CN101418366B - A method for re-blowing and dehydrogenating the top and bottom of a ladle refining furnace - Google Patents
A method for re-blowing and dehydrogenating the top and bottom of a ladle refining furnace Download PDFInfo
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- CN101418366B CN101418366B CN2007100474243A CN200710047424A CN101418366B CN 101418366 B CN101418366 B CN 101418366B CN 2007100474243 A CN2007100474243 A CN 2007100474243A CN 200710047424 A CN200710047424 A CN 200710047424A CN 101418366 B CN101418366 B CN 101418366B
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Abstract
一种钢包精炼炉顶底复吹脱氢方法，其包括如下步骤：a)钢包精炼炉钢包进入加热工位，降电极，接通底吹管路，打开透气阀，进行底吹氩气搅拌，正常冶炼；b)冶炼完毕，钢液中除氢外其他成分基本合格后，控制底吹透气砖的流量≤10m3/min，压力0.01～10MPa，打开顶吹气管路阀门顶吹氩气，气体压力0.01～10Mpa，流量≤10m3/min，时间≤60min，在炉内形成良好的脱氢条件；c)顶底复吹5～60min，升电极，同时停止顶、底吹，或者只停止顶吹气体，继续底吹；d)停止全部操作，进入下一工位。本发明可以实现不经过真空流程脱除钢中氢，简化炼钢工艺流程，节约生产成本，提高生产效率。
A method for re-blowing and dehydrogenating the top and bottom of a ladle refining furnace, which includes the following steps: a) The ladle of the ladle refining furnace enters the heating station, lowers the electrode, connects the bottom blowing pipeline, opens the breather valve, and performs bottom blowing argon stirring, normally Smelting; b) After the smelting is completed and other components in the molten steel except hydrogen are basically qualified, the flow rate of the bottom blowing air brick is controlled to be ≤10m 3 /min and the pressure is 0.01~10MPa. 0.01～10Mpa, flow rate ≤10m 3 /min, time ≤60min, forming good dehydrogenation conditions in the furnace; c) Top and bottom re-blowing for 5-60min, raise the electrode, stop top and bottom blowing at the same time, or only stop top blowing Gas, continue to blow at the bottom; d) Stop all operations and enter the next station. The invention can realize the removal of hydrogen in steel without a vacuum process, simplifies the steelmaking process, saves production cost and improves production efficiency.
Description
Technical field
The present invention relates to steelmaking technical field, particularly a kind of ladle refining furnace (LF stove) top and bottom combined blown dehydrogenation method.
Background technology
Hydrogen is the harmful element in the steel, and its existence greatly endangers the performance of steel, causes phenomenons such as hydrogen embrittlement, white point.A large number of experiments show that its performance hazards to steel can be ignored substantially when hydrogen richness is lower than 2ppm in the steel.
Steel-making refining process method of dehydrogenating has physical method and chemical process.
Physical method is the vacuum dehydrogenation method, comprise VD method, RH method, DH method of publication etc., its common feature is that the concentration difference of hydrogen in the gas-liquid two-phase is increased, and has greatly improved the dynamic conditions of dehydrogenation, thereby has made the hydrogen richness in the steel drop to extremely low-level.
The chemical process dehydrogenation mainly by at ladle refining furnace (LF stove) thus go up and in stove, to spray into the purpose that chemical powder reaches dehydrogenation by blowing device, adopt the dehydrogenation of injection metallurgy synthetic powder as China Patent No. CN185100331 invention disclosed, China Patent No. CN86107918 invention disclosed adopts the rare earth alloy method of dehydrogenating, and China Patent No. CN1030793 invention disclosed adopts winding-up CCl
4With Ar mixing dehydrogenation method.
The problem that the vacuum dehydrogenation method exists is, because the vacuum facility investment is big, it is with high costs to vacuumize, therefore steel grade will increase considerably product cost through the vacuum flow process, and, caused influence for the temperature control of molten steel and the continuity of technical process owing to there is not heating system during vacuum-treat.
The problem of spraying the chemical powder dehydriding is, because the prematurity still at present of winding-up chemical powder technology, and blowing powder can increase in the steel and be mingled with, thereby causes the reduction of molten steel cleanness.
Summary of the invention
The purpose of this invention is to provide a kind of top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace, can realize removing hydrogen in the steel, simplify the process for making flow process, save production cost, enhance productivity without the vacuum flow process.
