CN114700485A - Tundish argon gas replacement device and method - Google Patents
Tundish argon gas replacement device and method Download PDFInfo
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- CN114700485A CN114700485A CN202210427190.XA CN202210427190A CN114700485A CN 114700485 A CN114700485 A CN 114700485A CN 202210427190 A CN202210427190 A CN 202210427190A CN 114700485 A CN114700485 A CN 114700485A
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- Prior art keywords
- tundish
- argon
- outlet pipe
- pipe
- air outlet
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 350
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 175
- 239000007789 gas Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 238000006073 displacement reaction Methods 0.000 claims description 42
- 238000005253 cladding Methods 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000011549 displacement method Methods 0.000 claims 3
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000005266 casting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
-
- 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
- C21C7/04—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)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a tundish argon gas replacement device and a method, wherein the tundish argon gas replacement device comprises an air inlet pipe, a flow dividing pipe connected with the air inlet pipe and an air outlet pipe connected with the flow dividing pipe; the air inlet pipe comprises a horizontal section and a vertical section, and the tail end of the horizontal section is connected with the head end of the vertical section; the shunt tube is connected with the tail end of the vertical section. According to the invention, the argon replacement device is fixed in the tundish impact area to protect the interior of the tundish impact area and the periphery of the molten steel channel, so that the molten steel quality is improved, and the service life of the tundish refractory working layer is prolonged.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a tundish argon gas replacement device and method.
Background
In the continuous casting production process in the steelmaking industry, the secondary oxidation pollution of refined molten steel is avoided, and the method is an indispensable link for the research and development of high-end products. Usually, argon replacement is carried out by covering a pouring area of a tundish of a first furnace in the next pouring, however, a pouring device is not protected in an impact area, and molten steel is easy to be directly contacted with air to be oxidized, so that secondary pollution influences the quality of a casting blank.
CN 205673577U discloses a prevent device of middle package molten steel secondary oxidation, and the argon gas delivery pipe is horizontal to be placed on the middle package be built by contract, and metal collapsible tube's rear end is connected on the body of rod of argon gas delivery pipe, and metal collapsible tube's front end is connected with the oxygen lance, and the front portion of oxygen lance is buckled downwards perpendicularly, and the front end of oxygen lance stretches into in the middle package, and the rear end of argon gas delivery pipe is connected with the argon gas pipeline. The utility model discloses a can form one deck argon gas layer on middle package liquid steel level upper portion in the early stage of casting, keep apart air and molten steel, prevent molten steel secondary oxidation. However, the utility model does not protect the pouring of the tundish impact area, and is not fixed, which easily causes unstable and uneven argon blowing.
CN 204018701U discloses an argon blowing device for protecting and pouring a continuous casting T-shaped tundish, which consists of a frame, an air supply pipe, an argon blowing pipe, a quick connector and a nozzle, wherein the device is placed on a refractory material lining of an impact area of the T-shaped tundish before pouring, argon is sprayed out from the nozzle during pouring, an air curtain is formed in the impact area, and air is isolated to protect molten steel; after casting, the apparatus was removed. The device can isolate the contact of molten steel with air in the impact area of the tundish, and prevent the molten steel from being secondarily oxidized in the pouring process. However, the device still needs to be moved repeatedly before and after pouring, the operation is complex, and the argon blowing device is placed unstably, so that the pouring protection effect of the impact area cannot be guaranteed.
Aiming at the defects of the prior art, the argon replacement device for protecting the impact area of the pouring first furnace tundish and stabilizing argon blowing needs to be provided.
Disclosure of Invention
The invention aims to provide a tundish argon gas replacement device and a tundish argon gas replacement method.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a tundish argon gas replacement device, which includes an air inlet pipe, a shunt pipe connected to the air inlet pipe, and an air outlet pipe connected to the shunt pipe.
The air inlet pipe comprises a horizontal section and a vertical section, and the tail end of the horizontal section is connected with the head end of the vertical section.
The shunt tube is connected with the tail end of the vertical section.
According to the tundish argon gas replacement device provided by the invention, the gas inlet pipe, the flow dividing pipe and the gas outlet pipe are arranged according to the shape and the structure of the tundish, and all the sections are welded and fixed at the edge position of one side of the tundish shell impact area; argon replacement is carried out on the impact area and the periphery of the molten steel channel, so that the pollution of the molten steel is reduced, and the service life of the refractory material is prolonged.
