CN103397144A - Vacuum cyclic degassing single-nozzle refining device for molten steel - Google Patents
Vacuum cyclic degassing single-nozzle refining device for molten steel Download PDFInfo
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- CN103397144A CN103397144A CN201310323725XA CN201310323725A CN103397144A CN 103397144 A CN103397144 A CN 103397144A CN 201310323725X A CN201310323725X A CN 201310323725XA CN 201310323725 A CN201310323725 A CN 201310323725A CN 103397144 A CN103397144 A CN 103397144A
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Abstract
The invention discloses a vacuum cyclic degassing single-nozzle refining device for molten steel, which belongs to the technical field of ferrous metallurgy. According to the invention, the flowing of the molten steel can be more stable, and the cyclic flow rate and the refining efficiency of the molten steel can be effectively improved. The vacuum cyclic degassing single-nozzle refining device comprises a steel ladle, a vacuum chamber and a soaking tube, wherein the bottom of the vacuum chamber is communicated with one end of the soaking tube, and the other end of the soaking tube is located in the steel ladle; a plurality of argon side-spraying nozzles are formed in the wall of the soaking tube, and are uniformly distributed in the circumference direction in the wall of the soaking tube; a plurality of argon bottom-spraying nozzles are formed in the bottom of the steel ladle, are opposite to the lower-end opening of the soaking tube, and are circularly arrayed and uniformly distributed in the circumference direction; an argon centre-spraying nozzle is formed in the centre of the bottom of the steel ladle.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly relate to a kind of molten steel vacuum circulation degassing list mouth a refining unit.
Background technology
At present for obtaining ultra low-carbon steel and other special steel kind, the method that can take has RH method and REDA method, namely to the method for the vacuum circulation degassing refining of molten steel, vacuum circulation degassing a refining unit for existing employing RH method, its principle of work is to be blown into argon gas by upcast, and under the effect that vacuumizes, the molten steel that drives in ladle enters in vacuum chamber by upcast simultaneously, then molten steel is got back in ladle by downtake by vacuum chamber again, completes the circulation of a molten steel.
The vacuum circulation degassing a refining unit of existing employing RH method, major function have dehydrogenation, denitrogenation, decarburization, powder injection desulphurization, powder dephosphorization, deoxidation and remove deoxidation type inclusion, even molten steel component and temperature etc.In actual production, determining the efficiency of molten steel vacuum circulation degassing refining in the unit time by the molten steel flow of vacuum chamber, thereby each steel mill all the circular flow of vacuum circulation degassing a refining unit as most important technical parameter.
But the existing vacuum circulation degassing a refining unit of RH method that adopts still has the following disadvantages:
1, can be subject to the impact of circular flow due to the refining efficiency of molten steel, and there is a higher limit in the molten steel circular flow of existing vacuum circulation degassing a refining unit, when the argon gas that is blown into when upcast surpassed saturation value, circular flow no longer increased, and reduces on the contrary;
2, because the surface of the molten steel in vacuum chamber unprotect slag covers, the inclusion that generates after deoxidation is mainly removed in ladle, and the ascent rate of deoxidation type inclusion has directly affected the length of deaeration time, but existing vacuum circulation degassing a refining unit can't effectively increase the ascent rate of deoxidation type inclusion, namely can't effectively improve the removal speed of deoxidation type inclusion;
3, existing vacuum circulation degassing a refining unit can't effectively solve the problem in dead band in ladle.
For the REDA method, be that upcast and downtake in the vacuum circulation degassing a refining unit of employing RH method are merged into an independent soaking tub, also be known as single-mouth refining furnace.Single-mouth refining furnace is to be blown into argon gas by ladle bottom, and the floating by argon gas stirs molten steel, and the molten steel that drives simultaneously in ladle moves upward, and realizes the circulation of molten steel between ladle, soaking tub and vacuum chamber.
Single-mouth refining furnace is compared with the vacuum circulation degassing a refining unit that adopts the RH method, structure is simpler, the working stroke of argon gas bubbles is larger, the circular flow of molten steel is larger, temperature drop in the molten steel working cycle is little, degassed rate is higher, but the same Shortcomings part of single-mouth refining furnace: molten steel is in soaking tub internal recycle flow process, the disorder of molten steel stream easily occurs, molten steel in rising easily occurs to collide with molten steel in descending and blended together, thereby cause the reduction of the circular flow of molten steel, the refining efficiency of molten steel is reduced.
Summary of the invention
, for the problem that prior art exists, the invention provides a kind of circular flow and effective molten steel vacuum circulation degassing list mouth a refining unit that improves liquid steel refining efficiency that Molten Steel Flow is more stable, effectively improve molten steel that make.
