CN109825658B - Method for treating air leakage of hot blast stove bottom plate - Google Patents
Method for treating air leakage of hot blast stove bottom plate Download PDFInfo
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- CN109825658B CN109825658B CN201910151212.2A CN201910151212A CN109825658B CN 109825658 B CN109825658 B CN 109825658B CN 201910151212 A CN201910151212 A CN 201910151212A CN 109825658 B CN109825658 B CN 109825658B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- 238000003466 welding Methods 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims description 42
- 239000006260 foam Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 abstract description 15
- 230000002787 reinforcement Effects 0.000 description 9
- 239000011819 refractory material Substances 0.000 description 6
- 239000011449 brick Substances 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a method for treating air leakage of a hot blast stove bottom plate, which comprises the following steps: the method comprises the following steps: a plurality of first mounting grooves are formed in the top of a concrete foundation at the bottom of the hot blast stove; horizontally inserting a first steel plate into the first mounting groove; restoring the first reinforcing mesh in the first mounting groove, and restoring the mounting of the first foundation bolt and the outer frame at the bottom of the hot blast stove; pouring concrete in the first pouring space; step two: cutting off the concrete foundation between the first mounting grooves to form second mounting grooves; horizontally inserting a second steel plate into the second mounting groove; welding the parts of the first steel plate and the second steel plate which are respectively positioned at the outer side of the bottom of the hot blast stove, and respectively welding the first steel plate and the second steel plate with the periphery of the bottom of the hot blast stove; restoring the second reinforcing mesh in the second mounting groove and restoring the mounting of the second ground bolt and the outer frame at the bottom of the hot blast stove; and pouring concrete in the second pouring space. The construction can be completed in a short time, the construction period is short, and the cost is low.
Description
Technical Field
The invention relates to the field of equipment maintenance, in particular to a method for treating air leakage of a hot blast stove bottom plate.
Background
The hot blast stove is a large device for providing hot air for the ironmaking blast furnace, and each ironmaking blast furnace is generally provided with 3-4 hot blast stoves. The working state of the single-seat hot blast stove generally circulates between two main working conditions of heating and air supply. On the one hand, the bottom of the regenerator is frequently switched between low temperature and high temperature for a long time; on the other hand, the local welding seam of the bottom of the hot blast stove possibly exists in the construction process, such as insufficient welding and welding leakage; on the other hand, the bottom of the hot blast stove is easy to deform or the local welding line is easy to tear due to the existence of gaps in grouting or sand filling outside the bottom of the hot blast stove. Therefore, the hot blast stove can gradually leak at the bottom of the stove after being used for a period of time, the heat loss of the hot blast stove is great, the air pressure is insufficient, and the iron making capacity of the blast furnace is reduced. Hot blast air leaking from the bottom of the stove often contains a large amount of carbon monoxide, which may result in gas poisoning of the workers.
When the bottom of the hot blast stove is found to be small in leakage for the first time, the leakage is generally treated by adopting an outer wrapping method, namely, a furnace shell cylinder body and a furnace bottom outer frame are wrapped by an inverted L-shaped annular steel plate, foundation bolts are wrapped in the inverted L-shaped annular steel plate, and flowing grouting material is poured into the annular steel plate and the inner part of the annular steel plate, so that the original foundation, the cylinder body and the bottom outer frame form a closed whole together, and the purpose of controlling leakage is achieved. The method generally does not need to stop the wind or only needs to stop the wind for a short time, has small influence on production and low cost, and is a common treatment method. However, because the refractory material and the furnace bottom plate at the bottom of the hot blast furnace are continuously circulated at high temperature and low temperature, and the hot blast furnace shell and the refractory material in the furnace are continuously subjected to expansion-contraction circulation, a gap is formed between the grouting material and the inverted L-shaped annular steel plate shortly, and leakage occurs. In short, the external application method treats the symptoms and does not treat the root causes.
