CN107805678B - Drainage system for discharging accumulated water in blast furnace - Google Patents
Drainage system for discharging accumulated water in blast furnace Download PDFInfo
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- CN107805678B CN107805678B CN201711182660.6A CN201711182660A CN107805678B CN 107805678 B CN107805678 B CN 107805678B CN 201711182660 A CN201711182660 A CN 201711182660A CN 107805678 B CN107805678 B CN 107805678B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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Abstract
The invention relates to the technical field of blast furnace equipment, in particular to a drainage system for draining accumulated water in a blast furnace. The automatic water draining device is characterized by comprising at least one group of water draining pipelines, wherein one end of each water draining pipeline extends into a wall of the blast furnace to collect accumulated water in the blast furnace, the other end of each water draining pipeline is connected with the automatic water draining device, accumulated water is drained through the automatic water draining device, and coal gas is sealed. The invention has the beneficial effects that: the drainage pipeline is arranged on the furnace wall, accumulated water accumulated in the blast furnace in the production process of the blast furnace is drained in time, and coal gas is sealed in the blast furnace, so that the blast furnace is promoted to stably and safely operate, the service life of the blast furnace is prolonged, and the economic benefit is improved.
Description
Technical Field
The invention relates to the technical field of blast furnace equipment, in particular to a drainage system for draining accumulated water in a blast furnace.
Background
Blast furnace iron making is the main process method of iron making technology, the furnace life of the first generation of large and medium blast furnaces in China is mostly 10-15 years, and the furnace life of the first generation of blast furnaces in developed countries such as Germany and Japan abroad is generally 15-20 years. The cost of newly building or overhauling a blast furnace is huge, and the enterprise benefit is obviously influenced. In recent years, the domestic and foreign blast furnaces frequently have hearth burnthrough accidents and suffer from the trouble of abnormal rise of the temperature of hearth carbon bricks, some blast furnaces are burnt through even in 1 to 2 years of operation, the production life of large and medium blast furnaces is greatly shortened, the safety production of the blast furnaces is seriously threatened, and huge economic loss is caused to enterprises.
The service life of the first-generation blast furnace is usually calculated by the service life of a blast furnace hearth, liquid molten iron and slag (1450-1550 ℃) are accumulated in the hearth, the lining of the blast furnace hearth is made of refractory materials, usually carbon refractory bricks, and a water-cooling wall is arranged on the cold surface of the refractory bricks. During the production process, the accumulated water in the refractory material of the blast furnace hearth has two main sources, one is that the cooling equipment at the tuyere and above is damaged and leaks water, the working environment of the blast furnace tuyere equipment is severe, and partial cooling water after the damage leaks into a gap between a refractory brick and the cooling equipment and is accumulated in the refractory material; and secondly, supersaturated moisture carried by blast furnace gas, the blast furnace blast air and the moisture carried by raw fuel are completely vaporized at high temperature, part of the moisture is condensed after escaping to a furnace shell or cooling equipment along with the gas, and liquid water is accumulated in a hearth refractory material along the furnace shell or the cooling equipment under the action of gravity because a hearth is positioned at the bottom of the blast furnace.
The blast furnace hearth can stably run for a long time and depends on the cooling equipment and refractory materials to form a stable heat transfer system, if moisture enters the hearth refractory materials, on one hand, the moisture and the hearth carbonaceous refractory materials generate chemical reaction at high temperature to erode the hearth refractory materials; on the other hand, after the water is heated, the water is vaporized, and huge pressure is formed in a closed space in the furnace wall to push the furnace wall or the cooling wall to deform, so that a gap is formed between the cooling wall and the refractory material, a hearth heat transfer system is damaged, the hearth carbon bricks are abnormally corroded, and the service life of the blast furnace is shortened; when the evaporation amount of the moisture is large, the pressure in the refractory material of the furnace hearth reaches a certain peak value, the local refractory material of the furnace hearth is possibly pushed to shift, a molten iron channel appears in the furnace hearth, and serious accidents such as burnthrough of the furnace hearth of the blast furnace are caused.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a drainage system for draining accumulated water in a blast furnace, which is used to drain water accumulated in the furnace wall of the blast furnace in time, thereby improving the cooling efficiency of the furnace wall of the blast furnace and reducing the erosion rate of the refractory material of the furnace wall.
