CN219526696U - CO is blown to VOD stove 2 Is a refining system of (2) - Google Patents
CO is blown to VOD stove 2 Is a refining system of (2) Download PDFInfo
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- CN219526696U CN219526696U CN202320697691.XU CN202320697691U CN219526696U CN 219526696 U CN219526696 U CN 219526696U CN 202320697691 U CN202320697691 U CN 202320697691U CN 219526696 U CN219526696 U CN 219526696U
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- 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
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Abstract
The utility model provides a method for blowing CO into a VOD furnace 2 Belongs to the technical field of metallurgical vacuum refining. The system comprises a control system, O 2 Gas source, CO 2 Air source, ar air source, top-blowing control valve group, bottom-blowing control valve group, alloy adding calculation system, vacuumizing system, alloy hopper, alloy adding hole, vacuum degree detector, top-blowing oxygen gun, bottom-blowing air brick and exhaust hole, wherein the control system is connected with the vacuum degree detector and alloy adding deviceComputing system, vacuumizing system, top-blowing control valve group and bottom-blowing control valve group, CO 2 The air source is respectively connected into the top blowing control valve group and the bottom blowing control valve group, and O is adopted 2 +CO 2 Ar+CO as top-blown gas 2 As lifting gas. The utility model can control the temperature and the partial pressure of CO in different smelting periods of the VOD furnace, promote the continuous proceeding of the decarburization chromium-preserving reaction, thereby being beneficial to the acceleration of the production rhythm of stainless steel smelting in the VOD furnace, improving the metal yield of chromium and reducing the smelting cost.
Description
Technical Field
The utility model relates to the technical field of metallurgical vacuum refining, in particular to a method for blowing CO into a VOD furnace 2 Is a refining system of (a).
Background
The prior smelting method of the stainless steel mainly adopts a two-step method, firstly, low-carbon steel meeting the requirements is smelted through a converter or an electric furnace, and then, the completion of decarburization and chromium retention of the steel grade is realized through refining, so that the stainless steel meeting the requirements is smelted. The difference of the smelting stainless steel process is mainly the difference of the refining process, which is divided into an AOD refining method and a VOD refining method, but the VOD refining method is needed to be selected when the ultra-pure stainless steel is smelted.
The main equipment of the VOD refining method consists of a vacuum system, a vacuum tank cover vehicle and a feeding system. The refining process is that primary steelmaking water of a converter and an electric furnace is placed in a vacuum chamber, ar is blown from the bottom of a ladle to stir, O is blown from the top 2 And (5) oxidizing. The vacuum oxygen blowing decarburization, desulfurization, degassing, alloying and even treatment of molten steel temperature, components and the like can be realized through VOD refining.
The traditional VOD refining method is that pure O is blown from the top 2 The bottom blowing gas of bottom ventilation transfer is Ar, and the refining mode has the following 3 problems: (1) [ C ] to reduce the final molten Steel]The stirring strength of the molten pool and the flow rate of top-blown oxygen must be enhanced, which causes Ar and O 2 The amount of (c) used increases, thereby increasing the cost; (2) In the thermodynamic angle, the temperature is increased, which is favorable for the decarburization and chromium retention reaction, but the service life of the oxygen lance can be greatly adversely affected by the excessive temperature; (3) According to thermodynamic analysis, the lower the partial pressure of CO in the bath bubble, the more beneficial is [ C]But only by O 2 As an oxidizing agent, the partial pressure of CO in the bubbles is high and is not [ C ] in the molten steel]Optimal conditions for removal.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a method for blowing CO into a VOD furnace 2 Top-bottom combined blowing CO in VOD refining process 2 And adjusting the proportion of the injected gas according to the set injection parameters, and injecting different gas media according to smelting requirements in different smelting periods. The system can realize the purposes of accurately controlling the temperature of molten steel and promoting the stirring of a molten pool, thereby promoting the proceeding of decarburization chromium-preserving reaction, accelerating the production rhythm of VOD refining and reducing the production cost.
