CN214422680U - RH refining furnace ascending pipe internal side blowing CO2-Ar refining device - Google Patents
RH refining furnace ascending pipe internal side blowing CO2-Ar refining device Download PDFInfo
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- CN214422680U CN214422680U CN202022763943.3U CN202022763943U CN214422680U CN 214422680 U CN214422680 U CN 214422680U CN 202022763943 U CN202022763943 U CN 202022763943U CN 214422680 U CN214422680 U CN 214422680U
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Abstract
The utility model relates to a CO side-blown in ascending pipe of RH refining furnace2an-Ar refining device belongs to the technical field of ferrous metallurgy and solves the problems of high molten steel dissolved oxygen, burning loss of refractory materials in a vacuum chamber and long refining time in the refining process of the existing RH refining furnace. The refining device comprises: RH refining furnace, Ar gas source and CO2Gas source, flue gas analysis unit, temperature measurement sampling unit and gas controlA system; the flue gas analysis unit is connected with an exhaust pipeline above a vacuum chamber of the RH refining furnace; the flue gas analysis unit and the temperature measurement sampling unit are respectively connected with the gas control system; ar gas provided by the Ar gas source and the CO2CO supplied from a gas source2The riser of the RH refining furnace is fed through the gas inlet of the riser. Use the utility model discloses a refining device can reduce dissolved oxygen in the steel by a wide margin, improves the molten steel quality, shortens the refining time.
Description
Technical Field
The utility model relates to the technical field of ferrous metallurgy, especially, relate to a RH refining furnace riser intraductal side blow CO2-an Ar refining unit.
Background
In the modern steel production flow, external refining becomes an indispensable important link. The RH method, namely the molten steel vacuum circulation degassing method, has the advantages of simple and convenient treatment process operation, large treatment capacity and high production efficiency, has various metallurgical functions of decarburization, dehydrogenation, deoxidation, oxygen blowing and temperature rise, powder injection and desulfurization, component control, molten steel purity improvement and the like, is a multifunctional vacuum refining method, and is praised as the most excellent molten steel vacuum refining method. The RH method is more and more widely adopted by steel plants due to the characteristic of rapid treatment and lower treatment cost, and the RH refining furnace is one of key devices adopted in the refining process of the RH method. In the RH method refining process, two dip pipes at the lower part of a vacuum chamber are inserted into molten steel, the vacuum chamber is vacuumized by a vacuum pump, argon is blown from the lower part of an ascending pipe to enable the molten steel to circularly flow, the vacuum degassing process is accelerated, and the components and the temperature are uniform.
The existing RH refining furnace refining generally adopts ascending pipe side-blown Ar as driving gas to improve the dynamic condition of a molten pool, but the process can cause a series of problems: 1) the top blowing oxygen decarburization easily causes dissolved oxygen in steel, and a deoxidizer such as aluminum and the like needs to be added into a vacuum chamber, so that inclusions in molten steel are increased to influence the cleanliness of the molten steel; 2) the top lance is adopted to blow oxygen to the molten steel for a long time, so that the refractory material of the vacuum chamber is easily burnt and falls off; 3) when the carbon content at the tapping end point of the converter is higher or the ultra-low carbon steel is smelted, the oxygen blowing time is increased, so that the oxygen lance and the steel are subjected to oxygen blowingThe liquid contact time is too long, so that the service life of the oxygen lance is shortened; 4) the traditional RH refining furnace limits the production of clean steel and ultra-low carbon steel, when the circulating flow rate of molten steel is constant, top-blown oxygen is adopted for decarburization, and a large amount of CO and O are generated due to the decarburization reaction of a molten pool2The reaction causes the reduction of the utilization rate of oxygen, limits the decarburization rate, and causes long refining time and high smelting cost; 5) oxygen blowing decarburization is adopted to cause the increase of dissolved oxygen in steel, the cleanliness of molten steel is reduced to influence the casting blank quality, and Al generated by deoxidation2O3The submerged nozzle is easy to be blocked. In conclusion, how to improve the decarburization rate of the RH process and reduce the dissolved oxygen in the decarburized steel is the key to reduce the production cost of the RH process, accelerate the refining rhythm of the RH refining furnace and smelt high-cleanness steel and ultra-low-carbon steel.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention is directed to provide a method for blowing CO into the riser of an RH refining furnace2-an Ar refining plant capable of solving at least one of the following technical problems: (1) the molten steel has high dissolved oxygen in the refining process of the existing RH refining furnace, (2) the refractory material in the vacuum chamber is burnt and lost, and (3) the refining time is long, and (4) the service life of the oxygen lance is short.
