CN112229228A - Multi-level phase change recycling and storing device for heat in continuous casting and steel billet cooling processes - Google Patents
Multi-level phase change recycling and storing device for heat in continuous casting and steel billet cooling processes Download PDFInfo
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- CN112229228A CN112229228A CN202011018996.0A CN202011018996A CN112229228A CN 112229228 A CN112229228 A CN 112229228A CN 202011018996 A CN202011018996 A CN 202011018996A CN 112229228 A CN112229228 A CN 112229228A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/028—Steam generation using heat accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/028—Control arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/007—Systems for reclaiming waste heat including regenerators
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Sustainable Energy (AREA)
- Environmental & Geological Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention relates to a multi-level phase change recovery and storage device for heat in the continuous casting and billet cooling processes, which utilizes a phase change energy storage material to recover and store a large amount of high-temperature heat generated in the continuous casting and high-temperature billet stacking cooling processes in the metallurgical process. The device comprises a phase change recovery energy storage cover, a steel billet conveying device, a steel billet stacking and cooling chamber and a control system in the high-temperature continuous casting process; the phase change recovery energy storage cover in the high-temperature continuous casting process is used for recovering and storing heat energy in the continuous casting process, and the billet stack cooling chamber is used for recovering and storing heat energy in the billet cooling process. The invention has the beneficial effects that: through using the phase change energy storage material in multistage ground, retrieve and store a large amount of heats of releasing in high temperature metal continuous casting process and the steel billet stack cooling process to be used for steam power generation with the heat of retrieving and storing, heat recovery is comparatively abundant, has also improved the utilization ratio of the energy simultaneously.
Description
Technical Field
The invention belongs to the technical field of energy recycling in metallurgical industry, and particularly relates to a multi-level phase change recycling and storing device for heat in continuous casting and billet cooling processes.
Background
With the gradual deepening of the concepts of energy conservation, environmental protection, low consumption and high efficiency into the metallurgical industry, more and more metallurgical enterprises begin to pay attention to the recovery and high-efficiency utilization of resources, so that the raw material investment is reduced, and the production cost is saved.
Continuous casting is continuous casting steel, and compared with the traditional die casting method, the continuous casting method can greatly improve the metal yield and the casting blank quality and save energy, so the method is widely applied to the field of ferrous metallurgy. However, in the continuous casting process, high-temperature metal is exposed in the air for a long time, so that a large amount of heat is dissipated to the surrounding air, and huge waste of waste heat resources is caused. The most common heat recovery methods in the prior art in the continuous casting process are heat pipe waste heat recovery and steam waste heat recovery. The heat pipe waste heat recovery device has the core that the heat pipe is used for recovering waste heat in the continuous casting process, and the medium in the heat pipe is used for transferring the recovered heat, so that the heat pipe waste heat recovery device is applied to other industrial processes; the steam waste heat recovery device is characterized in that water or steam is introduced into the device, and superheated steam is generated in the heat exchange process of the device to realize waste heat collection and reuse. Although the two methods are actually applied to part of the production, they have a common disadvantage that the collected waste heat cannot be stored, so that once the industrial process for utilizing the collected heat is not performed after the process, the collected energy is wasted, and secondary waste is caused.
During the whole metallurgical process, the process of cooling the billet, which reduces the temperature of the billet from the high temperature at the end of rolling to room temperature, also has great heat release. However, the billet cooling methods commonly used in the prior art include stack air cooling, water immersion or spray water cooling and slow cooling. It can be seen that no matter which of the above methods is adopted, the heat in the cooling process is not recovered, and even other resources are utilized to assist the dissipation of the heat, which causes huge energy waste. Although the prior art adopts a heat recovery device, and recovers the heat of the billet cooling process by using other media such as water, air and the like, the recovery efficiency is lower, the timely utilization rate of the recovered energy is not high, and the problems that the recovered energy is stored and the like cannot be well solved all the time. Therefore, there is a need for a waste heat recovery apparatus that is efficient and low-cost and can store the heat collected during the continuous casting and billet cooling processes.
