JP3105776B2 - Heat insulation device for hot repair of industrial kiln - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for repairing and inspecting an industrial kiln including a flue, particularly an oval industrial kiln, without reducing the temperature in the kiln. The present invention relates to a heat insulating device for securing a work area.

[0002]

2. Description of the Related Art Heating equipment, such as heating furnaces, soaking furnaces, heat treatment furnaces and flue gases (hereinafter referred to as kilns) installed in various industrial fields such as the steel industry have fixed refractory as a heat insulating material. A heat insulating material such as a material, an amorphous refractory or a ceramic fiber is lined on the inner surface of the furnace or the flue. However, these thermal insulators cannot prevent partial damage during use with any lining material.

[0003] Conventionally, when repairing or inspecting an important part of a furnace where a heat insulating material is damaged, heating of the furnace is stopped and the temperature of the entire furnace is reduced to a temperature at which an operator can work in the furnace. After the temperature has fallen and the kilns have been repaired and inspected,
So-called cold repair, in which the inside of the furnace was heated again to the operating temperature, was being implemented.

The above-mentioned method of repairing or inspecting a kiln has the following problems because the furnace is stopped for repair or inspection, and the entire furnace is cooled down to a temperature at which a worker can work in the furnace. . (1). Reducing the temperature inside the furnace releases the heat stored in the operating furnace and reheating it is a huge energy loss. (2). It takes a long time to cool the entire furnace and reheat it to the operating temperature after repair or inspection is completed, and the operating loss during this time is large. (3). The materials that make up the kiln are subject to significant thermal expansion and contraction stresses due to the temperature difference between the operating temperature and the temperature at which workers can work, thus shortening the life of the entire material that makes up the kiln. .

[0005] As a method for solving the above-mentioned disadvantages, there is a method in which a repair or inspection area is cut off with a heat insulating plate, and other parts are hotly repaired or inspected while heating, for example, a hot blast stove outlet tube section or a furnace wall. A heat shield is provided in the horizontal direction of the combustion chamber by opening the dome brick and the temporary combustion burner for protecting the brick of the heat storage chamber in the upper combustion chamber of the heat shield, while the lower combustion chamber of the heat shield is forcibly disposed. Cooling and hot-transferring the ceramic burner (Japanese Patent Laid-Open No. 52-29404);
There has been proposed a heat-insulating device for a hot-blast stove comprising a heat-insulating plate having an opening in the center and a support mechanism for vertically supporting the heat-insulating plate (Japanese Patent Publication No. 54-26964).

[0006]

Problems to be Solved by the Invention
No. 404, Japanese Patent Publication No. 54-26964 discloses a method in which a repair part and a non-repair part are cut off with a heat-insulating plate, and a temporary combustion burner is arranged in the non-repair part, and the repair part is heated. Although hot repair is performed by forced cooling, it has the drawback that not only it takes time until the heat shield is installed, but also that a considerably large opening needs to be provided for carrying the heat shield.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a heat insulating device which can be easily carried in from a small opening, can be easily opened, and has an excellent heat insulating effect.

[0008]

Means for Solving the Problems The present inventors have conducted various tests and studies to achieve the above object. As a result, if a fire-resistant fiber woven fabric coated with silicone resin on one side is sewn into a bag with the silicone resin side facing inside, it can be folded small and placed in a furnace that requires repair and inspection of the kiln. Investigating that it is possible to minimize the number of loading holes of the furnace and to supply air to the bag after inflation into the furnace and inflate it to cut off the area requiring repair and inspection from the heat inside the furnace. The invention has been reached.

That is, the invention of claim 1 of the present application is to sew a fire-resistant fiber woven fabric coated with a silicone resin on one side into a bag with the silicone resin-coated surfaces inside each other, and to inflate the bag by ventilation and blowing. This is a heat insulating device for hot repair of an industrial kiln characterized by using a shielding wall.

According to a second aspect of the present invention, a hot repair of an industrial kiln according to the first aspect, wherein two or more refractory fiber woven fabrics coated with a silicone resin on one side are sewn into a bag. Heat insulation device.

According to a third aspect of the present invention, there is provided the industrial kiln according to the first aspect, wherein the refractory fiber woven fabric and the refractory fiber woven fabric coated with a silicone resin on one surface are sewn into a bag. It is a heat protection device for hot repair.

According to a fourth aspect of the present invention, when the bag is sewn, sewn in a lattice or spiral shape to form a connected small bag assembly. Is a heat insulation device for hot repair of industrial kilns.

