WO2019054577A1 - 진공 탈가스 설비 및 정련 방법 - Google Patents

진공 탈가스 설비 및 정련 방법 Download PDF

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Publication number
WO2019054577A1
WO2019054577A1 PCT/KR2017/015034 KR2017015034W WO2019054577A1 WO 2019054577 A1 WO2019054577 A1 WO 2019054577A1 KR 2017015034 W KR2017015034 W KR 2017015034W WO 2019054577 A1 WO2019054577 A1 WO 2019054577A1
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Prior art keywords
gas
nozzles
pipe
supplied
nozzle
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PCT/KR2017/015034
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English (en)
French (fr)
Korean (ko)
Inventor
김욱
김성줄
Original Assignee
주식회사 포스코
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Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to JP2020516457A priority Critical patent/JP2020535308A/ja
Priority to CN201780094956.4A priority patent/CN111094598A/zh
Publication of WO2019054577A1 publication Critical patent/WO2019054577A1/ko

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • F27D2007/066—Vacuum

Definitions

  • the present invention relates to a vacuum degassing apparatus and a refining method, and more particularly, to a vacuum degassing apparatus capable of improving inclusion removing efficiency and a refining method using the same.
  • the reflux type vacuum degassing apparatus is a device for degassing and finely adjusting the composition and temperature of molten steel introduced from a converter. Molten steel is degassed in a reflux vacuum degassing plant and produced as high-quality refined steel.
  • a reflux type vacuum degassing apparatus is provided on the upper side of a ladle and ladle containing molten steel and is used for degassing the molten steel.
  • the pair of submerged tubes includes a riser pipe and a downcomer pipe, and the riser pipe is provided with a plurality of nozzles on the inner wall thereof.
  • the ladle containing the molten steel to be refined is transported to the lower side of the vacuum chamber, the pair of the deposition pipes is immersed in the molten steel, and the molten steel of the ladle is introduced into the vacuum chamber by depressurizing the inside of the vacuum chamber. Thereafter, reflux gas is injected into the uprising pipe through the plurality of nozzles.
  • a series of circulating flows such as reflux
  • the molten steel flows into the vacuum vessel through the riser and the molten steel in the vacuum vessel returns to the ladle through the downcomer.
  • the molten steel is degassed in the vacuum chamber, and the components and the temperature of the molten steel are finely adjusted.
  • the above-described process of forming reflux and degassing molten steel is largely divided into a degassing section and a reflux section.
  • the carbon in the molten steel is removed during the degassing period and the deoxidation material having the aluminum component is injected into the molten steel at the end of the degassing period to remove oxygen in the molten steel as an inclusion form in the reflux section.
  • the inclusions collide with each other in the molten steel, grow to a predetermined size, float and separate, and can be collected in the slag in the upper part of the ladle.
  • the removal of the inclusions is based on the incorporation and growth behavior of the inclusions. That is, the inclusions can be coalesced and floated and separated from the molten steel after the particle size has grown to a predetermined size. At this time, due to the high interfacial energy with the molten steel, inclusions are easy to coalesce with each other, which is based on collision between particles. That is, the inclusions are required to collide with each other for mutual coalescence, and can not coalesce and grow up without mutual collision.
  • the molten steel In order to cause collision between inclusion particles in the reflux section, the molten steel must be agitated. The only method for this is to form reflux of molten steel. At this time, as the circulation flow speed becomes higher, the turbulence is strengthened and the molten steel is stirred well, and the chance of mutual collision of the inclusions in the molten steel is increased. That is, in order to increase the removal efficiency of the inclusions in the refining process of the molten steel using the reflux type vacuum degassing apparatus, the flow rate of the molten steel should be increased.
  • Patent Document 1 KR10-0723376 B1
  • the present invention provides a vacuum degassing apparatus and refining method capable of increasing turbulence in an uprising pipe without changing the total amount of reflux gas injected into the uprising pipe.
  • the present invention provides a vacuum degassing apparatus and refining method capable of enhancing inclusion removal efficiency by increasing turbulence in an uprising pipe.
  • a vacuum degassing apparatus includes: a vacuum tank having a space capable of being depressurized therein; A plurality of submerged tubes mounted on a lower portion of the vacuum chamber and communicating with the vacuum chamber, the plurality of submerged tubes being capable of being immersed in a treatment substance in a vessel disposed below the vacuum chamber; A plurality of nozzles installed on an inner wall of one of the deposition tubes; A gas supplier connected to the plurality of nozzles to supply gas; And a controller for controlling the gas supplier such that the gas supplier supplies gas to the plurality of nozzles asymmetrically.
