CN115232922A - RH refining furnace and method for shortening RH treatment period - Google Patents
RH refining furnace and method for shortening RH treatment period Download PDFInfo
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- CN115232922A CN115232922A CN202210820851.5A CN202210820851A CN115232922A CN 115232922 A CN115232922 A CN 115232922A CN 202210820851 A CN202210820851 A CN 202210820851A CN 115232922 A CN115232922 A CN 115232922A
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Abstract
The application provides an RH refining furnace and a method for shortening RH processing period, wherein the RH refining furnace comprises: the steel ladle (1) is used for containing molten steel, and a bottom blowing port (11) is formed in the bottom of the steel ladle (1); the vacuum chamber (2) is positioned above the ladle (1) and is provided with an ascending pipe (21), a descending pipe (22) and a vacuum chamber (23), and the pipe wall of the ascending pipe (21) is provided with a side blowing port (211); a first insufflation device (3) in fluid communication with the side insufflation port (211); a second insufflation means (4) in fluid communication with the bottom insufflation port (11). When the device is used for RH treatment, the driving gas is blown into the vacuum chamber through the second blowing device of the steel ladle and has a synergistic effect with the side-blown driving gas, so that the RH saturated circulation flow is effectively improved, the blending time is reduced, the degassing and decarburization rates are improved, the alloying is accelerated, and the RH treatment period is shortened.
Description
Technical Field
The application relates to the technical field of steel smelting, in particular to an RH refining furnace and a method for shortening RH treatment period
Background
The basic principle of the existing RH vacuum degassing device is as follows: when the dipping pipe is inserted into the molten steel, the vacuum pump starts to vacuumize, pressure difference is formed between the inside and the outside of the tank, and the molten steel rises to the height equal to the pressure difference from the dipping pipe. At the same time, driving gas is blown in from the ascending pipe, the gas expands due to heating and pressure reduction, isothermal expansion is caused, bubble volume is multiplied, specific gravity of the molten steel is reduced, and the molten steel is driven to ascend and is ejected to the vacuum tank like a fountain. Along with the rupture of the bubbles, the molten steel becomes fine liquid drops, so that the degassing surface area is greatly increased, and the degassing process is accelerated. The gas is separated out from the molten steel and is pumped away, and the degassed molten steel returns to the ladle through the downcomer due to the weight difference. The molten steel which is not degassed continuously enters the vacuum tank from the ascending pipe, so that a continuous circulation process is formed (the schematic diagram of the principle is shown in the attached figure 1).
In actual production, the flow rate of molten steel passing through the riser pipe per unit time determines the period of RH vacuum treatment, and thus the circulation flow rate of the RH vacuum apparatus is the most important technical parameter. By increasing the circulation flow, the RH smelting period can be shortened. However, there is a maximum value of the driving gas blown from the rising pipe, and when the flow rate of the driving gas exceeds the saturation value, the circulation flow rate is not increased any more but is decreased, and the splashing in the vacuum chamber is more serious.
Therefore, how to increase the saturation circulation flow rate of RH is a problem that needs to be solved urgently.
Disclosure of Invention
The application provides an RH refining furnace and a method for shortening an RH treatment period.
In a first aspect, the present application provides an RH refining furnace comprising:
the steel ladle is used for containing molten steel, and a bottom blowing port is formed in the bottom of the steel ladle;
the vacuum chamber is positioned above the steel ladle and is provided with an ascending pipe, a descending pipe and a vacuum chamber, wherein one end of the ascending pipe and one end of the descending pipe respectively extend into the steel ladle, the other end of the ascending pipe is respectively communicated with the vacuum chamber, and the pipe wall of the ascending pipe is provided with a side blowing port;
a first blowing device in fluid communication with the side blowing port for blowing gas into the riser tube through the side blowing port so that molten steel in the ladle is driven through the riser tube into the vacuum chamber;
and the second blowing device is communicated with the bottom blowing port in a fluid mode and is used for blowing air to the molten steel in the ladle through the bottom blowing port by using the second blowing device while the first blowing device blows air into the ascending pipe through the side blowing port, so that more molten steel in the ladle is driven to enter the vacuum cavity through the ascending pipe and returns to the ladle through the descending pipe after vacuum degassing.
