CN115371476B - An ultra-high temperature phase change heat storage system and a stable heat release method - Google Patents
An ultra-high temperature phase change heat storage system and a stable heat release method Download PDFInfo
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- CN115371476B CN115371476B CN202211022434.2A CN202211022434A CN115371476B CN 115371476 B CN115371476 B CN 115371476B CN 202211022434 A CN202211022434 A CN 202211022434A CN 115371476 B CN115371476 B CN 115371476B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 143
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008859 change Effects 0.000 title claims description 60
- 239000002775 capsule Substances 0.000 claims abstract description 60
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 238000005485 electric heating Methods 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000011232 storage material Substances 0.000 claims description 12
- 239000003566 sealing material Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 description 9
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- 238000003860 storage Methods 0.000 description 6
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- 229910052786 argon Inorganic materials 0.000 description 2
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- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus
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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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- Thermal Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Central Heating Systems (AREA)
Abstract
The invention relates to the technical field of heat storage, in particular to an ultra-high temperature phase-change heat storage system and a stable heat release method, wherein the ultra-high temperature phase-change heat storage system comprises an electric heating device and a heat storage device, wherein a multi-layer cup-shaped phase-change heat storage capsule is filled in the heat storage device; the adjacent cup-shaped phase-change heat storage capsule layers are contacted with each other through the bottom surface of the cup body and the top surface of the cup cover to form a contact plane, the electric heating device is paved on the contact plane, and gaps exist between the adjacent cup-shaped phase-change heat storage capsules in the radial direction. The electric heating phase-change heat storage capsule is electrically heated to an ultra-high temperature state, so that electric energy is converted into high phase-change latent heat and high temperature sensible heat, high heat storage density and low cost are realized, the cup-shaped phase-change capsule is closely arranged to obtain a good electric heating surface and a heat exchange fluid channel, the output temperature of the heat storage system is stable and adjustable in a split-flow heat release mode, and decoupling control of the output temperature and output heat power is realized.
Description
Technical Field
The disclosure relates to the technical field of heat storage, in particular to an ultrahigh temperature phase change heat storage system and a stable heat release method.
Background
The energy storage technology can effectively solve the problem of time mismatch between the supply side and the demand side of the energy system, is favorable for establishing an efficient and low-carbon energy structure, meets the overall goal of 2060 carbon neutralization, and has wide and far-reaching social and economic benefits. With the rapid emergence of new energy power stations such as photovoltaic power stations and wind power stations in recent years, a large amount of intermittent and unstable clean electric energy is difficult to be utilized by a user side. For the consumer side energy forms such as residents and industry, more than 90% of primary energy is consumed in the form of heat energy, so that the heat storage has a large market demand space. The development of efficient, low-cost, modularized and reliable heat storage technology is hopeful to solve the problem of the prior new energy sources such as photovoltaic, wind power and the like.
According to the heat storage principle, heat storage is divided into sensible heat, phase change and thermochemical heat storage. The sensible heat and the phase change heat storage are realized based on a thermophysical process (heat capacity of temperature change and latent heat of phase change), and the technical threshold is relatively low, so that the method is a hot spot of current application research. When the sensible heat stored in the packed bed is large (the change of the heat storage cycle temperature is large), since the heat absorption/release is realized by the rise/fall of the temperature of the storage medium, which causes the corresponding rise or fall of the output temperature, the system cannot realize the heat output of stable temperature, and thus cannot form an efficient heat absorption/release heat storage cycle. Since this problem is caused by the inherent nature of sensible heat storage, students generally consider it as a disadvantage of sensible heat storage, and no effective improvement method has been proposed. Team STEINFELD of the Federation institute of technology, zuishi, tried to add a phase change heat storage or thermochemical heat storage module at the outlet end to stabilize and improve the output temperature. However, the improvement effect of phase-change heat storage is limited, the output temperature is regulated to be limited (the output temperature can only be stabilized near the melting point of the phase-change material), the technology of thermochemical heat storage is complex, and the thermochemical heat storage is still in the research and development stage of a laboratory at present and is far away from engineering application.
Therefore, no system or device capable of effectively storing photovoltaic power, wind power and valley power is available at present to effectively store the clean energy.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The purpose of the present disclosure is to provide an ultra-high temperature phase change heat storage system and a stable heat release method, so as to overcome the situations of photovoltaic, wind power, valley electricity and the like caused by the limitations and defects of the related art at least to a certain extent.
Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the practice of the disclosure.
According to a first aspect of the present disclosure, there is provided an ultra-high temperature phase change heat storage system comprising:
the electric heating device and the heat storage device are filled with a plurality of layers of cup-shaped phase-change heat storage capsules;
The cup-shaped phase-change heat storage capsule comprises a cup body, a cup cover, a phase-change heat storage material, an electric heating device, a heat storage device and a heat storage device, wherein the cup cover is fastened at the top opening end of the cup body, and sealing materials are filled between the cup body and the cup cover;
The adjacent cup-shaped phase-change heat storage capsule layers are contacted with each other through the bottom surface of the cup body and the top surface of the cup cover to form a contact plane, the electric heating device is paved on the contact plane and is used for heating the cup-shaped phase-change heat storage capsules, gaps exist between the adjacent cup-shaped phase-change heat storage capsules in the radial direction, and the gaps provide flow and heat exchange channels for heat exchange fluid during heat release;
An exothermal control device comprising a diverter and a mixing structure;
The inlet end of the diverter is a total flow, the first outlet end of the diverter is communicated with the heat storage device through a pipeline, the second outlet of the diverter is communicated with the mixing structure, the outlet of the heat storage device is communicated with the mixing structure through a pipeline, and the outlet of the mixing structure is the total flow.
Optionally, the outer diameter of the cup cover is larger than the outer diameter of the cup body, the cup covers of each layer of adjacent cup-shaped phase-change heat storage capsules are arranged in parallel in a lamination mode, and gaps exist between the cup bodies of the two adjacent cup-shaped phase-change heat storage capsules.
Optionally, the electric heating device is an electric heating pad, and the electric heating pad is laid on a contact plane between each layer of the cup-shaped phase-change heat storage capsule.
Alternatively, the cup-shaped phase change heat storage capsules are arranged in a packed bed form.
Optionally, a rotatable baffle plate is disposed inside the diverter, and the baffle plate can be rotated to change the flow rate of the first outlet and the flow rate of the second outlet, so as to change the flow rate of the fluid entering the heat storage device, and further adjust the temperature of the fluid output by the outlet of the mixer.
According to a second aspect of the present disclosure, there is provided a stable exothermic method of an ultra-high temperature phase change heat storage system, comprising:
Adopts a split-flow heat release mode;
the total flow is divided into two flows through the flow divider, one flow enters the heat storage device for heating, and the other flow is not heated and is fully mixed with the heated flow in the mixing structure, so that the required heat release temperature is obtained.
And the heat exchange fluid temperature after being mixed by the mixing structure is controlled by adjusting the angle of the baffle plate of the flow divider to change the flow ratio of the heat exchange fluid entering the heat storage device, so that heat is supplied to the heat utilization end.
Optionally, the fluid temperature after being mixed by the mixing structure is used as an objective function, the required angle of the baffle plate is calculated based on a PID algorithm, and the flow entering the heat storage device is regulated, so that the objective function reaches the heat utilization temperature of the heat utilization end.
The ultra-high temperature phase change heat storage system comprises an electric heating device and a heat storage device, wherein a plurality of layers of cup-shaped phase change heat storage capsules are filled in the heat storage device, the cup-shaped phase change heat storage capsules comprise cup bodies, cup covers are buckled at top opening ends of the cup bodies, sealing materials are filled between the cup bodies and the cup covers, the phase change heat storage materials are located in the cup bodies and used for storing heat energy, the electric heating device is arranged at the bottoms of the cup bodies and the tops of the cup covers and used for heating the phase change heat storage materials in the cup bodies, contact planes are formed between adjacent cup-shaped phase change heat storage capsule layers through the bottom surfaces of the cup bodies and the top surfaces of the cup covers, the electric heating device is paved on the contact planes and used for heating the cup-shaped phase change heat storage capsules, gaps exist between the adjacent cup-shaped phase change heat storage capsules in the radial direction, heat exchange fluid provides flow and a heat exchange channel when the gaps are heat release, the heat release control device comprises a diverter and a mixing structure, the inlet end of the diverter is a total flow strand, the first outlet end of the diverter is communicated with the outlet of the diverter through a pipeline, and the mixing structure is communicated with the outlet of the mixing structure. The phase-change heat storage capsule is electrically heated to an ultra-high temperature state, so that electric energy is converted into high phase-change latent heat and large temperature change sensible heat, high heat storage density and low cost are realized, a good electric heating surface and a heat exchange fluid channel are obtained through the compact arrangement of the cup-shaped phase-change capsules, the output temperature of the heat storage system is stable and adjustable in a split-flow heat release mode, decoupling control of the output temperature and output heat power is realized, and the problem of large-scale absorption of photovoltaic, wind power, valley power and the like can be solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic diagram of an ultra-high temperature phase change heat storage system according to the present exemplary embodiment.
