CN114799105A - Crystallizer molten steel auxiliary cooling device and using method - Google Patents
Crystallizer molten steel auxiliary cooling device and using method Download PDFInfo
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- CN114799105A CN114799105A CN202210484760.9A CN202210484760A CN114799105A CN 114799105 A CN114799105 A CN 114799105A CN 202210484760 A CN202210484760 A CN 202210484760A CN 114799105 A CN114799105 A CN 114799105A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/112—Treating the molten metal by accelerated cooling
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Abstract
The invention relates to a crystallizer molten steel auxiliary cooling device and a using method thereof, wherein the crystallizer molten steel auxiliary cooling device comprises a heat exchanger, a first circulating conduit communicated with a medium outlet of the heat exchanger, and a second circulating conduit communicated with a medium inlet of the heat exchanger, metal cooling liquid is filled in the first circulating conduit and the second circulating conduit, a circulating pump device is arranged on the first circulating conduit and/or the second circulating conduit, one end of the first circulating conduit, which is far away from the heat exchanger, is connected with one end of the second circulating conduit, which is far away from the heat exchanger, through a cooling body positioned below the molten steel surface, and a channel communicated with the first circulating conduit and the second circulating conduit is arranged in the cooling body. The invention creatively applies the lead-bismuth alloy and the gallium-indium alloy to the cooling of the molten steel, and realizes the cooling of the molten steel in the crystallizer from inside to outside; the temperature of the molten steel is reduced in a heat conduction mode, the superheat degree of the molten steel is reduced through phase change, the problems of molten steel segregation and looseness are solved to the maximum extent, and the internal quality of a continuous casting billet is improved.
Description
Technical Field
The invention relates to the technical field of molten steel cooling, in particular to an auxiliary cooling device for molten steel in a crystallizer and a using method thereof.
Background
In the process of alloy steel continuous casting technology, as a result of natural separation and crystallization in the solidification process, center segregation and center shrinkage porosity are main defects influencing the quality of continuous casting billets and can influence the quality of rolled materials. Particularly for medium-high carbon alloy steel, the problem that the continuous casting process needs to solve is that the central segregation and the central shrinkage porosity are reduced or eliminated. Reasonable initial and final stirring parameters and the adoption of soft reduction can effectively improve the low-power quality and the center segregation index of the casting blank, but only can reduce the weight and cannot fundamentally solve the problem.
Therefore, reasonable control of cooling is an important means for solving the segregation of the casting blank, and the key for solving the problem is that almost all the continuous casting machines adopt a crystallizer for cooling from outside to inside, the center segregation and the looseness are serious, and the bidirectional cooling from inside to outside and from outside to inside can not be realized in the continuous casting solidification process. The cooling from inside to outside is realized, a crystallizer water cooling mode cannot be adopted, and due to internal cooling, if water cooling is adopted, a cooling body is buried in molten steel, once leakage occurs, safety accidents such as explosion and the like occur, and a feasible method is not available, so that the method is not feasible.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the crystallizer molten steel auxiliary cooling device and the using method thereof, which can realize the cooling of the molten steel from inside to outside, reduce the temperature of the molten steel in a heat conduction mode, reduce the superheat degree of the molten steel in a phase-changing mode, solve the problems of liquid steel segregation and looseness to the maximum extent and improve the internal quality of a continuous casting billet.
The invention is realized by the following technical scheme, and provides a crystallizer molten steel auxiliary cooling device which comprises a heat exchanger, a first circulating conduit communicated with a medium outlet of the heat exchanger, and a second circulating conduit communicated with a medium inlet of the heat exchanger, wherein metal cooling liquid is filled in the first circulating conduit and the second circulating conduit, a circulating pump device is installed on the first circulating conduit and/or the second circulating conduit, one end of the first circulating conduit, which is far away from the heat exchanger, is connected with one end of the second circulating conduit, which is far away from the heat exchanger, through a cooling body positioned below the molten steel surface, and a channel communicated with the first circulating conduit and the second circulating conduit is arranged in the cooling body.
