CN116162761B - System and method for safe and long-service life of direct-current arc furnace bottom blowing electrode - Google Patents
System and method for safe and long-service life of direct-current arc furnace bottom blowing electrodeInfo
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- CN116162761B CN116162761B CN202310095684.7A CN202310095684A CN116162761B CN 116162761 B CN116162761 B CN 116162761B CN 202310095684 A CN202310095684 A CN 202310095684A CN 116162761 B CN116162761 B CN 116162761B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5229—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5229—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace
- C21C2005/5235—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace with bottom electrodes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C2005/5288—Measuring or sampling devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention relates to a system and a method for safe and long-service life of bottom blowing electrodes of a direct current arc furnace, wherein the bottom blowing electrodes are divided into more than two groups, one group is in a bottom blowing powder spraying mode, carrier gas-powder is sprayed to a molten pool, the other groups are in a pure gas spraying mode, in the smelting process, after one group of bottom blowing electrodes reach an early warning position, the bottom blowing powder spraying mode is switched into the pure gas spraying mode, and meanwhile, the next group of bottom blowing electrodes are switched into the bottom blowing powder spraying mode from the pure gas spraying mode, so that the on-line switching of smelting tasks of the two groups of bottom blowing electrodes is realized, and the smelting process is pushed until the furnace service is finished. And capillary tubes are pre-buried in each bottom blowing electrode as an early warning device for early warning of corrosion and abrasion of the bottom blowing electrode so as to achieve the aim of safe production. The invention can monitor the erosion condition of the bottom blowing electrode in real time, ensures the stability and the long service life of the bottom blowing electrode system, and achieves the synchronization with the furnace age.
Description
Technical Field
The invention belongs to the field of steelmaking, and relates to a system and a method for safe and long-service life of a blowing electrode at the bottom of a direct current arc furnace.
Background
The direct current arc furnace is one of the methods for electric arc furnace steelmaking, uses the top graphite electrode as a cathode and uses the bottom electrode as an anode for smelting, and has a series of superiorities in capital, equipment, environmental protection and operation results compared with the alternating current arc furnace. In the bottom electrode format, there are usually air-cooled multi-stylus, rod-like water-cooled, steel sheet type, and the like.
The air-cooled needle-shaped bottom electrode is widely applied to the steelmaking process of a modern direct current arc furnace by the characteristics of safety, reliability and long service life. On the basis, students develop a direct-current bottom electrode bottom blowing multi-element medium technology, and the aims of accelerating production rhythm and reducing raw and auxiliary material consumption are achieved by designing the bottom electrode to be hollow and blowing multi-element mediums such as carrier gas, powder and the like into a molten pool through the hollow bottom electrode in the smelting process.
However, in the process of conveying powder into a molten pool through a hollow bottom electrode, on one hand, the bottom refractory material is eroded to cause the furnace bottom to descend, and the bottom electrode is consumed along with the furnace bottom, on the other hand, the bottom electrode is invalid due to the harm of erosion and abrasion to the inner wall of the bottom electrode, the service life of the bottom blowing electrode is reduced, and finally the furnace life is reduced, so that the production is seriously influenced.
Therefore, how to prolong the service life of the bottom blowing electrode system and develop a set of safe and reliable bottom blowing electrode system is the key of the bottom blowing multi-element medium of the bottom electrode of the direct current arc furnace towards industrialized application.
