CN117867215A - Bottom blowing structure and process for non-return steel leakage-proof converter - Google Patents
Bottom blowing structure and process for non-return steel leakage-proof converter Download PDFInfo
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- CN117867215A CN117867215A CN202311781335.7A CN202311781335A CN117867215A CN 117867215 A CN117867215 A CN 117867215A CN 202311781335 A CN202311781335 A CN 202311781335A CN 117867215 A CN117867215 A CN 117867215A
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- 238000007664 blowing Methods 0.000 title claims abstract description 106
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000009423 ventilation Methods 0.000 claims abstract description 124
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000003723 Smelting Methods 0.000 claims abstract description 33
- 229910052786 argon Inorganic materials 0.000 claims abstract description 26
- 239000011449 brick Substances 0.000 claims abstract description 18
- 239000007789 gas Substances 0.000 claims description 154
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000002265 prevention Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 description 15
- 230000008595 infiltration Effects 0.000 description 12
- 238000001764 infiltration Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 230000000149 penetrating effect Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a bottom blowing structure of a converter for preventing reverse leakage of steel and a process thereof, comprising a reverse leakage prevention valve, a ventilation core seat brick body, a ventilation core air charging pipe and a limiting buckle, wherein the ventilation core is fixed at the bottom of the converter through the ventilation core seat brick body, the bottom of the ventilation core is connected with the ventilation core air charging pipe, the ventilation core air charging pipe is communicated with an air source outside the converter, the reverse leakage prevention valve is arranged at the top of the ventilation core, a plurality of ventilation pipes are arranged on the side wall of the reverse leakage prevention valve along the circumferential direction, when the reverse leakage prevention valve is located at the top of the ventilation core, the ventilation pipes are in sealing connection with the side surface of the ventilation core, when the reverse leakage prevention valve leaves the top of the ventilation core, the ventilation pipes are mutually communicated with the ventilation core, and the limiting buckle is fixed on the ventilation core, and when the reverse leakage prevention valve is jacked up by air flow, the limiting buckle limits the reverse leakage prevention valve from the top of the ventilation core. According to the invention, argon is saved and smelting efficiency is improved while molten steel leaks from the ventilation core in the smelting process of the converter.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a bottom blowing structure and a bottom blowing process of a converter for preventing reverse leakage steel.
Background
The converter ventilation core brick is a conical object with an outer 2mm thick steel shell, an inner gas-containing core, chrome corundum material and an air bag at the bottom, is arranged at the bottom of the converter, and can be used for stirring the molten steel in the smelting process of the converter by argon, so that the smelting purposes of uniform temperature, components, floating inclusion and the like of the molten steel are realized. However, as the ventilation core has a certain porosity, once the flow of argon fluctuates and even when the gas is stopped due to the shortage of argon, high-temperature molten steel flows out along the ventilation core, so that serious steel leakage safety accidents are caused, and great economic loss is caused. Therefore, the prevention of the leakage of the molten steel from the ventilation core in the converter smelting process is an important link of metallurgical safety production, and how to thoroughly avoid the leakage of the molten steel from the ventilation core in the converter smelting process is a technical problem which is long plagued in the steel industry, and has become a constraint factor for smelting special steel and excellent steel in the converter.
The conventional converter bottom blowing ventilation core can not stop blowing gas, is easy to cause steel leakage accidents, causes potential safety hazards, and causes the problems that the subsequent production rhythm can not be smooth, so that the steel cost is increased and the like. And related process technology for preventing molten steel from leaking from the ventilation core in the converter smelting process has not been reported so far.
Disclosure of Invention
The invention provides a bottom blowing structure and a process for a non-return and anti-leakage converter, and provides a bottom blowing ventilation core and a non-return and anti-leakage converter bottom blowing process for a non-return and anti-leakage converter, which have simple structures and low cost from the perspective of preventing molten steel from leaking from a ventilation core and improving the ventilation argon blowing stirring effect of the ventilation core in the converter smelting process. The method can thoroughly prevent molten steel from leaking from the ventilation core in the converter smelting process, improve the dynamic conditions of argon blowing and stirring, save bottom argon blowing and improve smelting efficiency.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the utility model provides a structure is blown at converter bottom that non-contrary leak protection was steel, includes non-contrary leak protection valve, ventilative core seat brick body, ventilative core gas tube, spacing buckle, ventilative core passes through ventilative core seat brick body to be fixed in the bottom of converter, ventilative core gas tube is connected to ventilative core bottom, ventilative core gas tube accesss to the converter external connection air supply, non-contrary leak protection valve sets up at the top of ventilative core, the lateral wall of non-contrary leak protection valve is equipped with a plurality of breather pipe along circumference, when non-contrary leak protection valve sits at ventilative core top, breather pipe and ventilative core side sealing connection, when non-contrary leak protection valve leaves ventilative core top, breather pipe and ventilative core intercommunicate, spacing buckle is fixed on ventilative core, when non-contrary leak protection valve is by the air current jack-up, spacing buckle is spacing to prevent non-contrary leak protection valve from dropping from ventilative core top.
