CN112458238A - Novel AOD spiral side gun - Google Patents
Novel AOD spiral side gun Download PDFInfo
- Publication number
- CN112458238A CN112458238A CN202011117464.2A CN202011117464A CN112458238A CN 112458238 A CN112458238 A CN 112458238A CN 202011117464 A CN202011117464 A CN 202011117464A CN 112458238 A CN112458238 A CN 112458238A
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- Prior art keywords
- gun
- spiral
- main
- aod
- main gun
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 239000011449 brick Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 16
- 238000007670 refining Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
Images
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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a novel AOD spiral side gun, which comprises a main gun, an auxiliary gun and a spiral lining plate, wherein the main gun is used as a central pipe, the auxiliary gun is sleeved outside the main gun, and the main gun and the auxiliary gun are coaxially arranged; a spiral lining plate is arranged in the main gun to make the gas in the main gun rotate; the spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2mm, and the thread pitch of the spiral lining plate is 700 mm; the main gun is made of red copper, the thickness of the main gun is 3mm, and the diameter of the outer wall of the main gun is 21 mm; the sublance is made of stainless steel, the thickness is 4mm, and the diameter of the outer wall is 34 mm. The invention has simple structure, convenient modification and easy implementation, does not need to make special changes on refractory bricks, masonry modes and the like, and is beneficial to popularization and application.
Description
Technical Field
The invention relates to a novel AOD spiral side gun.
Background
The AOD (Argon-Oxygen Decarburization) method is a refining method for smelting stainless steel, in which Oxygen is blown into molten steel for Decarburization at normal pressure, and Argon (or nitrogen) is blown into the molten steel for reducing the partial pressure of carbon monoxide and realizing Decarburization and chromium retention. The AOD equipment mainly comprises a furnace body, a backing ring, a tilting mechanism, an oxygen lance, a side lance and other systems. The AOD furnace is characterized in that argon oxygen gas is horizontally blown into a molten pool from the side wall close to the furnace bottom through a plurality of (not less than 3) sleeve side guns, jet gas drives the molten pool in the AOD to flow, and refining reaction occurs between gas and liquid. A plurality of AOD furnaces put into production in China at present are used for producing stainless steel. The biggest deficiency of the AOD method is its short life of the lining, and production practices have shown that one of the significant features of AOD lining is suffering from uneven wear and erosion, which zone is always in contact with the high temperature bath, and the side lance zone refractory generally has a life of only 80 furnaces, which is certainly closely related to gas injection conditions and melt movement patterns in the bath. In order to improve the outlet state of the airflow and the flow state of the melt, accelerate the refining reaction between gas phase and liquid phase, shorten the refining time, reduce the erosion of the fluid to the furnace lining, and prolong the service life of the AOD refractory material, especially the service life of the refractory material above the muzzle of the side gun, a plurality of research institutions and researchers have made many researches on the structure and design of the AOD side gun, such as a flat side gun, a four-corner circular seam type side gun, a hexagonal circular seam type side gun and the like. At present, double-layer sleeve type AOD side guns are common and are shown in figure 1 in detail, particularly for a large-tonnage AOD furnace, the side guns are double-layer sleeve type constant-section side guns which are divided into a main gun (a central tube) and a sublance (a circular seam between an inner tube and an outer tube). Oxygen + nitrogen or oxygen + argon mixed gas is blown into the main gun, and protective gas (nitrogen or argon) with a cooling effect is blown into the auxiliary gun. The blowing of gas into the main gun is a key link of AOD refining reaction, which determines the AOD refining effect and refining time, and the secondary gun gas plays a secondary role in the refining reaction and plays a 'shielding effect' on the air flow blown by the main gun.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel AOD spiral side gun,
in order to solve the technical problem, the invention is realized as follows:
the utility model provides a novel AOD screw-type side rifle which characterized in that: the gun comprises a main gun, an auxiliary gun and a spiral lining plate, wherein the main gun is used as a central pipe, the auxiliary gun is sleeved outside the main gun, and the main gun and the auxiliary gun are coaxially arranged; the main gun is internally provided with a spiral lining plate, so that the gas in the main gun rotates.
