JPH08159668A - Method for hot repair of high-temperature furnace wall and heat insulating device - Google Patents

Abstract

PURPOSE: To obtain a method for repair and a heat insulating device which dispense with regulation of a furnace pressure in hot repair of a kiln and also can be applied to all lining materials. CONSTITUTION: In a method for hot repair of a furnace wall lining of a high- temperature furnace wall, a parasol type heat insulating device 15 fitted with heat insulating cloth 14 made of fire-resistant fiber cloth by sewing is inserted, in a folded state, into a furnace of high-temperature atmosphere from an opening part 12 on the sheet iron shell side and opened inside the furnace and, in this state, the heat insulating cloth 14 is brought into close contact with an inner wall of the furnace. After measures for preventing impairment of a part outside the sphere of repair are taken from outside the furnace, an impaired part 10 of the lining in the sphere of repair is disjointed and removed and a lining material is applied thereto while only a minimum opening part for taking out the parasol type heat insulating device 15 being folded is left. Subsequently, the parasol type heat insulating device 15 is folded and then taken out from the minimum opening part, the lining material is applied lastly to the minimum opening part and a sheet iron shell 6a for a part of an opening for the repair is restored by welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of preventing hot air from being blown out of the furnace and invasion of outside air into the furnace when hot-repairing the furnace wall refractory of a high temperature atmosphere furnace, thereby preventing the opening of the furnace wall. The present invention relates to a heat shield device that can be attached more easily and a hot repair method using the heat shield device.

[0002]

2. Description of the Related Art In various industrial fields including the steel industry, heating equipment such as a heating furnace, a soaking furnace, and a heat treatment furnace (hereinafter referred to as a kiln) are installed. On the inner wall of the kiln, a regular or irregular refractory or ceramic fiber is lined as a heat insulating material. But the insulation inside the furnace is
It is impossible to prevent partial damage during use with any lining material.

As a repairing method when the lining material of the kiln is damaged, a means for suspending the kiln to lower the temperature of the kiln and cold repairing is widely adopted. For example, a means is adopted in which the lining material is dismantled from the inside of the furnace in a slightly wider area than the damaged portion, and the dismantled portion is renewed with a regular or irregular refractory material or ceramic fiber. However, in all of the above-mentioned conventional cold repairs, it is necessary to lower the temperature inside the furnace to the extent that an operator can enter the furnace and perform work. However, there is a problem that the repaired portion is likely to expand due to damages such as joint breakage and lining dropout due to expansion and contraction of the refractory and iron skin.

As a method for solving the above-mentioned problems of cold repair, in a steel-clad kiln in which a fibrous refractory is lined, the lining damaged portion is cut and removed together with the iron shell, and then heat is applied from the outside of the cutting opening. A refractory panel for repair in which a shielding plate is inserted into the furnace to close the cutting opening from the inside of the furnace to shield the heat radiation from the inside of the furnace and the ejection of high-temperature gas, and then a fibrous refractory is lined on the iron plate in advance. A method (Japanese Patent Laid-Open No. 123992/1990) is proposed in which the above-mentioned iron plate is welded to the iron skin after fitting a refractory material into the gap between the cutting aperture and the repair refractory panel. Has been done.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the method disclosed in Japanese Patent No. 992, when the lining damage portion is cut and removed together with the iron skin to open, it is necessary to adjust the furnace pressure to prevent hot air from blowing out. In addition, this repair method is effective only for repairing the furnace wall made of irregular refractory such as ceramic fiber or castable that fixes the lining material to the iron shell with studs or mounting bolts, but it is made of bricks. In the case of the existing furnace wall, if it is opened large, the joint will loosen and the joint will loosen, so there is a drawback that it cannot be applied.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, to eliminate the need for adjusting the pressure in the furnace for preventing the blowing of hot air, and to apply it to all lining materials in hot repair of hot furnace walls. A method and a heat insulating device are provided.

[0007]

Means for Solving the Problems As a result of various tests conducted to achieve the above-mentioned object, the present inventors found that a parasol type heat shield equipped with a heat insulating cloth sewn with a fireproof fiber cloth is folded. From inside the furnace without adjusting the pressure inside the furnace, insert it into the high temperature atmosphere furnace through the opening on the iron skin side, open the parasol type heat shield in the furnace, and bring the heat insulating cloth into close contact with the furnace inner wall in that state. It is possible to prevent the blowing of hot air into the furnace and the invasion of outside air into the furnace, and after taking measures to prevent damage outside the repair range from the outside of the furnace, remove the lining damaged part in the repair range and remove the folded parasol type heat shield. The lining material is applied, leaving only the minimum opening, and then the parasol type heat shield is folded in the furnace and taken out from the minimum opening.Finally, the lining material is applied to the minimum opening, and the iron shell of the opening is removed. By contacting recovery it was investigated that can be applied to all of the lining material, and reached the present invention.

