CN113718076A - Method for repairing hot air outlet of hot air furnace - Google Patents
Method for repairing hot air outlet of hot air furnace Download PDFInfo
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- CN113718076A CN113718076A CN202111100750.2A CN202111100750A CN113718076A CN 113718076 A CN113718076 A CN 113718076A CN 202111100750 A CN202111100750 A CN 202111100750A CN 113718076 A CN113718076 A CN 113718076A
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The application provides a method for repairing a hot air outlet of a hot air furnace, and belongs to the technical field of hot air furnace maintenance. The method for repairing the hot air outlet of the hot air furnace comprises the following steps: the method comprises the steps of arranging a draught fan on a manhole door at the lower part of a hot blast stove to enable the interior of the hot blast stove to be at negative pressure, taking down part or all of an upper semicircular pipe shell of a hot blast outlet of the hot blast stove and removing brittle bricks to form a notch, installing a casting mould on the notch, installing a first sealing shell on the upper side of the casting mould, and casting high-temperature-resistant materials into the casting mould. The repairing method for the hot air outlet of the hot air furnace can enable the position to be repaired of the hot air outlet of the hot air furnace to be repaired thoroughly, and repeated risks are avoided. The repair method is short in use time, can complete repair within 4-5 days generally, and has small influence on blast furnace production.
Description
Technical Field
The application relates to the technical field of hot blast stove maintenance, in particular to a method for repairing a hot blast outlet of a hot blast stove.
Background
The hot air outlet of the top combustion type hot air furnace is easy to cause overhigh temperature of a tube shell, the safe production is threatened, the adopted repairing mode is to stop the furnace, the repairing is carried out after the furnace is cooled, the consumed time is long, generally about 30 days, the influence on the production of the hot air furnace is large, and the loss is large.
Other repair schemes of the hot air outlet of the top combustion type hot air furnace are simple patching, and when a backpack is carried out at a high-temperature part, the method cannot address the root cause, high-temperature red explosion and development are easy to repeatedly occur, the backpack is larger when the backpack is carried, the controllability is poor, the air supply temperature is influenced for a long time, and the safe production cannot be guaranteed.
Disclosure of Invention
The application provides a method for repairing a hot air outlet of a hot air furnace, which can repair the hot air outlet of the hot air furnace in a short time and can keep the time after repair.
The embodiment of the application is realized as follows:
in a first aspect, the present application provides a method for repairing a hot air outlet of a hot air furnace, the bottom of the hot air furnace having a manhole door, comprising: the method comprises the steps of arranging a draught fan on a manhole door at the lower part of a hot blast stove to enable the interior of the hot blast stove to be at negative pressure, taking down part or all of an upper semicircular pipe shell of a hot blast outlet of the hot blast stove and removing brittle bricks to form a notch, installing a casting mould on the notch, installing a first sealing shell on the upper side of the casting mould, and casting high-temperature-resistant materials into the casting mould.
In the technical scheme, the method for repairing the hot air outlet of the hot air furnace is characterized in that the induced draft fan is arranged through the manhole door at the lower part of the hot air furnace, the inside of the hot air furnace is in a negative pressure state, hot air in the hot air furnace is not discharged from the hot air outlet at the moment, and outside air enters the inside of the hot air furnace from the hot air outlet of the hot air furnace, so that the temperature of the hot air outlet of the hot air furnace is reduced. And when the temperature of the hot air outlet of the hot air furnace is reduced, constructing the position to be repaired. Firstly, cutting off a pipe shell at a position to be repaired, removing the brittle brick to form a gap, installing a casting mold at the gap, and casting a high-temperature-resistant material in the casting mold, so that the position to be repaired of a hot air outlet of the hot air furnace is thoroughly repaired without repeated risks. The repairing method for the hot air outlet of the hot air furnace is short in time, generally can complete repairing within 4-5 days, and has small influence on production of the hot air furnace.
With reference to the first aspect, in a first possible example of the first aspect of the present application, before the casting mold is installed in the notch, the casting mold is fixedly connected to the supporting column, and when the casting mold is installed in the notch, the bottom end of the supporting column abuts against the inner bottom surface of the hot air outlet of the hot air furnace.
In the above example, the support pillar is fixedly connected with the casting mold, and the bottom end of the support pillar abuts against the inner bottom surface of the hot air outlet of the hot air furnace to support the casting mold and assist other fixing to enable the casting mold to bear weight.
