CN114959185A - Ascending pipe nozzle for strengthening RH refining and blowing method - Google Patents

Ascending pipe nozzle for strengthening RH refining and blowing method Download PDF

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Publication number
CN114959185A
CN114959185A CN202210604844.1A CN202210604844A CN114959185A CN 114959185 A CN114959185 A CN 114959185A CN 202210604844 A CN202210604844 A CN 202210604844A CN 114959185 A CN114959185 A CN 114959185A
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nozzle
refining
ascending pipe
molten steel
ascending
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CN114959185B (en
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倪培远
王家昊
丁玉石
厉英
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Northeastern University China
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Northeastern University China
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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
    • C21C7/10—Handling in a vacuum
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

A nozzle of a rising pipe for strengthening RH refining and a blowing method belong to the technical field of metallurgical engineering secondary refining, and comprise a contraction section, a throat part and an expansion section, wherein the contraction section, the throat part and the expansion section are sequentially connected to form the nozzle, the connection parts of the contraction section, the throat part and the expansion section are connected by corners or fillets, and the diameter change of the contraction section and the expansion section can be linear change or nonlinear change. The invention can improve the impact depth and the action range of the blowing gas in the molten steel, and can improve the capability of powder particles entering the molten steel through an air film by utilizing the powder spraying of the nozzle, promote the dispersion distribution of the particles in the molten steel and improve the refining efficiency. The invention has good practicability, economy and reliability, and is suitable for industrial application.

Description

Ascending pipe nozzle for strengthening RH refining and blowing method
Technical Field
The invention belongs to the technical field of metallurgical engineering secondary refining, and particularly relates to an ascending tube nozzle for strengthening RH refining and a blowing method.
Background
With the development of the steel industry, the development of the material design and application technology of steel brings great challenges to the metallurgical industry. The steel product is developed in the direction of high molten steel cleanliness, high component control precision and high product performance stability. The key points of improving the quality of steel products and producing high-performance steel products are to improve the cleanliness of molten steel, accurately control the components of the molten steel and effectively utilize fine inclusions in the molten steel. At present, the refining technology of clean steel, the production of fine oxide dispersion steel and the precise control technology of trace alloy elements in steel become important subjects faced by steel enterprises in the 21 st century.
The RH refining furnace is one of the external refining devices, and has the advantages of good degassing degree, short treatment period, convenient operation and the like. In 1957, the method was first developed by luer (Ruhrstahl) steel company and helas (Heraeus) vacuum pump company, and is mainly used for producing high-quality steel such as welding high-strength steel, pipeline steel, IF steel, silicon steel, bearing steel and the like. In recent years, the demand for high-quality steel has increased due to the development of industry, and the development of RH refining has been further promoted. At present, RH refining equipment is developed from single degassing equipment into external refining equipment with the functions of decarburization, degassing, desulfurization, dephosphorization, deoxidation, solid inclusion particle removal, molten steel temperature adjustment and the like.
In the existing blowing method, the impact depth of gas entering molten steel through a nozzle is not enough, the gas is mainly located in the area near the inner wall of a riser, the action range of the gas is small, and the gas is not beneficial to efficient refining. In addition, in the RH refining process, the operation of decarburization, desulfurization, dephosphorization, deoxidation and the like is carried out by adopting an additional spray gun to spray powder or throwing a refining agent from a feeding pipe of a vacuum chamber, the spray guns are usually arranged on the top of the vacuum chamber, the side wall of the vacuum chamber, the bottom of the vacuum chamber and the bottom of a steel ladle, and the spraying modes have the problems of short service life of the spray gun, splashing of molten steel in the vacuum chamber, influence on normal circulating flow of the molten steel and the like in the actual production process, are not beneficial to operation and increase the refining cost. The blowing method of the refining agent which is rapidly dispersed and distributed in the molten steel is very key for the high-efficiency refining process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a riser nozzle for strengthening RH refining and a blowing method, and the method is characterized in that a high-speed nozzle is arranged on an RH riser to regulate and control the impact depth and action range of blowing gas in molten steel, so that the refining efficiency is improved. Meanwhile, the nozzle can be used for spraying powder to improve the capability of powder particles entering molten steel through a gas film, promote the dispersion distribution of the particles in the molten steel and improve the reaction efficiency, so that the RH refining period is shortened, the economic cost is reduced, and the invention has good practicability, economy and reliability and is suitable for industrial application.
