CN101538641A - RH bottom blowing argon vacuum circulating degasser - Google Patents
RH bottom blowing argon vacuum circulating degasser Download PDFInfo
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- CN101538641A CN101538641A CN200910011359A CN200910011359A CN101538641A CN 101538641 A CN101538641 A CN 101538641A CN 200910011359 A CN200910011359 A CN 200910011359A CN 200910011359 A CN200910011359 A CN 200910011359A CN 101538641 A CN101538641 A CN 101538641A
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Abstract
The invention relates to an RH bottom argon blowing vacuum circulating degasser belonging to the technical field of metallurgy and comprising a steel ladle and a vacuum chamber, wherein the bottom wall of the steel ladle is provided with a nozzle or an air brick, and the nozzle or the air brick is connected with an argon blowing device and positioned at one side of the projection of an ascending tube of the vacuum chamber on the bottom wall of the steel ladle. The RH bottom argon blowing vacuum circulating degasser can effectively enhance the circular flow of the RH bottom argon blowing vacuum circulating degasser, increase the internal stirring of the RH vacuum circulating degassing steel ladle, shorten the blending time, accelerate the elimination of deoxidation type inclusions inside the RH vacuum circulating degassing steel ladle and enhance the degassing and the decarburization speed.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of RH bottom blowing argon vacuum circulating degasser.
Background technology
Along with on the market to the needs of ultra low-carbon steel and other special steel kind, the RH vacuum refinement has become one of important external refining equipment.Existing RH vacuum degasser ultimate principle is to be blown into argon gas by the ar gas passage that is installed in upcast, and the molten steel that drives in the ladle under the effect that vacuumizes enters upcast, through behind the vacuum chamber, get back to ladle by downtake again and finish once circulation, thereby realize the batch treatment of molten steel.RH purified major function has the following aspects at present: dehydrogenation under vacuum action, denitrogenation, decarburization, and powder injection desulphurization, dephosphorization, deoxidation is also removed deoxidation type inclusion, evenly molten steel component and temperature etc.In actual production, determining the production efficiency of RH vacuum refinement in the unit time by the molten steel flow of vacuum chamber, thereby each steel mill all the circular flow of RH vacuum degasser as most important technical parameter.By increasing circular flow, can reduce mixing time, improve decarburization, outgassing rate, quicken alloying.
In order to improve the circular flow of RH vacuum circulating degasser, the investigator has proposed to improve circular flow such as measures such as changing the soaking tub parameter, but for the actual RH vacuum degasser that puts into production, circular flow depends primarily on the geometric parameter of RH vacuum degasser, because the effective stroke of the driving argon gas body that enters from upcast is subjected to the soaking tub effect length, in actual production, there is a saturation value in the driving gas that enters from upcast, also there is a maximum value in corresponding circular flow, after the driving gas flow surpasses saturation value, circular flow no longer increases, and reduces on the contrary.Thereby circular flow becomes a restricted link that improves the RH refining efficiency.Meanwhile; because the surface of the molten steel in vacuum chamber unprotect slag covers, the inclusion that generates after the deoxidation is mainly removed in ladle, and inclusion removal speed is mainly determined by ascent rate; thereby have only the quickening floating foreign, could shorten the deoxidation treatment time.
Present existing RH vacuum degasser circular flow after the Argon amount reaches capacity no longer continues to increase, and becomes the bottleneck that restriction improves RH refining production efficiency so how further to increase circular flow.Because circulating of molten steel is to carry out under the buoyancy-driven that is blown into the argon gas body in the RH vacuum degasser, actual argon gas working stroke in upcast is constant.And because the upcast diameter dimension can not be infinitely great, thereby exist a saturated Argon amount; The saturated circular flow that how to improve de-gassing vessel becomes present urgent problem.
Summary of the invention
At above technical problem, the invention provides a kind of RH bottom blowing argon vacuum circulating degasser, to realize improving saturated circular flow this purpose of RH vacuum degasser.
RH bottom blowing argon vacuum circulating degasser of the present invention comprises ladle and vacuum chamber, the vacuum chamber bottom is provided with upcast and downtake, upcast connects side-blown argon device, and main points are that the ladle diapire is provided with nozzle or gas permeable brick, and nozzle or gas permeable brick connect bottom Argon device.
Above-mentioned bottom Argon device comprises variable valve, Argon pipe and trip valve.Nozzle or gas permeable brick are connected on the Argon pipe, and the Argon pipe is provided with trip valve and variable valve.