The system comprises a control system, O 2 Gas source, CO 2 An air source, an Ar air source, a top-blowing control valve group, a bottom-blowing control valve group, an alloy adding computing system, a vacuumizing system, an alloy hopper, an alloy adding hole, a vacuum degree detector, a top-blowing oxygen lance, a bottom-blowing air brick and an exhaust hole,
the control system is connected with the vacuum degree detector, the alloy adding computing system, the vacuumizing system, the top blowing control valve group and the bottom blowing control valve group,
CO 2 the air source is respectively connected with the top blowing control valve group and the bottom blowing control valve group,
O 2 the air source is connected with the top-blowing control valve group, the Ar air source is connected with the bottom-blowing control valve group,
the top-blowing control valve group is connected with a top-blowing oxygen lance, and the top-blowing oxygen lance is inserted from the top of the refining furnace;
the bottom blowing control valve group is connected with a bottom blowing air brick;
the alloy adding computing system controls the feeding amount of an alloy hopper, and the alloy hopper is inserted into the alloy adding hole;
the vacuumizing system is inserted into the upper part of the refining furnace;
the vacuum degree detector is inserted into the top of the refining furnace;
the side part of the refining furnace is provided with an exhaust hole.
Wherein O is 2 Pipeline and CO 2 The pipeline is independently controlled by a flow valve and a pressure valve respectively, and the two pipelines are connected in parallel and then summarized.
CO 2 The pipeline and the Ar pipeline are respectively and independently controlled through a flow valve and a pressure valve, and the two pipelines are connected in parallel and then summarized.
The system is suitable for 60-150 t VOD ladle refining process.
The system adopts O in the VOD refining process 2 +CO 2 Ar+CO as top-blown gas 2 As lifting gas. The bottom blowing air brick and the top oxygen lance can adjust the proportion of the blowing gas according to the set blowing parameters, and different gas media can be blown according to smelting requirements in different smelting periods; the temperature and the partial pressure of CO of the VOD furnace can be controlled in different smelting periods of the VOD furnace, and the continuous proceeding of the decarburization chromium-preserving reaction is promoted, so that the speed of the production rhythm of stainless steel smelting in the VOD furnace is facilitated, the metal yield of chromium is improved, and the smelting cost is reduced.
The technical scheme of the utility model has the following beneficial effects:
in the scheme, compared with the prior VOD injection system, the VOD furnace top bottom combined injection CO related by the utility model 2 Technology realizes C in VOD refining processO 2 The automatic conversion of the gas medium sprayed in different smelting stages in the VOD refining process is realized. Therefore, the temperature in the VOD refining process is controlled, the stirring intensity of a molten pool is enhanced, the decarburization chromium-preserving reaction is promoted, the production rhythm of the VOD refining can be accelerated, the service life of an oxygen lance is prolonged, and the production cost is reduced.
Drawings
FIG. 1 shows CO injection into a VOD furnace according to the present utility model 2 Is a schematic diagram of the refining system structure.
Wherein: 1-a control system; 2-O 2 A gas source; 3-CO 2 A gas source; 4-Ar gas source; 5-top blowing control valve group; 6-bottom blowing control valve group; 7-adding alloy into a computing system; 8-vacuumizing system; 9-an alloy hopper; 10-alloy addition holes; 11-vacuum degree detector; 12-top-blown oxygen lance; 13-bottom blowing air bricks; 14-exhaust hole.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The utility model provides a method for blowing CO into a VOD furnace 2 Is a refining system of (a).