Preferably, the centerline of the shunt tube is at an angle of 90-95 ° to the centerline of the vertical section, such as 90 °, 91 °, 92 °, 93 °, 94 °, or 95 °, but not limited to the values recited, and other values within the range of values not recited are equally applicable.
Preferably, the shunt tube is arranged in the same plane with the intake tube.
Preferably, the outlet pipe comprises a first outlet pipe and a second outlet pipe.
Preferably, the first outlet pipe is connected with the middle section of the shunt pipe, and the included angle between the central line of the first outlet pipe and the central line of the shunt pipe is 90-95 degrees, such as 90 degrees, 91 degrees, 92 degrees, 93 degrees, 94 degrees or 95 degrees, but not limited to the values listed, and other values not listed in the numerical range are also applicable.
The first air outlet pipe blows argon to the periphery of the molten steel channel, and the protective atmosphere of argon can be formed at the initial stage when the molten steel of the first furnace ladle flows into the tundish, so that N in the air can be effectively reduced2And O2Secondary pollution caused by direct contact with molten steel.
Preferably, the second outlet tube is connected to the end of the shunt tube, and the angle between the centerline of the second outlet tube and the centerline of the shunt tube is 30 ° -60 °, such as 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, or 60 °, but not limited to the values listed, and other values not listed in the range of values are also applicable.
And the second gas outlet pipe blows argon to the inside of the impact area, and the protective atmosphere of argon can be formed at the initial stage when the molten steel of the first furnace flows into the tundish, so that the working environment of the molten steel poured in the first furnace in the tundish is improved, and the quality of the molten steel is improved.
Preferably, the shunt pipe, the air inlet pipe, the first air outlet pipe and the second air outlet pipe are arranged in the same plane.
Preferably, the first air outlet pipe and the second air outlet pipe are arranged on two sides of the shunt pipe.
Preferably, the distance between the first air outlet pipe and the tail end of the shunt pipe is (0.2-0.3) x d; wherein d is the width of the impact zone in the tundish.
The distance between the first outlet pipe and the end of the shunt pipe is (0.2-0.3) x d, and can be, for example, 0.2d, 0.22d, 0.25d, 0.28d or 0.3d, but is not limited to the values listed, and other values not listed in the range of values are also applicable.
Preferably, the length L of the horizontal segment is (0.4-0.6) x (L-d); wherein L is the cladding length of the tundish and d is the width of the impact zone in the tundish.
The length L of the horizontal segment is (0.4-0.6) × (L-d), and may be, for example, 0.4 × (L-d), 0.42 × (L-d), 0.45 × (L-d), 0.48 × (L-d), or 0.5 × (L-d), but is not limited to the values recited, and other values not recited in the range of values are also applicable.
The horizontal section is welded and fixed on the upper edge of the cladding of the tundish according to the size of the cladding of the tundish, so that the influence on the movement and molten steel bearing of the tundish can be avoided, and argon is stably blown.
Preferably, the length h of the vertical segment is (0.9-1.1) × h1(ii) a Wherein h is1The distance between the upper edge of the impact area in the tundish and the upper edge of the cladding of the tundish is disclosed.
The length h of the vertical section is (0.9-1.1) x h1For example, it may be 0.9h1、0.95h1、h1、1.05h1Or 1.1h1But are not limited to the recited values, and other values within the numerical range not recited are equally applicable.
Preferably, the length of the shunt tube is (0.7-0.8) x d; wherein d is the width of the impact zone in the tundish.
The shunt has a length of (0.7-0.8). times.d, and can be, for example, 0.7d, 0.72d, 0.75d, 0.78d, or 0.8d, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the length of the first outlet duct is 0.1-0.2m, for example 0.1m, 0.12m, 0.15m, 0.18m or 0.2m, but not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the length of the second outlet pipe is 0.08-0.12m, for example, 0.08m, 0.09m, 0.1m, 0.11m or 0.12m, but not limited to the values listed, and other values not listed in the range of values are also applicable.
The length of the second air outlet pipe is set according to the width of the impact area and the distance between the upper edge of the impact area in the tundish and the upper edge of the cladding of the tundish, the second air outlet pipe can touch the inner wall of the impact area when the length is too large, and the argon can not be ensured to completely enter the impact area when the length is too small.