In order to achieve the above and other related objects, the present invention provides a drainage system for draining accumulated water in a blast furnace, comprising at least one set of drainage pipelines, wherein one end of each drainage pipeline extends into a wall of the blast furnace to collect accumulated water in the blast furnace, and the other end of each drainage pipeline is connected with an automatic drainage device, and the automatic drainage device drains accumulated water and seals coal gas.
The beneficial effects of the invention are: through set up water drainage pipeline on the brickwork, in time discharge the ponding in the production process in the blast furnace to make coal gas seal in the blast furnace, promote the stable safe ground operation of blast furnace, prolong blast furnace life, improve economic benefits.
Furthermore, the drainage pipeline comprises a drainage main pipe connected with the automatic drainage device and at least one drainage short pipe extending into the wall of the blast furnace to reach the refractory material in the furnace, each drainage short pipe is connected with the drainage main pipe through a drainage branch pipe, and the accumulated water in the blast furnace is collected through the drainage short pipe.
Furthermore, a branch pipe valve is arranged on the drainage branch pipe.
Further, the automatic drainage device is arranged at the drainage end of the drainage main pipe.
Furthermore, the automatic drainage device comprises a first main pipe valve, a second main pipe valve and a drainer which are arranged on a main drainage pipe, and accumulated water in the main drainage pipe sequentially enters the drainer through the first main pipe valve and the second main pipe valve to be drained so as to seal coal gas.
Further, the drainer is sealed and provided with a water outlet, and the water outlet is connected with sewage treatment equipment.
The beneficial effect of adopting the further scheme is that: the arrangement of the short drainage pipe and the branch drainage pipe facilitates the timely delivery of accumulated water at each position in the blast furnace to the main drainage pipe for converging and centralized treatment, thereby reducing the difficulty of pipeline installation; the branch pipe valve is arranged, so that automatic closing or opening is conveniently realized, the drainage branch pipe and the drainage main pipe are separated, and the maintenance of the drainage short pipe is convenient; by arranging the first main pipe valve and the second main pipe valve, the automatic operation is convenient to realize, and the drainer is convenient to overhaul or replace; the drainer adopts sealed setting, is convenient for realize ponding discharge, avoids the coal gas leakage.
Further, automatic drainage device is including installing main pipe valve one and main pipe valve two on the main sewer of drainage, be equipped with the sealed U type water seal arrangement that can impound between main pipe valve one and the main pipe valve two.
And the first main pipe valve and the second main pipe valve are opened and closed according to liquid level signals of the liquid level meters for draining water, and are matched with the water sealing device for limiting gas leakage.
The beneficial effect of adopting the further scheme is that: when the liquid level in the liquid level meter reaches a preset high liquid level, closing the first main pipe valve, opening the second main pipe valve, and starting drainage by the drainage system; when the liquid level reaches a preset low liquid level, closing a second main pipe valve, opening the first main pipe valve, and starting water storage by the drainage system; and a U-shaped water seal device is arranged to prevent coal gas from overflowing after water drainage is finished.
Furthermore, the water inlet end of the drainage short pipe penetrates through a preformed hole in the blast furnace wall to collect the accumulated water in the blast furnace, or the water inlet end of the drainage short pipe is shared with other orifices and extends into the blast furnace wall to collect the accumulated water in the blast furnace, so that the application range is wide, the installation and the operation are simple and convenient, the orifices arranged on the blast furnace wall are fully utilized, and the economic benefit is improved.
Furthermore, the multiple groups of drainage pipelines are arranged along the circumferential direction of the blast furnace wall, and the plurality of drainage short pipes of each group of drainage pipelines are arranged along the circumferential direction and/or the height direction of the blast furnace wall, so that moisture in the blast furnace can be timely and sufficiently discharged, the safety performance is improved, and the service life is prolonged.
