CN113136469A - Blast furnace hearth - Google Patents
Blast furnace hearth Download PDFInfo
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- CN113136469A CN113136469A CN202110264614.0A CN202110264614A CN113136469A CN 113136469 A CN113136469 A CN 113136469A CN 202110264614 A CN202110264614 A CN 202110264614A CN 113136469 A CN113136469 A CN 113136469A
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- channel
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- blast furnace
- cylinder body
- boss
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/02—Internal forms
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
Abstract
The invention relates to a blast furnace hearth, which belongs to the technical field of iron-making equipment and solves the technical problems that the temperature of a thermocouple of the existing blast furnace hearth is suddenly increased and the temperature difference of a cooling wall of the hearth is increased; the cooling device comprises a cylinder body, a boss, a cooling channel and a cooling channel, wherein the boss is small at the upper part and big at the lower part; the ceramic tile is built on the outer side wall of the lower part of the boss to form a first surrounding wall, the ceramic tile is built on the elephant foot area of the cylinder body to form a second surrounding wall, the ceramic tile is built on the bottom of the cylinder body to form a floor, and an annular molten iron channel is formed among the first surrounding wall, the floor and the second surrounding wall; the side wall of the cylinder body is provided with a tap hole which is positioned above the annular molten iron channel. The blast furnace hearth with the structure can guide the flow of the entering liquid iron slag and furnace burden, strengthen the formation of molten iron circulation, and avoid the diversion of molten iron, thereby avoiding the diversion of molten iron to wash out the brick lining, and further prolonging the service life of the blast furnace hearth.
Description
Technical Field
The invention belongs to the technical field of steelmaking equipment, and particularly relates to a blast furnace hearth.
Background
With the large-scale of the blast furnace, the production capacity of a single blast furnace is continuously improved, and any production link in the production has problems, which can seriously affect the comprehensive benefits of the whole group. Therefore, modern large-scale blast furnaces all adopt comprehensive structures such as microporous carbon bricks, ceramic mats, American Union carbon NMA and NMD bricks and the like, and the construction cost accounts for a large proportion in a first-generation furnace service. At present, the problems that the temperature of a hearth thermocouple is suddenly increased and the temperature difference of a hearth cooling wall is increased frequently occur in a large-sized blast furnace, the blast furnace is forced to reduce the yield of molten iron for hearth maintenance, serious potential safety hazards are brought to blast furnace production, if hearth brick linings are replaced, the overhaul cost is high, the overhaul time is long, and the overall benefit of the whole company is seriously influenced.
Disclosure of Invention
The invention provides a blast furnace hearth, which is used for solving the technical problems that the temperature of a thermocouple of the blast furnace hearth suddenly rises and the temperature difference of a cooling wall of the hearth rises in the prior art.
The invention is realized by the following technical scheme: a blast furnace hearth, comprising:
the cylinder body comprises a elephant foot area positioned at the joint of the cylinder bottom of the cylinder body and the side wall of the cylinder body;
the cooling device comprises a cylinder body, a boss, a cooling channel and a cooling channel, wherein the boss is large in upper part and small in lower part or is equal in diameter in upper part and lower part, the boss is internally provided with the cooling channel, and the boss is arranged in the middle of the bottom of the cylinder body;
the ceramic tile is laid on the outer side wall of the lower part of the boss to form a first surrounding wall, the ceramic tile is laid on the elephant foot area of the cylinder body to form a second surrounding wall, the ceramic tile is laid on the bottom of the cylinder body to form a floor, and the first surrounding wall, the floor and the second surrounding wall form an annular molten iron channel;
and a taphole is arranged on the side wall of the cylinder body and is positioned above the annular molten iron channel.
Further, in order to better realize the invention, the height of the annular molten iron channel is 2m-2.5m, and the vertical distance between the tapping hole and the annular molten iron channel is 1.5m-3 m.
Further, in order to better implement the present invention, the boss includes:
one end of the annular block body is fixedly connected to the cylinder bottom of the cylinder body;
a plate-like block body;
the first enclosure wall surrounds the enclosure wall, the plate-shaped blocks are laid on the table top of the platform, and the plate wall is laid on the upper surfaces of the plate-shaped blocks;
the cooling channel comprises a first channel and a second channel, and the first channel and the second channel are respectively arranged in the annular block body and the plate-shaped block body.
