CN104561452B - Dust the device and method of single mouth vacuum deaeration refining molten steel at a kind of end - Google Patents
Dust the device and method of single mouth vacuum deaeration refining molten steel at a kind of end Download PDFInfo
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Abstract
The invention belongs to Steel Refining technical field, dust the device and method of single mouth vacuum deaeration refining molten steel particularly to a kind of end.The inventive system comprises air supply system, powder spraying system, single mouth vacuum degassing refining furnace and the end dusts element, wherein separate three gas circuits on the air-flow distributor of air supply system to be connected with powder spraying system, powder air delivery tube in the powder spraying system element that dusts the end of with is connected, the end element that dusts is built by laying bricks or stones bottom the ladle furnace of single mouth vacuum degassing refining furnace, and the vacuum chamber lower ending opening of single-mouth refining furnace also inserts ladle molten bath.The method of single mouth vacuum deaeration refining molten steel of dusting at the bottom of the present invention is first blowing gas stirring molten steel, then under the delivery of carrier gas stream, by end element winding-up of dusting, powder is entered ladle, treats that the winding-up time terminates, enter next one cycle of operation.The present invention is easily achieved, with short production cycle, and production capacity is high, decreases high hopper, the equipment investment of wire feeder structure and operation cost, and technological operation is simple, is beneficial to realize energy-saving and emission-reduction.
Description
Technical field
The invention belongs to Steel Refining technical field, dust the dress of single mouth vacuum deaeration refining molten steel particularly to a kind of end
Put and method.
Background technology
In steel refining, the conventional vacuum deaeration refining molten steel method used, is to be tied mutually with vacuum degassing technology by ladle refining
Close, a kind of vacuum processing method of formation.Single-mouth refining furnace is the outer essence of the Novel furnace transformed by RH nineteen seventies
Refining device, it is while remaining the original metallurgical function of RH method, and its two dip pipes change into the list dipping being relatively large in diameter
Pipe, changes the rising dip pipe Argon of RH into ladle bottom bias Argon simultaneously, after bag bottom blowing enters argon, utilizes airlift pump former
Reason guides molten steel to produce raising and lowering stream stock, and then generation circulates, and removes gas in vacuum chamber.This device is increasing
While adding molten steel circular flow, increase Argon Bubble ascending path, make full use of the stirring capacity of argon, improve vacuum and take off
The affinabilities such as carbon, desulfurization, degassing, rapid alloying, specifically have following several respects a little:
(1) refining efficiency is high, can efficiently decarburization and effective desulfurization；
(2) simple in construction, the resistance to material life-span is uniform, easy to maintenance；
(3) dip pipe end face is big, and molten steel circulation is big；
(4) can be used for low capacity ladle, RH is then difficult to；
(5) argon consumption is few, cost-effective；
(6) molten steel splash is low, is difficult to dross in vacuum chamber.
Single-mouth refining furnace is from proposing to have so far the history of more than 30 year, in the middle of the evolution of these decades, this skill
Art has been also carried out constantly groping, and has derived refining equipment and the methods such as S-DH, REDA, and the container in REDA equipment has had one
The individual suction tube bigger than conventional diameter and vacuum tank no longer vertically move, and argon is blown into inside entrance container from ladle bottom
And formation molten steel circulates between container inside and ladle.SUS-REDA(Steel Use Stainless-
Revolutionary Degassing Activator) except may be used for smelting suprelow carbon steel it can also be used to stainless smelting
Refining, it is mainly characterized by expanding, as it is shown in figure 1, effectively alleviate vacuum deaeration refining mistake the sectional area of internal vacuum chamber
The journey splash to vacuum chamber top.
At present, single mouth stove mainly carries out refine by top lance blowing powder, and single-mouth refining furnace is tied with powder spraying apparatus
Conjunction carries out desulfurization when going to be mingled with, and is using argon as carrier, by immersing spray gun, the refining agent of granular is sprayed into molten steel, due to
Spray gun is to consume spare unit, and price is higher, and its life-span is directly connected to the cost of refining treatment technique, and spray gun just inserts molten steel
Unavoidably to soak with slag contacts generation slag, scouring is one of key factor of shortening spray gun service life；Spray gun stroke
Necessarily, molten steel liquid level the most likely changes, and causing spray gun to immerse is not to be exactly the most shallow the most deeply, and impact operates to obtain stability,
It is unfavorable for producing direct motion；And once run into power outage when jetting, not only spray gun damages, whole Baogang liquid is likely to report
Useless, submerged lance also brings along the problems such as the secondary pollution of splash or molten steel is serious.