Disclosure of Invention
In view of the above, the invention aims to provide a safe and long-life service system and method for a bottom blowing electrode of a direct current arc furnace, which solve the defects of the current bottom blowing electrode system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A safe and long-service system of a direct-current arc furnace bottom blowing electrode comprises a control system, a bottom blowing carrier gas-powder device, a bottom blowing gas control valve group and more than two groups of bottom blowing electrodes positioned at the furnace bottom, wherein each group of bottom blowing electrodes comprises more than one bottom blowing electrode, each bottom blowing electrode is provided with a through hollow hole, the bottom blowing carrier gas-powder device is communicated with the hollow holes of the bottom blowing electrodes through a bottom blowing powder distribution device and a bottom blowing powder control cut-off valve in sequence, the bottom blowing gas control valve group is communicated with the hollow holes of the bottom blowing electrodes through the bottom blowing gas distribution device and the bottom blowing gas control cut-off valve in sequence, the bottom blowing gas control cut-off valve and the bottom blowing gas control cut-off valve are in one-to-one correspondence with each group of bottom blowing electrodes, the bottom blowing carrier gas-powder device, the bottom blowing powder distribution device and the bottom blowing gas control cut-off valve are in signal connection with the control system, and an early warning device is arranged on each bottom blowing electrode and is in signal connection with the control system.
Further, the early warning device comprises a capillary, capillary outlets are embedded in the bottom blowing electrode at different inner diameters and different heights, and capillary inlets are connected with the bottom blowing gas control valve group.
Further, the depth of embedding the capillary in the bottom blowing electrode gradually decreases with increasing radial distance between the capillary and the center of the bottom blowing electrode.
Further, the diameter of the bottom blowing electrode is D, the length of the bottom blowing electrode is H, the distance between the center of the capillary and the center of the bottom blowing electrode is 0.1D-0.4D, and the embedding depth is 0.3H-0.7H.
Further, the number of capillaries embedded in each bottom blowing electrode is more than two.
Further, the capillary is a metal capillary.
Further, a powder gas conveying pipe is arranged in the hollow hole of the bottom blowing electrode, and the powder gas conveying pipe is communicated with the bottom blowing carrier gas-powder device and the bottom blowing gas control valve group.
The safe and long-life service method of the direct-current arc furnace bottom blowing electrode adopts the safe and long-life service system of the direct-current arc furnace bottom blowing electrode, and comprises the following steps:
S1, when smelting starts, a 1 st group of bottom blowing electrodes are in a bottom blowing powder injection mode, and the rest groups of bottom blowing electrodes are in a pure gas injection mode so as to perform smelting, wherein the bottom blowing powder injection control cut-off valves corresponding to the 1 st group of bottom blowing electrodes are opened, the rest bottom blowing powder injection control cut-off valves are closed, and the bottom blowing carrier gas-powder device conveys carrier gas-powder and is sprayed into a molten pool through the 1 st group of bottom blowing electrodes after being distributed through a bottom blowing powder distribution device;
S2, after an early warning device of a certain bottom blowing electrode in the 1 st group of bottom blowing electrodes recognizes that the bottom blowing electrode reaches an early warning position, a control system sends an instruction, a bottom blowing powder injection control cut-off valve corresponding to the 1 st group of bottom blowing electrodes is closed, a bottom blowing gas control cut-off valve is opened, the 1 st group of bottom blowing electrodes is switched from a bottom blowing powder injection mode to a pure gas injection mode, pure gas is injected into a molten pool, meanwhile, a bottom blowing powder injection control cut-off valve corresponding to the 2 nd group of bottom blowing electrodes is opened, the bottom blowing gas control cut-off valve is closed, the 2 nd group of bottom blowing electrodes is switched from the pure gas injection mode to the bottom blowing powder injection mode, carrier gas-powder is injected into a molten pool, and accordingly, the on-line switching of smelting tasks of the two groups of bottom blowing electrodes is realized;
s3, carrying out on-line switching of the smelting tasks of the next group of bottom blowing electrodes in sequence along with the smelting, and ending the furnace service.
Further, when the system for safe and long-life service of the bottom blowing electrode of the direct current arc furnace according to claim 2 is adopted, a certain bottom blowing electrode in service is eroded to a certain height position or worn to a certain radial position, namely, reaches an early warning position, a capillary tube pre-buried in the position is ventilated, a bottom blowing gas control valve group detects gas flow information, the control system is combined with a pre-buried position database of the capillary tube in the earlier stage, the erosion height or the wearing position of the bottom blowing electrode is automatically detected, and when the bottom blowing electrode reaches the early warning position, replacement or furnace offline treatment is required.