The phase change energy storage material is used as a green environment-friendly carrier of energy, has the advantages of time and space, can realize the asynchronism of the storage and the utilization of the energy in time and space, breaks the space-time limitation of the utilization of secondary energy in the traditional metallurgy field, has very strong practical significance, and is a new idea for the utilization of waste heat in the metallurgy process.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a device for recovering and storing heat in the continuous casting and billet cooling process through multi-level phase change, so as to solve the problem that a large amount of heat is wasted because high-temperature metal is exposed in the air in the metallurgical continuous casting process and the high-temperature billet stacking cooling process in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a multi-level phase change recovery and storage device for heat in the continuous casting and billet cooling processes comprises a phase change recovery energy storage cover, a billet conveying device, a billet stacking and cooling chamber and a control system in the high-temperature continuous casting process; the phase change recovery energy storage cover and the billet stacking cooling chamber are packaged with phase change energy storage materials with different phase change temperatures in the high-temperature continuous casting process;
the phase change recovery energy storage cover covers the continuous casting device in the high-temperature continuous casting process and is used for recovering and storing heat energy in the continuous casting process;
the billet conveying device is arranged behind the continuous casting device and is used for conveying the continuously cast billets to the billet stacking and cooling chamber;
the billet stack cooling chamber is used for recovering and storing heat energy in the billet cooling process.
According to the invention, the billet stacking and cooling chamber is of an internal and external double-layer structure, the inner layer is a two-stage high-temperature phase change recovery energy storage lifting plate, and the outer layer is a three-stage medium-temperature phase change recovery storage wall.
According to the invention, the phase change recovery energy storage cover in the high-temperature continuous casting process comprises a shell, a high-temperature phase change energy storage material and a water pipe;
the high-temperature phase change energy storage material is packaged in the shell; the water pipe is coiled in a zigzag manner and is inserted into the phase change energy storage material;
the high-temperature phase change energy storage material is aluminum-silicon alloy, and the phase change temperature is 577-800 ℃.
According to the invention, the two-stage high-temperature phase change recovery energy storage lifting plate comprises a shell, a high-temperature phase change energy storage material and a water pipe;
the high-temperature phase change energy storage material is packaged in the shell; the water pipe is coiled in a shape of a Chinese character hui and is inserted into the high-temperature phase change energy storage material;
the high-temperature phase change energy storage material is aluminum-silicon alloy, and the phase change temperature is 577-800 ℃;
the three-stage medium-temperature phase change recovery energy storage wall comprises a shell, a medium-temperature phase change energy storage material and a water pipe;
the medium-temperature phase-change energy storage material is packaged in the shell; the water pipe is coiled in a shape of a Chinese character hui and is inserted into the medium-temperature phase-change energy storage material;
the medium-temperature phase-change energy storage material is aluminum-tin alloy, and the phase-change temperature of the medium-temperature phase-change energy storage material is 230 ℃.
According to the invention, the top of the billet stacking cooling chamber is provided with the heat-insulating wall which can move;
the shell of the second-stage high-temperature phase change recovery energy storage lifting plate is of a uncovered cuboid structure, and a hollow area is formed in the middle after the high-temperature phase change energy storage material is packaged in the shell, and is used for placing steel billets.
According to the invention, the billet transport device comprises a billet transport box and a crown block; the crown block is used for hoisting the steel billet transport box filled with the steel billets to the billet stacking and cooling chamber.
According to the invention, a flame cutter is arranged above the tail end of the phase change recovery energy storage cover in the high-temperature continuous casting process, and the flame cutter is used for cutting a steel billet;
the upper surface of the tail end of the phase change recovery energy storage cover in the high-temperature continuous casting process is provided with a flame cutting track groove with the width of 10mm, and the flame cutting track groove is used for finishing cutting of continuous casting metal by a flame cutter.
According to the invention, the outer surface of the phase change recovery energy storage cover is wrapped with the thermal insulation material in the high-temperature continuous casting process, and the thermal insulation material is wrapped outside the three-stage medium-temperature phase change recovery storage wall.
According to the invention, the control system comprises a temperature detection device and a control device; the temperature detection device is used for detecting the temperature in the secondary high-temperature phase change recovery energy storage lifting plate, converting a measured temperature signal into an electric signal and transmitting the electric signal to the control device;
and after the control device receives the electric signal of the temperature detection device, the control device controls the second-stage high-temperature phase change recovery energy storage lifting plate to ascend and descend.