Summary of the invention
For the deficiencies in the prior art, the present invention discloses a kind of end and dusts the dress of single mouth vacuum deaeration refining molten steel
Put and method, i.e. SSVD BPI method (Single Snokel Vacuum Degassing Bottom Powder
Injection), by list mouth stove vacuum deaeration refining method being organically combined with end injection refining, it is different from the single mouth refine of tradition
Stove injection refining, it is therefore an objective to strengthen mixing effect, improves the recovery rate spraying into powder, and shortening processes the cycle, improves production capacity,
Improve steel quality, reduce the production cost of high added value high-quality steel.
Dust the device of single mouth vacuum deaeration refining molten steel at the end of the present invention, true including air supply system, powder spraying system, single mouth
Empty degassing refining furnace and the end, dusted element；
Wherein said air supply system includes air accumulator and air-flow distributor, and air accumulator is connected with air-flow distributor, from gas
Three gas circuits are separated on fluidic distributor, equipped with effusion meter and Pressure gauge in every gas circuit, wherein the first gas circuit and powder spraying system
Powder spraying pot connects, and the second gas circuit is connected with the fluidising chamber of powder spraying system, and the 3rd gas circuit is connected with the mixing chamber of powder spraying system；
Described powder spraying system includes storage bin, powder spraying pot, fluidising chamber and mixing chamber, and wherein storage bin is positioned on powder spraying pot
Portion, is connected with powder spraying pot by the first baiting valve, and powder spraying pot bottom is the fluidising chamber of inverted cone shape, by second time bottom fluidising chamber
Material valve is connected with the top of mixing chamber, and mixing chamber side is connected with the 3rd gas circuit, and opposite side is connected with powder air delivery tube, described
The powder air delivery tube other end element that dusts the end of be connected；
The element that dusts of the described end is built by laying bricks or stones bottom the ladle furnace of single mouth vacuum degassing refining furnace, and runs through ladle furnace bottom
Portion, upper end contacts with molten steel；
Described single-mouth refining furnace includes ladle, vacuum chamber and gas extraction system, and ladle is built with molten steel, the molten steel bath degree of depth
Depending on refining ladle tonnage, vacuum chamber is positioned at ladle top, and for single mouth, lower ending opening also inserts ladle molten bath, on vacuum chamber
Portion is connected with gas extraction system.
The element that dusts of the described end includes air brick and air receiver, and air brick is made up of refractory material, is the seam of truncated cone-shaped
Gap type air brick, is arranged above with rectilinear slot or annulus, and rectilinear slot is with the element central that dusts for the center of circle along dusting unit
Part radial direction is arranged radially, and annulus is concentric with the element central that dusts, and rectilinear slot width is 0.08 ~ 0.3mm, bar
Number is 10 ~ 80；Annulus width is 0.08 ~ 0.3mm, and bar number is 2 ~ 60, and air brick is run through in gap, the outer bread of air brick
Wrapping up in steel bushing, lower end is connected with air receiver by flange or is directly welded on air receiver.The end arrangements of components that dusts is
Distance 0 ~ 0.7 times of ladle furnace bottom center ladle furnace bottom radius, number is 1 or 2, symmetrically or asymmetric manner is arranged.
