CN114674170A - Molten salt heat storage device and molten salt heat storage system - Google Patents
Molten salt heat storage device and molten salt heat storage system Download PDFInfo
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- CN114674170A CN114674170A CN202210369285.0A CN202210369285A CN114674170A CN 114674170 A CN114674170 A CN 114674170A CN 202210369285 A CN202210369285 A CN 202210369285A CN 114674170 A CN114674170 A CN 114674170A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 382
- 238000005338 heat storage Methods 0.000 title claims abstract description 54
- 230000009471 action Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
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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
- F28D2020/0004—Particular heat storage 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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- Mechanical Engineering (AREA)
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
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Abstract
The invention provides a molten salt heat storage device and a molten salt heat storage system. The molten salt heat storage device of the present invention includes: the molten salt storage tanks are provided with overflow ports and molten salt inlets located below the overflow ports, the molten salt storage tanks are distributed along the vertical direction, and the overflow port located at the upper part of two adjacent molten salt storage tanks is connected with the molten salt inlet located at the lower part of two adjacent molten salt storage tanks so as to be suitable for the molten salt in the molten salt storage tanks to overflow to the molten salt storage tank below the molten salt storage tanks; any two adjacent fused salt storage tanks are connected through the corresponding overflow pipes; the inlet of the circulating pipe is connected with the overflow port of the lowest one of the plurality of molten salt storage tanks, and the outlet of the circulating pipe is connected with the molten salt inlet of the highest one of the plurality of molten salt storage tanks; a heat exchanger; and the circulating pump is arranged on the circulating pipe or the overflow pipe. Therefore, the molten salt heat storage device has the advantages of convenience in expansion of the molten salt storage amount, convenience in setting and cost saving.
Description
Technical Field
The invention relates to the technical field of energy storage devices, in particular to a molten salt heat storage device and a molten salt heat storage system.
Background
The molten salt heat storage technology has the advantages of low price, safe and stable system, high working temperature, environmental protection and incombustibility. During heat storage, the temperature is raised by absorbing external heat, and during heat release, the temperature of an output medium is raised by heat exchange. In the correlation technique, the 'single-tank' fused salt heat storage technical scheme based on the fluid inclined temperature layer principle is used preliminarily, the scheme can greatly reduce the construction investment cost of the fused salt heat storage system, and the correlation system is simplified. However, since molten salts with different temperature parameters are mixed and stored in the same tank, higher requirements are put on the operation control of the system. In addition, the technical scheme of the 'single-tank' molten salt heat storage cannot simply expand the capacity.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention propose a molten salt heat storage device and a molten salt heat storage system.
The molten salt heat storage device of the embodiment of the invention comprises:
a plurality of molten salt storage tanks adapted to store molten salt, each of the molten salt storage tanks having an overflow port and a molten salt inlet below the overflow port, the plurality of molten salt storage tanks being arranged in an up-down direction, the overflow port of an upper one of two adjacent molten salt storage tanks being connected to the molten salt inlet of a lower one of two adjacent molten salt storage tanks so as to be adapted to allow molten salt in the molten salt storage tank to overflow to the molten salt storage tank below the overflow port;
any two adjacent fused salt storage tanks are connected through the corresponding overflow pipes, one ends of the overflow pipes are communicated with the corresponding overflow ports, and the other ends of the overflow pipes are communicated with the corresponding fused salt inlets;
an inlet of the circulation pipe is connected with the overflow port of the lowest one of the plurality of molten salt storage tanks, and an outlet of the circulation pipe is connected with the molten salt inlet of the highest one of the plurality of molten salt storage tanks;
the heat exchanger is arranged on the circulating pipe and is suitable for exchanging heat with the molten salt in the circulating pipe;
and the circulating pump is arranged on the circulating pipe or the overflow pipe and is suitable for driving the molten salt to circularly flow.
Therefore, the molten salt heat storage device has the advantages of convenience in expansion of molten salt storage capacity, convenience in setting and cost saving.
In some embodiments, the circulation pump is provided to the circulation pipe, and the circulation pump is located between the heat exchanger and the lowermost molten salt tank.