With reference to the first aspect, in a second possible example of the first aspect of the present application, after the refractory is coagulated into the refractory filling structure, the first sealed shell is removed, and a thermal insulation material is laid on the surface of the refractory filling structure, and then the second sealed shell is installed.
In the above example, the refractory material has a high thermal conductivity, and the heat insulating material laid on the surface of the refractory filling structure formed of the refractory material can prevent the temperature of the treatment site from becoming too high after the recovery production.
With reference to the first aspect, in a third possible example of the first aspect of the present application, before the second capsule is installed, the anchor pins are welded to the inner surface of the second capsule and coated with a layer of refractory material.
With reference to the first aspect, in a fourth possible example of the first aspect of the present application, the first seal housing is a removed circular tube housing.
In the above example, the new sealing shell is difficult to match with the casting mold due to the matching degree problem, and when the high-temperature-resistant material is cast, the previously taken-off circular tube shell and the casting mold are firstly adopted to form a cavity in a composite mode to complete the casting work.
With reference to the first aspect, in a fifth possible example of the first aspect of the present application, before the first sealing shell is installed on the upper side of the casting mold, the first sealing shell is subjected to a grinding groove treatment.
In the above example, the circular tube shell taken down is ground to be beveled, so that the circular tube shell can be stuck into the gap for 20mm more and then welded back to the closing die.
In a sixth possible example of the first aspect of the present application, in combination with the first aspect, when pouring the refractory into the casting mold, the first refractory is poured into the bottom of the casting mold, and then the second refractory is poured, and the water content of the first refractory is higher than that of the second refractory.
In the above examples, the present application adopts a wet-then-dry method when pouring refractory materials, so as to form a compact seamless structure.
In a seventh possible example of the first aspect of the present application in combination with the first aspect, the first refractory and the second refractory are both refractory ceramic materials.
With reference to the first aspect, in an eighth possible example of the first aspect of the present application, after pouring the refractory into the pouring mold for 5 to 10 days, a grouting process is performed between the circular tube shell and the refractory filling structure formed by the refractory.
In the above example, the grouting treatment can fill the pores after the refractory is solidified, thereby further reinforcing and repairing the pores.
In a ninth possible example of the first aspect of the present application in combination with the first aspect, before pouring the refractory into the above-mentioned pouring mold, the gap between the pouring mold and the bottom of the unremoved brick is filled with an insulating material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a hot blast stove according to an embodiment of the present application;
fig. 2 is a sectional view of the hot air outlet of the hot air furnace repaired according to the embodiment of the application.
Icon: 10-hot blast stove; 11-a hot air outlet; 100-round tube shells; 210-casting a mold; 220-support column; 230-reinforcing steel bars; 240-steel plate; 300-high temperature resistant filling structure; 400-an insulating material; 500-anchor nails.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The upper semicircle of the hot air outlet of the existing hot air furnace is easy to burst and fall off due to the extrusion of the lining, so that the hot air outlet of the hot air furnace is blown by wind, a tube shell turns red, a welding seam bursts and leaks to cause the forced shutdown of the hot air furnace, and the blast furnace is affected by the use of the blast temperature and threatens the production safety.
The hot air outlet of the hot air furnace is positioned at the upper part of the hot air furnace, the opening of the hot air furnace is transversely arranged, and the bottom of the hot air furnace is provided with a manhole.
The following description is specifically made for a method for repairing a hot air outlet of a hot air furnace in the embodiment of the present application:
referring to fig. 1 and 2, a method for repairing a hot air outlet of a hot air furnace according to the present application includes: a draught fan is arranged on a manhole door (not shown) at the lower part of the hot blast stove, so that the inside of the hot blast stove 10 is in negative pressure, a round pipe shell 100 of a semi-circle part or a whole upper semi-circle part of a shell of a hot blast outlet 11 of the hot blast stove 10 is taken down, a brittle brick is removed to form a notch, a casting mold 210 is installed at the notch, a first sealing shell is installed on the upper side of the casting mold 210, and high-temperature-resistant materials are cast into the casting mold 210.