Further, to better implement the present invention, the fence includes:
the bottom end of the lower section is fixedly connected with the cylinder bottom of the cylinder body;
the conical bottom end of the upper section is connected with the top end of the lower section, the upper section and the lower section are coaxial, and the plate-shaped block body is laid at the conical top end of the upper section;
the first surrounding wall surrounds the lower section, and the outer surface of the first surrounding wall is flush with the outer edge of the conical bottom end of the upper section.
Further, in order to better implement the present invention, the refractory bricks of the lower section are NMA bricks.
Further, in order to better implement the present invention, the refractory bricks of the upper section comprise NMD bricks and NMA bricks, the NMA bricks are laid to form a first brick wall, the NMD bricks are laid to form a second brick wall, and the first brick wall is located between the second brick wall and the annular block.
Further, in order to better implement the present invention, the thickness of the lower section is 800-1000mm, and the thicknesses of the first brick wall and the second brick wall are the same.
Furthermore, in order to better realize the invention, the refractory bricks of the plate wall are NMA bricks, and the masonry mode of the plate wall is an embedded type.
Furthermore, in order to better realize the invention, an overhaul channel is arranged at the center of the bottom of the cylinder body and is communicated with the inner hole of the annular block body.
Furthermore, in order to better realize the invention, the first channel is provided with a first water inlet and a first water outlet, the second channel is provided with a second water inlet and a second water outlet, and the first water inlet, the first water outlet, the second water inlet and the second water outlet are all communicated with the maintenance channel.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a blast furnace hearth which comprises a cylinder body, a boss and ceramic tiles, wherein the cylinder body is provided with a cylinder bottom and a elephant foot area, the boss is arranged in the middle of the bottom of the cylinder body, a cooling channel is arranged inside the boss and used for reducing the temperature of the boss, the ceramic tiles are built on the outer side wall of the lower portion of the boss to form a first surrounding wall, the ceramic tiles are built on the elephant foot area of the cylinder body to form a second surrounding wall, the ceramic tiles are built on the cylinder bottom of the cylinder body to form a floor, the first surrounding wall, the second surrounding wall and the floor form an annular molten iron channel, an iron outlet is arranged on the side wall of the cylinder body and positioned above the annular molten iron channel, by adopting the structure, the cylinder body is filled with molten iron, the molten iron can flow out from the iron outlet, the boss is in a structure with a small upper part and a lower part or an upper part and a lower part and an equal diameter and is arranged in the middle of the bottom of the cylinder body, so that furnace burden is distributed around the boss under the flow guiding effect of the boss after entering the cylinder body, and the boss cooled by the cooling channel can accelerate the chemical reaction of the furnace charge, thereby forming a hard and corrosion-resistant protective layer on the surface of the boss to protect the boss, the annular molten iron channel can strengthen the formation of molten iron circumfluence, is beneficial to the rapid replacement of slag iron flowing and dead coke heaps, reduces the influence of the dead coke heaps on the molten iron circumfluence, is beneficial to the discharge of the molten iron and the slag iron, because the circulation of the molten iron is strengthened, the molten iron can not change the way in the flowing process, and further can not scour the brick lining of the ceramic brick, therefore, the probability of the temperature of the thermocouple at the position suddenly rising and the temperature difference of the cooling wall of the furnace hearth rising is lower, therefore, the influence of the overturning and the caving of the dead coke pile on the cylinder body and the cylinder bottom brick lining can be reduced, so that the probability of replacing the furnace hearth brick lining of the blast furnace hearth provided by the invention is lower, the service life of the furnace hearth is longer, and the overall benefit of an enterprise is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a blast furnace hearth in the present application;
fig. 2 is a schematic view of the connection structure of the slab block and the panel wall in the present application;
fig. 3 is a structural diagram of the first passage provided on the annular block in the present application.