For achieving the above object, solution of the present invention is:
A kind of top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace, it comprises the steps:
A) the original Graphite Electrodes of ladle refining furnace is replaced by hollow graphite electrode, is blown into gas from the hollow graphite electrode top, the bottom is by air permeation device bottom blowing Ar; The ladle refining furnace ladle enters heating station, falls electrode, according to the difference of steel grade, connects the bottom blowing pipeline, opens vent valve, carries out argon bottom-blowing and stirs, the normal metallurgy of beginning ladle refining furnace;
B) the normal smelting process of ladle refining furnace finishes, in the molten steel outer other compositions of dehydrogenation qualified substantially after, according to ladle refining furnace ladleful 100t～300t and smelt the difference of steel grade, control the flow≤10m of bottom-blown air brick well
3/ min and pressure 2MPa～10MPa open top blast air pipe valve top blast argon gas, gaseous tension 1.5MPa～10MPa, flow≤10m
3/ min and gassing time≤60min form good dehydrogenation condition in stove;
C) adopt top and bottom complex blowing 5～60min, promote electrode then, stop top-blown gas and bottom blown gas simultaneously, perhaps only stop top-blown gas, proceed the bottom blowing operation;
D) stop ladle refining furnace at last and all operate, ladle is sent into next station.
The present invention transforms ladle refining furnace (LF stove) electrode system, original solid Graphite Electrodes is replaced to hollow graphite electrode, hollow graphite electrode is connected with the top blast airing system, this top blast system combines with the original bottom blowing device of LF stove, be blown into gas simultaneously in the end by top in the LF stove, reach the purpose that removes hydrogen in the steel.
The aperture of hollow graphite electrode is 1/20 to 3/5 of an electrode diameter, at the LF stove between refining period, gas permeable brick and top hollow graphite electrode by ladle bottom are blown into gas simultaneously, the micro bubble that the gas that utilize the element generation chemical reaction in the hydrogen and plasma components in the steel, is blown into forms increases the effect of the forming core core of the interfacial area of dehydrogenation reaction and bubble hydrogen, thereby formed the thermodynamics and kinetics condition that helps dehydrogenation, the hydrogen in the steel has been removed.
Compared with prior art, the present invention has the following advantages:
1.LF furnace roof bottom combined blown dehydrogenation method does not need existing installation is carried out by a relatively large margin change, only needs the Graphite Electrodes processing of holing is installed additional one and overlapped top blast gas system, equipment can meet the demands.
2. under the situation that does not adopt the vacuum flow process, the present invention can make also that hydrogen richness drops to below the 2ppm in the steel, and the minimum 0.7ppm that reaches can substitute the dehydrogenation of vacuum flow process fully.
3.LF furnace roof bottom combined blown dehydrogenation method can be controlled temperature better than the vacuum outgas method, thereby matches with continuous casting process better.
Description of drawings
Fig. 1 is the structural representation of the ladle refining furnace of the present invention's use;
Nomenclature among the figure
1 AC power, 2 secondary high-current conductors, 3 electrode jaws
4 hollow graphite electrodes, 5 plasma arcs, 6 ladles lid
7 ladles, 8 slags, 9 molten steel
10 spirit pipelines, 11 buggy ladles, 12 bottom blowing porous plugs
13 hydrogen body source (a gases 1; B gas 2; Gas 3)
14 top-blown gas valve stations
(A reducing valve; The B stopping valve; The C under meter; The D flow control valve; The E repid cut-off valve)
15 mix gas bag 16 flowrate control valves 17 top-blown gas pipeline and coupling devices
18 material alloying devices
Embodiment
Referring to Fig. 1, it is depicted as the three-phase alternating current ladle refining furnace structural representation that the embodiment of the invention adopts, communication power supply 1 connects secondary high-current conductor 2 backs and is connected with electrode jaw 3, hollow graphite electrode 4 is controlled by electrode jaw 3, realize the lifting of hollow graphite electrode 4 and to its conduction, hollow graphite electrode 4 passes ladle lid 6 by the electrode hole of offering on the ladle lid 6 and enters in the ladle 7, the lifting realization by hollow graphite electrode 4 and the contact of slag 8 and molten steel 9 with separate.