Nozzle on the ladle diapire or gas permeable brick are at least one; The joining of upcast medullary ray and ladle diapire is the upcast subpoint, and the joining of downtake medullary ray and ladle diapire is the downtake subpoint; The distance of nozzle or gas permeable brick and upcast subpoint is less than the distance of this nozzle or gas permeable brick and downtake subpoint, and promptly nozzle or gas permeable brick are positioned at the side of upcast in the projection of ladle diapire.
Wherein the pneumatic outlet internal diameter of nozzle is 2～5mm; The diameter of gas permeable brick upper surface is less than the upcast internal diameter.
The using method of device of the present invention is:
Adopt said apparatus, the bottom Argon device that nozzle or gas permeable brick are connected is connected with outside confession argon device; When the RH ladle needs Argon, simultaneously to ladle argon-blown, perhaps pass through ladle bottom Argon device separately to ladle argon-blown by blow side argon device and ladle bottom Argon device; During Argon, the argon flow amount in the ladle bottom Argon device is 100～500NL/min.
The present invention is directed to existing RH vacuum circulating degasser and improve, at the ladle diapire of RH vacuum degasser bottom Argon device is installed, by being blown into argon gas from the ladle diapire, the molten steel ladle that drives the upcast below moves upward.Compare with the argon gas body that enters the RH device through upcast side-blown argon device, the argon gas body that is blown into by the ladle diapire has bigger working stroke, thereby under the constant condition of total Argon amount, adopt the circular flow when of the present invention bigger than the circular flow of present RH vacuum degasser, saturated circular flow raising can reach more than 44%, under the identical condition of argon flow amount, circular flow can improve more than 74%.In addition, the present invention can also realize following purpose: strengthen the stirring in the ladle, reduce mixing time; Acceleration is promoted the collision of inclusion in the ladle to grow up by the bubble absorption floating foreign, shortens the RH deoxidation treatment time.
Device of the present invention is in actually operating, but flexible combination Argon mode both can adopt upcast side-blown device and ladle bottom Argon device composite air supply, also can adopt ladle bottom Argon device air feed separately.Adopt device of the present invention can effectively improve the circular flow of RH vacuum circulating degasser; Strengthen the stirring in the RH vacuum circulation degassing ladle; Shorten mixing time; Accelerate the removal of deoxidation type inclusion in the ladle; Improve the degassing, decarbonization rate.
Description of drawings
Fig. 1 is the synoptic diagram of existing RH vacuum circulating degasser, among the figure 1, side-blown argon device, and 2, upcast, 3, ladle, 4, downtake, 5, vacuum chamber.
Fig. 2 is the RH bottom blowing argon vacuum circulating degasser synoptic diagram in the embodiment of the invention 1, among the figure 1, side-blown argon device, and 2, upcast, 3, ladle, 4, downtake, 5, vacuum chamber, 6, nozzle, 7, the ladle medullary ray.
Fig. 3 is the structural representation of ladle bottom Argon device in the embodiment of the invention, among the figure 8, variable valve, and 9, the Argon pipe, 10, trip valve.
Fig. 4 is the RH bottom blowing argon vacuum circulating degasser synoptic diagram in the embodiment of the invention 2, among the figure 1, side-blown argon device, and 2, upcast, 3, ladle, 4, downtake, 5, vacuum chamber, 7, the ladle medullary ray, 11, gas permeable brick.
Fig. 5 is the dimensional structure synoptic diagram of the RH bottom blowing argon vacuum circulating degasser in the embodiment of the invention 1, wherein D
VacBe vacuum chamber internal diameter, D
LegBe soaking tub (upcast or downtake) internal diameter, H
LBe molten steel ladle height, H
InThe soaking tub depth of penetration, D
LupBe ladle internal diameter suitable for reading, D
LdownBe ladle end opening internal diameter, S
NoFor steel ladle bottom argon blowing position (center of the position at nozzle or gas permeable brick place) apart from ladle diapire width between centers.
Fig. 6 is the dimensional structure synoptic diagram of the RH bottom blowing argon vacuum circulating degasser in the embodiment of the invention 3, wherein D
VacBe vacuum chamber internal diameter, D
LegBe soaking tub (upcast or downtake) internal diameter, H
LBe molten steel ladle height, H
InThe soaking tub depth of penetration, D
LupBe ladle internal diameter suitable for reading, D
LdownBe ladle end opening internal diameter, S
No1And S
No2Be respectively steel ladle bottom argon blowing position 1 and steel ladle bottom argon blowing position 2 (center of the position at two nozzles or gas permeable brick place) distance apart from ladle diapire center.