As shown in FIG. 1, the system includes a control system 1, O 2 Gas source 2, CO 2 The air source 3, ar air source 4, top-blowing control valve group 5, bottom-blowing control valve group 6, alloy adding calculation system 7, vacuumizing system 8, alloy hopper 9, alloy adding hole 10, vacuum degree detector 11, top-blowing oxygen lance 12, bottom-blowing air brick 13 and exhaust hole 14,
the control system 1 is connected with a vacuum degree detector 11, an alloy adding computing system 7, a vacuumizing system 8, a top-blowing control valve group 5 and a bottom-blowing control valve group 6,
CO 2 the air source 3 is respectively connected with a top blowing control valve group 5 and a bottom blowing control valve group 6,
O 2 the air source 2 is connected with the top blowing control valve group 5, the Ar air source 4 is connected with the bottom blowing control valve group 6,
the top-blowing control valve group 5 is connected with a top-blowing oxygen lance 12, and the top-blowing oxygen lance 12 is inserted from the top of the refining furnace;
the bottom blowing control valve group 6 is connected with a bottom blowing air brick 13;
the alloy adding calculation system 7 controls the feeding amount of the alloy hopper 9, and the alloy hopper 9 is inserted into the alloy adding hole 10;
the vacuumizing system 8 is inserted into the upper part of the refining furnace;
the vacuum degree detector 11 is inserted into the top of the refining furnace;
the refining furnace side is provided with an exhaust hole 14.
The O is 2 Pipeline and CO 2 The pipeline is independently controlled by a flow valve and a pressure valve respectively, and the two pipelines are connected in parallel and then summarized.
The CO 2 The pipeline and the Ar pipeline are respectively and independently controlled through a flow valve and a pressure valve, and the two pipelines are connected in parallel and then summarized.
VOD furnace CO injection 2 The realization of the technology is divided into five stages: a VOD steel adding stage, a vacuum oxygen blowing decarburization stage, a high vacuum carbon deoxidization stage, a reduction stage and an alloy fine adjustment stage.
The CO is blown into the VOD furnace 2 The implementation process of the refining device system of the system is accompanied with the change of the vacuum degree in the VOD furnace and the alloy adding process in the VOD vacuum chamber at the end of smelting.
The application process of the system is as follows:
s1, in a steel mixing stage, molten steel smelted by an electric furnace or a converter is mixed with VOD for blowing when the mass percentage ratio reaches the refining requirement, a control system 1 in the steel mixing stage receives vacuum degree information transmitted by a vacuum degree detector 11, and a remote signal control vacuumizing system 8 adjusts the vacuum degree in a VOD vacuum chamber to 300-400 Pa.
S2, in the vacuum oxygen blowing and decarburization stage, the control system 1 is respectively connected with the top blowing control valve group 5 and the bottom blowing control valve group 6 through signal transmission wires, and the actions of the top blowing control valve group 5 and the bottom blowing control valve group 6 are controlled. Realizing top-blown gas O in VOD refining process 2 And CO 2 With CO in the bottom blowing gas 2 And Ar, and carrying out time-sharing dynamic switching and mixed blowing. Top-blown O at this stage 2 The flow rate of the catalyst is 800-1500 Nm 3 ·h -1 Bottom blowing CO 2 The flow rate of the water is 40-100 NL.min -1 The linearity is improved to 80 to 220NL·min -1 Top-blown CO 2 Is mixed with the mixture in the proportion of O 2 10% of the total weight of the product, and the blowing duration is 35-50 min. In this stage, the control system 1 receives the vacuum information transmitted from the vacuum degree detector 11, and controls the vacuumizing system 8 to adjust the vacuum degree in the VOD vacuum chamber to 67Pa or less through a remote signal.
S3, a high-vacuum carbon deoxidation stage, wherein the flow rate of top-blown gas is 0, and the flow rate of bottom-blown Ar is 100-320 NL.min -1 Mixing CO 2 The flow rate of the water is 80-220 NL.min -1 The linearity is reduced to 0, the smelting time at this stage is about 15-22 min, and the vacuum degree in the VOD vacuum chamber is kept at about 20 Pa.
S4, a reduction stage, wherein the flow rate of top-blown gas is kept to be 0, and the flow rate of bottom-blown Ar is increased to 120-380 NL.min -1 Deoxidizing by adding FeSi and Al particles as deoxidizing agents, adding lime and fluorite as slagging agents, and slagging, wherein the smelting time at the stage is 18-25 min, and the vacuum degree in the VOD vacuum chamber is increased to 67Pa.