This application sets up the draught fan through the manhole door in the hot-blast furnace lower part, makes the hot-blast furnace 10 inside be in the negative pressure state, and hot-blast furnace 10 inhales outside hole through hot air outlet 11. At this time, the hot air outlet 11 of the hot blast stove 10 is temporarily not used for discharging hot air, but for sucking air having a low external temperature, thereby lowering the temperature of the hot air outlet 11 of the hot blast stove 10. Under the condition of adding air with lower external temperature, workers can repair the upper half circle of the hot air outlet 11 of the hot air furnace 10 without waiting for the hot air outlet 11 to be cooled.
It should be noted that, the present application can also change the air intake rate of the external air at the hot air outlet 11 of the hot air furnace 10 and the reduction rate of the dome temperature by adjusting the power or the air volume of the induced draft fan disposed in the manhole door. Meanwhile, the temperature of the hot air outlet 11 of the hot air furnace 10 is adjusted by controlling the power or the air volume of the induced draft fan, so that a worker can bear and enter the upper semicircle of the hot air outlet 11 of the hot air furnace 10 for repairing. However, if the power or the air volume of the induced draft fan is too large, the temperature of the vault of the hot blast stove 10 is reduced too fast to be lower than the phase transition temperature (700 ℃) of silica bricks during the repair of the hot blast outlet 11 of the hot blast stove 10, so that the brickwork in the stove is damaged. Therefore, the power or the air quantity of the induced draft fan needs to be controlled, so that the temperature of the hot air outlet 11 of the hot air furnace 10 is lower than the temperature which can be born by workers, and the brickwork in the furnace is not damaged. When the power or the air volume of the draught fan are high and cannot be adjusted, the partition plate can be arranged at the installation position of the draught fan, and the overlarge wind power is prevented.
In addition, when the temperature of the induced draft fan is too high, cooling water can be used for cooling, and a standby induced draft fan can be arranged to prevent the hot air outlet 11 of the hot air furnace 10 from rising again when the induced draft fan in the working state fails and cannot be used, so that the personnel doing repair work are harmed.
After the draught fan is used for enabling the inside of the hot blast stove 10 to be in negative pressure for a period of time, after the temperature of the position of a hot air outlet 11 of the hot blast stove 10 is detected to be lower than the temperature which can be born by a worker, the worker enters the hot air outlet 11 of the hot blast stove 10, cuts the round pipe shell 100 at the position to be repaired, takes out the brittle bricks in the cut round pipe shell 100, and enables the top of the hot air outlet 11 of the hot blast stove 10 to form a notch.
And an inner steel shuttering is arranged at the gap and comprises a casting mold 210, and the casting mold 210 is slightly smaller than the gap so that the casting mold 210 can be placed into the gap to fill the gap.
The casting mold 210 includes a bottom plate having a thickness of 30mm and a side plate having a thickness of 10 mm. And the casting mold 210 is welded to the uncut round pipe shell 100 through the edge of the bottom plate so that the casting mold 210 is stably connected to the hot air outlet 11 position of the hot air furnace 10.
Optionally, the inner form further comprises a support column 220.
One end of the supporting column 220 passes through the middle of the bottom plate of the casting mold 210, and the middle thereof is welded to the bottom plate. Before the pouring mold 210 is installed in the notch, the pouring mold 210 and the supporting column 220 are welded, and when the pouring mold 210 is installed in the notch, the bottom end of the supporting column 220 abuts against the inner bottom surface of the hot air outlet 11 of the hot air furnace 10, and the top end of the supporting column 220 abuts against the second sealing plate of the pouring mold 210 installed last.
The supporting column 220 of the inner steel supporting die abuts against the inner bottom surface of the hot air outlet 11 of the hot air furnace 10 through the bottom end to support the casting die 210, so that the casting die 210 can be stably connected to the hot air furnace 10.
Optionally, the inner form further comprises reinforcing steel bars 230.
One end of the reinforcing steel bar 230 is welded to the supporting column 220, and the other end is welded to the bottom plate of the casting mold. Before the reinforced steel bar 230 is installed in the notch, the bottom plate of the casting mold 210 is welded to the supporting column 220, and then the two ends of the reinforced steel bar 230 are welded to the bottom plate of the casting mold 210 and the supporting column 220, respectively.
In the embodiment shown in fig. 2, the inner form comprises two reinforcing bars 230. In other embodiments of the present application, the inner form may further include one, three, four, or more reinforcing bars 230.