In the technical scheme of the application, when the RH refining furnace is used for RH treatment, the driving gas can be blown into the ladle from the second blowing device while the driving gas is blown into the ascending pipe through the first blowing device, and the driving gas blown from the bottom has a larger working stroke than the driving gas blown from the side, so that the RH saturated circulation flow is effectively improved, and the RH treatment period is shortened.
In some embodiments of the present application, an orthographic distance between the bottom blowing port and a centerline of the riser at the bottom of the ladle is smaller than an orthographic distance between the bottom blowing port and a centerline of the downcomer at the bottom of the ladle.
In some embodiments of the present application, the bottom blowing port has a gas outlet inner diameter of 3 to 6mm.
In some embodiments of the present application, the bottom insufflation port has an upper end face with a diameter less than an inner diameter of the riser.
In some embodiments of the present application, the bottom and side blow ports are both air brick.
In a second aspect, the present application provides a method for shortening an RH processing period, comprising the steps of:
molten steel is added into the RH refining furnace described in any one of the above embodiments, and a certain flow of driving gas is blown into the riser through the side blowing port while a certain flow of driving gas is blown into the ladle through the bottom blowing port, so that RH treatment is performed on the molten steel.
In the technical scheme of this application, blow in drive gas in rising pipe through first gas blowing device, blow in drive gas from second gas blowing device in to the ladle, and the drive gas of bottom blowing compares the drive gas of side blowing and has bigger acting stroke to improve RH saturated circulation flow, can show and shorten RH processing cycle.
In some embodiments of the present application, the driving gas is one of argon, nitrogen, and oxygen.
In some embodiments of the present application, the flow rate of the driving gas blown into the riser through the side blow port is 120Nm 3 /h～220Nm 3 /h。
In some embodiments of the present application, the flow rate of the driving gas blown into the ladle through the bottom blowing port is 50NL/min to 300NL/min.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a conventional RH vacuum degassing apparatus.
FIG. 2 is a schematic view of a portion of an RH refining furnace provided in the examples of the present application.
FIG. 3 is a graph showing the results of changes in the Cu content of molten steel at different bottom-blowing flow rates in example 2 of the present application.
FIG. 4 is a graph showing the results of the smelting time of ultra-low carbon steel in RH furnaces of different steel types in example 3 of the present application.
Wherein the reference numbers in the figures are: 1-ladle, 2-vacuum chamber, 3-first blowing device, 4-second blowing device, 11-bottom blowing port, 21-ascending pipe, 22-descending pipe, 23-vacuum chamber, 211-side blowing port.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. The drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the concepts of the application by those skilled in the art with reference to specific embodiments.
Detailed Description
Each example or embodiment is described in a progressive manner, with each example focusing on differences from the other examples.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
The applicant has noticed that in actual production, the flow rate of the steel through the riser per unit time determines the RH vacuum treatment cycle, and therefore the circulation flow rate of the RH vacuum apparatus is taken as the most important technical parameter in each steel mill. By increasing the circulation flow, the mixing time can be reduced, the degassing and decarburization rates can be improved, the alloying can be accelerated, and the RH smelting period can be shortened.
In order to increase the circulation flow rate of the RH vacuum cycle degassing device, measures such as changing the parameters of the dip tube have been proposed in the prior art to increase the circulation flow rate. However, in the actual production process, the driving gas blown in from the rising pipe has a maximum value, and when the flow rate of the driving gas exceeds the saturation value, the circulation flow rate is not increased any more, but is reduced, and the splashing in the vacuum chamber is more serious. Therefore, the circulation flow rate becomes a limiting step in shortening the RH processing cycle, and how to further increase the RH circulation flow rate becomes a bottleneck in restricting the RH processing cycle.
The application provides an RH refining furnace and a method for shortening RH processing period, and the device and the method can improve RH saturation circulation flow rate so as to shorten the RH processing period.
