CN106319156B - RH refining device for improving decarburization effect and control method thereof - Google Patents
RH refining device for improving decarburization effect and control method thereof Download PDFInfo
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- CN106319156B CN106319156B CN201510332669.5A CN201510332669A CN106319156B CN 106319156 B CN106319156 B CN 106319156B CN 201510332669 A CN201510332669 A CN 201510332669A CN 106319156 B CN106319156 B CN 106319156B
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000007670 refining Methods 0.000 title claims abstract description 48
- 238000005261 decarburization Methods 0.000 title claims abstract description 38
- 230000000694 effects Effects 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 239000007789 gas Substances 0.000 claims abstract description 52
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 49
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000001301 oxygen Substances 0.000 claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 229910052786 argon Inorganic materials 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 11
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 229910001882 dioxygen Inorganic materials 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000011282 treatment Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
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- 238000002360 preparation method Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 3
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides an RH refining device for improving decarburization effect and a control method thereof, wherein the RH refining device comprises the following components: arranging an inclined table at the bottom end of the ascending pipe side of the vacuum chamber, wherein one side of the inclined table is connected with the side wall of the vacuum chamber, the inclined angle of the inclined table is 30-50 degrees, and the horizontal length D of the inclined table is 0.6-0.8 m; the upper end of the ascending pipe is arc-shaped, and the top of the ascending pipe is of a nozzle structure. The control method comprises the following steps: the steel liquid lifting gas of the ascending pipe is high-pressure nitrogen and oxygen or mixed gas of argon and oxygen; in the refining process, the pressure of the lifting gas is 0.7-1.4 Mpa, and the flow is 90-130 Nm3H; the pressure of the vacuum chamber is 60-5000 pa, and the pressure maintaining time is 5-16 min; simultaneously, the ladle bottom argon blowing operation is carried out, and the argon flow is 20-50 Nm3The pressure is 0.3-0.8 MPa. Increase the contact area of the molten steel and the vacuum chamber, promote the later decarburization rate, reduce the carbon content in the molten steel, and improve the cleanliness of the molten steel and the ultra-low carbonAnd favorable conditions are created for the development and production of high-added-value steel grades such as steel.
Description
Technical field
The invention belongs to refining art more particularly to the RH purifiers and control method of raising decarburization effect.
Background technology
As scientific and technical being constantly progressive and develop proposes increasingly higher demands to the clarity of steel, clean steel
Producing oneself becomes the mainstream of modern steel production, and it is steel-making worker institute facing challenges to improve molten steel clarity to the maximum extent
And the target that challenge and steel-making worker deliberately pursue.Ultra-low-carbon steel is the typical main body steel grade of clean steel, is full
The needs of sufficient contemporary automotive industry, the content of carbon and oxygen must be controlled in 10x10 in steel-4Below %.In numerous smelting ultralow-carbons
In the technology of steel, vacuum cycle (RH) refining, efficient since its is adaptable, effect is good, and refining operation is simple, facilitates
Series of advantages, it is most widely used, it is with fastest developing speed, it has also become a kind of outer SECONDARY REFINING IN A VACUUM CHAMBER of multifunctional furnace, in furnace outer refining technology
In occupy leading position.At present, countries in the world all for further develop technique and effort.China is no exception, saddle
Steel, military barium, Baosteel, climbing steel etc., this reconstructs, adds multi-functional RH purifiers for several years in succession.It is true with deep de- carbon functional RH
Empty refinery practice has become modern steel mill and smelts that high quality, that high-level steel grade especially produces ultra-low-carbon steel is essential
One of refining equipment.
According to the viewpoint of metallurgical reaction engineering, in metallurgical reaction system, transport phenomena and purifying reaction are always sent out simultaneously
Raw, mutual lotus root is closed.The quality of decarburization effect, not only the chemical reaction between gas phase (vacuum), molten steel and slag was related, but also by system
Flow regime, heat transfer, mass transfer and the other irreversible procedures of interior reactant are restricted.This means that except temperature, pressure, chemical group
Into outside the factors such as, structure and technical parameter, the transmission process occurred in system also will consumingly directly affect refining chemical reaction
Mechanism, rate and efficiency.