The breathable core comprises a breathable core extension tube and a breathable core lower portion, the breathable core lower portion is arranged at the upper end of the breathable core, and the breathable core lower portion is buried in the breathable core seat brick body.
The lower part of the ventilation core is conical with a small upper part and a large lower part.
A plurality of sealing rings are arranged between the non-return leakage-proof valve and the ventilation core.
And a sealing ring is arranged at the sealing connection part of the side surface of the ventilation pipe and the side surface of the ventilation core, and the sealing ring is fixed on the ventilation core.
The number of the ventilation pipes is 2-4, and the ventilation pipes are uniformly distributed along the circumference of the non-return leakage-proof valve.
A bottom blowing process of a converter bottom blowing structure utilizing non-return anti-leakage steel specifically comprises the following steps:
1) In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the ventilation core through the ventilation core air charging pipe, the non-return leakage-proof valve is lifted firstly, and after passing through the ventilation core extension pipe and the ventilation pipe, the gas enters molten steel and floats upwards, and the molten steel is stirred, so that the gas is saved, and the non-return leakage-proof effect is achieved; meanwhile, the valve is limited by the limiting buckle to prevent the non-return leakage-proof valve from falling out due to overlarge gas flow;
2) In the converter smelting process, when bottom blowing gas is not needed, the bottom blowing gas pressure is firstly increased at the end of bottom blowing, then the high-pressure gas flow is gradually reduced until the gas flow is 0, and the non-return leakage-proof valve stably covers the vent pipe and the ventilation core extension pipe under the action of gravity and the micro-convex sealing ring, so that the non-return leakage-proof valve plays a role in saving gas and simultaneously preventing non-return leakage.
In the initial stage of bottom blowing, the working pressure of the bottom blowing gas is 0.5-2.0 Mpa, and the air supply strength is 0.03-0.15 Nm 3 The valve is used for quickly jacking up the non-return and leakage-proof valve at the moment of opening the valve, so that high-pressure gas instantaneously passes through the vent pipe to flush out trace molten steel in the vent pipe, and the infiltration of the molten steel is prevented;
when ventilation is carried out for 3-7s, the non-return leakage-proof valve rises to the limit buckle and is limitedAnd (5) holding. At this time, the working pressure of the bottom blowing gas is controlled to be 0.3-1.2 Mpa, and the gas supply strength is controlled to be 0.04-0.09 Nm 3 T.min, entering a stable air supply stage; the air pressure is not large, but the flow is uniform and stable, and the infiltration of molten steel is prevented.
The gas flow rate at the end of bottom blowing is controlled in two stages, the working pressure of the bottom blowing gas at the first stage is raised on the basis of the pressure at the stable gas supply stage, the control pressure is 0.8-2.2 Mpa, and the gas supply intensity is 0.07-0.18 Nm 3 The purpose of the method is to flush out a minute amount of molten steel possibly remaining in the non-return leakage-proof valve and the vent pipe before closing the valve, thereby preventing infiltration of molten steel. After 4-7 s, the working pressure of the bottom blowing gas is regulated to be 0.2-1.1 Mpa, and the air supply intensity is regulated to be 0.03-0.08 Nm 3 And gradually reducing the air pressure and the air supply intensity, wherein the working pressure of the bottom blowing air is reduced by 0.2-0.4 Mpa/s, and the air supply intensity is reduced by 0.03-0.05 Nm 3 And/t.min until the gas is completely shut off. The non-return leak-proof valve and the slightly convex sealing ring stably cover the vent pipe and the ventilation core extension pipe under the action of gravity, thereby saving gas and playing the role of non-return leak-proof.
The stable gas supply period is 10-20min.
The bottom blowing gas is argon, nitrogen or oxygen.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention can ventilate when needing to blow out gas (argon, nitrogen and oxygen), the high-pressure gas slowly jack up the non-return leakage-proof valve, blow into the converter through the breather pipe, stir the molten steel; when the stirring of the gas (argon, nitrogen and oxygen) is not needed, the gas can be closed, and the vent pipe and the ventilation core extension pipe are stably sealed by the non-return leakage-proof valve and the micro-convex sealing ring under the action of gravity, so that the gas is saved by 40% -60%. Because of the existence of the sealing ring, the molten steel cannot enter the ventilation core in a countercurrent way, thereby playing a role in stopping the backflow and preventing steel leakage, saving a large amount of gas and reducing the production cost.
