CN101418366A - Top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace - Google Patents
Top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace Download PDFInfo
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- CN101418366A CN101418366A CNA2007100474243A CN200710047424A CN101418366A CN 101418366 A CN101418366 A CN 101418366A CN A2007100474243 A CNA2007100474243 A CN A2007100474243A CN 200710047424 A CN200710047424 A CN 200710047424A CN 101418366 A CN101418366 A CN 101418366A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000006356 dehydrogenation reaction Methods 0.000 title claims abstract description 25
- 238000003723 Smelting Methods 0.000 title claims abstract description 10
- 238000009847 ladle furnace Methods 0.000 title claims description 6
- 238000007664 blowing Methods 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000007670 refining Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052786 argon Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 239000011449 brick Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- 229910002804 graphite Inorganic materials 0.000 claims description 23
- 239000010439 graphite Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 5
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 238000005272 metallurgy Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 abstract description 17
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 206010036590 Premature baby Diseases 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Abstract
The invention discloses a method for dehydrogenation through top bottom combined blowing of a ladle refining furnace, which comprises the following steps: a) a ladle of the ladle refining furnace enters a heating work position, an electrode is decreased, and a bottom blowing pipeline and a vent valve are turned on so as to carry out bottom blowing argon gas stirring and normal smelting; b) after the smelting operation is completed and other components except hydrogen are basically qualified, the flow of a bottom blowing gas permeable brick is controlled less than or equal to 10m<3>/min, the pressure is controlled from 0.01 to 10MPa, a top blowing gas pipeline valve is opened to blow the argon gas at the top, the gas pressure is from 0.01 to 10MPa, the flow is less than or equal to 10m<3>/min, the time is less than or equal to 60min, and therefore good dehydrogenation conditions are formed in the furnace; c) the top bottom combined blowing is carried out for 5 to 60min, the electrode is increased, and simultaneously the top bottom combined blowing is stopped, or only the top blowing is stopped while the bottom blowing goes on; and d) all operations are stopped so as to enter the next work position. The method can realize the removal of hydrogen in the steel without a vacuum process, simplify the steelmaking process flow, save the production cost, and improve the 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 CC1
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, bottom air permeation device bottom blowing Ar from the hollow graphite electrode top; 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 the concise stove ladleful of ladle vary in size be 0.05t～300t and smelt the difference of steel grade, control the flow≤10m of bottom-blown air brick well
3/ min and pressure 0.01MPa～10MPa open top blast air pipe valve top blast argon gas, gaseous tension 0.01MPa～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.
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.
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, air permeation device bottom blowing Ar is crossed in the bottom; 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 the ladle refining furnace ladleful vary in size (0.05t～300t) and smelt the difference of steel grade, control the flow≤10m of bottom-blown air brick well
3/ min and pressure 0.01MPa～10MPa open top blast air pipe valve top blast argon gas, gaseous tension 0.01MPa～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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100474243A CN101418366B (en) | 2007-10-25 | 2007-10-25 | Top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100474243A CN101418366B (en) | 2007-10-25 | 2007-10-25 | Top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101418366A true CN101418366A (en) | 2009-04-29 |
| CN101418366B CN101418366B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (9)
| 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 |
| CN102732677A (en) * | 2012-06-05 | 2012-10-17 | 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 |
| CN103740892A (en) * | 2014-01-27 | 2014-04-23 | 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 |
| CN105969932A (en) * | 2016-06-30 | 2016-09-28 | 山东钢铁股份有限公司 | Steelmaking hydrogen control method |
| 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 |
| CN113512626A (en) * | 2021-04-23 | 2021-10-19 | 东北大学 | Ladle multipoint pulsation type bottom blowing intelligent refining device and method |
| CN113739581A (en) * | 2021-08-12 | 2021-12-03 | 昌黎县兴国精密机件有限公司 | Vehicle-mounted hydrogen supply method and equipment for blast furnace or shaft furnace hydrogen-rich smelting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000096127A (en) * | 1998-09-22 | 2000-04-04 | Sumitomo Metal Ind Ltd | Method for dehydrogenizing molten steel |
-
2007
- 2007-10-25 CN CN2007100474243A patent/CN101418366B/en active Active
Cited By (10)
| 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 |
| CN102732677A (en) * | 2012-06-05 | 2012-10-17 | 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 |
| CN103740892A (en) * | 2014-01-27 | 2014-04-23 | 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 |
| CN105969932A (en) * | 2016-06-30 | 2016-09-28 | 山东钢铁股份有限公司 | Steelmaking hydrogen control method |
| 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 |
| CN113512626A (en) * | 2021-04-23 | 2021-10-19 | 东北大学 | Ladle multipoint pulsation type bottom blowing intelligent refining device and method |
| CN113739581A (en) * | 2021-08-12 | 2021-12-03 | 昌黎县兴国精密机件有限公司 | Vehicle-mounted hydrogen supply method and equipment for blast furnace or shaft furnace hydrogen-rich smelting |
| 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 blast furnace or shaft furnace hydrogen-rich smelting |
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| Publication number | Publication date |
|---|---|
| CN101418366B (en) | 2010-12-01 |
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