The decarbonizing process of RH is divided into decarbonization rate fast early period and decarbonization rate slow later stage.In decarburization early period, carbon oxygen
The supersaturated pressure of generation is steeped, based on the decarburization of molten steel inside, in the later stage, molten steel Free Surface decarburizing reaction becomes main de-
Carbon form, the free area of this stage increase molten steel are conducive to the promotion of decarbonization rate.At present, RH techniques are mainly by increase
Circular flow accelerates the decarbonization rate of early period, the later stage since the reduction decarbonization rate of carbon content inside molten steel declines, in order into
One step reduces the carbon content in molten steel, and it is main that increase processing time, which enables molten steel Free Surface fully to be contacted with gas phase (vacuum),
Want measure.From the point of view of the process of RH decarburizations, it is crucial for how increasing the decarburization effect in later stage.
Japanese scholars vegetarian rattan loyalty exists《Vacuum decarburization speed in RH degassers》The rate of RH decarburizations is carried out in one text
It discusses, it is believed that under the ability condition of existing equipment, it is to improve the major measure of decarbonization rate to increase molten steel reaction interface, is
This is employed blows Ar techniques on vacuum chamber liquid steel level, which is mounted with side-blown Ar dresses in the portion on the upper side of vacuum chamber side wall
It puts, increases molten steel reaction interface, good refining effect is achieved in refining treatment ultra-low-carbon steel.But due in this method
It is that Ar is blown using side wall to increase molten steel reaction interface, therefore the method is higher to the molten steel temperature requirement of refining treatment, this increasing
The burden of converter smelting is added, comprehensive analysis is unfavorable for economy smelting suprelow carbon steel.
《A kind of method of RH refining process Rapid deep decarburization》(201110177807.9) it discloses, starts 7- in RH decarburizations
After 10min, directly put into from tremie pipe and melted by oxygenation agent 80-94%, diffusant 5-15%, binding agent the 1-5% decarburization formed
Agent enters RH vacuum chambers, to control the carbon content in molten steel.The shortcoming of this method is the additional addition of decarburizer, is being risen
To also easily introducing other impurity while deep decarburization in molten steel, and lead to the pollution of molten steel, be unfavorable for the life of high-purity clean steel
Production.
《A kind of RH decarburization method during ultra-low-carbon steel production process by revolving furnace》(200910300094.3) disclosing will be super
Ladle slag chemical composition controls by weight percentage during mild steel RH carbonization treatments is：SiO25.0~11.0%,
CaO40.0~48.0%, Al2O37.5~15.0%, MgO 7.5~12.0%, FeO≤20.0%, MnO≤7.0%, remaining is
Fe2O3、CaF2And micro constitutent S, P, TiO2Deng.The precipitation of high-melting-point phase in ladle slag is inhibited, reduces the fusing point of ladle slag
And viscosity, the mobility of ladle slag is enhanced, alleviates RH insertion tube dry slags, improves RH decarburization effects.The deficiency of this method
Place is, although improving the mobility of ladle slag by the high oxidative ladle clinker that certain chemical composition is prepared, to alleviate RH and insert
Enter pipe dry slag, improve RH decarburization effects, but due to the CaF of supplying2Have sternly to Ladle Furnace Lining and RH lifting pipes and vacuum chamber with FeO
Its service life can be reduced with corrosion function by washing away again, increase comprehensive cost.Meanwhile the ladle slag of preparation is also easily in molten steel
Other impurity are introduced, and lead to the pollution of molten steel, are unfavorable for the production of high-purity clean steel.
《A kind of RH compound decarburizations method》(201310482607.3) RH decarburizations oxygen supply is disclosed solid oxygen to be taken to add blow height
Pressure oxygen is combined mode and carries out decarburization.Advantageous effect of the invention is to realize quick, steady, safely decarburization, for producing RH
Before decarburization carbon content of molten steel be distributed in 1000~2000ppm, finished product carbon below 350ppm low-carbon special steel.This method compared with
The method that preceding two parts of inventions provide has improvement, but is the limiting element of decarburization in the diffusion of decarburization latter stage mass transfer, and the method is more conventional
Method do not make the increase of its vacuum indoor molten steel interfacial area, especially latter stage is unfavorable for deep decarburization in processing procedure
It carries out.
《A kind of RH bottom blowing argon vacuum circulating degassers》(200910011359.8) open vacuum circulating degasser, packet
Ladle and vacuum chamber are included, wherein ladle bottom wall is equipped with nozzle or air brick, nozzle or air brick connection argon-blowing device, nozzle or saturating
Gas brick is located at vacuum chamber tedge in the side that ladle bottom wall projects.Device using the present invention can effectively improve RH vacuum and follow
The circular flow of ring degasser, conducive to the raising of decarbonization rate.It is disadvantageous in that, this method is single by Ladle Bottom
The air blowing in portion improves RH circular flows, and then improve decarbonization rate, this is effective, but in later stage carbon oxygen in RH processing early period
In the case that concentration is low, the function and effect of this method are with regard to very little.
From the point of view of above documents and materials and the disclosure respectively invented, improve RH refining effects and be mainly positioned against vacuum chamber
Side wall Argon is come the reaction interface that increases molten steel and by reasonably controlling slag composition, additionally adding oxygenation agent, promoted and recycle
Flow reaches raising refining effect.From the point of view of looking into news, there is presently no will be true by changing vacuum chamber structure
Molten steel, which carries out refinement, in empty room increases molten steel and the contact area of gas phase (vacuum) in RH refining process, so as to improve RH refining effects
The device of fruit.
For this purpose, the present invention, according to the characteristics of RH decarburizations, refinement increase can be carried out by molten steel in vacuum chamber by devising one kind
Molten steel and the contact area of gas phase (vacuum) in RH refining process, so as to improve the device of RH refining effects.
Invention content
A kind of RH purifiers for improving decarburization effect are provided it is an object of the invention to overcome the above problem and deficiency
And control method, under the premise of processing time is shortened, to improve the high added values steel grade such as molten steel cleanness and ultra-low-carbon steel
Exploitation and production create conditions.
A kind of RH purifiers for improving decarburization effect, including vacuum chamber, tedge, down-comer, control system, in vacuum
The bottom end setting sloping platform of room tedge side, sloping platform side connection vacuum chamber side wall, the sloping platform are connected one with vacuum chamber side wall
Side height is close to vacuum chamber center side height higher than the sloping platform, and sloping platform angle of inclination is 30-50 °；The tedge upper end
Camber is designed, and tedge top design is into 3-5 holes nozzle structure.
The sloping platform is connected the high H in side with vacuum chamber side wall1For 1.2m-2m, the sloping platform is close to vacuum chamber center one
The high H in side2For 0.6-1m, the sloping platform horizontal length D is 0.6-0.8m.
Spray orifice longitudinal section inside nozzle is quadrangle, wherein, the right is 60 ° -70 ° with following angle α, and the left side is under
The angle β on side is 70 ° -80 °, the following vertical range h of spray orifice upper edge apogee distance1For 0.06m-0.15m, spray orifice upper edge is most
Low spot is apart from following vertical range h2For 0.02m-0.05m.
A kind of control method for the RH purifiers for improving decarburization effect, which is characterized in that
(1) early-stage preparations
Baking preheating, each position baking temperature control of RH purifiers of the present invention are carried out to vacuum chamber, tedge and down-comer
System is at 1150~1200 DEG C；
(2) RH is refined
Step 1：
Steel ladle is raised to processing position using hydraulic lift in control system makes tedge (4) be inserted into molten steel,
Riser insertion depth is 500~600mm；
Step 2：
Vacuum pumping is carried out, uses high pressure nitrogen and oxygen mix ratio as (6~10):(4~0) or argon gas and oxygen
Mixed proportion is (6~10):Lift gas of the mixed gas of (4~0) as tedge (4) molten steel；
In refining process, lift gas pressure is controlled in 0.7~1.4Mpa, and flow control is in 90~130Nm3/h；Vacuum
In 60~5000pa ranges, the dwell time is 5~16min for the pressure control of room；Packet bottom blowing is carried out at the same time in refining process
Argon operates, and the low Argon position of ladle is corresponding with tedge position, and argon flow amount is 20~50Nm3/ h, pressure for 0.3~
0.8Mpa；
Step 3：
After ingredient meets smelting requirements, carry out vacuum chamber and break vacancy reason, it is using hydraulic lift that steel ladle is near low
Position makes tedge be completely disengaged with molten steel in packet and steel ladle is gone to received bit, completes RH refining treatments.