In the figure:
1-a cylinder body; 11-furnace shell; 12-hearth staves; 13-blast furnace base; 14-blast furnace foundation pier; 15-furnace belly brick lining; 16-tuyere; 17-hearth brick lining; 18-microporous carbon brick; 19-elephant foot area;
2-boss; 21-an annular block; 22-plate-shaped block; 23-siding; 24-an enclosing wall; 241-lower section; 242 — an upper section;
3-ceramic tile; 31-a first wall; 32-a second enclosure wall; 33-floor;
4-ring-shaped molten iron channel;
5-tapping hole;
6-a first channel; 61-a first water inlet; 62-a first water outlet;
7-a second channel; 71-a second water inlet; 72-a second water outlet;
8, overhauling a channel;
9-stacking.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
the embodiment provides a blast furnace hearth for solving the technical problems that the temperature of a thermocouple of the blast furnace hearth is suddenly increased and the temperature difference of a cooling wall of the hearth is increased in the prior art.
Specifically, from the investigation of the hearth damage of a large-scale blast furnace, it is found that the hearth side wall mainly comprises the elephant foot area 19 at the lower part of the taphole, the erosion of the ceramic pad at the central part of the furnace bottom is light, the ceramic pad at the uppermost layer is basically intact, and the phenomenon of molten iron erosion is almost avoided, which is contrary to the theoretical dead coke pile 'floating' and 'sinking' theory of the blast furnace. The analysis considers that: because the large-scale blast furnace adopts the multiple tapholes for tapping in turn, the generated molten iron and slag can flow to the taphole for tapping along the side wall of the hearth, and a relatively fixed molten iron circulation channel is formed on the side wall of the hearth, and the molten iron channel is a slag iron storage area of the hearth. The blast kinetic energy of the large blast furnace is not increased in the same proportion due to the increase of the diameter of the hearth, the dead coke pile at the central part of the hearth is larger than that of the small blast furnace, and molten iron can hardly penetrate through the center of the dead coke pile. In addition, the large blast furnace can not form a fixed iron slag storage area at the furnace bottom like a single iron notch, a medium blast furnace and a small blast furnace which are discontinuously tapped, the phenomena of 'floating' and 'sinking' of dead coke piles occur, and the corrosion of the 'pot bottom' like a medium blast furnace and a small blast furnace does not exist.
From the tuyere coke extraction and sample analysis, it can also be seen that there is significant particle size segregation of the coke between the dead coke heap and the tuyere raceway. Analysis shows that most coke in the central part of the furnace burden is consumed through melting and oxidation-reduction reaction, and small coke, coke ash, part of slag iron and the like which do not participate in the reaction or do not react enter a central dead coke pile; the slag iron dropping from the soft melting zone is heated, melted and reduced by the glowing coke bed, most of the slag iron enters the slag iron storage area of the furnace hearth through the tuyere raceway, and part of the slag iron drops to the surface of the dead coke pile, slides along the surface of the dead coke pile and enters the slag iron storage area of the furnace hearth, so that a hard slag iron shell crust is formed on the surface of the dead coke pile. When the coke is taken from the tuyere, the instantaneous resistance is increased after the sampling rod passes through the tuyere raceway, the existence condition of the slag iron shell can be judged, and the length of the tuyere raceway can be determined accordingly.
Because the large blast furnace generally adopts the alternative tapping and the continuous tapping of a plurality of tapholes, the flow velocity of molten iron at the taphole part is relatively small, and a large amount of slag iron generated at the taphole at the end of tapping, particularly at the opposite side of the taphole, can flow to the taphole along a slag iron storage area formed by the bottom of a dead coke stack and a elephant foot area 19 at the edge of a hearth; wherein, part of molten iron can scour the dead coke pile on the inner side and flow along the bottom of the dead coke pile to scour a hard shell at the bottom of the dead coke pile and erode the dead coke pile charging, and the lower part of the dead coke pile can be hollowed in the past, finally the partial collapse of the dead coke pile or the overturning of the whole dead coke pile is caused, the formed molten iron channel is blocked, and the slag iron flow is redirected. When the molten iron flow is rerouted to wash the brick lining which is corroded seriously, the thermocouple temperature and the temperature difference of inlet and outlet water of the cooling wall at the position can change obviously and the position can be burnt out seriously.