In a first aspect, as shown in fig. 2, the present application provides an RH refining furnace comprising:
the steel ladle 1 is used for containing molten steel, and a bottom blowing port 11 is formed in the bottom of the steel ladle 1;
a vacuum chamber 2 which is positioned above the ladle 1 and is provided with an ascending pipe 21, a descending pipe 22 and a vacuum chamber 23, wherein one end of the ascending pipe 21 and one end of the descending pipe 22 respectively extend into the ladle 1, the other ends are respectively communicated with the vacuum chamber 23, and the pipe wall of the ascending pipe 21 is provided with a side blowing port 211;
a first blowing means 3 in fluid communication with the side blowing port 211 for blowing air into the rising pipe 21 through the side blowing port 211 so that the molten steel in the ladle 1 is driven through the rising pipe 21 into the vacuum chamber 23;
a second gas blowing means 4 in fluid communication with the bottom gas blowing port 11 for blowing gas into the molten steel in the ladle 1 through the bottom gas blowing port 11 using the second gas blowing means 4 while the first gas blowing means 3 blows gas into the riser pipe 21 through the side gas blowing port 211, so that more molten steel in the ladle 1 is driven through the riser pipe 21 into the vacuum chamber 23 and is returned to the ladle 1 through the downcomer pipe 22 after vacuum degassing.
In the technical scheme of this application, above-mentioned RH refining furnace when being used for RH to handle, can blow in drive gas in rising pipe through first gas blowing device, blow in drive gas from second gas blowing device in to the ladle, and the drive gas that blows at the bottom compares the side blow has bigger working stroke to effectively improved RH saturated circulation flow, shortened RH processing cycle.
In the prior art, driving gas is blown into the ascending pipe only through the first blowing device, although the driving gas can completely enter the vacuum cavity through the ascending pipe so as to drive molten steel to carry out continuous circulation treatment, the flow of the introduced driving gas is limited by the diameter of the ascending pipe, so that the improvement of the RH saturated circulation flow by increasing the side blowing flow has certain limitation, and the RH saturated circulation flow cannot be infinitely increased through the way; and if the driving gas is blown into the ladle only through the second blowing device, although the work of the driving gas per unit volume is larger than that of the driving gas blown from the side, the driving gas blown from the bottom can not enter the ascending pipe, and if the flow rate of the bottom blowing gas is too large, part of the driving gas can not enter the ascending pipe to participate in circulation, but the RH saturation circulation flow rate is influenced, so that the RH treatment period is prolonged. Therefore, only when bottom blowing and side blowing are carried out simultaneously, pressure difference generated by side blowing gas in the ascending pipe can enable the bottom blowing gas to enter the ascending pipe more easily to participate in cyclic work, and the bottom blowing gas and the ascending pipe are mutually synergistic, so that the RH saturated cyclic flow can be effectively improved, and the RH processing period is shortened.
In some embodiments of the present application, the orthographic distance between the bottom blow port 11 and the centerline of the riser 21 at the bottom of the ladle 1 is smaller than the orthographic distance between the bottom blow port 11 and the centerline of the downcomer 22 at the bottom of the ladle 1.
In some embodiments, the closer the projection distance of the bottom blowing port to the central line of the ascending tube at the bottom of the steel ladle, the farther the projection distance from the central line of the descending tube at the bottom of the steel ladle, the more easily the bottom-blown gas enters the ascending tube to participate in cyclic work, and the RH saturated cycle flow is improved; if the projection distance between the bottom blowing port and the central line of the ascending pipe at the bottom of the steel ladle is greater than the projection distance between the bottom blowing port and the central line of the descending pipe at the bottom of the steel ladle, part of bottom-blown gas possibly enters the descending pipe, molten steel in the circulating process is influenced to fall back into the steel ladle, and RH saturation circulation flow is reduced instead, so that adverse effects are generated.
In some embodiments of the present application, the gas outlet inner diameter of the bottom blowing port 11 is 3 to 6mm.
In some of the above embodiments, the inner diameter of the gas outlet of the bottom blowing port is set to 3 to 6mm. If the inner diameter of the gas outlet of the bottom blowing port is too small, the flow of bottom-blown gas is limited, and the effect of shortening the RH processing time is limited.
In some embodiments of the present application, the diameter of the upper end face of the bottom blow port 11 is smaller than the inner diameter of the riser pipe 21.
In some of the above embodiments, the diameter of the upper end surface of the bottom blowing port is further limited, and since the driving gas entering from the bottom blowing port firstly enters the ladle but only enters the riser to improve the RH saturation circulation flow, the diameter of the upper section of the bottom blowing port should be smaller than the inner diameter of the riser. If the diameter of the upper end face of the bottom blowing port is larger than the inner diameter of the ascending pipe, the volume of the driving gas entering the ladle is further increased, so that the driving gas cannot completely enter the ascending pipe, and the driving gas which does not enter the ascending pipe can possibly enter the descending pipe, thereby generating adverse effect on molten steel circulation. .
In some embodiments of the present application, both the bottom and side blow ports are air brick.
In some embodiments, the air brick is a new energy-saving and consumption-reducing product with long service life, has reasonable structural design, good thermal stability, erosion resistance and permeability resistance, and has the characteristics of high blowthrough rate, safe and reliable operation, long service life and the like. The air brick can be used as a bottom blowing port and a side blowing port, and has relatively low price, so that the manufacturing cost can be saved.
The application provides a method for shortening an RH treatment period, which comprises the following steps:
molten steel is charged into the RH refining furnace according to any one of claims 1 to 5, and RH-treated by blowing a driving gas into the ladle 1 through the bottom blowing port 11 while blowing a driving gas into the rising pipe 21 through the side blowing port 211 at a constant flow rate.
In the technical scheme of this application, use the RH refining furnace of above-mentioned embodiment to carry out RH processing to the molten steel, can blow in drive gas in the tedge through first gas blowing device, blow in drive gas in to the ladle from the second gas blowing device, make RH saturation circulation flow increase, the pressure difference that produces after the side blow gas gets into the tedge, bottom blow gas in can making the ladle is changeed and is participated in the RH processing circulation in getting into the tedge, bottom blow gas and side blow gaseous phase synergism each other, and the drive gas of bottom blow compares the drive gas of side blow and has bigger acting stroke, RH saturation circulation flow has further been improved from this, show the RH processing cycle of shortening.
In some embodiments of the present application, the driving gas is one of argon, nitrogen, and oxygen.
In the above embodiments, the driving gas may be one of argon, nitrogen and oxygen according to actual production requirements, so as to meet different purposes such as molten steel desulphurization, decarburization, degassing, homogeneous composition, etc.
In some embodiments of the present application, the flow rate of the driving gas blown into the rising pipe 21 through the side blow port 211 is 120Nm 3 /h～220Nm 3 /h。
In some embodiments, the flow rate of the side-blowing driving gas is controlled to 120Nm 3 /h～220Nm 3 In the/h range, the side-blowing driving gas flow rate is significantly higher than that of the bottom-blowing driving gas because the side-blowing driving gas is introduced directly into the riser, but the flow rate is limited by the diameter of the riser, and there is an upper limit for the side-blowing driving gas flow rate because the diameter of the riser cannot be increased infinitely.
In some embodiments of the present application, the flow rate of the driving gas blown into the ladle 1 through the bottom blowing port 11 is 50NL/min to 300NL/min.
In some embodiments, the flow rate of the bottom blowing driving gas is controlled within the range of 50NL/min to 300NL/min, if the flow rate of the bottom blowing driving gas is too small, the RH processing period cannot be shortened, and if the flow rate of the bottom blowing driving gas is too large, a large amount of driving gas can enter a downcomer because the bottom blowing driving gas directly enters a ladle instead of an ascending pipe, so that the normal molten steel circulation process is influenced, and the RH saturated circulation flow is adversely affected.
Hereinafter, the RH refining furnace and the method for shortening the RH treatment cycle according to the present invention will be described in more detail by examples, but the present invention is not limited to these examples at all.
Example 1
An RH refining furnace comprising:
the ladle 1 is used for containing molten steel, and the bottom of the ladle 1 is provided with a bottom air brick 11;
a vacuum chamber 2 which is positioned above the ladle 1 and is provided with an ascending pipe 21, a descending pipe 22 and a vacuum chamber 23, wherein one end of the ascending pipe 21 and one end of the descending pipe 22 respectively extend into the ladle 1, the other ends are respectively communicated with the vacuum chamber 23, and the pipe wall of the ascending pipe 21 is provided with a side air brick 211;
a first blowing means 3 in fluid communication with the side gas brick 211 for blowing gas into the rising pipe 21 through the side gas blowing port 211 so that the molten steel in the ladle 1 is driven through the rising pipe 21 into the vacuum chamber 23;
a second gas blowing means 4 in fluid communication with the bottom gas-permeable bricks 11 for blowing gas into the molten steel in the ladle 1 through the bottom gas-permeable bricks 11 using the second gas blowing means 4 while the first gas blowing means 3 blows gas into the rising pipe 21 through the side gas-permeable bricks 211, so that more molten steel in the ladle 1 is driven through the rising pipe 21 into the vacuum chamber 23 and returned to the ladle 1 through the descending pipe 22 after vacuum degassing;
the bottom air brick 211 is arranged at the orthographic projection position of the central line of the ascending pipe at the bottom of the steel ladle 1;
the inner diameter of a gas outlet of the bottom air brick 211 is 5mm;
the diameter of the upper end face of the bottom air brick 211 is 110mm;
the internal diameter of the riser pipe 21 is 680mm.
When the RH refining furnace is used for RH treatment of molten steel, the gas is blown into the ascending pipe through the side gas permeable bricks, and simultaneously, the gas is blown into the ladle through the bottom gas permeable bricks, the bottom blowing driving gas has a larger working stroke than the side blowing driving gas, and meanwhile, the diameter, the setting position and the gas outlet inner diameter of the upper end surfaces of the bottom gas permeable bricks are further optimized, so that the RH saturated circulation flow can be more effectively improved, and the RH treatment period is further shortened.
Example 2
Steel grade: DC01
The components: c is less than or equal to 0.006 percent, si is less than or equal to 0.03 percent, mn: 0.15-0.25%, P is less than or equal to 0.018%, S is less than or equal to 0.018%, alt: 0.02-0.06%, cu is less than or equal to 0.035%, as is less than or equal to 0.01%, ni is less than or equal to 0.02%, sn is less than or equal to 0.02%, and Cr is less than or equal to 0.03%.
To test the effect of ladle bottom blowing argon on shortening the RH treatment period, an isotopic trace test of Cu was performed on a DC01 steel grade using the RH refining furnace of example 1.
The molten DC01 steel was charged into the RH refining furnace of example 1, and a flow rate of 180Nm was blown into the riser through the side gas permeable bricks 3 And blowing a certain flow of driving gas into the ladle through the bottom air brick while argon gas is used for h, and carrying out RH treatment on the DC01 molten steel.
The flow rate of bottom blowing argon is adjusted within the range of 0-300 NL/min, and 30kg of small copper plates are added from a high-level stock bin after the vacuum degree is pumped to the limit vacuum (less than or equal to 133 Pa). After the copper plate is added with the molten steel, timing and sampling are started, the change of the Cu content in the molten steel under different bottom blowing argon flows is tracked, and the test result is shown in figure 3.
According to the test result, the argon gas with a certain flow is introduced from the bottom, so that the mixing time can be obviously shortened. The reason for this is that: compared with the argon which enters the RH vacuum circulation system through the ascending tube side argon blowing device, the argon blown from the bottom of the ladle has larger working stroke, so that in the RH vacuum circulation system, the saturation circulation flow is higher and the required mixing time is shorter along with the larger bottom argon blowing flow in the range of 0-300 NL/min under the condition that the side argon blowing flow is not changed. Therefore, the RH refining furnace and the method can obviously shorten the RH treatment period.
Example 3
Steel grade: ultra-low carbon steel for partial RH-passing furnace
The tests were carried out on ultra low carbon steel partially passed through the RH furnace using the RH refining furnace of example 1 from 11 months to 2 months of 2021 in 2020.
Part of the ultra-low carbon molten steel passed through the RH furnace was charged into the RH refining furnace of example 1, and blown into the rising pipe through the side air brick at a flow rate of 180Nm 3 Argon gas with a flow rate of 215NL/min was blown into the ladle through the bottom gas permeable brick while the argon gas was blown to the ladle at the same time/h, and RH treatment was performed on a part of the ultra-low carbon molten steel having passed through the RH furnace.