Preferably, the part of the first circulating conduit extending below the liquid level of the steel and the part of the second circulating conduit extending below the liquid level of the steel are both coated with a refractory protective sleeve. This optimization scheme is through setting up resistant material protective case, avoids first circulation pipe and second circulation pipe to receive the high temperature of molten steel and pierce through to the leakage of coolant liquid has been avoided.
Preferably, the first circulation conduit and the second circulation conduit both extend in a vertical direction, and the heat exchanger is located directly above the crystallizer. The setting of this optimization scheme for the flow of coolant liquid is more smooth and easy, avoids increasing the flow resistance because the bent angle is too much.
The scheme also provides a using method of the crystallizer molten steel auxiliary cooling device, which comprises the following steps: placing the cooling body in a crystallizer, fixing the cooling body below the liquid level of steel, and starting a circulating pump device to enable the metal cooling liquid to circulate in a closed loop formed by a heat exchanger, a first circulating conduit, the cooling body and a second circulating conduit; when the continuous casting device works, the heat of the molten steel is conducted out through the heat exchanger, the cooling speed is controlled in a mode of controlling the speed of the metal cooling liquid, a layer of cold steel is solidified on the surface of the cooling body, the cold steel forms a temperature gradient, the temperature of the molten steel is reduced in a heat conduction mode, the superheat degree of the molten steel is reduced in a phase-changing mode, and the internal quality of a continuous casting billet is improved.
Preferably, the metal cooling liquid is liquid lead-bismuth alloy or gallium-indium alloy, the two alloys have low melting point, high boiling point, large specific heat capacity and good heat conductivity, and do not react with molten steel chemically, so that the cooling effect is ensured, and the use safety is ensured.
The invention has the beneficial effects that: the lead-bismuth alloy and the gallium-indium alloy which are used for nuclear reactor cooling and computer chip heat dissipation are creatively applied to molten steel cooling, so that the molten steel in the crystallizer is cooled from inside to outside, and the bidirectional cooling of the molten steel in the crystallizer is guaranteed; the used cooling liquid is liquid metal cooling liquid with low melting point, high boiling point, large specific heat capacity and good heat conductivity, the metal cooling liquid cannot have chemical reaction with the molten steel, potential safety hazards do not exist, the cooling liquid flows in a closed manner, and the consumption is very small; the temperature of the molten steel is reduced in a heat conduction mode, the superheat degree of the molten steel is reduced through phase change, the problems of molten steel segregation and looseness are solved to the maximum extent, and the internal quality of a continuous casting billet is improved; the installation is convenient, the operation is simple and the operability is high.
Drawings
FIG. 1 is a schematic structural view of the present invention;
shown in the figure:
1. the device comprises a heat exchanger, 2, metal cooling liquid, 3, a first circulating conduit, 4, a circulating pump device, 5, a protective slag surface, 6, a refractory protective sleeve, 7, a steel liquid surface, 8, a crystallizer, 9 and a cooling body.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments. The processing equipment or devices not specifically mentioned in the examples are conventional equipment or devices in the art, and the technical means not specifically mentioned in the examples of the present invention are conventional means well known to those skilled in the art.
As shown in fig. 1, the auxiliary cooling device for molten steel in a crystallizer comprises a heat exchanger 1, a first circulation conduit 3 communicated with a medium outlet of the heat exchanger, and a second circulation conduit communicated with a medium inlet of the heat exchanger, wherein metal cooling liquid 2 is filled in the first circulation conduit and the second circulation conduit, the metal cooling liquid in the embodiment is liquid lead-bismuth alloy or gallium-indium alloy, and has the advantages of low melting point, high boiling point, large specific heat capacity, good thermal conductivity, and no chemical reaction with the molten steel.
And the first circulating conduit and/or the second circulating conduit are/is provided with a circulating pump device 4, the circulating pump device 4 of the embodiment is arranged on the second circulating conduit, and the metal cooling liquid is cooled when passing through the heat exchanger.