Fig. 2 is a schematic structural view of the adjustable shunt provided in the present exemplary embodiment.
FIG. 3 is a comparison of (a) a general exothermic process with (b) a stable exothermic process according to the present invention.
Fig. 4 is a diagram showing the filling effect of the cup-shaped phase-change capsule provided in the present exemplary embodiment.
Fig. 5 is a schematic structural view of a cup-shaped phase change capsule provided in the present exemplary embodiment.
In the figure, 1, total flow, 2, a flow divider, 3, flow entering the heat storage device, 4, flow not entering the heat storage device, 5, a mixing structure, 6, a baffle plate, 7, a gap, 8, an electric heating pad, 9, a phase change heat storage material, 10, a heat storage device, 11, a cup cover, 12, a cup body, 13 and a sealing material.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software or in one or more hardware modules or integrated circuits or in different networks and/or processor devices and/or microcontroller devices.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The invention aims to solve the problems of photovoltaic, wind power, valley electricity and the like, and provides an ultrahigh temperature phase change heat storage system and a stable heat release method.
According to a first aspect of the present disclosure, there is provided an ultra-high temperature phase change heat storage system, comprising an electric heating device and a heat storage device, wherein a plurality of layers of cup-shaped phase change heat storage capsules are filled in the heat storage device, the cup-shaped phase change heat storage capsules comprise cup bodies, cup covers are buckled at top opening ends of the cup bodies, sealing materials are filled between the cup bodies and the cup covers, the phase change heat storage materials are located in the cup bodies and used for storing heat energy, the electric heating device heats the phase change heat storage materials in the cup bodies at the bottoms of the cup bodies and the tops of the cup covers, contact planes are formed between adjacent cup-shaped phase change heat storage capsule layers through the bottoms of the cup bodies and the top surfaces of the cup covers, the electric heating device is paved on the contact planes and used for heating the cup-shaped phase change heat storage capsules, gaps exist between adjacent cup-shaped phase change heat storage capsules in the radial direction, the gaps provide flowing and heat exchange channels for heat exchange fluid when the gaps are exothermic, the exothermic control device comprises a diverter and a mixing structure, the inlet end of the diverter is total flow, the first outlet end of the diverter is communicated with the outlet of the diverter through a pipeline, the first outlet end of the diverter is communicated with the outlet of the diverter through the mixing structure, and the outlet of the diverter is communicated with the outlet through the mixing structure.
In the embodiment of the application, the ultra-high temperature phase-change heat storage system and the stable heat release method are provided, the high temperature phase-change capsules are heated to more than 1000 ℃ through low-price electricity such as wind electricity, photovoltaic electricity and valley electricity, the phase-change capsules are arranged in a filling bed mode, the phase-change capsules are in a cup-shaped design, the protruding distance of the cup cover from the cup body is used as a gap 7 through which heat exchange fluid passes when releasing heat, the bottom and the top of the cup are planes, and the electric heating pad is convenient to conduct efficient surface heating. The heat exchange fluid adopts inert gas such as argon, so that the circulation stability and the service life of the high-temperature material are improved. The phase change capsule packed bed is not in direct contact with the thermal insulation layer of the thermal storage device 10 by adopting a bracket so as to reduce the thermal storage loss.
Compared with the existing large-scale energy storage technology, the invention has at least the following beneficial effects:
the cup-shaped phase-change capsule can utilize an electric heating pad (8) to heat the cup cover and the cup bottom plane, realize a rapid surface heating effect, form a heat exchange fluid channel with the cup cover and the cup body after the cup-shaped capsule is tightly arranged and filled, ensure the uniform and unified structure of the filled bed, facilitate the design optimization of heat release, realize stable and adjustable output temperature and realize decoupling control of the output temperature and the output heat power by a stable heat release method.