Use said apparatus to carry out the end to dust the method for single mouth vacuum deaeration refining molten steel, follow the steps below:
(1) just furnace tapping, ladle hangs in work parking stall, closes the valve of powder spraying system, opens the air valve of air supply system,
Gas enters ladle molten bath by the 3rd gas circuit via the clearance type element that dusts, and molten steel carries out stirring of blowing, treats that winding-up is stable,
Observing ladle molten bath slag circle size, slowly decline vacuum chamber, vacuum chamber lower ending opening is inserted ladle molten bath, vacuum chamber uses single
Mouth tedge, inserts the molten steel degree of depth 200 ~ 600mm, avoids vacuum chamber to contact slag blanket simultaneously, then vacuum chamber is carried out evacuation
Processing, reduce blowing gas flow simultaneously, molten steel rises to certain altitude in vacuum chamber；
(2) powder is joined powder spraying pot from storage bin, close the first baiting valve, added to powder spraying pot by the first gas circuit
Pressure, is tentatively fluidized powder by the second gas circuit simultaneously, when the pressure in fluidising chamber is more than three airline pressure, opens
Second baiting valve, controls powder flow by the second baiting valve, and in fluidising chamber, the powder of preliminary fluidisation enters in mixing chamber, control
Make gas flow and the pressure of the 3rd gas circuit so that the entrance powder air delivery tube of powder air-flow safety and stability in mixing chamber；
(3) powder of powder air delivery tube is entered, under the delivery of carrier gas stream, by the element that dusts at the bottom of clearance type, winding-up
Entering ladle molten bath, jetting pressure controls at 0.3 ~ 1.5MPa, requires that powder throughput ratio, less than 1, is waited to jet in the middle of winding-up process
Time terminates, and closes second time powder valve, closes the first gas circuit, closes the second gas circuit, slowly promote vacuum chamber, is improved by vacuum chamber
Depart from ladle molten bath, close the 3rd gas circuit, enter next cycle of operation.
Described blowing powder is decarburizer, deoxidizer, desulfurizing agent, Dephosphorising agent and the alloy of application in existing refinery practice
Change powder, described alloying powder be the compound of ferrum be that base contains and required adds the fine ore of alloy, ferromanganese fine ore, chromium
Fine iron breeze, nikel powder or rare earth element powder, wherein said alloying element is manganese, chromium, nickel or rare earth element, the granularity of powder
It is 200 ~ 800 mesh.
The gas of described winding-up is argon, nitrogen, carbon dioxide or natural gas.
The described powder winding-up time calculates according to the following formula:
In formula, t1For blowing powder operating time, m1For powder addition, β1For powder throughput ratio, ρg1For blowing gas
Density, Qg1For blowing gas volume flow.
Compared with prior art, the feature of the present invention and having the beneficial effects that:
(1) present invention use the end to dust powder that the method for single mouth vacuum deaeration refining molten steel sprays into can all incorporate steel
Liquid, utilizes whole strokes of the molten steel degree of depth simultaneously, increases the powder time of staying in molten steel, improves the utilization of Refining powders
Rate, improves the recovery rate of alloy powder, shortens the operating time of single mouth vacuum degassing refining furnace, reduces cost, improve
Refining efficiency；
(2) present invention uses the dust method of single mouth vacuum deaeration refining molten steel of the end to overcome tradition single mouth vacuum outgas essence
Liquid spray gun easily blocks, service life is short in steel-making, fluctuation of service, spray gun easily peel off the defects such as pollution molten steel, reduces and produces into
This, improve processing safety, improves a steel quality of production, is beneficial to produce lasting, reliable, stable carrying out, and essence of dusting
Refining process is without splash, reliable and stable；
(3) present invention uses the end to dust the method for single mouth vacuum deaeration refining molten steel by list mouth vacuum outgas method and Ladle Bottom
Injection refining combines, it is possible to achieve vacuum decarburization, vacuum outgas, desulfurization, dephosphorization, uniform molten steel temperature, uniform molten steel component
Function with removal of inclusions；
(4) present invention uses the dust method of single mouth vacuum deaeration refining molten steel of the end to be easily achieved, with short production cycle, produces
