CN104561452A - Device and method for single snorkel vacuum degassing refining of molten steel by employing bottom injection - Google Patents

Device and method for single snorkel vacuum degassing refining of molten steel by employing bottom injection Download PDF

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CN104561452A
CN104561452A CN201510022180.8A CN201510022180A CN104561452A CN 104561452 A CN104561452 A CN 104561452A CN 201510022180 A CN201510022180 A CN 201510022180A CN 104561452 A CN104561452 A CN 104561452A
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gas
powder
ladle
molten steel
refining
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CN104561452B (en
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朱苗勇
程中福
娄文涛
郑淑国
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Northeastern University China
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Abstract

The invention belongs to the technical field of steel refining, and particularly relates to a device and a method for single snorkel vacuum degassing refining of molten steel by employing bottom injection. The device disclosed by the invention comprise an air supply system, a powder spray system, a single snorkel vacuum degassing refining furnace, wherein an airflow distributor on the air supply system is branched into three gas circuits which are connected with the powder spray system; a powder airflow delivery pipe in the powder spray system is connected with a bottom powder injection element; the bottom powder injection element is built at the bottom of a ladle furnace of the single snorkel vacuum degassing refining furnace; and an opening is formed in the lower end of a vacuum chamber of the single snorkel refining furnace and is inserted into a steel ladle molten pool. The method for single snorkel vacuum degassing refining of molten steel by employing bottom injection comprises the following steps: firstly, blowing a gas and stirring molten steel; blowing powder into the steel ladle through the bottom powder injection element under the transportation of a carrier gas flow; and after the blowing time is ended, entering the next work circle. The device and the method are easy to achieve, short in production cycle, and high in production capacity; equipment investment and operation costs on an overhead bunker and a wire feeding mechanism are reduced; the technological operation is simple; and energy conservation and emission reduction are facilitated.

Description

Dust the device and method of single mouth vacuum deaeration refining molten steel at a kind of end
Technical field
The invention belongs to Steel Refining technical field, particularly dust the device and method of single mouth vacuum deaeration refining molten steel at a kind of end.
Background technology
In steel refining, the conventional vacuum deaeration refining molten steel method adopted, is combined with vacuum degassing technology by ladle refining, a kind of vacuum processing method of formation.Single-mouth refining furnace is the outer a refining unit of Novel furnace transformed by RH nineteen seventies, it is while remaining the original metallurgical function of RH method, change its two soaking tubs into diameter larger single-dip pipe, the rising soaking tub Argon of RH is changed into the eccentric Argon of ladle bottom simultaneously, after entering argon gas from bag bottom blowing, utilize airlift pump principle to guide molten steel to produce to rise and katabatic drainage stock, and then generation circulates, and remove gas in vacuum chamber.This device, while increase molten steel circular flow, increases Argon Bubble ascending path, makes full use of the stirring capacity of argon gas, improves the affinabilities such as vacuum decarburization, desulfurization, degassed, rapid alloying, specifically has following several respects a little:
(1) refining efficiency is high, the efficient decarburization of energy and effective desulfurization;
(2) structure is simple, and the resistance to material life-span is even, easy to maintenance;
(3) soaking tub end face is large, and molten steel circulation is large;
(4) can be used for low capacity ladle, RH is then difficult to;
(5) argon gas consumption is few, cost-saving;
(6) molten steel splash is low, not easily dross in vacuum chamber.
Single-mouth refining furnace is from proposing the history of existing more than 30 year so far, in the middle of the evolution of these decades, this technology has also carried out constantly groping, derive S-DH, the refining units such as REDA and method, container in REDA equipment has had a tail pipe larger than conventional diameter and vacuum tank no longer does vertical movement, and argon gas is blown into enter internal tank and between internal tank and ladle, form molten steel from ladle bottom and circulates.SUS-REDA(Steel Use Stainless-Revolutionary Degassing Activator) except may be used for smelting suprelow carbon steel, also can be used for stainless smelting, its principal feature is expanded by the sectional area of internal vacuum chamber, as shown in Figure 1, the splash of vacuum deaeration refining process to vacuum chamber top is effectively alleviated.
