JPH11264673A - Burner port refractory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner port refractory for heat treatment furnace, protective cover for molten metal vessel or cover for heating furnace or melting furnace in which the burner port refractory susceptible to damage through exposure to highest heat can be repaired or replaced without interrupting operation of the enter furnace. SOLUTION: Planar heat insulating materials are formed in R-shape and arranged while alternating the joints from layer to layer with the R part directing in the direction touching a flame. The heat insulating material is then compressed uniformly over the entire circumference or length by means of a support metal shorter than the heat insulating material and fixed while laminating. It is then passed, between support metals, through a comb fixed thereto at one end and secured while being compressed. In such a burner port refractory, a flange 10 for securing the refractories is provided on the outer circumference of an iron skin 7 of the burner port refractory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner port refractory such as a protective cover for a molten metal container, a heating furnace, a melting furnace cover, and a heat treatment furnace.

[0002]

2. Description of the Related Art A protective cover for a molten metal container, a heating furnace,
Conventionally, a refractory having a burner port such as a melting furnace lid or a heat treatment furnace has a tapered refractory having a heating burner port and a refractory attached to the outer periphery of a steel shell of the tapered refractory. Since the refractory has a burner port, work such as repair and replacement of the burner port cannot be performed unless the refractory lid is removed together with the refractory. In addition, there are various mounting structures such as the material of the heat insulating material used for the refractory and the construction method, and there is a problem with the life of the refractory.

As a method of attaching a heat insulating material to a refractory which is exposed to high heat such as a conventional molten metal container, a method applied by the present inventors in Japanese Patent Application No. 8-253658 is adopted. . In this method, after the plate-shaped heat insulating material is formed in an R shape, the R-shaped portion is arranged in such a manner that the seams are alternately arranged in each layer so as to face the direction of contact with the flame. The entire circumference or the entire length of the insulation is uniformly compressed and the insulation is laminated and attached.The refractory which is fixed by compressing the insulation by passing a comb with one end attached to the support hardware through the insulation between the support hardware is burned. A method and structure for mounting a refractory fixed to the outer periphery of a refractory steel shell are disclosed.

[0004]

These are the construction of refractories fixed to the outer periphery of the steel shell of the refractory at the burner opening, shortening and simplification of construction time, prevention of refractory peeling in a high temperature region,
Although it is effective in extending the life of the furnace body and the refractory alone, in the case of refractories having a burner port, such as a protective cover for a molten metal container, a heating furnace, a lid of a melting furnace, and a heat treatment furnace, the burner port refractory. Since the object and the refractory fixed to the outer periphery of the iron skin are integrated, even if the burner mouth refractory is only partially dropped or damaged, the entire lid can be removed,
It was necessary to stop the entire heating furnace and repair the refractories.

An object of the present invention is to provide a refractory having a burner port, such as a protective lid for a molten metal container, a heating furnace, a lid of a melting furnace, and a heat treatment furnace, which is most likely to be exposed to high heat and to be easily damaged. It is intended to provide a burner port refractory which can carry out the repair and replacement without stopping the whole furnace.

[0006]

According to the present invention, a heat insulating material is formed by forming a plate-like heat insulating material into an R shape, and then arranging the R shape portion in a direction in which it comes into contact with a flame so that seams are alternately formed in each layer. The lower and lower support hardware uniformly compresses the entire circumference or the entire length of the heat insulator, and the heat insulator is laminated and attached.The heat insulator between the support hardware is compressed by passing a comb with one end attached to the support hardware. In the fixed refractory, a burner opening refractory is provided, wherein a flange for fixing the refractory is provided on an outer periphery of a steel shell of the burner opening refractory.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention discloses a technique for a refractory lid of a molten metal container having a heating burner port. The conventional refractory lid is provided with a refractory fixed to the outer periphery of the iron shell, but in the present invention, the outer periphery of the iron shell of the refractory lid and the burner opening at the center part are detachable. It is. This refractory itself is disclosed in Japanese Patent Application No. 8-25 / 1996.
No. 3658 filed is used, and the form is as follows.

Referring to the drawings, FIG. 1 and FIG.
Is a refractory lid of a molten metal container having a burner port, in which a plate-shaped heat insulating material 1 made of silica-alumina ceramic fiber is folded in two, and an R-shaped bent portion is directed upward. It is wound around the burner opening 3 made of a refractory on the outer wall steel 2 and attached. After making one round of the burner opening 3, a leaf spring-like support having a height of about 2/3 of the height of the heat insulating material 1 folded in two on the outside thereof and having lateral holes 4 formed at regular intervals in the longitudinal direction of the upper part. The metal piece 5 is wound and tightened. The tightening is performed until the heat insulating material 1 is compressed by about 10 to 20%.

