CN109759575A - A kind of annular air curtain barricade wall and its Argon metallurgical method for ladle - Google Patents
A kind of annular air curtain barricade wall and its Argon metallurgical method for ladle Download PDFInfo
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- CN109759575A CN109759575A CN201910126674.9A CN201910126674A CN109759575A CN 109759575 A CN109759575 A CN 109759575A CN 201910126674 A CN201910126674 A CN 201910126674A CN 109759575 A CN109759575 A CN 109759575A
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- ladle
- air curtain
- argon
- annular air
- curtain barricade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The present invention relates to a kind of annular air curtain barricade walls for ladle, including annular air curtain barricade wall ontology (1), disperse formula breathes freely ring (2), gas chamber (3), air inlet pipe (4), it is provided with disperse formula in annular air curtain barricade wall ontology (1) and breathes freely ring (2), the upper surface of annular air curtain barricade wall ontology (1) is stretched out on the top of the ventilative ring of disperse formula, gas chamber (3) is by burying loose tool one-pass molding in the bottom of the ventilative ring of disperse formula, the side of gas chamber (3) is connected with air inlet pipe (4), one end of air inlet pipe is connected to gas chamber, the other end is stretched out from the side of air curtain barricade wall ontology (1), it is characterized in that, in Con casting ladle casting process, ladle dispersion ring ventilating filling pipe end brick cup whole process Argon, with purification molten steel ladle, inhibit two Argon metallurgical functions of steel ladle pouring slag.
Description
Technical field
The present invention relates to a kind of annular air curtain barricade walls and its Argon metallurgical method for ladle, belong to Ferrous Metallurgy ladle
Argon metallurgical technology technical field.
Background technique
In order to improve Cleanliness of Molten Steel and castability, fine steel grade is developed, iron and steel enterprise will be using not after steel-making
Same furnace outer refining process is further processed molten steel.It is different to smelt steel grade, the time of external refining, there is also differences, generally
The refining treatment time of high-quality steel all at 40 minutes or more, wherein the ladle refining later period generally carry out " soft blow " operation, i.e., with
Certain small tolerance carries out molten bath weak stirring 8 minutes or more, and to promote inclusion floating, removal, after " soft blow ", molten steel is also
It needs to lift continuous casting revolving platform by 5-10 minutes " standing " time and be poured.But in actual production exist with
Lower problem or deficiency: refining time is long, and furnace machine is caused to mismatch, and becomes the restricted link for influencing steel-making production capacity；It is domestic many
Iron and steel corporation not can guarantee enough " soft blow " and " standing " time, due to the requirement of rhythm of production so as to cause molten steel
In field trash be unable to get and effectively remove, cause slab quality defect.
Chinese patent literature CN201070669Y (patent No.: 200720151456.3) discloses a kind of air curtain barricade wall, has
Wall made of gas permeable material；The wall is connected with air-feed source, it is characterised in that: the wall is annular, respectively ring
It is wound on around each mouth of a river of tundish and is arranged, the wall is by forming connecting hole and air-feed source phase on it
Even.Its solution for capableing of economy is to the complete air purge of the molten steel of injection.The deficiency of the patented technology: wall is all by a kind of ventilative material
Material preparation, bulk density is small, and intensity is low, not anti-erosion, wash away, service life is low, it is difficult to be used for mass industrialized production.
Chinese patent literature CN104028739B (patent No.: 201410274221.8) discloses water on a kind of ladle ventilating
Mouth brick cup and its method for controlling ladle roughing slag, including filling pipe end brick cup ontology, permeable-gas ceramics stick, gas chamber box, air inlet pipe, upper water
The middle part of mouth brick cup ontology is provided with steel outlet hole, filling pipe end mounting hole from top to bottom, is provided with annulus in filling pipe end brick cup ontology
The gas chamber box of permeable-gas ceramics stick and annular that shape is evenly arranged, the bottom of gas chamber box is connected with air inlet pipe, at molten steel ladle
When low liquid level, it is blown into argon gas since air inlet pipe, controls ladle upper nozzle eddy generation slag problem.The patent mainly for
Steel ladle pouring latter stage inhibits ladle nozzle slag problem.The patent has the disadvantage that the argon gas that argon gas is formed through ventilative pottery
Bubble is big, closeness is small, and is only blown into argon gas in steel ladle pouring latter stage, without the metallurgical function of whole Argon removal of inclusions.
Chinese patent literature CN104525929A (patent No.: 201410805369) discloses a kind of ladle bottom ring tapping hole
The method that Argon controls ladle roughing slag is that the air brick that width is 50~300mm is arranged around ladle bottom tapping hole, works as steel
When pouring molten steel liquid level is 150~400mm in wrapping, argon gas is blown into ladle through annular gas permeable brick.The patent is main
Inhibit ladle nozzle slag problem for steel ladle pouring latter stage.The patent has the disadvantage that not to the structure of annular gas permeable brick
It is described in detail, and is only blown into argon gas in steel ladle pouring latter stage, without the metallurgy of whole Argon and promotion inclusion floating, removal
Function.