In some embodiments, the top of the molten salt storage tanks is open, the overflow outlet of each molten salt storage tank is located near an upper edge of the molten salt storage tank, and the molten salt outlet of each molten salt storage tank is located near a lower edge of the molten salt storage tank.
In some embodiments, each molten salt tank comprises a plurality of said overflow outlets and a plurality of said molten salt inlets, the plurality of said overflow outlets being spaced circumferentially of the molten salt tank, the plurality of said molten salt inlets being spaced circumferentially of the molten salt tank.
The molten salt heat storage device comprises a flow divider, wherein the flow divider is arranged at the bottom in the molten salt storage tank, the flow divider is provided with a flow dividing cavity and a plurality of flow dividing holes communicated with the flow dividing cavity, the flow dividing holes are formed in the top of the flow divider, and the inlet of the flow divider forms the molten salt inlet of the molten salt storage tank.
In some embodiments, the flow splitter comprises a plurality of first flow splitting pipes and a plurality of second flow splitting pipes, each of the plurality of first flow splitting pipes and the plurality of second flow splitting pipes is provided with the flow splitting hole, the plurality of first flow splitting pipes are arranged in parallel at intervals along a length direction of the molten salt storage tank, the plurality of second flow splitting pipes are arranged in parallel at intervals along a width direction of the molten salt storage tank, and each of the first flow splitting pipes is communicated with the plurality of second flow splitting pipes.
In some embodiments, an end of at least part of the first shunt pipe extends to the outside of the molten salt tank and forms the molten salt inlet, and an end of at least part of the second shunt pipe extends to the outside of the molten salt tank and forms the molten salt inlet.
In some embodiments, the overflow pipes include a plurality of first overflow pipes and a plurality of second overflow pipes, the plurality of first overflow pipes are disposed at one side of the plurality of molten salt storage tanks, the plurality of second overflow pipes are disposed at the other side of the plurality of molten salt storage tanks, and the plurality of first overflow pipes and the plurality of second overflow pipes are alternately arranged one by one along a flowing direction of the molten salt.
In some embodiments, the inlet of the circulation pipe is detachably connected to the overflow port of the corresponding molten salt storage tank, and the outlet of the circulation pipe is detachably connected to the molten salt inlet of the corresponding molten salt storage tank.
The invention also provides a molten salt heat storage system which comprises the molten salt heat storage device.
Drawings
Fig. 1 is a schematic view of a molten salt heat storage device according to an embodiment of the invention.
FIG. 2 is a schematic view of a molten salt tank according to an embodiment of the invention.
FIG. 3 is a partial enlarged view of a molten salt tank according to an embodiment of the invention.
Reference numerals:
a molten salt heat storage device 100;
a molten salt storage tank 1, a first molten salt storage tank 101, a second molten salt storage tank 102, a third molten salt storage tank 103, a fourth molten salt storage tank 104, an overflow 11, a molten salt inlet 12, a bottom plate 13, a first side plate 14, a second side plate 15, a third side plate 16, a fourth side plate 17;
circulation pipe 3, inlet 31 of circulation pipe 3, outlet 32 of circulation pipe 3;
a heat exchanger 4;
a circulation pump 5;
the flow divider 6, a first flow dividing pipe 61, a second flow dividing pipe 62 and a flow dividing hole 63.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A molten salt heat storage device 100 of an embodiment of the present invention is described below with reference to the drawings. As shown in fig. 1 to 3, a molten salt heat storage device 100 according to an embodiment of the present invention includes a plurality of molten salt tanks 1, a plurality of overflow pipes 2, a circulation pipe 3, a heat exchanger 4, and a circulation pump 5.