The blast furnace hearth comprises a cylinder body 1, a boss 2 and ceramic bricks 3, wherein the cylinder body 1 is provided with a cylinder bottom and a elephant foot area 19, the elephant foot area 19 is positioned at the joint position of the cylinder bottom and the side wall of the cylinder body 1, the boss 2 is arranged in the middle of the bottom of the cylinder body 1, optimally, the boss 2 is arranged at the center position of the bottom of the cylinder body 1, a cooling channel is arranged inside the boss 2 and used for reducing the temperature of the boss 2, the ceramic bricks 3 are built on the outer side wall of the lower part of the boss 2 to form a first surrounding wall 31, the ceramic bricks 3 are built on the elephant foot area 19 of the cylinder body 1 to form a second surrounding wall 32, the ceramic bricks 3 are built on the cylinder bottom of the cylinder body 1 to form a floor 33, a ring-shaped molten iron channel 4 is formed among the first surrounding wall 31, the second surrounding wall 32 and the floor 33, an iron outlet 5 is arranged on the side wall of the cylinder body 1, and the iron outlet 5 is positioned above the ring-shaped molten iron channel 4.
By adopting the structure, the cylinder body 1 of the blast furnace hearth provided by the embodiment contains molten iron, when the molten iron enters the cylinder body 1, the molten iron can flow out from the tapping hole 5, the boss 2 is in a structure with a small upper part and a large lower part or an upper part and a lower part with equal diameter and is arranged at the central position of the bottom of the cylinder body 1, and optimally, the boss 2 is in a structure with a small upper part and a lower part, so that furnace burden is distributed around the boss 2 through the diversion effect of the boss 2 after entering the cylinder body 1, and the boss 2 cooled by the cooling channel can accelerate the chemical reaction of the furnace burden, so that a hard and corrosion-resistant protective layer is formed on the surface of the boss 2 to protect the boss 2, and the annular molten iron channel 4 can strengthen the formation of molten iron circulation, so as to facilitate the quick replacement of iron slag flow and dead coke piles, reduce the influence of the dead coke piles on the molten iron circulation, and facilitate the discharge of the molten iron and the slag iron. Because the circulation of the molten iron is strengthened, the circulation of the molten iron cannot change the path in the flowing process of the molten iron, and further the brick lining of the ceramic brick 3 cannot be washed, so the temperature of the thermocouple at the position is suddenly increased, the water temperature difference of the cooling wall 12 of the hearth is increased at a lower probability, and the influence of the overturning and the caving of the dead coke heap on the brick lining of the cylinder body 1 and the brick lining of the cylinder bottom can be reduced, therefore, the probability of replacing the brick lining 17 of the hearth of the blast furnace hearth provided by the invention is lower, the service life of the hearth is longer, and the overall benefit of an enterprise is improved. The ceramic tiles 3 in this embodiment have an erosion resistant effect, protecting the lower part of the boss 2. And the lug boss 2 can enable the burden to uniformly fall in the annular molten iron channel 4 and be consumed by the molten iron.
It should be noted that the cylinder body 1 in this embodiment includes a furnace shell 11, a hearth cooling wall 12, a blast furnace hearth 13, a blast furnace hearth pier 14, a hearth brick lining 15, a tuyere 16, a hearth brick lining 17 and a bottom layer built by microporous carbon bricks 18, and since the parts of the cylinder body 1 are the same as those in the prior art, detailed description thereof is omitted here.
As an embodiment of this embodiment, the height of the annular molten iron passageway 4 in this embodiment is 2m to 2.5m, such as 2m, 2.1m, 2.2m, and 2.3m, and the vertical distance between the taphole 5 and the annular molten iron passageway 4 is 1.5m to 3m, such as 1.5m, 2m, and 3 m. Thus, the molten iron and the iron slag can be more conveniently discharged from the tap hole 5.
As an embodiment of the present embodiment, the boss 2 of the present embodiment includes an annular block 21, a plate-shaped block 22, and a surrounding wall 24 and a plate wall 23 which are made of firebricks, wherein one end of the annular block 21 is made or embedded in the bottom of the cylinder block 1, the surrounding wall 24 is provided around the annular block 21, the first surrounding wall 31 is provided around the surrounding wall 24, the surrounding wall 24 and the annular block 21 constitute a platform, the plate-shaped block 22 is laid on and fixed to the floor of the platform, and the plate wall 23 is made on the upper surface of the plate-shaped block 22. Like this, can make the structure of boss 2 more firm, the cooling channel includes first passageway 6 and second passageway 7, and first passageway 6 and second passageway 7 set up respectively in above-mentioned annular block 21 and slabby block 22 to lower the temperature to boss 2, so that carry out the chemical reaction with the furnace charge that meets with boss 2 surface more fast and form the protective layer that protects boss 2. The plate wall 23 can support descending burden materials, when the burden materials are accumulated more, a cone-shaped burden pile 9 is formed above the plate wall 23 to divide the burden materials, so that the burden materials uniformly enter the annular molten iron channel 4 and are consumed by molten iron.