Chinese patent literature CN107225231A (patent No. 201710575311.4) discloses a kind of continuous casting production ring
Shape air curtain barricade wall, including air curtain barricade wall ontology (1), disperse formula ventilative ring (2), gas chamber (3), air inlet pipe (4), air curtain barricade wall ontology
In circular ring shape, the middle part is provided with cylindrical mounting hole, the ventilative ring of disperse formula of annular is provided in air curtain barricade wall ontology (1)
(2), the upper surface of air curtain barricade wall ontology (1) is stretched out on the top of the ventilative ring of disperse formula, and gas chamber (3) takes shape in the ventilative ring of disperse formula
Bottom, the side of gas chamber are connected with air inlet pipe (4), and one end of air inlet pipe is connected to gas chamber, and the other end is from air curtain barricade wall ontology
Side is stretched out, and air inlet pipe connects metal tube (8) and is connected to external argon gas gas source, is blown into argon gas, the shape around filling pipe end brick cup
Circlewise air curtain barrier improves inclusion removal rate to the molten steel whole air purge that will enter tundish upper nozzle.The patent
Mainly for the inclusion removal of molten steel in continuous casting production.The deficiency of the patented technology: the ventilative ring of disperse formula is pressed into using machine
Type, uniformity of breathing freely is poor, influences Argon metallurgical effect, bulk density is small, influences service life.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of annular air curtain barricade wall for ladle and its Argon metallurgy side
Method is set on ladle upper nozzle brick cup, and the present invention passes through the ventilative ring of setting disperse formula in annular air curtain barricade wall ontology, in continuous casting
During steel ladle pouring, whole process is blown into argon gas, and according to the variation in molten steel net weight in ladle (molten steel ladle face), adjust automatically
Argon flow, argon gas form small Argon Bubble through the ventilative ring of disperse formula, and cyclic annular air curtain barrier is formed around ladle upper nozzle,
Air purge is carried out to the molten steel that will enter ladle upper nozzle, promotes inclusion floating and removal, and in the steel ladle pouring later period, effectively
Ladle roughing slag caused by inhibiting conflux vortex and drainage are heavy to cheat, at the same solve molten steel ladle face persistently reduce under conditions of,
Because argon blowing rate adjustment not in time, blow brokenly steel slag face initiation molten steel slag problem, using the present invention than Comparison study example
(patent No.: 200720151456.3) molten steel in ladle pours surplus and reduces 17% or more on year-on-year basis CN201070669Y, continuous casting billet
Sample electrolysis field trash weight reduces 23% or more on year-on-year basis.
A kind of annular air curtain barricade wall for ladle, including annular air curtain barricade wall ontology (1), disperse formula ventilative ring (2), gas
Room (3), air inlet pipe (4), the cross section of annular air curtain barricade wall ontology (1) are in circular ring shape, the middle part of annular air curtain barricade wall ontology (1)
It is provided with mounting hole (5), disperse formula is provided in annular air curtain barricade wall ontology (1) and is breathed freely ring (2), the top of the ventilative ring of disperse formula
The upper surface of annular air curtain barricade wall ontology (1) is stretched out, gas chamber (3) is set to the bottom of the ventilative ring of disperse formula, the side of gas chamber (3)
Air inlet pipe (4) are connected with, one end of air inlet pipe is connected to gas chamber, and the other end is stretched out from the side of air curtain barricade wall ontology (1).Even
In cast steel packet casting process, ladle dispersion ring ventilating filling pipe end brick cup whole process Argon has purification molten steel ladle, inhibits ladle
It is poured two Argon metallurgical functions of slag.
Preferably, gas chamber (3) is by burying loose tool one-pass molding in the bottom of the ventilative ring of disperse formula.
Disperse formula of the present invention breathe freely ring (2) with high-purity corundum, mullite etc. for main material, using isostatic pressing,
The production of medium temperature firing process, bulk density >=2.80g/cm3, air hole in dispersion ring uniformly, Dispersed precipitate, argon gas is through more
It dissipates the ventilative ring of formula and forms continuous, equally distributed small Argon Bubble (the diameter < 1mm of hydraulic model trial measurement bubble), better than China
A kind of patent document CN201070669Y (patent No.: 200720151456.3) described by wall prepared by gas permeable material, volume
Density is small, intensity is low, the low technical problem of service life, is better than the Chinese patent literature CN107225231A (patent No.
201710575311.4) the ventilative ring of the corundum disperse formula of mechanical pressing production, the disperse formula for solving mechanical pressing production are saturating
The mass defects such as compression ring gas permeability is irregular, bulk density is small, better than Chinese patent literature CN104028739B (patent No.:
201410274221.8) it is big, close to solve the argon gas bulb diameter that argon gas is formed through permeable-gas ceramics stick for the permeable-gas ceramics stick described in
The performances such as intensity is small are insufficient, using the present invention than the Comparison study example CN104028739B (patent No.: 201410274221.8) steel
Surplus of molten steel in packet pouring reduces 7% or more on year-on-year basis, and continuous casting billet sample electrolysis field trash weight reduces 33% or more on year-on-year basis.
The isostatic pressing process is that sample to be pressed is placed in high-pressure bottle, incompressible using liquid medium
Property and the property for uniformly transferring pressure carry out uniform pressurization to sample from all directions, when liquid medium is injected by pressure pump
When pressure vessel, according to fluid mechanics principle, pressure size is constant and is delivered evenly to all directions.High-pressure bottle at this time
In the pressure that is subject in all directions of powder be uniform and of the same size.Lean property powder is formed by the above method
The method of dense green is known as isostatic pressing method.Isostatic pressing process of the present invention uses the prior art.
Currently preferred, the height H of the annular air curtain barricade wall ontology (1) is 150~250mm.
It is currently preferred, the annular air curtain barricade wall ontology (1), corundum castable moulding by casting, bulk density >=
3.0g/cm3, high temperature break resistant intensity >=12Mpa, crushing strength under high temperature >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=
2%.
Currently preferred, the disperse formula is breathed freely ring (2), and cross section is in a rectangular trapezoid in circular ring shape, vertical section, circle
Ring lower width x is 55~65mm, and upper width y is 50~60mm, and height h is 100~200mm.