According to the invention, the heat recovered and stored by the device is used for heating the cooling water in the water pipes in the phase change recovery energy storage cover, the secondary high-temperature phase change recovery energy storage lifting plate and the tertiary medium-temperature phase change recovery energy storage wall in the high-temperature continuous casting process into superheated steam, and the superheated steam is used for steam power generation.
(III) advantageous effects
The invention has the beneficial effects that:
the multistage phase change recovery and storage device for the continuous casting and billet cooling process heat provided by the invention recovers and stores the high-temperature and medium-temperature billet heat in multiple stages by using the phase change energy storage materials with different attributes, and aims to fundamentally break the limitation that heat can be taken and used at this point, thereby realizing efficient matching utilization of the heat in time and space.
According to the multi-level phase change recovery and storage device for the heat in the continuous casting and billet cooling processes, the phase change energy storage materials are used in a multi-level mode, and the energy storage materials with different eutectic temperatures are respectively used for recovering and storing a large amount of heat released in the high-temperature metal continuous casting process and the billet stacking and cooling process, so that the heat is fully recovered, the utilization rate of energy is greatly improved, and the phase change energy storage materials can be repeatedly used for multiple times. In addition, the device of the invention uses the recovered and stored heat for steam power generation, thereby solving the problem of secondary waste caused by the fact that the collected waste heat is not stored in the prior art.
On the other hand, the multi-level phase change recovery and storage device for heat in the continuous casting and billet cooling processes also solves the problem of high workshop temperature caused by direct transfer of heat released in the continuous casting and billet stacking cooling processes to a workshop to a certain extent, and improves the workshop environment at the same time.
On the other hand, the temperature of the steel billet stack is very high, the cooling speed in a workshop is very slow, and the production efficiency is low; the water cooling not only needs a large amount of water resources, but also causes brittle fracture of the steel billet due to the over-fast cooling. The device of the invention utilizes the heat released by the multi-stage recovery of the phase change energy storage material and the stack cooling of the steel billet, can relatively quickly improve the cooling rate of the steel billet without influencing the organization structure and the mechanical property of the steel billet, thereby improving the production efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a multi-level phase transition recovery and storage device for heat generated during continuous casting and billet cooling;
FIG. 2 is a cross-sectional structural view of a phase change recovery energy storage cap during high temperature continuous casting;
FIG. 3 is a schematic view of a flame cut trace slot;
fig. 4 is a plan view of the billet stack cooling chamber.
[ reference numerals ]
1: a continuous casting device;
2: the energy storage cover is recovered in a phase change manner in the high-temperature continuous casting process;
3: a flame cutter;
4: a billet transport box;
5: a crown block;
6: a heat preservation wall;
7: a control system;
8: a secondary high-temperature phase change recovery energy storage lifting plate;
9: a three-stage medium-temperature phase change recovery storage wall;
10: a water pipe inlet;
11: an outlet of the water pipe;
12: a water pipe;
13: and (4) cutting a track groove by fire.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The phase-change energy storage technology aims at absorbing or releasing a large amount of latent heat by utilizing phase-change energy storage materials including inorganic salts, organic non-metals, alloys and the like in the process of isothermal phase-change so as to realize the storage and utilization of heat. The phase change energy storage material has higher energy storage density: the heat storage capacity of each unit volume is 5-14 times of that of sensible heat storage, and the phase change energy storage material also has the special advantages of stable energy transmission process, easy matching with an operation system and the like, and is widely applied to the field of heat energy storage and conversion.
The invention adopts the phase-change energy storage material to carry out multi-level phase change recovery and storage of heat in the continuous casting and billet cooling processes, thereby solving the problem that energy sources can not be matched and utilized in time and space. The invention innovatively provides a concept of recovering and storing heat in the continuous casting and billet cooling process by using a phase change energy storage principle, and designs a multi-level phase change recovery and storage device for heat in the continuous casting and billet cooling process. The heat of the high-temperature and medium-temperature steel billets is recycled and stored in multiple stages by using the phase-change energy storage materials with different properties, so that the limitation that the heat can be taken and used at the same place is radically broken, and the matching utilization of the heat in time and space is further realized.