Thereafter, the support hardware 5 is fixed on the outer wall steel shell 2 by welding. Next, the heat insulating material 1 folded in two is wound around the outside, and several layers are laminated. Then, the support metal 5 similar to the above is wound around the outside, and 10 to 2 in the same manner as above.
It is tightened until it is compressed by about 0%, and then it is fixed by welding to the outer skin 2. Thereafter, the horizontal comb 6 is inserted into the heat insulating material 1 through the lateral holes 4 formed in the support hardware 5 at regular intervals in the circumferential direction, and is passed through the lateral holes 4 formed in the inner support hardware 5 (through the horizontal holes 4). Since the horizontal hole 4 is formed in the upper part of the support hardware, the horizontal comb 6 passes through the center of the heat insulating material 1, that is, half the height of the heat insulating material.)
The length of the horizontal comb 6 spanned between the support hardware is
In order to reduce the thermal effect (linear expansion) on the support metal, the distance between the support metal and the support should be as short as possible. When passing the horizontal comb 6, the horizontal comb 6 happens to hit the support hardware 5 between the horizontal holes, and when the horizontal comb 6 cannot pass through the horizontal hole 4, the insertion position is changed.

As described above, after several layers of the heat insulating material 1 are laminated, the work of winding and tightening the support hardware 5 and fixing it by welding is repeated up to the outer periphery. Thus, the heat insulating material 1 and the support hardware 5 are formed concentrically around the burner opening 3. At the time of construction, the support hardware 5 is pulled out from the coiled shape and cut to the required length.
The heat insulating material 1 has a certain length. For this purpose, a seam is formed, but the heat insulating materials 1 of the inner and outer layers are mounted so that the seam is shifted and preferably alternated. In order to prevent the invasion of the flame and the thermal expansion, the insertion positions of the horizontal combs 6 are alternately arranged as shown in FIG. In this way, a removable refractory is constructed around the outer periphery of the steel shell of the refractory lid.

With respect to the refractory lid constituting the burner port 3 of the present invention, a Y-stat 8 for fixing the refractory is provided inside the outer shell 2 to form a cylindrical refractory (castable). 9) is adhered inside, and the periphery of the burner opening is made of a refractory structure as a burner tile. FIG. 3 is a sectional view of a fixed refractory filed in Japanese Patent Application No. 8-253658, and FIG. 4 is a sectional view of a detachable refractory according to the present invention. Although the fixed type refractory is provided on the outer steel shell 2, this part cannot be attached or detached because it is fixed on the outer steel shell 2. The detachable refractory of the present invention is provided with a flange 10 on the outer shell of an iron shell 7 so as to be detachable, and the refractory constituting the burner opening 3 and the refractory on the outer iron shell 2 during use. The flange is fastened by bolts 11 so that the object does not come off and is fixed. However, during repair and inspection, this flange joint can be removed, and the refractory constituting the burner opening 3 and the refractory on the outer steel shell 2 are separated. It has a possible structure. When the bolt 11 is removed, only the burner opening 3 composed of the iron shell 7, the Y-stat 8, and the castable 9 can be extracted. After removal, the burner port 3 is repaired for the castable 9, attached to the lid, and fixed by tightening the bolt 11.

[0012]

The present invention is configured as described above and has the following effects. By covering a tapered cylindrical refractory having a structure with a heating burner in the center with a steel shell and providing a flange on the outer periphery of the steel shell to fix the refractory, the refractory at the burner opening and the outer iron are provided. The structure allows the refractory on the skin to be separated and replaced so that even if the burner opening is broken, it is not necessary to replace the entire burner, leading to an improvement in work efficiency as well as a reduction in cost. Furthermore, without stopping the furnace,
Can be replaced quickly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a refractory lid of a molten metal container having a burner port.

FIG. 2 is a partially cutaway sectional view of a refractory lid of a molten metal container having a burner port.

FIG. 3 is a sectional view of a conventional fixed refractory.

FIG. 4 is a cross-sectional view of the detachable refractory of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation material 2 Outer iron skin 3 Burner opening 4 Side hole 5 Support hardware 6 Horizontal comb 7 Iron skin 8 Y stat 9 Castable 10 Flange 11 Bolt 12 Burner

Claims (1)

[Claims] After forming a plate-shaped heat insulating material in an R shape, the R shape portion is oriented in a direction in which it comes into contact with the flame, and the seams are arranged alternately in each layer. In the case of a refractory in which the entire circumference or the entire length of the material is uniformly compressed, the heat insulating material is laminated and attached, and the heat insulating material is compressed and fixed by passing a comb having one end attached to the support metal to the heat insulating material between the support hardware. A burner mouth refractory, characterized in that a flange for fixing the refractory is provided on an outer periphery of a steel shell of the mouth refractory.