Currently preferred, mounting hole (5) in the middle part of the ventilative ring of the disperse formula, cross section is rounded, and diameter of a circle is big
Diameter matching design that is small and being set in ladle upper nozzle brick cup (7), and lower part circular diameter D2 is bigger by 2 than top circular diameter D1
~3mm, convenient for demoulding.
Currently preferred, table on the annular air curtain barricade wall ontology (1) is stretched out in the upper end of the disperse formula ventilative ring (2)
The height z in face is 5~10mm.
It is currently preferred, lower end and annular air curtain barricade wall ontology (1) side wall of ventilative ring (2) side wall of the disperse formula
Distance a is 20~30mm.
Currently preferred, the gas chamber (3) generally circular ring shape, the vertical section of gas chamber is semicircle, and radius R is 10
Air inlet pipe mounting hole (6) are arranged on gas chamber (3) in~11mm, and the diameter d of air inlet pipe mounting hole is 12~13mm.Preferably, air inlet
The diameter d of pipe mounting hole is 12mm.
Air inlet pipe (4) of the present invention, air inlet connection metal tube (9) material are heat-resistance stainless steel round tube, specification
For ￠ 12 × 1.3 (outer diameter 12mm, wall thickness 1.3mm).
Disperse formula ventilative ring of the present invention for the annular air curtain barricade wall of ladle, is produced using isostatic pressing process, under
Portion width x is 55~65mm, and upper width y is 50~60mm, and height h is 100~200mm, and the upper end of the ventilative ring of disperse formula is stretched
The height z of described annular air curtain barricade wall ontology (1) upper surface is the design such as 5~10mm out, is based on task of the invention: improving
The ventilative uniformity and Argon Bubble closeness of the ventilative ring of disperse formula, improve the ability of Argon Bubble capture, removal of inclusions, inhibit to converge
Ladle roughing slag caused by flowing that vortex and drainage are heavy and cheating, ring of breathing freely convenient for disperse formula accurate positioning, realize disperse formula breathe freely ring with
Bulk lifetime is synchronous and regioselective, is that those skilled in the art touches by the research of a large amount of hydraulic model trial and pilot production
What rope obtained, wherein disperse formula breathes freely ring using isostatic pressing process production, solves the disperse of existing mechanical pressing production
The mass defects such as ring gas permeability is irregular, bulk density is small that formula is ventilative so that argon gas through disperse formula breathe freely ring formed it is continuous, close
The big small Argon Bubble of intensity, Argon Bubble all move upwards, and cyclic annular air curtain barrier is formed around ladle upper nozzle, to will
Molten steel into ladle upper nozzle carries out air purge, promotes inclusion floating and removal, and in the steel ladle pouring later period, effectively inhibits to converge
Ladle roughing slag caused by vortex and the heavy hole of drainage is flowed, not only increases the cleanliness of molten steel, and reduce molten steel in ladle and pour
Surplus；The width design of the ventilative ring of disperse formula is breathed freely according to different in width the inclusion removal effect of ring and facing for generation vortex
Hydraulic model trial result of study, the located space size of boundary's height require and Forming Quality requires comprehensive study setting, disperse formula
The height design of ventilative ring is the erosion based on ladle offline light maintenance measurement ladle upper nozzle brick cup ontology and the ventilative ring of disperse formula
It is residual thickness size and set, with guarantee disperse formula breathe freely ring and ladle upper nozzle brick cup ontology, ladle slag line working lining use
Service life is synchronous；The ladle upper nozzle brick cup body upper surface design is stretched out in the upper end of the ventilative ring of disperse formula, solves ladle more
Dissipate the positioning problem of the ventilative ring of disperse formula in the ventilative ring ventilating filling pipe end brick cup casting production of formula.
The installation method of annular air curtain barricade wall of the present invention for ladle installs ladle upper nozzle using the prior art
Brick cup (7) smears the corundum chamotte of 10~15mm thickness on ladle upper nozzle brick cup (7) outer wall, and ladle annular air curtain is kept off
The mounting hole (5) of wall is set in outer wall (7) top of ladle upper nozzle brick cup, so that ladle annular air curtain barricade wall ontology (1)
Upper surface is concordant with the working face of bottom of steel ladle working lining (12), then air inlet is connected to the one end and air inlet pipe (4) of metal tube (8)
Connection, the other end are pierced by from the packet bottom of ladle involucrum (9), are then pacified ladle upper nozzle brick cup using ladle working lining castable
Dress melt pit (10) casting is filled and led up, and the installation of ladle annular air curtain barricade wall is so far completed, to when ladle seat to the big Bao Huizhuan of conticaster
After platform, air inlet connection metal tube (8) is connected to argon gas gas source.
The ladle working lining castable is the corundum-spinel castable of prior art production.
The present invention also provides a kind of Argon metallurgical plants of annular air curtain barricade wall using above-mentioned ladle, which is characterized in that
A set of argon gas pipe-line system and electric control system are set in argon flow control, introduce molten steel weighing signal in ladle, root
According to the variation of molten steel net weight in ladle, Serial regulation argon flow, solve under conditions of liquid steel level persistently reduces in ladle,
Because argon blowing rate adjustment not in time, blow brokenly the molten steel top of the slag initiation molten steel slag problem.