Preferably, the length L of the tundish envelope is 6-10m, for example 6m, 7m, 8m, 9m or 10m, but is not limited to the values listed, and other values not listed in the range of values are equally suitable.
Preferably, the width d of the impact zone is from 0.8 to 1.2m, and may be, for example, 0.8m, 0.9m, 1m, 1.1m or 1.2m, but is not limited to the values recited, and other values not recited in the range of values are equally applicable.
Preferably, the distance h between the upper edge of the impact area in the tundish and the upper edge of the cladding of the tundish1Is 0.09 to 0.11m, and can be, for example, 0.09m, 0.095m, 0.1m, 0.105m or 0.11m, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the ratio of the length of the horizontal segment to the length of the vertical segment is (29-40):1, and may be, for example, 29:1, 31:1, 33:1, 35:1, 37:1 or 40:1, but is not limited to the values recited, and other values not recited within the range of values are equally applicable.
Preferably, the ratio of the length of the horizontal segment to the shunt tube is (4.3-4.9):1, and can be, for example, 4.3:1, 4.4:1, 4.5:1, 4.6:1, 4.7:1, 4.8:1, or 4.9:1, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
Preferably, the first outlet duct and the second outlet duct have a diameter of 0.023 to 0.027m, for example 0.023m, 0.024m, 0.025m, 0.026m or 0.027m, but not limited to the values recited, and other values not recited in the numerical range are equally applicable.
The diameters of the first air outlet pipe and the second air outlet pipe are arranged, so that the stable and uniform blowing of argon out of the pipe sections can be ensured, the uneven or even abnormal air outlet can be caused due to the fact that the diameters are too large or too small, and the argon protection effect in the impact area and around the molten steel channel is difficult to ensure.
In a second aspect, the present invention provides a method for replacing a tundish argon gas replacement device according to the first aspect, the method comprising the steps of: fixing a tundish argon displacement device at the edge of one side of a tundish cladding impact area; when the tundish runs to the steel bearing position, opening the argon replacement device to perform argon replacement; and (4) allowing the molten steel in the first furnace to flow for 4-6 minutes, adding a covering agent into the tundish, and closing the argon replacement device.
The replacement method is carried out by adopting the tundish argon replacement device provided by the first aspect, and when the gas outlet pipe in the tundish argon replacement device comprises a first gas outlet pipe and a second gas outlet pipe, the argon replacement device can be arranged to carry out argon replacement on the inside of the impact area and the periphery of the molten steel channel; when the gas outlet pipe only comprises a second gas outlet pipe, the argon displacement device is arranged to displace argon in the impact area.
Preferably, the outlet pressure of the argon displacement device is 0.2-0.34MPa, such as 0.2MPa, 0.22MPa, 0.24MPa, 0.26MPa, 0.28MPa, 0.3MPa, 0.32MPa or 0.34MPa, but not limited to the values recited, and other values not recited within the range of values are equally applicable.
Preferably, the argon displacement device has an argon flow rate of 20-40L/min, such as 20L/min, 25L/min, 30L/min, 35L/min or 40L/min, but not limited to the values recited, and other values not recited within the range of values are equally applicable.
As a preferable embodiment of the substitution method provided by the second aspect of the present invention, the substitution method comprises the steps of: fixing a tundish argon displacement device at the edge of one side of a tundish cladding impact area; when the tundish runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the outlet pressure of the argon displacement device is 0.2-0.34MPa, and the argon flow is 20-40L/min; and (4) allowing the first furnace molten steel to flow for 4-6 minutes, adding a covering agent into the tundish, and closing the argon replacement device.
Compared with the prior art, the invention has the following beneficial effects:
an argon replacement device is fixed in the tundish impact area to protect the interior of the tundish impact area and the periphery of a molten steel channel, so that the pollution of the first furnace molten steel in the casting process is reduced, the quality of the molten steel is improved, the nitrogen increment of a first furnace casting blank is less than or equal to 0.0005%, the aluminum burning loss is less than or equal to 0.003%, and the average service life of a refractory working layer of the tundish can be prolonged to be more than 4 hours; the argon replacement device provided by the invention can be fixed at the edge of the intermediate cladding, and compared with a mobile argon blowing device, the argon blowing device is stable and uniform in argon blowing and convenient to operate.