In the embodiment, the ultra-high temperature phase-change heat storage system comprises an electric heating device and a heat storage device, wherein multilayer cup-shaped phase-change heat storage capsules are filled in the heat storage device, the cup-shaped phase-change heat storage capsules comprise cup bodies, cup covers are buckled at top opening ends of the cup bodies, sealing materials are filled between the cup bodies and the cup covers, the phase-change heat storage materials are located in the cup bodies and used for storing heat energy, the electric heating device is arranged at the bottoms of the cup bodies and the tops of the cup covers and used for heating the phase-change heat storage materials in the cup bodies, contact planes are formed between adjacent cup-shaped phase-change heat storage capsule layers through the bottoms of the cup bodies and the top surfaces of the cup covers, the electric heating device is paved on the contact planes and used for heating the cup-shaped phase-change heat storage capsules, gaps exist in the radial direction for the adjacent cup-shaped phase-change heat storage capsules, heat exchange fluid provides flow and a heat exchange channel when the gaps are exothermic, the heat release control device comprises a diverter and a mixing structure, the inlet end of the diverter is a total flow, the diverter is communicated with the outlet of the heat storage structure, and the inlet end of the diverter is communicated with the outlet of the heat storage structure through the first diverter and the outlet of the mixing structure. The phase-change heat storage capsule is electrically heated to an ultra-high temperature state, so that electric energy is converted into high phase-change latent heat and large temperature change sensible heat, high heat storage density and low cost are realized, a good electric heating surface and a heat exchange fluid channel are obtained through the compact arrangement of the cup-shaped phase-change capsules, the output temperature of the heat storage system is stable and adjustable in a split-flow heat release mode, decoupling control of the output temperature and output heat power is realized, and the problem of large-scale absorption of photovoltaic, wind power, valley power and the like can be solved.
In a specific embodiment, the outer diameter of the cup cover is larger than the outer diameter of the cup body, the cup covers of the cup-shaped phase-change heat storage capsules adjacent to each layer are arranged in parallel in a lamination mode, and gaps exist between the cup bodies of the two cup-shaped phase-change heat storage capsules adjacent to each other.
In a specific embodiment, the electric heating means is an electric heating pad laid on a contact plane between each layer of the cup-shaped phase change heat storage capsule.
In one embodiment, a rotatable baffle is disposed within the diverter, and the temperature of the fluid output from the mixer outlet is adjusted by rotating the baffle to vary the flow rate of the first outlet and the flow rate of the second outlet to vary the flow rate of the fluid into the thermal storage device.
By the above arrangement, stable heat release can be achieved, specifically, by dividing the heat exchange fluid into two streams, one stream is heated or cooled in the heat storage device 10, and then the other stream is fully mixed and outputted. By adjusting the flow rate into the heat storage device 10, a reasonable proportioning of the two cold and hot fluids is achieved, so that the final output temperature is stabilized near the set temperature. The total flow of the heat exchange fluid is constant in the adjusting process, so that the output temperature is ensured to be stable under constant heat power. And, the output temperature is constant while the flow rate is regulated, thereby decoupling the power control and the output temperature control of the exothermic process of the heat storage device 10.
The application provides an ultra-high temperature phase change heat storage system, which is shown in the accompanying drawings 1-5, and comprises electric heating, cup-shaped phase change heat storage capsules and heat release control. The cup-shaped phase-change heat storage capsules are arranged in a packed bed mode, electric heating pads 8 are paved on the planes of the bottom and the top of each cup to heat the surfaces, a protruding gap 7 between each cup cover and each cup body is used as a heat exchange fluid channel during heat release, and during heat release, the heat exchange fluid is divided into two flows and one flow to enter the heat storage device 10 to exchange heat and then is fully mixed with the other flow to be output. The cup-shaped phase-change capsule consists of a cup cover, a cup body, a sealing material and a phase-change heat storage material 9. The two streams are split by an adjustable splitter 2, and the built-in rotatable baffle 6 can adjust the flow distribution of the stream 3 and the stream 4. Further, the rotatable baffle plate 6 is used as an actuator, the flow distribution of the flow 3 and the flow 4 can be changed by adjusting the rotation angle of the baffle plate 6, and after the mixed flow is mixed by the mixing structure 5, the mixed flow is used as a hot end for heating, so that the application can take the rotation angle of the baffle plate 6 as a control quantity and the output temperature of the mixing structure 5 as a controlled quantity, thereby realizing the stabilization and effective adjustment of the output temperature.