After the installation of the casting mold 210 is completed, it is checked whether a gap exists between the casting mold 210 and the bottom of the unremoved brick, and if so, the gap may be filled with an insulation material 400.
A first sealing case is installed at an upper side of the casting mold 210.
The first sealed shell is a cut-off round bulb 100 or a steel plate 240.
Optionally, the first sealed housing is a cut-off round housing 100.
Before casting the refractory in the casting mold 210, the inventor finds that if a new steel plate 240 is used for mold matching, the new steel plate 240 is difficult to match with the casting mold 210 and the notch, and a long time is required for completing the mold matching process. In order to shorten the repair period as much as possible, the cut round pipe case 100 is sealed, the cut round pipe case 100 can be quickly matched with the casting mold 210 and the notch, and the cut round pipe case 100 is removed after the high-temperature resistant filling structure 300 is filled.
Optionally, the first sealed housing is beveled prior to installation of the cut round housing 100.
In the above example, the removed round tube case 100 is ground to be beveled to fit more than 20mm into the gap and then welded back to the closing die.
Optionally, when pouring the refractory into the casting mold 210, a first refractory is poured into the bottom of the casting mold 210, and then a second refractory is poured, where the water content of the first refractory is higher than that of the second refractory.
The method of firstly wetting and then drying is adopted when the high-temperature-resistant material is poured, so that the seamless and dense molding is realized.
The first high-temperature-resistant material and the second high-temperature-resistant material are both high-temperature-resistant ceramic materials.
It should be noted that the first refractory and the second refractory of the present application have the same composition and differ only in the water content.
After the refractory material is condensed into the refractory filling structure 300, the first sealing shell is removed, the thermal insulation material 400 is laid on the surface of the refractory filling structure 300, and then the second sealing shell is installed.
The heat conductivity coefficient of the high-temperature resistant material is high, and the heat insulation material 400 is laid on the surface of the high-temperature resistant filling structure 300 formed by the high-temperature resistant material, so that the temperature of the treatment part after recovery production can be prevented from being too high.
Optionally, the second sealed envelope is a steel plate 240 with a thickness of 16 m.
It should be noted that, the first sealed casing and the second sealed casing may both be made of the steel plate 240, and the time for using the solution is shorter compared to the solution in which the first sealed casing is the cut round pipe casing 100 and the second sealed casing is the steel plate 240.
The anchoring nail 500 is welded to the inner surface of the second sealed housing and coated with a layer of refractory material. Wherein the anchor studs 500 are disposed perpendicular to the inner surface of the second sealed housing.
And after the high-temperature-resistant material is poured for 5-10 days, grouting between the round pipe shell and a high-temperature-resistant filling structure formed by the high-temperature-resistant material, so that the pores formed after the high-temperature-resistant material is condensed are filled, and further reinforcement and repair are performed.
The method for repairing the hot air outlet of the hot blast stove is further described in detail with reference to the following examples.
Example 1
The embodiment of the application provides a method for repairing a hot air outlet of a hot air furnace, which comprises the following steps:
1. forming a negative pressure environment
A draught fan is arranged on a manhole door at the lower part of the hot blast stove 10, the draught fan is opened to form negative pressure in the hot blast stove 10, and the air quantity of the draught fan is controlled, so that the temperature of a hot air outlet 11 of the hot blast stove 10 is lower than the temperature which can be borne by workers, and the vault temperature of the hot blast stove 10 is higher than the phase transition temperature of silica bricks.
2. Installing inner support steel die
Outside the hot blast stove 10, one end of the supporting column 220 is firstly penetrated through the middle part of the bottom plate of the casting mold 210, the middle part of the supporting column is welded on the bottom plate, then the reinforcing steel bar 230 is taken, one end of the reinforcing steel bar 230 is welded on the middle part of the supporting column 220, and the other end of the reinforcing steel bar 230 is welded on the bottom plate of the casting mold 210, so that an inner steel form is formed.
When the inner steel formwork is installed, a pouring mold is placed under the gap, and the bottom end of the supporting column 220 abuts against the inner bottom surface of the hot air outlet 11 of the hot air furnace 10.
