CN220183323U - Slag overflow preventing and pressing gun device in VD treatment process - Google Patents
Slag overflow preventing and pressing gun device in VD treatment process Download PDFInfo
- Publication number
- CN220183323U CN220183323U CN202320615697.8U CN202320615697U CN220183323U CN 220183323 U CN220183323 U CN 220183323U CN 202320615697 U CN202320615697 U CN 202320615697U CN 220183323 U CN220183323 U CN 220183323U
- Authority
- CN
- China
- Prior art keywords
- section
- slag
- pressing gun
- slag pressing
- gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002893 slag Substances 0.000 title claims abstract description 87
- 238000003825 pressing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 239000013049 sediment Substances 0.000 claims description 5
- 239000012159 carrier gas Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000007872 degassing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000009489 vacuum treatment Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The utility model discloses a slag overflow preventing slag pressing gun device in a VD treatment process, which comprises a VD tank body (1), wherein an opening (1 a) is arranged at the top of the VD tank body, the slag pressing gun (2) comprises an air inlet section (21), a throat opening (22) and an air outlet section (23) which are sequentially connected, and the air outlet section (23) downwards passes through the opening (1 a) and is opposite to molten steel (5) in the VD tank body (1); the throat (22) is of a Laval nozzle structure and comprises a necking section (221), a straight pipe section (222) and a flaring section (223), the necking section (221) is connected with the air inlet section (21), the diameter of the necking section is gradually reduced from the air inlet section (21) to the straight pipe section (222), the flaring section (223) is connected with the air outlet section (23), and the diameter of the flaring section is gradually increased from the straight pipe section (222) to the air outlet section (23). The utility model has the advantages of improving the vacuum degree, controlling the gas content of the slag layer, promoting the gas overflow of the slag layer, reducing the liquid level and preventing the slag from overflowing.
Description
Technical Field
The utility model belongs to the technical field of refining smelting equipment, and particularly relates to a slag overflow preventing and pressing gun device in a VD treatment process.
Background
The vacuum degassing operation is an important component of a refining smelting process, VD is used as a vacuum treatment means, a high vacuum environment is mainly created in a closed tank body, slag layers are broken through argon stirring, the purpose of reducing the gas content in molten steel is achieved by dispersing steel grade gas into the vacuum environment, in the process, production and quality control risks caused by slag overflow in the stage of ensuring that VD enters a high vacuum degree are required to be effectively prolonged, the molten steel amount is reduced to ensure free space, the operation is ensured by repeatedly stopping and starting vacuum jet pumps of each grade, and the like, so that the production efficiency is influenced, the process is complicated and difficult to manage and control.
At present, in main production products of special steel production enterprises, the vacuum ratio is about 95%, wherein varieties H such as non-adjusting, drilling tools, grinding balls and the like have higher sensitivity, and VD vacuum treatment is an important component in the whole production process as a main means of degassing. In the traditional VD treatment process, along with the continuous reduction of the vacuum degree, gases in steel, mainly N, H, partial precipitated O and the like, are quickly dissipated from the inside to the outside of molten steel, and gas molecules can enter the vacuum environment and be removed after penetrating through a slag layer of about 14-18 cm firstly due to top slag isolation in the refining process. In the process, the slag foams because of containing a large amount of gas molecules, the volume can be rapidly and obviously increased, the peak value can be reached when the vacuum degree reaches about 60-80 mbar, the slag can be overflowed from the ladle edge when serious, accidents of an argon burning pipe are caused, and a large amount of slag can be lost at the same time.
Disclosure of Invention
The utility model aims to solve the problems of uncontrollable and poor effect of slag overflow prevention measures in the existing VD vacuum treatment, and provides a slag overflow prevention slag pressing gun device in the VD treatment process, which can assist in rapidly improving the vacuum degree, controlling the gas content of a slag layer, rapidly blowing out the slag surface outside an argon stirring position, promoting the gas overflow of the slag layer, achieving the effects of reducing the liquid level and preventing the slag overflow, and finally achieving the purpose of rapidly entering high vacuum for holding.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the device comprises a VD tank body, wherein an opening matched with a slag pressing gun is formed in the top of the VD tank body, a gun barrel of the slag pressing gun comprises an air inlet section, a throat opening and an air outlet section which are sequentially connected, an air inlet of the air inlet section is connected with an air delivery pipe, a broken air valve is connected to the air delivery pipe, and the air outlet section downwards passes through the opening and is opposite to molten steel in the VD tank body;
the slag pressing gun is obliquely downwards arranged, an included angle alpha is formed between the slag pressing gun and the horizontal gas pipe, the throat of the slag pressing gun is of a Laval nozzle structure, the slag pressing gun comprises a necking section, a straight pipe section and a flaring section which are sequentially connected, the necking section is connected with the gas inlet section of the slag pressing gun, the diameter of the necking section is gradually reduced from the gas inlet section to the straight pipe section, the flaring section is connected with the gas outlet section of the slag pressing gun, and the diameter of the flaring section is gradually increased from the straight pipe section to the gas outlet section, so that the gas flow jet speed of the slag pressing gun is increased.