Novel AOD spiral side rifle, its characterized in that: the spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2mm, and the thread pitch of the spiral lining plate is 700 mm.
Novel AOD spiral side rifle, its characterized in that: the main gun is red copper, the thickness of the main gun is 3mm, and the diameter of the outer wall of the main gun is 21 mm.
Novel AOD spiral side rifle, its characterized in that: the sublance is made of stainless steel, the thickness of the sublance is 4mm, and the diameter of the outer wall of the sublance is 34 mm.
The invention has the beneficial effects that: compared with a straight barrel type side gun, the spiral side gun causes the forced rotation movement of the main gun airflow, the side gun outlet can be obviously changed, and the mechanical scouring of fluid to a molten pool can be effectively reduced and inhibited under a certain side blowing condition. Meanwhile, at the outlet of the side lance, the gas jet flow is in an obvious rotating state, and the rising gas-liquid two-phase flow and surrounding molten steel still have certain rotating motion under the action of inertia force. The penetration distance of the spiral jet flow in the molten steel along the horizontal direction is slightly shorter than that of a straight cylinder type jet flow, but the speed and the vortex intensity of the circular motion of the molten steel are high, a molten pool is more active, the fluctuation is stronger, and the whole AOD refining period is shortened. Especially, under the same gas supply pressure, the outlet pressure and gas quantity of the spiral side gun are reduced by about 15-20%, but the rotating gas jet has stronger stirring effect on a molten pool and better refining effect.
The gas rotary motion increases the sectional area of gas-liquid two-phase flow, two flows are easier to meet or collide, and the service life of the refractory material above the side gun outlet is prolonged due to the fact that the pressure of the spiral outlet is smaller than that of a straight cylinder.
In conclusion, the fireproof brick has the advantages of simple structure, convenience in modification and easiness in implementation, and the fireproof bricks, the masonry modes and the like do not need to be changed particularly, so that the fireproof brick is beneficial to popularization and application.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
fig. 1 is a schematic view of a conventional side gun.
Fig. 2 is a schematic view of a straight barrel type side gun.
Fig. 3 is a schematic view of the side gun principle of the present application.
Fig. 4 is a schematic diagram of the internal structure of the side gun.
Fig. 5 is a schematic view of the internal structure of the main gun.
Detailed Description
As shown in fig. 1-5: a novel AOD spiral side gun comprises a main gun 1, an auxiliary gun 2 and a spiral lining plate 3, wherein the main gun is used as a central pipe, the auxiliary gun is sleeved outside the main gun, and the main gun and the auxiliary gun are coaxially arranged; the main gun is internally provided with a spiral lining plate, so that the gas in the main gun rotates.
The spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2mm, and the thread pitch of the spiral lining plate is 700 mm. If the pitch is too small, the gas flow in the main gun is influenced, so that the flow and the pressure at an outlet are obviously reduced, and the refining effect and time are influenced; if the pitch is too large, the air flow cannot be rotated by the air flow of the main gun, and the refining effect cannot be improved.
The main gun is red copper, the thickness of the main gun is 3mm, and the diameter of the outer wall of the main gun is 21 mm.
The sublance is made of stainless steel, the thickness of the sublance is 4mm, and the diameter of the outer wall of the sublance is 34 mm.
The design principle of the application is as follows: on the basis of the existing straight-tube sleeve type side gun structure, the rotation of the main gun airflow is realized by a structural scheme that a spiral lining plate is additionally arranged in an AOD side gun main gun (central tube), and the main gun airflow can rotate to a certain extent after being sprayed out from a side gun as shown in figure 2. Under the same air supply pressure, the air quantity at the outlet of the spiral side gun is reduced by about 15-20% compared with that of a straight cylinder type, and the flow reduction amplitude is increased along with the increase of the air pressure. Under the same air blowing quantity, the spiral side gun jet flow can provide stronger stirring, so that the flow of a molten pool is more active, the mixing effect is better, and the smelting time is shortened.