3. Pouring and aftertreatment
And filling a heat insulation material 400 in a gap between the casting mold 210 and the brick which is not taken out, polishing the groove of the taken-out circular tube shell 100, sticking the polished circular tube shell 100 into the gap of the casting mold 210 for 20mm, and welding the circular tube shell back to the mold. The first high-temperature-resistant material is poured into the pouring mold 210, the second high-temperature-resistant material is poured into the pouring mold 210, after the high-temperature-resistant material is solidified into the high-temperature-resistant filling structure 300, the round cartridge 100 is detached, and the heat-insulating material 400 is laid on the surface of the high-temperature-resistant filling structure 300.
The first high-temperature-resistant material is a high-temperature-resistant ceramic material with the water content of 8%, and the second high-temperature-resistant material is a high-temperature-resistant ceramic material with the water content of 7%.
4. Complete the repair
Taking a new steel plate 240, welding a plurality of anchoring nails 500 coated with refractory materials on the steel plate 240, and then welding the steel plate 240 fixed with the anchoring nails 500 on the surface of the casting mold 210 to complete mold closing. And after 7 days, performing grouting treatment between the circular tube shell and the high-temperature-resistant filling structure formed by the high-temperature-resistant materials to finish repairing the hot air outlet 11 of the hot air furnace 10.
Example 2
The embodiment of the application provides a method for repairing a hot air outlet of a hot air furnace, which comprises the following steps:
1. forming a negative pressure environment
A draught fan is arranged on a manhole door at the lower part of the hot blast stove 10, the draught fan is opened to form negative pressure in the hot blast stove 10, and the air quantity of the draught fan is controlled, so that the temperature of a hot air outlet 11 of the hot blast stove 10 is lower than the temperature which can be borne by workers, and the vault temperature of the hot blast stove 10 is higher than the phase transition temperature of silica bricks.
2. Installing inner support steel die
Outside the hot blast stove 10, one end of the supporting column 220 is firstly penetrated through the middle part of the bottom plate of the casting mold 210, the middle part of the supporting column is welded on the bottom plate, then the reinforcing steel bar 230 is taken, one end of the reinforcing steel bar 230 is welded on the middle part of the supporting column 220, and the other end of the reinforcing steel bar 230 is welded on the bottom plate of the casting mold 210, so that an inner steel form is formed.
When the inner steel formwork is installed, a pouring mold is placed under the gap, and the bottom end of the supporting column 220 abuts against the inner bottom surface of the hot air outlet 11 of the hot air furnace 10.
3. Pouring and aftertreatment
The gap between the casting mold 210 and the brick not taken out is filled with a heat insulating material 400, and a new steel plate 240 is taken out and welded back to the mold. The first high-temperature-resistant material is poured into the pouring mold 210, the second high-temperature-resistant material is poured into the pouring mold 210, after the high-temperature-resistant material is solidified into the high-temperature-resistant filling structure 300, the steel plate 240 is detached, and the heat-insulating material 400 is laid on the surface of the high-temperature-resistant filling structure 300.
The first high-temperature-resistant material is a high-temperature-resistant ceramic material with the water content of 8%, and the second high-temperature-resistant material is a high-temperature-resistant ceramic material with the water content of 7%.
4. Complete the repair
A plurality of refractory-coated anchor nails 500 are welded to the detached steel plate 240, and then the steel plate 240 to which the anchor nails 500 are fixed is welded to the surface of the casting mold 210, thereby completing the mold closing. And after 7 days, performing grouting treatment between the circular tube shell and the high-temperature-resistant filling structure formed by the high-temperature-resistant materials to finish repairing the hot air outlet 11 of the hot air furnace 10.
Test example 1
The repairing time of the embodiment 1-2 and the maintaining time of the hot air outlet 11 of the repaired hot air furnace 10 are counted, and are shown in table 1.
TABLE 1 repair duration and Retention duration for examples 1-2
| Item | Length of repair | Duration of hold |
| Example 1 | 120h | For at least 2 years |
| Example 2 | 136h | For at least 2 years |
From the above, the repair time of the embodiment 1 of the present application is shorter than that of the embodiment 2, that is, the die closing time of the cut round tube shell 100 is shorter when the high temperature resistant material is poured;
the duration of the maintenance of the hot air outlet 11 of the hot air furnace 10 repaired in the embodiment 1 and the embodiment 2 is longer than 2 years, which shows that the repairing method of the hot air outlet of the hot air furnace is thorough in repairing.