In order to achieve the purpose, the invention adopts the following technical scheme:
a nozzle of an ascending tube for strengthening RH refining comprises a contraction section, a throat part and an expansion section, wherein the contraction section, the throat part and the expansion section are sequentially connected to form the nozzle, the nozzle is arranged on the wall of the ascending tube, the impact depth and the gas action range of injected gas in molten steel are improved, and powder spraying of the nozzle can improve the capability of powder particles penetrating through a gas film to enter the molten steel and promote the dispersion distribution of the powder particles in the molten steel.
The connection positions of the contraction section, the throat part and the expansion section of the central pore passage of the nozzle are in a corner and fillet connection or an integrated structure, and the diameter change of the contraction section and the diameter change of the expansion section can be linear change or nonlinear change.
The diameter D4 of the inlet of the contraction section is 1-70 mm, and the diameter D4 of the inlet of the contraction section is as follows: throat entrance diameter D3: throat exit diameter D2: the ratio of the diameter D1 of the outlet of the expansion section is 1 (0.1-1): (0.05-1): 0.1-2); the length L3 of the contraction section is 5-1000 mm, and the length L3 of the contraction section is as follows: throat length L2: the ratio of the length L1 of the expanding section is 1 (0-1) to 0-1.
The center of nozzle is seted up along the central pore way of axial setting, set up along the many rings of accessory canals of radial setting on the lateral wall of nozzle, and the accessory canal axis is parallel with the central pore way axis, the accessory canal diameter is 1 ~ 60mm, or the lateral wall of nozzle is provided with the accessory canal with the central pore is endocentric, and the accessory canal falls into urceolus and inner tube with the nozzle, the accessory canal width is 1 ~ 100mm, be connected through the spliced pole between accessory canal urceolus and the inner tube, and the spliced pole is arranged along circumference, and then guarantee the axis collineation of urceolus and inner tube, distance L4 between spliced pole and the export is 0 ~ 1000mm, the height of spliced pole is unanimous with the width in accessory canal, the quantity is 1 ~ 8.
The cross section of each ascending pipe is circular, oval or arched, and the number of the ascending pipes is 1-3.
The nozzle adopts single-layer or multilayer to arrange on the tedge pipe wall, and on every layer equal angular distribution, every layer arranges 3 ~ 12, the nozzle passes through the pipeline and is connected with external air supply and external powder feeding equipment, lower floor's nozzle apart from the tedge bottom 50 ~ 300mm, when adopting multilayer to arrange, the interlamellar spacing of the nozzle between the adjacent layer is 20 ~ 500 mm.
The outlet of the nozzle is vertical to the wall of the ascending pipe or forms a certain angle alpha with the normal of the inner wall at the position, and the angle alpha ranges from 0 degree to 85 degrees; the nozzle is in the horizontal direction or forms a certain included angle beta with the vertical direction, and the angle beta ranges from 10 degrees to 90 degrees.
When the combined gas of argon and oxygen is blown into the ascending pipe through the central pore passage, the volume ratio of argon to oxygen is 1 (0-2), and the flow rate of the mixed gas is 10-500 Nm 3 H; when the secondary pore channel is arranged, oxygen and argon are respectively sprayed into the ascending pipe through the central pore channel and the secondary pore channel, and the oxygen flow of the central pore channel is 10-450 Nm 3 The total argon flow of the secondary channel is 10-350 Nm 3 /h。
When a desulfurization refining agent is blown into the ascending pipe through the central pore passage, the particle size of the powder is less than 5 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h。
When a dephosphorization refining agent is blown into the ascending pipe through the central pore passage, the particle size of the powder is less than 5 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h。
When aluminum powder or rare earth powder is blown into the ascending tube through the central pore channel, the particle size of the powder is less than 3 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h。
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles which are circumferentially and uniformly distributed on the ascending pipe are respectively connected with a corresponding external air source and external powder feeding equipment through pipelines;
step 2: after the ladle enters the station, descending RH equipment or lifting the ladle to enable the ascending pipe and the descending pipe to extend into the molten steel of the ladle to reach a specified depth, wherein the specified depth is 100-600 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to a vacuum degree required by the process, wherein the vacuum degree is 3-500 Pa, and lifting the molten steel to a specified height in a vacuum chamber, wherein the specified height is 30-1000 mm;
and 4, step 4: selecting corresponding process parameters and powder according to process requirements, and blowing oxygen and argon for deep decarburization when only an external air source is started; when the blowing powder is refined, simultaneously starting an external air source and external powder feeding equipment, or starting the external air source firstly and starting the external powder feeding equipment for refining after molten steel forms stable circular flow;
and 5: after refining is started, sampling and measuring temperature every 2-3 min, when the refining target is reached, closing an external air source and external powder feeding equipment, and closing vacuum exhaust equipment after standing;
and 6: after the molten steel is stabilized, the RH equipment is lifted or the steel ladle is descended, so that the ascending pipe and the descending pipe are separated from the molten steel in the steel ladle and then are discharged.