When hot air leakage at the bottom of the hot blast stove is large, heat energy loss, air pressure loss and air temperature loss of the hot blast stove are large, the blast furnace ironmaking operation efficiency is directly reduced, and the periphery of the hot blast stove also becomes a high-risk area. Under the condition, the whole blast furnace ironmaking system needs to be stopped and repaired by an internal repair method. The internal repair method is to completely remove the checker bricks, the grate and the refractory material at the bottom of the hot blast stove, completely or partially remove the large wall bricks, completely expose the bottom plate of the stove, carefully check welding spots and welding seams one by one, finish repair welding treatment of the found leakage points one by one, and then reinstall the large wall bricks, the grate and the checker bricks. The method has the advantages that the leakage of the furnace bottom plate can be thoroughly blocked, and the leakage problem is fundamentally solved. The method has the defects of large quantity of refractory materials in the furnace, long construction period (generally 45-90 days for a single furnace), high construction cost and large furnace shutdown loss.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating air leakage of a hot blast stove bottom plate, which has short construction period and low cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for treating air leakage of a bottom plate of a hot blast stove comprises the following steps:
the method comprises the following steps: the concrete foundation top at the bottom of the hot blast stove is provided with a plurality of first mounting grooves, and two ends of each first mounting groove are respectively positioned at two sides of the bottom of the hot blast stove;
horizontally inserting a first steel plate into the first mounting groove, wherein two ends of the first steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; tightly jacking the first steel plate and the bottom of the hot blast stove by using a supporting device; a first pouring space is formed between the first steel plate and the first mounting groove, and an opening of the first pouring space is positioned at the top of the first mounting groove;
restoring the first reinforcing mesh in the first mounting groove, and restoring the mounting of the first foundation bolt and the outer frame at the bottom of the hot blast stove;
pouring concrete in the first pouring space;
step two: cutting off the concrete foundation between two adjacent first mounting grooves to form a second mounting groove;
horizontally inserting a second steel plate into the second mounting groove, wherein two ends of the second steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; the second steel plate is tightly propped against the bottom of the hot blast stove by using a supporting device; a second pouring space is formed between the second steel plate and the second mounting groove, and an opening of the second pouring space is positioned at the top of the second mounting groove;
welding a first steel plate and a second steel plate, and respectively welding the first steel plate and the second steel plate with the periphery of the bottom of the hot blast stove;
restoring the second reinforcing mesh in the second mounting groove and restoring the mounting of the second ground bolt and the outer frame at the bottom of the hot blast stove;
and pouring concrete in the second pouring space.
Furthermore, after the first mounting groove in the first step is formed, a clamping groove is formed along the length direction of the top end of the side wall of the first mounting groove, and the clamping groove is positioned between every two adjacent first mounting grooves; one side of the first steel plate along the length direction is clamped in the clamping groove;
the width of the first steel plate is larger than that of the first mounting groove, and the sum of the width of the first mounting groove and the width of the clamping groove is larger than that of the first steel plate.
Further, or in the first step, the first steel plate is welded with the outer frame at the bottom of the hot blast stove.
Further, before the concrete is poured in the first step, a foam board is installed on the side wall of the first installation groove, and the height and the length of the foam board are respectively matched with those of the first installation groove.
Furthermore, before the foam board is installed, a plastic pipe is arranged on the inner side of the first installation groove along the length direction, and two ends of the plastic pipe are respectively positioned on the outer side of the bottom of the hot blast stove.
Further, the width of the first installation groove and/or the second installation groove is: 800-1500 mm, height is: 800-1000 mm.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for treating air leakage of a hot blast stove bottom plate, which has short construction period and low cost. The method does not need to dismantle and rebuild the refractory materials in the hot blast stove, can finish the construction within 12-30 days in a short time by a single stove, and has short construction period and low cost.
Drawings
FIG. 1 is a schematic structural view of a concrete foundation provided with a first mounting groove and a second mounting groove;
FIG. 2 is a front view of the hot blast stove of the present invention mounted on a concrete foundation;
FIG. 3 is a schematic structural view of the present invention illustrating a first mounting groove;
FIG. 4 is a schematic structural view of the present invention illustrating a second mounting groove;
fig. 5 is a schematic view illustrating the construction of the present invention for restoring the first anchor bolt and the first mesh reinforcement after inserting the first steel plate;
fig. 6 is a schematic view showing the construction of the restoring second ground bolt and the second reinforcing mat according to the present invention after inserting the second steel plate;
the reference numbers in the figures are: 1-hot blast stove; 2-concrete foundation; 3-a first mounting groove; 4-a second mounting groove; 31-a first steel plate; 32-a second steel plate; 33-a first anchor bolt; 34-a second footing bolt; 35-a first reinforcing mesh; 36-a second mesh reinforcement; 5-a foam board; 6-plastic pipe; 7-card slot.
Detailed Description
The present invention will be further described with reference to the following examples.