The argon gas pipe-line system, as shown in fig. 6, being divided into master blows branch and manual bypass, wherein the main branch that blows includes the
One ball valve 14a, pneumatic filter 15, first pressure gauge 16a, the second ball valve 14b, pressure transmitter 17, solenoid valve 18, metallurgy are specially
With mass flow controller 19, check valve 20, second pressure gauge 16b, pressure reducing valve 21, third ball valve 14c, manual bypass includes the
Four ball valve 14d, manual modulation valve 22, the front end of manual bypass are installed between first pressure gauge 16a and the second ball valve 14b, hand
The end of dynamic bypass is installed between check valve 20 and second pressure gauge 16b, is become with main the second ball valve 14b for blowing branch, pressure
Send device 17, solenoid valve 18, the dedicated mass flow controller 19 of metallurgy, check valve 20 in parallel；For it is main blow branch break down after,
Manual operation application, pipeline parts connection relationship, argon gas pipe-line system are positioned in control cabinet, the pressure in argon gas pipe-line system
Transmitter 17, pressure reducing valve 21 there is mechanical and electronic type dual-pressure automatic compensation function, inlet pressure arbitrarily to fluctuate, out
Mouth pressure adaptive, not by back pressure disturbing influence.
The electric control system, including Argon control system PLC, touch screen, host computer operating system, network exchange
Machine, continuous casting basic automation systems, each system are connect by ethernet communication with network switch, molten steel weighing system in ladle
It collects, Metal Weight is uploaded to by ethernet communication, network switch and blown to continuous casting basic automation systems in transmission ladle
Argon control system PLC, as shown in Figure 7.Those skilled in the art can select according to actual needs, or select existing skill
The control system of art.
The Argon control system PLC collects first pressure gauge (16a) pressure value, the dedicated mass flow controller of metallurgy
(19) Metal Weight value in flow value, second pressure gauge (16b) pressure value and ladle, and execute the argon of Argon control system PLC
Throughput automatically controls instruction, according to the variation of molten steel net weight in ladle, adjust automatically argon flow.
The present invention also provides a kind of Argon metallurgical methods of annular air curtain barricade wall using above-mentioned ladle, including following step
It is rapid:
The first step receives ladle and opens and pours signal, starts Argon, and what initial argon flow was set as that ladle soft blow determines blows
Argon flow, generally 60-120NL/min；
Second step, during steel ladle pouring, according to the variation of molten steel net weight in ladle, Serial regulation argon flow, mistake
It is initial when molten steel net weight × ladle when remaining molten steel net weight ÷ ladle completely wraps in journey argon flow setting value=ladle completely wraps
Argon flow；
Third step, it is artificial to determine that ladle slag or Lower proterozoic group system alarm occurs, receives ladle and stop pouring signal, stop
The annular air curtain barricade wall of ladle is blown into argon gas.
Beneficial effects of the present invention:
1) the ventilative ring of setting disperse formula in the annular air curtain barricade wall ontology of ladle of the present invention, is arranged in argon flow control
A set of argon gas pipe-line system and electric control system, in Con casting ladle casting process, whole process is blown into argon gas, and according in ladle
The variation of molten steel net weight, adjust automatically argon flow, argon gas form small Argon Bubble, most of argon gas through the ventilative ring of disperse formula
Bubble moves upwards, and forms cyclic annular air curtain barrier around ladle upper nozzle, carries out gas to the molten steel that will enter ladle upper nozzle
It washes, promotes inclusion floating and removal, and in the steel ladle pouring later period, effectively inhibit ladle caused by conflux vortex and the heavy hole of drainage
Slag, but solve molten steel ladle face persistently reduce under conditions of, because argon blowing rate adjustment not in time, blow brokenly steel slag face cause
Molten steel slag problem, not only increase the cleanliness of molten steel using the present invention, and reduce molten steel in ladle and pour surplus, answer
With the present invention, than Comparison study example CN201070669Y, (patent No.: 200720151456.3) it is year-on-year to pour surplus for the molten steel in ladle
17% or more is reduced, continuous casting billet sample electrolysis field trash weight reduces 23% or more on year-on-year basis.
2) the height h of the ventilative ring of disperse formula of the present invention, annulus is 100~200mm, with high-purity corundum, mullite etc.
It for main material, is produced using isostatic pressing process, so that bulk density >=2.80g/cm3, so that the air hole in dispersion ring
Uniformly, Dispersed precipitate, argon gas form (the hydraulic model trial measurement of continuous, equally distributed small Argon Bubble through the ventilative ring of disperse formula
The diameter < 1mm of bubble), it is described better than Chinese patent literature CN107225231A (patent No. 201710575311.4) to use machine
The disperse formula of molded production is breathed freely ring, and the disperse formula for solving mechanical pressing production breathes freely that ring gas permeability is irregular, bulk density
The mass defects such as small are better than the Chinese patent literature CN104028739B (patent No.: the ventilative pottery described in 201410274221.8)
Porcelain stick, solve argon gas through permeable-gas ceramics stick formed Argon Bubble closeness is small etc. that performances are insufficient so that the present invention is further
Improving small Argon Bubble drives inclusion floating, the Argon metallurgical effect of removal and inhibition conflux vortex and the heavy hole of drainage to cause
Ladle roughing slag function, using the present invention than Comparison study example CN104028739B (patent No.:
201410274221.8) molten steel in ladle pours surplus and reduces 7% or more on year-on-year basis, and it is year-on-year that continuous casting billet sample is electrolysed field trash weight
Reduce 33% or more.
Detailed description of the invention
Fig. 1 is ladle annular air curtain barricade wall structure A-A schematic cross-sectional view in the embodiment of the present invention.
Fig. 2 is ladle annular air curtain barricade wall structure schematic top plan view in the embodiment of the present invention.
Fig. 3 is the ventilative ring structure schematic diagram of disperse formula in the embodiment of the present invention.
Fig. 4 is ladle annular air curtain barricade wall scheme of installation in the embodiment of the present invention.
Fig. 5 is that ladle annular air curtain barricade wall installs partial enlargement diagram in the embodiment of the present invention.
Fig. 6 is argon gas pipeline system schematic in the embodiment of the present invention.
Fig. 7 is to be electrically connected schematic diagram in the embodiment of the present invention.