Ability is high, decreases high hopper, the equipment investment of wire feeder structure and operation cost, and technological operation is simple, is beneficial to realize energy-conservation
Reduce discharging.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of single mouth vacuum deaeration refining molten steel of dusting the end of the present invention；
Fig. 2 is the component structure schematic diagram that dusts at the end in Fig. 2；
Fig. 3 is the device schematic diagram of SUS-REDA technique in prior art；
Wherein: 1: air accumulator；2: air valve；3: air-flow distributor；4: the first Pressure gauges；5: first-class gauge；6: second
Gauge；7: the three effusion meters；8: the second Pressure gauges；9: the three Pressure gauges；10: the four Pressure gauges；11: storage bin；12: the first times
Material valve；13: powder spraying pot；14: fluidising chamber；15: the second baiting valves；16: mixing chamber；17: powder air delivery tube；18: dust unit in the end
Part；19: molten steel；20: ladle；21: covering slag；22: vacuum chamber；23: gas extraction system；24: spray gun；25: pipeline；26: gas is cold
But device；27: steel bushing；28: air brick；29: dust member slot；30: connecting bolt；31: dust element air receiver.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Dust the device of vacuum deaeration refining molten steel at the end of the present invention, as depicted in figs. 1 and 2,
Dust the device of vacuum deaeration refining molten steel at the end of the present invention, takes off including air supply system, powder spraying system, single mouth vacuum
Gas refining furnace and the end, dusted element；
Wherein said air supply system includes air accumulator 1 and air-flow distributor 3, and air accumulator 1 is connected with air-flow distributor 3,
Being provided with air valve 2 between air accumulator 1 and air-flow distributor, air-flow distributor 3 is provided with the first Pressure gauge 4, divides from air-flow distributor 3
Going out three gas circuits, equipped with effusion meter and Pressure gauge in every gas circuit, wherein the first gas circuit is connected with the powder spraying pot 13 of powder spraying system,
First gas circuit is provided with first-class gauge 5 and the second Pressure gauge 8, and the second gas circuit is connected with the fluidising chamber 14 of powder spraying system, and second
Gas circuit is provided with second gauge 6 and the 3rd Pressure gauge 9, and the 3rd gas circuit is connected with the mixing chamber 16 of powder spraying system, the 3rd gas circuit
It is provided with the 3rd effusion meter 7 and the 4th Pressure gauge 10；
Described powder spraying system includes storage bin 11, powder spraying pot 13, fluidising chamber 14 and mixing chamber 16, wherein storage bin 11
In powder spraying pot 13 top, being connected with powder spraying pot 13 by the first baiting valve 12, powder spraying pot 13 bottom is the fluidising chamber 14 of inverted cone shape,
Being connected with the top of mixing chamber 16 by the second baiting valve 15 bottom fluidising chamber 14, mixing chamber 16 side is connected with the 3rd gas circuit,
Opposite side is connected with powder air delivery tube 17, and described powder air delivery tube 17 element 18 that dusts the end of with is connected；
The element 18 that dusts of the described end is built by laying bricks or stones bottom the ladle furnace of single mouth vacuum degassing refining furnace, and runs through ladle furnace bottom
Portion, upper end contacts with molten steel 19；
Described single-mouth refining furnace includes ladle 20, vacuum chamber 22 and gas extraction system 23, and ladle is built with molten steel 19, molten steel
19 pool depths are depending on refining ladle tonnage, and vacuum chamber 22 is positioned at ladle 20 top, and for single mouth, lower ending opening also inserts ladle
Molten bath, vacuum chamber 22 top is connected with gas extraction system 23.
The element 18 that dusts of the described end includes air brick 28 and air receiver 31, and air brick 28 is made up of refractory material, is round
The clearance type air brick of platform shape, is arranged above with rectilinear slot or annulus, and rectilinear slot is with element 18 center of dusting as circle
The heart is arranged radially along element radius direction of dusting, and annulus is concentric with the element central that dusts, and rectilinear slot width is
0.08 ~ 0.3mm, bar number is 10 ~ 80；Annulus width is 0.08 ~ 0.3mm, and bar number is 2 ~ 60, and gap runs through ventilative
Brick, is surrounded by steel bushing 27, and lower end is connected with air receiver 31 by flange or is directly welded on air receiver 31, dusts in the end
Original paper 18 number is 1 or 2, and arrangement is distance 0 ~ 0.7 times of ladle furnace bottom center ladle furnace bottom radius, symmetrically or
Asymmetric manner is arranged.