At present, single mouth stove carries out refining mainly through top lance blowing powder, and single-mouth refining furnace is combined with powder spraying apparatus and carries out desulfurization when going to be mingled with, being using argon gas as carrier, by immersing spray gun, the refining agent of granular being sprayed into molten steel, because spray gun consumes spare unit, price is higher, its life-span is directly connected to the cost of refining treatment technique, and spray gun inserts molten steel just unavoidably will soak with slag contacts generation slag, and scouring is one of the key factor in shortening spray gun work-ing life; Spray gun stroke is certain, and molten steel liquid level but likely changes, and causing spray gun to immerse is not be exactly too shallow too deeply, and impact operates to obtain stability, is unfavorable for production direct motion; And once run into power outage during winding-up, not only spray gun damages, and whole Baogang liquid is all likely scrapped, the submerged lance problem such as the secondary pollution of splash or molten steel also can be brought serious.
Summary of the invention
For the deficiencies in the prior art, the present invention discloses a kind of end and to dust the device and method of single mouth vacuum deaeration refining molten steel, i.e. SSVD-BPI method (Single Snokel Vacuum Degassing-Bottom Powder Injection), by single mouth stove vacuum deaeration refining method and end injection refining are organically combined, be different from traditional single-mouth refining furnace injection refining, object strengthens mixing effect, improve the recovery rate spraying into pulvis, shorten treatment cycle, improve throughput, 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, comprises airing system, powder spraying system, single mouth vacuum degassing refining furnace and the end to dust element;
Wherein said airing system comprises gas-holder and air-flow distributor, gas-holder is connected with air-flow distributor, three gas circuits are separated from air-flow distributor, often prop up in gas circuit and under meter and tensimeter are housed, wherein the first gas circuit is connected with the powder spraying pot of powder spraying system, second gas circuit is connected with the fluidising chamber of powder spraying system, and the 3rd gas circuit is connected with the mixing section of powder spraying system;
Described powder spraying system comprises storage bin, powder spraying pot, fluidising chamber and mixing section, wherein storage bin is positioned at powder spraying pot top, be connected with powder spraying pot by the first baiting valve, powder spraying pot bottom is the fluidising chamber of inverted cone shape, be connected with the top of mixing section by the second baiting valve bottom fluidising chamber, mixing section side is connected with the 3rd gas circuit, and opposite side is connected with powder air delivery tube, and the described powder air delivery tube the other end and the end element that dusts 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, and upper end contacts with molten steel;
Described single-mouth refining furnace comprises ladle, vacuum chamber and exhaust system, and ladle is built with molten steel, and the molten steel bath degree of depth is depending on refining ladle tonnage, vacuum chamber is positioned at ladle top, for single mouth, lower ending opening also inserts ladle molten bath, and vacuum chamber top is connected with exhaust system.
The element that dusts of the described end comprises gas permeable brick and air receiver, gas permeable brick is made up of refractory materials, it is the clearance type gas permeable brick of truncated cone-shaped, be provided with rectilinear slot or annulus above, rectilinear slot with the element central that dusts for arranging radially along element radius direction of dusting in the center of circle, annulus is concentric with the element central that dusts, and rectilinear slot width is 0.08 ~ 0.3mm, and number is 10 ~ 80; Annulus width is 0.08 ~ 0.3mm, and number is 2 ~ 60, and gas permeable brick is run through in gap, and gas permeable brick is surrounded by steel bushing, and lower end to be connected with air receiver by flange or to be directly welded on air receiver.Arrangements of components is dusted for distance 0 ~ 0.7 times, ladle furnace bottom center ladle furnace bottom radius in the end, and number is 1 or 2, symmetrically or asymmetric manner arrange.
Adopt said apparatus to carry out the end to dust the method for single mouth vacuum deaeration refining molten steel, carry out according to following steps:
(1) just furnace tapping, ladle hangs in work parking stall, close the valve of powder spraying system, open the air valve of airing system, gas enters ladle molten bath by the 3rd gas circuit via the clearance type element that dusts, carry out air blowing to molten steel to stir, treat that winding-up is stable, observe ladle molten bath slag circle size, slow decline vacuum chamber, vacuum chamber lower ending opening is inserted ladle molten bath, vacuum chamber adopts single mouth upcast, insert the molten steel degree of depth 200 ~ 600mm, avoid vacuum chamber to contact slag blanket simultaneously, then process is vacuumized to vacuum chamber, reduce blowing gas flow simultaneously, molten steel rises to certain altitude in vacuum chamber,
(2) pulvis is joined powder spraying pot from storage bin, close the first baiting valve, pressurizeed to powder spraying pot by the first gas circuit, by the second gas circuit, preliminary fluidisation is carried out to pulvis simultaneously, when the pressure in fluidising chamber is greater than the 3rd airline pressure, open the second baiting valve, pulvis flow is controlled by the second baiting valve, in fluidising chamber, the pulvis of preliminary fluidisation enters into mixing section, controls the gas flow of the 3rd gas circuit and pressure, and what make powder air-flow safety and stability in mixing section enters powder air delivery tube;
(3) pulvis 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 enters ladle molten bath, and jetting pressure controls at 0.3 ~ 1.5MPa, requires that powder airshed ratio is less than 1 in the middle of winding-up process, treat that the winding-up time terminates, close second time powder valve, close the first gas circuit, close the second gas circuit, slow lifting vacuum chamber, vacuum chamber is improved and departs from ladle molten bath, close the 3rd gas circuit, enter next working cycle.
Described blowing powder is decarburizer, reductor, sweetening agent, dephosphorizing agent and the alloying pulvis applied in existing refinery practice, described alloying pulvis to be the compound of iron be base contains required fine ore, ferromanganese fine ore, ferrochrome fine ore, nickel powder or the rare earth element pulvis adding alloy, wherein said alloying element is manganese, chromium, nickel or rare earth element, and the granularity of pulvis is 200 ~ 800 orders.
The gas of described winding-up is argon gas, nitrogen, carbonic acid gas or Sweet natural gas.
The described pulvis winding-up time calculates according to the following formula:
In formula, t 1 for the blowing powder operating time, m 1 for pulvis add-on, β 1 for powder airshed ratio, ρ g1 for the density of blowing gas, q g1 for blowing gas volumetric flow rate.
Compared with prior art, feature of the present invention and beneficial effect are:
(1) pulvis that the method that the present invention adopts the end to dust single mouth vacuum deaeration refining molten steel sprays into all can incorporate molten steel, utilize whole strokes of the molten steel degree of depth simultaneously, increase the residence time of pulvis in molten steel, improve the utilization ratio of Refining powders, improve the recovery rate of alloy powder, shorten the operating time of single mouth vacuum degassing refining furnace, reduce cost, improve refining efficiency;
(2) the present invention adopts the dust method of single mouth vacuum deaeration refining molten steel of the end to overcome that traditional single mouth vacuum deaeration refining molten steel spray gun easily blocks, work-ing life is short, fluctuation of service, spray gun easily peel off defects such as polluting molten steel, reduce production cost, improve processing safety, improve a steel quality of production, be beneficial to and produce lasting, reliable, stable carrying out, and injection refining process is without splash, reliable and stable;
(3) the present invention adopts the dust method of single mouth vacuum deaeration refining molten steel of the end single mouth vacuum outgas method to be combined with Ladle Bottom injection refining, can realize vacuum decarburization, vacuum outgas, desulfurization, dephosphorization, even molten steel temperature, the function of even molten steel component and removal of inclusions;
(4) the present invention adopts the dust method of single mouth vacuum deaeration refining molten steel of the end to be easy to realize, and with short production cycle, throughput is high, and decrease high hopper, the facility investment of wire feeder structure and operation cost, technological operation is simple, is beneficial to and realizes energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of single mouth vacuum deaeration refining molten steel of dusting at the end of the present invention;
Fig. 2 is the component structure schematic diagram that dusts the end in Fig. 2;
Fig. 3 is the device schematic diagram of SUS-REDA technique in prior art;
Wherein: 1: gas-holder; 2: air valve; 3: air-flow distributor; 4: the first tensimeters; 5: first-class gauge; 6: second gauge; 7: the three under meters; 8: the second tensimeters; 9: the three tensimeters; 10: the four tensimeters; 11: storage bin; 12: the first baiting valves; 13: powder spraying pot; 14: fluidising chamber; 15: the second baiting valves; 16: mixing section; 17: powder air delivery tube; 18: dust element at the end; 19: molten steel; 20: ladle; 21: covering slag; 22: vacuum chamber; 23: exhaust system; 24: spray gun; 25: pipeline; 26: gas cooler; 27: steel bushing; 28: gas permeable brick; 29: dust member slot; 30: joint bolt; 31: dust element air receiver.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
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, comprises airing system, powder spraying system, single mouth vacuum degassing refining furnace and the end to dust element;
Wherein said airing system comprises gas-holder 1 and air-flow distributor 3, gas-holder 1 is connected with air-flow distributor 3, air valve 2 is provided with between gas-holder 1 and air-flow distributor, air-flow distributor 3 is provided with the first tensimeter 4, three gas circuits are separated from air-flow distributor 3, often prop up in gas circuit and under meter and tensimeter are housed, 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 tensimeter 8, second gas circuit is connected with the fluidising chamber 14 of powder spraying system, second gas circuit is provided with second gauge 6 and the 3rd tensimeter 9, 3rd gas circuit is connected with the mixing section 16 of powder spraying system, 3rd gas circuit is provided with the 3rd under meter 7 and the 4th tensimeter 10,
Described powder spraying system comprises storage bin 11, powder spraying pot 13, fluidising chamber 14 and mixing section 16, wherein storage bin 11 is positioned at powder spraying pot 13 top, be 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, be connected with the top of mixing section 16 by the second baiting valve 15 bottom fluidising chamber 14, mixing section 16 side is connected with the 3rd gas circuit, and opposite side is connected with powder air delivery tube 17, and described powder air delivery tube 17 and the end element 18 that dusts 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 bottom ladle furnace, and upper end contacts with molten steel 19;
Described single-mouth refining furnace comprises ladle 20, vacuum chamber 22 and exhaust system 23, ladle is built with molten steel 19, molten steel 19 pool depth is depending on refining ladle tonnage, vacuum chamber 22 is positioned at ladle 20 top, for single mouth, lower ending opening also inserts ladle molten bath, and vacuum chamber 22 top is connected with exhaust system 23.
The element 18 that dusts of the described end comprises gas permeable brick 28 and air receiver 31, gas permeable brick 28 is made up of refractory materials, it is the clearance type gas permeable brick of truncated cone-shaped, be provided with rectilinear slot or annulus above, rectilinear slot with element 18 center of dusting for arranging radially along element radius direction of dusting in the center of circle, annulus is concentric with the element central that dusts, and rectilinear slot width is 0.08 ~ 0.3mm, and number is 10 ~ 80; Annulus width is 0.08 ~ 0.3mm, number is 2 ~ 60, gas permeable brick is run through in gap, be surrounded by steel bushing 27, lower end to be connected with air receiver 31 by flange or to be directly welded on air receiver 31, end original paper 18 number that dusts is 1 or 2, and decoration form is distance 0 ~ 0.7 times, ladle furnace bottom center ladle furnace bottom radius, symmetrically or asymmetric manner arrange.
Adopt said apparatus to carry out the end to dust the method for single mouth vacuum deaeration refining molten steel, carry out according to following steps:
(1) just furnace tapping, ladle 20 hangs in work parking stall, close the valve of powder spraying system, open the air valve 2 of airing system, gas enters ladle molten bath by the 3rd gas circuit via the clearance type element 18 that dusts, carry out air blowing to molten steel 19 to stir, treat that winding-up is stable, observe ladle molten bath slag circle size, slow decline vacuum chamber 22, vacuum chamber 22 lower ending opening is inserted ladle molten bath, vacuum chamber 22 adopts single mouth upcast, insert molten steel 19 degree of depth 200 ~ 600mm, avoid vacuum chamber 22 to contact slag blanket simultaneously, then process is vacuumized to vacuum chamber 22, reduce blowing gas flow simultaneously, molten steel 19 rises to certain altitude in vacuum chamber 22,
(2) pulvis is joined powder spraying pot 13 from storage bin 11, close the first baiting valve 12, pressurizeed to powder spraying pot 13 by the first gas circuit, by the second gas circuit, preliminary fluidisation is carried out to pulvis simultaneously, when pressure in fluidising chamber 14 is greater than the 3rd airline pressure, open the second baiting valve 15, pulvis flow is controlled by the second baiting valve 15, in fluidising chamber 14, the pulvis of preliminary fluidisation enters into mixing section 16, by controlling gas flow and the pressure of the 3rd gas circuit, in guarantee mixing section 16, powder air-flow safety and stability enters powder air delivery tube 17;
(3) pulvis 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 airshed ratio is less than 1 in the middle of winding-up process, treat that the winding-up time terminates, close the second baiting valve 15, close the first gas circuit, close the second gas circuit, slow lifting vacuum chamber 22, vacuum chamber 22 is improved and departs from ladle molten bath, close the 3rd gas circuit, enter next working cycle.
Embodiment 1
Adopt said apparatus, to dust at the bottom of 50t, SSVD-BPI method desulfurization smelting suprelow carbon steel is described, and carrier gases is dry argon gas, and blowing powder is 600 order CaO powder, and powder to air ratio is 0.8, and the winding-up time is 10min.The end element that dusts adopts rectilinear slot formula to dust element, and wavelength width of a slit is 0.18mm, length 20mm, and gap number is 20, and element number of dusting is 1, is arranged in the end to dust single mouth vacuum degassing refining furnace ladle bottom distance bottom centre 0.5 times of radius.It is 300mm that single mouth vacuum degassing 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 carry out according to following steps:
(1) just furnace tapping, the ladle 20 that molten steel is housed is hung in work parking stall, close the valve of powder spraying system, open the air valve 2 of airing system, argon gas enters ladle molten bath by the 3rd gas circuit via the clearance type element 18 that dusts, adjustment airshed is 50L/min, jetting pressure 0.5MPa, carry out air blowing to molten steel 19 to stir, treat that winding-up is stable, observe ladle molten bath slag circle size, slow decline vacuum chamber 22, vacuum chamber 22 lower ending opening is inserted ladle molten bath, vacuum chamber 22 adopts single mouth upcast, insert molten steel 20 degree of depth 300mm, avoid vacuum chamber 22 to contact slag blanket simultaneously, then process is vacuumized to vacuum chamber 22, reduce blowing gas flow to 30L/min simultaneously, molten steel 19 rises to 600mm in vacuum chamber 22,
(2) be that 600 object CaO pulvis join powder spraying pot 13 from storage bin 11 by granularity, close the first baiting valve 12, pressurizeed to powder spraying pot 13 by the first gas circuit, airshed 10L/min, by the second gas circuit, preliminary fluidisation is carried out to pulvis simultaneously, airshed 20L/min, when pressure in fluidising chamber 14 is greater than the 3rd airline pressure, open the second baiting valve 15, pulvis flow is controlled by the second baiting valve 15, in fluidising chamber 14, the pulvis of preliminary fluidisation enters into mixing section 16, by controlling gas flow and the pressure of the 3rd gas circuit, in guarantee mixing section 16, powder air-flow safety and stability enters powder air delivery tube 17,
(3) pulvis 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, jetting pressure controls at 0.5MPa, require in the middle of winding-up process that powder airshed ratio is 0.8, winding-up 10min, treat that the winding-up time terminates, close the second baiting valve 15, close the first gas circuit, close the second gas circuit, slow lifting vacuum chamber 22, vacuum chamber 22 is improved and departs from ladle molten bath, close the 3rd gas circuit, measuring liquid steel temperature makes it control more than steel grade liquidus line 20 DEG C, cast, refining furnace enters next working cycle.

Claims (6)

1. dust at the bottom of the device of single mouth vacuum deaeration refining molten steel, it is characterized in that comprising airing system, powder spraying system, single mouth vacuum degassing refining furnace and the end to dust element;
Wherein said airing system comprises gas-holder and air-flow distributor, gas-holder is connected with air-flow distributor, three gas circuits are separated from air-flow distributor, often prop up in gas circuit and under meter and tensimeter are housed, wherein the first gas circuit is connected with the powder spraying pot of powder spraying system, second gas circuit is connected with the fluidising chamber of powder spraying system, and the 3rd gas circuit is connected with the mixing section of powder spraying system;
Described powder spraying system comprises storage bin, powder spraying pot, fluidising chamber and mixing section, wherein storage bin is positioned at powder spraying pot top, be connected with powder spraying pot by the first baiting valve, powder spraying pot bottom is the fluidising chamber of inverted cone shape, be connected with the top of mixing section by the second baiting valve bottom fluidising chamber, mixing section side is connected with the 3rd gas circuit, and opposite side is connected with powder air delivery tube, and the described powder air delivery tube the other end and the end element that dusts 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, and upper end contacts with molten steel;
Described single mouth vacuum degassing refining furnace comprises ladle, vacuum chamber and exhaust system, and ladle is built with molten steel, and the molten steel bath degree of depth is depending on refining ladle tonnage, vacuum chamber is positioned at ladle top, for single mouth, lower ending opening also inserts ladle molten bath, and vacuum chamber top is connected with exhaust system.
2. dust the device of single mouth vacuum deaeration refining molten steel at a kind of end according to claim 1, it is characterized in that the element that dusts of the described end comprises gas permeable brick and air receiver, wherein gas permeable brick is made up of refractory materials, it is the clearance type gas permeable brick of truncated cone-shaped, be provided with rectilinear slot or annulus above, rectilinear slot with the element central that dusts for arranging radially along element radius direction of dusting in the center of circle, annulus is concentric with the element central that dusts, rectilinear slot width is 0.08 ~ 0.3mm, number is 10 ~ 80, annulus width is 0.08 ~ 0.3mm, number is 2 ~ 60, gas permeable brick is run through in gap, steel bushing is wrapped up outside gas permeable brick, lower end to be connected with air receiver by flange or to be directly welded on air receiver, the end component number that dusts is 1 or 2, decoration form is distance 0 ~ 0.7 times, ladle furnace bottom center ladle furnace bottom radius, symmetrically or asymmetric manner arrange.
3. adopt the end according to claim 1 to dust the method for single mouth vacuum deaeration refining molten steel device refining liquid steel, it is characterized in that carrying out according to following steps:
(1) just furnace tapping, ladle hangs in work parking stall, close the valve of powder spraying system, open the air valve of airing system, gas enters ladle molten bath by the 3rd gas circuit via the clearance type element that dusts, carry out air blowing to molten steel to stir, treat that winding-up is stable, observe ladle molten bath slag circle size, slow decline vacuum chamber, vacuum chamber lower ending opening is inserted ladle molten bath, vacuum chamber adopts single mouth upcast, insert the molten steel degree of depth 200 ~ 600mm, avoid vacuum chamber to contact slag blanket simultaneously, then process is vacuumized to vacuum chamber, reduce blowing gas flow simultaneously, molten steel rises to certain altitude in vacuum chamber,
(2) pulvis is joined powder spraying pot from storage bin, close the first baiting valve, pressurizeed to powder spraying pot by the first gas circuit, by the second gas circuit, preliminary fluidisation is carried out to pulvis simultaneously, when pressure in fluidising chamber is greater than the 3rd airline pressure, open the second baiting valve, pulvis flow is controlled by the second baiting valve, in fluidising chamber, the pulvis of preliminary fluidisation enters into mixing section, by controlling gas flow and the pressure of the 3rd gas circuit, in guarantee mixing section, powder air-flow safety and stability enters powder air delivery tube;
(3) pulvis 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 enters ladle molten bath, and jetting pressure controls at 0.3 ~ 1.5MPa, requires that powder airshed ratio is less than 1 in the middle of winding-up process, treat that the winding-up time terminates, close second time powder valve, close the first gas circuit, close the second gas circuit, slow lifting vacuum chamber, vacuum chamber is improved and departs from ladle molten bath, close the 3rd gas circuit, enter next working cycle.
4. the method for a kind of refining liquid steel according to claim 3, it is characterized in that described blowing powder is decarburizer, reductor, sweetening agent, dephosphorizing agent and the alloying pulvis applied in existing refinery practice, described alloying pulvis to be the compound of iron be base contains required fine ore, ferromanganese fine ore, ferrochrome fine ore, nickel powder or the rare earth element pulvis adding alloy, wherein said alloying element is manganese, chromium, nickel or rare earth element, and the granularity of pulvis is 200 ~ 800 orders.
5. the method for a kind of refining liquid steel according to claim 3, is characterized in that the gas of described winding-up is argon gas, nitrogen, carbonic acid gas or Sweet natural gas.
6. the method for a kind of refining liquid steel according to claim 3, is characterized in that the described pulvis winding-up time calculates according to the following formula:
In formula, t 1 for the blowing powder operating time, m 1 for pulvis add-on, β 1 for powder airshed ratio, ρ g1 for the density of blowing gas, q g1 for blowing gas volumetric flow rate.
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CN107737907A (en) * 2017-10-20 2018-02-27 辽宁科技大学 Using injection nano-particle and the uphill casting device and method of argon gas refinement ingot structure
CN109576443A (en) * 2018-12-29 2019-04-05 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of method and device thereof of bottom spray slag charge refined molten steel
CN109880965A (en) * 2019-04-24 2019-06-14 东北大学 The device and method that a kind of converter taphole top powder dephosphorization realizes pushing off the slag simultaneously
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
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