According to a fifth aspect of the present invention, an air supply port for supplying air to a sewn bag is connected to the sewn bag. It is.

The invention according to claim 6 of the present application is characterized in that an air supply port for supplying air to the sewn bag and an air discharge port for discharging air filled in the bag are connected. 4. A heat repair device for hot repair of an industrial kiln according to 4.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIG. FIG. 6 (a) is a cross-sectional view of the heat shielding structure sewn on the bag of claim 1, and FIG. 6 (b) is a laminate of two refractory fiber woven fabrics coated with a silicone resin on one side of claim 2. (C) is a cross-sectional view of a state in which the fire-resistant fiber woven fabric of claim 3 and a fire-resistant fiber woven cloth coated with a silicone resin on one surface are overlaid, and (d) is a cross-sectional view of the bag of claim 4. FIG. 9 is a cross-sectional view of a state in which a pouch aggregate is formed by performing sewing processing in a lattice or spiral shape when performing sewing processing.

In FIG. 6 (a), reference numeral 61 denotes a fire-resistant fiber woven fabric, and 62 denotes a silicone resin applied to one surface of the fire-resistant fiber woven fabric 61. It can be made into a bag shape, and can be made into a heat shielding wall if it is blown and blown into the bag. On the inside
The applied silicone resin 62 serves to suppress air leakage from the texture of the fire-resistant fiber woven fabric 61 and to inflate the bag.

In FIG. 6 (b), two refractory fiber woven fabrics 61 each having a silicone resin 62 applied to one side thereof are superimposed on each other, and the upper and lower surfaces of the base and the base are set with the silicone resin applied surfaces on the inner side. The periphery is sewn to form a bag, and the upper ground and the base are formed of two or more sheets, whereby leakage of air from the texture of the fire-resistant fiber woven fabric 61 can be further reduced.

In FIG. 6 (c), a fire-resistant fiber woven fabric 61 and a fire-resistant fiber woven fabric 61 coated with a silicone resin 62 on one surface are superposed, and the silicone resin application surfaces are placed on the inner surface side. By sewing the upper layer and the base layer into a bag shape, the contacting high-heat wall surface is effective when the temperature is higher, preventing burning of the bag and preventing air from the texture of the fire-resistant fiber woven fabric 61. Leakage can be further reduced.

In FIG. 6 (d), when the fire-resistant fiber woven fabric 61 coated with the silicone resin 62 on one side is sewn around the periphery with the silicone resin coated surfaces on the inner side, the bag is shaped like a bag. By sewn in a lattice or spiral shape and forming an aggregate of communicating cylindrical bags 63, even if it is inflated with air in a large bag shape, it becomes spherical when inflated with air, It becomes possible to shield in a shape.

The above-mentioned heat shielding structure is inserted into the furnace from a furnace wall insertion hole which is folded small and perforated to a minimum, and a predetermined region is shielded from the furnace temperature by introducing compressed air to expand the furnace. can do. The repair or inspection area space thus secured can be brought into a workable state by blowing cool air.

In the present invention, since the silicone resin applied to one side of the fire-resistant fiber woven fabric is usually burned off at 200 to 250 ° C., a part of the air introduced into the bag is allowed to flow to allow the air to flow through the bag. The temperature in the bag by 200
When the temperature is maintained at not more than ° C., the silicone resin applied to the inner surface of the bag can be prevented from burning out. Although it depends on the size and the like, the device does not need to have an air outlet when it is considered that there is much leakage of the air introduced into the bag.

As the refractory fiber woven fabric used in the present invention, a ceramic fiber woven fabric comprising one or more components such as silica, alumina and magnesia, a rock wool woven fabric, a slag wool woven fabric and the like can be used. .

The heat shield structure of the present invention can limit the area of the industrial kiln requiring repair or inspection, and can temporarily shut off the heat in the furnace to secure a working environment. Thermal damage to other parts of the furnace material can be minimized, and downtime for repairs and inspections can be minimized. The life can be extended.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a heat insulating device according to the present invention will be described below with reference to FIGS. FIG. 1 is a front view of the heat insulating dome of the present invention in an open state of the heat insulating dome, and FIG.
1A is a cross-sectional view taken along the line AA of FIG. 1 and shows a donut ring portion on the outer peripheral portion of the heat insulating dome. FIG. 1A is a cross-sectional view before the outer peripheral portion is expanded, FIG. FIG. 3 shows B in FIG.
FIGS. 4A and 4B are cross-sectional views of the heat insulating dome of the present invention, wherein FIG. 4A and FIG. set flue indicates the status using the damper chamber and at the damper repair, FIG. 4 is a perspective view showing the situation before insertion attached to the carrying-support bar into the flue folded small insulation dome, 5
Shows the situation where the heat-insulated dome was transported to the upstream side of the flue damper room to repair it, and the heat-insulated dome was expanded and installed by blowing air. (A) is a vertical sectional view of the flue, and (b) is a diagram. It is a flue horizontal sectional view.