Use said apparatus to carry out the end to dust the method for single mouth vacuum deaeration refining molten steel, follow the steps below:
(1) just furnace tapping, ladle 20 hangs in work parking stall, closes the valve of powder spraying system, opens the gas of air supply system
Valve 2, gas enters ladle molten bath by the 3rd gas circuit via the clearance type element 18 that dusts, and molten steel 19 carries out stirring of blowing, treats
Winding-up is stable, observes ladle molten bath slag circle size, slowly declines vacuum chamber 22, is melted by vacuum chamber 22 lower ending opening insertion ladle
Pond, vacuum chamber 22 uses single mouth tedge, inserts molten steel 19 degree of depth 200 ~ 600mm, avoid vacuum chamber 22 to contact slag blanket, so simultaneously
Vacuum chamber 22 carrying out evacuation process afterwards, reduces blowing gas flow simultaneously, molten steel 19 rises to necessarily in vacuum chamber 22
Highly；
(2) powder is joined powder spraying pot 13 from storage bin 11, close the first baiting valve 12, by the first gas circuit to spray
Powder tank 13 pressurizes, and is tentatively fluidized powder by the second gas circuit simultaneously, treats that the pressure in fluidising chamber 14 is more than the 3rd gas circuit
During pressure, open the second baiting valve 15, control powder flow by the second baiting valve 15, the powder of preliminary fluidisation in fluidising chamber 14
Enter in mixing chamber 16, by controlling gas flow and the pressure of the 3rd gas circuit, it is ensured that in mixing chamber 16, powder air-flow safety is steady
Fixed entrance powder air delivery tube 17；
(3) powder of powder air delivery tube 17 is entered, under the delivery of carrier gas stream, by the element 18 that dusts at the bottom of clearance type,
Winding-up enters ladle molten bath, and jetting pressure controls at 0.3 ~ 1.5MPa, requires that powder throughput ratio, less than 1, is treated in the middle of winding-up process
The winding-up time terminates, and closes the second baiting valve 15, closes the first gas circuit, closes the second gas circuit, slowly promotes vacuum chamber 22, will be true
Disengaging ladle molten bath is improved in empty room 22, closes the 3rd gas circuit, enters next cycle of operation.
Embodiment 1
Use said apparatus, illustrate as a example by the SSVD-BPI method desulfurization smelting suprelow carbon steel that dusts at the bottom of 50t, deliver gas
Body is dry argon gas, and blowing powder is 600 mesh CaO powder, and powder to air ratio is 0.8, and the winding-up time is 10min.The end dust element use
Rectilinear slot formula is dusted element, and gap width is 0.18mm, length 20mm, and gap bar number is 20, and element number of dusting is 1
Individual, being arranged in the end dusts at 0.5 times of radius of single mouth vacuum degassing refining furnace ladle bottom distance bottom centre.Single mouth vacuum outgas
It is 300mm that refining furnace inserts the molten steel degree of depth, and molten steel is lifting height 600mm in vacuum chamber, and jetting pressure is 0.5Mpa.Specifically press
Carry out according to following steps:
(1) just furnace tapping, the ladle 20 that will be equipped with molten steel hangs in work parking stall, closes the valve of powder spraying system, open
The air valve 2 of air supply system, argon enters ladle molten bath by the 3rd gas circuit via the clearance type element 18 that dusts, and regulation throughput is
50L/min, jetting pressure 0.5MPa, carry out stirring of blowing to molten steel 19, treats that winding-up is stable, observes ladle molten bath slag circle size,
Slowly declining vacuum chamber 22, vacuum chamber 22 lower ending opening is inserted ladle molten bath, vacuum chamber 22 uses single mouth tedge, inserts steel
Liquid 20 degree of depth 300mm, avoids vacuum chamber 22 to contact slag blanket simultaneously, then vacuum chamber 22 is carried out evacuation process, reduces simultaneously
Blowing gas flow rises to 600mm to 30L/min, molten steel 19 in vacuum chamber 22；
(2) the CaO powder that granularity is 600 mesh is joined powder spraying pot 13 from storage bin 11, closes the first baiting valve 12,
Pressurizeed to powder spraying pot 13 by the first gas circuit, throughput 10L/min, by the second gas circuit, powder is tentatively fluidized simultaneously,
Throughput 20L/min, when the pressure in fluidising chamber 14 is more than three airline pressure, opens the second baiting valve 15, by second
Baiting valve 15 controls powder flow, and in fluidising chamber 14, the powder of preliminary fluidisation enters in mixing chamber 16, by controlling the 3rd gas
The gas flow on road and pressure, it is ensured that the entrance powder air delivery tube 17 of powder air-flow safety and stability in mixing chamber 16；
(3) powder of powder air delivery tube 17 is entered, under the delivery of carrier gas stream, by the element 18 that dusts at the bottom of clearance type,
Winding-up enters ladle molten bath, and jetting pressure controls at 0.5MPa, requires that powder throughput ratio is 0.8 in the middle of winding-up process, winding-up
10min, treats that the winding-up time terminates, and closes the second baiting valve 15, closes the first gas circuit, closes the second gas circuit, slowly promotes vacuum
Room 22, improves vacuum chamber 22 disengaging ladle molten bath, closes the 3rd gas circuit, measures liquid steel temperature and makes it control at steel grade liquidus curve
Above 20 DEG C, casting, refining furnace enters next cycle of operation.