To achieve these goals, the present invention adopts following technical scheme: a kind of molten steel vacuum circulation degassing list mouth a refining unit, comprise ladle, vacuum chamber and soaking tub, the bottom of described vacuum chamber is connected with an end of soaking tub, and the other end of soaking tub is positioned at ladle; Be characterized in being provided with some side spray argon mouths on the tube wall of soaking tub, side spray argon mouth is uniformly distributed on the tube wall circumferential direction of soaking tub; Be provided with some end spray argon mouths at the ladle bottom relative with the soaking tub lower end mouth of pipe, spray the rounded arrangement of argon mouth and be uniformly distributed in a circumferential direction at the end; Be provided with center spray argon mouth in the ladle bottom center.
Described ladle is round shape or oval cylinder.
The medullary ray of described ladle and the medullary ray of vacuum chamber coincide.
Described center spray argon mouth is at least one.
Beneficial effect of the present invention:
Side spray argon mouth on soaking tub of the present invention coordinates the operation of spray argon with the end of ladle bottom spray argon mouth, make molten steel realize flowing to vacuum chamber by ladle through the soaking tub inner tubal wall, molten steel can be by circumferential center flow in vacuum chamber, flow to again the soaking tub center, and along the soaking tub center, flow back to ladle downwards, be that molten steel circulates along the mode that the tube wall ring-type rises, from soaking tub center column, descends, the molten steel stable circulation is flowed, make the circular flow of molten steel remain on very high level; Sprayed the argon gas of the appropriate amount of argon mouth ejection by center, can form more little argon gas bubbles under the impact of decline molten steel, increased thus the surface-area of argon gas bubbles; Common spray argon operation by side spray argon mouth, end spray Ya Zuiji center spray argon mouth, not only strengthened the blending dynamics of molten steel, shortened the mixing time of molten steel, more help the stirring of molten steel in ladle, thereby increased the efficiency of molten steel decarburization, denitrogenation, effectively improve the removal speed of deoxidation type inclusion, finally improved the refining efficiency of molten steel.
Description of drawings
Fig. 1 is a kind of molten steel vacuum circulation degassing list mouth a refining unit structural representation of the present invention;
Fig. 2 is A in Fig. 1-A sectional view;
Fig. 3 is Molten Steel Flow schematic diagram in the present invention;
In figure, 1-ladle, 2-vacuum chamber, 3-soaking tub, 4-side spray argon mouth, 5-end spray argon mouth, 6-center spray argon mouth.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, 2, a kind of molten steel vacuum circulation degassing list mouth a refining unit, comprise ladle 1, vacuum chamber 2 and soaking tub 3, described soaking tub 3 is set to center and has the cylinder barrel shaped structure of through hole, the bottom of described vacuum chamber 2 is connected with an end of soaking tub 3, and the other end of soaking tub 3 is positioned at ladle 1; Be provided with eight side spray argon mouths 4 on the tube wall of soaking tub 3, side spray argon mouth 4 is uniformly distributed on the tube wall circumferential direction of soaking tub 3; Spray argon mouth 5 at the bottom of the ladle bottom relative with the soaking tub 3 lower end mouths of pipe is provided with eight, spray argon mouth 5 rounded arrangements and be uniformly distributed in a circumferential direction at the end, at ladle 1 bottom centre place, is provided with Yi Ge center spray argon mouth 6.
Described ladle 1 is round shape.
The medullary ray of the medullary ray of described ladle 1 and vacuum chamber 2 coincides.
Below in conjunction with a description of drawings use procedure of the present invention:
at first, the molten steel that needs refining is poured in ladle 1, made the lower end port of soaking tub 3 be positioned at molten steel, start the vaccum-pumping equipment of vacuum chamber 2, under the effect of pressure, molten steel can be in soaking tub 3 enters vacuum chamber 2, and the molten steel of this moment can't circulate, open the end spray argon mouth 5 of ladle bottom, argon gas is blown in molten steel from end spray argon mouth 5, this moment, molten steel can be under the drive of argon gas bubbles, from the interior soaking tub 3 that flows to of ladle 1, and along the inner tubal wall of soaking tub 3, move upward, until enter in vacuum chamber 2, can be from vacuum chamber 2 surroundings to vacuum chamber 2 center flow at the interior molten steel of vacuum chamber 2, flowed to again the center of soaking tub 3 downwards by the center of vacuum chamber 2, and along the center of soaking tub 3, continue to flow back to downwards in ladle 1, molten steel just formed and circulated this moment, be that molten steel rises along the tube wall ring-type, the mode that descends from soaking tub 3 center columns circulates.