In FIG. 1 to FIG. 5, reference numeral 1 denotes a folding type heat insulating dome, and a partition portion is sewn so that a surface portion becomes an aggregate of columnar bags when inflated. The heat insulating dome 1 uses a silica woven fabric coated with a silicone resin 4 on the inner surface of both the upper cloth 2 and the lower cloth 3, and a woven silica cloth 6 coated with the silicone resin 4 on the inner surface of the dome outer peripheral portion 5. ing. The heat insulating dome 1 is sewn with a thread 7 made of heat insulating fiber, a ceramic fiber woven fabric 8 is sewn on the upper cloth 2 and the outer peripheral portion 5, and a ceramic tape 9 is stuck on the seam portion to provide a heat insulating effect. And the life of the seam is extended. The air introduction part into the columnar bag of the heat insulating dome 1 is introduced by air from the air introduction port 10,
The outer peripheral part 5 and each inner surface part chamber are configured to communicate with each other through a vent hole 11. Reference numeral 12 denotes an exhaust valve for circulating the air in the heat insulating dome 1. Reference numeral 13 denotes a support rod for carrying the heat insulating dome 1 into the flue furnace.

Using the heat insulating dome 1, the furnace pressure adjusting damper 14 and the damper chamber brick 1 of the coke oven
In the case of repairing the coke oven 5, after stopping the combustion in the coke oven, the manhole 16 of the collecting flue is opened, the heat insulating dome 1 is folded, attached to one end of the support rod 13, and the balance weight 17 is attached to the other end. The heat insulating dome 1 is carried into the collecting flue from the manhole 16 of the collecting flue using a hoist or the like. Thereafter, the support rod 13 of the heat insulating dome 1 is set at a predetermined position, and then air is supplied from an air hose connected to the air inlet 10 to blow the air to the outer peripheral portion 5 of the heat insulating dome 1 to communicate with the outer peripheral portion 5. Vent hole 11
The air flows into the inner surface of each chamber from above, the heat insulating dome 1 expands, and the outer peripheral portion 5 is brought into close contact with the brick wall 18, thereby shutting off the upstream side and the downstream side of the collecting flue. Further, in order to prevent the silicone resin 4 applied on the inner surface of the heat insulating dome 1 from burning out, the exhaust valve 12 is opened to have a constant flow rate.

As a result, the upstream chamber 19 and the downstream furnace pressure adjusting damper chamber 20 of the stack flue are thermally completely shut off. Next, the outside air is blown to the downstream side by the cooling fan from the manhole 16 of the collecting flue and exhausted from the chimney 21, thereby forcibly cooling the furnace pressure adjusting damper chamber 20. After the forced cooling is completed, the furnace pressure adjustment damper 1
4 and the damper room brick 15 are repaired.

When the repair of the furnace pressure adjusting damper 14 and the damper room brick 15 is completed, the air supply to the heat insulating dome 1 is stopped, and then the air in the heat insulating dome 1 is discharged, and the dome support rod 13 is rotated. After winding the heat insulating dome 1 around the dome support rod 13, the heat insulating dome 1 and the dome support rod 1
The whole 3 is unloaded from the manhole 16. When the removal of the heat insulating dome 1 is completed, the manhole 16 is closed and the repair is completed. Although the inside of the manhole 16 is normally sealed with a refractory, the refractory of the manhole 16 is disassembled and opened only when the furnace pressure adjusting damper 14 and the damper room brick 15 are repaired. This open manhole 1
The heat insulation device is inserted from 6 and when the furnace repair is completed, the heat insulation device is carried out. Thereafter, the inside of the manhole 16 is sealed again with the refractory material, and the normal operation state is restored.

