CN112877507A - Anti-blocking device for blowing hole of RH furnace dipping pipe and method for removing steel slag in blowing hole - Google Patents
Anti-blocking device for blowing hole of RH furnace dipping pipe and method for removing steel slag in blowing hole Download PDFInfo
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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
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Abstract
The invention belongs to the field of steel metallurgy steelmaking, and particularly relates to an anti-blocking device for a blowing hole of a dip pipe of an RH furnace and a method for removing steel slag in the blowing hole. The cleaning process is safe and efficient, is more efficient than adding a reactant, has short treatment time and lower cost, and can effectively remove the steel slag deeply blocked in the blowing holes. The anti-blocking device can effectively reduce the situation that the flow of the air blowing hole is reduced or completely blocked, thereby ensuring the circulation effect in the service life of the dip pipe and avoiding the occurrence of off-line of the dip pipe due to blocking.
Description
Technical Field
The invention belongs to the field of steel making in ferrous metallurgy, and particularly relates to an anti-blocking device for a blowing hole of a dip pipe of an RH furnace and a method for removing steel slag in the blowing hole.
Background
The RH furnace circulation flow rate can most directly reflect the RH refining efficiency. The circulation flow is increased, the RH processing capacity can be improved, and the uniformity and the purity of the components of the molten steel are enhanced, so that the quality of the molten steel is improved and stabilized. The size and the flow of the air blowing hole of the dip pipe are the most direct dynamic influence key factors of the circulation flow, so the air blowing hole of the dip pipe becomes an important part concerned by technical personnel of the vacuum refining furnace; the blowing holes are blocked due to the fact that a large amount of molten steel and steel slag flow in an ascending pipe of the dip pipe in the circulation process of the vacuum furnace, or the situation that the steel slag in the baking process of the vacuum tank flows out after being melted to block the blowing holes of the dip pipe occurs sometimes, and great troubles are brought to the management and control of the production process.
The study of the 'RH process and the influence of the blowing hole blockage on the uniform mixing of molten steel' in 2011, No. 27 of Special Steel, No. 4 of Aixingang et al shows that when the number of the blowing holes of the dip pipe exceeds 3, the circulation efficiency of the RH furnace is obviously influenced. Chinese patent document CN105714024B provides a method for removing steel slag in a bottom groove of an RH vacuum chamber, which utilizes heat release during an aluminum oxidation reaction to melt and remove the steel slag. Preheating: controlling the lance position of the oxygen lance to be 5000-5600 mm, controlling the gas flow to be 400-500 m/h, baking for 10-20 min, and increasing the lifting gas flow to 120-150 m/h after steel slag begins to drip from the bottom groove. Adding aluminum: and adding 100-200 kg of aluminum wire sections to the groove part at the bottom of the vacuum chamber by using an aluminum alloy hopper. Slagging: controlling the position of an oxygen lance to be 5000-5600 mm and the gas flow to be 400-600 m/h, continuously baking for 5-20 min until an aluminum wire section added into a bottom groove burns, and melting steel slag; after the reaction of the aluminum wire section is finished, the flow of the lifting gas is adjusted to 80-120 m/h. The invention can realize on-line removal of the bonded steel slag at the bottom of the bottom groove of the RH vacuum chamber, thereby effectively reducing slag adhering of the RH circulation tube, enlarging the inner diameter of the RH circulation tube, improving the circulation speed of the RH molten steel and ensuring the product quality reliably.
According to the technical scheme, cold steel in the vacuum tank is removed, the cold steel is removed by utilizing the aluminum oxygen reaction heat release and the oxygen gun baking heating cold steel removal, so that an aluminum alloy is additionally added for heating reaction, coal gas is introduced, the cost is high, the reaction time is long, only hanging slag at the port of the circulating pipe can be melted and removed, and the effect of removing steel slag deeply blocked in the circulating pipe (namely a blowing hole) is not achieved.