The invention has the beneficial effects that:
the invention can improve the impact depth and the action range of the blowing gas in the molten steel, thereby improving the refining efficiency. Meanwhile, the powder can be sprayed by the nozzle to improve the capability of powder particles entering molten steel through an air film, promote the dispersion distribution of the particles in the molten steel and improve the refining efficiency.
The invention overcomes the problem of molten steel splashing in the vacuum chamber caused by top lance injection, can greatly reduce refractory consumption, and can avoid the obstruction of molten steel flow caused by the bottom injection in the vacuum chamber.
The high-speed nozzle of the invention designs two functions of gas injection and powder injection to be completed in the same channel, can improve the utilization rate of the nozzle, shorten the RH refining period, reduce the economic cost and facilitate the field application.
Drawings
FIG. 1 is a schematic cross-sectional view of a strengthened RH refining riser nozzle using linear corner joints according to example 1 of the present invention;
FIG. 2 is a schematic horizontal cross-sectional view of a circular riser with linear corner junction high speed nozzles according to example 1 of the present invention;
FIG. 3 is a schematic vertical sectional view of a circular riser with linear corner-connected high-speed nozzles according to example 1 of the present invention;
FIG. 4 is a schematic cross-sectional view of a nozzle of an enhanced RH refining riser using a non-linear fillet connection according to example 2 of the present invention;
FIG. 5 is a schematic horizontal sectional view of an elliptical ascending pipe provided with a non-linear fillet connection high-speed nozzle according to example 2 of the present invention;
FIG. 6 is a schematic vertical sectional view of an elliptical ascending tube provided with a non-linear rounded corner connecting high-speed nozzle according to example 2 of the present invention;
FIG. 7 is a schematic cross-sectional view of a strengthened RH refining riser nozzle using a linear fillet connection in accordance with example 3 of the present invention;
FIG. 8 is a schematic horizontal cross-sectional view of an arcuate riser with linear fillet bonded high velocity nozzle according to example 3 of the present invention;
FIG. 9 is a schematic vertical sectional view of an arcuate riser having a linear fillet bonded high velocity nozzle according to example 3 of the present invention;
FIG. 10 is a schematic horizontal sectional view of an elliptical riser for example 4 of the present invention with a high velocity nozzle positioned in connection with a linear corner having an angle to the normal of the inner wall at the nozzle exit location;
FIG. 11 is a schematic vertical section of an ascending tube with the high-speed nozzles of example 4 arranged at a linear corner junction angled from vertical;
FIG. 12 is a schematic horizontal sectional view of an elliptical riser pipe of example 5 of the present invention with a high-speed nozzle arranged with a linear fillet at an angle to the normal of the inner wall at the nozzle exit position;
FIG. 13 is a schematic vertical sectional view of a riser for a high velocity jet nozzle arranged in accordance with example 5 with linear fillet connections at an angle to the vertical;
FIG. 14 is a schematic cross-sectional view of a non-linear radiused corner joined enhanced RH refining riser nozzle with radially disposed single-radiused secondary orifices of example 6 of the present invention;
FIG. 15 is a cross-sectional view of FIG. 14 in accordance with embodiment 6 of the present invention;
FIG. 16 is a schematic horizontal cross-sectional view of a circular riser with a radially disposed single-round secondary duct having a non-linear fillet connecting high-speed nozzle according to example 6 of the present invention;
FIG. 17 is a schematic vertical cross-sectional view of a circular riser with a radially disposed single-circular secondary orifice and non-linear fillet connecting high-speed nozzles according to example 6 of the present invention;
FIG. 18 is a cross-sectional view of a strengthened RH refining riser nozzle with non-linear radiused corner joints having secondary equal diameter channels concentric with the central channel in accordance with example 7 of the present invention
FIG. 19 is a schematic sectional view of FIG. 18 in accordance with embodiment 7 of the present invention;
FIG. 20 is a schematic horizontal cross-sectional view of a circular riser having a constant diameter secondary channel non-linear radiused connecting high velocity nozzle concentric with the inner central channel of example 7 of the present invention;
FIG. 21 is a schematic vertical cross-sectional view of a circular riser with a non-linear radiused connecting high velocity nozzle of example 7 of the present invention arranged with secondary orifices of equal diameter concentric with the central orifice;
FIG. 22 is a schematic view of the connection of the high-speed nozzle to an external gas source according to the present invention;