Claims (4)
1. The utility model provides a novel AOD screw-type side rifle which characterized in that: the gun comprises a main gun, an auxiliary gun and a spiral lining plate, wherein the main gun is used as a central pipe, the auxiliary gun is sleeved outside the main gun, and the main gun and the auxiliary gun are coaxially arranged; the main gun is internally provided with a spiral lining plate, so that the gas in the main gun rotates.
2. The novel AOD spiral-type side gun of claim 1, wherein: the spiral lining plate is made of red copper, the thickness of the spiral lining plate is 2mm, and the thread pitch of the spiral lining plate is 700 mm.
3. The novel AOD spiral-type side gun of claim 1, wherein: the main gun is red copper, the thickness of the main gun is 3mm, and the diameter of the outer wall of the main gun is 21 mm.
4. The novel AOD spiral-type side gun of claim 1, wherein: the sublance is made of stainless steel, the thickness of the sublance is 4mm, and the diameter of the outer wall of the sublance is 34 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117464.2A CN112458238A (en) | 2020-10-19 | 2020-10-19 | Novel AOD spiral side gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117464.2A CN112458238A (en) | 2020-10-19 | 2020-10-19 | Novel AOD spiral side gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112458238A true CN112458238A (en) | 2021-03-09 |
Family
ID=74833946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011117464.2A Pending CN112458238A (en) | 2020-10-19 | 2020-10-19 | Novel AOD spiral side gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112458238A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202047088U (en) * | 2011-04-21 | 2011-11-23 | 宝山钢铁股份有限公司 | Spiral plate type spray gun for argon oxygen decarbonization of stainless steel |
| CN202968620U (en) * | 2012-12-18 | 2013-06-05 | 营口东邦冶金设备耐材有限公司 | Double-hole rotary fire-resistant spray gun |
| CN204224640U (en) * | 2014-11-18 | 2015-03-25 | 沈阳铸造研究所 | A kind of AOD spray gun |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN205974579U (en) * | 2016-08-23 | 2017-02-22 | 江苏星火特钢有限公司 | Improved generation AOD oxygen lance |
| RU2665539C1 (en) * | 2018-01-31 | 2018-08-30 | Олег Савельевич Кочетов | Swirl nozzle |
| CN111041158A (en) * | 2019-12-23 | 2020-04-21 | 广东华鳌合金新材料有限公司 | AOD furnace gas device with pressure stabilizing tank and steelmaking method thereof |
-
2020
- 2020-10-19 CN CN202011117464.2A patent/CN112458238A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202047088U (en) * | 2011-04-21 | 2011-11-23 | 宝山钢铁股份有限公司 | Spiral plate type spray gun for argon oxygen decarbonization of stainless steel |
| CN202968620U (en) * | 2012-12-18 | 2013-06-05 | 营口东邦冶金设备耐材有限公司 | Double-hole rotary fire-resistant spray gun |
| CN204224640U (en) * | 2014-11-18 | 2015-03-25 | 沈阳铸造研究所 | A kind of AOD spray gun |
| CN105316452A (en) * | 2015-11-26 | 2016-02-10 | 中冶赛迪工程技术股份有限公司 | High-lance-position vacuum refining method based on coherent jet top lance |
| CN205974579U (en) * | 2016-08-23 | 2017-02-22 | 江苏星火特钢有限公司 | Improved generation AOD oxygen lance |
| RU2665539C1 (en) * | 2018-01-31 | 2018-08-30 | Олег Савельевич Кочетов | Swirl nozzle |
| CN111041158A (en) * | 2019-12-23 | 2020-04-21 | 广东华鳌合金新材料有限公司 | AOD furnace gas device with pressure stabilizing tank and steelmaking method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 段永彬等: "侧吹气流的旋转对侧顶复吹AOD转炉熔池内流体混合特性的影响", 《上海金属》 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210309 |