Disclosure of Invention
The invention aims to provide an anti-blocking device for a blowing hole of a dip pipe of an RH furnace and a method for removing steel slag in the blowing hole. When the air blowing holes of the ascending pipes of the dipping pipe are reduced or completely blocked, introducing oxygen when the vacuum tank is not processed, and carrying out oxidation reaction on the oxygen and steel slag in the air blowing holes of the ascending pipes of the dipping pipe so as to melt the blocked steel slag at the air blowing holes of the ascending pipes of the dipping pipe; and is blown out of the air blowing holes by oxygen with a certain flow rate. The cleaning process is safe and efficient, is more efficient than adding a reactant, has short treatment time and lower cost, and can effectively remove the steel slag deeply blocked in the blowing holes.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-blocking device for a blowing hole of a dip pipe of an RH furnace comprises a dip pipe riser, wherein the lower end of the dip pipe riser is provided with the blowing hole, the blowing hole is connected with a blowing pipeline, the far end side of the blowing pipeline, away from the dip pipe riser, is connected with a nitrogen branch pipeline and an argon branch pipeline, and the near end side of the blowing pipeline, away from the dip pipe riser, is sequentially provided with an oxygen branch pipeline and a flowmeter from left to right;
and the nitrogen branch pipeline, the argon branch pipeline and the oxygen branch pipeline are respectively provided with a flow control valve.
Because the aperture of the air blowing pipeline is constant, 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, and the flow value measured by the flow meter is correspondingly reduced, so that the blocking degree of the air blowing hole is judged; simultaneously because the reaction is just finished, the dip pipe is in high temperature state, at this moment, let in oxygen, can make oxygen and the slag that gas blowing hole department blockked up react, thereby make the slag melt, thereby blown down from the gas blowing hole by certain velocity of flow oxygen, in the actual operation, also can judge the clearance effect with the help of whether there is slag to fall down from the dip pipe, when no slag falls down, artifical through the actual clearance effect of visual observation gas blowing hole department slag and to the further affirmation of the erosion condition of dip pipe resistant material.
The technical scheme of the invention is as follows: the dip pipe riser is provided with 12 air blowing holes which are divided into 2 layers, 6 air blowing holes in each layer are uniformly distributed along the circumference of the dip pipe riser, and the upper layer and the lower layer are arranged in a staggered mode.
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 the 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.
A method for removing steel slag in a blowing hole utilizes heat release in a 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 blowing hole, and blows off the steel slag or the steel slag in the blowing hole by utilizing oxygen with a certain flow velocity, and the specific method and the steps are as follows:
(1) and information acquisition: the pressure of a pressure transmitter is constant, the working temperature of the RH furnace is simulated, the influence of temperature change on a test result in actual operation is small, no consideration is given to the temperature change, when the gas blowing hole is not blocked, the flow control valve is adjusted to enable the initial flow of gas to be 50-150 m3/h, and the flow value of the position of the flow meter under the condition of different initial flow of gas is recorded; the pressure value ranges of the pressure transmitters on the argon main pipeline and the nitrogen main pipeline are controlled to be 0.9-1.5 mpa, and the pressure value ranges of the pressure transmitters on the oxygen main pipeline are controlled to be 1.0-1.2 mpa;
(2) and judging blockage: introducing gas with the same pressure and flow rate at the same temperature, and when the flow rate value measured by the flowmeter is reduced by 10% compared with the corresponding value of information acquisition when the gas blowing hole is not blocked, indicating that the gas blowing hole is blocked; the pressure is controlled by a pressure transmitter, and the flow is controlled by a flow control valve;
(3) blowing oxidation slag: and after smelting is finished, introducing oxygen into the blocked air blowing holes, and adjusting the flow control valves to enable the initial flow of the oxygen corresponding to the oxygen branch pipelines to be 80-100 m3/h until the actually measured flow value of the corresponding flow meter is the same as the information acquisition corresponding value when the air blowing holes are not blocked, so that deslagging is finished.