The molten salt tanks 1 are adapted to store molten salt, each molten salt tank 1 having an overflow 11 and a molten salt inlet 12 located below the overflow 11. The plurality of molten salt storage tanks 1 are arranged along the up-down direction, and the overflow port 11 of one of the two adjacent molten salt storage tanks 1 located above is connected with the molten salt inlet 12 of one of the two adjacent molten salt storage tanks 1 located below, so that the molten salt in the molten salt storage tanks 1 can overflow to the molten salt storage tank 1 below. Any two adjacent fused salt storage tanks 1 are connected through corresponding overflow pipes 2, one ends of the overflow pipes 2 are communicated with corresponding overflow ports 11, and the other ends of the overflow pipes are communicated with corresponding fused salt inlets 12.
The inlet 31 of the circulation pipe 3 is connected to the overflow port 11 of the lowermost one of the plurality of molten salt storage tanks 1, and the outlet 32 of the circulation pipe 3 is connected to the molten salt inlet 12 of the uppermost one of the plurality of molten salt storage tanks 1. The heat exchanger 4 is provided on the circulation pipe 3 to be adapted to exchange heat with the molten salt inside the circulation pipe 3. The circulating pump 5 is arranged on the circulating pipe 3 or the overflow pipe 2, and the circulating pump 5 is suitable for driving the molten salt to circularly flow.
According to the molten salt heat storage device 100 provided by the embodiment of the invention, the plurality of molten salt storage tanks 1 suitable for storing molten salt are arranged, so that the molten salt storage amount of the molten salt heat storage device 100 can be increased, and the heat storage capacity of the molten salt heat storage device 100 can be further increased. And the plurality of molten salt storage tanks 1 are arranged along the up-down direction, the overflow port 11 of one of the two adjacent molten salt storage tanks 1 positioned above is connected with the molten salt inlet 12 of one of the two adjacent molten salt storage tanks 1 positioned below, so that the molten salt in the molten salt storage tanks 1 can overflow to the molten salt storage tank 1 below. Thus, after the circulating pump 5 drives the molten salt to circulate and flow and exchange heat with the heat exchanger 4, the molten salt enters the uppermost one of the plurality of molten salt storage tanks 1 through the outlet 32 of the circulating pipe 3 and exchanges heat with the molten salt in the uppermost molten salt storage tank 1. As the molten salt in the uppermost molten salt storage tank 1 gradually increases, the overflow port 11 of the uppermost molten salt storage tank 1 will overflow a part of the molten salt and flow into the molten salt storage tank 1 adjacent to the uppermost molten salt storage tank 1 through the overflow pipe 2 under the action of gravity and exchange heat with the molten salt in the molten salt storage tank 1. In the continuous operation of the circulating pump 5, after the molten salt in the upper one of the two adjacent molten salt storage tanks 1 is gradually increased, a part of the molten salt can overflow through the overflow port 11 of the upper one of the two adjacent molten salt storage tanks 1 to the lower one of the two adjacent molten salt storage tanks 1 and exchange heat with the molten salt in the lower one of the two adjacent molten salt storage tanks 1. That is, the plurality of molten salt storage tanks 1 arranged in the up-down direction can transfer the molten salt in one of the two adjacent molten salt storage tanks 1 located above to one of the two adjacent molten salt storage tanks 1 located below through the overflow port 11 and perform heat exchange. Thereby make and carry the fused salt between the fused salt storage tank 1 that a plurality of directions were arranged from top to bottom comparatively convenient and energy saving, and then make fused salt heat-retaining device 100 can enlarge the basis of fused salt memory space and set up the condition simply, practice thrift manufacturing cost.
Therefore, the molten salt heat storage device 100 according to the embodiment of the invention has the advantages of convenience in enlarging the molten salt storage amount, convenience in setting and cost saving.
As shown in fig. 1 to 3, a molten salt heat storage device 100 according to an embodiment of the present invention includes a plurality of molten salt tanks 1, a plurality of overflow pipes 2, a circulation pipe 3, a heat exchanger 4, and a circulation pump 5.