Drawings
FIG. 1 is a schematic structural diagram of a tundish argon gas replacement device provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a tundish provided in application example 1 of the present invention.
Wherein: 1, horizontal segment; 2, a vertical section; 3, a shunt pipe; 4, a first air outlet pipe; 5, a second air outlet pipe; 6, pouring in a tundish; and 7, an impact area.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a tundish argon gas replacement device as shown in fig. 1, which includes an air inlet pipe, a shunt pipe 3 connected to the air inlet pipe, and an air outlet pipe connected to the shunt pipe 3;
the air inlet pipe comprises a horizontal section 1 and a vertical section 2, and the tail end of the horizontal section 1 is connected with the head end of the vertical section 2; the shunt tube 3 is connected with the tail end of the vertical section 2;
the included angle between the center line of the shunt tube 3 and the center line of the vertical section 2 is 92 degrees, and the shunt tube 3 and the air inlet tube are arranged in the same plane;
the air outlet pipe comprises a first air outlet pipe 4 and a second air outlet pipe 5; the first air outlet pipe 4 is connected with the middle section of the shunt pipe 3, and the included angle between the central line of the first air outlet pipe 4 and the central line of the shunt pipe 3 is 93 degrees; the second air outlet pipe 5 is connected with the tail end of the shunt pipe 3, and the included angle between the central line of the second air outlet pipe 5 and the central line of the shunt pipe 3 is 45 degrees; the shunt pipe 3, the air inlet pipe, the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on the same plane; the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on two sides of the shunt pipe 3; the distance between the first air outlet pipe 4 and the tail end of the shunt pipe 3 is 0.25 m;
the length of the horizontal section 1 is 3.5 m; the length of the vertical section 2 is 0.1 m; the length of the shunt pipe 3 is 0.75 m; the length of the first air outlet pipe 4 is 0.15 m; the length of the second air outlet pipe 5 is 0.1 m; the diameters of the first air outlet pipe 4 and the second air outlet pipe 5 are 0.025 m.
Example 2
The embodiment provides a tundish argon gas replacement device, which comprises an air inlet pipe, a shunt pipe 3 connected with the air inlet pipe and an air outlet pipe connected with the shunt pipe 3;
the air inlet pipe comprises a horizontal section 1 and a vertical section 2, and the tail end of the horizontal section 1 is connected with the head end of the vertical section 2; the shunt tube 3 is connected with the tail end of the vertical section 2;
the included angle between the central line of the shunt tube 3 and the central line of the vertical section 2 is 94 degrees, and the shunt tube 3 and the air inlet tube are arranged in the same plane;
the air outlet pipe comprises a first air outlet pipe 4 and a second air outlet pipe 5; the first air outlet pipe 4 is connected with the middle section of the shunt pipe 3, and the included angle between the central line of the first air outlet pipe 4 and the central line of the shunt pipe 3 is 94 degrees; the second air outlet pipe 5 is connected with the tail end of the shunt pipe 3, and the included angle between the central line of the second air outlet pipe 5 and the central line of the shunt pipe 3 is 50 degrees; the shunt pipe 3, the air inlet pipe, the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on the same plane; the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on two sides of the shunt pipe 3; the distance between the first air outlet pipe 4 and the tail end of the shunt pipe 3 is 0.275 m;
the length of the horizontal section 1 is 3.95 m; the length of the vertical section 2 is 0.105 m; the length of the shunt tube 3 is 0.825 m; the length of the first air outlet pipe 4 is 0.18 m; the length of the second air outlet pipe 5 is 0.11 m; the diameters of the first air outlet pipe 4 and the second air outlet pipe 5 are 0.026 m.