This application is used for retrieving a large amount of heats that produce in continuous casting and the steel billet cooling process with phase change energy storage material, can get up heat energy storage when phase change energy storage material takes place the phase transition to release the energy of storage again when needing. Because the phase change energy storage material can maintain the temperature constant in the phase change process, the system is very stable in the heat absorption or heat release process, and the research and the utilization are convenient.
Example 1:
as shown in fig. 1 to 4, the present invention provides a multi-stage phase change recovery and storage device for heat in continuous casting and billet cooling processes, which comprises a phase change recovery energy storage cover 2 in high-temperature continuous casting process, a billet transportation device, a billet stacking and cooling chamber and a control system 7;
the billet stacking and cooling chamber is of an inner-outer double-layer structure, the inner layer is a second-level high-temperature phase change recovery energy storage lifting plate 8, and the outer layer is a third-level medium-temperature phase change recovery storage wall 9.
The phase change recovery energy storage cover 2 covers the continuous casting device 1 in the high-temperature continuous casting process, and recovers and stores heat energy in the continuous casting process;
the billet steel conveying device is arranged behind the continuous casting device 1 and conveys the continuously cast billet steel to a billet steel stacking and cooling chamber;
the billet stack cooling chamber is used for recovering and storing heat energy in the billet cooling process.
The heat recovery of the multi-level phase change recovery and storage device in the whole continuous casting and billet cooling process aims at the production process of 'continuous casting-cutting-transportation-stacking cooling' of steel: high-temperature steel is continuously cast on the continuous casting device 1, and enters the phase change recovery energy storage cover 2 for primary high-temperature heat recovery and storage after being straightened. The phase change recovery energy storage cover 2 covers the whole straight billet section of the continuous casting device 1 in the high-temperature continuous casting process, and continuously cast billets are wrapped in the cover for full heat recovery and storage; the steel finishes the first-stage heat energy recovery and storage through the phase change recovery energy storage cover 2 in the high-temperature continuous casting process, is cut and stacked orderly by the flame cutter 3, is transported to a billet stacking cooling chamber by the billet transportation device, and carries out the second-stage and third-stage heat energy recovery and storage in the second-stage high-temperature phase change recovery energy storage lifting plate 8 and the third-stage medium-temperature phase change recovery storage wall 9 respectively, and finishes the final cooling.
The flame cutter 3 is used for cutting a steel billet and is arranged above the tail end of the phase change recovery energy storage cover 2 in the high-temperature continuous casting process. Besides the high-temperature heat of the steel billet, the phase change recovery energy storage cover 2 can also recover and store the high-temperature heat emitted by the flame cutter 3 in the high-temperature continuous casting process.
The upper surface of the tail end of the phase change recovery energy storage cover 2 in the high-temperature continuous casting process is provided with a flame cutting track groove 13 with the width of 10mm so as to finish the cutting of continuous casting metal by the flame cutter 3.
The phase change recovery energy storage cover 2 in the high-temperature continuous casting process comprises a shell, a high-temperature phase change energy storage material and a water pipe 12; the high-temperature phase change energy storage material is packaged in the shell; the water pipe 12 is coiled in a zigzag manner and is inserted into the high-temperature phase change energy storage material;
the high-temperature phase change energy storage material packaged in the shell is preferably aluminum-silicon alloy, and the phase change temperature range of the aluminum-silicon alloy is 577-800 ℃. The aluminum-silicon alloy is preferably hypereutectic aluminum-silicon alloy and eutectic aluminum-silicon alloy, and the hypereutectic aluminum-silicon alloy and the eutectic aluminum-silicon alloy are different in silicon content. The content of silicon in the eutectic aluminum-silicon alloy is 12 percent, and the phase transition temperature is 577 ℃. When the silicon content in the silicon-aluminum alloy exceeds 12%, hypereutectic aluminum-silicon alloy is formed, the higher the silicon element content in the hypereutectic aluminum-silicon alloy is, the higher the phase transition temperature is, and the corresponding latent heat of phase transition is increased.
During melting/solidification of hypereutectic aluminum silicon alloys, the dissolution/formation of primary silicon above the temperature of 577 ℃ and the eutectic reaction at 577 ℃ are also included. The maximum phase transition temperature of the hypereutectic silicon-aluminum alloy selected by the invention is 800 ℃, and the content of silicon is 35%.
It should be noted that, in the following description of embodiments, eutectic aluminum-silicon alloy is used as the high-temperature phase change energy storage material.
Preferably, trace elements such as Cu, Fe, Ni, and Ti may be added to the silicon-aluminum alloy to improve the stability of the high-temperature phase change energy storage material system and enhance the oxidation resistance, and it should be noted that the stabilizer has a small influence on the phase change temperature of the phase change energy storage material and only plays a role in adjusting the stability.
Further, the steel billet transportation device comprises a steel billet transportation box 4 and a crown block 5; the crown block 5 is used for hoisting the billet transport box 4 filled with the billet to the billet stacking and cooling chamber.
The secondary high-temperature phase change recovery energy storage lifting plate 8 comprises a shell, a high-temperature phase change energy storage material and a water pipe 12;
the high-temperature phase change energy storage material is packaged in the shell; the water pipe 12 is coiled in a zigzag shape and inserted into the high-temperature phase change energy storage material.
Similar to the composition structure of the phase change recovery energy storage cover 2 and the second-stage high-temperature phase change recovery energy storage lifting plate 8 in the high-temperature continuous casting process, the three-stage medium-temperature phase change recovery energy storage wall 9 also comprises a shell, a medium-temperature phase change energy storage material and a water pipe 12; likewise, the medium-temperature phase-change energy storage material is packaged in the shell; the water pipe 12 is coiled in a zigzag manner and inserted into the medium-temperature phase-change energy storage material.
Preferably, the medium-temperature phase-change energy storage material is an eutectic aluminum tin phase-change energy storage material, the phase-change temperature is 230 ℃, and medium-temperature heat above 230 ℃ can be well recycled and stored.
The shell of the second-stage high-temperature phase change recovery energy storage lifting plate 8 is of an uncovered cuboid structure, and a hollow area is formed in the middle after high-temperature phase change energy storage materials are packaged in the shell, and is used for placing steel billets.
The multi-stage phase change recovery and storage device for the heat in the continuous casting and billet cooling processes fully recovers and stores a large amount of heat released in the high-temperature metal continuous casting process and the billet stacking cooling process by using energy storage materials with different phase change temperatures respectively.
The hot multistage phase transition of continuous casting and steel billet cooling process of this embodiment is retrieved and storage device, carries out first order high temperature heat recovery and storage in high temperature continuous casting process phase transition recovery energy storage cover 2, and what mainly retrieved and stored is the high temperature heat of high temperature continuous casting in-process. The hot multistage phase transition of continuous casting and steel billet cooling process of this embodiment is retrieved and storage device carries out second grade high temperature heat recovery and storage in second grade high temperature phase transition recovery energy storage lifter plate 8, and what mainly retrieved and stored is the steel billet comes out from continuous casting device 1 the high temperature heat in the initial cooling process. In the multi-stage phase change recovery and storage device for heat in the continuous casting and billet cooling process of the embodiment, the third-stage medium-temperature heat energy recovery and storage is carried out in the three-stage medium-temperature phase change recovery storage wall 9, and the medium-temperature heat energy after the billet is cooled for a period of time is mainly recovered and stored.
The embodiment sequentially recovers and stores the heat energy of the first stage, the second stage and the third stage, the heat energy is fully recovered, and the utilization rate of energy is greatly improved; and the phase change energy storage material can be repeatedly used after heat energy is utilized.
Further, the outer surface of the phase change recovery energy storage cover 2 is wrapped with a heat insulation material in the high-temperature continuous casting process, and the heat insulation material is wrapped outside the three-level medium-temperature phase change recovery storage wall 9.
The control system 7 comprises a temperature detection device and a control device; the temperature detection device is used for detecting the temperature in the secondary high-temperature phase change recovery energy storage lifting plate 8, converting a measured temperature signal into an electric signal and transmitting the electric signal to the control device;
after the control device receives the electric signal of the temperature detection device, the control device can control the second-stage high-temperature phase change recovery energy storage lifting plate 8 to ascend and descend.
The top of the billet stacking cooling chamber is provided with a heat-insulating wall 6, and the heat-insulating wall 6 can move. Preferably, in order to prevent the heat from being lost and wasted through the heat-insulating wall 6, the heat-insulating wall 6 is made of heat-insulating materials.
When the crown block 5 lifts steel billets into the steel ingot stacking and cooling chamber, the top heat-insulating wall 6 is in an open state, and the secondary high-temperature phase change recovery energy storage lifting plate 8 is in a lifting state. The billet stack is put into the second grade high temperature phase transition recovery energy storage lifter plate 8 of constituteing by the energy storage lifter plate, treats that whole steel ingots are put into the back, closes top heat preservation wall 6 for second grade high temperature phase transition recovery energy storage lifter plate 8 is in complete encapsulated situation, carries out second grade heat recovery and stores in second grade high temperature phase transition recovery energy storage lifter plate 8 this moment. Eutectic aluminum-silicon alloy phase change energy storage materials are arranged in the secondary high-temperature phase change recovery energy storage lifting plate 8, and high-temperature heat can be continuously recovered and stored.
After a period of heat recovery, when the temperature in the second-stage high-temperature phase change recovery energy storage lifting plate 8 is lower than 577 ℃, the energy storage is not recovered in the second-stage high-temperature phase change recovery energy storage lifting plate 8, and the second-stage heat recovery and storage process is finished at the moment. When the second-stage heat recovery and storage process is finished, the actual temperature in the second-stage high-temperature phase change recovery energy storage lifting plate 8 can be detected by temperature detection, and signals are transmitted to the control device through the temperature sensor, so that the second-stage high-temperature phase change recovery energy storage lifting plate 8 descends, and then the steel ingot stack is placed in a space formed by the third-stage medium-temperature phase change recovery storage wall 9, and the third-stage medium-temperature heat recovery and storage are started. Because the aluminum-tin alloy is arranged in the three-stage medium-temperature phase change recovery storage wall 9 and is suitable for recovering and storing heat above 230 ℃, the third-stage medium-temperature heat recovery and storage can be better connected with the previous-stage heat recovery process, and the heat recovery and storage of the last stage are completed.
Similarly, elements such as Cu, Fe, Ni and Ti can be added into the aluminum-tin alloy so as to improve the stability of the medium-temperature phase change energy storage material system and enhance the oxidation resistance.
Because the stainless steel water pipes 12 are uniformly distributed in each stage of phase change energy storage heat recovery device, when the heat which is recovered and stored is required to be used outside, cooling water is introduced from the inlets 10 of the water pipes 12, and the stored heat can enable the cooling water in the water pipes 12 to be overheated into steam and flow out from the outlets 11 of the water pipes for power generation. Of course, it should be noted that in the whole heat recovery and storage process, before the phase change energy storage device reaches the energy storage limit, the stored heat should be transferred and utilized in time, so as to avoid waste of the recovered and stored heat.
The multi-stage phase change recovery and storage device for the heat in the continuous casting and billet cooling processes can fully recover, store and utilize the heat, simultaneously solves the problem of high workshop temperature caused by directly transferring the heat released in the continuous casting and billet stacking cooling processes to a workshop to a certain extent, and improves the workshop environment. On the other hand, the temperature of the steel billet stack is very high, the cooling speed in a workshop is very slow, and the production efficiency is low; the water cooling not only needs a large amount of water resources, but also causes brittle fracture of the steel billet due to the over-fast cooling. The device of the invention utilizes the heat released by the multi-stage recovery of the phase change energy storage material and the stack cooling of the steel billet, can relatively quickly improve the cooling rate of the steel billet without influencing the organization structure and the mechanical property of the steel billet, thereby improving the production efficiency.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A multi-level phase change recovery and storage device for heat in the continuous casting and billet cooling processes is characterized by comprising a phase change recovery energy storage cover, a billet conveying device, a billet stacking and cooling chamber and a control system in the high-temperature continuous casting process; the phase change recovery energy storage cover and the billet stacking cooling chamber are packaged with phase change energy storage materials with different phase change temperatures in the high-temperature continuous casting process;
the phase change recovery energy storage cover covers the continuous casting device in the high-temperature continuous casting process and is used for recovering and storing heat energy in the continuous casting process;
the billet steel conveying device is arranged behind the continuous casting device and is used for conveying continuously cast billet steel to the billet steel stacking and cooling chamber;
the billet stack cooling chamber is used for recovering and storing heat energy in the billet cooling process.
