CN214781960U - Clean steel smelting system - Google Patents
Clean steel smelting system Download PDFInfo
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- CN214781960U CN214781960U CN202120997774.1U CN202120997774U CN214781960U CN 214781960 U CN214781960 U CN 214781960U CN 202120997774 U CN202120997774 U CN 202120997774U CN 214781960 U CN214781960 U CN 214781960U
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Abstract
The utility model relates to a clean steel smelting system belongs to metallurgical technical field, include along the initial smelting stove, slag-steel separator, refining furnace and the continuous casting package that the molten steel flow direction set up in order, slag-steel separator is arranged in getting rid of the high oxidability slag in the molten steel to the high oxidability slag that restraines initial smelting stove gets into the refining process, influences follow-up deoxidation alloying operation in the refining furnace. The utility model discloses a set up slag-steel separator, restrained the high oxidability slag of primary refining stove and got into concise process, reduced the contaminated possibility of molten steel, reduced the follow-up alloy consumption that is used for the slag deoxidization.
Description
Technical Field
The utility model belongs to the technical field of the metallurgy, a clean steel smelting system is related to.
Background
The current typical clean steel smelting process comprises the following steps: molten iron pretreatment → primary smelting furnace (electric arc furnace or converter) → external refining (LF/VD/VOD/RH) → continuous casting.
1) During the primary smelting furnace tapping process, the slag tapping is controlled by measures such as a slag blocking ball, a sliding plate for slag blocking, slag tapping detection and the like. However, practical application shows that a large amount of steel slag still enters the refining process. The primary smelting steel slag with high oxidizability enters a refining process and can pollute molten steel. Oxygen in deoxidized alloy reducing slag is usually adopted to change the physical and chemical properties of the steel slag, but the production cost is increased;
2) in the molten steel at the smelting end point of the primary smelting furnace, 400-800 ppm of O is usually dissolved. Therefore, a large amount of deoxidation alloy is added to deoxidize the molten steel in the tapping process of the primary smelting furnace. On the one hand, the yield of the alloy is reduced; in addition, the alloy elements are combined with oxygen to generate a large amount of inclusions which are difficult to remove, so that the quality of molten steel is influenced;
3) when smelting high-quality steel, refining facilities such as LF + VD or LF + RH are often adopted in a duplex way, and the treatment period of a single procedure reaches more than 30min, so that the natural temperature drop of molten steel is increased;
4) the turnover mode of loading molten steel by a steel ladle and hoisting the steel ladle by a large-scale casting crane is adopted, so that the design of a bearing structure of a workshop is complicated, and the investment is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present application aims to provide a clean steel smelting system to prevent the highly-oxidized steel slag in the primary furnace from entering the subsequent refining process, and to reduce the alloy consumption for deoxidizing the steel slag.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a clean steel smelting system comprises a primary smelting furnace, a slag-steel separation device, a refining furnace and a continuous casting ladle which are sequentially arranged along the flowing direction of molten steel, wherein the slag-steel separation device is used for removing high-oxidizability steel slag in the molten steel so as to reduce the alloy consumption for deoxidizing and alloying the steel slag in the refining furnace.
Optionally, the slag-steel separation device further comprises a first diversion trench arranged between the primary smelting furnace and the slag-steel separation device, and a second diversion trench arranged between the slag-steel separation device and the refining furnace.
Optionally, one end of the first diversion trench is positioned below the steel tapping hole of the primary smelting furnace, and the other end of the first diversion trench is positioned above the slag-steel separation device; one end of the second diversion trench is positioned below the steel tapping hole of the slag-steel separation device, and the other end of the second diversion trench is positioned above the refining furnace.
Optionally, the first guide groove and the second guide groove are arranged obliquely downwards along the flowing direction of the molten steel, and the outlet end is open.
Optionally, the upper part of the first diversion trench, the slag-steel separation device and/or the second diversion trench is provided with a heat insulation cover.
Optionally, the upper part of the slag-steel separating device is provided with a slag outlet, and a slag tank is arranged below the slag outlet so that steel slag overflowing from the slag outlet enters the slag tank.
Optionally, the refining furnace is an induction heating vacuum refining furnace, and a steel tapping hole leading to the continuous casting ladle is formed in the bottom of the refining furnace.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a set up slag-steel separator, restrained the high oxidability slag of primary refining stove and got into concise process, reduced the contaminated possibility of molten steel, reduced the alloy consumption who is used for the slag deoxidization.
2. The utility model discloses can realize carrying out the deoxidation alloying operation in the refining furnace, and then promote the alloy yield, also can follow the source and restrain oxide inclusion formation.
3. The utility model discloses cancel traditional refining facilities such as LF + VD or LF + RH pair, adopt induction heating vacuum refining furnace, can realize vacuum degassing and molten steel temperature adjustment operation in step, reduced the natural temperature drop of concise cycle and molten steel.