Claims (5)
1. dust at the bottom of one kind the device of single mouth vacuum deaeration refining molten steel, it is characterised in that includes air supply system, powder spraying system, list
Mouth vacuum degassing refining furnace and the end, dusted element；
Wherein said air supply system includes air accumulator and air-flow distributor, and air accumulator is connected with air-flow distributor, divides from air-flow
Three gas circuits are separated on orchestration, equipped with effusion meter and Pressure gauge in every gas circuit, wherein the dusting of the first gas circuit and powder spraying system
Tank connects, and the second gas circuit is connected with the fluidising chamber of powder spraying system, and the 3rd gas circuit is connected with the mixing chamber of powder spraying system；
Described powder spraying system includes storage bin, powder spraying pot, fluidising chamber and mixing chamber, and wherein storage bin is positioned at powder spraying pot top,
Being connected with powder spraying pot by the first baiting valve, powder spraying pot bottom is the fluidising chamber of inverted cone shape, by the second blanking bottom fluidising chamber
Valve is connected with the top of mixing chamber, and mixing chamber side is connected with the 3rd gas circuit, and opposite side is connected with powder air delivery tube, described
The powder air delivery tube other end element that dusts the end of with is connected；
The element that dusts of the described end is built by laying bricks or stones bottom the ladle furnace of single mouth vacuum degassing refining furnace, and runs through bottom ladle furnace, on
End contacts with molten steel；The element that dusts of the described end includes air brick and air receiver；Wherein air brick is made up of refractory material, is round
The clearance type air brick of platform shape, is arranged above with rectilinear slot or annulus, and rectilinear slot is with the element central that dusts as the center of circle
Along dusting, element radius direction is arranged radially, and annulus is concentric with the element central that dusts, and rectilinear slot width is 0.08
～0.3mm, bar number is 10～80, and annulus width is 0.08～0.3mm, and bar number is 2～60, and gap runs through ventilative
Brick, wraps up steel bushing outside air brick, lower end is connected with air receiver or is directly welded on air receiver by flange, dusts unit in the end
Number of packages mesh is 1 or 2, and arrangement is distance ladle furnace bottom center 0～0.7 times of ladle furnace bottom radius, symmetrically or non-
Symmetrical arrangement；Described single mouth vacuum degassing refining furnace includes ladle, vacuum chamber and gas extraction system, and ladle is built with steel
Liquid, the molten steel bath degree of depth is depending on refining ladle tonnage, and vacuum chamber is positioned at ladle top, and for single mouth, lower ending opening also inserts steel
Bag molten bath, vacuum chamber top is connected with gas extraction system.