Example 3
The embodiment provides a tundish argon gas replacement device, which comprises an air inlet pipe, a shunt pipe 3 connected with the air inlet pipe and an air outlet pipe connected with the shunt pipe 3;
the air inlet pipe comprises a horizontal section 1 and a vertical section 2, and the tail end of the horizontal section 1 is connected with the head end of the vertical section 2; the shunt tube 3 is connected with the tail end of the vertical section 2;
the included angle between the central line of the shunt tube 3 and the central line of the vertical section 2 is 91 degrees, and the shunt tube 3 and the air inlet tube are arranged on the same plane;
the air outlet pipe comprises a first air outlet pipe 4 and a second air outlet pipe 5; the first air outlet pipe 4 is connected with the middle section of the shunt pipe 3, and the included angle between the central line of the first air outlet pipe 4 and the central line of the shunt pipe 3 is 92 degrees; the second air outlet pipe 5 is connected with the tail end of the shunt pipe 3, and the included angle between the central line of the second air outlet pipe 5 and the central line of the shunt pipe 3 is 40 degrees; the shunt pipe 3, the air inlet pipe, the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on the same plane; the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on two sides of the shunt pipe 3; the distance between the first air outlet pipe 4 and the tail end of the shunt pipe 3 is 0.225 m;
the length of the horizontal section 1 is 3.05 m; the length of the vertical section 2 is 0.095 m; the length of the shunt tube 3 is 0.675 m; the length of the first air outlet pipe 4 is 0.12 m; the length of the second air outlet pipe 5 is 0.09 m; the diameters of the first air outlet pipe 4 and the second air outlet pipe 5 are 0.024 m.
Example 4
The embodiment provides a tundish argon replacing device, which comprises an air inlet pipe, a shunt pipe 3 connected with the air inlet pipe and an air outlet pipe connected with the shunt pipe 3;
the air inlet pipe comprises a horizontal section 1 and a vertical section 2, and the tail end of the horizontal section 1 is connected with the head end of the vertical section 2; the shunt tube 3 is connected with the tail end of the vertical section 2;
the included angle between the central line of the shunt pipe 3 and the central line of the vertical section 2 is 95 degrees, and the shunt pipe 3 and the air inlet pipe are arranged in the same plane;
the air outlet pipe comprises a first air outlet pipe 4 and a second air outlet pipe 5; the first air outlet pipe 4 is connected with the middle section of the shunt pipe 3, and the included angle between the central line of the first air outlet pipe 4 and the central line of the shunt pipe 3 is 95 degrees; the second air outlet pipe 5 is connected with the tail end of the shunt pipe 3, and the included angle between the central line of the second air outlet pipe 5 and the central line of the shunt pipe 3 is 60 degrees; the shunt pipe 3, the air inlet pipe, the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on the same plane; the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on two sides of the shunt pipe 3; the distance between the first air outlet pipe 4 and the tail end of the shunt pipe 3 is 0.3 m;
the length of the horizontal section 1 is 4.4 m; the length of the vertical section 2 is 0.11 m; the length of the shunt pipe 3 is 0.9 m; the length of the first air outlet pipe 4 is 0.2 m; the length of the second air outlet pipe 5 is 0.12 m; the diameters of the first air outlet pipe 4 and the second air outlet pipe 5 are 0.027 m.
Example 5
The embodiment provides a tundish argon gas replacement device, which comprises an air inlet pipe, a shunt pipe 3 connected with the air inlet pipe and an air outlet pipe connected with the shunt pipe 3;
the air inlet pipe comprises a horizontal section 1 and a vertical section 2, and the tail end of the horizontal section 1 is connected with the head end of the vertical section 2; the shunt tube 3 is connected with the tail end of the vertical section 2;
the included angle between the central line of the shunt pipe 3 and the central line of the vertical section 2 is 90 degrees, and the shunt pipe 3 and the air inlet pipe are arranged in the same plane;
the air outlet pipe comprises a first air outlet pipe 4 and a second air outlet pipe 5; the first air outlet pipe 4 is connected with the middle section of the shunt pipe 3, and the included angle between the central line of the first air outlet pipe 4 and the central line of the shunt pipe 3 is 90 degrees; the second air outlet pipe 5 is connected with the tail end of the shunt pipe 3, and the included angle between the central line of the second air outlet pipe 5 and the central line of the shunt pipe 3 is 30 degrees; the shunt pipe 3, the air inlet pipe, the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on the same plane; the first air outlet pipe 4 and the second air outlet pipe 5 are arranged on two sides of the shunt pipe 3; the distance between the first air outlet pipe 4 and the tail end of the shunt pipe 3 is 0.2 m;
the length of the horizontal section 1 is 2.6 m; the length of the vertical section 2 is 0.09 m; the length of the shunt pipe 3 is 0.6 m; the length of the first air outlet pipe 4 is 0.1 m; the length of the second air outlet pipe 5 is 0.08 m; the diameters of the first air outlet pipe 4 and the second air outlet pipe 5 are 0.023 m.
Example 6
This embodiment provides a tundish argon gas displacement device, which is the same as embodiment 1 except that the included angle between the center line of the first outlet pipe 4 and the center line of the shunt pipe 3 is 85 °.
Example 7
This embodiment provides a tundish argon gas replacement device, which is the same as embodiment 1 except that the included angle between the center line of the second outlet pipe 5 and the center line of the shunt pipe 3 is 70 °.
Example 8
This example provides a tundish argon gas displacement device, which is the same as example 1 except that the included angle between the center line of the second outlet pipe 5 and the center line of the shunt pipe 3 is 20 °.
Example 9
This embodiment provides a middle package argon gas replacement device, except that not set up first outlet duct 4, all the other is the same with embodiment 1.
Application example 1
The application example provides a method for replacing argon by using the tundish argon replacement device provided in embodiment 1, and the replacement method includes the following steps:
fixing a tundish argon gas replacement device at the edge of one side of a tundish 6 cladding impact area 7 shown in figure 2; when the tundish 6 runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the gas outlet pressure of the argon displacement device is 0.27MPa, and the argon flow is 30L/min; the first molten steel was poured for 5 minutes, and the argon replacement device was closed by adding a covering agent to the tundish 6.
Application example 2
The application example provides a method for replacing argon by using the tundish argon replacement device provided in embodiment 1, and the replacement method includes the following steps:
fixing a tundish argon displacement device at the edge of one side of a tundish 6 cladding impact area 7; when the tundish 6 runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the outlet pressure of the argon displacement device is 0.3MPa, and the argon flow is 35L/min; the first-furnace molten steel was poured for 4.5 minutes, and a covering agent was added to the tundish 6, and the argon gas replacement device was closed.
Application example 3
The application example provides a method for replacing argon by using the tundish argon replacement device provided in embodiment 1, and the replacement method includes the following steps:
fixing a tundish argon displacement device at the edge of one side of a tundish 6 cladding impact area 7; when the tundish 6 runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the gas outlet pressure of the argon displacement device is 0.24MPa, and the argon flow is 25L/min; the first molten steel was poured for 5.5 minutes, and the argon replacement device was closed by adding a covering agent to the tundish 6.
Application example 4
The application example provides a method for replacing argon by using the tundish argon replacement device provided in embodiment 1, and the replacement method includes the following steps:
fixing a tundish argon displacement device at the edge of one side of a tundish 6 cladding impact area 7; when the tundish 6 runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the outlet pressure of the argon displacement device is 0.34MPa, and the argon flow is 40L/min; the first-furnace molten steel was poured for 4 minutes, and a covering agent was added to the tundish 6, and the argon gas replacement device was closed.
Application example 5
The application example provides a method for replacing argon by using the tundish argon replacement device provided in embodiment 1, and the replacement method includes the following steps:
fixing a tundish argon displacement device at the edge of one side of a tundish 6 cladding impact area 7; when the tundish 6 runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the gas outlet pressure of the argon displacement device is 0.2MPa, and the argon flow is 20L/min; the first molten steel was poured for 6 minutes, and the argon replacement device was closed by adding a covering agent to the tundish 6.
Application example 6
The application example provides a method for replacing argon by using the tundish argon replacement device provided in the embodiment 1, wherein the outlet pressure of the argon replacement device in the replacement method is 0.15MPa, the argon flow is 15L/min, and the rest is the same as that in the application example 1.
Application example 7
The application example provides a method for replacing argon by using the tundish argon replacement device provided in the application example 1, wherein except that the outlet pressure of the argon replacement device is 0.4MPa, the flow rate of the argon is 45L/min, and the rest is the same as that of the application example 1.
Application example 8
The present application example provides a method of performing argon replacement using the tundish argon replacement apparatus provided in application example 2, and the steps of the replacement method are the same as those of application example 1.
Application example 9
The present application example provides a method for replacing argon gas by using the tundish argon gas replacement device provided in application example 3, and the steps of the replacement method are the same as those in application example 1.