The purpose of the utility model is mainly realized through the following technical scheme:
the utility model discloses a CO side-blown in ascending pipe of RH refining furnace2-an Ar refining apparatus comprising: RH refining furnace, Ar gas source and CO2The device comprises a gas source, a flue gas analysis unit, a temperature measurement sampling unit and a gas control system;
the flue gas analysis unit is connected with an exhaust pipeline above a vacuum chamber of the RH refining furnace;
the flue gas analysis unit and the temperature measurement sampling unit are respectively connected with the gas control system;
ar gas provided by the Ar gas source and the CO2CO supplied from a gas source2The riser of the RH refining furnace is fed through the gas inlet of the riser.
Further, the device also comprises a gas mixing tank, wherein the Ar gas source is connected with the gas mixing tank through an Ar pipeline, and the CO is2Gas source passing through CO2The pipeline is connected with the gas mixing tankAnd the gas mixing tank is connected with the gas inlet of the ascending pipe through a gas conveying pipe.
Furthermore, the gas control system comprises a molten steel component data acquisition unit, a riser side blowing gas flow data acquisition unit, a flue gas component data acquisition unit and a molten steel component prediction unit; the gas control system dynamically adjusts Ar gas and CO in the ascending pipe according to target molten steel components, molten steel component sampling analysis results and smoke component data2Gas flow and ratio of (c).
Furthermore, the flue gas analysis unit is provided with a signal transmission device, and the signal transmission device is connected with the gas control system.
Further, the relationship between the height H of the air inlet of the ascending pipe from the bottom of the ascending pipe and the height H of the ascending pipe is as follows: h is 1/3H.
Furthermore, a first flow valve and a first pressure valve are arranged on the Ar pipeline.
Further, said CO2The pipeline is provided with a second flow valve and a second pressure valve.
Furthermore, a top-blowing oxygen lance is arranged in the furnace body of the RH refining furnace and is used for blowing oxygen into the furnace body.
Furthermore, one side of the furnace body of the RH refining furnace is provided with a vacuum pump, and the vacuum pump is used for vacuumizing the vacuum chamber.
Further, blowing CO from the inner side of the ascending pipe of the RH refining furnace2The Ar refining device also comprises a ladle which is arranged below the furnace body of the RH refining furnace.
The utility model discloses can realize one of following beneficial effect at least:
(1) the utility model provides a CO is blown to the side in RH refining furnace riser2the-Ar refining device is provided with an Ar gas source and CO2A gas source and a gas mixing tank, wherein CO is adopted in the RH refining process2The mixed gas of Ar gas and the gas is used as the blowing driving gas of the ascending pipe, and the data such as the initial molten steel component data, the molten steel sampling analysis result, the smoke component in the refining process and the like are combined to blow CO on the side in the ascending pipe2-Ar gas flow rateDynamic regulation is carried out, the molten steel circularly flows between the vacuum chamber and the steel ladle to accelerate the degassing process of the molten steel, and simultaneously CO is added2The carbon reacts with carbon in the molten steel to generate CO, so that the decarburization task of oxygen blowing by a top lance is reduced, the dissolved oxygen in the steel is greatly reduced, and the quality of the molten steel is improved; decarbonization to produce CO and O2The reaction generates heat to compensate the heat loss in the RH refining process, thereby reducing the tapping temperature of the converter.
(2) Adopt the utility model provides an internal side blowing CO of RH refining furnace riser2The rear part of the Ar refining device can realize the quick decarburization in the RH refining process, shorten the refining time, relax the carbon content of the steel discharged from the converter, lighten the smelting burden of the converter, reduce the dissolved oxygen in the steel after the RH decarburization, reduce the consumption of a deoxidizer, improve the cleanliness of the molten steel, improve the quality of the molten steel, simultaneously reduce the consumption of Ar gas, reduce the loss of a refractory material and a top-blown oxygen lance of a vacuum chamber and reduce the production cost. The carbon content in the steel treated by the RH method can reach 10.0 multiplied by 10-4% or less, dissolved oxygen content of less than 1.0X 10-4Percent, the service life of the oxygen lance is prolonged from about 200 times to not less than 270 times, the product quality is improved, and the refining time is shortened.