Further, the gas outlet of the slag pressing gun is arranged opposite to the molten steel of the argon gas port in the VD tank body.
Further, a splash-proof cover is arranged above the molten steel, a through hole is formed in the splash-proof cover, and the lower end of the slag pressing gun penetrates through the through hole downwards.
Further, the included angle alpha is 120-135 degrees, so that the direction of the airflow is prevented from being directly rushed downwards.
Further, the diameters of the air inlet section and the air outlet section of the slag pressing gun are 35mm.
Further, the diameter of the straight pipe section of the throat is 18-20 mm.
Further, the carrier gas in the slag pressing gun is N 2 For maintaining the reducing atmosphere in the tank without damaging the environment in the tank by the slag pressing gun.
According to the technical scheme, the bottom stirring gas is regulated to expose the molten steel at the argon gas port, the molten steel enters the degassing process, when the vacuum degree reaches the boiling peak value of slag, the slag pressing gun is started before the molten steel surface rises to the ladle pressing brick, the molten slag layer is broken through the outlet air flow, the exposed degassing of the molten steel is promoted, the vacuum degree is regulated instantaneously and maintained near the reaction peak value, and the molten steel surface is closed after falling back. The process is repeated, so that the vacuum degree in the tank is kept in a non-slag overflowing state near a reaction peak value of less than 60mbar, the slag surface starts to be stable generally for about 3-4 minutes, and the fourth step and the fifth step can be started in sequence to enter a high vacuum maintaining stage. The device disclosed by the utility model is used for assisting in rapidly improving the vacuum degree, controlling the gas content of the slag layer, rapidly blowing the slag surface outside the argon stirring position, promoting the gas overflow of the slag layer, reducing the liquid level and effectively preventing the slag from overflowing.
Drawings
FIG. 1 is a schematic diagram showing the whole assembly of a slag-overflow-preventing slag-pressing gun device in the VD treatment process of the utility model;
FIG. 2 is a schematic diagram of the slag pressing gun according to the present utility model.
Detailed Description
Examples
In order that the utility model may be more clearly understood, a description of an apparatus for preventing overflow during a VD process according to the present utility model will be further provided with reference to the accompanying drawings, wherein the specific embodiments described herein are for illustration only and not for limitation.
Referring to fig. 1, a slag-overflow-preventing slag-pressing gun device in a VD treatment process comprises a VD tank body 1, and is characterized in that:
in fig. 1 and 2, an opening 1a which is matched with a slag pressing gun 2 is formed in the top of a VD tank body 1 at a moment, a gun barrel of the slag pressing gun 2 comprises an air inlet section 21, a throat 22 and an air outlet section 23 which are sequentially connected, an air inlet of the air inlet section 21 is connected with an air delivery pipe 3, an air breaking valve 4 is connected to the air delivery pipe 3, the air outlet section 23 penetrates through the opening 1a downwards, and an air outlet is arranged opposite to molten steel 5 of an argon gas port 6 in the VD tank body 1;
referring to fig. 1 and 2, the slag pressing gun 2 is arranged obliquely downwards, and an included angle alpha is formed between the slag pressing gun and the horizontal gas pipe 3, wherein alpha is 120-135 degrees, so that the slag pressing gun is used for preventing the direction of the gas flow from directly rushing downwards;
the throat 22 of the slag pressing gun 2 is of a Laval nozzle structure and comprises a necking section 221, a straight pipe section 222 and a flaring section 223 which are connected in sequence, wherein the necking section 221 is connected with the air inlet section 21 of the slag pressing gun 2, the diameter of the necking section is gradually reduced from the air inlet section 21 to the straight pipe section 222, the flaring section 223 is connected with the air outlet section 23 of the slag pressing gun 2, and the diameter of the flaring section is gradually increased from the straight pipe section 222 to the air outlet section 23 so as to be used for increasing the air flow speed of the slag pressing gun;
referring to fig. 1, a splash-proof cover 7 is arranged above the molten steel 5, a through hole 7a is arranged on the splash-proof cover 7, and the lower end of the slag pressing gun 2 passes through the through hole 7a downwards.