2) The invention can completely prevent molten steel from leaking from the ventilation core in the converter smelting process and improve the ventilation argon blowing stirring effect of the ventilation core, and simultaneously improve the dynamic conditions of blowing gas stirring, save 40% -60% of gas, improve the smelting efficiency, shorten the converter smelting time, reduce the labor cost and improve the international competitiveness of steel. The invention has important significance for breaking through the bottleneck of the non-return and anti-leakage steel process of the converter bottom blowing air-permeable core, laying the theoretical foundation of the novel non-return and anti-leakage steel process of the converter bottom blowing air-permeable core and industrialized application and improving the technical level of the non-return and anti-leakage steel process of the converter bottom blowing air-permeable core.
Drawings
Fig. 1 is a schematic view of a bottom blowing structure of a converter of the present invention for preventing a back-flow and a leakage of steel.
In the figure: 1-non-return leak-proof valve, 2-breather pipe, 3-sealing ring, 4-limit buckle, 5-ventilative core extension pipe, 6-ventilative core lower part, 7-ventilative core seat brick body, 8-converter bottom shell, 9-ventilative core gas tube.
Detailed Description
For further description of the present invention, the advantages and various effects of the present invention will be more clearly presented by the following detailed description of the present invention with reference to fig. 1 and the examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
See fig. 1, a structure is blown at converter bottom to non-contrary leak protection steel, including non-contrary leak protection valve 1, ventilative core seat brick body 7, ventilative core gas tube 9, spacing buckle 4, ventilative core passes through ventilative core seat brick body 7 to be fixed in the bottom of converter, ventilative core bottom connection ventilative core gas tube 9, ventilative core gas tube 9 leads to converter external connection air supply, non-contrary leak protection valve 1 sets up at the top of ventilative core, the lateral wall of non-contrary leak protection valve 1 is equipped with a plurality of breather pipe 2 along circumference, when non-contrary leak protection valve 1 sits at ventilative core top, breather pipe 2 and ventilative core side sealing connection, when non-contrary leak protection valve 1 leaves ventilative core top, spacing buckle 4 is fixed on ventilative core mutually, when non-contrary leak protection valve 1 is jacked by the air current, spacing buckle 4 is spacing to prevent that non-contrary leak protection valve 1 from falling off from ventilative core top.
The breathable core comprises a breathable core extension tube 5 and a breathable core lower portion 6, wherein the breathable core extension tube 5 is arranged at the upper end of the breathable core lower portion 6, and the breathable core lower portion 6 is buried in the breathable core seat brick body 7.
The lower part 6 of the ventilation core is conical with a small upper part and a large lower part.
A plurality of sealing rings 3 are arranged between the non-return leakage-proof valve 1 and the ventilation core.
The sealing ring 3 is arranged on the sealing joint of the side surface of the ventilation pipe 2 and the side surface of the ventilation core and the outer pipe wall of the ventilation core, and the sealing ring 3 is fixed on the ventilation core.
2-4 breather pipes 2 are evenly distributed along the circumference of the non-return leakage-proof valve 1.
The ventilating core extension tube 5 and the non-return leakage-proof valve 1 are made of chromium or tungsten.
The upper part of the ventilating core extension pipe 5 is provided with a slightly convex sealing ring 3 which plays a role in sealing and preventing high-pressure gas and molten steel from passing through.
The vent pipe 2 can be arranged at the upper part of the non-return leakage-proof valve 1, two vent pipes are distributed at 180 degrees in the inclined upward direction or three vent pipes are distributed at 120 degrees in the inclined upward direction or four vent pipes are distributed at 90 degrees in the inclined upward direction; the two or three or four inclined downward 180 degrees are distributed at 180 degrees at the lower part of the non-return leakage-proof valve 1; or can be horizontally arranged in the middle of the non-return leakage-proof valve 1, two horizontally arranged at 180 degrees or three horizontally arranged at 120 degrees or four horizontally arranged at 90 degrees.
The lower part of the non-return leak-proof valve 1 is provided with a limiting buckle 4 for limiting the upward displacement of the non-return leak-proof valve 1, preventing the non-return leak-proof valve 1 from separating from the ventilating core extension tube 5 during argon blowing and preventing molten steel from penetrating due to too large gap.
The lower part 6 of the ventilation core is embedded in the brick body 7 of the ventilation core seat and is installed and fixed inside the outer shell 8 of the converter bottom.