(3) By passing through Ar pipeline and CO2The pipeline is respectively provided with a flow valve and a pressure valve, and Ar gas and CO can be realized2The operation is simple and accurate.
The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
FIG. 1 shows the internal side blowing of CO into the riser of the RH refining furnace2-schematic structural view of Ar refining apparatus.
Reference numerals:
1-gas control system, 2-flue gas analysis unit, 3-temperature measurement sampling unit, 4-gas mixing tank, 5-Ar gas source and 6-CO2The method comprises the following steps of gas source, 7-steel ladle, 8-top blowing oxygen lance, 9-furnace body, 10-ascending pipe and 11-descending pipe.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
Spatially relative terms such as "below," "beneath," "above," "over," and the like may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, when the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below.
The following description of the embodiments of the present invention is made with reference to the accompanying drawings:
as shown in figure 1, the internal side blowing CO of the ascending pipe of the RH refining furnace2-an Ar refining apparatus comprising: RH refining furnace, Ar gas source 5 and CO2The gas source 6, the gas mixing tank 4 and the gas control system 1; an ascending pipe 10 and a descending pipe 11 are arranged in a furnace body 9 of the RH refining furnace, and an air inlet is arranged on the ascending pipe 10; an Ar gas source 5 is connected with the gas mixing tank 4 through an Ar pipeline, and CO2Gas source 6 is through CO2The pipeline is connected with a gas mixing tank 4, the gas mixing tank 4 is connected with a gas inlet through a gas conveying pipe, and Ar gas and CO provided by an Ar gas source 52CO from gas source 62Mixed by the gas mixing tank 4 and then can be fed into the ascending pipe 10 through the gas inlet; ar gas source 5 and CO2The gas sources 6 are respectively connected with the gas control system 1. The gas control system 1 can dynamically adjust the Ar gas source 5 and the CO2Gas source6 gas supply process parameters.
Specifically, the height of the gas inlet from the bottom of the riser 10 and the relationship between H and the height H of the riser 10 are as follows: h is 1/3H.
Specifically, the gas control system 1 comprises a molten steel component data acquisition unit, a riser side blowing gas flow data acquisition unit, a flue gas component data acquisition unit and a molten steel component prediction unit; the gas control system 1 dynamically adjusts Ar gas and CO in the ascending pipe according to target molten steel components, molten steel component sampling analysis results and smoke component data2Gas flow rate and gas ratio.
Specifically, CO is blown to the inner side of a riser of the RH refining furnace2The Ar refining device also comprises a flue gas analysis unit 2, the flue gas analysis unit 2 is connected with an exhaust pipeline above a vacuum chamber of the RH refining furnace, and the flue gas analysis unit 2 can perform online analysis on flue gas components in the exhaust pipeline and acquire instantaneous flue gas component data in the refining process; the flue gas analysis unit 2 is provided with a signal transmission device, the signal transmission device is connected with the gas control system 1, and the data of the flue gas analysis unit 2 can be transmitted to a flue gas component data acquisition unit of the gas control system 1.
Specifically, CO is blown to the inner side of a riser of the RH refining furnace2The Ar refining device also comprises a temperature measurement sampling unit 3, wherein the temperature measurement sampling unit 3 is used for collecting molten steel in a steel ladle and analyzing the components of the molten steel; the temperature measurement sampling unit 3 is connected with the gas control system 1, and the temperature measurement sampling unit 3 can transmit the component detection data of the molten steel to the molten steel component data acquisition unit of the gas control system 1.
Specifically, a first flow valve and a first pressure valve are arranged on the Ar pipeline, and the flow of Ar gas is controlled by adjusting the first flow valve and the first pressure valve; the flow of Ar gas is dynamically controlled after being analyzed on line by the gas control system 1.
In particular, CO2The pipeline is provided with a second flow valve and a second pressure valve, and CO is adjusted by adjusting the second flow valve and the second pressure valve2Controlling the flow rate of the air conditioner; CO22The flow rate of the gas control system 1 is analyzed on line to realize dynamic control.
By passing through Ar pipeline and CO2The pipeline is respectively provided with a flow valve and a pressure valve, and Ar gas and CO can be realized2The operation is simple and accurate.
Specifically, a top-blowing oxygen lance 8 is arranged in a furnace body 9 of the RH refining furnace, and the top-blowing oxygen lance 8 is used for blowing oxygen into the furnace body 9.
Specifically, one side of the furnace body 9 of the RH refining furnace is provided with a vacuum pump, and the vacuum pump is used for vacuumizing the vacuum chamber.
Specifically, CO is blown to the inner side of a riser of the RH refining furnace2the-Ar refining apparatus further includes a ladle 7, and the ladle 7 is disposed below the furnace body 9.
Note that CO is blown inside the riser of the RH refining furnace2The working principle of the-Ar refining device is as follows: after the steel ladle 7 reaches the lower part of the RH refining furnace, firstly, a vacuumizing stage is carried out, a vacuum chamber above the steel ladle 7 descends, an ascending pipe 10 and a descending pipe 11 are inserted into molten steel (the pipe orifice sleeves of the ascending pipe and the descending pipe are provided with a slag blocking cap to prevent slag from entering the vacuum chamber in the descending process, the slag blocking cap is automatically melted after entering the molten steel), after the ascending pipe 10 and the descending pipe 11 are inserted into the molten steel for a certain depth, a vacuum pump is started to vacuumize the vacuum chamber (the vacuum degree is 0.3kPa-0.06kPa), due to the pressure difference between the inside and the outside of the vacuum chamber, the liquid level of the molten steel rises to the pressure difference equal height from the ascending pipe 10 and the descending pipe 11, and at the moment, CO is blown in from an air inlet of the ascending pipe 102And Ar gas, wherein after the mixed gas enters the ascending pipe 10, because the heated volume rapidly expands and the pressure is reduced, a large number of bubble nuclei are instantly generated in the ascending pipe 10, and because the partial pressure of hydrogen and nitrogen in the molten steel is zero, the dissolved gas in the steel rapidly diffuses to bubbles, and simultaneously, the dissolved carbon in the steel and CO in the bubbles2The gas reacts to generate CO, and the gas drives the molten steel to spray into the vacuum chamber in a fountain shape due to the expansion of bubbles caused by heating, so as to drive the molten steel to circulate. Wherein, in the refining process, whether a top-blown oxygen lance is adopted for oxygen supply and proper flow is selected according to specific conditions and decarburization tasks.
In particular, CO2The specific adjustment scheme of the proportion of the mixed gas of Ar and Ar is as follows:
when the target carbon content is less than 0.05%,
1) when real time carbon content [% C]More than or equal to 0.04 percent and mixed gas CO2The volume ratio is 80-99%, and oxygen supply system is matched according to specific conditions.
2) When the real-time carbon content is less than or equal to 0.03 [% C]Less than 0.04%, mixed gas CO2The volume ratio is 60-80%, and oxygen supply is stopped according to specific conditions.
3) When real time carbon content [% C]Less than 0.03%, mixed gas CO2The volume ratio is 40-60%, and oxygen supply is stopped according to specific conditions.
Compared with the prior art, the utility model provides an internal side blowing CO of RH refining furnace riser2After the-Ar refining device, in the RH refining process, CO is adopted2The mixed gas of Ar gas and the gas is used as the blowing driving gas of the ascending pipe, and the data such as the initial molten steel component data, the molten steel sampling analysis result, the smoke component in the refining process and the like are combined to blow CO on the side in the ascending pipe2The flow of Ar gas is dynamically adjusted, the molten steel circularly flows between the vacuum chamber and the steel ladle to accelerate the degassing process of the molten steel, and CO is added2The carbon reacts with carbon in the molten steel to generate CO, so that the decarburization task of oxygen blowing by a top lance is reduced, the dissolved oxygen in the steel is greatly reduced, and the quality of the molten steel is improved; decarbonization to produce CO and O2The reaction generates heat to compensate the heat loss in the RH refining process, thereby reducing the tapping temperature of the converter.