Fig. 7 is the contrast effect graphic representation of the circular flow-total Argon amount of the embodiment of the invention 1, embodiment 2, embodiment 3 during with RH vacuum circulating degasser work at present, a, embodiment 3, b, embodiment 2 among the figure, c, embodiment 1, d, existing RH vacuum circulating degasser.
Embodiment
Nozzle in the embodiment of the invention or gas permeable brick require and can normally use under the environment of 1600 ℃ of temperature.
RH bottom blowing argon vacuum circulating degasser structure comprises ladle 3 and vacuum chamber 5 as shown in Figure 2, and vacuum chamber 5 bottoms are provided with upcast 2 and downtake 4, and upcast 2 connects side-blown argon device 1.Wherein ladle 3 diapires are provided with nozzle 6, and nozzle 6 connects bottom Argon device.By ladle diapire center, and be ladle medullary ray 7 with the upcast medullary ray straight line parallel with the downtake medullary ray.
Ladle bottom Argon device as shown in Figure 3.Bottom Argon device comprises variable valve 8, Argon pipe 9 and trip valve 10.Nozzle 6 is communicated with Argon pipe 9, and Argon pipe 9 is provided with trip valve 10 and variable valve 8.
The ladle diapire is provided with a nozzle 6, and nozzle 6 connects bottom Argon device; Nozzle 6 is positioned at the side of upcast 2 in ladle 3 diapire projections, the i.e. left side of ladle medullary ray 7; The medullary ray of nozzle 6 endoporus and upcast 2 medullary rays are located along the same line.
The pneumatic outlet internal diameter of nozzle is 2mm.Nozzle can normally use under the environment of 1600 ℃ of temperature.
The dimensional structure of RH bottom blowing argon vacuum circulating degasser as shown in Figure 5, D
VacBe vacuum chamber internal diameter, D
LegBe soaking tub (upcast or downtake) internal diameter, H
LBe molten steel ladle height, H
InSoaking tub (upcast or downtake) depth of penetration, D
LupBe ladle internal diameter suitable for reading, D
LdownBe ladle end opening internal diameter, S
NoBe steel ladle bottom argon blowing position (center of nozzle position) distance apart from the ladle center.Each dimensional parameters is as shown in table 1.
Table 1
| Parameter name | D Vac | D leg | H L | H in | D Lup | D Ldown | S no |
| Size (mm) | 1870 | 500 | 3000 | 480 | 3190 | 2860 | 535 |
The bottom Argon device that nozzle is connected is connected for the argon device with outside; When the RH ladle needs Argon, to ladle argon-blown, during Argon, the argon flow amount in the ladle bottom Argon device is 200NL/min by blow side argon device and ladle bottom Argon device, argon flow amount in the side-blown argon device is 1000NL/min, and total Argon amount is 1200NL/min (1.2Nm
3/ min), circular flow is 76.3t/min.
Under the Argon mode of existing RH vacuum circulating degasser, promptly close ladle bottom Argon device, only by side-blown device Argon, argon flow amount is 1200NL/min (1.2Nm
3/ min), circular flow is 53.3NL/min.And saturated Argon amount is 1600NL/min (1.6Nm
3/ min), corresponding saturated circular flow is 64.9t/min.
Experiment showed, that the circular flow under the present embodiment condition improves more than 30% than the circular flow of existing RH vacuum circulating degasser under the identical situation of total Argon amount.And the saturated circular flow than existing RH vacuum circulating degasser improves more than 18%.Contrast effect as shown in Figure 7.
RH bottom blowing argon vacuum circulating degasser structure is provided with gas permeable brick 11 at ladle 3 diapires as shown in Figure 4, and gas permeable brick 6 connects the Argon device, and other parts are with embodiment 1.
Ladle bottom Argon device as shown in Figure 3.Bottom Argon device comprises variable valve 8, Argon pipe 9 and trip valve 10.Gas permeable brick 6 is communicated with Argon pipe 9, and Argon pipe 9 is provided with trip valve 10 and variable valve 8.