Also be provided with material alloying device 18 on the ladle lid 6, splendid attire in the ladle 7 of slag 8 and molten steel 9 and is sitting on the buggy ladle 11, and bottom blowing pipeline 10 is connected with the bottom blowing porous plug 12 that is installed in ladle bottom bottom blown gas is blown in the molten steel 9 in the ladle 7.By gas pipe line with source of the gas 13, top-blown gas valve station 14, mix gas bag 15 and flowrate control valve 16 is connected in turn, flowrate control valve 16 is connected with hollow graphite electrode 4 by top-blown gas pipeline and connected unit 17 gas is blown in the plasma arc 5 of hollow graphite electrode end formation.
In when work, when the ladle 7 that fills molten steel is sitting on the buggy ladle 11, and mobile buggy ladle is under the heating location ladle.Connect communication power supply 1, decline hollow graphite electrode 4 and slag 8 and molten steel 9 short-circuit arcs, and with the gas of source of the gas 13 by top-blown gas valve station 14, mix gas bag 15, flowrate control valve 16, top-blown gas pipeline and connected unit 17 rapidly logical people's hollow Graphite Electrodess 4 and enter arc region, thereby produce plasma arc 5.The length of plasma arc, power (arc voltage, flame current) can be controlled by regulating transformer secondary voltage, gaseous tension, flow and rise fall of electrodes.In order to control between furnace atmosphere ladle lid and the ladle, can good seal between electrode hole and the electrode.
Embodiment 1
When adopting the inventive method to smelt Q195, after the 100tLF stove is in place, connect the bottom blowing pipeline, open vent valve, carry out bottom blowing Ar, bottom blowing flow 0.4m
3/ min, bottom blowing pressure 2MPa; Simultaneously after steel grade basal component reaches requirement, open the top blast air valve, fall the top hollow graphite electrode, the top blast pipeline pure Ar gas that begins to jet, flow 0.2m
3/ min, pressure 1.5MPa becomes 0.3m with the bottom blown gas flow simultaneously
3/ h, pressure keeps 2MPa; Behind winding-up 15min, stop top blast, promote electrode, change the bottom blowing flow into 0.35m this moment
3/ h, bottom blowing pressure are 2MPa, behind the continuation bottom blowing 6min, stop bottom blowing, enter next station.According to process sampling analysis result, after adopting top and bottom complex blowing 15min, hydrogen richness is reduced to 2.0ppm from the preceding 4.5ppm that jets.
Embodiment 2
Adopt the same flow process of embodiment 1, steel grade is Q345, and initial bottom blowing Ar flow is 0.3m
3/ min, pressure are 2.5MPa; During the beginning top and bottom complex blowing, top-blown gas flow 0.3m
3/ min, pressure 2MPa becomes 0.3m with the bottom blown gas flow simultaneously
3/ min, pressure keeps 2.5MPa; Behind winding-up 10min, stop top blast, promote electrode, change the bottom blowing flow into 0.4m this moment
3/ min, bottom blowing pressure are 2.5MPa, behind the continuation bottom blowing 6min, stop bottom blowing.According to process sampling analysis result, after adopting top and bottom complex blowing 10min, hydrogen richness is reduced to 1.4ppm from the preceding 3.8ppm that jets.
Embodiment 3
Adopt the same flow process of embodiment 1, steel grade is SPHC, and initial bottom blowing Ar flow is 0.25m
3/ min, pressure are 1.5MPa.During the beginning top and bottom complex blowing, top-blown gas flow 0.4m
3/ min, pressure 3MPa becomes 0.4m with the bottom blown gas flow simultaneously
3/ min, pressure 2MPa; Behind winding-up 12min, stop top blast, promote electrode, change the bottom blowing flow into 0.5m this moment
3/ min, bottom blowing pressure are 3MPa, behind the continuation bottom blowing 6min, stop bottom blowing.According to process sampling analysis result, after adopting top and bottom complex blowing 12min, hydrogen richness is reduced to 1.0ppm from the preceding 4.3ppm that jets.
Claims (2)
1. top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace, it comprises the steps:
A) the original Graphite Electrodes of ladle refining furnace is replaced by hollow graphite electrode, is blown into gas from the hollow graphite electrode top, the bottom is by air permeation device bottom blowing Ar; The ladle refining furnace ladle enters heating station, falls electrode, according to the difference of steel grade, connects the bottom blowing pipeline, opens vent valve, carries out argon bottom-blowing and stirs, the normal metallurgy of beginning ladle refining furnace;
B) the normal smelting process of ladle refining furnace finishes, in the molten steel outer other compositions of dehydrogenation qualified substantially after, according to ladle refining furnace ladleful 100t～300t and smelt the difference of steel grade, control the flow≤10m of bottom-blown air brick well
3/ min and pressure 2MPa～10MPa open top blast air pipe valve top blast argon gas, gaseous tension 1.5MPa～10MPa, flow≤10m
3/ min and gassing time≤60min form good dehydrogenation condition in stove;
C) adopt top and bottom complex blowing 5～60min, promote electrode then, stop top-blown gas and bottom blown gas simultaneously, perhaps only stop top-blown gas, proceed the bottom blowing operation;
D) stop ladle refining furnace at last and all operate, ladle is sent into next station.