That is, according to the present invention, in a hot repair method for a furnace wall lining of a high temperature furnace wall, a parasol type heat shield having a heat insulating cloth sewn with a refractory fiber cloth is folded and a high temperature is applied from an opening on the iron shell side. Atmosphere After inserting into the furnace, open the parasol type heat shield inside the furnace, and in that state, adhere a heat insulating cloth to the inner wall of the furnace, take measures to prevent damage outside the repair range from the outside of the furnace, and then repair the damaged lining Dismantled and removed, installed the lining material leaving only the smallest opening for taking out the folded parasol type heat shield, then folded the parasol type heat shield in the furnace, then taken out from the smallest opening, and finally the smallest opening. This is a hot repair method for a high-temperature furnace wall, which is characterized in that a lining material is applied to a portion, and the opening iron shell is restored by welding.

Further, according to the present invention, in a heat insulating device used for hot repairing a furnace wall lining of a high temperature furnace wall, a parasol type frame which can be opened and closed by operating a support rod composed of an outer tube and an inner tube is provided with a refractory fiber. A heat insulating device for hot repair of a high temperature furnace wall, which is characterized in that a heat insulating cloth sewn with a cloth is attached.

[0010]

In the present invention, the parasol type heat shield attached with the heat insulating cloth sewn with the refractory fiber cloth is inserted into the high temperature atmosphere furnace through the iron shell side opening in the folded state, and the parasol type heat shield is installed in the furnace. By opening the chamber and bringing the heat insulating cloth into close contact with the inner wall of the furnace in that state, it is possible to prevent hot air from blowing out of the furnace and invasion of outside air into the furnace without adjusting the furnace pressure. Further, in the present invention, after performing damage prevention measures outside the repair range from the outside of the furnace, the lining damaged part in the repair range is dismantled and removed, leaving only the minimum opening for taking out the folded parasol type heat shield. The lining material is applied, then the parasol type heat shield is folded in the furnace, taken out from the smallest opening, and finally the lining material is applied to the smallest opening, and the iron shell of the opening is restored by welding. Since the opening for taking out the equipment can be made small, it is possible to prevent the blowing of hot air from the furnace and the invasion of outside air into the furnace without adjusting the pressure inside the furnace, and also the fixed shape and irregular fire resistance. It can also be applied to all kinds of lining materials such as ceramics or ceramic fibers, and the parasol type heat shield is easy to install and can be installed in a short time. Can.

Further, in the heat insulating apparatus of the present invention, the heat insulating cloth sewn with the fire resistant fiber cloth is attached to the parasol type frame which can be opened and closed by the operation of the support rod composed of the outer tube and the inner tube. If it is folded and closed in the kiln furnace, it can be inserted from a small opening, and after inserting it into the kiln, operate the support rod to open the parasol part, then pull the support rod to insulate it. If the cloth is adhered to the lining material of the furnace wall, the heat insulating device can be installed without interrupting the work of the kiln. Moreover, after installing the heat shield, the lining material at the repaired place is immediately dismantled and removed, and when the transshipment is restored, leaving the minimum opening for taking out the folded parasol part, the parasol part is folded after restoration. It can be taken out in the state.

As the heat insulating cloth sewn with the fire resistant fiber cloth of the parasol type heat shield, by selecting from the heat insulating sheets of silica cloth, ceramic fiber cloth, and alumina fiber cloth sewn products, it can be attached up to a high temperature range of 1300 ° C. Is. The support rod of the parasol type heat shield may be air-cooled.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. 1 is a schematic sectional view of a heating furnace flue having a brick-laying structure as a lining material according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a partially damaged portion of a flue refractory brick, and FIG. 3 is a parasol type of the present invention. It is a sectional side view of the attachment situation of a heat shield. 1 to 3,
Reference numeral 1 is a heating furnace composed of a pre-tropical zone 2, a heating zone 3, a soaking zone 4, and a flue 5. Inside the iron skin 6 of the flue 5, a heat insulating board 7, a fireproof heat insulating brick 8 and a fireproof brick 9 are lined. Has been done. The ambient temperature of the flue 5 is 800 to 850 ° C. Reference numeral 10 is a partially damaged portion of the fireproof brick 9 of the flue 5, and 11 is a recuperator provided in the flue 5.

When the partially damaged portion 10 of the fireproof brick 9 of the flue 5 is partially repaired, the iron shell 6a of the partially damaged portion 10 is cut and removed, and then the parasol type heat shield is provided approximately at the center of the partially damaged portion 10. The heat insulating board 7, the fireproof heat insulating brick 8 and the fireproof brick 9 are opened using an air drill or a breaker in the minimum necessary range for carrying in. From this opening 12, the parasol part of the parasol type heat shield 15 having the refractory fiber cloth 14 attached to the parasol type frame 13 is inserted in the folded and closed state. The size of the opening 12 in this case is set to the minimum necessary for inserting the parasol part in the folded and closed state, so that it is not necessary to interrupt the work of the kiln, and It is possible to suppress the blowing of hot air and the invasion of outside air into the furnace,
No adjustment of furnace pressure is necessary.