In figure, 1. ladle annular air curtain barricade wall ontologies；The ring 2. disperse formula is breathed freely；3. gas chamber；4. air inlet pipe；5. mounting hole；
6. air inlet pipe mounting hole；7. ladle upper nozzle brick cup；8. air inlet connects metal tube；9. ladle involucrum；10. ladle upper nozzle brick cup
Melt pit is installed；11. ladle permanent lining；12. ladle working lining castable；13. ladle working lining residue pile；14. ball valve (including the
One ball valve 14a, the second ball valve 14b, third ball valve 14c, the 4th ball valve 14d)；15. pneumatic filter；16. pressure gauge (including the
One pressure gauge 16a, first pressure gauge 16b)；17. pressure transmitter；18. solenoid valve；19. the dedicated mass flow controller of metallurgy；
20. check valve；21. pressure reducing valve；22. manual modulation valve.
Specific embodiment
The present invention is further described with embodiment with reference to the accompanying drawing, but is not limited only to this.Part not in the detailed description of the invention,
The prior art can be used.
Embodiment 1:
A kind of annular air curtain barricade wall for ladle, as shown in Figure 1, Figure 2, Figure 3 shows, including annular air curtain barricade wall ontology 1, more
Formula ventilative ring 2, gas chamber 3, air inlet pipe 4 are dissipated, the cross section of annular air curtain barricade wall ontology 1 is in circular ring shape, annular air curtain barricade wall ontology
Middle part be provided with mounting hole 5, be provided in annular air curtain barricade wall ontology 1 disperse formula breathe freely ring 2, disperse formula breathe freely ring top
Stretching out the upper surface of annular air curtain barricade wall ontology 1, gas chamber 3 is breathed freely the bottom of ring by burying loose tool one-pass molding in disperse formula,
The side of gas chamber 3 is connected with air inlet pipe 4, and one end of air inlet pipe is connected to gas chamber, and the other end is stretched from the side of air curtain barricade wall ontology 1
Out, which is characterized in that in Con casting ladle casting process, ladle dispersion ring ventilating filling pipe end brick cup whole process Argon has purification
Molten steel ladle inhibits two Argon metallurgical functions of steel ladle pouring slag.
Disperse formula of the present invention breathe freely ring 2 with high-purity corundum, mullite etc. for main material, using isostatic pressing, in
Warm firing process production, bulk density >=2.80g/cm3, air hole in dispersion ring uniformly, Dispersed precipitate, argon gas penetrates disperse
The ventilative ring of formula forms continuous, equally distributed small Argon Bubble (the diameter < 1mm of hydraulic model trial measurement bubble), specially better than China
(patent No.: 200720151456.3) described by a kind of wall prepared by gas permeable material, volume is close by sharp document CN201070669Y
Spend that small, intensity is low, the low technical problem of service life is better than the Chinese patent literature CN107225231A (patent No.
201710575311.4) the ventilative ring of the corundum disperse formula of mechanical pressing production, the disperse formula for solving mechanical pressing production are saturating
The mass defects such as compression ring gas permeability is irregular, bulk density is small, better than Chinese patent literature CN104028739B (patent No.:
201410274221.8) it is big, close to solve the argon gas bulb diameter that argon gas is formed through permeable-gas ceramics stick for the permeable-gas ceramics stick described in
The performances such as intensity is small are insufficient, using the present invention than the Comparison study example CN104028739B (patent No.: 201410274221.8) steel
Surplus of molten steel in packet pouring reduces 19% or more on year-on-year basis, and continuous casting billet sample electrolysis field trash weight reduces 23% or more on year-on-year basis.
The height H of the annular air curtain barricade wall ontology 1 is 150mm.
The annular air curtain barricade wall ontology 1, corundum castable moulding by casting, bulk density >=3.0g/cm3, the anti-folding of high temperature
Intensity >=12Mpa, crushing strength under high temperature >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=2%.
The disperse formula is breathed freely ring 2, and cross section is in a rectangular trapezoid in circular ring shape, vertical section, and annulus lower width x is
55mm, upper width y are 50mm, and height h is 100mm.
The disperse formula is breathed freely mounting hole 5 in the middle part of ring, and cross section is rounded, diameter of a circle size and is set on ladle
The diameter matching design of pocket block 7, and lower part circular diameter D2 is 2mm bigger than top circular diameter D1, convenient for demoulding.
The height z that annular 1 upper surface of air curtain barricade wall ontology is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 5mm.
The lower end of ventilative 2 side wall of ring of the disperse formula and annular 1 side wall distance a of air curtain barricade wall ontology are 25mm.
The gas chamber 3 generally circular ring shape, the vertical section of gas chamber are semicircle, and radius R is 10mm, are arranged on gas chamber 3
Air inlet pipe mounting hole 6, the diameter d of air inlet pipe mounting hole are 12mm.
The air inlet pipe 4, air inlet connection 8 material of metal tube are heat-resistance stainless steel round tube, and specification is ￠ 12 × 1.3
(outer diameter 12mm, wall thickness 1.3mm).
The installation of the annular air curtain barricade wall for ladle installs ladle upper nozzle brick cup 7 using the prior art, in steel
The corundum chamotte for smearing 10mm thickness on 7 outer wall of pocket block is wrapped, the mounting hole 5 of ladle annular air curtain barricade wall is set in steel
7 top of outer wall of pocket block is wrapped, so that the upper surface of ladle annular air curtain barricade wall ontology 1 and bottom of steel ladle working lining 12
Working face is concordant, then one end of air inlet connection metal tube 8 is connect with air inlet pipe 4, and the other end is worn from the packet bottom of ladle involucrum 9
Out, then ladle upper nozzle brick cup installation melt pit 10 is poured using ladle working lining castable 12, filled and led up, so far complete ladle
The installation of annular air curtain barricade wall, after after ladle seat is to continuous casting machine revolving platform, by air inlet connection metal tube 8 and argon gas gas source
Connection.