4. The utility model discloses well molten steel is smelting whole journey no longer through the ladle turnover, has reduced workshop factory building post bearing demand, is favorable to reducing the civil engineering investment.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the clean steel smelting system of the present invention.
Reference numerals: the steel slag separating device comprises a primary smelting furnace 1, a first diversion trench 2, a slag-steel separating device 3, a second diversion trench 4, a refining furnace 5, a continuous casting ladle 6, a slag pot 7, a slag-steel separating device steel tapping hole 8, a slag-steel separating device slag tapping hole 9, a primary smelting furnace steel tapping hole 10, an induction heating system 11 and a refining furnace steel tapping hole 12.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1, a clean steel smelting system comprises a primary smelting furnace 1, a slag-steel separating device 3, a refining furnace 5 and a continuous casting ladle 6 which are sequentially arranged along the flowing direction of molten steel, wherein the slag-steel separating device 3 is used for removing high-oxidizability steel slag in the molten steel so as to inhibit the high-oxidizability steel slag of the primary smelting furnace from entering a refining process, the deoxidation alloying operation is not performed in the primary smelting furnace tapping process, and the alloying operation is performed after the vacuum carbon deoxidation in the refining furnace is finished.
The utility model discloses a set up slag-steel separator 3, restrained the high oxidability slag of primary smelting stove 1 and got into concise process, reduced the contaminated possibility of molten steel, reduced the alloy consumption who is used for the slag deoxidization.
In order to no longer have enough to meet the need the molten steel through the ladle in the whole process of smelting, the utility model discloses a guiding gutter carries the molten steel, sets up first guiding gutter 2 between just smelting stove 1 and slag-steel separator 3 promptly, sets up second guiding gutter 4 between slag-steel separator 3 and refining furnace 5. The utility model discloses a set up the guiding gutter, still reduced workshop factory building post bearing demand, be favorable to reducing the civil engineering investment.
The utility model provides a first guiding gutter 2 and second guiding gutter 4 are the slant and set up down along the molten steel flow direction, and the exit end opens to the gravity that realizes the guiding gutter and utilize molten steel self realizes flowing. Specifically, one end of the first diversion trench 2 is positioned below the steel tapping hole of the primary smelting furnace 1, and the other end is positioned above the slag-steel separating device 3; one end of the second diversion trench 4 is positioned below the steel tapping hole of the slag-steel separating device 3, and the other end is positioned above the refining furnace 5.
In the method, the upper parts of the first guide groove 2, the slag-steel separating device 3 and/or the second guide groove 4 are/is provided with a heat insulation cover made of refractory materials so as to reduce the natural temperature drop of the molten steel.
The utility model discloses be equipped with the slag notch on the upper portion of slag-steel separator 3, the slag notch below is equipped with slag ladle 7 so that get into slag ladle 7 from the slag-steel separator slag notch 9 steel slag that overflows, has realized the automatic collection of slag.
The refining furnace 5 in the utility model is an induction heating vacuum refining furnace, and the bottom of the refining furnace 5 is provided with a refining furnace steel tapping hole 12 leading to a continuous casting ladle 6. The utility model discloses can realize vacuum degassing and molten steel temperature adjustment operation in step in refining process.
A clean steel smelting method comprises the following steps: primary smelting, deslagging and refining, wherein the deslagging is used for removing high-oxidability steel slag in molten steel before refining, and deoxidation alloying operation is not carried out during primary smelting steel tapping and is carried out during refining. The deoxidation alloying operation comprises the following steps: during refining, the carbon deoxidation is carried out in a vacuum environment, and the alloying operation is carried out after the carbon deoxidation is finished.
In order to reduce the refining cycle, restrain the natural temperature drop of molten steel, the utility model discloses according to the requirement real time adjustment molten steel refining's of follow-up continuous casting temperature, vacuum degassing and molten steel temperature adjustment operation are realized in step to refining process.
The high oxidizability steel slag in the middle molten steel of the utility model is removed by the slag-steel separating device 3, and the tapping speed and the steel feeding speed of the slag-steel separating device 3 are equivalent.
When the smelting in the primary smelting furnace 1 is finished, the molten steel flows out from a steel outlet of the primary smelting furnace, is subjected to slag removal by the slag-steel separation device 3 and then enters the refining furnace 5. After the refining is finished, the molten steel flows into the continuous casting ladle 6 from a steel outlet at the bottom of the refining furnace.
The slag-steel separating device 3 prevents the high-oxidizability steel slag of the primary smelting furnace 1 from entering a refining process, reduces the possibility of pollution of the steel liquid, and reduces the alloy consumption for deoxidizing the steel slag; the alloying operation is carried out after the vacuum carbon deoxidation in the refining furnace is finished, so that the alloy yield is improved, and the generation of oxide inclusions is also inhibited from the source; the vacuum degassing and molten steel temperature adjusting operation is synchronously realized in the refining process, and the refining period and the natural temperature drop of the molten steel are reduced. In addition, molten steel does not need to be circulated by steel ladles in the whole smelting process, the bearing requirement of workshop plant columns is favorably reduced, and the civil engineering investment is reduced.