The ladle diapire is provided with a gas permeable brick 11, and gas permeable brick 11 connects bottom Argon device; Gas permeable brick 11 is positioned at the side of upcast 2 in ladle 3 diapire projections, the i.e. left side of ladle medullary ray 7; The medullary ray of gas permeable brick 11 endoporus and upcast 2 medullary rays are located along the same line.Wherein the diameter of gas permeable brick 11 upper surfaces is 120mm.
The scantlings of the structure of RH bottom blowing argon vacuum circulating degasser is with embodiment 1.
The bottom Argon device that gas permeable brick is connected is connected for the argon device with outside; When the RH ladle needs Argon, to ladle argon-blown, during Argon, the argon flow amount in the ladle bottom Argon device is 500NL/min by blow side device and ladle bottom Argon device, argon flow amount in the side-blown argon device is 900NL/min, and total Argon amount is 1400NL/min (1.4Nm
3/ min), circular flow is 85.68t/min.
Argon mode by existing RH vacuum circulating degasser is carried out Argon, promptly closes ladle bottom Argon device, and only by side-blown argon device Argon, argon flow amount is 1400NL/min (1.4Nm
3/ min), circular flow is 63.5t/min.And saturated Argon amount is 1600NL/min (1.6Nm
3/ min), corresponding saturated circular flow is 64.9t/min.
Experiment showed, that the circular flow under the present embodiment improves more than 35% than the circular flow of existing RH vacuum circulating degasser under the identical situation of total Argon amount.And the saturated circular flow than existing RH vacuum circulating degasser improves more than 32%.
The RH bottom blowing argon vacuum circulating degasser is with embodiment 1, and difference is: the ladle diapire is provided with two nozzles, and the pneumatic outlet internal diameter of nozzle is 5mm; Each nozzle all connects a bottom Argon device separately; Two nozzles are positioned at the side of upcast in the projection of ladle diapire, the i.e. left side of ladle medullary ray 7; Two nozzle endoporus centers and diapire center are on same straight line.
The dimensional structure of RH bottom blowing argon vacuum circulating degasser as shown in Figure 6, S wherein
No1Be the distance of first ladle bottom Argon position (center of the position at nozzle place) apart from the ladle center, and S
No1=535mm; S
No2Be the distance of second ladle bottom Argon position (center of the position at nozzle place) apart from the ladle center, and S
No2=285mm.Other sizes are with embodiment 1.
The bottom Argon device that nozzle is connected is connected for the argon device with outside; Close side-blown argon device, when the RH ladle needed Argon, by being installed in two nozzle Argons of ladle diapire, wherein the argon flow amount of each nozzle was 400NL/min, and total Argon amount is 800NL/min (0.8Nm
3/ min), circular flow is 93.2t/min.
Circular flow under the present embodiment improves more than 74% than the circular flow of existing RH vacuum circulating degasser; And the saturated circular flow than existing RH vacuum circulating degasser improves more than 44%.
Claims (4)
1, a kind of RH bottom blowing argon vacuum circulating degasser, comprise ladle and vacuum chamber, the vacuum chamber bottom is provided with upcast and downtake, and upcast is connected with side-blown argon device, it is characterized in that: be provided with nozzle or gas permeable brick at the ladle diapire, nozzle or gas permeable brick are connected with bottom Argon device.
2, a kind of RH bottom blowing argon vacuum circulating degasser according to claim 1 is characterized in that described bottom Argon device comprises variable valve, Argon pipe and trip valve, and described nozzle or gas permeable brick are connected on the Argon pipe.
3, a kind of RH bottom blowing argon vacuum circulating degasser according to claim 1 is characterized in that the described vertical range that is arranged on the vertical range of nozzle on the ladle diapire or gas permeable brick and upcast medullary ray less than this nozzle or gas permeable brick and downtake medullary ray.
