JP2746067B2 - Heat insulation device for blast furnace hot stove repair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating device which can be easily installed from an upper manhole without lowering the temperature of a combustion chamber when repairing a ceramic burner in a hot blast furnace of a blast furnace.

[0002]

2. Description of the Related Art A hot blast stove is a regenerative heat exchanger for heating air sent to a blast furnace. As shown in FIG. 7, the hot blast stove comprises a combustion chamber 31, a heat storage chamber 32, and a cooling / cooling chamber 33. Are alternately repeated. Normally, three to four blast furnaces are installed for one blast furnace.
4. In general, a mixed gas of coke oven gas and blast furnace gas and combustion air 35 are mixed and burned. A device for mixing and burning the fuel gas 34 and the combustion air 35 is referred to as a ceramic burner 36. The ceramic burner of a hot blast stove becomes hot due to the intrusion of hot air at 950 to 1200 ° C and the radiation of heat from the combustion chamber when blowing air. However, the combustion gas and room temperature combustion air flow during combustion, so the ceramic burner refractory. Is subject to thermal shock. For this reason, as the refractory of the ceramic burner, a high alumina brick which is resistant to thermal shock is used.

In recent years, the life of blast furnaces has been extended,
Damage to ceramic burners in hot blast stoves by sulfur compounds has become significant. Damage of ceramic burners due to sulfur compounds is caused by hydrogen sulfide (H ₂ S) in fuel gas of 50-
It reacts with water (H ₂ O) at an ambient temperature of 400 ° C. and changes into sulfuric acid (H ₂ SO ₄ ), eroding and fragile aluminum oxide (Al ₂ O ₃ ) in high alumina bricks. Or,
Exhaust gas containing sulfur oxides generated by burning the sulfur content in the fuel gas flows back to the ceramic burner side when blowing, combines with water, condenses at the acid dew point, and corrodes the gas passage of the ceramic burner. It is considered.

Conventionally, as a method of repairing a ceramic burner of a hot blast stove, a method of repairing both a combustion chamber and a heat storage chamber after cooling to room temperature, and a method of hot-transferring a ceramic burner (Japanese Patent Application Laid-Open No. 52-29404) ), And a heat-insulating device (JP-B-54-26964) having a support mechanism for vertically supporting a heat-insulating plate having an opening in the center.

[0005]

In order to cool and repair both the combustion chamber and the heat storage chamber to room temperature, it is necessary to completely cool, repair, and raise the temperature, and it takes at least three months to repair.
In addition, the method of hot-reloading a ceramic burner disclosed in Japanese Patent Application Laid-Open No. 52-29404 is based on a method in which the ventilation of a hot blast stove is stopped to provide a heat insulating plate above the ceramic burner,
It takes about 40 days to install a hot-air stove burner and to cool and reload the ceramic burner. Therefore, the method disclosed in JP-A-52-29404 can be used only when the number of hot blast stoves has a margin. Furthermore, the heat insulation device disclosed in Japanese Patent Publication No. 54-26964 needs to cool the ambient temperature to 200 ° C. or less in order to install the heat insulation plate, and is dangerous because the heat insulation plate is assembled at the lower part of the combustion chamber. In order to complete the installation of the heat shield, it is necessary at least five days after the combustion is stopped.

An object of the present invention is to provide a heat insulating device which does not need to be assembled in a combustion chamber of a hot stove, can be easily inserted and installed from a manhole, and has an excellent heat insulating effect.

[0007]

Means for Solving the Problems The present inventors have conducted various tests and studies to achieve the above object. As a result, paying attention to the fact that the manhole is provided directly above the ceramic burner of the blast furnace hot stove, an openable parasol-type heat shield plate is inserted from the manhole to the lower part of the combustion chamber to be erected inside, and then the heat shield plate is formed. by allowed to contact the heat insulating board tip to the combustion chamber bottom peripheral wall open, it can be completely shut off the combustion chamber upper and lower ceramic burner, also heat insulating board bags
It has been confirmed that the heat insulating sheet is made of a heat-insulating sheet to improve the heat insulating property by enclosing air therein, and the present invention has been achieved.

[0008] That is, the present invention relates to a heat insulating device used for hot repair of a ceramic burner of a blast furnace hot air stove, to which an air hose capable of sealing air is connected.
An open / close type parasol-type heat insulating plate made of a bag-shaped heat insulating sheet and a support mechanism for freely opening, closing, inverting, and moving the parasol-type heat insulating plate when the blast furnace hot air stove is repaired.

[0009]

According to the heat insulating device of the present invention, a bag-shaped heat insulating sheet to which an air hose capable of sealing air is connected is connected.
And openable parasol type heat insulating board comprising, opening and closing of the umbrella-type heat insulating board, inverted, moving consists of a support mechanism for supporting freely, upon ceramic burner repair of hot blast furnace, opening the manhole directly above the ceramic burner, By operating the support mechanism, the parasol-type heat insulating plate consisting of a bag-shaped heat insulating sheet to which the air hose is connected is raised from the manhole into the lower part of the combustion chamber while being raised and moved to the center, and then the heat insulating plate is moved. Open to make the end of the heat shield plate adhere to the lower peripheral wall of the combustion chamber. Air is sealed inside the bag-shaped heat insulation sheet of the heat shield through an air hose to improve heat insulation, and to adhere to the lower peripheral wall of the combustion chamber. Is improved, the installation of the heat insulating device is completed. By installing the heat shield, the upper part of the combustion chamber and the lower ceramic burner are completely shut off.

Then, after the manhole opening is shielded with a thin steel plate or the like, the combustion blower is activated to blow air from the air side of the ceramic burner and discharge it from the gas side, thereby forcibly cooling the ceramic burner. After the forced cooling is completed, the manhole is opened and the ceramic burner is repaired.

The openable and closed parasol-type heat insulating plate of the heat insulating device according to the present invention is sewn to the inside of the ceramic fiber cloth with metal fibers sewn with metal fibers to be supported on the tip of the support pipe so as to be inverted. An air hose is provided in the bag-like heat insulating sheet of the product so that air for heat insulation can be enclosed therein. The parasol-type heat-insulating plate is turned upside down via a wire by a winch provided in the support mechanism, and stands up. The parasol-type heat shield plate is opened and closed by connecting a bush movably fitted to the support shaft and a heat insulating sheet support beam by a metal fitting, and sliding the bush along the support shaft by a winch via a wire.

[0012]

【Example】

Embodiment 1 Hereinafter, details of a heat insulating device of the present invention will be described with reference to FIGS. 1 to 4 showing an embodiment. 1A and 1B show a parasol-type heat shield plate of the openable type according to the present invention, wherein FIG. 1A is a bottom view in a closed state, FIG. 1B is a bottom view in an open state, and FIG. FIG. 3 is a side sectional view showing a state of insertion of a parasol-type heat insulating plate into a lower portion of a combustion chamber,
FIG. 4 is an explanatory diagram of an opening / closing mechanism of a parasol-type heat insulating plate. 1 to 4, reference numeral 1 denotes a parasol-type heat-insulating plate which can be opened and closed, and 2 denotes a support mechanism for freely opening, closing, inverting, and moving the parasol-type heat-insulating plate 1. A support box 3 also serving as a balance weight and the support box. 3, a support pipe 4 penetrating through the inside 3, an insertion roll 5, and winches 6, 7. The drive of the insertion roll 5 causes the support pipe 4 to advance and retreat.

At the tip of the support pipe 4, a support shaft 8 of the parasol-type heat insulating plate 1 is pivotally mounted so as to be capable of being inverted.
Is pulled by the winch 6 to raise the support shaft 8. Reference numeral 10 denotes a number of heat insulating sheet support beams pivotally attached to the periphery of the distal end of the support shaft 8 so as to be freely opened and closed.
2, the wire 13 connected to the bush 11 is connected to the winch 7 via the roll 14 at the tip of the support shaft 8, and by pulling the wire 13 with the winch 7, the bush 11 moves in the tip direction along the support shaft 8. Then, each of the heat insulating sheet support beams 10 is moved to the support shaft 8 via the connection fitting 12.
Is configured to open with the periphery of the tip as a fulcrum. A parasol-type heat - insulating sheet is formed on each of the above-mentioned heat-insulating sheet support beams 10 by a bag-like heat insulating sheet 15 made of ceramic fiber cloth sewn with metal fibers to keep the inner surface airtight.
Plate 1 is attached to the bag-like insulation sheet 15, air hose 16 is connected, and is configured to be able to enclose the air inside the bag-like <br/> insulation sheet 15 through the air hose 16. Reference numeral 17 denotes a combustion chamber of a hot blast stove, 18 denotes a ceramic burner portion, and 19 denotes a manhole immediately above the ceramic burner portion 18.

When the ceramic burner section 18 of the hot blast stove is to be repaired by the above configuration, after stopping the combustion, the manhole 19 immediately above the ceramic burner section 18 is opened, and the support mechanism 2 is connected to the manhole 19. The support roller 8 is advanced by driving the insertion roll 5 to move the parasol-type heat shield 1 into the combustion chamber 17 of the hot air stove.
By operating the winch 6 and pulling the wire 9 while inserting it into the lower part of the lower part, the support shaft 8 is vertically erected, and the parasol-type heat shield plate 1 is positioned at the center of the lower part of the combustion chamber 17. Thereafter, the winch 7 is operated to pull the wire 13 to raise the bush 11 along the support shaft 8, and each of the heat insulating sheet support beams 10 is used as a fulcrum around the front end of the support shaft 8 to cut off the bag. The sheet 15 is opened until the leading end of the sheet 15 comes into close contact with the lower peripheral wall of the combustion chamber 17. Then, the air hose 1 is placed in the bag-shaped heat insulating sheet 15.
Air is blown in through 6 to inflate the bag-like heat insulating sheet 15 to improve the heat insulating property, to improve the adhesion to the peripheral wall surface below the combustion chamber 17, and to complete the installation of the heat insulating device. The air pressure in the bag-shaped heat insulating sheet 15 is
To keep it constant.