A method for treating air leakage of a bottom plate of a hot blast stove comprises the following steps:
the method comprises the following steps: the concrete foundation top at the bottom of the hot blast stove is provided with a plurality of first mounting grooves, and two ends of each first mounting groove are respectively positioned at two sides of the bottom of the hot blast stove;
horizontally inserting a first steel plate into the first mounting groove, wherein two ends of the first steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; tightly jacking the first steel plate and the bottom of the hot blast stove by using a supporting device; a first pouring space is formed between the first steel plate and the first mounting groove, and an opening of the first pouring space is positioned at the top of the first mounting groove;
restoring the first reinforcing mesh in the first mounting groove, and restoring the mounting of the first foundation bolt and the outer frame at the bottom of the hot blast stove;
pouring concrete in the first pouring space;
step two: cutting off the concrete foundation between two adjacent first mounting grooves to form a second mounting groove;
horizontally inserting a second steel plate into the second mounting groove, wherein two ends of the second steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; the second steel plate is tightly propped against the bottom of the hot blast stove by using a supporting device; a second pouring space is formed between the second steel plate and the second mounting groove, and an opening of the second pouring space is positioned at the top of the second mounting groove;
welding a first steel plate and a second steel plate, and respectively welding the first steel plate and the second steel plate with the periphery of the bottom of the hot blast stove;
restoring the second reinforcing mesh in the second mounting groove and restoring the mounting of the second ground bolt and the outer frame at the bottom of the hot blast stove;
and pouring concrete in the second pouring space.
The bottom of the hot blast stove 1 is fixedly provided with an outer frame, and the outer frame at the bottom is fixedly connected with the concrete foundation 2 through a first foundation bolt 33 and a second foundation bolt 34. The concrete foundation is provided with a first reinforcing mesh 35 and a second reinforcing mesh 36 for enhancing the stress strength of the concrete foundation 2. When the concrete is implemented, in the first step, a plurality of first mounting grooves 3 are formed in the top of a concrete foundation 2 at the bottom of a hot blast stove 1 by using a diamond wire saw, and cut concrete is moved out. When the concrete foundation 2 is cut, the original first anchor bolt 33 and the original first mesh reinforcement 35 are cut, and when the concrete in the first mounting groove 3 is removed, the portion of the original first anchor bolt 33 in the cut concrete is removed together with the cut original first mesh reinforcement 35. The first steel plate 31 is horizontally inserted into the first mounting groove 3, so that two ends of the first steel plate 31 are respectively positioned at the outer side of the bottom of the hot blast stove 1. And then the first steel plate 31 is tightly propped against the bottom of the hot blast stove 1 by using the supporting device, a first pouring space is formed between the first steel plate 31 and the first installation groove 3, and an opening of the first pouring space is positioned at the top of the first installation groove 3. And welding the first steel plate 31 with the outer frame at the bottom of the hot blast stove 1. Restoring the first mesh reinforcement 35 in the first installation groove 3 means reinstalling a new first mesh reinforcement 35 in the first installation groove 3. Because former first rag bolt 33 is cut off when seting up first mounting groove 3, and former first rag bolt 33 has some to be removed along with the concrete, former first rag bolt 33's overall length can shorten. Therefore, the portion of the original first anchor bolt 33 connected to the bottom outer frame of the hot blast stove 1 is removed. Installing a new first anchor bolt 33, wherein the new first anchor bolt 33 penetrates through the outer frame at the bottom of the hot blast stove 1 and extends into the first mounting groove 3, welding one end, located in the first mounting groove 3, of the new first anchor bolt 33 with the original first anchor bolt 33 left in the concrete foundation 2, and connecting the new first anchor bolt 33 with the outer frame at the bottom of the hot blast stove 1 through a nut. Then, concrete is poured into the first casting space through the opening of the first casting space.
And secondly, cutting off the concrete foundation 2 between two adjacent first mounting grooves 3 by using a diamond wire saw to form a second mounting groove 4. When the concrete foundation 2 is cut, the second ground bolt 34 is cut, and when the concrete foundation in the second installation groove 4 is removed, the portion of the second ground bolt 34 in the cut concrete is removed together with the cut second mesh reinforcement 36. And horizontally inserting a second steel plate 32 into the second mounting groove 4, wherein two ends of the second steel plate 32 are respectively positioned at the outer side of the bottom of the hot blast stove 1, and tightly supporting the second steel plate 32 and the bottom of the hot blast stove 1 by using a supporting device. The first steel plate 31 and the second steel plate 32 are welded to form an integral body of the first steel plate 31 and the second steel plate 32. The first steel plate 31 and the second steel plate 32 are respectively welded to the periphery of the bottom of the hot blast stove 1, so that the first steel plate 31 and the second steel plate 32 form a new stove bottom of the hot blast stove 1. Restoring the second mesh reinforcement 36 in the second installation groove 4 means reinstalling a new second mesh reinforcement 36 in the second installation groove 4. Because the original second foundation bolt 34 is cut off when the second mounting groove 4 is formed, and part of the original second foundation bolt 34 is removed along with the concrete, the whole length of the original second foundation bolt 34 can be shortened. Therefore, the part of the original second geodetic bolt 34 connected with the outer frame at the bottom of the hot blast stove 1 is removed. The installation is new second rag bolt 34, and new second rag bolt 34 passes 1 bottom outer frame of hot-blast furnace, and extends to in the second mounting groove 4, and the one end that new second rag bolt 34 is located in second mounting groove 4 welds with former second rag bolt 34 of leaving over in concrete foundation 2, passes through the nut with 1 bottom outer frame of hot-blast furnace and is connected new second rag bolt 34. And finally, pouring concrete into the second pouring space through the opening of the second pouring space. The support means may be a support bar of adjustable length.