The plurality of molten salt storage tanks 1 are arranged in the up-down direction, the molten salt storage tanks 1 are suitable for storing molten salt, and the number of the molten salt storage tanks 1 is at least 2, so that the molten salt storage amount of the molten salt heat storage device 100 is increased. Each molten salt storage tank 1 has an overflow port 11 and a molten salt inlet 12 located below the overflow port 11, and the top of the molten salt storage tank 1 is open, thereby making the air pressure inside the molten salt storage tank 1 consistent with the outside, and facilitating the molten salt inside the molten salt storage tank 1 to overflow from the overflow port 11 to the outside. The up-down direction is shown by the arrows in fig. 1 and 2. For example, each of the plurality of molten salt tanks 1 includes a bottom plate 13 and first, second, third and fourth side plates 14, 15, 16, 17 connected to the bottom plate 13, the first and third side plates 14, 16 being disposed opposite each other, and the second and fourth side plates 15, 17 being disposed opposite each other.
As shown in fig. 2, in some embodiments, the overflow 11 of each molten salt tank 1 is provided near the upper edge of the molten salt tank 1, and the molten salt outlet of each molten salt tank 1 is provided near the lower edge of the molten salt tank 1. Thereby, each molten salt storage tank 1 can store more molten salt, and the molten salt storage amount of the molten salt heat storage device 100 is increased.
The overflow port 11 of the upper one of the two adjacent molten salt storage tanks 1 is connected to the molten salt inlet port 12 of the lower one of the two adjacent molten salt storage tanks 1 so as to be adapted to allow the molten salt in the molten salt storage tank 1 to overflow to the molten salt storage tank 1 therebelow. Any two adjacent fused salt storage tanks 1 are connected through corresponding overflow pipes 2, one ends of the overflow pipes 2 are communicated with corresponding overflow ports 11, and the other ends of the overflow pipes are communicated with corresponding fused salt inlets 12. Specifically, one end (upper end) of the overflow pipe 2 is connected to the overflow port 11 of one of the two adjacent molten salt storage tanks 1 located above, and the other end (lower end) of the overflow pipe 2 is connected to the molten salt inlet 12 of one of the two adjacent molten salt storage tanks 1 located below. Therefore, after the molten salt is continuously injected into the upper one of the two adjacent molten salt storage tanks 1, the upper one of the two adjacent molten salt storage tanks 1 can overflow a part of the molten salt into the lower one of the two adjacent molten salt storage tanks 1 through the overflow port 11 on the upper one of the two adjacent molten salt storage tanks 1 through the overflow pipe 2.
The inlet 31 of the circulation pipe 3 is connected to the overflow port 11 of the lowermost one of the plurality of molten salt storage tanks 1, and the outlet 32 of the circulation pipe 3 is connected to the molten salt inlet 12 of the uppermost one of the plurality of molten salt storage tanks 1. The heat exchanger 4 is provided on the circulation pipe 3 to be adapted to exchange heat with the molten salt inside the circulation pipe 3. The circulating pump 5 is arranged on the circulating pipe 3 or the overflow pipe 2, and the circulating pump 5 is suitable for driving the molten salt to circularly flow. Therefore, the molten salt in the lowest one of the molten salt storage tanks 1 enters the circulating pipe 3 under the action of the circulating pump 5, exchanges heat with the heat exchanger, and then is conveyed to the uppermost molten salt storage tank 1 for heat exchange.
In some embodiments, a circulation pump 5 is provided at the circulation pipe 3, and the circulation pump 5 is located between the heat exchanger 4 and the lowermost molten salt storage tank 1. Thereby be convenient for carry the fused salt that is located one of the below in a plurality of fused salt storage tanks 1 fast to the circulating pipe 3 in with heat exchanger 4 carry out the heat transfer, and then improve heat exchange efficiency.