4, a kind of RH bottom blowing argon vacuum circulating degasser according to claim 1, the pneumatic outlet internal diameter that it is characterized in that described nozzle is 2～5mm; The diameter of described gas permeable brick upper surface is less than the internal diameter of vacuum chamber upcast.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910011359A CN101538641A (en) | 2009-04-30 | 2009-04-30 | RH bottom blowing argon vacuum circulating degasser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910011359A CN101538641A (en) | 2009-04-30 | 2009-04-30 | RH bottom blowing argon vacuum circulating degasser |
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| Publication Number | Publication Date |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605141A (en) * | 2012-03-09 | 2012-07-25 | 河南科技大学 | Improved Ruhrstahl Heraeus(RH) refining device |
| CN102816894A (en) * | 2012-08-22 | 2012-12-12 | 河北钢铁股份有限公司邯郸分公司 | Control method for enhancing RH vacuum circulation decarburization rate |
| CN103266200A (en) * | 2013-05-15 | 2013-08-28 | 中冶南方工程技术有限公司 | Energy-saving environment-friendly RH (relative humidity) vacuum refining device |
| CN103397145A (en) * | 2013-07-30 | 2013-11-20 | 东北大学 | Vacuum cyclic degassing refining device for molten steel |
| CN103397144A (en) * | 2013-07-30 | 2013-11-20 | 东北大学 | Vacuum cyclic degassing single-nozzle refining device for molten steel |
| CN103866091A (en) * | 2014-03-31 | 2014-06-18 | 中冶南方工程技术有限公司 | Method and device for supplying nitrogen and argon gases by virtue of RH (Ruhrstahl Heraeus) vacuum chamber insert tube |
| 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 |
| CN109652615A (en) * | 2019-01-25 | 2019-04-19 | 钢铁研究总院 | A method of improving RH refining process molten steel circular flow |
| CN111426811A (en) * | 2020-04-10 | 2020-07-17 | 南京钢铁股份有限公司 | Method for evaluating capacity of RH refining furnace for removing inclusions in vacuum |
| CN112646954A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | RH refining method for improving removal rate of ultra-low carbon steel inclusions |
| CN113957203A (en) * | 2021-12-21 | 2022-01-21 | 太原科技大学 | Multifunctional non-centrosymmetric vacuum refining equipment |
| CN114752729A (en) * | 2022-04-11 | 2022-07-15 | 江苏维卡金属合金材料有限公司 | Duplex smelting device for Fe-Ni42 alloy |
| CN115232922A (en) * | 2022-07-13 | 2022-10-25 | 湖南华菱涟源钢铁有限公司 | RH refining furnace and method for shortening RH treatment period |
-
2009
- 2009-04-30 CN CN200910011359A patent/CN101538641A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605141A (en) * | 2012-03-09 | 2012-07-25 | 河南科技大学 | Improved Ruhrstahl Heraeus(RH) refining device |
| CN102816894A (en) * | 2012-08-22 | 2012-12-12 | 河北钢铁股份有限公司邯郸分公司 | Control method for enhancing RH vacuum circulation decarburization rate |
| CN103266200A (en) * | 2013-05-15 | 2013-08-28 | 中冶南方工程技术有限公司 | Energy-saving environment-friendly RH (relative humidity) vacuum refining device |
| CN103397145A (en) * | 2013-07-30 | 2013-11-20 | 东北大学 | Vacuum cyclic degassing refining device for molten steel |
| CN103397144A (en) * | 2013-07-30 | 2013-11-20 | 东北大学 | Vacuum cyclic degassing single-nozzle refining device for molten steel |
| CN103866091A (en) * | 2014-03-31 | 2014-06-18 | 中冶南方工程技术有限公司 | Method and device for supplying nitrogen and argon gases by virtue of RH (Ruhrstahl Heraeus) vacuum chamber insert tube |
| CN103866091B (en) * | 2014-03-31 | 2016-03-02 | 中冶南方工程技术有限公司 | A kind of RH vacuum chamber tubular stinger nitrogen argon air supply method and device |
| 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 |
| CN109652615A (en) * | 2019-01-25 | 2019-04-19 | 钢铁研究总院 | A method of improving RH refining process molten steel circular flow |
| CN111426811A (en) * | 2020-04-10 | 2020-07-17 | 南京钢铁股份有限公司 | Method for evaluating capacity of RH refining furnace for removing inclusions in vacuum |
| CN112646954A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | RH refining method for improving removal rate of ultra-low carbon steel inclusions |
| CN113957203A (en) * | 2021-12-21 | 2022-01-21 | 太原科技大学 | Multifunctional non-centrosymmetric vacuum refining equipment |
| CN113957203B (en) * | 2021-12-21 | 2022-03-15 | 太原科技大学 | Multifunctional non-centrosymmetric vacuum refining equipment |
| CN114752729A (en) * | 2022-04-11 | 2022-07-15 | 江苏维卡金属合金材料有限公司 | Duplex smelting device for Fe-Ni42 alloy |
| CN115232922A (en) * | 2022-07-13 | 2022-10-25 | 湖南华菱涟源钢铁有限公司 | RH refining furnace and method for shortening RH treatment period |
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Open date: 20090923 |