  • the controller can control the gas supplier so that the amount of gas supplied to at least one nozzle or at least one nozzle group can be controlled independently while maintaining the total amount of gas supplied to the plurality of nozzles.
  • the plurality of nozzles are arranged in a circumferential direction and connected to the gas supply unit individually or group by group, and the controller controls the amount of gas supplied to some of the nozzles or a part of the nozzle groups, The gas supply can be controlled.
  • the plurality of submerged tubes may include a riser pipe and a downfalling pipe.
  • the inner wall of the riser pipe may be divided into a plurality of chambers. At least one or more of the plurality of nozzles may be installed in each of the chambers, As shown in FIG.
  • the plurality of partial surfaces may be divided into circumferentially spaced inner circumferential walls of the uprising pipe and extending in the vertical direction.
  • the area lines are spaced apart at intervals of 90 degrees to divide the inner wall of the uprising pipe, and the controller can control the supply of 40% to 50% of the total amount of the gas to a nozzle group installed on one surface.
  • the controller can control to uniformly classify 50% to 60% of the total amount of the gas to nozzle groups respectively installed on the remaining partial surfaces.
  • the controller may control the nozzle groups to be supplied from 40% to 50% of the total amount of the gas to change periodically or continuously.
  • a refining method is a refining method comprising the steps of placing a container in which a treated material is taken under a vacuum tank; Depositing a plurality of submerged tubes connected to the vacuum chamber in the treated material; A step of reducing the pressure of the inside of the vacuum chamber and refluxing the treated material by supplying a gas into one of the deposition tubes; And controlling the gas supply so as to supply the gas asymmetrically to the inside of any one of the deposition tubes.
  • the step of controlling the supply of the gas includes the steps of: maintaining a total amount of gas supplied to a plurality of nozzles spaced in the circumferential direction on the inner wall of the uprising pipe; And independently controlling the amount of gas supplied to at least one nozzle or at least one nozzle group.
  • the process of controlling the amount of gas independently includes the steps of supplying a high flow rate gas to a part of the nozzles or a part of the nozzle groups; And supplying a low flow rate gas to the remaining nozzles or the remaining nozzle groups.
  • the step of independently controlling the amount of gas may be performed by dividing the inner wall of the uprising pipe into a plurality of bifurcated surfaces and arranging one or a plurality of nozzles provided for each bifurcated surface as the respective nozzle groups independently of the amount of the gas supplied to the at least one nozzle group .
  • the plurality of partial surfaces are separated from the inner wall of the uprising pipe in the circumferential direction and divided by the area lines extending in the vertical direction, and are divided into first, second, third, ,
  • the step of independently increasing or decreasing the amount of gas may include supplying 40% to 50% of the total amount of the gas to the nozzle group installed on any one of the plurality of partial surfaces.
  • the step of independently increasing or decreasing the amount of gas may include a step of evenly classifying 50% to 60% of the total amount of the gas to nozzle groups respectively installed on the remaining surfaces except the one surface.
  • the process of independently increasing or decreasing the amount of gas may include periodically or continuously changing a nozzle group to which 40% to 50% of the total amount of the gas is supplied.
  • the turbulence in the riser can be increased without changing the total amount of the reflux gas injected into the riser, and the inclusion removal efficiency in the process water circulating in the facility can be improved.
  • the cleanliness of the treated product can be improved.
  • the inside of the riser is divided into a plurality of sections divided radially and reflux gas is supplied into the riser,
  • the flow rate of the reflux gas can be independently controlled for each of the plurality of sections without changing the total amount of the gas, and the reflux gas can be supplied asymmetrically to the inside of the uprising pipe to disturb the molten steel flow.
  • turbulence indexes such as turbulent energy and turbulent dissipation rate in the molten steel flow can be improved, and the possibility that the inclusions in the molten steel may collide with each other can be improved. Accordingly, the inclusions can coalesce and grow in the molten steel to accelerate the inclusion and separation of the inclusions, and the inclusion removal effect can be enhanced. Therefore, the cleanliness of the molten steel can be improved.
  • FIG. 1 is a schematic view of a vacuum degassing apparatus according to an embodiment of the present invention.
  • FIG. 2 is a horizontal sectional view of a vacuum degassing apparatus according to an embodiment of the present invention.
  • 3 to 5 are views for explaining the results of the flow analysis according to the experimental examples of the present invention.
  • FIGS. 6 and 7 are tables for explaining the flow analysis conditions and results of the molten steel according to the experimental examples of the present invention.
  • the present invention can be applied to an apparatus for refluxing various melts and treating them in various ways.