FIG. 23 is a schematic view of the connection of the high-speed nozzle of the present invention with an external gas source and an external powder feeder;
1-contraction section, 2-throat, 3-expansion section, 4-central pore channel, 5-subsidiary pore channel, 6-connecting column, 7-ascending tube, 8-ascending tube wall, 9-nozzle, 10-vacuum chamber, 11-descending tube, 12-external air source and 13-external powder feeding equipment.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
Example 1
As shown in fig. 1 to 3 and 22, the ascending tube nozzle for strengthening RH refining comprises a contraction section 1, a throat section 2 and an expansion section 3, wherein the contraction section 1, the throat section 2 and the expansion section 3 are sequentially connected to form a nozzle 9, the nozzle 9 is arranged on a tube wall 8 of the ascending tube to improve the impact depth and the gas action range of blowing gas in molten steel, and the powder injection of the nozzle 9 can improve the powder particle capacity of entering molten steel through a gas film and promote the dispersion distribution of powder particles in the molten steel. The diameter D4 of the inlet of the contraction section 1 is 10mm, the diameter D3 of the inlet of the throat 2 is 9mm, the diameter D2 of the outlet of the throat 2 is 5mm, and the diameter D1 of the outlet of the expansion section 3 is 3 mm; the length L3 of the contraction section 1 is 15mm, the length L2 of the throat part 2 is 5mm, and the length L1 of the expansion section 3 is 10 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by corners, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are linear change. The cross section of the ascending pipe 7 is circular, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a double-layer mode, the nozzles are distributed on each layer at equal angles along the circumferential direction, 8 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 250mm, and the layer spacing between the nozzles 9 on the adjacent layers is 200 mm. The outlet of the nozzle 9 is vertical to the wall 8 of the ascending pipe, and the nozzle 9 is in the horizontal direction.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with an external air source 12 through pipelines;
and 2, step: after the ladle enters the station, the RH equipment is descended or the ladle is lifted, so that the ascending pipe 7 and the descending pipe 11 are extended into the molten steel of the ladle by 500 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to a 400mm position in the vacuum chamber 10;
and 4, step 4: starting an external gas source 12, blowing mixed gas of argon and oxygen into an ascending pipe 7 through a central pore passage 4 by a connecting pipeline of the external gas source 12 for reinforced decarburization, wherein the volume ratio of the argon to the oxygen is 1:1, and the flow rate of the mixed gas is 150Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The carbon content of the casting blank treated by the prior art is 25ppm, and the carbon content of the casting blank treated by the method is 12ppm, which is reduced by 13 ppm.
Example 2
As shown in fig. 4 to 6 and 23, the inlet diameter D4 of the convergent section 1 is 15mm, the inlet diameter D3 of the throat 2 is 10mm, the outlet diameter D2 of the throat 2 is 3mm, and the outlet diameter D1 of the divergent section 3 is 20 mm; the length L3 of the contraction section 1 is 15mm, the length L2 of the throat part 2 is 5mm, and the length L1 of the expansion section 3 is 10 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by a fillet, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are nonlinear change. The cross section of the ascending pipe 7 is oval, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a double-layer mode, and are distributed on each layer at equal angles along the circumferential direction, 4 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 250mm, and the layer spacing between the nozzles 9 on the adjacent layers is 200 mm. The outlet of the nozzle 9 is vertical to the inner wall of the ascending pipe 7, and the nozzle 9 is in the horizontal direction.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with a corresponding external air source 12 and external powder feeding equipment 13 through pipelines;
step 2: after the ladle enters the station, the RH equipment is descended, so that the RH ascending pipe 7 and the RH descending pipe 11 are deeply embedded into the molten steel of the ladle by 400 mm;
and 3, step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to a 350mm position in the vacuum chamber 10;
and 4, step 4: simultaneously starting an external air source 12 and an external powder feeding device 13, and blowing a dephosphorization refining agent into the ascending tube 7 through a central pore passage 4 by a connecting pipeline of the external air source 12, wherein the granularity of powder is 3mm, the carrier gas is nitrogen, and the gas flow is 180Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the steel ladle and then are discharged.
The phosphorus content of the cast slab treated by the prior art was 54 ppm. The phosphorus content of the casting blank treated by the method is 30 ppm. The reduction was 24 ppm.