The test results are shown in FIG. 4.
According to the test results, the RH refining furnace and the method can shorten the RH treatment period by 2-4 minutes for different steel types. The reason for this is that: when argon is blown into the bottom of the ladle while argon is blown into the side of the ascending pipe, on one hand, the upper limit of the flow increase of the argon blown into the side of the ascending pipe is broken through, and on the other hand, the argon blown into the bottom has a larger acting stroke than the argon blown into the side, so that the saturation circulation flow during RH treatment can be obviously improved, and the RH treatment period is shortened.
In conclusion, the embodiment of the application can effectively shorten the RH smelting period and improve the RH production efficiency.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. An RH refining furnace, characterized by comprising:
the steel ladle (1) is used for containing molten steel, and a bottom blowing port (11) is formed in the bottom of the steel ladle (1);
the vacuum chamber (2) is positioned above the ladle (1) and is provided with an ascending pipe (21), a descending pipe (22) and a vacuum chamber (23), wherein one end of the ascending pipe (21) and one end of the descending pipe (22) respectively extend into the ladle (1), the other ends of the ascending pipe and the descending pipe are respectively communicated with the vacuum chamber (23), and the pipe wall of the ascending pipe (21) is provided with a side blowing port (211);
a first blowing device (3) in fluid communication with the side blowing port (211) for blowing air into the riser pipe (21) through the side blowing port (211) so that molten steel in the ladle (1) is driven through the riser pipe (21) into the vacuum chamber (23);
a second gas blowing device (4) in fluid communication with the bottom gas blowing port (11) for blowing gas into the molten steel in the ladle (1) through the bottom gas blowing port (11) using the second gas blowing device (4) while the first gas blowing device (3) blows gas into the riser tube (21) through the side gas blowing port (211) so that more molten steel in the ladle (1) is driven through the riser tube (21) into the vacuum chamber (23) and returns to the ladle (1) through the downcomer tube (22) after vacuum degassing.
2. The RH refining furnace according to claim 1, wherein an orthographic projection distance of the bottom blowing port (11) and a centerline of the ascending pipe (21) at the bottom of the ladle (1) is smaller than an orthographic projection distance of the bottom blowing port (11) and a centerline of the descending pipe (22) at the bottom of the ladle (1).
3. An RH refining furnace according to claim 1 or 2, characterized in that the gas outlet inner diameter of the bottom blowing port (11) is 3 mm-6 mm.
4. RH refining furnace according to claim 1 or 2 characterized in that the diameter of the upper end face of the bottom aeration port (11) is smaller than the inner diameter of the riser (21).
5. RH refining furnace according to claim 1 or 2, characterized in that the bottom blowing port (11) and the side blowing ports (211) are gas permeable bricks.
6. A method for shortening RH processing period is characterized by comprising the following steps:
molten steel is charged into the RH refining furnace according to any one of claims 1 to 5, and RH-treated by blowing a driving gas into the ladle (1) through the bottom blowing port (11) while blowing a driving gas into the rising pipe (21) through the side blowing port (211) at a constant flow rate.
7. The method of claim 6, wherein the driving gas is one of argon, nitrogen, and oxygen.
8. A method according to claim 6, characterized in that the flow of driving gas blown into the riser (21) through the side blow ports (211) is 120Nm 3 /h～220Nm 3 /h。
9. Method according to claim 6, characterized in that the flow rate of the driving gas blown into the ladle (1) through the bottom blowing port (11) is 50NL/min to 300NL/min.
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| CN106319156A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | RH refining device for improving decarburization effect and control method thereof |
| CN106636561A (en) * | 2017-03-21 | 2017-05-10 | 中冶赛迪工程技术股份有限公司 | Single-nozzle three-hole vacuum refining furnace and using method thereof |
| CN107419064A (en) * | 2017-08-08 | 2017-12-01 | 华北理工大学 | Immersion jet dam ladle device and the method for improving RH molten steel internal circulating loads |
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