The support rod 1 of the parasol type heat shield 15
Reference numeral 6 is a double pipe of an outer pipe 17 and an inner pipe 18, and cooling air 19 is blown into a gap between the outer pipe 17 and the inner pipe 18, so that the parasol portion of the parasol type heat shield 15 is opened and closed. It is easy to operate. After the parasol part of the parasol type heat shield 15 is inserted into the furnace through the opening 12, the outer tube 17 is further pushed in to open the parasol part. After the parasol has opened, the inner pipe 18 of the support rod 16
Is pulled to the outside of the furnace, the fireproof fiber cloth 14 attached to the parasol portion is brought into close contact with the fireproof brick 9 on the furnace wall, and the attachment of the parasol type heat shield 15 is completed.

After the installation of the parasol type heat shield 15 is completed, the brick support 20 is attached to the upper portion of the repaired part, and the heat insulating board 7, the fireproof heat insulating brick 8 and the fireproof brick 9 in the repair range are dismantled and removed. As a way to recover after that,
The heat insulating board 7, the fireproof heat insulating bricks 8 and the fireproof bricks 9 are stacked from the lower part while leaving the take-out opening of the parasol type heat shield 15 to a minimum. In this case, the brick receiving member 20 is removed from one side and sequentially replaced with the refractory brick 9, the refractory heat insulating brick 8 and the heat insulating board 7.

Therefore, the parasol-type heat shield 15 is installed during the dismantling of the insulation board 7, the fireproof insulation brick 8 and the refractory brick 9 in the repair range and during the work of stacking the insulation board 7, the fireproof insulation brick 8 and the refractory brick 9 from the bottom. Since the refractory fiber cloth 14 attached to the parasol portion is in close contact with the refractory bricks 9 on the furnace wall and shields the working environment from the high temperature atmosphere in the furnace, there is no adverse effect on the dismantling and transshipment work. Next, in removing the parasol type heat shield device 15, the parasol portion is closed by pushing the inner pipe 18 of the pulled support rod 16 into the furnace, and then the parasol type heat shield device 15 is taken out through the opening. Parasol type heat shield 1
When the removal of No. 5 is completed, the refractory bricks and the refractory insulation bricks are inserted into the openings, and the iron shell is welded to complete the repair work.

[0018]

As described above, according to the present invention,
Without interrupting the work of the kiln and adjusting the pressure inside the furnace, it is possible to prevent hot air from blowing out of the furnace and ingress of outside air into the furnace, and to ensure safety and reliability from outside the furnace. Can be repaired. Further, as a partial repair, a relatively wide range of about 1 m in diameter can be carried out at once.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a heating furnace flue having a brickwork structure as a lining material according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a partially damaged portion of a flue refractory brick.

FIG. 3 is a side sectional view of a mounting state of the parasol type heat shield of the present invention.

[Explanation of symbols]

 1 Heating Furnace 2 Pre-Tropical Zone 3 Heating Zone 4 Soaking Zone 5 Flue 6, 6a Iron Skin 7 Insulation Board 8 Fireproof Insulation Brick 9 Fireproof Brick 10 Partly Damaged Part 11 Recuperator 12 Opening 13 Parasol Type Frame 14 Fireproof Fiber Cloth 15 Parasol Mold heat shield 16 Support rod 17 Outer pipe 18 Inner pipe 19 Cooling air 20 Brick receiving hardware

Front page continuation (72) Inventor Yaichi Yoneda 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works

Claims (2)

[Claims] 1. A hot repair method for a furnace wall lining of a high temperature furnace wall, wherein a parasol type heat shield equipped with a heat insulating cloth sewn with a refractory fiber cloth is folded and the inside of the high temperature atmosphere furnace is opened from the iron shell side opening. After opening the parasol type heat shield in the furnace and making a heat-insulating cloth adhere to the inner wall of the furnace in that state, prevent damage outside the repair range from the outside of the furnace, and then dismantle and remove the lining damaged part in the repair range. Then, the lining material was applied leaving only the smallest opening for taking out the folded parasol type heat shield, then the parasol type heat shield was folded in the furnace and then taken out from the smallest opening, and finally the minimum opening was lined. A hot repair method for a high temperature furnace wall, which is characterized by constructing a material and recovering the welding of an opening skin. 2. A heat-insulating device used for hot repairing a furnace wall lining of a high-temperature furnace wall, wherein a parasol frame that can be opened and closed by operating a support rod composed of an outer tube and an inner tube is sewn with a fireproof fiber cloth. A heat insulating device for hot repair of high temperature furnace walls, which is equipped with a heat insulating cloth.