JPH11264672A - Regular refractory for rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress chipping of refractory lining due to a load being applied from a bearing unit receiving a rotary kiln. SOLUTION: A regular refractory 3 constituting a rotary kiln is a hexahedron having trapezoidal cross-section wherein the plane 3a including the upper side of the trapezoid defines the furnace wall surface of the rotary kiln while the plane 3b including the lower side faces the tubular sheath of the rotary kiln and laminated thereon in the circumferential and axial direction to form a tubular furnace wall body. The regular refractory 3 for rotary kiln provided with a refractory elastic member 5 on the plane 3b at the refractory part 4. When the regular refractories 3 are assembled into a rotary kiln, the lining part of the furnace wall formed of the refractory part 4 can be displaced freely by the elastic member 5 and shifted loading from a bearing unit can be relieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fixed refractory for a rotary kiln.

[0002]

2. Description of the Related Art In a rotary kiln that rotates in a cement kiln, a lime kiln, or the like, a furnace wall body as a lining is formed by assembling a fixed refractory called a refractory block into a cylindrical shape. As shown in FIG. 4 or FIG. 5, for example, as shown in FIG. 4 or FIG.

[0003] The fixed refractory 1 shown in Fig. 4 has a flat surface on each side, an upper surface 1a including a trapezoidal upper side forms a furnace wall surface of a rotary kiln, and a lower surface 1b including a lower side forms a cylindrical outer shell of the rotary kiln. Left and right side 1 on the drawing so as to face
c, 1c are successively brought into contact with corresponding surfaces of a refractory of the same shape adjacent in the circumferential direction and laminated, and front and rear side surfaces 1d, 1d
Are successively brought into contact with the corresponding surfaces of fixed refractories of the same shape that are adjacent in the axial direction, and are laminated to form a tubular furnace wall.

The fixed refractory 2 shown in FIG. 5 has an upper surface 2a and a lower surface 2b having a concave arc surface and a convex arc surface, the concave upper surface 2a forms a furnace wall of a rotary kiln, and a convex arc lower surface. 2b is opposed to the cylindrical outer skin of the rotary kiln,
The flat left and right side surfaces 2c, 2c are arranged in the circumferential direction, and the front and rear side surfaces 2d,
2d are laminated in the axial direction. The rotary kiln is rotatably mounted by a rotary drive device.
It is held by the bearing device. Various configurations of the bearing device are conceivable depending on the drive system for transmitting the rotational driving force of the rotary drive device to the rotary kiln. In the case of a roller drive system as one of the drive systems, the roller is rotated by a rotary drive device, and the roller is brought into frictional contact with the outer periphery of the outer cover to rotate the rotary kiln, so that the roller serves as a bearing device.

[0005]

In the rotary kiln having the above structure, the total weight of the rotary kiln is received by the rollers, and the reaction force of the gravitational force causes the fixed refractories at the position of the rollers and the adjacent fixed refractories to be fixed. At the joint interface with the fixed refractory and the adjacent fixed interface with the fixed refractory. Such damage to the furnace wall of the rotary kiln (fireproof wall portion made of a fixed refractory) increases the frequency of furnace repair work and significantly reduces productivity.

The present invention has been made in view of the above circumstances, and alleviates a local eccentric load by a roller to a refractory wall portion of a furnace wall, thereby making a rotary kiln having good durability. It is an issue to provide fixed refractories for use.

[0007]

In order to solve the above problems, the inventors of the present invention have conducted various studies, and the outer covering of the refractory wall of the furnace wall is elastically displaced independently of the refractory wall. By using a fixed refractory for a rotary kiln that can constitute a rotary kiln as described above, it is thought that the uneven load on the fire-resistant wall portion at the roller position of the fixed refractory for the rotary kiln can be reduced, and the present invention has been completed. Was.

That is, the fixed refractory for a rotary kiln of the present invention has a trapezoidal hexahedron cross section, a surface including an upper side of the trapezoid forms a furnace wall of the rotary kiln, and a surface including a lower side corresponds to the rotary kiln. A fixed refractory for a rotary kiln that is opposed to a cylindrical outer shell of a kiln and is laminated in a circumferential direction and an axial direction to form a cylindrical furnace wall, and includes a heat-resistant elastic member on a surface including the lower side. It is characterized by doing.

[0009]

The above-mentioned fixed refractory for a rotary kiln has a refractory portion formed in a cylindrical shape as a refractory wall constituting a lining of the rotary kiln, and an elastic member provided on one surface of the refractory portion facing the outer skin. Composed of Therefore, when the fixed refractory for a rotary kiln is formed in a tubular shape as a furnace wall of the rotary kiln, the refractory wall portion of the rotary kiln including the refractory portion can be independently displaced by the elastic member. As a result, even if a load is applied to the outer shell coated with the fixed refractory for the rotary kiln at the roller position, the elastic member is only elastically deformed, and almost no load is applied to the tubular refractory wall as the lining, and Chipping and breakage of the wall can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The fixed refractory for rotary kilns of the present invention has a trapezoidal hexahedron cross section, a surface including an upper side of the trapezoid forms a furnace wall surface of the rotary kiln, and a surface including a lower side has a surface including a lower side. The rotary kiln is composed of a refractory part made of a fixed refractory facing the cylindrical outer skin, and an elastic member attached to one surface of the refractory part.