Drawings
FIG. 1 is a schematic view showing a structure of an automatic drainage apparatus of a drainage system for draining accumulated water in a blast furnace according to an embodiment of the present invention, which is provided with a drainer;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic plan view showing a drainage system for draining accumulated water in a blast furnace according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structure of the automatic drainage apparatus of the drainage system for draining accumulated water in a blast furnace according to the embodiment of the present invention, which is provided with a water seal apparatus;
FIG. 5 is a schematic structural diagram according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the invention.
Description of reference numerals
1. A refractory brick;
2. filling a gap;
3. a cooling device;
4. a thermocouple;
5. a short drainage pipe;
6. a furnace shell;
7. a branch pipe valve;
8. a drain branch pipe;
9. a main drain pipe;
10. a water discharge device;
11. a water discharge port;
12. sealing the flange;
13. a first main pipe valve;
14. a second main valve;
15. a liquid level meter;
16. a water seal device.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship between the terms and the corresponding elements may be made without substantial technical changes.
Before describing embodiments of the present invention in detail, the present invention will be described in an application environment. The technology of the invention is mainly applied to the field of blast furnace equipment in the iron-making technology, in particular to the field of a drainage system in a blast furnace. The invention solves the technical problems that in the production process, moisture in the blast furnace enters the hearth refractory material, so that the refractory material is easy to corrode, the service life of the blast furnace is short, and the safety performance is low. In the invention, the refractory material is a refractory brick or an indefinite joint filler and the like, and by arranging the drainage system, even though water is continuously accumulated on the furnace wall in the blast furnace in the production process, the accumulated water in the blast furnace can be timely drained through the drainage system, so that the accumulated water is prevented from entering the refractory material of a hearth of the blast furnace to cause a gap in the refractory material, the erosion rate of the refractory material is reduced by reducing the accumulated water in real time, and the service life of the blast furnace is prolonged.
As shown in fig. 1 to 3, the drainage system for draining accumulated water in a blast furnace according to the embodiment of the present invention includes at least one set of drainage pipeline, one end of the drainage pipeline extends into a wall of the blast furnace to collect accumulated water in the blast furnace, the other end of the drainage pipeline is connected to an automatic drainage device, the automatic drainage device separates accumulated water and drains water, and gas continues to be retained in the drainage pipeline or the blast furnace.
As shown in fig. 1 to 3, the blast furnace is of a cylindrical structure, the furnace wall of the blast furnace comprises a furnace shell 6, a cooling device 3 and refractory materials which are arranged from outside to inside in sequence, in the invention, the refractory materials comprise joint compound 2 and refractory bricks 1, the joint compound 2 is positioned between the cooling device 3 and the refractory bricks 1, and the cooling device 3 can be a cooling wall or some other device with a cooling function. Molten iron and slag in the blast furnace are contacted with the refractory bricks 1, a water accumulation mixture accumulated in the blast furnace is generally concentrated in the area of the joint compound 2 in the production process, the water accumulation mixture comprises coal gas, water vapor and the like generated under a high-temperature condition, if moisture in the joint compound 2 cannot be discharged in time, the moisture is easy to enter the refractory bricks 1, and the refractory bricks 1 are easy to corrode, deform and shift under the action of high temperature.
As shown in fig. 1 to 3, the drainage pipeline comprises a drainage main pipe 9 connected with the automatic drainage device and at least one drainage short pipe 5 extending into the furnace wall of the blast furnace to reach the position of the refractory material in the furnace for collecting water accumulated in the blast furnace, each drainage short pipe 5 is connected with the drainage main pipe 9 through a drainage branch pipe 8, a branch pipe valve 7 is arranged on each drainage branch pipe 8, the branch pipe valves 7 are manual valves, electric valves, pneumatic valves, hydraulic valves and the like, and are selectively arranged according to requirements so as to realize manual on-site opening or remote opening, and the operation is simple and convenient. The water inlet end of the drainage short pipe 5 sequentially penetrates through the furnace shell 6 and the cooling device 3 and then contacts with the joint filling material 3, accumulated water enters the drainage short pipe 5 under the action of gravity and pressure of the accumulated water, and then enters the automatic drainage device through the drainage branch pipe 8 and the drainage main pipe 9 to achieve separation of coal gas and water. The moisture is discharged through the short drainage pipe 5, so that the erosion speed of the refractory brick 1 is reduced, the service life is prolonged, and the stable working performance of the blast furnace is improved.