The method for removing the steel slag with the blowing holes further comprises the following steps:
(4) and intelligently blowing oxygen: aiming at the blockage of the air blowing hole in different degrees, the initial flow of oxygen is intelligently controlled, when the flow value measured by the flowmeter is reduced by 10-50% compared with the corresponding value of information acquisition when the air blowing hole is not blocked, the flow control valve is adjusted to enable the initial flow of oxygen corresponding to the oxygen branch pipeline to be 80-90m3/h, when the flow value measured by the flowmeter is reduced by more than 50% compared with the corresponding value of information acquisition when the air blowing hole is not blocked, the flow control valve is adjusted to enable the initial flow of oxygen corresponding to the oxygen branch pipeline to be 90-100m3/h, and the deslagging is completed until the actually measured flow value of the corresponding flowmeter is the same as the corresponding value of information acquisition when the air.
Because all the oxygen branch pipelines are simultaneously connected with the oxygen main pipeline, the pressure transmitter controls the initial pressure of the oxygen main pipeline, one or more oxygen branch pipelines are closed, the initial pressure of other oxygen branch pipelines is correspondingly increased, and the initial flow of oxygen can be increased; and through controlling the opening degree of the flow control valve of the oxygen branch pipeline, the initial oxygen pressure and flow value of the oxygen branch pipeline can be controlled, oxygen with the same initial pressure and initial flow is introduced, the pressure difference corresponding to the flow meter on the air blowing pipeline and the air blowing hole is constant, when the air blowing hole is blocked, the pressure difference between the flow meter and the air blowing hole is reduced, the flow velocity of the oxygen is reduced, and the flow value measured at the flow meter is reduced, so that the blocking 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 flow meter. Meanwhile, the flow of the initial oxygen is adjusted according to the degree of blockage of the air blowing hole, the steel slag cleaning speed can be increased, and the waste of the oxygen is avoided.
The invention has the beneficial effects that:
(1) the cleaning device is applied to cleaning the blockage of the blowing hole of the ascending pipe of the dip pipe in a high-temperature environment, avoids the occurrence of off-line of the dip pipe due to blockage, prolongs the service life of the dip pipe, and ensures the stability of the circulation efficiency and the stability of the molten steel quality in the service life of the dip pipe;
(2) the invention is simply reformed based on the existing equipment, the operation implementation is stronger, the cleaning of the blockage of the air blowing hole realizes remote operation, personnel does not need to confirm the cleaning effect in a short distance, the direct contact between the personnel and the high-temperature steel slag is avoided, the initial gas flow of the corresponding oxygen branch pipeline can be adjusted aiming at the blockage of the air blowing hole in different degrees, the deslagging efficiency and the effect are improved, and the purpose of saving the cost is achieved by adjusting the oxygen consumption according to the blockage degree of the air blowing hole;
(3) the method has the advantages that the blocked blowing holes are cleaned by directly performing oxidation chemical reaction on the oxygen and the steel slag, the efficiency is higher than that of additionally adding a reactant, the treatment time is short, the cost is lower, and particularly, the steel slag deeply blocked in the blowing holes can be effectively removed.
Drawings
FIG. 1 is a schematic structural view of an anti-blocking device for a blowing hole of a dip pipe of an RH furnace according to the present invention;
FIG. 2 is a schematic diagram of the arrangement of blowing holes of the anti-blocking device for the blowing holes of the dip pipe of the RH furnace;
in the figure: the device comprises a vacuum tank 1, a dip pipe riser 2, a dip pipe downcomer 3, a blowing hole 4, a nitrogen gas branched pipeline 5, an argon gas branched pipeline 6, a blowing pipeline 7, an oxygen gas branched pipeline 8 and a flow meter 9.
Detailed Description
The invention is further illustrated in the following description of embodiments with reference to the figures, without thereby limiting the invention to the described embodiments.
Example 1
As shown in fig. 1, an anti-clogging device for a blowing hole of a dip pipe of an RH furnace comprises a vacuum tank 1, a dip pipe rising pipe 2, a dip pipe descending pipe 3, a blowing hole 4, a nitrogen branch pipe 5, an argon branch pipe 6 and a blowing pipe 7, wherein the dip pipe rising pipe 2 and the dip pipe descending pipe 3 are arranged at the bottom of the vacuum tank 1, the blowing hole 4 is arranged at the lower end of the dip pipe rising pipe 2, the blowing hole 4 is connected with the blowing pipe 7, the far end side of the blowing pipe 7 away from the dip pipe rising pipe 2 is connected with the nitrogen branch pipe 5 and the argon branch pipe 6, the device further comprises an oxygen branch pipe 8 and a flow meter 9, and the near end side of the blowing pipe 7 away from the dip pipe rising pipe 2 is sequentially provided with the oxygen branch pipe 8 and the flow meter 9 from left to right.