Further, all bottom blowing electrodes in each group blow carrier gas-powder of different media into the molten pool.
The invention has the beneficial effects that:
(1) According to the application, more than two groups of bottom blowing electrodes are arranged on the furnace bottom, and after a single bottom blowing electrode reaches an early warning position, the bottom blowing powder spraying mode can be switched into a pure gas spraying mode in real time, so that the smelting tasks of the next group of bottom blowing electrodes are switched on line in sequence, the stability and the long service life of a bottom blowing electrode system are ensured, and the synchronization with the furnace age is achieved.
(2) According to the invention, the capillary is pre-buried in the bottom blowing electrode, so that the erosion and abrasion conditions of the bottom blowing electrode are monitored in real time, and the safety of a bottom blowing electrode system is effectively protected.
(3) The gas enters the molten steel through the hollow holes of the bottom blowing electrode, absorbs the surplus heat energy of the bottom blowing electrode, can replace the traditional bottom electrode air cooling mode, and discharges the heat out of the furnace, so that the surplus energy is efficiently utilized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a safe and long-life system for a DC arc furnace bottom blowing electrode according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the bottom blowing electrode in embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional view of a bottom-blowing electrode arrangement in embodiment 1 of the present invention.
The device comprises a bottom blowing carrier gas-powder device 1, a bottom blowing powder spraying distribution device 2, a bottom blowing powder spraying control cut-off valve 3, a bottom blowing gas control valve group 4, a bottom blowing gas distribution device 5, a bottom blowing gas control cut-off valve 6, a bottom blowing electrode 7, a powder gas conveying pipe 7-1, a metal capillary tube 7-2 and a control system 8.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
In which the drawings are for illustrative purposes only and are not intended to be construed as limiting the invention, and in which certain elements of the drawings may be omitted, enlarged or reduced in order to better illustrate embodiments of the invention, and not to represent actual product dimensions, it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must have a specific direction, be constructed and operated in a specific direction, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present invention, and that the specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1:
Referring to fig. 1-3, the system is a safe and long-service-life system of a direct current arc furnace bottom blowing electrode 7, and is applied to a 100t direct current arc furnace, and comprises a control system 8, a bottom blowing carrier gas-powder device, a bottom blowing gas control valve group 4 and three groups of bottom blowing electrodes 7 positioned at the furnace bottom, wherein each group of bottom blowing electrodes 7 comprises 12 bottom blowing electrodes 7, each bottom blowing electrode 7 is provided with a through hollow hole (the other bottom blowing electrodes of the furnace bottom are bottom electrodes without hollow holes and do not participate in the bottom blowing process), the diameter D of the bottom blowing electrode 7 is 50mm, the length H is 400mm, and the aperture of the hollow hole is 6mm.
2 Metal capillaries 7-2 are pre-buried in each bottom blowing electrode 7 as an early warning device, outlets of the 2 metal capillaries 7-2 are pre-buried at different inner diameters and different heights in the bottom blowing electrodes 7, the embedding depth of the metal capillaries 7-2 in the bottom blowing electrodes 7 is gradually reduced along with the increase of the radial distance between the metal capillaries 7-2 and the center of the bottom blowing electrodes 7, and an inlet of the metal capillaries 7-2 is connected with the bottom blowing gas control valve group 4. Specifically, the outlet of the 1 st metal capillary tube 7-2 is positioned on the circle with the diameter of 14mm of the bottom blowing electrode 7, the embedding depth is 200mm and is used for early warning of abrasion of the bottom blowing electrode 7, the outlet of the 2 nd metal capillary tube 7-2 is positioned on the circle with the diameter of 30mm of the bottom blowing electrode 7, and the embedding depth is 300mm and is used for warning of erosion of the bottom blowing electrode 7.