As shown in fig. 1 to 3, the automatic drainage device is disposed at the drainage end of the main drainage pipe 9, the automatic drainage device includes a first main pipe valve 13, a second main pipe valve 14 and a drainer 10 which are sequentially installed on the main drainage pipe 9, and the accumulated water in the main drainage pipe 9 sequentially passes through the first main pipe valve 13 and the second main pipe valve 14 and then enters the drainer 10 for accumulated water separation. The drainer 10 is hermetically provided with a drain port 11, and the drain port 11 is connected to a sewage treatment facility so as to periodically drain water through the drain port 11. The drainer 10 realizes the separation of coal gas and water, the water is discharged into the sewage treatment device through the water outlet 11, and the coal gas is continuously remained in the water discharge pipeline and the blast furnace, thereby avoiding the leakage of the coal gas and improving the safety performance.
As shown in fig. 4, the automatic drainage device may also adopt another structure, and has a specific structure as follows, the automatic drainage device includes a first main pipe valve 13, a level meter 15 and a second main pipe valve 14 which are sequentially installed on the main drainage pipe 9, a water seal device 16 capable of storing water and sealing is arranged between the level meter 15 and the second main pipe valve 14, accumulated water in the main drainage pipe 9 passes through the first main pipe valve 13 and then is separated from gas by the water seal device 16, and then the water is discharged into the sewage treatment equipment through the second main pipe valve 14. In the invention, a positive U-shaped pipeline and an inverted U-shaped pipeline are connected end to form the water seal device, so that accumulated water is always accumulated in the water seal device 16 to avoid gas leakage, the liquid level meter 15 is arranged at the water inlet end of the water seal device 16 and is used for detecting the liquid level in the water seal device 16, and the main pipe valve II 14 is arranged at the water outlet end of the water seal device 16. When the liquid level in the liquid level meter 15 reaches a preset high liquid level, closing the first main pipe valve 13, isolating coal gas from accumulated water at the water inlet end of the main drainage pipe 9, opening the second main pipe valve 14, draining water accumulated in the water sealing device 16, and delivering the drained water into sewage treatment equipment; when the liquid level reaches the preset low liquid level, the second main pipe valve 14 is closed, the first main pipe valve 13 is opened, and the drainage system starts to store water.
The first main pipe valve 13 and the second main pipe valve 14 in the automatic drainage device are any one of valves such as a manual valve, an electric valve, a pneumatic valve, a hydraulic valve and the like or a combination of any two of the valves, and the specific selection type is set according to requirements. The automatic drainage device is provided with the first main pipe valve 13 and the second main pipe valve, manual local opening or remote opening can be conveniently selected according to requirements, automatic operation of opening or closing of the valves is achieved, accumulated moisture can be conveniently and periodically discharged, meanwhile, leakage of coal gas is effectively avoided, and safety performance is improved.
As shown in fig. 1 to fig. 3, the number of the sets of the drainage pipelines is selected according to the requirement, and when the plurality of sets of the drainage pipelines are arranged, the plurality of sets of the drainage pipelines are arranged along the circumferential direction of the furnace wall of the blast furnace, that is, the drainage pipelines are arranged around the furnace wall of the blast furnace. And, a plurality of drainage nozzle stub 5 of every group drainage pipe can only set up along blast furnace brickwork circumferencial direction, or only set up along blast furnace brickwork direction of height, or evenly be equipped with drainage nozzle stub 5 in blast furnace brickwork circumferencial direction and direction of height, the quantity that sets up of drainage nozzle stub 5, set up the pipe diameter and set up the position and can set up according to particular case and demand, so that abundant timely ponding in the discharge blast furnace, avoid moisture to cause refractory's in the blast furnace stove corrosion.