The step 3 or：In 1~5min of refining process, lift gas is nitrogen, oxygen gas mixture, mixing
Ratio is controlled (10:0) it is, pure nitrogen gas, lift gas pressure is controlled in 0.7~1.0Mpa, and flow control is in 90~100Nm3/
h；In 6~9min of refining process, lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (6~8:4~2) it, carries
It rises gas pressure to control in 1.0~1.2Mpa, flow control is in 100~110Nm3/h；In 10~15min of refining process,
Lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (8~10:2~0), the control of lift gas pressure 1.2~
1.4Mpa, flow control is in 110~130Nm3/h。
The beneficial effects of the present invention are：
(1) due to being provided with sloping platform in vacuum chamber, height is higher than vacuum chamber bottom base where making the squit hole of tedge
Quasi- face, after molten steel stream stock enters vacuum chamber, influenced by internal vacuum chamber molten steel it is small, enter after vacuum chamber conducive to molten steel crush it is thin
Change and reaction is promoted to carry out, it is simple for process, easily operated, without increasing any ancillary equipment；
(2) the top squit hole of tedge is divided into 5 holes, is disperseed lift gas, is conducive to lift gas to steel
The broken refinement of liquid makes the diffusion of gas in drop be easier to carry out, shortens RH processing times, improves the degassing effect of RH
Fruit；
(3) by being mixed into oxygen in lift gas, do not need to add additionally into molten steel oxygen blowing device make equipment simplified or
It is the bits for making elevated oxygen level, further improves the cleanliness factor of molten steel；
(4) by the supplying of oxygen in the sloping platform, the improvement on tedge top and the lift gas that are set in vacuum chamber, increase
The contact area of molten steel and vacuum chamber promotes the promotion of later stage decarbonization rate, can further reduce carbon content in molten steel, be
The exploitation and production for improving the high added values steel grade such as molten steel cleanness and ultra-low-carbon steel create favorable conditions.
Description of the drawings
Fig. 1 is the profilograph of RH purifiers.
Fig. 2 is the vertical view of RH purifiers.
Fig. 3 is the profilograph of single spray orifice at the top of tedge.
1 is vacuum chamber in figure, and 2 be sloping platform, and 4 be tedge, and 5 be spray orifice, and 7 be molten steel, and 8 be down-comer, and a is right for quadrangle
Side, b is following for quadrangle, and c is the quadrangle left side, and d is quadrangle top.
Specific embodiment
By embodiment, the present invention is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, 3, a kind of RH purifiers for improving decarburization effect, including vacuum chamber 1, tedge 4, down-comer
8th, control system, sloping platform 2 is set in the bottom end of 1 tedge of vacuum chamber, 4 side, and 2 side of sloping platform connection, 1 side wall of vacuum chamber is described oblique
The side height that is connected with 1 side wall of vacuum chamber of platform 2 is close to 1 center side height of vacuum chamber higher than the sloping platform 2, and sloping platform 2 tilts
Angle is 30-50 °；Camber is designed in 4 upper end of tedge, and 4 top design of tedge is into 3-5 holes nozzle structure.
The sloping platform 2 is connected the high H in side with 1 side wall of vacuum chamber1For 1.2m-2m, the sloping platform 2 is close in vacuum chamber 1
The high H in heart side2For 0.6-1m, the 2 horizontal length D of sloping platform is 0.6-0.8m.
5 longitudinal section of spray orifice inside the nozzle is quadrangle, wherein, the angle α of the right a and following d is 60 ° -70 °,
The angle β of left side c and following d is 70 ° -80 °, the vertical range h of the following d of spray orifice upper edge apogee distance1For 0.06m-
0.15m, the vertical range h of the following d of spray orifice upper edge perigee distance2For 0.02m-0.05m.
A kind of control method for the RH purifiers for improving decarburization effect：
(1) early-stage preparations
Baking preheating, each position baking temperature of RH purifiers of the present invention are carried out to vacuum chamber 1, tedge 4 and down-comer 8
Control is at 1150~1200 DEG C；
(2) RH is refined
Step 1：
Steel ladle is raised to processing position using hydraulic lift in control system makes tedge be inserted into molten steel 7, carries
Riser insertion depth is 500~600mm；
Step 2：
Vacuum pumping is carried out, uses high pressure nitrogen and oxygen mix ratio as (6~10):(4~0) or argon gas and oxygen
Mixed proportion is (6~10):Lift gas of the mixed gas of (4~0) as 4 molten steel 7 of tedge；
In refining process, lift gas pressure is controlled in 0.7~1.4Mpa, and flow control is in 90~130Nm3/h；Vacuum
In 60~5000pa ranges, the dwell time is 5~16min for the pressure control of room；Packet bottom blowing is carried out at the same time in refining process
Argon operates, and the low Argon position of ladle is corresponding with 4 position of tedge, and argon flow amount is 20~50Nm3/ h, pressure for 0.3~
0.8Mpa；
Step 4：After ingredient meets smelting requirements, carry out vacuum chamber and break vacancy reason, filled using hydraulic lifting in control system
It puts the near low level of steel ladle, tedge 4 is made to be completely disengaged with molten steel 7 in packet and steel ladle is gone into received bit, completes RH essences
Refining is handled.