In a more preferred embodiment of the present invention, the enclosing wall 24 surrounding the ring-shaped block includes a lower section 241 having a straight cylindrical shape and an upper section 242 having a tapered shape, the lower section 241 and the upper section 242 are coaxially disposed, the bottom end of the lower section 241 is built or embedded in the bottom of the furnace, the tapered bottom end of the upper section 242 is built with the top end of the lower section 241, and the plate-shaped block 22 is disposed at the tapered top end of the upper section 242. The first wall 31 surrounds the lower section 241, and the outer surface of the first wall 31 is flush with the outer edge of the conical bottom of the upper section 242. In this way, in combination with the conical material pile 9, the descending burden material can be better divided, so that the burden material can more uniformly fall into the annular molten iron channel.
As a specific implementation manner of this embodiment, in this embodiment, the refractory bricks used for building the lower section 241 are NMA bricks, which have good high temperature resistance and thermal conductivity, so as to facilitate heat transfer between the charging materials of the plate-shaped blocks 22, thereby reducing the charging temperature. Since the ceramic tiles 3 are arranged on the periphery of the lower section 241, the circulation of molten iron and the erosion of iron slag to the lower section 241 can be avoided. The NMA brick masonry mode of the lower section 241 is the same as the masonry mode of the original blast furnace hearth brick lining 17.
As a specific implementation manner of this embodiment, the refractory bricks of the upper section 242 in this embodiment include NMD bricks and NMA bricks, wherein the NMA bricks are laid to form a first brick wall, the NMD bricks are laid to form a second brick wall, and the first brick wall is located between the second brick wall and the annular block 21, so that the slag-iron corrosion resistance of the NMD bricks can be utilized to protect the upper section 242 and the first brick wall, and the good thermal conductivity of the NMA bricks is utilized to perform heat transfer between the annular block 21 and the burden on the surface thereof. It should be noted that in this embodiment, an embedded transition is used between the first brick wall and the second brick wall.
As a more specific implementation manner of this embodiment, the thickness of the lower section 241 of the enclosing wall 24 in this embodiment is 800-1000mm, such as 800mm, 900mm, 1000mm, so as to form a stable enclosing wall 24 structure, and the thicknesses of the first brick wall and the second brick wall are the same.
As a more preferable embodiment of this embodiment, the refractory bricks of the panel wall 23 in this embodiment are NMA bricks, and the panel wall 23 is embedded, that is, an embedded groove is formed on the upper surface of the plate-shaped block 22, and a part of the NMA bricks are embedded in the embedded groove, so that a tooth-groove structure can be formed on the upper surface of the panel wall 23, so as to facilitate the accumulation of the furnace burden 9 into the burden heap 9.
It should be noted that the mud jacking operation is adopted among the plate wall 23, the plate-shaped block 22, the enclosing wall 24, the first enclosing wall 31 and the ring-shaped block 21 in the embodiment, so that the plate wall 23, the plate-shaped block 22, the enclosing wall 24, the first enclosing wall 31 and the ring-shaped block 21 are in close and effective contact, air holes are reduced, air leakage is prevented, the thermal conductivity and the working efficiency of the plate-shaped block 22 and the ring-shaped block 21 are improved, and the service life of the cylinder body 1 is prolonged.