As shown in fig. 1 and 2, in some embodiments, each molten salt tank 1 comprises a plurality of overflow ports 11 and a plurality of molten salt inlet ports 12, the plurality of overflow ports 11 being arranged at intervals along the circumference of the molten salt tank 1, the plurality of molten salt inlet ports 12 being arranged at intervals along the circumference of the molten salt tank 1. The overflow ports 11 and the molten salt inlets 12 facilitate that the positions and the number of the overflow pipes 2 can be set between two adjacent molten salt storage tanks 1 according to actual conditions. Specifically, the overflow pipe 2 is connected with the overflow port 11 and the molten salt inlet 12 on the same side of the two adjacent molten salt storage tanks 1, so that the installation of the overflow pipe 2 can be facilitated. When it is necessary to increase the flow rate of the molten salt between the adjacent two molten salt storage tanks 1, the number of overflow pipes between the adjacent two molten salt storage tanks 1 can be increased. For example, each molten salt storage tank 1 has 4 overflow ports 11 and molten salt inlets 12, each of the first side plate 14, the second side plate 15, the third side plate 16 and the fourth side plate 17 is provided with one overflow port 11 and one molten salt inlet 12, and two overflow pipes 2 are provided between two adjacent molten salt storage tanks 1 so as to increase the overflow speed.
As shown in fig. 1, in some embodiments, the plurality of overflow pipes 2 includes a plurality of first overflow pipes 21 and a plurality of second overflow pipes 22, the plurality of first overflow pipes 21 are provided at one side of the plurality of molten salt storage tanks 1, the plurality of second overflow pipes 22 are provided at the other side of the plurality of molten salt storage tanks 1, and the plurality of first overflow pipes 21 and the plurality of second overflow pipes 22 are alternately arranged one by one along the flow direction of the molten salt. That is, the plurality of overflow pipes 2 are alternately disposed at the side of the molten salt storage tank 1 in the flowing direction of the molten salt, so that the overflow pipes 2 do not affect each other. For example, in the flow direction of the molten salt, a first overflow pipe 2 (first overflow pipe 21) may be provided at the right side of the molten salt tank 1, a second overflow pipe 2 (second overflow pipe 22) may be provided at the left side of the molten salt tank 1, and a third overflow pipe 2 (first overflow pipe 21) may be provided at the right side or front and rear sides of the molten salt tank 1. The left-right direction and the front-back direction are shown by arrows in fig. 1 and 2.
In some embodiments, the inlet 31 of the circulation pipe 3 is detachably connected to the overflow port 11 of the corresponding molten salt storage tank 1, and the outlet 32 of the circulation pipe 3 is detachably connected to the molten salt inlet 12 of the corresponding molten salt storage tank 1. Therefore, when the molten salt storage capacity of the molten salt heat storage device 100 needs to be expanded, the molten salt storage tanks 1 are added above and below the plurality of original molten salt storage tanks 1, and then the inlet 31 of the circulation pipe 3 is connected to the overflow port 11 located at the lowermost one of the plurality of added molten salt storage tanks 1, and the outlet 32 of the circulation pipe 3 is connected to the molten salt inlet 12 located at the uppermost one of the plurality of added molten salt storage tanks 1. . Specifically, when a molten salt storage tank 1 is newly added above the existing plurality of molten salt storage tanks 1, the outlet 32 of the circulation pipe 3 is connected to the molten salt storage tank 1 located uppermost after the addition, and when a molten salt storage tank 1 is newly added below the existing plurality of molten salt storage tanks 1, the inlet 31 of the circulation pipe 3 is connected to the molten salt storage tank 1 located lowermost after the addition.
As shown in fig. 2 and 3, the molten salt heat storage device 100 according to the embodiment of the invention includes a flow divider 6, the flow divider 6 is provided at the bottom inside the molten salt storage tank 1, the flow divider 6 has a flow dividing cavity and a plurality of flow dividing holes 63 communicating with the flow dividing cavity, the flow dividing holes 63 open at the top of the flow divider 6, and the inlet of the flow divider 6 constitutes the molten salt inlet 12 of the molten salt storage tank 1. From this, can make the entering fused salt at first get into the reposition of redundant personnel intracavity of shunt 6, then through a plurality of splitter 63 and the fused salt heat transfer in fused salt storage tank 1 of reposition of redundant personnel chamber intercommunication, a plurality of splitter 63 with reposition of redundant personnel chamber intercommunication can make the fused salt heat transfer more even to improve heat exchange efficiency.