2. top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace as claimed in claim 1 is characterized in that, the aperture of described hollow graphite electrode is 1/20 to 3/5 of an electrode diameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100474243A CN101418366B (en) | 2007-10-25 | 2007-10-25 | A method for re-blowing and dehydrogenating the top and bottom of a ladle refining furnace |
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| CN2007100474243A CN101418366B (en) | 2007-10-25 | 2007-10-25 | A method for re-blowing and dehydrogenating the top and bottom of a ladle refining furnace |
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| CN101418366A CN101418366A (en) | 2009-04-29 |
| CN101418366B true CN101418366B (en) | 2010-12-01 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560003A (en) * | 2012-01-29 | 2012-07-11 | 北京科技大学 | Method for preventing nitrogen increase of molten steel in LF (Ladle Furnace) refining process by top-blowing argon gas |
| CN102732677B (en) * | 2012-06-05 | 2014-01-22 | 河北钢铁股份有限公司 | Refining method for preventing carbureting of molten steel in LF (ladle furnace) through utilizing argon plasmas |
| CN103740892B (en) * | 2014-01-27 | 2015-07-15 | 山西太钢不锈钢股份有限公司 | Method for reducing nitrogen content of molten steel of austenitic stainless steel of ladle furnace |
| CN105969932B (en) * | 2016-06-30 | 2018-04-06 | 山东钢铁股份有限公司 | A kind of method for making steel control hydrogen |
| CN107586914A (en) * | 2017-08-30 | 2018-01-16 | 中冶南方工程技术有限公司 | BOTTOM ARGON BLOWING LF stoves and its auxiliary argon-blowing device, auxiliary argon jetting method |
| CN110106309A (en) * | 2019-04-02 | 2019-08-09 | 北京奥邦新材料有限公司 | A kind of bottomless electrode plasma ladle furnace of multiloop direct current |
| CN111504674A (en) * | 2020-04-10 | 2020-08-07 | 南京钢铁股份有限公司 | Method for evaluating vacuum dehydrogenation capacity of RH refining furnace |
| CN111551021A (en) * | 2020-05-25 | 2020-08-18 | 交城义望铁合金有限责任公司 | Top converting system for electric arc furnace |
| CN113512626A (en) * | 2021-04-23 | 2021-10-19 | 东北大学 | Ladle multipoint pulsation type bottom blowing intelligent refining device and method |
| CN113739581B (en) * | 2021-08-12 | 2022-09-30 | 昌黎县兴国精密机件有限公司 | Vehicle-mounted hydrogen supply method and equipment for hydrogen-rich smelting in blast furnace or shaft furnace |
| CN119824170A (en) * | 2025-03-17 | 2025-04-15 | 江苏省沙钢钢铁研究院有限公司 | Cord steel and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150117A (en) | 1980-04-21 | 1981-11-20 | Nippon Kokan Kk <Nkk> | Refining method of molten steel in vessel |
| JPS63171247A (en) | 1987-01-08 | 1988-07-15 | Aichi Steel Works Ltd | Ladle refining apparatus |
| JP2000096127A (en) * | 1998-09-22 | 2000-04-04 | Sumitomo Metal Ind Ltd | Molten steel dehydrogenation method |
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2007
- 2007-10-25 CN CN2007100474243A patent/CN101418366B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56150117A (en) | 1980-04-21 | 1981-11-20 | Nippon Kokan Kk <Nkk> | Refining method of molten steel in vessel |
| JPS63171247A (en) | 1987-01-08 | 1988-07-15 | Aichi Steel Works Ltd | Ladle refining apparatus |
| JP2000096127A (en) * | 1998-09-22 | 2000-04-04 | Sumitomo Metal Ind Ltd | Molten steel dehydrogenation method |
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| CN101418366A (en) | 2009-04-29 |
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