Adopt the utility model provides an internal side blowing CO of RH refining furnace riser2The rear part of the Ar refining device can realize the quick decarburization in the RH refining process, shorten the refining time, relax the carbon content of the steel discharged from the converter, lighten the smelting burden of the converter, reduce the dissolved oxygen in the steel after the RH decarburization, reduce the consumption of a deoxidizer, improve the cleanliness of the molten steel, improve the quality of the molten steel, simultaneously reduce the consumption of Ar gas, reduce the loss of a refractory material and a top-blown oxygen lance of a vacuum chamber and reduce the production cost. The carbon content in the steel treated by the RH method can reach 10.0 multiplied by 10-4% or less, dissolved oxygen content of less than 1.0X 10-4Percent, the service life of the oxygen lance is prolonged from about 200 times to not less than 270 times, the product quality is improved, and the refining time is shortened.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (9)
1. CO is blown to RH refining furnace riser pipe inboard2-an Ar refining apparatus, characterized by comprising: RH refining furnace, Ar gas source (5) and CO2The device comprises a gas source (6), a flue gas analysis unit (2), a temperature measurement sampling unit (3) and a gas control system (1);
the flue gas analysis unit (2) is connected with an exhaust pipeline above a vacuum chamber of the RH refining furnace;
the flue gas analysis unit (2) and the temperature measurement sampling unit (3) are respectively connected with the gas control system (1); the flue gas analysis unit (2) is provided with a signal transmission device, and the signal transmission device is connected with the gas control system (1);
ar gas provided by the Ar gas source (5) and the CO2CO supplied from a gas source (6)2A riser (10) of the RH refining furnace is fed through a gas inlet of the riser.
2. The RH refining furnace riser inner side blown CO of claim 12-Ar refining device, characterized in that it further comprises a gas mixing tank (4), the Ar gas source (5) is connected with the gas mixing tank (4) through an Ar pipeline, and the CO is2The gas source (6) is through CO2The pipeline is connected with the gas mixing tank (4), and the gas mixing tank (4) is connected with the gas inlet of the ascending pipe (10) through a gas conveying pipe.
3. The RH refining furnace riser inner side blown CO of claim 12-Ar refining apparatus, characterized in that the gas control system (1) comprises a molten steel composition data acquisition unit, a riser side blowing gas flow data acquisition unit, a flue gas composition data acquisition unit and a molten steel composition prediction unit; the gas control system (1) dynamically adjusts Ar gas and CO in the ascending pipe according to target molten steel components, molten steel component sampling analysis results and flue gas component data2Gas flow and ratio of (c).
4. The RH refining furnace riser inner side blown CO of claim 12-Ar refining plant, characterized in that the height H of the gas inlet of the riser (10) from the bottom of the riser (10) is related to the height H of the riser (10) by: h is 1/3H.
5. The RH refining furnace riser inner side blown CO of claim 22-Ar refining plant, characterized in that a first flow valve and a first pressure valve are provided on the Ar piping.
6. The RH refining furnace riser inner side blown CO of claim 22-Ar refining plant, characterized in that the CO is2The pipeline is provided with a second flow valve and a second pressure valve.
7. The RH refining furnace riser inner side blown CO of claim 12-Ar refining plant, characterized in that top-blowing lances (8) are provided in the vessel (9) of the RH refining furnace, which top-blowing lances (8) are used to blow oxygen into the vessel (9).
8. The RH refining furnace riser inner side blown CO of claim 12-Ar refining plant, characterized in that one side of the furnace body (9) of the RH refining furnace is provided with a vacuum pump for evacuating the vacuum chamber.
9. The RH refining furnace riser pipe inside-side blowing CO of any one of claims 1-82An Ar refining apparatus, characterized in that CO is blown inside the riser of the RH refining furnace2-the Ar refining plant further comprises a ladle (7), said ladle (7) being placed below the body (9) of the RH refining furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022763943.3U CN214422680U (en) | 2020-11-25 | 2020-11-25 | RH refining furnace ascending pipe internal side blowing CO2-Ar refining device |
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| CN202022763943.3U CN214422680U (en) | 2020-11-25 | 2020-11-25 | RH refining furnace ascending pipe internal side blowing CO2-Ar refining device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
| CN117230281B (en) * | 2023-11-14 | 2024-01-23 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
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