Example 3
As shown in fig. 7 to 9, the inlet diameter D4 of the convergent section 1 is 10mm, the inlet diameter D3 of the throat 2 is 10mm, the outlet diameter D2 of the throat 2 is 5mm, and the outlet diameter D1 of the divergent section 3 is 3 mm; the length L3 of the contraction section 1 is 10mm, the length L2 of the throat part 2 is 4mm, and the length L1 of the expansion section 3 is 15 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by a circular angle, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are linear change. The cross section of the ascending pipe 7 is arched, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in three layers, and are distributed on each layer at equal angles along the circumferential direction, 5 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 200mm, and the layer spacing between the nozzles 9 on the adjacent layers is 200 mm. The outlet of the nozzle 9 is vertical to the wall 8 of the ascending pipe, and the nozzle 9 is in the horizontal direction.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with a corresponding external air source 12 and an external powder feeding device 13 through pipelines;
step 2: after the ladle enters the station, the RH equipment is descended, so that the RH ascending pipe 7 and the RH descending pipe 11 are deeply embedded into the molten steel of the ladle by 550 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 133Pa, and lifting the molten steel to a position 400mm in the vacuum chamber 10;
and 4, step 4: simultaneously starting an external air source 12 and an external powder feeding device 13, blowing a desulfurization refining agent into the ascending pipe 7 through a connecting pipeline of the external air source 12 and a central pore passage 4, wherein the particle size of the powder is 4mm, the carrier gas is carbon dioxide, and the gas flow is 150Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 3min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The sulfur content of the cast slab treated by the prior art was 48 ppm. The sulfur content of the casting blank treated by the method is 28 ppm. The reduction was 20 ppm.
Example 4
As shown in fig. 10 and 11, the inlet diameter D4 of the convergent section 1 is 8mm, the inlet diameter D3 of the throat 2 is 5mm, the outlet diameter D2 of the throat 2 is 3mm, and the outlet diameter D1 of the divergent section 3 is 5 mm; the length L3 of the contraction section 1 is 25mm, the length L2 of the throat part 2 is 8mm, and the length L1 of the expansion section 3 is 10 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by a fillet, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are nonlinear change. The cross section of the ascending pipe 7 is circular, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a single layer mode, are distributed on each layer at equal angles along the circumferential direction, 10 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 70mm, and the layer spacing between the nozzles 9 on the adjacent layers is 300 mm. The outlet of the high-speed nozzle 9 forms a certain angle alpha with the normal line of the inner wall at the position, wherein alpha is 30 degrees, and the high-speed nozzle 9 forms a certain angle beta with the vertical direction, and beta is 70 degrees.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with a corresponding external air source 12 and an external powder feeding device 13 through pipelines;
step 2: after the ladle enters the station, the RH equipment is descended to ensure that the RH ascending pipe 7 and the RH descending pipe 11 are deeply embedded into the molten steel of the ladle by 450 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to a 400mm position in the vacuum chamber 10;
and 4, step 4: simultaneously starting an external gas source 12 and an external powder feeding device 13, and blowing aluminum powder into the ascending tube 7 through a connecting pipeline of the external gas source 12 and the central pore passage 4, wherein the powder granularity is 2mm, the carrier gas is argon, and the gas flow is 120Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The oxygen content of the cast blank after treatment by the prior art was 18 ppm. The oxygen content of the casting blank treated by the method is 8 ppm. The reduction was 10 ppm.
Example 5
As shown in fig. 12 and 13, the inlet diameter D4 of the convergent section 1 is 15mm, the inlet diameter D3 of the throat 2 is 15mm, the outlet diameter D2 of the throat 2 is 15mm, and the outlet diameter D1 of the divergent section 3 is 15 mm; the length L3 of the contraction section 1 is 20mm, the length L2 of the throat part 2 is 10mm, and the length L1 of the expansion section 3 is 5 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by a fillet, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are linear change. The cross section of the ascending pipe 7 is circular, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a double-layer mode, the nozzles are distributed on each layer at equal angles along the circumferential direction, 8 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 100mm, and the layer spacing between the nozzles 9 on the adjacent layers is 250 mm. The outlet of the high-speed nozzle 9 forms a certain angle alpha with the normal line of the inner wall at the position, wherein alpha is 45 degrees, and the high-speed nozzle 9 forms a certain angle beta with the vertical direction, and beta is 80 degrees.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with a corresponding external air source 12 and an external powder feeding device 13 through pipelines;
step 2: after the steel ladle enters the station, the RH equipment is descended, so that the RH ascending pipe 7 and the RH descending pipe 11 are inserted into the steel ladle liquid by 500 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to 450mm in the vacuum chamber 10;
and 4, step 4: the external gas source 12 is started first, and the external powder feeding device 13 is started after the molten steel forms stable circular flow. Rare earth powder is blown into the ascending pipe 7 through the central pore passage 4 by a connecting pipeline connected with an external gas source 12, the particle size of the powder is 2mm, the carrier gas is argon, and the gas flow is 210Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The oxygen content of the cast blank after treatment by the prior art was 15 ppm. The oxygen content of the casting blank treated by the method is 6 ppm. The reduction was 9 ppm.