For further clarity, the following examples are provided to illustrate the specific installation of the drain line on the furnace wall of the blast furnace, but the installation is not limited to the following examples.
The first embodiment is as follows:
as shown in fig. 1 to 3 and 5, the water inlet end of the short water discharge pipe 5 is shared with other orifices, extends into the wall of the blast furnace to collect accumulated water in the blast furnace, and the other orifices can be temperature measuring holes for installing a refractory thermocouple 4, grouting holes and the like, so that the existing orifices are fully utilized, and the workload is reduced. When the drainage short pipe 5 and the thermocouple 4 share an orifice, the cooling device 3 arranged on the cold surface of the joint filler 2 is a cooling wall, the outer side of the cooling wall is a furnace shell 6 made of a steel plate, a blast furnace hearth is provided with a plurality of thermocouples 4, the thermocouples 4 sequentially penetrate through the furnace shell 6, the cooling device 3 and the joint filler 2 and extend into the refractory brick 1, when the drainage short pipe 5 and the thermocouples 4 share an orifice, the drainage short pipe 5 is sleeved on the thermocouple 4 and sequentially penetrates through the furnace shell 6 and the cooling device 3 to reach the joint filler 2, and the drainage short pipe 5 is fixed on the blast furnace wall. The one end that the blast furnace brickwork was kept away from to drainage nozzle stub 5 is sealed through sealing flange, and drainage branch pipe 8 and drainage nozzle stub 5 fixed connection to with the inside intercommunication of drainage nozzle stub 5, realize ponding and carry. In this embodiment, the drain branch pipe 8 is a DN25 steel pipe, the branch valve 7 on the drain branch pipe 8 is a DN25 ball valve, the drain branch pipe 8 is collected and sent into the drain main pipe 9 through about 27 branch pipes, the drain main pipe 9 is a DN40 steel pipe, the main pipe valve one 13 and the main pipe valve two 14 on the drain main pipe 9 are ball valves, the installation position of the drainer 10 is lower than all the drain branch pipes, the drainer 10 can be installed on the ground, after the installation is completed, the branch valve 7, the main pipe valve one 13 and the main pipe valve two 14 are kept in a normally open state in a normal production state, accumulated water in the blast furnace sequentially passes through the drain short pipe 5, the drain branch pipe 8 and the drain main pipe 9 and then enters the automatic drainage device, and finally is discharged through the drainage port 11.
The second embodiment:
as shown in fig. 4 and fig. 6, the water inlet end of the short water discharge pipe 5 penetrates through a reserved hole on the wall of the blast furnace to collect the accumulated water in the blast furnace, when the blast furnace is installed, if no available hole exists on the wall of the blast furnace, the short water discharge pipe 5 is directly drilled and inserted into the wall of the blast furnace or the reserved hole is arranged on the wall of the blast furnace, the short water discharge pipe 5 penetrates through the furnace shell 6 and the cooling device 3 to reach the joint filler 2, one end of the short water discharge pipe 5, which is far away from the wall of the blast furnace, is sealed by a sealing flange 12, a water discharge branch pipe 8 is welded on the side surface of the short water discharge pipe 5, a branch pipe valve 7 is arranged on the water discharge branch pipe 8, a plurality of water discharge branch pipes 8 are collected and connected with a main water discharge pipe 9, the water discharge end of the main water discharge pipe 9 is provided with a main pipe valve one 13, a liquid level meter 15, a water seal device 16 and a main pipe valve two 14, the coal gas and the water at the water inlet end of the main discharge pipe 9 sequentially pass through the main pipe valve one 13, the main pipe valve one 13 to realize the separation of the coal gas and water seal device 16, the coal gas and water seal device, the coal gas and water discharge is discharged, thereby avoiding the discharge of the water discharge, improving the safety performance, facilitating the concentrated storage, and the simple operation.