In this embodiment, the diameters of the air inlet section 21 and the air outlet section 23 of the slag pressing gun 2 are 35mm, the diameter of the straight pipe section 222 of the throat 22 is 18-20 mm, and the carrier gas is N2, so as to keep the reducing atmosphere in the tank environment from being damaged when entering the tank body through the slag pressing gun.
The original five-stage steam jet pump is started in sequence:
starting a processing program, covering the tank cover, and entering a first vacuum step according to the start and the first step;
when the vacuum degree is less than 200mBar, according to the second step, the second step of vacuum operation is carried out;
when the vacuum degree is less than 100mBar, according to the third step, the third step of vacuum operation is carried out;
after entering the third step, the argon gas port 6 is exposed by adjusting bottom stirring gas, and enters a degassing process, so that the phenomenon of boiling and foaming of smoke and slag occurs at the moment, when the vacuum degree reaches about 60mbar of a boiling peak value of slag, the clearance is about 200mm before the liquid level of the steel rises to a ladle mouth pressing brick, a slag pressing gun 2 is started, a molten slag layer is broken through utilizing outlet airflow, the exposed degassing of molten steel is promoted, the instantaneous vacuum degree adjustment is maintained near a reaction peak value, and the liquid level of the molten steel is closed after falling back; repeating the process to ensure that the vacuum degree in the tank is kept in a non-slag overflow state near a reaction peak value of less than 60 mbar; the slag surface starts to be stable after being maintained for about 3-4 min generally, and the fourth step and the fifth step can be started in sequence to enter a high vacuum maintaining stage.
In this embodiment, can follow the broken empty valve 4 of installation on the tank cap dolly, stretch into from tank deck upper portion trompil and press sediment rifle 2, broken empty valve 4 control button access master control room operation interface controls, observe jar internal liquid level condition in real time through high temperature camera, timely start and close and press the sediment rifle, because press the influence of the start of sediment rifle to the vacuum degree can monitor through the vacuum degree change of high vacuum gauge, the leakproofness of this system of periodic inspection, ensure that vacuum throughput is not influenced when causing to close
After the device is used, the time for entering high vacuum in the single-furnace VD process of the furnace is reduced by 3.5min averagely, the temperature loss is reduced by 5 ℃/furnace, the power consumption is reduced by 175 ℃, and the cost reduction benefit is 105 ten thousand yuan.
Due to the reduction of slag overflow at the ladle mouth, the steel ladle is reduced in the offline caused by the damage of the ladle mouth, the ladle age is averagely improved by 1 time, 150 new ladle bricks are built all around the year, and the cost is reduced by 2600 yuan/one for a single time, so that the ladle cost is reduced by about 39 ten thousand yuan all around the year.
In addition, as the slag overflow amount is reduced, the shutdown cleaning frequency of the VD tank body is reduced from 1 time/1 week to 1 time/12-15 days, and the cleaning cost can be reduced by 20 times per year, 1500 yuan=3 ten thousand yuan.
In addition to the embodiments described above, other embodiments of the utility model are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the utility model.
Claims (7)
1. The utility model provides a sediment rifle device is pressed to anti-overflow sediment in VD processing procedure, includes VD jar body (1), its characterized in that:
the top of the VD tank body (1) is provided with an opening (1 a) which is matched with the slag pressing gun (2), the gun barrel of the slag pressing gun (2) comprises an air inlet section (21), a throat opening (22) and an air outlet section (23) which are sequentially connected, an air inlet of the air inlet section (21) is connected with an air delivery pipe (3), the air delivery pipe (3) is connected with a breaking valve (4), and the air outlet section (23) downwards passes through the opening (1 a) and is opposite to molten steel (5) in the VD tank body (1);
the slag pressing gun (2) is obliquely downwards arranged, an included angle alpha is arranged between the slag pressing gun and the horizontal gas pipe (3), a throat (22) of the slag pressing gun (2) is of a Laval nozzle structure, the slag pressing gun comprises a necking section (221), a straight pipe section (222) and a flaring section (223) which are sequentially connected, the necking section (221) is connected with a gas inlet section (21) of the slag pressing gun (2), the diameter of the slag pressing gun is gradually reduced from the gas inlet section (21) to the straight pipe section (222), the flaring section (223) is connected with a gas outlet section (23) of the slag pressing gun (2), and the diameter of the slag pressing gun is gradually increased from the straight pipe section (222) to the gas outlet section (23).