The first steel plate 31 is horizontally inserted in the first installation groove 3, the width of the first steel plate 31 is smaller than that of the first installation groove 3, and an installation gap is formed between the first steel plate 31 and the first installation groove 3 in the width direction. When concrete is poured in the first installation groove 3 in the step one, the poured concrete fills the installation gap between the first steel plate 31 and the first installation groove 3. The side of the first steel plate 31 needs to be welded with the side of the second steel plate 32, and when the concrete foundation between two adjacent first installation grooves 3 is cut off in the step two, the concrete filled in the installation gap is also cut off, which causes waste. In order to solve the technical problem, preferably, after the first installation groove 3 in the first step is opened, a clamping groove 7 is opened along the length direction of the top end of the side wall of the first installation groove 3, and the clamping groove 7 is located between two adjacent first installation grooves 3; one side of the first steel plate 31 along the length direction is clamped in the clamping groove 7; the width of the first steel plate 31 is greater than the width of the first mounting groove 3, and the sum of the width of the first mounting groove 3 and the width of the card slot 7 is greater than the width of the first steel plate 31. After the first installation grooves 3 in the first step are formed, the top of the concrete foundation 2 between two adjacent first installation grooves 3 is provided with the clamping groove 7, so that one side of the first steel plate 31 in the length direction is clamped in the clamping groove 7. Since the width of the first steel plate 31 is greater than the width of the first mounting groove 3, the sum of the width of the first mounting groove 3 and the width of the catching groove 7 is greater than the width of the first steel plate 31. Therefore, the first steel plate 31 is installed with no installation space between the first installation groove 3 in the width direction, the lower surface of the first steel plate 31 covers the first installation groove 3 in the width direction, and the side end of the first steel plate 31 extends to the position of the second installation groove 4. When the concrete foundation between two adjacent first installation grooves 3 is cut off in the second step, the concrete poured in the first pouring space is not cut off.
In the specific implementation, or in the first step, the first steel plate 31 is welded with the outer frame at the bottom of the hot blast stove 1. The first steel plate 31 can be fixedly connected with the outer frame at the bottom of the hot blast stove 1 to realize the position fixation.
In order to prevent the concrete foundation 2 between two adjacent first installation grooves 3 from being cut off in the second step, the concrete poured in the first pouring space in the first step is cut off. Preferably, before the concrete is poured in the first step, the foam board 5 is installed on the side wall of the first installation groove 3, and the height and the length of the foam board 5 are respectively matched with the height and the length of the first installation groove 3. The foam plates 5 arranged on the side walls of the first mounting grooves 3 protect the concrete poured in the first mounting grooves 3, and when the concrete foundation 2 between two adjacent first mounting grooves 3 is cut off in the step two, the concrete poured in the first pouring space in the step one is prevented from being damaged.
Before the foam plate 5 is installed, a plastic pipe 6 is arranged on the inner side of the first installation groove 3 along the length direction, and two ends of the plastic pipe 6 are respectively positioned on the outer side of the bottom of the hot blast stove 1. Set up plastic tubing 6, be favorable to the installation of diamond wire saw, avoid drilling once more, improve work efficiency.
For convenience of construction, preferably, the width of the first installation groove 3 and/or the second installation groove 4 is: 800-1500 mm, height is: 800-1000 mm.
The above is a specific implementation mode of the invention, and it can be seen from the implementation process that the invention provides a method for treating air leakage of a hot blast stove bottom plate, which has short construction period and low cost. The method does not need to dismantle and rebuild the refractory materials in the hot blast stove, can finish the construction within 12-30 days in a short time by a single stove, and has short construction period and low cost.
Claims (6)
1. A method for treating air leakage of a bottom plate of a hot blast stove is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the concrete foundation top at the bottom of the hot blast stove is provided with a plurality of first mounting grooves, and two ends of each first mounting groove are respectively positioned at two sides of the bottom of the hot blast stove;
horizontally inserting a first steel plate into the first mounting groove, wherein two ends of the first steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; tightly jacking the first steel plate and the bottom of the hot blast stove by using a supporting device; a first pouring space is formed between the first steel plate and the first mounting groove, and an opening of the first pouring space is positioned at the top of the first mounting groove;
restoring the first reinforcing mesh in the first mounting groove, and restoring the mounting of the first foundation bolt and the outer frame at the bottom of the hot blast stove;
pouring concrete in the first pouring space;
step two: cutting off the concrete foundation between two adjacent first mounting grooves to form a second mounting groove;
horizontally inserting a second steel plate into the second mounting groove, wherein two ends of the second steel plate are respectively positioned at the outer side of the bottom of the hot blast stove; the second steel plate is tightly propped against the bottom of the hot blast stove by using a supporting device; a second pouring space is formed between the second steel plate and the second mounting groove, and an opening of the second pouring space is positioned at the top of the second mounting groove;
welding a first steel plate and a second steel plate, and respectively welding the first steel plate and the second steel plate with the periphery of the bottom of the hot blast stove;
restoring the second reinforcing mesh in the second mounting groove and restoring the mounting of the second ground bolt and the outer frame at the bottom of the hot blast stove;
and pouring concrete in the second pouring space.
2. The method of treating blast furnace floor leakage according to claim 1, wherein: after the first mounting groove in the first step is formed, forming a clamping groove along the length direction of the top end of the side wall of the first mounting groove, wherein the clamping groove is positioned between two adjacent first mounting grooves; one side of the first steel plate along the length direction is clamped in the clamping groove;
the width of the first steel plate is larger than that of the first mounting groove, and the sum of the width of the first mounting groove and the width of the clamping groove is larger than that of the first steel plate.
3. The method of treating blast furnace floor leakage according to claim 1 or 2, wherein: or welding the first steel plate with the outer frame at the bottom of the hot blast stove in the first step.
4. The method of treating blast furnace floor leakage according to claim 1 or 2, wherein: before the concrete is poured in the first step, a foam plate is installed on the side wall of the first installation groove, and the height and the length of the foam plate are respectively matched with those of the first installation groove.
5. The method of treating blast furnace floor leakage according to claim 4, wherein: before the foam board is installed, a plastic pipe is arranged on the inner side of the first installation groove along the length direction, and two ends of the plastic pipe are respectively positioned on the outer sides of the bottoms of the hot blast stoves.
6. The method of treating blast furnace floor leakage according to claim 1 or 2, wherein: the width of first mounting groove or second mounting groove does: 800-1500 mm, height is: 800-1000 mm.
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| CN201910151212.2A CN109825658B (en) | 2019-02-28 | 2019-02-28 | Method for treating air leakage of hot blast stove bottom plate |
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| CN201910151212.2A CN109825658B (en) | 2019-02-28 | 2019-02-28 | Method for treating air leakage of hot blast stove bottom plate |
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| CN109825658B true CN109825658B (en) | 2020-10-16 |
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| CN110656213A (en) * | 2019-10-30 | 2020-01-07 | 陕西龙门钢铁有限责任公司 | A blast furnace hot blast stove base air leakage repair structure and construction 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU666204A1 (en) * | 1977-03-22 | 1979-06-05 | Украинский Государственный Институт По Проектированию Металлургических Заводов "Укргипромез" | Horizontal air heater |
| CN203333694U (en) * | 2013-07-19 | 2013-12-11 | 中国五冶集团有限公司 | Blocking structure for air heating furnace bottom air leakage |
| CN104293997B (en) * | 2013-07-19 | 2016-03-30 | 中国五冶集团有限公司 | A kind of plugging structure of hotblast stove furnace bottom gas leakage and implementation method |
| CN203891063U (en) * | 2014-06-18 | 2014-10-22 | 武钢集团昆明钢铁股份有限公司 | Leaking stoppage device of hot-blast furnace foundation |
| CN105331760B (en) * | 2015-11-11 | 2017-08-29 | 北京首钢股份有限公司 | The processing method that wall between a kind of air channel and gas pipe is damaged |
| CN106702063A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Cooling method for air leakage of hot blast valve supporting plate flange |
| CN108727002B (en) * | 2018-06-28 | 2021-06-08 | 中冶武汉冶金建筑研究院有限公司 | Plugging press-in material for air leakage of bottom foundation of hot blast stove |
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