S5, in the alloy fine adjustment stage, vacuum is released, the control system 1 gives an alloy addition instruction to the alloy addition computing system 7, the alloy addition computing system 7 computes the alloy addition amount in the VOD refining process mainly according to the molten steel component information and the alloying requirement of the refined stainless steel, then alloy row component adjustment is added into the VOD furnace through the alloy hopper 9 and the alloy addition hole 10, and the flow of bottom blowing Ar is 120-140 NL.min -1 And (5) carrying out weak stirring of molten steel for 15-18min.
Further, in one embodiment of the present utility model, CO is blown into the VOD furnace 2 In the refining apparatus system of (2), VOD top-blown gas and bottom-blown gas are changed from original O 2 And Ar is changed into top-bottom combined blowing CO 2 Further, the key is CO 2 Automated control of the incorporation ratios at the different refining stages.
Further, in one embodiment of the present utility model, CO is blown into the VOD furnace 2 In the refining apparatus system of (2), top-blown CO is to be realized 2 And O 2 The top-blown lance in the upper part of the VOD is required to meet the requirements of the required oxygen pressure and oxygen flow.
When the capacity of the VOD furnace changes, the VOD top-blown gas and bottom-blown gas CO can be realized by only adjusting and inputting smelting time, the type and the flow of the blown gas medium in different stages on an automatic control system 2 Automated control of the incorporation ratios at the different refining stages.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (4)
1. CO is blown to VOD stove 2 Is characterized by comprising a control system and O 2 Gas source, CO 2 An air source, an Ar air source, a top-blowing control valve group, a bottom-blowing control valve group, an alloy adding computing system, a vacuumizing system, an alloy hopper, an alloy adding hole, a vacuum degree detector, a top-blowing oxygen lance, a bottom-blowing air brick and an exhaust hole,
the control system is connected with the vacuum degree detector, the alloy adding computing system, the vacuumizing system, the top blowing control valve group and the bottom blowing control valve group,
CO 2 the air source is respectively connected with the top blowing control valve group and the bottom blowing control valve group,
O 2 the air source is connected with the top-blowing control valve group, the Ar air source is connected with the bottom-blowing control valve group,
the top-blowing control valve group is connected with a top-blowing oxygen lance, and the top-blowing oxygen lance is inserted from the top of the refining furnace;
the bottom blowing control valve group is connected with a bottom blowing air brick;
the alloy adding computing system controls the feeding amount of an alloy hopper, and the alloy hopper is inserted into the alloy adding hole;
the vacuumizing system is inserted into the upper part of the refining furnace;
the vacuum degree detector is inserted into the top of the refining furnace;
the side part of the refining furnace is provided with an exhaust hole.
2. The injection of CO into a VOD oven according to claim 1 2 Is characterized in that the O 2 Pipeline and CO 2 The pipeline is independently controlled by a flow valve and a pressure valve respectively, and the two pipelines are connected in parallel and then summarized.
3. The injection of CO into a VOD oven according to claim 1 2 Is characterized in that the CO 2 The pipeline and the Ar pipeline are respectively and independently controlled through a flow valve and a pressure valve, and the two pipelines are connected in parallel and then summarized.
4. The injection of CO into a VOD oven according to claim 1 2 Is characterized in that the system is suitable for 60-150 t VOD ladle refining process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320697691.XU CN219526696U (en) | 2023-04-03 | 2023-04-03 | CO is blown to VOD stove 2 Is a refining system of (2) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320697691.XU CN219526696U (en) | 2023-04-03 | 2023-04-03 | CO is blown to VOD stove 2 Is a refining system of (2) |
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| Publication Number | Publication Date |
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| CN219526696U true CN219526696U (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320697691.XU Active CN219526696U (en) | 2023-04-03 | 2023-04-03 | CO is blown to VOD stove 2 Is a refining system of (2) |
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| CN (1) | CN219526696U (en) |
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2023
- 2023-04-03 CN CN202320697691.XU patent/CN219526696U/en active Active
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