  • the embodiment of the present invention will be described on the basis of a vacuum degassing apparatus used for degassing refining of molten steel in a steelworks.
  • FIG. 1 is a schematic view of a vacuum degassing apparatus according to an embodiment of the present invention
  • FIG. 2 is a horizontal sectional view showing a main part of a vacuum degassing apparatus according to an embodiment of the present invention.
  • a vacuum degassing apparatus includes a vacuum tank 100 disposed at an upper portion of a container 700 and having a space capable of being depressurized therein, A plurality of submerged tubes 400 mounted in the vacuum chamber 100 and communicating with the interior of the vacuum chamber 100 and capable of being immersed in the processed material M in the vessel 700 disposed below the vacuum chamber 100, A plurality of nozzles 511 installed on the inner wall of the nozzle 400 and a gas supplier 520 connected to the plurality of nozzles 511 and capable of supplying gas and a gas supplier 520 are connected to the plurality of nozzles 511 And a controller 600 connected to the gas supplier 520 for controlling the gas supplier 520 so as to supply the asymmetric gas.
  • the treated material M can be accommodated in a vacuum degassing facility and circulated in the facility.
  • the circulation within the facility means the circulation of the treatment water between the vacuum tank and the vessel of the facility.
  • the treated material (M) may include molten steel that has undergone the electrolytic refining process and undergoing the secondary refining process.
  • the treated material M may contain various melts in addition to molten steel.
  • the vacuum chamber 100 may have a pressure-reducible space therein to remove impurities or gas contained in the processing product M in the container 700.
  • the lance 200 may be inserted through the upper portion of the vacuum chamber 100 and installed therein.
  • a container 700 may be disposed below the vacuum chamber 100. The height of the vacuum chamber 100 or the container 700 is adjusted so that the upper portion of the container 700 surrounds the lower portion of the vacuum chamber 100 so that the lower portion of the vacuum chamber 100 can be inserted into the upper portion of the container 700 have.
  • the vacuum chamber 100 may be connected to a vacuum pump, and the interior of the vacuum chamber 100 may be depressurized using a vacuum pump.
  • the vacuum chamber 100 may be an RH vessel.
  • the vacuum chamber 100 may include an upper chamber 110 and a lower chamber 120 and the upper chamber 110 and the lower chamber 120 may be vertically coupled to each other.
  • the upper tank 110 has a space capable of being depressurized therein, and the lower portion thereof can be opened. And the lance 200 may be inserted through the upper portion of the upper tank 110 to be installed therein.
  • the upper tank 110 may have an inlet 110a, a discharge passage 110b, and a sampler passage 110c on the outer wall.
  • the input for adjusting the component of the processed product M can be input to the inlet 110a and the gas removed from the treated product M in the reduced pressure atmosphere can be discharged from the discharge passage 110b and the sampler passage 110c A sample of the treated material M can be collected.
  • the lower tank 120 has an inner space through which the processed material M can pass, and the upper and lower portions can be opened.
  • the lower tank 120 may be connected to a lower portion of the upper tank 110.
  • the treated material M can be refluxed into the interior of the lower tank 120 and degassed.
  • a plurality of submerged pipes 400 may be connected to the lower portion of the lower tank 120.
  • a plurality of reflux pipes 300 may be mounted by connecting a lower portion of the vacuum chamber 100 and a plurality of submerged pipes 400.
  • the plurality of reflux pipes 300 may be spaced apart from each other in the horizontal direction and may be respectively installed under the vacuum chamber 100 and communicate with the interior of the vacuum chamber 100.
  • the plurality of reflux pipes 300 may include a first reflux pipe 300a and a second reflux pipe 300b. At this time, the first reflux pipe 300a may be the upper portion of the riser pipe, and the second reflux pipe 300b may be the upper portion of the downcomer pipe.
  • the plurality of submerged tubes 400 may be mounted to the lower portion of the vacuum chamber 100 through a plurality of reflux tubes 300.
  • the plurality of submerged pipes 400 are spaced apart from each other in the horizontal direction and can be respectively installed under the plurality of the submerged pipes 300.
  • the submerged pipes 400 are connected to the inside of the plurality of the reflux pipes 300, As shown in Fig.
  • the plurality of submerged pipes 400 may be formed so as to be respectively immersible in the processed material 700 in the container 700 conveyed below the vacuum chamber 100.
  • the plurality of submerged pipes 400 may include a first submerged pipe 400a and a second submerged pipe 400b.
  • the first submerged pipe 400a may be under the uprising pipe
  • the second submerged pipe 400b may be under the downpipe.
  • the upper end of the first submerged pipe 400a may be connected to the lower end of the first reflux pipe 300a and the upper end of the second submerged pipe 400b may be connected to the lower end of the second reflux pipe 300b.
  • the first reflux pipe 300a and the first reflux pipe 400a form upper and lower portions of the uprising pipe and the second reflux pipe 300b and the second dipper pipe 400b form upper and lower portions of the downfall pipe.
  • the processed product M in the container 700 rises through the ascending pipe and the processed product M in the vacuum chamber 100 can descend through the descending pipe.
  • the uprising pipe and the downfalling pipe serve as a passage for the reflux of the treated product (M).
  • the plurality of nozzles 511 may be installed through the inner wall of one of the plurality of submerged pipes 400.
  • a plurality of nozzles 511 may be installed radially through the inner wall of the first deposition pipe 400a.
  • the plurality of nozzles 511 may be connected to the gas supplier 520 through a gas supply pipe 530.
  • the controller 600 may be connected to the gas supplier 520. When the gas supplier 520 supplies gas to the gas supply pipe 530 under the control of the controller 600, the gas is classified into the plurality of nozzles 511 connected to the gas supply pipe 530, So that kinetic energy can be given.
  • the plurality of nozzles 511 may be arranged in the circumferential direction on the inner wall of the first deposition pipe 400a.
  • the plurality of nozzles 511 may be spaced equally. Of course, the plurality of nozzles 511 may have different intervals between the nozzles.
  • the plurality of nozzles 511 may be individually connected to the gas supplier 520 through a plurality of gas supply pipes 530 or may be connected to each other in groups.
  • the controller 600 controls the gas supplier 520 such that the amount of gas supplied to some of the plurality of nozzles 511 or some of the nozzle groups is different from the amount of gas supplied to the remaining nozzles or the remaining nozzle groups. That is, the controller 600 controls the gas supplier 520 such that the amount of gas supplied to some of the plurality of nozzles 511 is different from the amount of gas supplied to the remaining nozzles. Alternatively, the controller 600 controls the gas supplier 520 such that the amount of gas supplied to some nozzle groups of the plurality of nozzles 511 is different from the amount of gas supplied to the remaining nozzle groups.
  • the controller 600 controls the gas supplier 520 such that a relatively high flow rate gas is supplied to some nozzles or some nozzle groups and a relatively low flow rate gas is supplied to the remaining nozzles or the remaining nozzle groups.
  • the number of nozzles to which a relatively high flow rate gas is supplied may be smaller than the number of nozzles to which a relatively low flow rate gas is supplied.
  • the area of the inner wall of the first submerged pipe 400a occupied by the nozzle group to which the gas with a relatively high flow rate is supplied, or the area of the inner wall of the first submerged pipe 400a occupied by the nozzle group May be less than the area or the area of the inner wall.
  • the plurality of nozzles 511 can asymmetrically supply gas into the uprising pipe.
  • asymmetric may mean rotational asymmetry in the circumferential direction around the central axis in the up-down direction of the uprising pipe. That is, the gas is supplied so that at least one of the plurality of nozzles 511 spaced in the circumferential direction and facing each other in the horizontal direction with the vertical axis of the uprising pipe therebetween, This is an asymmetric supply of gas.
  • the container 700 may include ladders.
  • the container 700 is formed with a space in which the processing material M can be received, and the upper portion thereof can be opened.
  • the treated material M is received in the vessel 700 and then transported to the lower side of the vacuum vessel 100 and the elevation of the vacuum vessel 100 or the vessel 700 is controlled, And immersed in water (M). Thereafter, the inside of the vacuum chamber 100 is depressurized to introduce the processed product M into the uprising pipe and the downfalling pipe and the inside of the vacuum chamber 100, while using a plurality of nozzles 511, Gas is injected. At this time, various inert gases including argon gas can be used as the reflux gas.
  • aluminum as a deoxidizing element is charged into the treated product M as a deagglomerated product.
  • the de-oxidation material reacts with oxygen in the treated material (M) to remove oxygen in the treated material (M) in such a manner as to produce aluminum oxide inclusions.
  • the inclusions can coalesce and grow due to the interdigitated particles in the treated product M and the inclusions grown up to a predetermined size are floated by the buoyancy to cause slag floating in the upper surface of the treated product M in the container 100 Can be captured.
  • it is necessary to reflux the treated material (M) at a high speed to form turbulent flow, and collide the particles of the inclusions with turbulence.
  • the turbulent flow component in the treated product M can be increased while maintaining the total amount (total flow rate) of the gas injected into the riser.
  • a plurality of nozzles 511, a connection structure of the gas supply pipe 530 and the gas supply unit 520 to increase the turbulent flow component in the processed product M while maintaining the total amount (total flow rate) Is configured as follows.
  • the inner wall of the lower portion of the uprising pipe may be divided into a plurality of sections. That is, the inner wall of the first submerged pipe 400a may be divided into a plurality of sub-surfaces.
  • the plurality of partial surfaces may be separated by area lines (not shown) extending in the up and down direction in the circumferential direction on the inner wall of the uprising pipe. At this time, the area lines are spaced apart from each other at intervals of 90 degrees around the center axis (not shown) of the uprising pipe so that the inner wall of the uprising pipe is divided into four, for example,
  • the first and second quadrants S1, S2, S3, and S4 may be formed. Of course, the number of divisions and the number of divisions may vary.
  • the dividing method may be various such as dividing, truncating, and dividing, and accordingly, the number of dividing surfaces may vary.
  • each of the bifurcations may have different areas.
  • the area lines may be spaced at different intervals within a certain angular range.
  • the area lines may have different spacings within a predetermined angular range of greater than or less than 90 [deg.].
  • At least one or more nozzles 510 may be spaced apart in the circumferential direction, and at least one or more nozzles may be installed on each of the first and second nozzles 510 to form a plurality of nozzle groups 510 .
  • nozzles are installed on one side. For example, from the first nozzle S1 to the first nozzle S1 in the order from the first nozzle # 1 to the seventh nozzle # 7 from the second nozzle S2 in order, The nozzles are sequentially arranged from the nozzle # 13 and the nineteenth nozzles # 19 are sequentially installed in the fourth sub-surface S4.
  • the number of nozzles in each sub-plane may be varied.
  • a plurality of distribution pipes 512 may be installed in each of the first and second nozzle groups so as to bundle the nozzles provided in each of the first and second nozzle groups with each nozzle group.
  • a plurality of distribution pipes 512 may be installed in each of the partial planes and connected to the nozzles in each of the partial planes in such a manner that one minute piping is installed on one plane and connected to the nozzles in one plane.
  • a plurality of gas supply pipes 530 may be provided to connect each of the distribution pipes and the gas supply device 520, or a rising end of one gas supply pipe 530 may be branched into a plurality of branch pipes.
  • the gas supply unit 520 is connected to a plurality of nozzle groups through a plurality of gas supply pipes 530 to supply the plurality of nozzles 511 with gas. At this time, the supply of gas to each nozzle group can be adjusted. Its operation can be controlled by the controller 600.
  • the controller 600 supplies the nozzle group installed at least one side of the uprising pipe while maintaining the total amount (total flow rate) of the gas injected into the uprising pipe It is possible to control so that the supply flow rate of the gas is different from the supply flow rate of the gas supplied to the nozzle group provided at least on the other one surface. That is, the gas can be controlled to be asymmetrically supplied to the uprising pipe.
  • the controller 600 may control the gas supplier 520 to independently adjust the amount of gas supplied to at least one nozzle or at least one nozzle group while maintaining the total amount of gas supplied to the plurality of nozzles 511 .
  • the controller 600 has an asymmetric blowing pattern of reflux gas to effectively remove inclusions such as deoxidation inclusions.
  • the controller 600 controls the operation of the gas supplier 520 using the asymmetric blowing pattern of the reflux gas, the turbulent flow component in the uprising pipe can be maintained while maintaining the total amount (total flow rate) Can be increased. Therefore, the frequency of collision of the inclusions increases and the growth can be promoted, so that the inclusion and separation of the inclusions can be smoothly performed.
  • the total amount of the gas is maintained, the acceleration of the refractory erosion on the inner wall of the uprising pipe can be suppressed or prevented.
  • the controller 600 controls the nozzle groups installed on one surface to supply 40% to 50% of the total amount of gas, while 50% to 60% of the total amount of gas is uniformly distributed to the nozzle groups installed on the remaining surfaces
  • the gas supplier 520 can be controlled.
  • controller 600 may control the gas supplier 520 such that the nozzle groups to which 40% to 50% of the total amount of gas are supplied are periodically or continuously changed.
  • controller 600 may further have asymmetric blown patterns of various reflux gases in addition to the above control scheme.
  • the controller 600 controls the gas supply unit 520, the gas is supplied asymmetrically to the plurality of nozzles 511 while maintaining the total amount (total flow rate) of the gas injected into the riser pipe, Can be increased.
  • the reflux speed and the reflux amount of the processed product M are determined according to the gas flow rate blown into the processed product M from the plurality of nozzles 511.
  • the collision and growth of inclusions due to turbulent flow formation during the degassing efficiency and the treatment material (M) flow can be increased.
  • the nozzles in one group can be supplied with the same amount of gas, but it is not particularly limited thereto.
  • the refining method according to the embodiment of the present invention includes a process of placing the container 700 in which the processed product M is taken on the lower side of the vacuum chamber 100, The process of immersing the processing solution M in the processing vessel M by depressurizing the interior of the vacuum vessel 100 and supplying the gas to the interior of one of the submerging tubes to reflux the treated material M, And controlling the gas supply so as to supply the gas asymmetrically to the inside of the pipe.
  • the vessel 700 in which the treated material M is taken is provided, and the vessel 700 is positioned below the vacuum vessel 100. Thereafter, the vessel 700 is raised or the vacuum vessel 100 is lowered to immerse the plurality of submerged tubes 400 mounted on the lower portion of the vacuum vessel 100 in the treated material M. This process can be referred to as a coupling process of the container 700 and the vacuum chamber 100.
  • the inside of the vacuum chamber 100 is depressurized and gas is supplied to the inside of any one of the submerged tubes to reflux the treated material M.
  • gas is supplied into the first deposition pipe 400a to reflux the treated product M.
  • the gas is asymmetrically introduced into one of the deposition pipes, for example, the first deposition pipe 400a
  • the controller 600 controls the supply of the gas to the plurality of nozzles 511 by the gas supplier 520 so as to supply the gas to the plurality of nozzles 511.
  • the gas component can be removed from the treated product M by performing a process of refluxing the treated product M and during this process a process of controlling the gas supply is performed to increase the turbulent component in the treated product M
  • the growth rate of inclusions in the treated product M can be improved.
  • the inside of the vacuum chamber 100 can be depressurized to a low pressure of, for example, 2 torr or less.
  • the gas to be removed from the processed product M for example, molten steel, may include carbon monoxide, hydrogen and nitrogen gas.
  • the first submerged pipe 400a is referred to as a lower submerged pipe, and the first submerged pipe 400a is referred to as a lower submerged pipe. Quot;
  • the amount of gas supplied to at least one nozzle or at least one nozzle group can be controlled independently while maintaining the total amount of gas supplied to the plurality of nozzles 411 spaced in the circumferential direction on the inner wall of the uprising pipe do.
  • the nozzles to which high-flow-rate gases are supplied are grouped together in the circumferential direction to form one nozzle group, and the nozzles to which low-flow-rate gases are supplied are grouped together in the circumferential direction to form one or more nozzle groups.
  • the area or the number of the inner surfaces of the uprising pipe occupied by the nozzle group to which the high flow rate gas is supplied may be smaller than the area or the number of the inner surface of the uprising pipe occupied by the nozzle group to which the low flow rate gas is supplied.
  • the inner wall of the uprising pipe is divided into a plurality of sections, and one or a plurality of nozzles provided in each of the sections are used as respective nozzle groups to increase or decrease the amount of gas supplied to at least one nozzle group So that the reflux gas can be supplied asymmetrically with respect to the center axis or with respect to the center axis in the uprising pipe.
  • the plurality of partial surfaces are separated by the area lines extending in the vertical direction and separated from each other in the circumferential direction by the inner wall of the uprising pipe, and the first and second partial surfaces S1, S2, A second face S3 and a fourth face S4.
  • correspondence means that area and shape are the same.
  • the method of independently increasing and decreasing the gas amount is a method in which 40% to 50% of the total amount of the gas is supplied to the nozzle groups provided on any one of the plurality of partial surfaces, while the gas groups And 50% to 60% of the total amount may be uniformly classified.
  • the nozzle groups installed in the second quadrant S2 to the fourth quadrant S4 are respectively supplied with 20 % Reflux gas is supplied so that the sum of the gas amounts supplied to the nozzle groups provided in the second to fourth quadrants S2 to S4 becomes 60% of the total gas amount.
  • the nozzle groups to which 40% to 50% of the total gas amount is supplied can be changed periodically or continuously to prevent the refractory erosion on the inner wall of the ascending tube from being concentrated on the predetermined portion. That is, each of the nozzle groups installed in the first to fourth quadrants S1 to S4 alternately or randomly alternately injects 40 to 50% of the total amount of gas into the riser pipe. At this time, the change time of the gas supply amount may be several to several tens of seconds.
  • the nozzle groups provided on the remaining surfaces except for one of the above- It is not possible to enlarge the vortex area as much as desired in the upper zone of the riser.
  • the vacuum tank 100 can be separated from the container 700 and the container 700 can be carried to the facility for the subsequent process.
  • the inner wall of the uprising pipe is divided into four partial surfaces, and the nozzle groups of the respective partial surfaces are separately or independently controlled, and the reflux gas is blown into the uprising pipe in an asymmetrical pattern
  • the flow in the riser can be disturbed to enhance the turbulence in the treated material M.
  • the supply pattern of the reflux gas can be increased by an asymmetrical reflux gas supply realized by dividing the inside of the uprising pipe radially into four regions, for example, by controlling each region at an independent flow rate without increasing the total amount of the reflux gas.
  • Turbulent flow indicators such as turbulent energy and turbulent dissipation rate can be improved by disturbing the flow of molten steel in the pipe. This increases the chance that the inclusions in the molten steel passing through the riser pipe collide with each other and coalesce to grow, accelerating the rise and separation of the inclusions, and further improve the cleanliness of the molten steel.
  • FIGS. 3 and 4 are views for explaining the flow analysis results of molten steel according to the experimental examples of the present invention.
  • 3 (a) is a view showing a modeling shape of a facility for a flow analysis
  • FIG. 3 (b) is a view showing a result of a flow analysis with a modeled facility.
  • Fig. 3 (c) is a diagram showing the result of vector analysis of the result of Fig. 3 (b).
  • a in Fig. 3 refers to the front surface
  • B refers to the rising observation side.
  • 3 is a view for the first experimental example (Case 1) to be described later.
  • the first experimental example (Case 1) corresponds to a conventional refining process using a conventional vacuum degassing facility.
  • the first experimental example (Case 1) is referred to as a comparative example of the present invention.
  • Fig. 4 (a) is a view showing a modeling shape of a facility for flow analysis
  • Fig. 4 (b) is a view showing a result of flow analysis with a modeled facility
  • 4 (c) is a diagram showing the result of vector analysis of the result of FIG. 4 (b).
  • A refers to the front
  • B refers to the rising observation side.
  • 4 is a view for the fifth experimental example (Case 5) described later.
  • the fifth experimental example (Case 5) corresponds to the embodiment of the present invention.
  • 5 (a) shows a plan view of an analysis result corresponding to FIG. 3 (b) and FIG. 4 (b) in contrast to the plan view on the left side of FIG. 3 And the plan view on the right side is the commentary result corresponding to Fig. 4 (b).
  • 5 (b) is a plan view showing the results of FIG. 5 (a) as a vector analysis.
  • FIG. 6 is a table for explaining the flow analysis conditions of molten steel according to the experimental examples of the present invention.
  • the first case (Case 1) as a reference is an analysis condition for the comparative example.
  • each of the gates is divided into Case 1 to Case 6.
  • each case is referred to as first to sixth experimental examples.
  • 7 is a table for explaining the flow analysis results of molten steel according to the experimental examples of the present invention.
  • a first experimental example (Case 1) is under the conditions that are equal to the reflux gas supplied at a flow rate of 40Nm 3 / hr control the total reflux gas feed rate to 160Nm 3 / hr of the four quadrants, in order to simulate the traditional degassing step the molten steel
  • the flow was numerically analyzed and the results of the flow analysis were derived.
  • the second experimental example (Case 2) and the third experimental example (Case 3) are the result of numerical analysis in which the reflux gas is symmetrically supplied in order to simulate the process different from the conventional example.
  • Each experimental examples are supplied for each gas in the two quadrants to but all the gas total control to 160Nm 3 / hr, facing each other of the four quadrants, with a high flow rate of 50Nm 3 / hr and 60Nm 3 / hr, respectively, in the other two quadrants
  • Analysis by supplying a gas at a low flow rate of 30Nm 3 / hr and 20Nm 3 / hr figures the molten steel flow, which was derived the flow analysis result.
  • the fourth experimental example (Case 4) and the sixth experimental example (Case 6) are the result of numerical analysis of the molten steel flow by simulating the degassing process so as to approach the embodiment, and the fifth experimental example (Case 5)
  • the molten steel flow was numerically analyzed under the conditions according to the examples and the flow analysis results were derived.
  • the gas supply conditions of these experimental examples are as shown in Fig.
  • the molten steel which has risen to the storage tank through the ascending pipe is mostly moved in the vertical direction, but it is converted to the direction toward the downfalling pipe at the portion connected to the ascending pipe near the lower portion of the storage tank.
  • a vortex is generated in a part of the entire reflux section of the molten steel.
  • the molten steel flows collide with each other and the turbulent energy increases.
  • inclusions in the molten steel also increase in collision probability, thereby increasing the volume by coalescence after collision, and floating and separating into slag located in the upper part of the molten steel by buoyancy.