Application example 10
The present application example provides a method of performing argon replacement using the tundish argon replacement apparatus provided in application example 4, and the steps of the replacement method are the same as those of application example 1.
Application example 11
The present application example provides a method for replacing argon gas by using the tundish argon gas replacement device provided in application example 5, and the steps of the replacement method are the same as those in application example 1.
Application example 12
The present application example provides a method of argon replacement using the tundish argon replacement apparatus provided in application example 6, and the steps of the replacement method are the same as those of application example 1.
Application example 13
This application example provides a method of argon replacement using the tundish argon replacement apparatus provided in application example 7, and the steps of the replacement method are the same as those in application example 1.
Application example 14
The present application example provides a method of performing argon replacement using the tundish argon replacement apparatus provided in application example 8, and the steps of the replacement method are the same as those of application example 1.
Application example 15
This application example provides a method of performing argon gas replacement using the tundish argon gas replacement device provided in application example 9, in the replacement method, only argon gas replacement is performed inside the impact region, and the rest is the same as in application example 1.
By applying the replacement method provided in application examples 1 to 15 of the present invention, argon replacement was performed inside the impact zone of the cast first furnace tundish and around the molten steel channel, and the nitrogen increase and the aluminum burnout of the first furnace casting blank were examined, with the results shown in table 1.
TABLE 1
| Increase in Nitrogen (%) | Aluminum burning loss (%) | |
| Application example 1 | 0.0002 | 0.001 |
| Application example 2 | 0.00024 | 0.0013 |
| Application example 3 | 0.00026 | 0.0015 |
| Application example 4 | 0.00032 | 0.0018 |
| Application example 5 | 0.00035 | 0.0019 |
| Application example 6 | 0.00041 | 0.0024 |
| Application example 7 | 0.00039 | 0.0022 |
| Application example 8 | 0.00027 | 0.0012 |
| Application example 9 | 0.00025 | 0.0014 |
| Application example 10 | 0.00031 | 0.002 |
| Application example 11 | 0.00034 | 0.0021 |
| Application example 12 | 0.00045 | 0.0028 |
| Application example 13 | 0.00043 | 0.0026 |
| Application example 14 | 0.00039 | 0.0025 |
| Application example 15 | 0.0005 | 0.003 |
Compared with the application examples 2-5, the application example 1 has certain influence on the argon blowing effect of the argon replacement device, the argon blowing effect of an argon blowing area can be ensured within a proper range, the nitrogen increment of the obtained casting blank is low, and the aluminum burning loss is reduced;
as can be seen from comparison of application examples 1, 6, and 7, the argon gas replacement device has an excessively small argon gas flow, poor argon blowing effect, an excessively large argon gas flow, and an excessively high flow rate, which adversely affects molten steel, increases the nitrogen increase amount of the obtained cast slab, and increases the aluminum burning loss amount;
compared with the application examples 8-11, the application example 1 has a large influence on the argon blowing effect of the argon replacing device by the connecting angle between the air outlet pipe and the flow dividing pipe, and the appropriate connecting angle range can ensure the argon blowing effect of the argon blowing area;
compared with the application examples 12 and 13, the application examples 1, 12 and 13 show that the connection angles of the first air outlet pipe, the second air outlet pipe and the shunt pipe exceed a proper range, and the argon can blow away steel materials and generate negative influence on the quality of molten steel; compared with the application example 14, the application example 1 shows that the included angle between the second air outlet pipe and the flow dividing pipe is too small, and the argon blowing effect is relatively reduced; as is clear from comparison between application examples 1 and 15, when the first outlet pipe is not provided in the tundish argon gas replacement device, only the replacement of argon gas in the impact region can be achieved, and the molten steel is still contaminated by air around the molten steel passage, which leads to an increase in the amount of nitrogen in the obtained cast slab and an increase in the amount of aluminum burning.
In conclusion, the argon replacement device is fixed in the tundish impact area to protect the inner part of the tundish impact area and the periphery of a molten steel channel, so that the pollution of the cast first furnace molten steel is reduced, the quality of the molten steel is improved, the nitrogen increment of a casting blank of the first furnace is less than or equal to 0.0005%, the aluminum burning loss is less than or equal to 0.003%, and the average service life of a refractory working layer of the tundish can be prolonged to be more than 4 h; the argon replacement device provided by the invention can be fixed at the edge of the intermediate cladding, and compared with a mobile argon blowing device, the argon blowing device is stable and uniform in argon blowing and convenient to operate.