2. The device for preventing overflow slag during VD treatment according to claim 1, wherein:
the gas outlet of the slag pressing gun (2) is arranged opposite to the molten steel (5) of the argon gas port (6) in the VD tank body (1).
3. The device for preventing overflow slag during VD treatment according to claim 1 or 2, wherein:
the upper part of the molten steel (5) is provided with a splash-proof cover (7), the splash-proof cover (7) is provided with a through hole (7 a), and the lower end of the slag pressing gun (2) passes through the through hole (7 a) downwards.
4. The device for preventing overflow slag during VD treatment according to claim 1 or 2, wherein:
the included angle alpha is 120-135 degrees.
5. The device for preventing overflow slag during VD treatment according to claim 1 or 2, wherein:
the diameters of the air inlet section (21) and the air outlet section (23) of the slag pressing gun (2) are 35mm.
6. The device for preventing overflow slag during VD treatment according to claim 1 or 2, wherein:
the diameter of the straight pipe section (222) of the throat (22) is 18-20 mm.
7. The device for preventing overflow slag during VD treatment according to claim 1 or 2, wherein:
the carrier gas in the slag pressing gun (2) is N 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320615697.8U CN220183323U (en) | 2023-03-27 | 2023-03-27 | Slag overflow preventing and pressing gun device in VD treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320615697.8U CN220183323U (en) | 2023-03-27 | 2023-03-27 | Slag overflow preventing and pressing gun device in VD treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220183323U true CN220183323U (en) | 2023-12-15 |
Family
ID=89103039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320615697.8U Active CN220183323U (en) | 2023-03-27 | 2023-03-27 | Slag overflow preventing and pressing gun device in VD treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220183323U (en) |
-
2023
- 2023-03-27 CN CN202320615697.8U patent/CN220183323U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109321699B (en) | Method for burning dead coke pile in tuyere area without discharging residual iron during shutdown of blast furnace empty material line | |
| CN105274277B (en) | A kind of datonation-inhibition oxygen blast control method of converter dry dedusting | |
| CN103173593B (en) | Molten steel vacuum refining system based on mechanical pump group | |
| CN109295271A (en) | A kind of method that blast furnace stockline dropping blowing out extends the gas recovery time | |
| CN1789437A (en) | Slit type ladle bottom blowing powder injection process and apparatus | |
| CN220183323U (en) | Slag overflow preventing and pressing gun device in VD treatment process | |
| CN109210936A (en) | A kind of side-blown spray gun and application method of smelting furnace | |
| CN111763786A (en) | High-temperature steel slag carbonization deep stabilization treatment device and method | |
| CN108148948B (en) | High-efficiency single-nozzle refining furnace and special steel smelting process | |
| CN112877507A (en) | Anti-blocking device for blowing hole of RH furnace dipping pipe and method for removing steel slag in blowing hole | |
| CN102154535B (en) | Vacuum degree gas saving regulation system | |
| CN108823357B (en) | Degassing method of degassing system based on flexible mechanical vacuum pump set | |
| CN2861175Y (en) | Slit-type ladle bottom blowing power injection apparatus | |
| CN106868314A (en) | The technique and device of a kind of lead bullion refinement oxide | |
| CN107604123B (en) | Method for effectively improving recovery quality and quantity of converter gas | |
| CN208649133U (en) | Online float glass process coated glass transition roller table SO2 protects gas system | |
| CN112029996A (en) | Production method of high-quality sponge titanium with low oxygen impurity content | |
| CN106011390A (en) | Control system and method for VD vacuum refining furnace steel slag overflow | |
| CN112226627A (en) | Preparation device for aluminum alloy composite material | |
| CN215822731U (en) | Reduction furnace tail gas treatment system | |
| CN2927077Y (en) | Gas protector of optical-fiber curing furnace | |
| CN210625392U (en) | Furnace pressure automatic control device of glass fiber kiln | |
| CN206127377U (en) | Old and useless printed circuit board's of resourceful treatment kiln | |
| CN220812507U (en) | Miniature inclusion removing device for LF-RH furnace | |
| CN213772167U (en) | Preparation device for aluminum alloy composite material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |