CN112877507B - RH furnace dip pipe blowhole anti-blocking device and method for removing blowhole steel slag - Google Patents
RH furnace dip pipe blowhole anti-blocking device and method for removing blowhole steel slag Download PDFInfo
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- CN112877507B CN112877507B CN202110281417.XA CN202110281417A CN112877507B CN 112877507 B CN112877507 B CN 112877507B CN 202110281417 A CN202110281417 A CN 202110281417A CN 112877507 B CN112877507 B CN 112877507B
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention belongs to the field of ferrous metallurgy steelmaking, and particularly relates to an anti-blocking device for a gas blowing hole of an immersed tube of an RH furnace and a method for removing steel slag of the gas blowing hole. The cleaning process is safe and efficient, has shorter treatment time and lower cost than the process of additionally adding reactants, and can effectively remove the steel slag deeply blocked in the blowholes. The anti-blocking device can effectively reduce the condition that the flow of the air blowing hole is reduced or is completely blocked, thereby ensuring the circular flow effect of the dip pipe in the service life period and avoiding the dip pipe from being disconnected due to the blocking.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy steelmaking, and particularly relates to an anti-blocking device for a blowhole of an RH furnace dip pipe and a method for removing blowhole steel slag.
Background
The circulation flow of the RH furnace can most directly reflect the refining efficiency of RH. The circulation flow is increased, so that the RH processing capacity can be improved, the uniformity and purity of molten steel components are enhanced, and the molten steel quality is improved and stabilized. The size and flow of the blowing holes of the dipping pipe are the most direct dynamic influencing key factors of the circulation flow, so the blowing holes of the dipping pipe become an important part of the attention of the vacuum refining furnace technicians; the condition that a large amount of molten steel and steel slag flow in the rising pipe of the dipping pipe to block the air blowing holes in the circulating process of the vacuum furnace or the condition that the steel slag in the bath flows out to block the air blowing holes of the dipping pipe after being melted in the baking process of the vacuum bath occurs, so that great trouble is brought to the control of the production process.
Ai Xin harbor et al, in 2011, "special steel" No. 4, no. 27, the influence of the gas hole blockage on the uniform mixing of molten steel ", have shown that the circulation efficiency of an RH furnace can be obviously influenced after the gas hole blockage of a dip pipe exceeds 3. Chinese patent document CN105714024B provides a method for removing steel slag in the bottom of RH vacuum chamber, which uses the heat released during the reaction of aluminum oxide to melt and remove the steel slag. Preheating: controlling the oxygen lance position at 5000-5600 mm, the gas flow rate at 400-500 m/h, baking for 10-20 min, and raising the lifting gas flow rate to 120-150 m/h after the steel slag drops from the bottom tank. Adding aluminum: 100 kg to 200kg of aluminum wire segments are added into the bottom groove part of the vacuum chamber by using an aluminum alloy hopper. Slag melting: controlling the oxygen lance position at 5000-5600 mm, the gas flow rate at 400-600 m/h, continuously baking for 5-20 min until the aluminum wire section added into the bottom groove burns, and melting the steel slag; after the aluminum wire section is reacted, the flow of the lifting gas is adjusted to 80-120 m/h. The invention can realize on-line removal of bonded steel slag at the bottom of the bottom groove of the RH vacuum chamber, thereby effectively reducing slag hanging of the RH circulation pipe, expanding the inner diameter of the circulation pipe, improving the circulation speed of RH molten steel and ensuring the product quality.
The technical scheme mainly comprises the steps of removing cold steel in the vacuum tank, utilizing aluminum oxygen reaction to release heat and baking by an oxygen gun to heat and cool steel for removal, so that aluminum alloy is required to be additionally added for heating reaction, coal gas is introduced, the cost is high, the reaction time is long, hanging slag at the port of the circulation pipe can only be melted and removed, and the removal effect on the steel slag with deeper blockage inside the circulation pipe (namely a blowhole) is not achieved.
Disclosure of Invention
The invention aims to provide an anti-blocking device for a blowhole of an RH furnace dip pipe and a method for removing blowhole steel slag. When the air blowing hole of the rising pipe of the dipping pipe is reduced or completely blocked, oxygen is introduced when the vacuum tank is not treated, and oxygen is utilized to perform oxidation reaction with steel slag in the air blowing hole of the rising pipe of the dipping pipe, so that the blocked steel slag at the air blowing hole of the rising pipe of the dipping pipe is melted; and is blown out of the blowholes by oxygen with a certain flow rate. The cleaning process is safe and efficient, has shorter treatment time and lower cost than the process of additionally adding reactants, and can effectively remove the steel slag deeply blocked in the blowholes.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the anti-blocking device for the air blowing hole of the dip tube of the RH furnace comprises a dip tube ascending tube, wherein the lower end of the dip tube ascending tube is provided with the air blowing hole, the air blowing hole is connected with an air blowing pipeline, the far end side of the air blowing pipeline, which is away from the dip tube ascending tube, is connected with a nitrogen gas branch pipeline and an argon gas branch pipeline, and the near end side of the air blowing pipeline, which is away from the dip tube ascending tube, is sequentially provided with an oxygen gas branch pipeline and a flowmeter from left to right;
and flow control valves are respectively arranged on the nitrogen branch pipeline, the argon branch pipeline and the oxygen branch pipeline.
Because the aperture of the air blowing pipeline is constant, the air with the same initial pressure and initial flow is introduced, when the air blowing hole is blocked, the pressure in the air blowing pipeline is increased, the corresponding air flow rate is reduced, the flow value measured by the flowmeter is correspondingly reduced, and the blocking degree of the air blowing hole is judged; meanwhile, as the reaction is just finished, the dipping pipe is in a high-temperature state, oxygen is introduced at the moment, so that the oxygen reacts with the steel slag blocked at the air blowing hole, the steel slag is melted, the steel slag is blown off from the air blowing hole by oxygen with a certain flow rate, in actual operation, the cleaning effect can be judged by judging whether the steel slag falls from the dipping pipe, and when no steel slag falls, the actual cleaning effect of the steel slag at the air blowing hole and the corrosion condition of the steel slag on the dipping pipe are further confirmed by visual observation.
The technical scheme of the invention is as follows: the dip tube riser is provided with 12 air blowing holes, and is divided into 2 layers, and 6 air blowing holes of each layer are evenly distributed along the dip tube riser circumference, and the upper layer and the lower layer are staggered.
The technical scheme of the invention is as follows: still include nitrogen gas trunk line, argon gas trunk line, oxygen trunk line, pressure transmitter and air supply, nitrogen gas branch pipeline, argon gas branch pipeline, oxygen branch pipeline are connected with corresponding air supply through nitrogen gas trunk line, argon gas trunk line, oxygen trunk line respectively, be provided with pressure transmitter on nitrogen gas trunk line, argon gas trunk line, the oxygen trunk line respectively. The gas source comprises an oxygen gas source, a nitrogen gas source and an argon gas source.
The method for removing the steel slag of the gas blowing hole utilizes the heat release in the carbon-oxygen reaction process to partially or completely melt the steel slag, reduces the adhesive force between the steel slag and the inner wall of the gas blowing hole, and utilizes the oxygen with a certain flow rate to blow down the steel slag or the steel slag in the gas blowing hole, and the specific method and the steps are as follows:
(1) And (3) information acquisition: the pressure transmitter has constant pressure, the working temperature of the RH furnace is simulated, the influence of temperature change in actual operation on a test result is small, the influence is not considered, when a record gas hole is not blocked, the flow control valve is regulated to enable the initial flow of gas to be 50-150 m < 3 >/h, and the flow value of the position of the flowmeter under the condition of different initial flow of gas is recorded; the pressure value range of the pressure transmitter on the argon main pipeline and the nitrogen main pipeline is controlled to be 0.9-1.5 mpa, and the pressure value range of the pressure transmitter on the oxygen main pipeline is controlled to be 1.0-1.2 mpa;
(2) Jam determination: the gas with the same pressure and flow rate is introduced at the same temperature, and when the flow rate value measured by the flow meter is reduced by 10% compared with the information acquisition corresponding value when the gas blowing hole is not blocked, the gas blowing hole is indicated to be blocked; where pressure is controlled by a pressure transmitter and flow is controlled by a flow control valve;
(3) Blowing oxygen slag: after smelting is completed, oxygen is introduced into the blocked air blowing hole, and the flow control valve is regulated to enable the initial flow of the oxygen corresponding to the oxygen branch pipeline to be 80-100 m < 3 >/h until the flow value actually measured by the corresponding flowmeter is the same as the information acquisition corresponding value when the air blowing hole is not blocked, so that slag removal is completed.
The method for removing the gas-hole steel slag further comprises the following steps:
(4) Intelligent oxygen blowing: for blocking of different degrees of the air blowing hole, the oxygen initial flow is intelligently controlled, when the flow value measured by the flow meter is reduced by 10% -50% compared with the information acquisition corresponding value when the air blowing hole is not blocked, the flow control valve is adjusted to enable the oxygen partial pipeline to correspond to the oxygen initial flow to be 80-90m < 3 >/h, when the flow value measured by the flow meter is reduced by more than 50% compared with the information acquisition corresponding value when the air blowing hole is not blocked, the oxygen partial pipeline is adjusted to enable the oxygen partial pipeline to correspond to the oxygen initial flow to be 90-100m < 3 >/h, and the deslagging is completed until the flow value actually measured by the corresponding flow meter is identical to the information acquisition corresponding value when the air blowing hole is not blocked.
Because all the oxygen sub-pipelines are connected with the oxygen main pipeline at the same time, the pressure transmitter controls the initial pressure of the oxygen main pipeline, one or more of the oxygen sub-pipelines is closed, the initial pressure of other oxygen sub-pipelines is correspondingly large, and the initial flow of oxygen can be improved; the opening degree of the flow control valve of the oxygen branch pipeline is controlled, the initial oxygen pressure and the flow value of the oxygen branch pipeline can be controlled, oxygen with the same initial pressure and initial flow rate is introduced, the pressure difference between the flowmeter and the air blowing hole on the corresponding air blowing pipeline is constant, when the air blowing hole is blocked, the pressure difference between the flowmeter and the air blowing hole is reduced, the oxygen flow rate is slowed down, the flow value measured at the flowmeter is reduced, and therefore the blocked degree of the air blowing hole and the oxygen cleaning progress can be judged according to the change of the flow value measured by the flowmeter. Meanwhile, the flow of the initial oxygen is adjusted according to the blocking degree of the air blowing holes, so that the steel slag cleaning speed can be increased, and the waste of oxygen is avoided.
The invention has the beneficial effects that:
(1) The invention is applied to cleaning the blockage of the blowhole of the rising pipe of the dipping pipe in a high-temperature environment, thereby avoiding the occurrence of the falling line of the dipping pipe caused by blockage, prolonging the service life of the dipping pipe and ensuring the stability of the circulation efficiency and the stability of the molten steel quality in the service life of the dipping pipe;
(2) The invention adopts the prior equipment to carry out simple transformation, has stronger operation implementation, realizes remote operation of cleaning the blockage of the air blowing hole, does not need personnel to confirm the cleaning effect in a short distance, avoids the direct contact between personnel and high-temperature steel slag, can adjust the initial gas flow of corresponding oxygen gas branch pipelines aiming at the blockage of the air blowing hole with different degrees, improves the deslagging efficiency and effect, and simultaneously adjusts the oxygen consumption according to the blockage degree of the air blowing hole to achieve the aim of saving cost;
(3) The oxygen and the steel slag are directly subjected to oxidation chemical reaction to clean the blocked blowholes, so that the method is more efficient than adding reactants, the treatment time is short, the cost is lower, and the method can be used for effectively removing the steel slag deeply blocked in the blowholes.
Drawings
FIG. 1 is a schematic structural view of an anti-blocking device for a blowhole of an RH furnace dip pipe;
FIG. 2 is a schematic diagram of the arrangement mode of the blowholes of the anti-blocking device for the blowholes of the dip pipe of the RH furnace;
in the figure: 1 vacuum tank, 2 dip tube ascending pipe, 3 dip tube descending pipe, 4 blowholes, 5 nitrogen branch pipes, 6 argon branch pipes, 7 blowpipes, 8 oxygen branch pipes and 9 flowmeter.
Detailed Description
The invention is further described below with reference to the drawings and specific examples of embodiments, but the invention is not therefore limited to the scope of the description of the embodiments.
Example 1
As shown in fig. 1, an anti-blocking device for a blowhole of an dip tube of an RH furnace comprises a vacuum tank 1, a dip tube ascending tube 2, a dip tube descending tube 3, a blowhole 4, a nitrogen gas branch tube 5, an argon gas branch tube 6 and a blowhole 7, wherein the dip tube ascending tube 2 and the dip tube descending tube 3 are arranged at the bottom of the vacuum tank 1, the blowhole 4 is arranged at the lower end of the dip tube ascending tube 2, the blowhole 4 is connected with a blowhole 7, a nitrogen gas branch tube 5 and an argon gas branch tube 6 are connected at the far end side of the blowhole 7 away from the dip tube ascending tube 2, and an oxygen gas branch tube 8 and a flowmeter 9 are sequentially arranged at the near end side of the blowhole 7 away from the dip tube ascending tube 2 from left to right.
Flow control valves are respectively arranged on the nitrogen sub-pipeline 5, the argon sub-pipeline 6 and the oxygen sub-pipeline 8.
As shown in fig. 2, the dip tube riser tube 2 is provided with 12 air blowing holes 4, which are divided into 2 layers, and 6 air blowing holes 4 on each layer are uniformly distributed along the circumference of the dip tube riser tube 2, and the upper layer and the lower layer are staggered.
The RH furnace dip pipe blowhole anti-blocking device is further provided with a nitrogen main pipe, an argon main pipe, an oxygen main pipe and an air source, the nitrogen sub-pipe 5, the argon sub-pipe 6 and the oxygen sub-pipe 8 are respectively connected with the corresponding air source through the nitrogen main pipe, the argon main pipe and the oxygen main pipe, and pressure transmitters are respectively arranged on the nitrogen main pipe, the argon main pipe and the oxygen main pipe.
Example 2:
the method for removing the steel slag of the blowholes is implemented by using the anti-blocking device for the blowholes of the dip pipe of the RH furnace in the embodiment 1, after the smelting of the RH furnace is completed, the vacuum tank 1 is repressed, an operator descends the ladle, and the blowholes 4 of the dip pipe ascending pipe 2 are automatically converted from argon into nitrogen for protection.
1) The pressure of the pressure transmitter corresponding to the main nitrogen pipeline is 1mpa, the initial flow of the nitrogen branch pipeline 5 is 85m3/h, when 1 blockage of the air blowing hole 4 occurs, the flow value measured by the flowmeter 9 is reduced by 20% compared with the information acquisition corresponding value when the air blowing hole 4 is not blocked, the pressure value of the pressure transmitter of the main oxygen pipeline is 1.0mpa, the corresponding flow control valve of the oxygen branch pipeline 8 is controlled to be opened, and the flow control valve of the nitrogen branch pipeline 5 is closed after 30 seconds.
2) The initial flow of oxygen in the oxygen sub-pipeline 8 is 85m3/h, the cleaning time is 1.5min, when the flow value measured by the flowmeter 9 rises to the information acquisition corresponding value when the air blowing hole 4 is not blocked, the flow control valve of the nitrogen sub-pipeline 5 is opened, and meanwhile, the flow control valve of the oxygen sub-pipeline 8 is closed after 30 seconds.
Example 3:
when a plurality of blowholes 4 are clogged, unlike in example 2, it is necessary to consider a change in the initial flow rate of the oxygen required because the respective clogging degrees are different.
1) The pressure of the pressure transmitter corresponding to the main nitrogen pipeline is 1mpa, the initial flow of the nitrogen branch pipeline 5 is 85m3/h, when 2 air blowing holes 4 are blocked, the flow value measured by one flowmeter 9 is reduced by 25% compared with the corresponding value of unblocked information acquisition, the flow value measured by the other flowmeter 9 is reduced by 80% compared with the corresponding value of unblocked information acquisition of the air blowing holes 4, the pressure value of the pressure transmitter of the main oxygen pipeline is 1.0mpa, the flow control valves of the oxygen branch pipelines 8 corresponding to the pressure transmitter are controlled to be opened, and the flow control valve of the nitrogen branch pipeline 5 is closed after 30 seconds.
2) The initial flow of oxygen of the oxygen sub-pipeline 8 corresponding to the air hole 4 with the blockage of 25% is 85m3/h, the initial flow of oxygen of the oxygen sub-pipeline 8 corresponding to the air hole 4 with the blockage of 80% is 95m3/h, the oxygen cleaning time is 2min, when the flow value measured by the flowmeter 9 rises to the information acquisition corresponding value when the air hole 4 is not blocked, the flow control valve of the nitrogen sub-pipeline 5 is opened, and meanwhile, the flow control valve of the oxygen sub-pipeline 8 is closed after 30 seconds. Through the adjustment to the initial flow of oxygen, effectual blowing hole 4 to different jam degree carries out the clearance that pertinence, has avoided the waste of oxygen simultaneously.
In summary, the invention is adopted to clean the air blowing hole 4 of the dip pipe rising pipe 2 blocked, can efficiently and accurately remove the blocking materials such as steel slag in the air blowing hole 4, directly utilizes oxygen to directly generate oxidation reaction with the steel slag, can control the cleaning time within 3min, does not need other reactants, can effectively remove the steel slag with deeper blocking in the air blowing hole 4, provides powerful guarantee for molten steel smelting, has a larger effect for long-term stability of molten steel quality, and improves the service life of the dip pipe and the production efficiency of molten steel.
The site operation usability is strong, the safety is higher, meanwhile, the blocking degree and the cleaning progress of the air blowing hole 4 are prejudged by utilizing the measured value change of the flowmeter 9, the waste of oxygen is avoided, and the deslagging efficiency is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the 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 appended claims.
Claims (4)
1. A method for removing gas hole steel slag, which is characterized in that: utilize RH furnace dip pipe gas vent anti-clogging device, RH furnace dip pipe gas vent anti-clogging device includes dip pipe tedge (2), dip pipe tedge (2) lower extreme is provided with gas vent (4), gas vent (4) are connected with a blowing pipeline (7), are connected with a nitrogen gas branch pipeline (5) and an argon gas branch pipeline (6) at the distal end side that blowing pipeline (7) was gone up from dip pipe tedge (2), are equipped with an oxygen gas branch pipeline (8) and a flowmeter (9) from left to right in proper order at the proximal end side that blowing pipeline (7) was gone up from dip pipe tedge (2);
flow control valves are respectively arranged on the nitrogen sub-pipeline (5), the argon sub-pipeline (6) and the oxygen sub-pipeline (8);
the heat release in the carbon-oxygen reaction process is utilized to partially or completely melt the steel slag, the adhesive force between the steel slag and the inner wall of the gas blowing hole (4) is reduced, and the molten steel or the steel slag in the gas blowing hole (4) is blown off by utilizing oxygen with a certain flow rate, and the specific method and the steps are as follows:
(1) And (3) information acquisition: the pressure transmitter has constant pressure and simulates the working temperature of the RH furnace, the influence of temperature change in actual operation on a test result is small, the influence is not considered, and when the record blowhole (4) is not blocked, the flow control valve is regulated to ensure that the initial flow of gas is 50-150 m 3 Recording the flow value of the position of the flowmeter (9) under different initial flow gas conditions;
(2) Jam determination: the gas with the same pressure and flow rate is introduced at the same temperature, and when the flow rate value measured by the flowmeter (9) is reduced by 10% compared with the information acquisition corresponding value when the gas blowing hole (4) is not blocked, the gas blowing hole (4) is indicated to be blocked;
(3) Blowing oxygen slag: after smelting, oxygen is introduced into the blocked blowholes (4), and the flow control valve is regulated to ensure that the initial flow of the oxygen corresponding to the oxygen sub-pipeline (8) is 80-100 m 3 And/h, indicating that deslagging is completed until the flow value actually measured by the corresponding flowmeter (9) is the same as the information acquisition corresponding value when the blowhole (4) is not blocked.
2. The method for removing gas-hole steel slag according to claim 1, wherein: the method also comprises the following steps:
(4) Intelligent oxygen blowing: for blocking of the air blowing hole (4) in different degrees, the initial flow of oxygen is intelligently controlled, and when the flow value measured by the flowmeter (9) is reduced by 10-50% compared with the information acquisition corresponding value when the air blowing hole (4) is not blocked, the flow control valve is regulated to enable the initial flow of oxygen corresponding to the oxygen sub-pipeline (8) to be 80-90m 3 And/h, when the flow value measured by the flowmeter (9) is reduced by more than 50% compared with the information acquisition corresponding value when the air blowing hole (4) is not blocked, adjusting the flow control valve to enable the initial flow of oxygen corresponding to the oxygen sub-pipeline (8) to be 90-100m 3 And/h, completing deslagging until the flow value actually measured by the corresponding flowmeter (9) is the same as the information acquisition corresponding value when the blowhole (4) is not blocked.
3. The method for removing gas-hole steel slag according to claim 1, wherein: the dipping pipe ascending pipe (2) is provided with 12 air blowing holes (4), and is divided into 2 layers, 6 air blowing holes (4) of each layer are evenly distributed along the circumference of the dipping pipe ascending pipe (2), and the upper layer and the lower layer are staggered.
4. The method for removing gas-hole steel slag according to claim 1, wherein: still include nitrogen gas trunk line, argon gas trunk line, oxygen trunk line, pressure transmitter and air supply, nitrogen gas branch pipeline (5), argon gas branch pipeline (6), oxygen branch pipeline (8) are connected with corresponding air supply through nitrogen gas trunk line, argon gas trunk line, oxygen trunk line respectively, be provided with pressure transmitter on nitrogen gas trunk line, the argon gas trunk line, the oxygen trunk line respectively.
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| CN114703340B (en) * | 2022-03-14 | 2023-03-14 | 广东韶钢松山股份有限公司 | Method for reducing RH furnace and hot bent pipe junction cooling steel slag |
| CN114959186A (en) * | 2022-06-10 | 2022-08-30 | 东北大学 | RH vacuum refining device and method with partition wall in ladle |
| CN117782471B (en) * | 2024-02-27 | 2024-06-14 | 中国重型机械研究院股份公司 | Device and method for detecting conduction capacity of argon blowing pipeline of RH vacuum tank dip pipe |
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| CN108315529A (en) * | 2018-04-21 | 2018-07-24 | 江西理工大学 | A kind of RH refining furnaces tedge gas hole arrangement |
| CN215251001U (en) * | 2021-02-03 | 2021-12-21 | 山东钢铁股份有限公司 | Anti-blocking device for blowing hole of dip pipe of RH furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102226226A (en) * | 2011-06-20 | 2011-10-26 | 鞍山华威冶金用氧设备有限公司 | Method for preventing mushroom head blockage in converter steel making process |
| CN207537484U (en) * | 2017-11-17 | 2018-06-26 | 新冶高科技集团有限公司 | A kind of raising air brick of steel ladle service life blows block apparatus |
| CN108315529A (en) * | 2018-04-21 | 2018-07-24 | 江西理工大学 | A kind of RH refining furnaces tedge gas hole arrangement |
| CN215251001U (en) * | 2021-02-03 | 2021-12-21 | 山东钢铁股份有限公司 | Anti-blocking device for blowing hole of dip pipe of RH furnace |
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