As a more preferable embodiment of the present embodiment, a service passage 8 is opened at a center position of a cylinder bottom of the cylinder block 1 in the present embodiment, and the service passage 8 communicates with an inner hole of the annular block 21. It should be noted that the access passage 8 in this embodiment actually runs through the bottom layer of the start of the microporous carbon brick 18 at the bottom of the cylinder body 1, the blast furnace foundation 13 and the blast furnace foundation pier 14, the access passage 8 can be used for detecting signal transmission, ventilation, illumination, access of maintainers and the like, monitoring facilities such as a plurality of thermocouples are installed on the side wall of the space between the annular block 21 and the plate-shaped block 22, maintenance is performed according to the use requirements of the existing blast furnace hearth, and the access passage is coordinated and effectively matched with the maintenance measures of the hearth, so as to monitor the working condition of the device in real time and assist the normal operation of the blast furnace production. The maintainer can get into the space between the annular block 21 and the plate block 22 from the access passage 8 to check and monitor the working condition of the thermocouple, and the access passage 8 can also get in and out the cooling water, the first passage 6 and the second passage 7 are both communicated with the access passage 8, thus, the cooling water can get into the first passage 6 and the second passage 7, specifically, the first passage 6 is provided with a first water inlet 61 and a first water outlet 62 in a communicating manner, the second passage 7 is provided with a second water inlet 71 and a second water outlet 72 in a communicating manner, the first water inlet 61, the first water outlet 62, the second water inlet 71 and the second water outlet 72 are all communicated with the access passage 8, namely, the first passage 6 and the second passage 7 can get in and out the cooling water independently, thereby the cooling strength of the plate block 22 and the annular block 21 can be controlled conveniently.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A blast furnace hearth, comprising:
the cylinder body comprises a elephant foot area positioned at the joint of the cylinder bottom of the cylinder body and the side wall of the cylinder body;
the cooling device comprises a cylinder body, a boss, a cooling channel and a cooling channel, wherein the boss is large in upper part and small in lower part or is equal in diameter in upper part and lower part, the boss is internally provided with the cooling channel, and the boss is arranged in the middle of the bottom of the cylinder body;
the ceramic tile is laid on the outer side wall of the lower part of the boss to form a first surrounding wall, the ceramic tile is laid on the elephant foot area of the cylinder body to form a second surrounding wall, the ceramic tile is laid on the bottom of the cylinder body to form a floor, and the first surrounding wall, the floor and the second surrounding wall form an annular molten iron channel;
and a taphole is arranged on the side wall of the cylinder body and is positioned above the annular molten iron channel.
2. A blast furnace hearth according to claim 1, wherein: the height of the annular molten iron channel is 2m-2.5m, and the vertical distance between the tapping hole and the annular molten iron channel is 1.5m-3 m.
3. The blast furnace hearth of claim 1, wherein said boss comprises:
one end of the annular block body is fixedly connected to the cylinder bottom of the cylinder body;
a plate-like block body;
the first enclosure wall surrounds the enclosure wall, the plate-shaped blocks are laid on the table top of the platform, and the plate wall is laid on the upper surfaces of the plate-shaped blocks;
the cooling channel comprises a first channel and a second channel, and the first channel and the second channel are respectively arranged in the annular block body and the plate-shaped block body.
4. A blast furnace hearth according to claim 3, wherein said enclosure comprises:
the bottom end of the lower section is fixedly connected with the cylinder bottom of the cylinder body;
the conical bottom end of the upper section is connected with the top end of the lower section, the upper section and the lower section are coaxial, and the plate-shaped block body is laid at the conical top end of the upper section;
the first surrounding wall surrounds the lower section, and the outer surface of the first surrounding wall is flush with the outer edge of the conical bottom end of the upper section.
5. The blast furnace hearth of claim 4, wherein: the refractory bricks of the lower section are NMA bricks.
6. A blast furnace hearth according to claim 5, wherein: the refractory bricks of the upper section comprise NMD bricks and NMA bricks, the NMA bricks are laid to form a first brick wall, the NMD bricks are laid to form a second brick wall, and the first brick wall is located between the second brick wall and the annular blocks.
7. The blast furnace hearth of claim 6, wherein: the thickness of the lower section is 800-1000mm, and the thicknesses of the first brick wall and the second brick wall are the same.
8. A blast furnace hearth according to claim 3, wherein: the firebricks of the plate wall are NMA bricks, and the plate wall is built in an embedded mode.
9. A blast furnace hearth according to any one of claims 3 to 8, wherein: the center of the bottom of the cylinder body is provided with an overhaul channel, and the overhaul channel is communicated with an inner hole of the annular block body.
10. A blast furnace hearth according to claim 9, wherein: the first channel is provided with a first water inlet and a first water outlet, the second channel is provided with a second water inlet and a second water outlet, and the first water inlet, the first water outlet, the second water inlet and the second water outlet are communicated with the overhaul channel.
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| CN202110264614.0A CN113136469B (en) | 2021-03-11 | 2021-03-11 | Blast furnace hearth |
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