The bottom blowing carrier gas-powder device is communicated with the hollow holes of the bottom blowing electrodes 7 sequentially through the bottom blowing powder distribution device 2 and the bottom blowing powder control cut-off valve 3, the bottom blowing gas control valve bank 4 is communicated with the hollow holes of the bottom blowing electrodes 7 sequentially through the bottom blowing gas distribution device 5 and the bottom blowing gas control cut-off valve 6, the bottom blowing powder control cut-off valve 3 and the bottom blowing gas control cut-off valve 6 are in one-to-one correspondence with each group of the bottom blowing electrodes 7, the bottom blowing carrier gas-powder device, the bottom blowing powder distribution device 2 and the bottom blowing powder control cut-off valve 3, the bottom blowing gas control valve bank 4, the bottom blowing gas distribution device 5 and the bottom blowing gas control cut-off valve 6 are in signal connection with the control system 8, and an early warning device is arranged on each bottom blowing electrode 7 and in signal connection with the control system 8.
The powder gas conveying pipe 7-1 is arranged in the hollow hole of the bottom blowing electrode 7, and the powder gas conveying pipe 7-1 is communicated with the bottom blowing carrier gas-powder device and the bottom blowing gas control valve group 4.
The safe and long-service-life method of the direct-current arc furnace bottom blowing electrode 7 corresponding to the system comprises the following steps:
S1, when smelting starts, a1 st group of bottom blowing electrodes 7 are in a bottom blowing powder injection mode, the rest groups of bottom blowing electrodes 7 are in a pure gas injection mode so as to carry out tasks such as carburetion, dephosphorization, stirring and the like, specifically, a1 st group of bottom blowing electrodes 7 correspond to a bottom blowing powder control cut-off valve 3-1 is opened, the rest groups of bottom blowing powder control cut-off valves (the bottom blowing powder control cut-off valve 3-2 and the bottom blowing powder control cut-off valve 3-3) are closed, a bottom blowing carrier gas-powder device conveys carrier gas-powder, after the carrier gas-powder is distributed by a bottom blowing powder distribution device 2, air-carbon powder is injected into a molten pool through 6 bottom blowing electrodes 7 in the 1 st group of bottom blowing electrodes 7, and O 2-CO2 -lime powder is injected into the molten pool through the other 6 bottom blowing electrodes 7, meanwhile, the rest groups of bottom blowing gas control cut-off valves (the bottom blowing powder control cut-off valves 6-2 and the bottom blowing powder control cut-off valve 6-3) are opened, and the rest groups of bottom blowing gas control cut-off valves 7 are distributed into the molten pool through the bottom blowing gas control valve 5;
S2, when the number of smelting furnaces reaches 230, an early warning device of a certain bottom blowing electrode 7 in the 1 st group of bottom blowing electrodes 7 recognizes that the bottom blowing electrode 7 reaches an early warning position, a control system 8 sends out an instruction, a bottom blowing powder injection control cut-off valve 3-1 corresponding to the 1 st group of bottom blowing electrodes 7 is closed, a bottom blowing gas control cut-off valve 6-1 is opened, the 1 st group of bottom blowing electrodes 7 is switched from a bottom blowing powder injection mode to a pure gas injection mode to inject pure gas into a molten pool, meanwhile, a bottom blowing powder injection control cut-off valve 3-2 corresponding to the 2 nd group of bottom blowing electrodes 7 is opened, the bottom blowing gas control cut-off valve 6-2 is closed, and the 2 nd group of bottom blowing electrodes 7 are switched from the pure gas injection mode to the bottom blowing powder injection mode to inject carrier gas-powder into the molten pool, so that the on-line switching of smelting tasks of the two groups of bottom blowing electrodes 7 is realized;
The early warning process comprises that when a certain bottom blowing electrode 7 in service is corroded to a certain height position or worn to a certain radial position, the metal capillary 7-2 pre-buried in the position reaches an early warning position, the bottom blowing gas control valve group 4 detects gas flow information, and the control system 8 is combined with a pre-buried position database of the metal capillary 7-2 to automatically detect the corrosion height or the wearing position of the bottom blowing electrode 7;
S3, along with smelting, when the number of smelting furnaces reaches 475 furnaces, the group 2 bottom blowing electrodes 7 are switched to the group 3 bottom blowing electrodes 7 on line after reaching the early warning position, and when the service of the group 3 bottom blowing electrodes 7 is finished, the number of smelting furnaces reaches 760 furnaces.