Examples
The utility model provides a clean steel smelting system, includes that refining furnace 1, first guiding gutter 2, slag-steel separator 3, second guiding gutter 4, refining furnace 5, continuous casting package 6 and slag ladle 7, wherein refining furnace 5 adopts induction heating vacuum refining furnace.
The first diversion trench 2 is connected with the primary smelting furnace 1 and the slag-steel separating device 3, one end of the first diversion trench is positioned below the primary smelting furnace steel tapping hole 10, and the other end of the first diversion trench is positioned above the slag-steel separating device 3.
The second diversion trench 4 is connected with the slag-steel separation device 3 and the refining furnace 5, one end of the second diversion trench is positioned below the steel outlet 8 of the slag-steel separation device, and the other end of the second diversion trench is positioned above the refining furnace 5.
When the smelting in the primary smelting furnace 1 is finished, the molten steel flows out from a steel outlet 10 of the primary smelting furnace, passes through the first diversion trench 2 and enters the slag-steel separation device 3. After the molten steel in the slag-steel separating device 3 reaches a certain depth, the steel outlet 8 of the slag-steel separating device is opened, and the flow speed of the steel outlet 8 of the slag-steel separating device is equivalent to the steel outlet speed of the steel outlet 10 of the primary smelting furnace 1.
The molten steel flowing out of the steel tapping hole 8 of the slag-steel separating device enters the refining furnace 5 through the second diversion trench 4; when the amount of the steel slag in the slag-steel separating device 3 exceeds the capacity of the slag-steel separating device, the steel slag overflows from a slag outlet 9 of the slag-steel separating device into a slag tank 7.
The deoxidation alloying operation is not carried out in the primary refining furnace tapping process, and alloying is carried out after the vacuum carbon deoxidation period in the refining furnace 5 is finished. In the refining process, the temperature of the molten steel is adjusted in time by the induction heating system 11 of the refining furnace 5 according to the requirement of continuous casting corresponding to steel grades. After the refining is completed, the molten steel flows into the continuous casting ladle 6 from the refining furnace tap hole 12 located at the bottom of the refining furnace.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (7)
1. A clean steel smelting system is characterized in that: the steel slag deoxidation and alloying device comprises a primary smelting furnace, a slag steel separation device, a refining furnace and a continuous casting ladle which are sequentially arranged along the flowing direction of molten steel, wherein the slag steel separation device is used for removing high-oxidability steel slag in the molten steel so as to reduce the alloy consumption for deoxidation and alloying of the steel slag in the refining furnace.
2. The clean steel smelting system according to claim 1, wherein: the slag-steel separation device is characterized by also comprising a first diversion trench arranged between the primary smelting furnace and the slag-steel separation device, and a second diversion trench arranged between the slag-steel separation device and the refining furnace.
3. The clean steel smelting system according to claim 2, wherein: one end of the first diversion trench is positioned below a steel tapping hole of the primary smelting furnace, and the other end of the first diversion trench is positioned above the slag-steel separation device; one end of the second diversion trench is positioned below the steel tapping hole of the slag-steel separation device, and the other end of the second diversion trench is positioned above the refining furnace.
4. The clean steel smelting system according to claim 2, wherein: the first guide groove and the second guide groove are obliquely arranged downwards along the flowing direction of the molten steel, and the outlet ends of the first guide groove and the second guide groove are open.
5. The clean steel smelting system according to claim 2, wherein: and the upper parts of the first diversion trench, the slag-steel separation device and/or the second diversion trench are/is provided with a heat insulation cover.
6. The clean steel smelting system according to claim 1, wherein: the upper part of the slag-steel separating device is provided with a slag outlet, and a slag tank is arranged below the slag outlet so that steel slag overflowing from the slag outlet enters the slag tank.
7. The clean steel smelting system according to claim 1, wherein: the refining furnace is an induction heating vacuum refining furnace, and the bottom of the refining furnace is provided with a steel tapping hole leading to a continuous casting ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202120997774.1U CN214781960U (en) | 2021-05-11 | 2021-05-11 | Clean steel smelting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120997774.1U CN214781960U (en) | 2021-05-11 | 2021-05-11 | Clean steel smelting system |
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| CN214781960U true CN214781960U (en) | 2021-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106196A (en) * | 2021-05-11 | 2021-07-13 | 中冶赛迪工程技术股份有限公司 | Clean steel smelting system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106196A (en) * | 2021-05-11 | 2021-07-13 | 中冶赛迪工程技术股份有限公司 | Clean steel smelting system and method |
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