According to a second aspect of the present disclosure, there is provided a stable exothermic method of an ultra-high temperature phase change heat storage system, comprising steps S110 to S130.
S110, adopting a split-flow heat release mode;
S120, dividing the total flow into two flows through a flow divider, wherein one flow enters a heat storage device for heating, and the other flow is not heated and is fully mixed with the heated flow in a mixing structure, so that the required heat release temperature is obtained.
S130, changing the flow ratio of the heat exchange fluid entering the heat storage device by adjusting the angle of the baffle plate of the flow divider, controlling the temperature of the heat exchange fluid after being mixed by the mixing structure, and further supplying heat to the heat utilization end.
In one embodiment, the step of configuring the corresponding fluid distribution parameters based on the heat utilization temperature, the current temperature of the heat storage device 10, and the flow rate of the fluid includes calculating a desired angle of the baffle plate based on a PID algorithm with the fluid temperature mixed by the mixing structure as an objective function, and adjusting the flow rate entering the heat storage device so that the objective function reaches the heat utilization temperature of the heat utilization end.
According to the ultra-high temperature phase change heat storage system and the stable heat release method, when the system is charged, low-price electricity such as wind power, photovoltaic electricity and valley electricity is used for heating a high-temperature phase change capsule to more than 1000 ℃, the phase change capsule is tightly arranged in a heat storage device 10 in a filling bed mode, the phase change capsule adopts a cup-shaped design, the protruding distance of a cup cover from the cup body is used as a gap 7 through which heat exchange fluid passes when releasing heat, the bottom and the top of the cup are planes, an electric heating pad 8 is used for carrying out high-efficiency surface heating, and a phase change heat storage material 9 is filled in the cup.
When exothermic, referring to fig. 1, the total heat exchange fluid stream 1 is split into two streams by an adjustable splitter 2, stream 3 enters a heat storage device 10 to be heated or cooled, then thoroughly mixed with stream 4 in a mixing structure 5, and then output.
Specifically, the adjustable flow divider 2 can be seen in fig. 2, and the cross-sectional areas of the flow 3 and the flow 4 can be adjusted by the rotatable baffle 6, so that the flow adjustment of the two flows is realized under the condition that the total flow is constant.
Further, the baffle plate 6 is used as a control actuator, the rotation angle of the baffle plate is adjusted, the fluid temperature after being fully mixed from the mixing structure 5 is used as a controlled quantity, and the output temperature can be effectively controlled to be stabilized near a set value through a PID algorithm.
Taking a sensible heat release process of a high temperature packed bed as an example, the effect of the method on output temperature stabilization is demonstrated based on numerical simulation, please refer to fig. 3. In this case, the initial temperature of the bed is 1000 ℃, the heat exchange fluid inlet temperature is 60 ℃, and the dynamic profile of the output temperature is shown in fig. 3b for the set values of 100 and 200 ℃, respectively. It can be seen that the stable heat release method provided by the invention can effectively stabilize the output temperature of the packed bed heat storage device 10 near the set value, and the set value is flexible and adjustable.
The heat exchange fluid adopts inert gas such as argon, so that the circulation stability and the service life of the high-temperature material are improved. The phase change capsule packed bed is not in direct contact with the thermal insulation layer of the thermal storage device 10 by adopting a bracket so as to reduce the thermal storage loss.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
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| ES2480765B1 (en) * | 2012-12-27 | 2015-05-08 | Universitat Politècnica De Catalunya | Thermal energy storage system combining solid heat sensitive material and phase change material |
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| CN113375493B (en) * | 2021-06-29 | 2022-02-15 | 哈尔滨工业大学 | A new multi-stage plate type integrated phase change heat storage and heat exchange device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106705704A (en) * | 2016-12-30 | 2017-05-24 | 西安交通大学 | Efficient heat storage reactor based on metal hydride |
| CN106839850A (en) * | 2017-03-29 | 2017-06-13 | 中山大学 | A kind of modularization step heat-storing device and its method based on phase-change heat accumulation unit |
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