The ladle working lining castable is the corundum-spinel castable of prior art production.
Utilize the annular air curtain barricade wall Argon metallurgical plant of above-mentioned ladle, which is characterized in that set in argon flow control
A set of argon gas pipe-line system and electric control system are set, molten steel weighing signal in ladle is introduced, according to molten steel net weight in ladle
Variation, Serial regulation argon flow solve under conditions of liquid steel level persistently reduces in ladle, because argon blowing rate adjustment is too late
When, blow brokenly the molten steel top of the slag initiation molten steel slag problem.
The argon gas pipe-line system, as shown in fig. 6, being divided into master blows branch and manual bypass, wherein the main branch that blows includes the
One ball valve 14a, pneumatic filter 15, first pressure gauge 16a, the second ball valve 14b, pressure transmitter 17, solenoid valve 18, metallurgy are specially
With mass flow controller 19, check valve 20, second pressure gauge 16b, pressure reducing valve 21, third ball valve 14c, manual bypass includes the
Four ball valve 14d, manual modulation valve 22, the front end of manual bypass are installed between first pressure gauge 16a and the second ball valve 14b, hand
The end of dynamic bypass is installed between check valve 20 and second pressure gauge 16b, is become with main the second ball valve 14b for blowing branch, pressure
Send device 17, solenoid valve 18, the dedicated mass flow controller 19 of metallurgy, check valve 20 in parallel；For it is main blow branch break down after,
Manual operation application, pipeline parts connection relationship, argon gas pipe-line system are positioned in control cabinet, the pressure in argon gas pipe-line system
Transmitter 17, pressure reducing valve 21 there is mechanical and electronic type dual-pressure automatic compensation function, inlet pressure arbitrarily to fluctuate, out
Mouth pressure adaptive, not by back pressure disturbing influence.
The electric control system, including Argon control system PLC, touch screen, host computer operating system, network exchange
Machine, continuous casting basic automation systems, each system are connect by ethernet communication with network switch, molten steel weighing system in ladle
It collects, Metal Weight is uploaded to by ethernet communication, network switch and blown to continuous casting basic automation systems in transmission ladle
Argon control system PLC, as shown in Figure 7.Those skilled in the art can select according to actual needs, or select existing skill
The control system of art.
The Argon control system PLC collects first pressure gauge (16a) pressure value, the dedicated mass flow controller of metallurgy
(19) Metal Weight value in flow value, second pressure gauge (16b) pressure value and ladle, and execute the argon of Argon control system PLC
Throughput automatically controls instruction, according to the variation of molten steel net weight in ladle, adjust automatically argon flow.
Utilize the Argon metallurgical method of the annular air curtain barricade wall of above-mentioned ladle, including the following steps: Argon control system
It is as follows that the argon flow of system PLC automatically controls instruction:
The first step receives ladle and opens and pours signal, starts Argon, and what initial argon flow was set as that ladle soft blow determines blows
Argon flow is 60NL/min；
Second step, during steel ladle pouring, according to the variation of molten steel net weight in ladle, Serial regulation argon flow, mistake
It is initial when molten steel net weight × ladle when remaining molten steel net weight ÷ ladle completely wraps in journey argon flow setting value=ladle completely wraps
Argon flow；
For example, molten steel net weight when ladle completely wraps is 130 tons, when 65 ton hour of molten steel net weight remaining in ladle, process argon gas
Flow setting value=65 130 × 60NL/min=30NL/min of ÷.
Third step, it is artificial to determine that ladle slag or Lower proterozoic group system alarm occurs, receives ladle and stop pouring signal, stop
The annular air curtain barricade wall of ladle is blown into argon gas.
The argon gas pipeline system element, is market purchasing, wherein the ball valve 14 (including the first ball valve 14a, second
Ball valve 14b, third ball valve 14c, the 4th ball valve 14d) model specification be 304SS-1/2, the model specification of pneumatic filter 15
For BK110-3, the model specification of pressure gauge 16 (including first pressure gauge 16a, first pressure gauge 16b) is YT40, pressure inverting
The model specification of device 14 is 8323-25-G1/2, and the model specification of solenoid valve 18 is 5281-1/2-NBR, the dedicated quality stream of metallurgy
The model specification of amount controller 19 is Flox (on) s, and range 0-200NL/min, the model specification of pressure reducing valve 21 is BK100-
2, the model specification of manual modulation valve 22 is 28-1/2-MS.
The electric control system element, is market purchasing, wherein the model specification of the PLC control system is west gate
Sub- S7 series, the model specification of PLC analog module are 4AI/2AO, and the model specification of touch screen is 7 cun of touch screens of Siemens,
The model specification of host computer operating system is D610,6.0 or more upper computer software WIN CC.
Embodiment 2,
The annular air curtain barricade wall of ladle as described in Example 1, the difference is that:
The height H of the annular air curtain barricade wall ontology 1 is 250mm.
The disperse formula is breathed freely ring 2, and cross section is in a rectangular trapezoid in circular ring shape, vertical section, and annulus lower width x is
65mm, upper width y are 60mm, and height h is 200mm.
The height z that annular 1 upper surface of air curtain barricade wall ontology is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 10mm.
The lower end of ventilative 2 side wall of ring of the disperse formula and annular 1 side wall distance a of air curtain barricade wall ontology are 20mm.
It is as follows that the argon flow of the Argon control system PLC automatically controls instruction:
The first step receives ladle and opens and pours signal, starts Argon, and what initial argon flow was set as that ladle soft blow determines blows
Argon flow is 120NL/min；
Second step, during steel ladle pouring, according to the variation of molten steel net weight in ladle, Serial regulation argon flow, mistake
It is initial when molten steel net weight × ladle when remaining molten steel net weight ÷ ladle completely wraps in journey argon flow setting value=ladle completely wraps
Argon flow；
For example, molten steel net weight when ladle completely wraps is 130 tons, when 26 ton hour of molten steel net weight remaining in ladle, process argon gas
Flow setting value=26 130 × 120NL/min=24NL/min of ÷.
Third step, it is artificial to determine that ladle slag or Lower proterozoic group system alarm occurs, receives ladle and stop pouring signal, stop
The annular air curtain barricade wall of ladle is blown into argon gas.
Embodiment 3,
It is used for the annular air curtain barricade wall of ladle as described in Example 1, the difference is that:
The height H of the annular air curtain barricade wall ontology 1 is 200mm.
The disperse formula is breathed freely ring 2, and cross section is in a rectangular trapezoid in circular ring shape, vertical section, and annulus lower width x is
60mm, upper width y are 55mm, and height h is 160mm.
The height z that annular 1 upper surface of air curtain barricade wall ontology is stretched out in the upper end of the ventilative ring 2 of the disperse formula is 7mm.
The lower end of ventilative 2 side wall of ring of the disperse formula and annular 1 side wall distance a of air curtain barricade wall ontology are 30mm.
It is as follows that the argon flow of the Argon control system PLC automatically controls instruction:
The first step receives ladle and opens and pours signal, starts Argon, and what initial argon flow was set as that ladle soft blow determines blows
Argon flow is 100NL/min；
Second step, during steel ladle pouring, according to the variation of molten steel net weight in ladle, Serial regulation argon flow, mistake
It is initial when molten steel net weight × ladle when remaining molten steel net weight ÷ ladle completely wraps in journey argon flow setting value=ladle completely wraps
Argon flow；
For example, molten steel net weight when ladle completely wraps is 130 tons, when 13 ton hour of molten steel net weight remaining in ladle, process argon gas
Flow setting value=13 130 × 100NL/min=10NL/min of ÷.
Third step, it is artificial to determine that ladle slag or Lower proterozoic group system alarm occurs, receives ladle and stop pouring signal, stop
The annular air curtain barricade wall of ladle is blown into argon gas.
Comparative experiments example
Comparative example 1: Chinese patent literature CN201070669Y (patent No.: 200720151456.3) discloses a kind of air curtain gear
Wall.
Comparative example 2: Chinese patent literature CN104028739B (patent No.: 201410274221.8) discloses a kind of ladle
Ventilating filling pipe end brick cup and its method for controlling ladle roughing slag.
By air curtain barricade wall and comparison described in the annular air curtain barricade wall for being used for ladle of 1-3 of the embodiment of the present invention and comparative example 1
Molten steel of the ladle pocket block described in example 2 in the ladle that certain factory produces Ultra-low carbon DC04 grades of cold-rolled strip pours surplus situation and carries out
Comparison, takes bulk sample electrolysis sample at slab 1/4 respectively, is processed into diameter and is 60mm, is highly the pole of 100mm, carries out big
Sample electrolysis is mingled with analyte detection comparison, as a result see the table below 1.
Table 1
By the data comparison of upper table 1, using the present invention than Comparison study example CN201070669Y (patent No.:
200720151456.3) molten steel in ladle pours surplus and reduces 17% or more on year-on-year basis, and it is same that continuous casting billet sample is electrolysed field trash weight
Than reducing 23% or more, using the present invention than the Comparison study example CN104028739B (patent No.: 201410274221.8) ladle
In molten steel pour surplus and reduce 7% or more on year-on-year basis, continuous casting billet sample electrolysis field trash weight reduces 33% or more on year-on-year basis, and production is answered
With the result shows that, the present invention for ladle annular air curtain barricade wall have purification molten steel ladle, inhibit steel ladle pouring slag two
A Argon metallurgical function.
Claims (10)
1. a kind of annular air curtain barricade wall for ladle, which is characterized in that saturating including annular air curtain barricade wall ontology (1), disperse formula
Compression ring (2), gas chamber (3), air inlet pipe (4), the cross section of annular air curtain barricade wall ontology (1) are in circular ring shape, annular air curtain barricade wall sheet
It is provided in the middle part of body (1) mounting hole (5), disperse formula is provided in annular air curtain barricade wall ontology (1) and is breathed freely ring (2), disperse formula
The upper surface of annular air curtain barricade wall ontology (1) is stretched out on the top of ventilative ring, and gas chamber (3) is set to the bottom of the ventilative ring of disperse formula,
The side of gas chamber (3) is connected with air inlet pipe (4), and one end of air inlet pipe is connected to gas chamber, and the other end is from air curtain barricade wall ontology (1)
Side is stretched out；
Disperse formula breathes freely ring (2) using high-purity corundum, mullite as main material, is produced using isostatic pressing, medium temperature firing process,
Bulk density >=2.80g/cm3, air hole in dispersion ring uniformly, Dispersed precipitate, argon gas forms and connects through disperse formula ring of breathing freely
Continuous, equally distributed small Argon Bubble, hydraulic model trial measure the diameter < 1mm of bubble.
2. the annular air curtain barricade wall as described in right wants 1, which is characterized in that gas chamber (3) is by embedded loose tool one-pass molding in more
Dissipate the bottom of the ventilative ring of formula.
3. the annular air curtain barricade wall as described in right wants 1, which is characterized in that it is described annular air curtain barricade wall ontology (1) height H be
150~250mm；
The annular air curtain barricade wall ontology (1), corundum castable moulding by casting, bulk density >=3.0g/cm3, high temperature break resistant intensity
>=12Mpa, crushing strength under high temperature >=80Mpa, AL2O3Content >=92%, Cr2O3Content >=2%.
4. the annular air curtain barricade wall as described in right wants 1, which is characterized in that the disperse formula is breathed freely ring (2), and cross section is in circle
Annular, vertical section are in a rectangular trapezoid, and annulus lower width x is 55~65mm, and upper width y is 50~60mm, and height h is 100
~200mm；The height z that described annular air curtain barricade wall ontology (1) upper surface is stretched out in the upper end of the disperse formula ventilative ring (2) is 5
~10mm.The disperse formula breathe freely ring (2) side wall lower end and annular air curtain barricade wall ontology (1) side wall distance a for 20~
30mm。
5. the annular air curtain barricade wall as described in right wants 1, which is characterized in that mounting hole (5) in the middle part of the ventilative ring of the disperse formula,
Cross section is rounded, diameter of a circle size and the diameter matching design for being set in ladle upper nozzle brick cup (7), and lower part circle
Diameter D2 is 2~3mm bigger than top circular diameter D1, convenient for demoulding.
6. the annular air curtain barricade wall as described in right wants 1, which is characterized in that the gas chamber (3) generally circular ring shape, gas chamber are indulged
Section is semicircle, and radius R is 10~11mm, and air inlet pipe mounting hole (6) are arranged on gas chamber (3), air inlet pipe mounting hole it is straight
Diameter d is 12~13mm.Preferably, the diameter d of air inlet pipe mounting hole is 12mm.
7. such as the installation method of any one of claim 1-6 annular air curtain barricade wall told a story, including the following steps:
(1) ladle upper nozzle brick cup (7) are installed,
(2) the corundum chamotte that 10~15mm thickness is smeared on ladle upper nozzle brick cup (7) outer wall, by ladle annular air curtain barricade wall
Mounting hole (5) be set in outer wall (7) top of ladle upper nozzle brick cup so that ladle annular air curtain barricade wall ontology (1) is upper
Surface is concordant with the working face of bottom of steel ladle working lining (12),
(3) one end by air inlet connection metal tube (8) is connect with air inlet pipe (4), and the other end is worn from the packet bottom of ladle involucrum (9)
Out,
(4) ladle upper nozzle brick cup installation melt pit (10) is poured using ladle working lining castable, filled and led up, so far complete ladle
The installation of annular air curtain barricade wall,
(5) after which after ladle seat is to continuous casting machine revolving platform, air inlet connection metal tube (8) is connected to argon gas gas source.
8. a kind of Argon metallurgical plant using annular air curtain barricade wall described in any one of claims 1-6, which is characterized in that
A set of argon gas pipe-line system and electric control system are set in argon flow control, introduce molten steel weighing signal in ladle, according to
The variation of molten steel net weight in ladle, Serial regulation argon flow.
9. Argon metallurgical plant as claimed in claim 8, which is characterized in that
The argon gas pipe-line system is divided into master and blows branch and manual bypass, wherein the main branch that blows includes the first ball valve 14a, gas
The dedicated mass flow control of filter 15, first pressure gauge 16a, the second ball valve 14b, pressure transmitter 17, solenoid valve 18, metallurgy
Device 19, check valve 20, second pressure gauge 16b, pressure reducing valve 21, third ball valve 14c, manual bypass include the 4th ball valve 14d, manually
Regulating valve 22, the front end of manual bypass are installed between first pressure gauge 16a and the second ball valve 14b, the end peace of manual bypass
Loaded between check valve 20 and second pressure gauge 16b, the second ball valve 14b, the pressure transmitter 17, solenoid valve of branch are blown with master
18, the dedicated mass flow controller 19 of metallurgy, check valve 20 are in parallel；For it is main blow branch break down after, manual operation application,
Pipeline parts connection relationship, argon gas pipe-line system are positioned in control cabinet, pressure transmitter 17, decompression in argon gas pipe-line system
There is valve 21 mechanical and electronic type dual-pressure automatic compensation function, inlet pressure arbitrarily to fluctuate, and outlet pressure is adaptive,
Not by back pressure disturbing influence；
The electric control system, including Argon control system PLC, touch screen, host computer operating system, network switch, company
Basic automation systems are cast, each system is connect by ethernet communication with network switch, molten steel weighing system collection in ladle,
It sends Metal Weight in ladle and Argon control is uploaded to by ethernet communication, network switch to continuous casting basic automation systems
System PLC processed；
The Argon control system PLC collects dedicated mass flow controller (19) stream of first pressure gauge (16a) pressure value, metallurgy
Metal Weight value in magnitude, second pressure gauge (16b) pressure value and ladle, and execute the argon flow of Argon control system PLC
Instruction is automatically controlled, according to the variation of molten steel net weight in ladle, adjust automatically argon flow.
10. a kind of Argon metallurgical method using annular air curtain barricade wall described in any one of claims 1-6, including following step
It is rapid:
The first step receives ladle and opens and pours signal, starts Argon, and initial argon flow is set as the Argon stream that ladle soft blow determines
Amount, generally 60-120NL/min；
Second step, during steel ladle pouring, according to the variation of molten steel net weight in ladle, Serial regulation argon flow, process argon
Initial argon gas when molten steel net weight × ladle when remaining molten steel net weight ÷ ladle completely wraps in throughput setting value=ladle completely wraps
Flow；
Third step, it is artificial to determine that ladle slag or Lower proterozoic group system alarm occurs, receives ladle and stop pouring signal, stop ladle
Annular air curtain barricade wall be blown into argon gas.
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