In some embodiments, the flow divider 6 comprises a plurality of first flow dividing pipes 61 and a plurality of second flow dividing pipes 62, each of the plurality of first flow dividing pipes 61 and the plurality of second flow dividing pipes 62 being provided with a flow dividing hole 63. The plurality of first shunt tubes 61 are arranged in parallel at intervals along the length direction of the molten salt storage tank 1, the plurality of second shunt tubes 62 are arranged in parallel at intervals along the width direction of the molten salt storage tank 1, and each first shunt tube 61 is communicated with the plurality of second shunt tubes 62. Thereby, the molten salt can be uniformly heat-exchanged with the molten salt in the molten salt tank 1 through the diversion holes 63 at the tops of the plurality of first diversion pipes 61 and the plurality of second diversion pipes 62.
In some embodiments, at least part of the end of the first shunt tube 61 extends outside the molten salt tank 1 and forms the molten salt inlet 12, and at least part of the end of the second shunt tube 62 extends outside the molten salt tank 1 and forms the molten salt inlet 12. Thereby facilitating the molten salt to enter the flow divider 6 (the first and second flow dividing pipes 61 and 62). For example, a plurality of first shunt tubes 61 and a plurality of second shunt tubes 62 are provided on the bottom plate 13, the plurality of first shunt tubes 61 are arranged in parallel at intervals in the left-right direction, the plurality of second shunt tubes 62 are arranged in parallel at intervals in the front-rear direction, both end portions of one first shunt tube 61 located in the middle extend to the outside of the molten salt tank 1 (the second side plate 15 and the fourth side plate 17) and form the molten salt inlet 12, and both end portions of one second shunt tube 62 located in the middle extend to the outside of the molten salt tank 1 (the first side plate 14 and the third side plate 16) and form the molten salt inlet 12.
As shown in fig. 1, in a particular embodiment, the plurality of molten salt storage tanks 1 comprises a first molten salt storage tank 101, a second molten salt storage tank 102, a third molten salt storage tank 103, and a fourth molten salt storage tank 104, which are arranged in sequence from bottom to top. The inlet 31 of the circulation pipe 3 is connected to the overflow 11 of the first molten salt tank 101 and the outlet 32 of the circulation pipe 3 is connected to the molten salt inlet 12 of the fourth molten salt tank 104. Therefore, the molten salt in the first molten salt storage tank 101 enters the circulating pipe 3 under the action of the circulating pump 5, exchanges heat with the heat exchanger and then is conveyed to the fourth molten salt storage tank 104 for heat exchange.
During heat storage, low-temperature molten salt flows out from the overflow interface 8 of the first molten salt storage tank 101, and the molten salt in the circulating pipe 3 and the heat exchanger 4 can absorb heat and raise the temperature under the action of the circulating pump 5. Then, the high-temperature molten salt is introduced into the molten salt inlet 12 of the fourth molten salt storage tank 104 through the circulation pipe 3, and after entering the splitter 6 of the fourth molten salt storage tank 104, the high-temperature molten salt uniformly flows out through the splitter holes 63, so that temperature stratification from bottom to top and from high to low is formed in the fourth molten salt storage tank 104, and the high-temperature region gradually moves upwards. After the high-temperature molten salt flows out from the overflow interface 8 on the fourth molten salt storage tank 104, the high-temperature molten salt flows into the molten salt inlet 12 of the third molten salt storage tank 103 through the overflow pipe 2 under the action of gravity, and undergoes the heat exchange and flow processes in the fourth molten salt storage tank 104 again. And finishing the heat storage process until all the molten salt temperatures in the first molten salt storage tanks 101 of the plurality of molten salt storage tanks 1 reach the standard.