According to the invention, the drainage system with a simple structure is arranged on the blast furnace wall to continuously drain accumulated water generated in the furnace in the production process of the blast furnace, so that the accumulated water is prevented from entering the refractory material of the blast furnace wall, the safe and stable operation of the blast furnace is effectively promoted, the service life of the blast furnace is prolonged, and the economic benefit is improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A drainage system for discharging accumulated water in a blast furnace is characterized in that: the automatic water draining device comprises at least one group of water draining pipelines, wherein one end of each water draining pipeline extends into a blast furnace wall to collect accumulated water in the blast furnace, the blast furnace wall comprises a furnace shell, cooling equipment and refractory materials which are sequentially arranged from outside to inside, the refractory materials comprise joint filling materials and refractory bricks, the joint filling materials are positioned between the cooling equipment and the refractory bricks, and the other end of each water draining pipeline is connected with the automatic water draining device, accumulated water is drained through the automatic water draining device, and coal gas is sealed;
the drainage pipeline comprises a main drainage pipe and at least one short drainage pipe, the main drainage pipe is connected with the automatic drainage device, the water inlet end of the short drainage pipe sequentially penetrates through the furnace shell and the cooling equipment and then is contacted with the joint filling material, collects accumulated water in the blast furnace and is connected with the main drainage pipe;
the automatic drainage device is arranged at the drainage end of the drainage main pipe.
2. The water drainage system for draining accumulated water in a blast furnace according to claim 1, wherein: each short drainage pipe is connected with the main drainage pipe through a branch drainage pipe.
3. The water drainage system for draining accumulated water in a blast furnace according to claim 2, wherein: the water inlet end of the drainage short pipe penetrates through a preformed hole on the furnace wall of the blast furnace to collect the accumulated water in the blast furnace, or the drainage short pipe and other orifices on the furnace wall are shared to collect the accumulated water in the blast furnace.
4. The water drainage system for draining accumulated water in a blast furnace according to claim 2, wherein: and branch pipe valves are arranged on the drainage branch pipes.
5. The water drainage system for draining accumulated water in a blast furnace according to claim 1, wherein: the automatic drainage device comprises a first main pipe valve, a second main pipe valve and a drainer, wherein the first main pipe valve, the second main pipe valve and the drainer are installed on a main drainage pipe, and accumulated water in the main drainage pipe sequentially enters the drainer through the first main pipe valve and the second main pipe valve.
6. The water drainage system for draining accumulated water in a blast furnace according to claim 5, wherein: the drainer is sealed to limit gas leakage and is provided with a water outlet for draining water.
7. The water drainage system for draining accumulated water in a blast furnace according to claim 1, wherein: the automatic drainage device comprises a first main pipe valve and a second main pipe valve which are installed on a main drainage pipe, and a U-shaped water seal device capable of storing water and sealing is arranged between the first main pipe valve and the second main pipe valve.
8. The water drainage system for draining accumulated water in a blast furnace according to claim 7, wherein: the water seal device is provided with a liquid level meter for measuring liquid level, the main pipe valve I and the main pipe valve II are opened and closed to drain water according to liquid level signals of the liquid level meter, and are matched with the water seal device to limit gas leakage.
9. The water drainage system for draining accumulated water in a blast furnace according to claim 1, wherein: the multiple groups of the drainage pipelines are arranged along the circumferential direction of the blast furnace wall, and the plurality of the short drainage pipes of each group of the drainage pipelines are arranged along the circumferential direction and/or the height direction of the blast furnace wall.
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| CN201711182660.6A CN107805678B (en) | 2017-11-23 | 2017-11-23 | Drainage system for discharging accumulated water in blast furnace |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109735672B (en) * | 2019-03-15 | 2024-02-23 | 中冶赛迪工程技术股份有限公司 | Water collecting and draining method and device for blast furnace hearth |
| CN111893231A (en) * | 2020-05-29 | 2020-11-06 | 广东韶钢松山股份有限公司 | Blast furnace hearth and casting long-life lifting method thereof |
| CN113337656B (en) * | 2021-06-29 | 2022-04-12 | 广东韶钢松山股份有限公司 | Drainage method for hearth during blow-in period after cast repair in blast furnace |
| CN115449575A (en) * | 2022-08-26 | 2022-12-09 | 北京首钢股份有限公司 | Water collecting and draining method after integral casting of blast furnace hearth |
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