The ventilation core seat brick body 7 with the ventilation core of the converter bottom is uniformly arranged and fixed on the converter bottom shell 8 in a 4-12-layer installation mode according to a circular ring shape or a square grid shape.
A bottom blowing process of a converter bottom blowing structure utilizing non-return anti-leakage steel specifically comprises the following steps:
1) In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the ventilation core through the ventilation core air charging pipe 9, the non-return leakage-proof valve 1 is lifted firstly, and after passing through the ventilation core extension pipe 9 and the ventilation pipe 2, the gas enters molten steel and floats upwards, and the molten steel is stirred, so that the gas is saved, and the non-return leakage-proof effect is achieved; meanwhile, the valve is limited by the limiting buckle 4 to prevent the non-return leakage-proof valve 1 from falling out due to overlarge gas flow;
2) In the converter smelting process, when bottom blowing gas is not needed, the bottom blowing gas pressure is firstly increased at the end of bottom blowing, then the high-pressure gas flow is gradually reduced until the gas flow is 0, and the non-return leakage-proof valve 1 stably covers and seals the vent pipe 2 and the ventilation core extension pipe 5 with the slightly convex sealing ring 3 under the action of gravity, so that the gas is saved, and the non-return leakage-proof effect is achieved.
In the initial stage of bottom blowing, the working pressure of the bottom blowing gas is 0.5-2.0 Mpa, and the air supply strength is 0.03-0.15 Nm 3 The valve is used for quickly jacking up the non-return leakage-proof valve 1 at the moment of valve opening, so that high-pressure gas instantaneously passes through the vent pipe 2 to flush out trace molten steel in the vent pipe 2, and the infiltration of molten steel is prevented;
when ventilation is carried out for 3-7s, the non-return leakage-proof valve rises to the limit buckle and is limited. At this time, the working pressure of the bottom blowing gas is controlled to be 0.3-1.2 Mpa, and the gas supply strength is controlled to be 0.04-0.09 Nm 3 T.min, entering a stable air supply stage; low air pressure but flowThe amount is uniform and stable, and the infiltration of molten steel is prevented.
The gas flow rate at the end of bottom blowing is controlled in two stages, the working pressure of the bottom blowing gas at the first stage is raised on the basis of the pressure at the stable gas supply stage, the control pressure is 0.8-2.2 Mpa, and the gas supply intensity is 0.07-0.18 Nm 3 The purpose of the present invention is to prevent infiltration of molten steel by flushing out a small amount of molten steel that may remain in the non-return leakage-proof valve 1 and the vent pipe 2 before closing the valve. After 4-7 s, the working pressure of the bottom blowing gas is regulated to be 0.2-1.1 Mpa, and the air supply intensity is regulated to be 0.03-0.08 Nm 3 And gradually reducing the air pressure and the air supply intensity, wherein the working pressure of the bottom blowing air is reduced by 0.2-0.4 Mpa/s, and the air supply intensity is reduced by 0.03-0.05 Nm 3 And/t.min until the gas is completely shut off. The non-return leak-proof valve 1 and the slightly convex sealing ring 3 stably cover and seal the vent pipe 2 and the ventilation core extension pipe 5 under the action of gravity, thereby saving gas and playing the role of non-return leak-proof.
The stable gas supply period is 10-20min.
The bottom blowing gas is argon, nitrogen or oxygen.
Example 1
The invention is applied to converter smelting production at the steelmaking department of a certain steel mill, and the specific scheme is as follows:
the converter bottom blowing structure for preventing reverse leakage consists of a reverse leakage-proof valve 1, a vent pipe 2, a sealing ring 3, a limiting buckle 4, a ventilating core extension pipe 5, a ventilating core lower part 6 and a ventilating core inflation pipe 9. The extension tube 5 of the breathable core and the non-return leakage-proof valve 1 are made of chromium. The non-return leakage-proof valve 1 is tightly connected with the ventilation core extension pipe 5, and the upper part of the ventilation core extension pipe 5 is provided with a slightly convex sealing ring 3, which plays a role in sealing and preventing the passing of argon and molten steel.
The non-return leak-proof valve 1 is provided with 2 vent pipes 2, the number of the vent pipes 2 is 2, the vent pipes 2 can be arranged at the upper part of the non-return leak-proof valve 1, and two vent pipes are distributed obliquely upwards at 180 degrees. The lower part of the non-return leak-proof valve 1 is provided with a limiting buckle 4 for limiting the upward displacement of the non-return leak-proof valve 1, preventing the non-return leak-proof valve 1 from separating from the ventilating core extension pipe 9 during argon blowing and preventing molten steel from penetrating due to too large gap. The lower part 6 of the ventilation core is embedded in the brick body 7 of the ventilation core seat, and is installed and fixed in the converter bottom shell 8, and is uniformly installed and fixed in a 4-layer installation mode in a circular ring shape.