  • the flow analysis results of the fifth experimental example (Case 5) in which the turbulence intensity, the turbulent energy and the turbulent dissipation rate are high show that the vortex region is enlarged in the upper region of the riser. Also, as can be seen from FIG. 5, in the case of the fifth experimental example, it can be expected that even in the flow of the molten steel in the vacuum tank, a collision zone of the molten steel flow occurs on the upper part of the downfalling pipe, and further collision of the inclusions is possible.
  • This optimal turbulence-enhanced reflux pattern provides a flow rate of 40% to 50% of the total flow rate on one of four quadrants and a flow rate of one quadrant of the total flow on the remaining three quadrants And changing the quadrant for supplying the high flow rate of 40% to 50% of the total flow rate with a cycle of about 10 to 60 seconds.
  • a flow rate of 40% to 50% of the total flow rate on one of four quadrants and a flow rate of one quadrant of the total flow on the remaining three quadrants
  • changing the quadrant for supplying the high flow rate of 40% to 50% of the total flow rate with a cycle of about 10 to 60 seconds.
  • a turbulent tempered reflux method for effective removal of deoxidation products during reflux operation using an alumite vessel is required and this should be considered in a range that does not increase the reflux gas flow rate in order to secure the life of the refractory.
  • the turbulence can be effectively increased by asymmetrically supplying the gas.
  • the flow of the molten steel rising along the riser is controlled by controlling the flow rate of the reflux gas, It is possible to give disturbance to the user.
  • asymmetrical reflux gas supply can be achieved by grouping the nozzles in the uprising pipe into four nozzle groups, arranging each group in each quadrant, and controlling the flow rate of the reflux gas supplied from each quadrant by controlling each group independently And the turbulent stirring is strengthened in the molten steel flow, thereby increasing the chance of collision between the inclusions.
  • the reflux gas when the reflux gas is uniformly or symmetrically injected into the uprising pipe, the mutual collision of the inclusions is dominant, so that the incorporation and growth of the inclusions can be performed more easily. Further, since the total amount of the reflux gas is not increased in the enhancement of the turbulence but is maintained as it is in the prior art, the lifetime of the refractory of the riser can be secured.

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  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
PCT/KR2017/015034 2017-09-18 2017-12-19 진공 탈가스 설비 및 정련 방법 WO2019054577A1 (ko)

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JPS63143216A (ja) * 1986-12-05 1988-06-15 Nippon Steel Corp 極低炭素・低窒素鋼の溶製方法
JPH0280507A (ja) * 1988-09-16 1990-03-20 Nippon Steel Corp 真空脱ガス装置の浸漬管
KR910008144B1 (ko) * 1987-06-29 1991-10-10 가와사끼세이데쓰 가부시끼가이샤 Rh 방법을 이용하는 용융금속의 탈가스 방법 및 장치
JPH07300615A (ja) * 1994-04-27 1995-11-14 Kawasaki Steel Corp Ｒｈ式真空脱ガス装置を用いる溶鋼の脱硫方法
KR20020037973A (ko) * 2000-11-16 2002-05-23 이구택 환류량을 높인 진공 탈가스 설비의 침적관

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KR100723376B1 (ko) 2005-12-29 2007-05-30 주식회사 포스코 진공 탈가스 장치
CN102146502A (zh) * 2010-02-05 2011-08-10 鞍钢股份有限公司 一种rh纯净钢冶炼及深脱碳工艺
CN201793627U (zh) * 2010-08-06 2011-04-13 武汉钢铁(集团)公司 一种用于rh精炼炉上升管的供气装置
CN205774651U (zh) * 2016-05-26 2016-12-07 中冶南方工程技术有限公司 Rh提升气体阀站

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Publication number Priority date Publication date Assignee Title
JPS63143216A (ja) * 1986-12-05 1988-06-15 Nippon Steel Corp 極低炭素・低窒素鋼の溶製方法
KR910008144B1 (ko) * 1987-06-29 1991-10-10 가와사끼세이데쓰 가부시끼가이샤 Rh 방법을 이용하는 용융금속의 탈가스 방법 및 장치
JPH0280507A (ja) * 1988-09-16 1990-03-20 Nippon Steel Corp 真空脱ガス装置の浸漬管
JPH07300615A (ja) * 1994-04-27 1995-11-14 Kawasaki Steel Corp Ｒｈ式真空脱ガス装置を用いる溶鋼の脱硫方法
KR20020037973A (ko) * 2000-11-16 2002-05-23 이구택 환류량을 높인 진공 탈가스 설비의 침적관

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