The above description is only for the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure of the present invention.
Claims (10)
1. The tundish argon gas replacement device is characterized by comprising an air inlet pipe, a flow dividing pipe connected with the air inlet pipe and an air outlet pipe connected with the flow dividing pipe;
the air inlet pipe comprises a horizontal section and a vertical section, and the tail end of the horizontal section is connected with the head end of the vertical section;
the shunt tube is connected with the tail end of the vertical section.
2. The tundish argon displacement device of claim 1, wherein the centerline of the shunt tube makes an angle of 90-95 ° with the centerline of the vertical section;
preferably, the shunt tube is arranged in the same plane with the intake tube.
3. The tundish argon gas displacement device according to claim 1 or 2, wherein the outlet pipe comprises a first outlet pipe and a second outlet pipe;
preferably, the first air outlet pipe is connected with the middle section of the shunt pipe, and the included angle between the central line of the first air outlet pipe and the central line of the shunt pipe is 90-95 degrees;
preferably, the second air outlet pipe is connected with the tail end of the shunt pipe, and the included angle between the central line of the second air outlet pipe and the central line of the shunt pipe is 30-60 degrees.
4. The tundish argon gas displacement device of claim 3, wherein the shunt tube, the gas inlet tube, the first gas outlet tube and the second gas outlet tube are arranged in the same plane;
preferably, the first air outlet pipe and the second air outlet pipe are arranged on two sides of the shunt pipe;
preferably, the distance between the first air outlet pipe and the tail end of the shunt pipe is (0.2-0.3) x d; wherein d is the width of the impact zone in the tundish.
5. A tundish argon gas displacement apparatus according to claim 3 or claim 4, wherein the length of the horizontal section is (0.4-0.6) x (L-d); wherein L is the cladding length of the tundish and d is the width of an impact area in the tundish;
preferably, the length h of the vertical segment is (0.9-1.1) × h1(ii) a Wherein h is1The distance between the upper edge of the impact area in the tundish and the upper edge of the cladding of the tundish is set;
preferably, the length of the shunt tube is (0.7-0.8) x d; wherein d is the width of the impact zone in the tundish;
preferably, the length of the first air outlet pipe is 0.1-0.2 m;
preferably, the length of the second air outlet pipe is 0.08-0.12 m.
6. The tundish argon displacement device of claim 5, wherein the tundish envelope length L is 6-10 m;
preferably, the width d of the impact zone is between 0.8 and 1.2 m;
preferably, the distance h between the upper edge of the impact area in the tundish and the upper edge of the cladding of the tundish1Is 0.09-0.11 m.
7. A tundish argon displacement device according to any one of claims 3 to 6, wherein the ratio of the length of the horizontal section to the length of the vertical section is (29-40): 1;
preferably, the length ratio of the horizontal section to the shunt tube is (4.3-4.9): 1;
preferably, the diameters of the first air outlet pipe and the second air outlet pipe are 0.023-0.027 m.
8. A displacement method using the tundish argon displacement apparatus of any one of claims 1-7, wherein the displacement method comprises the steps of: fixing a tundish argon displacement device at the edge of one side of a tundish cladding impact area; when the tundish runs to the steel bearing position, opening the argon replacement device to perform argon replacement; and (4) allowing the first furnace molten steel to flow for 4-6 minutes, adding a covering agent into the tundish, and closing the argon replacement device.
9. The displacement method according to claim 8, wherein the outlet pressure of the argon displacement device is 0.2-0.34 MPa;
preferably, the argon gas flow rate of the argon gas replacement device is 20-40L/min.
10. A permutation method according to claim 8 or 9, characterized in that it comprises the steps of: fixing a tundish argon displacement device at the edge of one side of a tundish cladding impact area; when the tundish runs to a steel bearing position, opening an argon displacement device for argon displacement, wherein the outlet pressure of the argon displacement device is 0.2-0.34MPa, and the argon flow is 20-40L/min; and (4) allowing the first furnace molten steel to flow for 4-6 minutes, adding a covering agent into the tundish, and closing the argon replacement device.
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