In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the ventilation core through the ventilation core air charging pipe 9, the non-return leakage-proof valve 1 is lifted, and the gas enters molten steel and floats upwards after passing through the ventilation core and the ventilation pipe 2, so as to stir the molten steel. The gas is saved, and the non-return steel leakage prevention effect is achieved; meanwhile, the non-return leakage-proof valve 1 is limited by the limiting buckle 4, so that the non-return leakage-proof valve 1 is prevented from being separated due to overlarge gas flow, and the specific operation is as follows:
1) The working pressure of the bottom blowing gas is 0.5Mpa when the valve is just opened, and the gas supply intensity is 0.08Nm 3 The purpose of the valve is to quickly lift the non-return leakage-proof valve 1 at the moment of valve opening, to allow high-pressure gas to pass through the vent pipe 2 at the moment, to flush out a trace amount of molten steel in the vent pipe 2, and to prevent molten steel from penetrating.
2) When the non-return leak-proof valve 1 is raised to the limit buckle 4 and is limited, the working pressure of the bottom blowing gas is 0.3Mpa, and the gas supply strength is 0.04Nm 3 And (3) entering a stable gas supply stage, wherein the gas pressure is not large, but the flow is uniform and stable, so that the infiltration of molten steel is prevented.
In the converter smelting process, when bottom blowing gas (argon, nitrogen and oxygen) is not needed, the pressure of the bottom blowing gas is firstly increased, then the flow of high-pressure gas introduced into the ventilation core gas charging pipe 9 is gradually reduced until the flow of the gas is 0, the non-return leakage-proof valve 1 stably covers and seals the ventilation pipe 2 and the ventilation core extension pipe 5 with the micro-convex sealing ring 3 under the action of gravity, and the non-return leakage-proof steel is played while the gas is saved, and the concrete operation is as follows:
1) Before the valve is gradually closed, the working pressure of the bottom blowing gas is raised to 0.8MPa, and the gas supply strength is raised to 0.07Nm 3 The purpose of the present invention is to prevent infiltration of molten steel by flushing out a small amount of molten steel that may remain in the non-return leakage-proof valve 1 and the vent pipe 2 before closing the valve.
2) After the high pressure was maintained for 4 seconds, the working pressure of the bottom blowing gas was adjusted to 0.2MPa and the supply air strength was adjusted to 0.03Nm 3 /t·min, and gradually reducing the air pressure and the air supply intensity, wherein the working pressure of the bottom blowing air is reduced at 0.2MPa/s and the air supply intensity is reduced at 0.03Nm 3 And/t.min until the gas is completely shut off. The non-return leak-proof valve 1 and the slightly convex sealing ring 3 stably cover and seal the vent pipe 2 and the ventilation core extension pipe 5 under the action of gravity, thereby saving gas and playing the role of non-return leak-proof.
By applying the invention, the gas is saved by about 40%, the working efficiency and the production safety are improved, the production cost is reduced, and the international competitiveness of steel is improved.
Example 2
The invention is applied to converter smelting production at the steelmaking department of a certain steel mill, and the specific scheme is as follows:
the converter bottom blowing structure for preventing reverse leakage consists of a reverse leakage-proof valve 1, a vent pipe 2, a sealing ring 3, a limiting buckle 4, a ventilating core extension pipe 5, a ventilating core lower part 6 and a ventilating core inflation pipe 9. The ventilating core extension tube 5 and the non-return leakage-proof valve 1 are made of tungsten. The non-return leakage-proof valve 1 is tightly connected with the ventilation core extension pipe 5, and the upper part of the ventilation core extension pipe 5 is provided with a slightly convex sealing ring 3, which plays a role in sealing and preventing the passing of argon and molten steel.
The non-return leak-proof valve 1 is provided with 4 vent pipes 2, the vent pipes 2 are arranged at the lower part of the non-return leak-proof valve 1, and four vent pipes are obliquely arranged at 90 degrees downwards. The lower part of the non-return leak-proof valve 1 is provided with a limiting buckle 4 for limiting the upward displacement of the non-return leak-proof valve 1, preventing the non-return leak-proof valve 1 from separating from the ventilating core extension tube 5 during argon blowing and preventing molten steel from penetrating due to too large gap. The lower part 6 of the ventilation core is embedded in the ventilation core seat brick body 7 and is installed and fixed in the converter bottom shell 8, and is uniformly installed and fixed in a 12-layer installation mode according to a square grid shape.
In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the ventilation core through the ventilation core air charging pipe 9, the non-return leakage-proof valve 1 is lifted, and the gas enters molten steel and floats upwards after passing through the ventilation core and the ventilation pipe 2, so as to stir the molten steel. The gas is saved, and the non-return steel leakage prevention effect is achieved; meanwhile, the valve is limited by the limiting buckle 4 to prevent the non-return leakage-proof valve 1 from falling off due to overlarge gas flow, and the specific operation is as follows:
1) The working pressure of bottom blowing gas is 2.0MPa when the valve is just opened, and the gas supply intensity is 0.15Nm 3 The purpose of the valve is to quickly lift the non-return leakage-proof valve 1 at the moment of valve opening, to allow high-pressure gas to pass through the vent pipe 2 at the moment, to flush out a trace amount of molten steel in the vent pipe 2, and to prevent molten steel from penetrating.
(2) When the non-return leak-proof valve 1 is lifted to the limit buckle 4 and is limited, the working pressure of the bottom blowing gas is 1.2MPa, and the gas supply strength is 0.09Nm 3 And (3) entering a stable gas supply stage, wherein the gas pressure is not large, but the flow is uniform and stable, so that the infiltration of molten steel is prevented.
In the converter smelting process, when bottom blowing gas (argon, nitrogen and oxygen) is not needed, the pressure of the bottom blowing gas is firstly increased, then the flow of high-pressure gas introduced into the ventilation core gas charging pipe 9 is gradually reduced until the flow of the gas is 0, the non-return leakage-proof valve 1 stably covers and seals the ventilation pipe 2 and the ventilation core extension pipe 5 with the micro-convex sealing ring 3 under the action of gravity, and the non-return leakage-proof valve plays a role in saving gas and simultaneously playing a role in non-return leakage-proof; the specific operation is as follows:
1) Before the valve is gradually closed, the working pressure of the bottom blowing gas is raised to 2.2MPa, and the gas supply strength is raised to 0.18Nm 3 The purpose of the present invention is to prevent infiltration of molten steel by flushing out a small amount of molten steel that may remain in the non-return leakage-proof valve 1 and the vent pipe 2 before closing the valve.
2) After holding for 7s, the working pressure of the bottom blowing gas was adjusted to 1.1MPa and the supply air strength was adjusted to 0.08Nm 3 And gradually reducing the air pressure and the air supply intensity, wherein the working pressure of the bottom blowing air is reduced at 0.4Mpa/s and the air supply intensity is reduced at 0.05Nm 3 And/t.min until the gas is completely shut off. The non-return leakage-proof valve 1 and the slightly convex sealing ring 3 stably cover and seal the vent pipe 2 and the ventilation core extension pipe 5 under the action of gravity, so that the non-return leakage-proof valve has the function of non-return leakage-proof while saving gas;
the gas is saved by about 60% by using the invention, the working efficiency and the production safety are improved, the production cost is reduced, and the international competitiveness of steel is improved.
Example 3
The invention is applied to converter smelting production at the steelmaking department of a certain steel mill, and the specific scheme is as follows:
the converter bottom blowing structure for preventing reverse leakage consists of a reverse leakage-proof valve 1, a vent pipe 2, a sealing ring 3, a limiting buckle 4, a ventilating core extension pipe 5, a ventilating core lower part 6 and a ventilating core inflation pipe 9. The ventilating core extension tube 5 and the non-return leakage-proof valve 1 are made of tungsten. The non-return leakage-proof valve 1 is tightly connected with the ventilation core extension pipe 5, and the upper part of the ventilation core extension pipe 5 is provided with a slightly convex sealing ring 3, which plays a role in sealing and preventing the passing of argon and molten steel.
The non-return leak-proof valve 1 is provided with 4 vent pipes 2, the vent pipes 2 are arranged at the lower part of the non-return leak-proof valve 1, and four vent pipes are obliquely arranged at 90 degrees downwards. The lower part of the non-return leak-proof valve 1 is provided with a limiting buckle 4 for limiting the upward displacement of the non-return leak-proof valve 1, preventing the non-return leak-proof valve 1 from separating from the ventilating core extension tube 5 during argon blowing and preventing molten steel from penetrating due to too large gap. The lower part 6 of the ventilation core is embedded in the brick body 7 of the ventilation core seat, and is installed and fixed in the converter bottom shell 8, and is uniformly installed and fixed in a 7-layer installation mode according to a square grid shape.
In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the ventilation core through the ventilation core air charging pipe 9, the non-return leakage-proof valve 1 is lifted, and the gas enters molten steel and floats upwards after passing through the ventilation core and the ventilation pipe 2, so as to stir the molten steel. The gas is saved, and the non-return steel leakage prevention effect is achieved; meanwhile, the non-return leakage-proof valve 1 is limited by the limiting buckle 4, so that the non-return leakage-proof valve 1 is prevented from being separated due to overlarge gas flow, and the specific operation is as follows:
1) The working pressure of the bottom blowing gas is 1.0Mpa when the valve is just opened, and the gas supply intensity is 0.11Nm 3 The purpose of the valve is to quickly lift the non-return leakage-proof valve 1 at the moment of valve opening, to allow high-pressure gas to pass through the vent pipe 2 at the moment, to flush out a trace amount of molten steel in the vent pipe 2, and to prevent molten steel from penetrating.
2) When the non-return leak-proof valve 1 is raised to the limit buckle 4 and is limited, the working pressure of the bottom blowing gas is 0.9Mpa, and the gas supply strength is 0.06Nm 3 /t·min, entering a stable gas supply stage, the gas pressure is not large, but the flow is uniform and stable, and the infiltration of molten steel is prevented.
In the converter smelting process, when bottom blowing gas (argon, nitrogen and oxygen) is not needed, the pressure of the bottom blowing gas is firstly increased, then the flow of high-pressure gas introduced into the ventilation core gas charging pipe 9 is gradually reduced until the flow of the gas is 0, the non-return leakage-proof valve 1 stably covers and seals the ventilation pipe 2 and the ventilation core extension pipe 5 with the micro-convex sealing ring 3 under the action of gravity, and the non-return leakage-proof valve plays a role in saving gas and simultaneously playing a role in non-return leakage-proof; the specific operation is as follows:
1) Before the valve is gradually closed, the working pressure of the bottom blowing gas is increased to 1.5Mpa, and the gas supply strength is increased to 0.11Nm 3 The purpose of the present invention is to prevent infiltration of molten steel by flushing out a small amount of molten steel that may remain in the non-return leakage-proof valve 1 and the vent pipe 2 before closing the valve.
2) After maintaining the high pressure for 5s, the working pressure of the bottom blowing gas is adjusted to 0.9Mpa, and the air supply intensity is adjusted to 0.04Nm 3 And gradually reducing the air pressure and the air supply intensity, wherein the working pressure of the bottom blowing air is reduced by 0.3Mpa/s and the air supply intensity is reduced by 0.04Nm 3 And/t.min until the gas is completely shut off. The non-return leakage-proof valve 1 and the slightly convex sealing ring 3 stably cover and seal the vent pipe 2 and the ventilation core extension pipe 5 under the action of gravity, so that the non-return leakage-proof valve has the function of non-return leakage-proof while saving gas;
the gas is saved by about 65% by using the invention, the working efficiency and the production safety are improved, the production cost is reduced, and the international competitiveness of steel is improved.
The conventional converter bottom blowing ventilation core is adopted for production, argon cannot be blown off in the production process, steel leakage accidents are easy to occur, potential safety hazards are caused, the follow-up production rhythm is smooth, and therefore the steel cost is increased. According to comparison, the converter bottom blowing structure with the non-return anti-leakage steel and the use process thereof have the advantages of simple structure and low cost, and from the perspective of preventing molten steel from leaking from the ventilation core in the converter smelting process and improving the ventilation argon blowing stirring effect of the ventilation core, the dynamic conditions of argon blowing stirring can be improved while the molten steel from leaking from the ventilation core in the converter smelting process is thoroughly stopped, 40% -60% of gas is saved, the smelting efficiency is improved, the converter smelting time is shortened, the labor cost is reduced, and the international competitiveness of steel is improved. The invention has important significance for breaking through the bottleneck of the non-return and anti-leakage steel process of the converter bottom blowing air-permeable core, laying the theoretical foundation of the novel non-return and anti-leakage steel process of the converter bottom blowing air-permeable core and industrialized application and improving the technical level of the non-return and anti-leakage steel process of the converter bottom blowing air-permeable core.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, such as the number of ventilation holes, the angle of the interval of ventilation holes, etc., and are also within the spirit of the invention, and that the above described embodiments are modified and altered within the scope of the invention as claimed.