Thus, the upper portion of the combustion chamber 17 and the lower ceramic burner portion 18 are completely shut off. After a while
After sealing the opening of the manhole 19 with a thin steel plate or the like,
A combustion blower (not shown) is started to blow air, and is discharged from the gas side to perform forced cooling. When the forced cooling is completed, the thin steel plate or the like attached to the opening of the manhole 19 is removed to open the manhole 19 and the ceramic burner 18
Perform repairs. When the repair of the ceramic burner portion 18 is completed, the winch 7 is operated to loosen the wire 13 and the bush 11 is lowered along the support shaft 8, and each of the heat insulating sheet support beams 10 is supported around the tip of the support shaft 8 as a fulcrum. close. Next, while operating the winch 6 to loosen the wire 9, the insertion roll 5 is driven to retract the support pipe 8, the support shaft 8 is turned over, and pulled out from the manhole 19.
The manhole 19 is closed to complete the removal of the heat shield.

Embodiment 2 As shown in FIG. 5, the manhole 19 immediately above the ceramic burner 18 was opened while adjusting the draft pressure on the side of a chimney (not shown). At that time, the temperature in the combustion chamber 17 is 10
00 ° C. It took 4 hours from the opening of the manhole 19 to the insertion of the heat insulation device described in Example 1 to the completion of the installation.
Next, a combustion blower (not shown) was started and air at 40 ° C. was blown for 20 hours, and the air was discharged from the gas side to forcibly cool the ceramic burner 18. During this period, the temperature changes of three places a to c of the ceramic burner 18 and the wall e of the combustion chamber 17 were measured. FIG. 6 shows the result.

As shown in FIG. 6, the ceramic burner 1
The brick temperatures of the upper surfaces a and c and the lower portion b of the ceramic burner portion 18 became 50 ° C. or less, which was a temperature sufficient for performing the repair work. In addition, the wall surface e above the parasol-type heat insulating plate 1
Is about 100 ° C., and the umbrella-type heat insulating plate 1
It was confirmed that the heat insulation effect of was sufficient. The repair of the ceramic burner section 18 was completed, and the total air cutoff time until the heat shield was removed was completed in 60 hours.

[0018]

As described above, the heat insulating device of the present invention can be easily inserted and installed from a manhole, has an excellent heat insulating effect, and performs hot repair of a ceramic burner portion of a hot blast stove as compared with the prior art. It can be performed in a short time, and can return to normal operation early.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an opening / closing type parasol-type heat shield plate of the present invention, wherein FIG. 1 (a) is a bottom view in a closed state, and FIG. 1 (b) is a bottom view in an open state. It is explanatory drawing of an opening / closing mechanism.

FIG. 2 is a diagram showing a connection state between a tip end of a support shaft and a heat insulating sheet support beam.

FIG. 3 is a side cross-sectional view showing a situation where a parasol-type heat shield plate is inserted into a lower portion of a combustion chamber.

FIG. 4 is an explanatory view of an opening / closing mechanism of a parasol-type heat insulating plate.

FIG. 5 is a side sectional view showing a temperature measurement position in Example 2.

FIG. 6 is a graph showing a relationship between an elapsed time after stopping combustion and an absolute temperature in Example 2.

FIG. 7 is a schematic explanatory view of a hot blast stove.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Parasol type heat insulation board 2 Support mechanism 3 Support box 4 Support pipe 5 Insert roll 6, 7 winch 8 Support shaft 9, 13 Wire 10 Heat insulation sheet support beam 11 Bush 12 Connection metal fitting 14 Roll 15 Bag-shaped heat insulation sheet 16 Air hose 17, 31 combustion chamber 18 ceramic burner section 19 manhole 20 pressure regulating valve 32 heat storage chamber 33 mixed cooling chamber 34 fuel gas 35 combustion air 36 ceramic burner

Claims (1)

(57) [Claims] 1. A heat insulating device used for hot repair of a ceramic burner of a blast furnace hot air stove, wherein a bag-shaped heat insulating sheet to which an air hose capable of freely enclosing air is connected.
A heat shield device for repairing a blast furnace hot air stove, comprising an openable / closed parasol-type heat-insulating plate composed of: and a support mechanism for freely opening, closing, inverting, and moving the parasol-type heat-insulating plate.