2. use the end described in claim 1 to dust the method for single mouth vacuum deaeration refining molten steel device refining liquid steel, its
It is characterised by following the steps below:
(1) just furnace tapping, ladle hangs in work parking stall, closes the valve of powder spraying system, opens the air valve of air supply system, gas
Enter ladle molten bath by the 3rd gas circuit via the clearance type element that dusts, molten steel is carried out stirring of blowing, treats that winding-up is stable, observe
Ladle molten bath slag circle size, slowly declines vacuum chamber, and vacuum chamber lower ending opening is inserted ladle molten bath, and vacuum chamber uses on single mouth
Riser, inserts the molten steel degree of depth 200～600mm, avoids vacuum chamber to contact slag blanket simultaneously, then carries out vacuum chamber at evacuation
Reason, reduces blowing gas flow simultaneously, and molten steel rises to certain altitude in vacuum chamber；
(2) powder is joined powder spraying pot from storage bin, closes the first baiting valve, pressurizeed to powder spraying pot by the first gas circuit,
By the second gas circuit, powder is tentatively fluidized simultaneously, when the pressure in fluidising chamber is more than three airline pressure, open the
Two baiting valves, control powder flow by the second baiting valve, and in fluidising chamber, the powder of preliminary fluidisation enters in mixing chamber, passes through
Control gas flow and the pressure of the 3rd gas circuit, it is ensured that the entrance powder air delivery tube of powder air-flow safety and stability in mixing chamber；
(3) entering the powder of powder air delivery tube, under the delivery of carrier gas stream, by the element that dusts at the bottom of clearance type, winding-up enters
Ladle molten bath, jetting pressure controls 0.3～1.5MPa, requires that powder throughput ratio, less than 1, treats the winding-up time in the middle of winding-up process
Terminate, close second time powder valve, close the first gas circuit, close the second gas circuit, slowly promote vacuum chamber, vacuum chamber is improved and departs from
Ladle molten bath, closes the 3rd gas circuit, enters next cycle of operation.
The method of a kind of refining liquid steel the most according to claim 2, it is characterised in that described blowing powder is existing essence
Decarburizer, deoxidizer, desulfurizing agent, Dephosphorising agent and the alloying powder of application in sweetening process, described alloying powder is ferrum
Compound is that base contains the required interpolation fine ore of alloy, ferromanganese fine ore, ferrochrome fine ore, nikel powder or rare earth element powder,
Wherein said alloying element is manganese, chromium, nickel or rare earth element, and the granularity of powder is 200～800 mesh.
The method of a kind of refining liquid steel the most according to claim 2, it is characterised in that the gas of described winding-up be argon,
Nitrogen, carbon dioxide or natural gas.
The method of a kind of refining liquid steel the most according to claim 2, it is characterised in that the described powder winding-up time according to
Following formula calculates:
In formula, t1For blowing powder operating time, m1For powder addition, β1For powder throughput ratio, ρg1Close for blowing gas
Degree, Qg1For blowing gas volume flow.
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| CN107737907B (en) * | 2017-10-20 | 2019-10-01 | 辽宁科技大学 | Using the uphill casting device and method of blowing nanoparticle and argon gas refinement ingot structure |
| CN109576443B (en) * | 2018-12-29 | 2023-06-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method and device for refining molten steel by bottom slag spraying |
| CN109880965B (en) * | 2019-04-24 | 2020-08-04 | 东北大学 | Device and method for powder injection dephosphorization and simultaneous slag blocking above converter steel tapping hole |
| CN110744016A (en) * | 2019-10-17 | 2020-02-04 | 东北大学 | Device and method for treating molten steel by utilizing rare earth in tundish |
| CN112501391A (en) * | 2020-08-26 | 2021-03-16 | 南京钢铁股份有限公司 | RH refining furnace dynamic powder injection device system and application method thereof |
| CN114959185B (en) * | 2022-05-31 | 2023-01-31 | 东北大学 | Ascending pipe nozzle for strengthening RH refining and blowing method |
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| JPS621814A (en) * | 1985-06-25 | 1987-01-07 | Sumitomo Metal Ind Ltd | Method and apparatus for heating vacuum degassing device |
| JP2003335573A (en) * | 2002-05-22 | 2003-11-25 | Kawasaki Refract Co Ltd | Slit type gas blowing plug |
| CN100370036C (en) * | 2005-12-13 | 2008-02-20 | 东北大学 | Slit type ladle bottom blowing powder injection process and apparatus |
| CN102274958B (en) * | 2011-08-16 | 2013-08-21 | 东北大学 | Frustum slit type anti-blocking ladle bottom-blown powder injection device |
| CN103255266B (en) * | 2013-05-29 | 2014-08-20 | 东北大学 | Bottom powder spraying/vacuum degassing molten steel refining device and method |
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2015
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