It should be understood that the endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and that the range or value is to be understood as encompassing values close to the range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, the term "and/or" appearing herein is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a structure is blown at converter bottom to non-contrary leak protection steel, its characterized in that includes non-contrary leak protection valve, ventilative core seat brick body, ventilative core gas tube, spacing buckle, ventilative core passes through ventilative core seat brick body to be fixed in the bottom of converter, ventilative core gas tube is connected to ventilative core bottom, ventilative core gas tube leads to the outside connection air supply of converter, non-contrary leak protection valve sets up at the top of ventilative core, the lateral wall of non-contrary leak protection valve is equipped with a plurality of breather pipe along circumference, when non-contrary leak protection valve sits at ventilative core top, breather pipe and ventilative core side sealing connection, when non-contrary leak protection valve leaves ventilative core top, breather pipe and ventilative core intercommunicate, spacing buckle is fixed on ventilative core, when non-contrary leak protection valve is by the air current jack-up, spacing buckle is spacing to prevent that non-contrary leak protection valve from falling from ventilative core top.
2. The structure of claim 1, wherein the ventilation core comprises a ventilation core extension pipe and a ventilation core lower part, the ventilation core extension pipe is arranged at the upper end of the ventilation core lower part, and the ventilation core lower part is buried in the ventilation core seat brick body.
3. The structure of claim 2, wherein the lower part of the ventilation core is tapered with a smaller top and a larger bottom.
4. The structure of claim 1, wherein a plurality of sealing rings are arranged between the non-return leakage-proof valve and the ventilation core.
5. The structure according to claim 4, wherein a sealing ring is provided at the sealing connection between the vent pipe and the side surface of the ventilation core, and the sealing ring is fixed on the ventilation core.
6. The bottom blowing structure of the non-return leak-proof steel converter of claim 1, wherein the number of the ventilation pipes is 2-4, and the ventilation pipes are uniformly distributed along the circumferential direction of the non-return leak-proof valve.
7. A bottom blowing process using the non-return and leak-proof converter bottom blowing structure according to any one of claims 1 to 6, characterized by comprising in particular:
1) In the converter smelting process, when bottom blowing gas is needed, high-pressure air flow is introduced into the air permeable core through the air permeable core air charging pipe, the non-return leakage-proof valve is lifted, and the gas enters molten steel and floats upwards after passing through the air permeable core and the air vent pipe, so as to stir the molten steel.
2) In the converter smelting process, when bottom blowing gas is not needed, the bottom blowing gas pressure is firstly increased at the end of bottom blowing, then the high-pressure gas flow is gradually reduced until the gas flow is 0, and the non-return leakage-proof valve is well sealed with the ventilation core under the action of gravity.
8. The bottom blowing process of the bottom blowing structure of the converter for preventing reverse leakage steel according to claim 7, wherein,
in the initial stage of bottom blowing, the working pressure of the bottom blowing gas is 0.5-2.0 Mpa, and the non-return leakage-proof valve is quickly jacked up to flush out molten steel in the vent pipe;
when ventilation is carried out for 3-7s, the working pressure of bottom blowing gas is reduced, the pressure is controlled to be 0.3-1.2 Mpa, and the stable gas supply stage is carried out;
the gas flow rate at the end of bottom blowing is controlled in two stages, the working pressure of bottom blowing gas at the first stage is raised on the basis of the pressure at the stable gas supply stage, the working pressure of the bottom blowing gas is regulated to be 0.2-1.1 Mpa after the control pressure is 0.8-2.2 Mpa and 4-7 s, and the gas pressure is gradually reduced, wherein the reducing speed of the working pressure of the bottom blowing gas is 0.2-0.4 Mpa/s until the gas is completely closed.
9. The bottom blowing process of a bottom blowing structure of a non-return and anti-leak steel converter according to claim 8, wherein the stable gas supply period is 10-20min.
10. The bottom blowing process of a bottom blowing structure of a non-return and leak-proof steel converter according to any one of claims 7 to 9, wherein the bottom blowing gas is argon or nitrogen or oxygen.
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| CN202311781335.7A CN117867215B (en) | 2023-12-22 | 2023-12-22 | Bottom blowing structure and process for non-return steel leakage-proof converter |
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| CN202311781335.7A CN117867215B (en) | 2023-12-22 | 2023-12-22 | Bottom blowing structure and process for non-return steel leakage-proof converter |
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| CN116426719A (en) * | 2023-06-12 | 2023-07-14 | 江苏徐钢钢铁集团有限公司 | Argon blowing device for manganese steel smelting ladle |
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| JP2005264259A (en) * | 2004-03-19 | 2005-09-29 | Jfe Steel Kk | Facility for supplying argon gas for blowing in converter |
| CN2910418Y (en) * | 2006-05-12 | 2007-06-13 | 濮阳濮耐高温材料有限公司 | Integral air permeable bricks for preventing molten steel from leakage and infiltration |
| CN201065417Y (en) * | 2007-06-15 | 2008-05-28 | 鞍钢股份有限公司 | Structure for preventing air brick cup from steel leakage |
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