One end of the first circulation conduit, which is far away from the heat exchanger, is connected with one end of the second circulation conduit, which is far away from the heat exchanger, through a cooling body 9 positioned below the liquid steel level 7, and a channel for communicating the first circulation conduit with the second circulation conduit is arranged in the cooling body 9. In order to increase the flow effect of the cooling liquid, the first circulation conduit and the second circulation conduit of the present embodiment both extend in a vertical direction, and the heat exchanger is located directly above the crystallizer 8.
The part of the first circulating conduit extending to the position below the liquid level of the molten steel and the part of the second circulating conduit extending to the position below the liquid level of the molten steel are both coated with a refractory protective sleeve 6, and the refractory protective sleeve is compounded with the first circulating conduit and the second circulating conduit to protect the circulating conduits and prevent the circulating conduits from being burnt by the molten steel to cause leakage of the cooling liquid.
The use method of the crystallizer molten steel auxiliary cooling device comprises the following steps:
placing a cooling body in a crystallizer 8, fixing the cooling body below a molten steel surface 7, starting a circulating pump device above the molten steel surface to ensure that metal cooling liquid circulates in a closed loop formed by a heat exchanger, a first circulating conduit, a cooling body 9 and a second circulating conduit; when the continuous casting device works, the heat of the molten steel is conducted out through the heat exchanger, the cooling speed is controlled in a mode of controlling the speed of the metal cooling liquid, a layer of cold steel is solidified on the surface of the cooling body, the cold steel forms a temperature gradient, the temperature of the molten steel is reduced in a heat conduction mode, the superheat degree of the molten steel is reduced in a phase-changing mode, and the internal quality of a continuous casting billet is improved.
In actual production, the device is applied to continuous casting production of GCr15 bearing steel, gallium-indium alloy is used as cooling liquid to produce continuous casting billets with phi 500mm sections, a crystallizer and tail end electric stirring are matched for use, secondary cooling is carried out in a weak cooling mode, the superheat degree is controlled to be 15-25 ℃, the drawing speed is 0.35m/min, a light reduction technology is not adopted, and the central carbon segregation index of the continuous casting billets can reach 0.97-1.03.
Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present invention and not for limiting the present invention, and 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 changes, modifications, additions or substitutions within the spirit and scope of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and shall also fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a crystallizer molten steel auxiliary cooling device which characterized in that: the device comprises a heat exchanger (1), a first circulation conduit (3) communicated with a medium outlet of the heat exchanger, and a second circulation conduit communicated with a medium inlet of the heat exchanger, wherein metal cooling liquid (2) is filled in the first circulation conduit and the second circulation conduit, a circulation pump device (4) is installed on the first circulation conduit and/or the second circulation conduit, one end of the first circulation conduit, which is far away from the heat exchanger, and one end of the second circulation conduit, which is far away from the heat exchanger, are connected through a cooling body (9) positioned below a steel liquid level (7), and a channel communicated with the first circulation conduit and the second circulation conduit is arranged in the cooling body (9).
2. The auxiliary cooling device for the molten steel in the crystallizer according to claim 1, wherein: the part of the first circulating conduit extending to the position below the liquid level of the steel and the part of the second circulating conduit extending to the position below the liquid level of the steel are both coated with a refractory protective sleeve (6).
3. The auxiliary cooling device for the molten steel in the crystallizer according to claim 1, wherein: the first circulating conduit and the second circulating conduit extend along the vertical direction, and the heat exchanger is positioned right above the crystallizer (8).