Example 6
As shown in fig. 14 to 17, the inlet diameter D4 of the convergent section 1 is 5mm, the inlet diameter D3 of the throat 2 is 5mm, the outlet diameter D2 of the throat 2 is 2mm, and the outlet diameter D1 of the divergent section 3 is 6 mm; the length L3 of the contraction section 1 is 10mm, the length L2 of the throat part 2 is 7mm, and the length L1 of the expansion section 3 is 15 mm. The connection parts of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 are connected by a fillet, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are nonlinear change. Besides the central hole channel 4 arranged at the center of the nozzle 9, a circle of secondary hole channels 5 arranged along the radial direction and with the diameter of 5mm are also arranged on the side wall of the nozzle 9. The cross section of the ascending pipe 7 is circular, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a double-layer mode, the nozzles are distributed on each layer at equal angles along the circumferential direction, 8 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 250mm, and the layer spacing between the nozzles 9 on the adjacent layers is 200 mm. The outlet of the nozzle 9 is vertical to the wall 8 of the ascending pipe, and the nozzle 9 is in the horizontal direction.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with an external air source 12 through pipelines;
step 2: after the ladle enters the station, the RH equipment is descended or the ladle is lifted, so that the ascending pipe 7 and the descending pipe 11 are extended into the molten steel of the ladle by 500 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to a 400mm position in the vacuum chamber 10;
and 4, step 4: starting an external air source 12, and blowing oxygen into the ascending pipe 7 through the central pore passage 4, wherein the oxygen flow of the central pore passage 4 is 200Nm 3 H, blowing argon into the ascending pipe 7 through the secondary duct 5, wherein the total argon flow of the secondary duct 5 is 150Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The carbon content of the casting blank treated by the prior art is 27ppm, and the carbon content of the casting blank treated by the method is 8ppm, which is reduced by 19 ppm.
Example 7
As shown in fig. 18 to 21, the inlet diameter D4 of the convergent section 1 is 10mm, the inlet diameter D3 of the throat 2 is 8mm, the outlet diameter D2 of the throat 2 is 3mm, and the outlet diameter D1 of the divergent section 3 is 5 mm; the length L3 of the contraction section 1 is 15mm, the length L2 of the throat part 2 is 17mm, and the length L1 of the expansion section 3 is 20 mm. The joint of the contraction section 1, the throat part 2 and the expansion section 3 of the central pore passage 4 of the nozzle 9 is in corner connection, and the diameter change of the contraction section 1 and the diameter change of the expansion section 3 are linear changes. Nozzle 9 except that center department sets up central pore 4, nozzle 9's lateral wall is provided with the concentric isodiametric accessory pore 5 with central pore 4, the width is 20mm, and accessory pore 5 divides into urceolus and inner tube with nozzle 9, be connected through spliced pole 6 between 5 urceolus of accessory pore and the inner tube, and spliced pole 6 is arranged along circumference equidistant, and then guarantee the axis collineation of urceolus and inner tube, distance L4 between spliced pole 6 and the export is 40mm, spliced pole 6's height is unanimous with accessory pore 5's width, quantity is 2. The cross section of the ascending pipe 7 is circular, and the number of the ascending pipes 7 is 1. The nozzles 9 are distributed on the pipe wall 8 of the ascending pipe in a double-layer mode, are distributed on each layer at equal angles along the circumferential direction, 6 nozzles are arranged on each layer, the nozzles 9 are connected with an external air source 12 and an external powder feeding device 13 through pipelines, the distance between the nozzles 9 on the lower layer and the bottom of the ascending pipe 7 is 250mm, and the layer spacing between the nozzles 9 on the adjacent layers is 200 mm. The outlet of the nozzle 9 is vertical to the wall 8 of the ascending pipe, and the nozzle 9 is in the horizontal direction.