Example 2:
The invention is applied to a 150t direct current arc furnace, the bottom blowing electrodes 7 are divided into 4 groups, each group comprises 15 bottom blowing electrodes 7, the diameter D of the bottom blowing electrodes 7 is 50mm, the length H is 450mm, and the aperture of the hollow holes is 8mm.
3 Metal capillaries 7-2 are pre-buried in each bottom blowing electrode 7, the 1 st metal capillary 7-2 is positioned on the circle with the diameter of 15mm of the bottom blowing electrode 7, the burying depth is 350mm and used for early warning of abrasion of the bottom blowing electrode 7, the 2 nd metal capillary 7-2 is positioned on the circle with the diameter of 25mm of the bottom blowing electrode 7, the burying depth is 300mm and used for warning of abrasion of the bottom blowing electrode 7, and the 3 rd metal capillary 7-2 is positioned on the circle with the diameter of 30mm of the bottom blowing electrode 7, the burying depth is 150mm and used for warning of erosion of the bottom blowing electrode 7.
The safe and long-service-life method of the direct-current arc furnace bottom blowing electrode 7 corresponding to the system comprises the following steps:
S1, when smelting starts, a 1 st group of bottom blowing electrodes 7 are in a bottom blowing powder injection mode, the rest groups of bottom blowing electrodes 7 are in a pure gas injection mode so as to carry out tasks such as carburetion, dephosphorization, stirring and the like, specifically, a 1 st group of bottom blowing powder injection control cut-off valves 3-1 corresponding to the bottom blowing electrodes 7 are opened, the rest bottom blowing powder injection control cut-off valves are closed, a bottom blowing carrier gas-powder device conveys carrier gas-powder, after being distributed by a bottom blowing powder injection distribution device 2, air-carbon powder is injected into a molten pool through 6 bottom blowing electrodes 7 in the 1 st group of bottom blowing electrodes 7, and O 2-CO2 -lime powder is injected into the molten pool through 9 other bottom blowing electrodes 7, meanwhile, the rest bottom blowing gas control cut-off valves corresponding to the 1 st group of bottom blowing electrodes 7 are closed, and the rest bottom blowing gas control cut-off valves are opened, and the rest groups of bottom blowing electrodes 7 are used for injecting pure gas (N 2-Ar-CO2) into the molten pool through a bottom blowing gas distribution device 5;
S2, when the number of smelting furnaces reaches 185 furnaces, an early warning device of a certain bottom blowing electrode 7 in the 1 st group of bottom blowing electrodes 7 recognizes that the bottom blowing electrode 7 reaches an early warning position, a control system 8 sends out an instruction, a bottom blowing powder injection control cut-off valve 3-1 corresponding to the 1 st group of bottom blowing electrodes 7 is closed, a bottom blowing gas control cut-off valve 6-1 is opened, the 1 st group of bottom blowing electrodes 7 is switched from a bottom blowing powder injection mode to a pure gas injection mode to inject pure gas into a molten pool, meanwhile, a bottom blowing powder injection control cut-off valve 3-2 corresponding to the 2 nd group of bottom blowing electrodes 7 is opened, the bottom blowing gas control cut-off valve 6-2 is closed, and the 2 nd group of bottom blowing electrodes 7 are switched from the pure gas injection mode to the bottom blowing powder injection mode to inject carrier gas-powder into the molten pool, so that the on-line switching of smelting tasks of the two groups of bottom blowing electrodes 7 is realized;