Wherein step 3 may be：In 1~5min of refining process, lift gas is nitrogen, oxygen gas mixture, mixing
Ratio is controlled (10:0) it is, pure nitrogen gas, lift gas pressure is controlled in 0.7~1.0Mpa, and flow control is in 90~100Nm3/
h；In 6~9min of refining process, lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (6~8:4~2) it, carries
It rises gas pressure to control in 1.0~1.2Mpa, flow control is in 100~110Nm3/h；In 10~15min of refining process,
Lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (8~10:2~0), the control of lift gas pressure 1.2~
1.4Mpa, flow control is in 110~130Nm3/h。
Embodiment 1：
It is handled using apparatus of the present invention and desired steel grade is not done to nitrogen content, according to each step operation in technical solution,
When carrying out vacuum pumping again, in 1~5min of refining process, lift gas pressure can be controlled in 0.7Mpa, flow control
In 95Nm3/ h, nitrogen, the control of carrier of oxygen mixed proportion are 10:0, as pure nitrogen gas；In 6~9min of refining process, gas will be promoted
Body pressure is controlled in 1.0Mpa, and flow control is in 100Nm3/ h, nitrogen, the control of carrier of oxygen mixed proportion are 8:2；In refining process 10
In~15min, lift gas pressure is controlled in 1.2Mpa, flow control is in 115Nm3/ h, nitrogen, the control of carrier of oxygen mixed proportion
9:1, during pressurize vacuum degree in vacuum chamber control disclosure satisfy that processing carbon content in the ultra-low-carbon steel life less than 50ppm in 300pa
Production requirement.
Embodiment 2：
It is handled using apparatus of the present invention and desired steel grade is not done to nitrogen content, according to each step operation in technical solution,
When carrying out vacuum pumping, in 1~5min of refining process, lift gas pressure can be controlled in 0.8Mpa, flow control
System is in 100Nm3/ h, nitrogen, the control of carrier of oxygen mixed proportion are 10:0, as pure nitrogen gas；It, will in 6~9min of refining process
Lift gas pressure is controlled in 1.1Mpa, and flow control is in 110Nm3/ h, nitrogen, the control of carrier of oxygen mixed proportion are 7:3；It is refining
In 10~15min of process, lift gas pressure is controlled in 1.3Mpa, flow control is in 120Nm3/ h, nitrogen, carrier of oxygen mixing
Ratio is controlled 9:1, during pressurize vacuum degree in vacuum chamber control disclosure satisfy that processing carbon content is ultralow less than 20ppm in 100pa
Carbon steel production requirement.
Embodiment 3：
It is less than the steel grade of 40ppm using apparatus of the present invention processing requirement nitrogen content, is grasped according to each step in technical solution
Make, when carrying out vacuum pumping, in 1~5min of refining process, lift gas pressure is controlled in 0.8Mpa, flow control
System is in 100Nm3/ h, argon, the control of carrier of oxygen mixed proportion are 10:0, as pure argon；It, will in 6~9min of refining process
Lift gas pressure is controlled in 1.1Mpa, and flow control is in 110Nm3/ h, argon, the control of carrier of oxygen mixed proportion are 7:3；It is refining
In 10~15min of process, lift gas pressure is controlled in 1.3Mpa, flow control is in 120Nm3/ h, argon, carrier of oxygen mixing
Ratio is controlled 9:1, during pressurize vacuum degree in vacuum chamber control disclosure satisfy that processing carbon content is ultralow less than 20ppm in 100pa
Carbon steel production requirement.
Claims (5)
1. a kind of RH purifiers for improving decarburization effect, including vacuum chamber (1), tedge (4), down-comer (8), control system
System, which is characterized in that in the bottom end of vacuum chamber (1) tedge (4) side setting sloping platform (2), sloping platform (2) side connection vacuum chamber
(1) side wall, the sloping platform (2) the side height that is connected with vacuum chamber (1) side wall are close to vacuum chamber (1) higher than the sloping platform (2)
Center side height, sloping platform (2) angle of inclination are 30-50 °；Design camber, and tedge (4) in tedge (4) upper end
Top design is into 3-5 holes nozzle structure.
2. the RH purifiers of decarburization effect are improved according to claim 1, which is characterized in that the sloping platform (2) and vacuum
Room (1) side wall is connected the high H in side1For 1.2m-2m, the sloping platform (2) is close to vacuum chamber (1) high H in center side2For 0.6-1m,
Sloping platform (2) the horizontal length D is 0.6-0.8m.
3. the RH purifiers according to claim 1 or claim 2 for improving decarburization effect, which is characterized in that inside the nozzle
Spray orifice (5) longitudinal section is quadrangle, wherein, the angle α of the right (a) and following (d) are 60 ° -70 °, the left side (c) and following (d)
Angle β for 70 ° -80 °, the vertical range h of spray orifice upper edge apogee distance following (d)1For 0.06m-0.15m, spray orifice upper edge
The vertical range h of perigee distance following (d)2For 0.02m-0.05m.
4. a kind of control method of claims 1 or 2 or the 3 RH purifiers for improving decarburization effect, which is characterized in that
(1) early-stage preparations
Carry out baking preheating to vacuum chamber, tedge and down-comer, each position baking temperature control of RH purifiers 1150~
1200℃；
(2) RH is refined
Step 1：
Steel ladle is raised to processing position using hydraulic lift in control system makes tedge (4) be inserted into molten steel, rises
Pipe (4) insertion depth is 500~600mm；
Step 2：
Vacuum pumping is carried out, uses high pressure nitrogen and oxygen mix ratio as (6~10):(4~0) or argon gas and oxygen mix
Ratio is (6~10):Lift gas of the mixed gas of (4~0) as tedge (4) molten steel；
In refining process, lift gas pressure is controlled in 0.7~1.4Mpa, and flow control is in 90~130Nm3/h；The pressure of vacuum chamber
In 60~5000pa ranges, the dwell time is 5~16min for power control；The operation of packet BOTTOM ARGON BLOWING is carried out at the same time in refining process,
The low Argon position of ladle is corresponding with tedge position, and argon flow amount is 20~50Nm3/ h, pressure are 0.3~0.8Mpa；
Step 3：
After ingredient meets smelting requirements, carry out vacuum chamber and break vacancy reason, steel ladle is down to low level using hydraulic lift, is made
Tedge (4) completely disengages with molten steel (7) in packet and steel ladle is gone to received bit, completes RH refining treatments.
5. the control method of the RH purifiers of decarburization effect is improved according to claim 4, which is characterized in that the step
3：In 1~5min of refining process, lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (10:0), it is purity nitrogen
Gas, lift gas pressure are controlled in 0.7~1.0Mpa, and flow control is in 90~100Nm3/h；In 6~9min of refining process
Interior, lift gas is nitrogen, oxygen gas mixture, and mixed proportion is controlled (6~8:4~2), the control of lift gas pressure 1.0~
1.2Mpa, flow control is in 100~110Nm3/h；In 10~15min of refining process, lift gas is nitrogen, oxygen gas mixture
Body, mixed proportion are controlled (8~10:2~0), the control of lift gas pressure is in 1.2~1.4Mpa, flow control 110~
130Nm3/h。
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| CN109852766B (en) * | 2018-12-05 | 2020-11-03 | 敬业钢铁有限公司 | Hydrogen and oxygen control process for RH furnace refining |
| CN112609043A (en) * | 2020-12-11 | 2021-04-06 | 北京首钢股份有限公司 | Rapid oxygenation and decarbonization method in RH refining process |
| CN113388717B (en) * | 2021-03-30 | 2022-08-23 | 北京首钢股份有限公司 | High-efficiency RH decarburization method |
| 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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| CN103834766A (en) * | 2014-03-12 | 2014-06-04 | 东北大学 | Dip pipe for RH vacuum refining device |
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| JPH01132715A (en) * | 1987-11-19 | 1989-05-25 | Kawasaki Steel Corp | Method for blowing inert gas in rh type degassing apparatus |
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|---|---|---|---|---|
| CN101063179A (en) * | 2006-04-28 | 2007-10-31 | 金弘熙 | Method for prolonging retention period of molten steel in RH vacuum groove |
| CN101441187A (en) * | 2008-12-22 | 2009-05-27 | 辽宁科技学院 | RH vacuum refining top gun powder spraying test device and method |
| CN201334498Y (en) * | 2008-12-22 | 2009-10-28 | 辽宁科技学院 | RH vacuum refining top lance powder spraying device |
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