A riser blowing method for strengthening RH refining comprises the following steps:
step 1: before the ladle enters the station, all nozzles 9 which are circumferentially and uniformly distributed on the ascending pipe 7 are respectively connected with a corresponding external air source 12 and an external powder feeding device 13 through pipelines;
step 2: after the ladle enters the station, the RH equipment is descended to ensure that the RH ascending pipe 7 and the RH descending pipe 11 are deeply embedded into the molten steel of the ladle by 450 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to 67Pa, and lifting the molten steel to a 400mm position in the vacuum chamber 10;
and 4, step 4: simultaneously starting an external gas source 12 and an external powder feeding device 13, and blowing rare earth powder into the ascending pipe 7 through a central pore passage 4 by a connecting pipeline of the external gas source 12, wherein the granularity of the powder is 2.5mm, the carrier gas is argon, and the gas flow is 150Nm 3 H; blowing nitrogen into the ascending pipe 7 through the subsidiary duct 5, wherein the total nitrogen flow of the subsidiary duct 5 is 180Nm 3 /h；
And 5: after refining is started, sampling and temperature measurement are carried out every 2min, after the refining target is reached, the external air source 12 is closed, and the vacuum exhaust equipment is closed after standing;
step 6: and lifting the RH equipment after the molten steel is stable, so that the RH ascending pipe 7 and the RH descending pipe 11 are separated from the molten steel in the ladle and then are discharged.
The oxygen content of the cast slab after treatment by the prior art was 16 ppm. The oxygen content of the casting blank treated by the method is 5 ppm. The reduction was 11 ppm.

Claims (10)

1. A nozzle of an ascending tube for strengthening RH refining is characterized by comprising a contraction section, a throat part and an expansion section, wherein the contraction section, the throat part and the expansion section are sequentially connected to form the nozzle, the nozzle is arranged on the tube wall of the ascending tube, the impact depth and the gas action range of injected gas in molten steel are improved, and powder spraying of the nozzle can improve the capability of powder particles entering the molten steel through a gas film and promote the dispersion distribution of the powder particles in the molten steel.
2. The nozzle of claim 1, wherein the nozzle comprises: the connection positions of the contraction section, the throat part and the expansion section of the central pore passage of the nozzle are in a corner and fillet connection or an integrated structure, and the diameter change of the contraction section and the diameter change of the expansion section can be linear change or nonlinear change.
3. The nozzle of claim 1, wherein the nozzle comprises: the diameter D4 of the inlet of the contraction section is 1-70 mm, and the diameter D4 of the inlet of the contraction section is as follows: throat entrance diameter D3: throat exit diameter D2: the ratio of the diameter D1 of the outlet of the expansion section is 1 (0.1-1): (0.05-1): 0.1-2); the length L3 of the contraction section is 5-1000 mm, and the length L3 of the contraction section is as follows: throat length L2: the ratio of the length L1 of the expanding section is 1 (0-1) to 0-1.
4. The nozzle of claim 1, wherein the nozzle comprises: the center of the nozzle is provided with a central pore channel arranged along the axial direction, the side wall of the nozzle is provided with a plurality of circles of secondary pore channels arranged along the radial direction, the axes of the secondary pore channels are parallel to the axis of the central pore channel, and the diameter of each secondary pore channel is 1-60 mm;
or the side wall of the nozzle is provided with a secondary duct concentric with the central duct, the secondary duct divides the nozzle into an outer barrel and an inner barrel, the width of the secondary duct is 1-100 mm, the outer barrel and the inner barrel of the secondary duct are connected through a connecting column, the connecting column is arranged along the circumferential direction, the axes of the outer barrel and the inner barrel are further guaranteed to be collinear, the distance L4 between the connecting column and an outlet is 0-1000 mm, the height of the connecting column is consistent with the width of the secondary duct, and the number of the connecting columns is 1-8.
5. The nozzle of claim 1, wherein the nozzle comprises: the cross section of each ascending pipe is circular, oval or arched, and the number of the ascending pipes is 1-3.
6. The nozzle of claim 1, wherein the nozzle comprises: the nozzles are distributed on the pipe wall of the ascending pipe in a single-layer or multi-layer mode, the nozzles are distributed on each layer at equal angles, 3-12 nozzles are distributed on each layer, the nozzles are connected with an external air source and external powder feeding equipment through pipelines, and the distance between the nozzles on the lower layer and the bottom of the ascending pipe is 50-300 mm; when the multi-layer arrangement is adopted, the interlayer spacing of the nozzles between adjacent layers is 20-500 mm.
7. The nozzle of claim 1, wherein the nozzle comprises: the outlet of the nozzle is vertical to the wall of the ascending pipe or forms a certain angle alpha with the normal of the inner wall at the position, and the angle alpha ranges from 0 degree to 85 degrees; the nozzle is in the horizontal direction or forms a certain included angle beta with the vertical direction, and the angle beta ranges from 10 degrees to 90 degrees.