The early warning process comprises that when a certain bottom blowing electrode 7 in service is corroded to a certain height position or worn to a certain radial position, the metal capillary 7-2 pre-buried in the position reaches an early warning position, the bottom blowing gas control valve group 4 detects gas flow information, and the control system 8 is combined with a pre-buried position database of the metal capillary 7-2 to automatically detect the corrosion height or the wearing position of the bottom blowing electrode 7;
S3, with the smelting, when the number of smelting furnaces reaches 430 furnaces, the group 2 bottom blowing electrodes 7 are switched to the group 3 bottom blowing electrodes 7 on line after reaching the early warning position, when the number of smelting furnaces reaches 640 furnaces, the group 3 bottom blowing electrodes 7 are switched to the group 4 bottom blowing electrodes 7 on line after reaching the early warning position, and when the service of the group 4 bottom blowing electrodes 7 is finished, the number of smelting furnaces reaches 850 furnaces.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (8)
1. The safe and long-service system for the bottom blowing electrode of the direct-current arc furnace is characterized by comprising a control system, a bottom blowing carrier gas-powder device, a bottom blowing gas control valve group and more than two groups of bottom blowing electrodes positioned at the bottom of the furnace, wherein each group of bottom blowing electrodes comprises more than one bottom blowing electrode, and the bottom blowing electrodes are provided with through hollow holes; the bottom blowing carrier gas-powder device is communicated with the bottom blowing electrode hollow holes sequentially through the bottom blowing powder distribution device and the bottom blowing powder control cut-off valve, the bottom blowing gas control valve bank is communicated with the bottom blowing electrode hollow holes sequentially through the bottom blowing gas distribution device and the bottom blowing gas control cut-off valve, the bottom blowing powder control cut-off valve and the bottom blowing gas control cut-off valve are in one-to-one correspondence with each group of bottom blowing electrodes;
The early warning device comprises a capillary, wherein capillary outlets are embedded at different inner diameters and different heights in the bottom blowing electrode, a capillary inlet is connected with a bottom blowing gas control valve group, and the embedding depth of the capillary in the bottom blowing electrode is gradually reduced along with the increase of the radial distance between the capillary and the center of the bottom blowing electrode.
2. The system for safe and long-service life of a bottom blowing electrode of a direct current arc furnace of claim 1, wherein the diameter of the bottom blowing electrode is D, the length of the bottom blowing electrode is H, the distance between the center of a capillary and the center of the bottom blowing electrode is 0.1D-0.4D, and the embedding depth is 0.3H-0.7H.
3. The system for safe and long-service life of the bottom blowing electrode of the direct current arc furnace of claim 1, wherein the number of capillaries embedded in each bottom blowing electrode is more than two.
4. The system for safe and long-life service of a direct current arc furnace bottom blowing electrode according to claim 1, wherein the capillary is a metal capillary.
5. The system for safe and long-service life of the bottom blowing electrode of the direct current arc furnace of claim 1, wherein a powder gas conveying pipe is arranged in a hollow hole of the bottom blowing electrode, and the powder gas conveying pipe is communicated with a bottom blowing carrier gas-powder device and a bottom blowing gas control valve group.