Open the side spray argon mouth 4 on soaking tub 3, argon gas is blown in molten steel from side spray argon mouth 4, under the drive of argon gas bubbles, has accelerated the circulation flow rate of original molten steel, thereby has increased the circular flow of molten steel; Spray under the common spray argon effect of argon mouth 5 at side spray argon mouth 4 and the end, molten steel is under very high circular flow state, and has effectively avoided the generation of molten steel turbulent flow, make circulating of molten steel keep stable.
Open the center spray argon mouth 6 of ladle bottom, can be the process that rises from the argon gas bubbles of center spray argon mouth 6 ejections, be subject to the flow downward impact of molten steel of soaking tub 3 centers, original argon gas bubbles can form the small bubbles of more dispersion, and then has increased the surface-area of argon gas bubbles; Due to the increase of argon gas bubbles surface-area and argon gas bubbles quantity, directly accelerated the stirring of ladle 1 interior molten steel and all mixed, accelerated the speed of absorption deoxidation type inclusion, thereby and drive fast the deoxidation type inclusion floating and improved the removal efficiency of deoxidation type inclusion; But because the argon gas of center spray argon mouth 6 ejections can produce certain impact to the molten steel that soaking tub 3 centers flow downward, constant in order to guarantee the molten steel circular flow, suitably the straying quatity of reduction center spray argon mouth 6 argon gas, increase the straying quatity that sprays argon mouth 5 in the end simultaneously., in the situation that the Argon amount is identical, at molten steel,, along the rising of tube wall ring-type, under the mode that the circulates effect of soaking tub 3 center columns declines, has avoided the appearance of Argon saturated phenomenon, thereby effectively improved the circular flow of molten steel.
Spray the center Argon effect of argon mouth 6 by center, realized miniaturization and the dispersion of argon gas bubbles, increased the surface-area of argon gas bubbles, thereby realized efficient degassing and the efficient purpose of removing deoxidation type inclusion, finally improved the refining efficiency of molten steel.
Under the common spray argon effect of side spray argon mouth 4, end spray argon mouth 5 and center spray argon mouth 6, in the present invention, the Molten Steel Flow schematic diagram as shown in Figure 3.
Claims (4)
1. a molten steel vacuum circulation degassing list mouth a refining unit, comprise ladle, vacuum chamber and soaking tub, and the bottom of described vacuum chamber is connected with an end of soaking tub, and the other end of soaking tub is positioned at ladle; It is characterized in that being provided with some side spray argon mouths on the tube wall of soaking tub, side spray argon mouth is uniformly distributed on the tube wall circumferential direction of soaking tub; Be provided with some end spray argon mouths at the ladle bottom relative with the soaking tub lower end mouth of pipe, spray the rounded arrangement of argon mouth and be uniformly distributed in a circumferential direction at the end; Be provided with center spray argon mouth in the ladle bottom center.
2. a kind of molten steel vacuum circulation degassing list mouth a refining unit according to claim 1, it is characterized in that: described ladle is round shape or oval cylinder.
3. a kind of molten steel vacuum circulation degassing list mouth a refining unit according to claim 1, it is characterized in that: the medullary ray of described ladle and the medullary ray of vacuum chamber coincide.
4. a kind of molten steel vacuum circulation degassing list mouth a refining unit according to claim 1 is characterized in that: described center spray argon mouth is at least one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310323725XA CN103397144A (en) | 2013-07-30 | 2013-07-30 | Vacuum cyclic degassing single-nozzle refining device for molten steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310323725XA CN103397144A (en) | 2013-07-30 | 2013-07-30 | Vacuum cyclic degassing single-nozzle refining device for molten steel |
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| CN201310323725XA Pending CN103397144A (en) | 2013-07-30 | 2013-07-30 | Vacuum cyclic degassing single-nozzle refining device for molten steel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538641A (en) * | 2009-04-30 | 2009-09-23 | 东北大学 | RH bottom blowing argon vacuum circulating degasser |
| CN202830077U (en) * | 2012-08-24 | 2013-03-27 | 马钢(集团)控股有限公司 | Straight barrel type vacuum refining device |
| CN203393185U (en) * | 2013-07-30 | 2014-01-15 | 东北大学 | Vacuum circulating degassing single-nozzle refining device for molten steel |
-
2013
- 2013-07-30 CN CN201310323725XA patent/CN103397144A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538641A (en) * | 2009-04-30 | 2009-09-23 | 东北大学 | RH bottom blowing argon vacuum circulating degasser |
| CN202830077U (en) * | 2012-08-24 | 2013-03-27 | 马钢(集团)控股有限公司 | Straight barrel type vacuum refining device |
| CN203393185U (en) * | 2013-07-30 | 2014-01-15 | 东北大学 | Vacuum circulating degassing single-nozzle refining device for molten steel |
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Application publication date: 20131120 |