When heat is released, high-temperature molten salt flows out from the overflow port 11 of the first molten salt storage tank 101, and the molten salt in the circulating pipe 3 and the heat exchanger 4 can release heat and cool under the action of the circulating pump 5. Then, the low-temperature molten salt is introduced into the molten salt inlet 12 of the fourth molten salt storage tank 104 through the circulating pipe 3, the low-temperature molten salt uniformly flows out through the diversion holes 63 after entering the diverter 6 of the fourth molten salt storage tank 104, temperature stratification from bottom to top and from low to high is formed in the D-layer open molten salt storage tank 1, and the low-temperature zone gradually moves upwards. When the low-temperature molten salt flows out from the overflow port 11 of the fourth molten salt storage tank 104, the low-temperature molten salt flows into the molten salt inlet 12 of the third molten salt storage tank 103 through the overflow pipe 2 under the action of gravity, and undergoes the heat exchange and flow process in the fourth molten salt storage tank 104 again. And completing the heat release process until all the molten salt in the first molten salt storage tank 101 of the plurality of molten salt storage tanks 1 is cooled to the target value.
The invention also provides a molten salt heat storage system which comprises the molten salt heat storage device 100 according to the embodiment of the invention.
Therefore, the molten salt heat storage system according to the embodiment of the invention has the advantages of convenience in enlarging the amount of molten salt storage, convenience in setting the molten salt heat storage device 10 and cost saving.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the above embodiments have been shown and described, it should be understood that they are exemplary and should not be construed as limiting the present invention, and that many changes, modifications, substitutions and alterations to the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A molten salt heat storage device, comprising:
a plurality of molten salt storage tanks, each molten salt storage tank is suitable for storing molten salt, each molten salt storage tank is provided with an overflow port and a molten salt inlet positioned below the overflow port, the plurality of molten salt storage tanks are arranged along the up-down direction, the overflow port positioned at the upper one of the two adjacent molten salt storage tanks is connected with the molten salt inlet positioned at the lower one of the two adjacent molten salt storage tanks, so that the molten salt in the molten salt storage tanks can overflow to the molten salt storage tank positioned below the overflow port;
any two adjacent fused salt storage tanks are connected through the corresponding overflow pipes, one ends of the overflow pipes are communicated with the corresponding overflow ports, and the other ends of the overflow pipes are communicated with the corresponding fused salt inlets;
an inlet of the circulation pipe is connected with the overflow port of the lowest one of the plurality of molten salt storage tanks, and an outlet of the circulation pipe is connected with the molten salt inlet of the highest one of the plurality of molten salt storage tanks;
the heat exchanger is arranged on the circulating pipe and is suitable for exchanging heat with the molten salt in the circulating pipe;
and the circulating pump is arranged on the circulating pipe or the overflow pipe and is suitable for driving the molten salt to circularly flow.
2. The molten salt heat storage device of claim 1, wherein the circulation pump is provided to the circulation pipe, and the circulation pump is located between the heat exchanger and the lowermost molten salt storage tank.
3. The molten salt heat storage device of claim 1, characterized in that the top of the molten salt storage tanks is open, the overflow outlet of each molten salt storage tank is provided near an upper edge of the molten salt storage tank, and the molten salt outlet of each molten salt storage tank is provided near a lower edge of the molten salt storage tank.
4. The molten salt heat storage device according to claim 3, characterized in that each molten salt tank includes a plurality of the overflow ports and a plurality of the molten salt inlets, the plurality of the overflow ports being arranged at intervals along a circumference of the molten salt tank, and the plurality of the molten salt inlets being arranged at intervals along the circumference of the molten salt tank.
5. The molten salt heat storage device of claim 1, comprising a splitter disposed at a bottom within the molten salt storage tank, the splitter having a splitting cavity and a plurality of splitting holes communicating with the splitting cavity, the splitting holes opening at a top of the splitter, an inlet of the splitter constituting a molten salt inlet of the molten salt storage tank.
6. The molten salt heat storage device according to claim 5, characterized in that the flow splitter comprises a plurality of first flow splitting pipes and a plurality of second flow splitting pipes, each of the plurality of first flow splitting pipes and the plurality of second flow splitting pipes is provided with the flow splitting hole, the plurality of first flow splitting pipes are arranged in parallel at intervals along a length direction of the molten salt storage tank, the plurality of second flow splitting pipes are arranged in parallel at intervals along a width direction of the molten salt storage tank, and each of the first flow splitting pipes is communicated with the plurality of second flow splitting pipes.