To sum up, the restoration method of hot-blast furnace hot air outlet of this application embodiment sets up the draught fan through the manhole door of present hot-blast furnace 10 earlier, and hot-blast furnace 10 is inside to be in the negative pressure state, and hot-blast among the hot-blast furnace 10 is no longer discharged from hot-blast outlet 11 this moment to outside air enters into inside hot-blast furnace 10 from hot-blast outlet 11 of hot-blast furnace 10, thereby reduces hot-blast furnace 10 hot-blast outlet 11's temperature. And when the temperature of the hot air outlet 11 of the hot air furnace 10 is reduced, constructing the position to be repaired. Firstly, cutting off a pipe shell at a position to be repaired, removing the brittle brick to form a gap, installing a casting mold 210 at the gap, and casting a high-temperature-resistant material in the casting mold 210, so that the position to be repaired of the hot air outlet 11 of the hot air furnace 10 is completely repaired without repeated risks. The repairing method for the hot air outlet of the hot air furnace is short in time, generally can complete repairing within 4-5 days, has small influence on the air temperature of the blast furnace, and ensures safe production.
The foregoing is illustrative of the present application and is not to be construed as limiting thereof, as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The repairing method of the hot air outlet of the hot air furnace is characterized by comprising the following steps: the hot blast stove is characterized in that a draught fan is arranged on the manhole door at the lower portion of the hot blast stove, so that the inside of the hot blast stove is under negative pressure, a part or all of a hot air outlet of the hot blast stove is taken down to form a semi-circular pipe shell, a brittle brick is removed to form a notch, a pouring mold is installed on the notch, a first sealing shell is installed on the upper side of the pouring mold, and high-temperature-resistant materials are poured into the pouring mold.
2. The method for repairing a hot air outlet of a hot air furnace according to claim 1, wherein the casting mold is fixedly connected to a support pillar before the casting mold is installed in the gap, and a bottom end of the support pillar abuts against an inner bottom surface of the hot air outlet of the hot air furnace when the casting mold is installed in the gap.
3. The method for repairing the hot air outlet of the hot air furnace as claimed in claim 1, wherein the first sealing shell is removed after the refractory is condensed into the refractory filling structure, and the surface of the refractory filling structure is paved with a heat insulating material, and then a second sealing shell is installed.
4. A method of repairing a hot air outlet of a hot air stove according to claim 3, wherein the second sealing shell is welded with anchoring studs and coated with a layer of refractory material on its inner surface before the second sealing shell is mounted.
5. The method of repairing a hot air outlet of a hot air furnace as claimed in claim 1, wherein said first sealed shell is a removed round tube shell.
6. The method for repairing the hot air outlet of the hot air furnace as claimed in claim 5, wherein the first sealing shell is subjected to a grinding groove treatment before the first sealing shell is installed on the upper side of the casting mold.
7. The method for repairing the hot air outlet of the hot air furnace according to claim 1, wherein when the refractory is poured into the casting mold, a first refractory is poured into the bottom of the casting mold, and then a second refractory is poured, wherein the water content of the first refractory is higher than that of the second refractory.
8. The method for repairing the hot air outlet of the hot air furnace as claimed in claim 7, wherein the first refractory and the second refractory are both refractory ceramic materials.
9. The method for repairing the hot air outlet of the hot air furnace according to any one of claims 1 to 8, wherein a grouting treatment is performed between the circular tube shell and the high-temperature-resistant filling structure formed by the high-temperature-resistant material after the high-temperature-resistant material is poured into the pouring mold for 5 to 10 days.
10. The method for repairing the hot air outlet of the hot air furnace according to any one of claims 1 to 8, wherein before the refractory is poured into the casting mold, a gap between the casting mold and the bottom of the brick which is not removed is filled with a heat insulating material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114774607A (en) * | 2022-04-24 | 2022-07-22 | 北京首钢建设集团有限公司 | Hot blast stove bottom structure and welding method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114774607A (en) * | 2022-04-24 | 2022-07-22 | 北京首钢建设集团有限公司 | Hot blast stove bottom structure and welding method thereof |
| CN114774607B (en) * | 2022-04-24 | 2023-09-15 | 北京首钢建设集团有限公司 | Furnace bottom structure of hot blast furnace and welding method thereof |
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| CN113718076B (en) | 2022-11-15 |
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