6. A method for safe and long-life service of a direct-current arc furnace bottom blowing electrode is characterized in that the safe and long-life service system of the direct-current arc furnace bottom blowing electrode according to any one of claims 1-5 is adopted and comprises the following steps:
S1, when smelting starts, a 1 st group of bottom blowing electrodes are in a bottom blowing powder injection mode, and the rest groups of bottom blowing electrodes are in a pure gas injection mode so as to perform smelting, wherein the bottom blowing powder injection control cut-off valves corresponding to the 1 st group of bottom blowing electrodes are opened, the rest bottom blowing powder injection control cut-off valves are closed, and the bottom blowing carrier gas-powder device conveys carrier gas-powder and is sprayed into a molten pool through the 1 st group of bottom blowing electrodes after being distributed through a bottom blowing powder distribution device;
S2, after an early warning device of a certain bottom blowing electrode in the 1 st group of bottom blowing electrodes recognizes that the bottom blowing electrode reaches an early warning position, a control system sends an instruction, a bottom blowing powder injection control cut-off valve corresponding to the 1 st group of bottom blowing electrodes is closed, a bottom blowing gas control cut-off valve is opened, the 1 st group of bottom blowing electrodes is switched from a bottom blowing powder injection mode to a pure gas injection mode, pure gas is injected into a molten pool, meanwhile, a bottom blowing powder injection control cut-off valve corresponding to the 2 nd group of bottom blowing electrodes is opened, the bottom blowing gas control cut-off valve is closed, the 2 nd group of bottom blowing electrodes is switched from the pure gas injection mode to the bottom blowing powder injection mode, carrier gas-powder is injected into a molten pool, and accordingly, the on-line switching of smelting tasks of the two groups of bottom blowing electrodes is realized;
s3, carrying out on-line switching of the smelting tasks of the next group of bottom blowing electrodes in sequence along with the smelting, and ending the furnace service.
7. The method for safe and long-service life of the direct-current arc bottom blowing electrode according to claim 6, wherein when the system for safe and long-service life of the direct-current arc bottom blowing electrode according to claim 2 is adopted, a certain bottom blowing electrode in service is eroded to a certain height position or worn to a certain radial position, namely reaches an early warning position, capillaries pre-buried in the position are ventilated, a bottom blowing gas control valve group detects gas flow information, the control system is combined with a pre-buried position database of the early capillaries, and the erosion height or the wearing position of the bottom blowing electrode is automatically detected, and when the bottom blowing electrode reaches the early warning position, replacement or furnace service offline treatment is required.
8. The method for safe and long-service life of the bottom blowing electrodes of the direct current arc furnace of claim 6, wherein all the bottom blowing electrodes in each group are used for blowing carrier gas-powder with different media into a molten pool.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310095684.7A CN116162761B (en) | 2023-02-08 | 2023-02-08 | System and method for safe and long-service life of direct-current arc furnace bottom blowing electrode |
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| CN202310095684.7A CN116162761B (en) | 2023-02-08 | 2023-02-08 | System and method for safe and long-service life of direct-current arc furnace bottom blowing electrode |
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| CN116162761B true CN116162761B (en) | 2025-08-15 |
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| CN112430699A (en) * | 2021-01-26 | 2021-03-02 | 北京科技大学 | Long-service-life service method for synergistic hot replacement of bottom powder spraying converter bottom and bottom blowing brick |
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| US4913732A (en) * | 1988-05-19 | 1990-04-03 | Nkk Corporation | Method for smelting reduction in electric furnace |
| CN201081561Y (en) * | 2007-08-01 | 2008-07-02 | 钢铁研究总院 | Bottom air blowing component of alarm type electric arc furnace |
| CN103468863B (en) * | 2013-09-29 | 2016-02-03 | 武汉嘉特重型设备有限公司 | The smelting technology of electric arc furnace top and bottom blowing system and this system of employing |
| CN207793318U (en) * | 2017-11-24 | 2018-08-31 | 北京科技大学 | A kind of multiduty bottom-blowing of converter element |
| CN111635977B (en) * | 2020-05-14 | 2021-03-23 | 北京科技大学 | A fully continuous ultra-short electric arc furnace steelmaking process production equipment and process |
| CN215713129U (en) * | 2021-07-30 | 2022-02-01 | 中冶赛迪工程技术股份有限公司 | Direct current electric arc furnace bottom electrode and bottom blowing cooperative steelmaking device |
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2023
- 2023-02-08 CN CN202310095684.7A patent/CN116162761B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430699A (en) * | 2021-01-26 | 2021-03-02 | 北京科技大学 | Long-service-life service method for synergistic hot replacement of bottom powder spraying converter bottom and bottom blowing brick |
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