[0029]

As described above, with the use of the heat insulating device of the present invention, the space required for workers to work inside the furnace for repair or inspection of important parts without stopping the entire furnace is required. The time required to reheat the kiln and restore the operating temperature can be shortened, operating losses can be reduced, and the release of heat held by the operating furnace can be minimized. The energy for reheating the kiln to the operating temperature can be reduced. Further, the heat insulating device of the present invention can be carried into the furnace from a small opening, can be easily widened widely in the furnace, and has a large heat insulating effect due to heat insulation by an air layer, and can be taken out from the small opening. Easy to do. Furthermore, when the heat insulating device of the present invention is used, the range in which the material constituting the kiln is subjected to the stress of thermal expansion and contraction is limited to the minimum of the repaired portion, and the life of the furnace material constituting the kiln is extended. Can be extended.

[Brief description of the drawings]

FIG. 1 is a front view of a heat insulation device of the present invention in an open state of a heat insulating dome.

FIGS. 2A and 2B are cross-sectional views taken along the line AA of FIG. 1, showing the outer peripheral portion of the heat insulating dome. FIG. 2A is a cross-sectional view before the outer peripheral portion is expanded, and FIG. .

FIGS. 3A and 3B show a heat insulating dome in a cross-sectional view taken along a line BB in FIG. 1, wherein FIG. 3A is a cross-sectional view before expansion and FIG. 3B is a cross-sectional view after expansion.

FIG. 4 is a perspective view showing a state before insertion, in which the heat insulating dome is folded into a small size and set in a device to be carried into a furnace.

FIGS. 5A and 5B show a state in which an insulating dome is installed by being expanded upstream of a collective flue furnace internal pressure adjustment damper chamber for repairing, and FIG. 5A is a longitudinal sectional view, and FIG. It is.

FIG. 6 shows the structure of the heat insulation device of the present invention.
(A) is a cross-sectional view of the heat shielding structure sewn on the bag of claim 1, and (b) is a cross-sectional view of a state in which two fire-resistant fiber woven fabrics coated with a silicone resin on one side of claim 2 are stacked. Figure, (c)
The figure is a cross-sectional view of a state in which the fire-resistant fiber woven fabric of claim 3 and a fire-resistant fiber woven fabric coated with a silicone resin on one side are overlaid, (d).
The figure is a cross-sectional view showing a state in which a cylindrical bag assembly which is sewn in a lattice or spiral shape and communicated is formed when the bag is sewn.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated dome 2 Upper cloth 3 Lower cloth 4, 62 Silicone resin 5 Circumference 6 Silica woven cloth 7 Thread 8 Ceramic fiber woven cloth 9 Ceramic tape 10 Air inlet 11 Vent 12 Exhaust valve 13 Dome support rod 14 Furnace pressure adjustment Damper 15 Damper room brick 16 Manhole 17 Balance weight 18 Brick wall 19 Upstream chamber of collecting flue 20 Furnace pressure adjustment damper room 21 Chimney 61 Fire-resistant fiber woven fabric 63 Cylindrical bag

Continued on the front page (72) Inventor Hiroshi Yamazaki 1850 Minato, Wakayama-shi, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (72) Inventor Tomihiro Takahashi 3-2-2 Honohara, Toyokawa-shi, Aichi Iso-light Industry Co., Ltd. Toyokawa Plant (72) Inventor Yasuyuki Hayashi 7 Ogiha, Owa-cho, Hoei-gun, Aichi Prefecture, Ogiwa Plant, Ceramic Fiber Division, Isolite Industry Co., Ltd. (56) References JP-A-8-60214 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F27D 1/16 F27D 23/00 C21B 9/06, 9/10 D03D 15/02

Claims (6)

(57) [Claims] 1. A fire-resistant fiber woven fabric coated with silicone resin on one side is sewn into a bag with the silicone resin-coated surfaces facing each other, and the bag is ventilated and expanded to form a heat shielding wall. Heat insulation device for hot repair of industrial kilns. 2. The heat insulation device for hot repair of an industrial kiln according to claim 1, wherein two or more refractory fiber woven fabrics coated with a silicone resin on one side are sewn into a bag. 3. The heat insulation device for hot repair of an industrial kiln according to claim 1, wherein the woven fabric of refractory fiber and the woven fabric of refractory fiber coated with silicone resin on one side are overlapped and sewn into a bag. . 4. The heat of an industrial kiln according to claim 1, wherein, when the bags are sewn, the bags are sewn in a lattice or spiral shape to form a communicating small bag assembly. Heat insulation device for repair. 5. The heat insulation device for hot repair of an industrial kiln according to claim 1, wherein an air supply port for supplying air is connected to the sewn bag. 6. An industrial kiln according to claim 1, wherein an air supply port for supplying air to the sewn bag and an air discharge port for discharging air filled in the bag are connected. Heat repair equipment for hot repair.