive mortar 41,
The holding of the refractory 13 is performed by the grid-like holding plate 25 via the high heat conductive mortar 41 or the mortar 43, so that the members are fixed by the mortars 41 and 43. Therefore, handling during the work of attaching the grid-shaped holding block 25 and the work of holding the refractory 13 is facilitated.

Further, since the grid-like holding block 11 is cooled from the cooling stave 9, which is the furnace wall main body, through the high thermal conductive mortar 41, the strength of the grid-like holding block 11 at a portion far from the center of the furnace is prevented. it can.
In addition, since the inside of the furnace is in a reducing atmosphere, the lattice-shaped holding block 1
Oxidation of the thin steel plate constituting 1 is also suppressed. Therefore, the refractory 13 can be held firmly.

Further, since the refractory 13 is held by the grid-shaped holding block 11 via the high heat conductive mortar 41 or mortar 43, the mortar 41,
43 absorbs the thermal expansion of the refractory 13 and the grid-like holding block 11 that affect each other's thermal stress. Further, thermal stress due to a difference in thermal expansion between the refractory 13 and the grid-shaped holding block 11 is absorbed.

Further, even with the same lattice-shaped support block 11, the length of the refractory 13 to be held, that is, the thickness of the furnace wall can be freely selected, so that the heat loss can be controlled freely. Further, since the grid-like holding block 11 is made of a metal plate, high-precision manufacturing can be easily performed. For example, it can be easily and freely manufactured according to the shape of the curved surface or the flat surface of the cooling stave 9 of any kind.

(Other Embodiments) In the above embodiment, the furnace is the blast furnace 1 of an ironworks, but in other embodiments, another vertical furnace or the like may be used. Further, in the above embodiment, the metal plate forming the lattice-shaped holding block 11 is a steel plate. However, in other embodiments, a copper plate or a stainless steel plate may be used. Further, a combination of a plurality of steel plates, copper plates, and stainless steel plates may be used.

In the above embodiment, the grid-like holding plate 25 is composed of the vertical plate 21 located in the vertical direction and the horizontal plate 23 located in the horizontal direction. A plate material located in an oblique direction may constitute the grid-like holding plate 25.

Further, in the above embodiment, the brick which is the refractory 13 has a rectangular parallelepiped shape. However, in another embodiment, a brick with a warp may be used. In that case,
For example, after the bricks are held vertically in a row, one vertical plate 21 is attached to the horizontal plate 23 group, and the brick holding and the vertical plate 21 are again held.
Repeat the work of mounting. In the above embodiment, one refractory 13 is held in each section 44, but in other embodiments, a plurality of refractories may be held.

[0038]

As described above, according to the first, second, third or fourth invention, the refractory is held via the grid-like holding block attached to the furnace wall main body. As described above, it is possible to prevent the refractory from directly receiving the thermal stress due to the thermal expansion of the thick portion of the cooling stave. In addition, since the rectangular parallelepiped refractory is held in each section of the grid-shaped holding block, stable holding is achieved as compared with the conventional structure.

According to the second, third or fourth invention,
Furthermore, the lattice-shaped holding block holds the refractory by a back plate or a lattice-shaped holding plate made of a metal plate, and therefore, the thermal expansion of these metal plates themselves located between the refractories to be adjacent is small, Since the metal plate softens, it also acts as a metal joint. Therefore, it is possible to prevent the refractory from receiving a large thermal stress due to the thermal expansion of the lattice-shaped holding block.

Further, the refractory is supported by the surface by the back plate or the grid-like holding plate, and more stable holding is performed. Furthermore, the thermal expansion of the refractory itself increases in the high-temperature portion of the refractory facing the center of the furnace, but at the center of the furnace, the metal plate located between the refractories softens, Its own thermal expansion is absorbed. Therefore, it is possible to prevent the refractory from receiving a large thermal stress due to the thermal expansion of the refractory itself. Also, since the grid-like holding block is made of a metal plate,
High-precision manufacturing can be easily performed.

Further, according to the fourth invention, the back plate of the grid-like holding block is attached to the inside of the furnace wall body via a high heat conductive mortar, and the refractory is held by the high heat conductive mortar. Since the work is performed through the mortar or the mortar, handling during the work of attaching the grid-like holding block and the work of holding the refractory is facilitated.

Further, since the grid-like holding block is cooled from the cooling stave, which is the furnace wall main body, through the high heat conductive mortar, the strength of the grid-like holding block at a portion far from the center of the furnace can be prevented. Further, since the holding of the refractory is performed through the high thermal conductive mortar or mortar, the thermal expansion of the refractory and the grid-like holding block is absorbed by these mortars. The thermal stress caused by the difference in thermal expansion is absorbed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a grid-like holding block constituting a structure for holding a refractory of a furnace body according to one embodiment of the present invention is attached to a cooling stave as a furnace wall main body.

FIG. 2 is an overall schematic view showing a blast furnace which is the furnace body of FIG.

3A is a perspective view of the lattice-shaped holding block of FIG. 1 with a part cut away, and FIG. 3B is an enlarged exploded view showing a main part of FIG.

FIG. 4 is an enlarged longitudinal sectional view showing a main part of FIG.

FIG. 5 is an enlarged view for explaining the operation and effect of FIG.
(B) is a figure explaining the secular change of (A).

6A is a longitudinal sectional view showing a conventional refractory holding structure, and FIG. 6B is a longitudinal sectional view showing another conventional refractory holding structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Blast furnace (furnace body) 3 Furnace port 5 Blow tuyere 7 Furnace wall 9 Cooling stave 11 Lattice holding block 13 Refractory 15 Block 17 Piping 19 Back plate 21 Vertical plate 23 Horizontal plate 25 Lattice holding plate 27 Outer plate 29 Welding 31, 33 Slit 35 Bolt hole 37 Female screw hole 41 High heat conductive mortar 42 Bolt hole 43 Mortar 44 Section

Claims (4)

[Claims] 1. A structure for holding a refractory on an inner wall of a furnace body, wherein a plurality of grid-like holding blocks are attached adjacent to the inside of the furnace wall main body, and each of the grid-like holding blocks has a rectangular parallelepiped refractory. A refractory holding structure for a furnace body, characterized by holding an object. 2. The grid-like holding block is made of a metal plate, and a back plate disposed inside the furnace wall main body and a plurality of plate members are arranged in a grid shape at right angles to the back plate. The refractory holder of a furnace body according to claim 1, comprising: a grid-like holding plate disposed; and an outer peripheral plate disposed on an outer periphery of the back plate with its surface perpendicular to the back plate. Construction. 3. The structure for holding a refractory of a furnace body according to claim 2, wherein the metal plate is one or a combination of a copper plate, a steel plate, and a stainless steel plate. 4. The furnace wall body is constituted by a cooling stave, the back plate is attached to the inside of the furnace wall body via a high heat conductive mortar, and the refractory is held by a high heat conductive mortar. The refractory holding structure for a furnace body according to claim 2, wherein the mortar or the mortar is used.