4. The use method of the auxiliary cooling device for the molten steel in the crystallizer as claimed in any one of claims 1 to 3, is characterized in that: placing the cooling body in a crystallizer, fixing the cooling body below the liquid level of steel, and starting a circulating pump device to enable the metal cooling liquid to circulate in a closed loop formed by a heat exchanger, a first circulating conduit, the cooling body and a second circulating conduit; when the continuous casting device works, the heat of the molten steel is conducted out through the heat exchanger, the cooling speed is controlled in a mode of controlling the speed of the metal cooling liquid, a layer of cold steel is solidified on the surface of the cooling body, the cold steel forms a temperature gradient, the temperature of the molten steel is reduced in a heat conduction mode, the superheat degree of the molten steel is reduced in a phase-changing mode, and the internal quality of a continuous casting billet is improved.
5. The use method of the auxiliary cooling device for the molten steel in the crystallizer as claimed in claim 4, is characterized in that: the metal cooling liquid is liquid lead bismuth alloy or gallium indium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210484760.9A CN114799105A (en) | 2022-05-06 | 2022-05-06 | Crystallizer molten steel auxiliary cooling device and using method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210484760.9A CN114799105A (en) | 2022-05-06 | 2022-05-06 | Crystallizer molten steel auxiliary cooling device and using method |
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| CN114799105A true CN114799105A (en) | 2022-07-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009051134A1 (en) * | 2009-10-28 | 2011-05-05 | Siemens Aktiengesellschaft | Device for utilizing waste heat of metal melt in continuous casting plant, comprises distributor for providing metal melt, where the metal melt is guided from the distributor into a mold so that the metal melt is molded in strand form |
| CN102974794A (en) * | 2012-11-23 | 2013-03-20 | 莱芜钢铁集团有限公司 | Device and method for reducing superheat degree of molten steel of continuous casting ladle or intermediate ladle |
| WO2015132237A1 (en) * | 2014-03-06 | 2015-09-11 | Inteco Special Melting Technologies Gmbh | Method and plant for cooling liquid-cooled moulds for metallurgical processes |
| WO2016029901A1 (en) * | 2014-08-26 | 2016-03-03 | Peter Valentin | Method for extruding a metal, in particular a steel, and extrusion device |
| KR20160073680A (en) * | 2014-12-17 | 2016-06-27 | 주식회사 포스코 | Forecasting apparatus for solid matter and forecasting method or solid matter using the same |
| CN106077547A (en) * | 2016-08-24 | 2016-11-09 | 山东钢铁股份有限公司 | A kind of device and method reducing the crystallizer molten steel degree of superheat |
| KR20200061188A (en) * | 2018-11-23 | 2020-06-02 | 주식회사 포스코 | Mold apparatus for continuous casting process and continuous casting method using the same |
-
2022
- 2022-05-06 CN CN202210484760.9A patent/CN114799105A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009051134A1 (en) * | 2009-10-28 | 2011-05-05 | Siemens Aktiengesellschaft | Device for utilizing waste heat of metal melt in continuous casting plant, comprises distributor for providing metal melt, where the metal melt is guided from the distributor into a mold so that the metal melt is molded in strand form |
| CN102974794A (en) * | 2012-11-23 | 2013-03-20 | 莱芜钢铁集团有限公司 | Device and method for reducing superheat degree of molten steel of continuous casting ladle or intermediate ladle |
| WO2015132237A1 (en) * | 2014-03-06 | 2015-09-11 | Inteco Special Melting Technologies Gmbh | Method and plant for cooling liquid-cooled moulds for metallurgical processes |
| WO2016029901A1 (en) * | 2014-08-26 | 2016-03-03 | Peter Valentin | Method for extruding a metal, in particular a steel, and extrusion device |
| KR20160073680A (en) * | 2014-12-17 | 2016-06-27 | 주식회사 포스코 | Forecasting apparatus for solid matter and forecasting method or solid matter using the same |
| CN106077547A (en) * | 2016-08-24 | 2016-11-09 | 山东钢铁股份有限公司 | A kind of device and method reducing the crystallizer molten steel degree of superheat |
| KR20200061188A (en) * | 2018-11-23 | 2020-06-02 | 주식회사 포스코 | Mold apparatus for continuous casting process and continuous casting method using the same |
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