And the nitrogen branch pipe 5, the argon branch pipe 6 and the oxygen branch pipe 8 are respectively provided with a flow control valve.
As shown in fig. 2, the dip pipe riser 2 is provided with 12 air blowing holes 4, which are divided into 2 layers, 6 air blowing holes 4 in each layer are uniformly distributed along the circumference of the dip pipe riser 2, and the upper layer and the lower layer are staggered.
RH stove dip pipe gas hole anti-clogging device still is provided with nitrogen gas trunk line, argon gas trunk line, oxygen trunk line and air supply, nitrogen gas branch pipeline 5, argon gas branch pipeline 6, oxygen branch pipeline 8 are connected with corresponding the 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.
Example 2:
the method for removing the steel slag in the blowing hole is implemented by using the anti-blocking device for the blowing hole of the dip pipe of the RH furnace in the embodiment 1, after smelting of the RH furnace is completed, the vacuum tank 1 is repressurized, an operator lowers a steel ladle, and the blowing hole 4 of the dip pipe riser 2 is interlocked and automatically converted from argon to nitrogen for protection.
1) The pressure of the main nitrogen pipeline corresponding to the pressure transmitter is 1mpa, the initial flow of the branch nitrogen pipeline 5 is 85m3/h, when 1 blockage occurs to the air blowing hole 4, 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 branch oxygen pipeline 8 is controlled to be opened, and the flow control valve of the branch nitrogen pipeline 5 is closed after 30 seconds.
2) The initial oxygen flow of the oxygen branch pipe 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 blowing hole 4 is not blocked, the flow control valve of the nitrogen branch pipe 5 is opened, and the flow control valve of the oxygen branch pipe 8 is closed after 30 seconds.
Example 3:
when clogging of a plurality of blow holes 4 occurs, unlike in example 2, it is necessary to take into account the variation in the initial flow rate of oxygen required, because the respective clogging degrees are different.
1) The pressure of the main nitrogen pipeline corresponding to the pressure transmitter is 1mpa, the initial flow of the branch nitrogen 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 non-blocked information acquisition corresponding value, the flow value measured by the other flowmeter 9 is reduced by 80% compared with the non-blocked information acquisition corresponding value 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 corresponding oxygen branch pipelines 8 are controlled to be opened, and the flow control valves of the branch nitrogen pipelines 5 are closed after 30 seconds.
2) The initial oxygen flow of the oxygen branch pipe 8 corresponding to the 25% blocked air blowing holes 4 is 85m3/h, the initial oxygen flow of the oxygen branch pipe 8 corresponding to the 80% blocked air blowing holes 4 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 blowing holes 4 are not blocked, the flow control valve of the nitrogen branch pipe 5 is opened, and meanwhile, the flow control valve of the oxygen branch pipe 8 is closed after 30 seconds. Through the adjustment to the initial flow of oxygen, effectual blowing hole 4 to different jam degrees carries out corresponding clearance, has avoided the waste of oxygen simultaneously.
In conclusion, the cleaning method for the blowing holes 4 blocked by the ascending pipes 2 of the dip pipe can efficiently and accurately remove steel slag and other blockages in the blowing holes 4, directly utilizes oxygen to directly generate oxidation reaction with the steel slag, can control the cleaning time within 3min without other reactants, can effectively clean the steel slag deeply blocked in the blowing holes 4, provides powerful guarantee for smelting molten steel, plays a great role in long-term stability of molten steel quality, and improves the service life of the dip pipe and the production efficiency of the molten steel.
And field operation usability is strong, the security is higher, utilizes the measured value of flowmeter 9 to change and foresees gas hole 4 jam degree and clearance progress simultaneously, has avoided the waste of oxygen to the efficiency of slagging-off has been improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a RH stove dip pipe blowing hole anti-clogging device, includes dip pipe tedge (2), dip pipe tedge (2) lower extreme is provided with blowing hole (4), blowing hole (4) are connected with one and blow pipeline (7), are connected with one nitrogen gas branch pipe way (5) and one argon gas branch pipe way (6) at the distal end side that blows pipeline (7) and leave dip pipe tedge (2), its characterized in that: an oxygen branch pipe (8) and a flowmeter (9) are sequentially arranged on the near end side of the air blowing pipe (7) from the left to the right from the ascending pipe (2) of the dip pipe;
and the nitrogen branch pipeline (5), the argon branch pipeline (6) and the oxygen branch pipeline (8) are respectively provided with a flow control valve.
2. The RH furnace dip pipe gas blow hole anti-clogging device of claim 1, wherein: the dip pipe ascending pipe (2) is provided with 12 air blowing holes (4) which are divided into 2 layers, 6 air blowing holes (4) in each layer are uniformly distributed along the circumference of the dip pipe ascending pipe (2), and the upper layer and the lower layer are arranged in a staggered mode.
3. The RH furnace dip pipe blow hole anti-clogging device according to claim 1 or 2, characterized in that: 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 the 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.
4. A method for removing steel slag with a blowing hole is characterized by comprising the following steps: the method comprises the following steps of partially or completely melting steel slag by utilizing heat release in a carbon-oxygen reaction process, reducing the adhesive force between the steel slag and the inner wall of a gas blowing hole (4), and blowing off the steel slag or the steel slag in the gas blowing hole (4) by utilizing oxygen with a certain flow velocity, wherein the specific method comprises the following steps:
(1) and information acquisition: the pressure of the pressure transmitter is constant, the working temperature of the RH furnace is simulated, the influence of temperature change on a test result in actual operation is small, no consideration is given to the temperature change, when the gas blowing hole (4) is not blocked, the flow control valve is adjusted to enable the initial flow of gas to be 50-150 m3/h, and the flow value of the position of the flowmeter (9) under different initial flow gas conditions is recorded;
(2) and judging blockage: introducing gas with the same pressure and flow rate 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 air blowing hole (4) is not blocked, indicating that the air blowing hole (4) is blocked;
(3) blowing oxidation slag: and after smelting is finished, introducing oxygen into the blocked air blowing holes (4), adjusting the flow control valve to enable the initial flow of the oxygen corresponding to the oxygen branch pipeline (8) to be 80-100 m3/h, and indicating that deslagging is finished until the actually measured flow value of the corresponding flowmeter (9) is the same as the information acquisition corresponding value when the air blowing holes (4) are not blocked.
5. The method for removing steel slag with a blowing hole according to claim 4, which is characterized by comprising the following steps of: further comprising the steps of:
(4) and intelligently blowing oxygen: aiming at the blockage of the air blowing hole (4) in different degrees, the initial flow of oxygen is intelligently controlled, when the flow value measured by the flow meter (9) is reduced by 10-50% compared with the corresponding value of information acquisition when the air blowing hole (4) is not blocked, the flow control valve is adjusted to enable the initial flow of oxygen corresponding to the oxygen branch pipeline (8) to be 80-90m3/h, when the flow value measured by the flow meter (9) is reduced by more than 50% compared with the corresponding value of information acquisition when the air blowing hole (4) is not blocked, the flow control valve is adjusted to enable the initial flow of oxygen corresponding to the oxygen branch pipeline (8) to be 90-100m3/h, and the deslagging is completed until the actually measured flow value of the corresponding flow meter (9) is the same as the corresponding value of information acquisition when the.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703340A (en) * | 2022-03-14 | 2022-07-05 | 广东韶钢松山股份有限公司 | Method for reducing RH furnace and hot bent pipe junction cold 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 |
| CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 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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| 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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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114703340A (en) * | 2022-03-14 | 2022-07-05 | 广东韶钢松山股份有限公司 | Method for reducing RH furnace and hot bent pipe junction cold 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 |
| CN117782471A (en) * | 2024-02-27 | 2024-03-29 | 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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| CN112877507B (en) | 2023-10-13 |
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