The refractory portion is formed into a hexahedron having a trapezoidal cross section suitable for forming a cylindrical furnace wall. As the hexahedron, various shapes corresponding to the cylindrical use location, for example, trapezoidal flat surfaces (see FIG. 4), and trapezoidal surfaces including upper and lower sides formed in an arc shape (FIG. 5) Alternatively, one formed in a tapered shape in the axial direction can be used. Refractory materials are MgO, CaO, CrO ₂
Or Al ₂ O ₃ or the like can be used.

As the elastic member, a heat-resistant fiber assembly or a corrugated plate formed by corrugating an iron plate can be used. The fiber aggregate may be a sheet formed by accumulating carbon, silicon carbide, and ceramic fibers. Corrugated plate material is S
An iron corrugated material such as S400 may be used as a material, and a single plate may be formed into a corrugated shape, or a plurality of band-shaped plate materials may be curved in a direction orthogonal to the length direction.

The elastic member can be partly buried or integrated in a form including a trapezoidal lower side of the fixed refractory.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fixed refractory for a rotary kiln according to the present invention will be described with reference to FIG. As shown in FIG. 1, a fixed refractory 3 for a rotary kiln according to one embodiment has a trapezoidal cross section, an upper surface 3a including an upper side of the trapezoidal shape, a lower surface 3b including a lower side, and the upper surface 3a and the lower surface 3b. And a hexahedral refractory material portion 4 having left and right side surfaces 3c and front and rear side surfaces 3d adjacent to each other in the left, right, front and rear directions, and an elastic member 5 joined to the lower surface 3b of the refractory material portion 4.

The elastic member 5 is made of JIS standard SS400.
It is made of a corrugated plate formed by corrugating a single plate made of iron corrugated material. One of the peaks of the waveform has flatness, and the joint area with the refractory member 4 is increased. The means for joining the elastic member 5 to the refractory part 4 is adhesion here. The refractory material part 4 used MgO. A paper board 6 such as a cardboard is adhered to the front and rear side surfaces 3d of the refractory material portion 4.
Further, an iron plate 7 such as an iron corrugate is bonded to the left and right side surfaces 3c of the refractory member 4 by bonding.

The method for assembling the fixed refractory 3 for a rotary kiln having the above structure as a furnace wall of a rotary kiln can be performed in the same manner as in the prior art, as shown in FIG. That is, the refractory mortar of the fixed refractory 3 for the rotary kiln that is adjacent in the circumferential direction is previously applied so that the upper surface 3a forms the furnace wall surface of the rotary kiln and the lower surface 3b faces the cylindrical outer skin of the rotary kiln. The side surface 3c is brought into contact. Further, the front and rear side surfaces 3d of the fixed refractory 3 for the rotary kiln that are adjacent in the axial direction are brought into contact with each other. When the joining in the circumferential direction and the joining in the axial direction are sequentially performed, a tubular furnace wall body 9 whose outer periphery is covered with the elastic member 5 is formed. Next, the cylindrical kiln wall 9 is set on the iron outer shell 8, and the rotary kiln is assembled. The rotary kiln is supported by a roller 10 at a lower position rotated by a rotation drive device (not shown).

In the rotary kiln having such a structure, the refractory portion 4 can be independently displaced by the elastic member 5 with respect to the lining portion (fireproof wall portion) 9a of the rotary kiln formed by the refractory portion 4. Therefore, the uneven load on the specific fixed refractory 3 for rotary kiln or the joining interface between adjacent fixed refractories 3 for rotary kiln to which the load from the roller 10 is applied is absorbed by the elastic member 5, and the furnace wall is chipped or damaged. Can be reduced as much as possible and the frequency of repairs can be reduced, so that the furnace downtime can be shortened and productivity can be greatly increased.

As another embodiment of the present invention, the elastic member 5
As shown in FIG. 3, carbon, silicon carbide, ceramic, or the like may be formed in a fiber shape, and may be constituted by a fiber integrated body in which these are integrated in a sheet shape.

[0019]

As described above, according to the present invention, the outer skin can be freely displaced with respect to the refractory portion constituting the lining of the rotary kiln, so that chipping damage to the inner wall of the furnace wall of the rotary kiln is reduced. In addition, the frequency of the repair work can be reduced to greatly improve the productivity.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a fixed refractory for a rotary kiln of the present invention.

FIG. 2 is a cross-sectional view of a rotary kiln assembled using the fixed refractory for a rotary kiln of the above embodiment.

FIG. 3 is a view showing another embodiment of the fixed refractory for rotary kilns of the present invention.

FIG. 4 is a view showing a conventional fixed refractory for a rotary kiln.

FIG. 5 is a view showing another conventional fixed refractory for a rotary kiln.

[Explanation of symbols]

3 ... fixed refractory for rotary kiln, 3a ... upper surface, 3b ...
Lower surface, 4 ... refractory part, 5 ... elastic member.

Claims (3)

[Claims] 1. A cross section of a trapezoidal hexahedron, and a surface including an upper side of the trapezoid forms a furnace wall of a rotary kiln;
The surface including the lower side faces the cylindrical outer skin of the rotary kiln,
What is claimed is: 1. A fixed refractory for a rotary kiln, which is laminated in a circumferential direction and an axial direction to form a cylindrical furnace wall, comprising a heat-resistant elastic member on a surface including the lower side. Fixed refractories. 2. The fixed refractory for a rotary kiln according to claim 1, wherein the elastic member is a corrugated steel corrugated plate. 3. The fixed refractory for a rotary kiln according to claim 1, wherein the elastic member is a sheet material formed of a heat-resistant fiber assembly.