7. The molten salt heat storage device according to claim 6, characterized in that at least part of an end of the first shunt pipe extends to outside of the molten salt tank and forms the molten salt inlet, and at least part of an end of the second shunt pipe extends to outside of the molten salt tank and forms the molten salt inlet.
8. The molten salt heat storage device according to claim 1, wherein the plurality of overflow pipes comprise a plurality of first overflow pipes and a plurality of second overflow pipes, the plurality of first overflow pipes are arranged on one sides of the plurality of molten salt storage tanks, the plurality of second overflow pipes are arranged on the other sides of the plurality of molten salt storage tanks, and the plurality of first overflow pipes and the plurality of second overflow pipes are alternately arranged one by one along the flowing direction of the molten salt.
9. The molten salt heat storage device according to any one of claims 1 to 8, characterized in that an inlet of the circulation pipe is detachably connected to the overflow port of the corresponding molten salt storage tank, and an outlet of the circulation pipe is detachably connected to the molten salt inlet of the corresponding molten salt storage tank.
10. A molten salt heat storage system comprising a molten salt heat storage device, the molten salt heat storage device being as claimed in any one of claims 1 to 9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210369285.0A CN114674170B (en) | 2022-04-08 | 2022-04-08 | Molten salt heat storage device and molten salt heat storage system |
| JP2023551218A JP2024516482A (en) | 2022-04-08 | 2022-12-28 | Molten salt heat storage device and molten salt heat storage system |
| PCT/CN2022/142959 WO2023193487A1 (en) | 2022-04-08 | 2022-12-28 | Molten salt heat storage apparatus and molten salt heat storage system |
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| CN202210369285.0A CN114674170B (en) | 2022-04-08 | 2022-04-08 | Molten salt heat storage device and molten salt heat storage system |
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| CN114674170A true CN114674170A (en) | 2022-06-28 |
| CN114674170B CN114674170B (en) | 2023-11-07 |
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| Country | Link |
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| JP (1) | JP2024516482A (en) |
| CN (1) | CN114674170B (en) |
| WO (1) | WO2023193487A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023193487A1 (en) * | 2022-04-08 | 2023-10-12 | 西安热工研究院有限公司 | Molten salt heat storage apparatus and molten salt heat storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117739726B (en) * | 2024-02-19 | 2024-04-30 | 浙江昱华新能源科技有限公司 | High-capacity heat storage device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114674170B (en) * | 2022-04-08 | 2023-11-07 | 西安热工研究院有限公司 | Molten salt heat storage device and molten salt heat storage system |
-
2022
- 2022-04-08 CN CN202210369285.0A patent/CN114674170B/en active Active
- 2022-12-28 WO PCT/CN2022/142959 patent/WO2023193487A1/en active Application Filing
- 2022-12-28 JP JP2023551218A patent/JP2024516482A/en active Pending
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| US20120255706A1 (en) * | 2011-04-05 | 2012-10-11 | Saied Tadayon | Heat Exchange Using Underground Water System |
| US20170074597A1 (en) * | 2014-05-15 | 2017-03-16 | Basf Se | Device for storing a liquid |
| CN105115335A (en) * | 2014-08-07 | 2015-12-02 | 立昌先进科技股份有限公司 | Heat energy storage device with heat storage and heat release functions and application thereof |
| CN212109689U (en) * | 2020-04-08 | 2020-12-08 | 浙江嘉科新能源科技有限公司 | Layered heat accumulating type water tank and heat accumulating device |
| CN113531925A (en) * | 2020-04-15 | 2021-10-22 | 浙江大学 | Thermochemical heat storage system and heat storage method |
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| WO2023193487A1 (en) * | 2022-04-08 | 2023-10-12 | 西安热工研究院有限公司 | Molten salt heat storage apparatus and molten salt heat storage system |
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| Publication number | Publication date |
|---|---|
| WO2023193487A1 (en) | 2023-10-12 |
| JP2024516482A (en) | 2024-04-16 |
| CN114674170B (en) | 2023-11-07 |
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