2. The apparatus of claim 1, wherein the billet stack cooling chamber has an inner and outer double-layer structure, the inner layer is a two-stage high-temperature phase change recovery energy storage lifting plate, and the outer layer is a three-stage medium-temperature phase change recovery storage wall.
3. The apparatus of claim 1, wherein the high temperature continuous casting process phase change recovery energy storage enclosure comprises a housing, a high temperature phase change energy storage material, and a water pipe;
the high-temperature phase change energy storage material is packaged in the shell; the water pipe is coiled in a zigzag manner and is inserted into the phase change energy storage material;
the high-temperature phase change energy storage material is aluminum-silicon alloy, and the phase change temperature is 577-800 ℃.
4. The device of claim 2, wherein the secondary high temperature phase change recovery energy storage lifter plate comprises a housing, a high temperature phase change energy storage material, a water pipe;
the high-temperature phase change energy storage material is packaged in the shell; the water pipe is coiled in a zigzag manner and is inserted into the high-temperature phase change energy storage material;
the high-temperature phase change energy storage material is aluminum-silicon alloy, and the phase change temperature is 577-800 ℃;
the three-stage medium-temperature phase change recovery energy storage wall comprises a shell, a medium-temperature phase change energy storage material and a water pipe;
the medium-temperature phase-change energy storage material is packaged in the shell; the water pipe is coiled in a zigzag manner and is inserted into the medium-temperature phase-change energy storage material;
the medium-temperature phase-change energy storage material is aluminum-tin alloy, and the phase-change temperature of the medium-temperature phase-change energy storage material is 230 ℃.
5. The apparatus of claim 1, wherein a heat-insulating wall is provided on the top of the billet stack cooling chamber, and the heat-insulating wall is movable;
the shell of the second-stage high-temperature phase change recovery energy storage lifting plate is of a uncovered cuboid structure, a hollow area is formed in the middle after the high-temperature phase change energy storage material is packaged in the shell, and the hollow area is used for placing steel billets.
6. The apparatus of claim 1, wherein the billet transportation means comprises a billet transportation box and a crown block; the overhead travelling crane is used for hoisting the steel billet transport box filled with the steel billets to the billet stacking and cooling chamber.
7. The apparatus of claim 2,
a flame cutter is arranged above the tail end of the phase change recovery energy storage cover in the high-temperature continuous casting process, and is used for cutting a steel billet;
and a flame cutting track groove with the width of 10mm is formed in the upper surface of the tail end of the phase change recovery energy storage cover in the high-temperature continuous casting process, and the flame cutting track groove is used for finishing cutting of continuous casting metal by a flame cutter.
8. The device of claim 2, wherein the outer surface of the phase change recovery energy storage cover in the high-temperature continuous casting process is wrapped with a thermal insulation material, and the outer surface of the three-stage medium-temperature phase change recovery storage wall is wrapped with a thermal insulation material.
9. The apparatus of claim 2, wherein the control system comprises a temperature sensing device and a control device; the temperature detection device is used for detecting the temperature in the secondary high-temperature phase change recovery energy storage lifting plate, converting a measured temperature signal into an electric signal and transmitting the electric signal to the control device;
and after the control device receives the electric signal of the temperature detection device, the control device controls the second-stage high-temperature phase change recovery energy storage lifting plate to ascend and descend.
10. The apparatus of claim 7, wherein the heat recovered and stored by the apparatus is used for heating the cooling water in the water pipes in the phase change recovery energy storage cover, the secondary high temperature phase change recovery energy storage lifting plate and the tertiary intermediate temperature phase change recovery energy storage wall in the high temperature continuous casting process into superheated steam, and the superheated steam is used for steam power generation.
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| CN116499292A (en) * | 2023-04-27 | 2023-07-28 | 西安交通大学 | Thermal management system suitable for high-temperature cavity and working method |
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