8. The nozzle of claim 4, wherein the nozzle comprises: when the combined gas of argon and oxygen is blown into the ascending pipe through the central pore passage, the volume ratio of the argon to the oxygen is 1 (0-2), and the flow rate of the mixed gas is 10-500 Nm 3 H; when provided with the subsidiary channels, respectively pass through the central channel and the subsidiary channelsOxygen and argon are sprayed into the ascending tube, and the oxygen flow in the central pore passage is 10-450 Nm 3 Per hour, the total argon flow of the secondary channel is 10-350 Nm 3 /h。
9. The nozzle of claim 4, wherein the nozzle comprises: when a desulfurization refining agent is blown into the ascending pipe through the central pore passage, the particle size of the powder is less than 5 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h；
When a dephosphorization refining agent is blown into the ascending pipe through the central pore passage, the particle size of the powder is less than 5 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h；
When aluminum powder or rare earth powder is blown into the ascending tube through the central pore channel, the particle size of the powder is less than 3 mm; the carrier gas is argon, nitrogen or carbon dioxide, and the gas flow is 10-500 Nm 3 H; when the secondary pore passage is arranged, argon, nitrogen or carbon dioxide is blown into the ascending pipe through the secondary pore passage, and the total gas flow of the secondary pore passage is 10-350 Nm 3 /h。
10. The blowing method of the ascending tube nozzle for intensive RH refining according to claim 1, comprising the steps of:
step 1: before the ladle enters the station, all nozzles which are circumferentially and uniformly distributed on the ascending pipe are respectively connected with a corresponding external air source and external powder feeding equipment through pipelines;
step 2: after the ladle enters the station, descending RH equipment or lifting the ladle to enable the ascending pipe and the descending pipe to extend into the molten steel of the ladle to reach a specified depth, wherein the specified depth is 100-600 mm;
and step 3: starting vacuum exhaust equipment, vacuumizing to the vacuum degree required by the process, wherein the vacuum degree is 3-500 Pa, and lifting the molten steel to the specified height in the vacuum chamber, wherein the specified height is 30-1000 mm;
and 4, step 4: selecting corresponding process parameters and powder according to process requirements, and blowing oxygen and argon for deep decarburization when only an external air source is started; when the powder is blown for refining, an external air source and external powder feeding equipment are simultaneously started, or the external air source is started first, and the external powder feeding equipment is started for refining after molten steel forms stable circular flow;
and 5: after refining is started, sampling and measuring temperature every 2-3 min, when the refining target is reached, closing an external air source and external powder feeding equipment, and closing vacuum exhaust equipment after standing;
step 6: after the molten steel is stabilized, the RH equipment is lifted or the steel ladle is descended, so that the ascending pipe and the descending pipe are separated from the molten steel in the steel ladle and then are discharged.
CN202210604844.1A 2022-05-31 2022-05-31 Ascending pipe nozzle for strengthening RH refining and blowing method Active CN114959185B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239733A (en) * 1999-02-19 2000-09-05 Sumitomo Metal Ind Ltd Production of high cleanliness steel
CN102560009A (en) * 2012-01-16 2012-07-11 东北大学 RH vacuum refining bottom blowing powder injection device
CN103966402A (en) * 2014-05-14 2014-08-06 东北大学 RH (Relative Humidity) vacuum refining system and desulfuration method for molten steel desulfuration
CN104561452A (en) * 2015-01-16 2015-04-29 东北大学 Device and method for single snorkel vacuum degassing refining of molten steel by employing bottom injection
CN112620058A (en) * 2020-12-23 2021-04-09 北京强度环境研究所 Hartmann sound generator with laval nozzle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239733A (en) * 1999-02-19 2000-09-05 Sumitomo Metal Ind Ltd Production of high cleanliness steel
CN102560009A (en) * 2012-01-16 2012-07-11 东北大学 RH vacuum refining bottom blowing powder injection device
CN103966402A (en) * 2014-05-14 2014-08-06 东北大学 RH (Relative Humidity) vacuum refining system and desulfuration method for molten steel desulfuration
CN104561452A (en) * 2015-01-16 2015-04-29 东北大学 Device and method for single snorkel vacuum degassing refining of molten steel by employing bottom injection
CN112620058A (en) * 2020-12-23 2021-04-09 北京强度环境研究所 Hartmann sound generator with laval nozzle

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