CN114674170B - 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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- CN114674170B CN114674170B CN202210369285.0A CN202210369285A CN114674170B CN 114674170 B CN114674170 B CN 114674170B CN 202210369285 A CN202210369285 A CN 202210369285A CN 114674170 B CN114674170 B CN 114674170B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 379
- 238000005338 heat storage Methods 0.000 title claims abstract description 53
- 238000004891 communication Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram 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
- 230000003993 interaction Effects 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
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
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Other Air-Conditioning Systems (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
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 positioned below the overflow ports, the molten salt storage tanks are distributed along the up-down direction, and the overflow port positioned above one of the two adjacent molten salt storage tanks is connected with the molten salt inlet positioned below one of the 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 tanks below the molten salt storage tanks; the molten salt storage tanks are connected with one another through the corresponding overflow pipes; the inlet of the circulating pipe is connected with the overflow port of the lowest one of the molten salt tanks, and the outlet of the circulating pipe is connected with the molten salt inlet of the highest one of the molten salt 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 being convenient for expanding the molten salt storage amount, being convenient for setting and saving cost.
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 fused salt heat storage technology has the advantages of low price, safe and stable system, high working temperature, environmental protection and incombustibility. During heat accumulation, the temperature is raised by absorbing external heat, and during heat release, the temperature of the output medium is raised by heat exchange. In the related art, the single-tank molten salt heat storage technical scheme based on the fluid inclined temperature layer principle is preliminarily applied, so that the construction investment cost of a molten salt heat storage system can be greatly reduced, and related systems are simplified. However, as the fused salts with different temperature parameters are mixed and stored in the same tank body, the higher requirements are put on the operation control of the system. In addition, the single-tank fused salt heat storage technical scheme can not simply expand the capacity.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. 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 tanks adapted to store molten salt, each of the molten salt tanks having an overflow port and a molten salt inlet located below the overflow port, the plurality of molten salt tanks being arranged in an up-down direction, the overflow port of an upper one of the adjacent two of the molten salt tanks being connected to the molten salt inlet of a lower one of the adjacent two of the molten salt tanks so as to be adapted to the molten salt in the molten salt tank being overflowable to the molten salt tank therebelow;
the molten salt storage tanks are connected through the corresponding overflow pipes, one end of each overflow pipe is communicated with the corresponding overflow port, and the other end of each overflow pipe is communicated with the corresponding molten salt inlet;
a circulating pipe, wherein an inlet of the circulating pipe is connected with the overflow port of the lowest one of the molten salt storage tanks, and an outlet of the circulating pipe is connected with the molten salt inlet of the highest one of the molten salt storage tanks;
the heat exchanger is arranged on the circulating pipe and is suitable for exchanging heat with 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 provided by the embodiment of the invention has the advantages of convenience in expanding the molten salt storage amount, 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 port of each molten salt storage tank is arranged near the upper edge position of the molten salt storage tank, and the molten salt outlet of each molten salt storage tank is arranged near the lower edge position of the molten salt storage tank.
In some embodiments, each of the molten salt tanks includes a plurality of overflow ports and a plurality of molten salt inlets, the plurality of overflow ports being spaced circumferentially along the molten salt tank, the plurality of molten salt inlets being spaced circumferentially along the molten salt tank.
The molten salt heat storage device comprises a flow divider, wherein the flow divider is arranged at the bottom in a molten salt storage tank and is provided with a flow dividing cavity and a plurality of flow dividing holes communicated with the flow dividing cavity, the flow dividing Kong Kaishe is arranged at the top of the flow divider, and an inlet of the flow divider forms a molten salt inlet of the molten salt storage tank.
In some embodiments, the diverter comprises a plurality of first shunt tubes and a plurality of second shunt tubes, each of the plurality of first shunt tubes and the plurality of second shunt tubes is provided with the shunt holes, the plurality of first shunt tubes are arranged at intervals in parallel along the length direction of the molten salt storage tank, the plurality of second shunt tubes are arranged at intervals in parallel along the width direction of the molten salt storage tank, and each of the first shunt tubes is communicated with the plurality of second shunt tubes.
In some embodiments, at least a portion of the end of the first shunt tube extends outside of the molten salt tank and forms the molten salt inlet, and at least a portion of the end of the second shunt tube extends outside of the molten salt tank and forms the molten salt inlet.
In some embodiments, the plurality of overflow pipes includes a plurality of first overflow pipes and a plurality of second overflow pipes, the plurality of first overflow pipes are disposed on one side of the plurality of molten salt tanks, the plurality of second overflow pipes are disposed on the other side of the plurality of molten salt tanks, and the plurality of first overflow pipes and the plurality of second overflow pipes are alternately arranged one by one along a flow direction of the molten salt.
In some embodiments, the inlet of the circulation tube is detachably connected to the overflow port of the corresponding molten salt tank, and the outlet of the circulation tube is detachably connected to the molten salt inlet of the corresponding molten salt tank.
The invention also provides a molten salt heat storage system, which comprises a molten salt heat storage device, wherein the molten salt heat storage device is the molten salt heat storage device.
Drawings
Fig. 1 is a schematic diagram of a molten salt heat storage device according to an embodiment of the invention.
FIG. 2 is a schematic illustration of a molten salt tank according to an embodiment of the invention.
FIG. 3 is an enlarged partial 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 port 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 and a fourth side plate 17;
an overflow pipe 2, a first overflow pipe 21, a second overflow pipe 22;
a circulation pipe 3, an inlet 31 of the circulation pipe 3, and an outlet 32 of the circulation pipe 3;
a heat exchanger 4;
a circulation pump 5;
a shunt 6, a first shunt tube 61, a second shunt tube 62, and a shunt 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 by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The molten salt heat storage device 100 of the embodiment of the 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 storage 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 port 11 and a molten salt inlet 12 located below the overflow port 11. The plurality of molten salt storage tanks 1 are arranged along the up-down direction, and overflow ports 11 of one, which is positioned above, of the two adjacent molten salt storage tanks 1 are connected with molten salt inlets 12 of one, which is positioned below, of the two adjacent molten salt storage tanks 1 so as to be suitable for the molten salt in the molten salt storage tanks 1 to overflow to the molten salt storage tanks 1 below. Any two adjacent molten 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 molten 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 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 tanks 1. A heat exchanger 4 is provided on the circulation pipe 3 to be adapted to exchange heat with molten salt in the circulation pipe 3. A circulation pump 5 is arranged on the circulation pipe 3 or the overflow pipe 2, and the circulation pump 5 is suitable for driving molten salt to circulate.
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 capacity of the molten salt heat storage device 100 can be improved, and the heat storage capacity of the molten salt heat storage device 100 can be improved. And a plurality of molten salt storage tanks 1 are arranged along the up-down direction, and overflow ports 11 of one, which is positioned above, of two adjacent molten salt storage tanks 1 are connected with molten salt inlets 12 of one, which is positioned below, of two adjacent molten salt storage tanks 1 so as to be suitable for the molten salt in the molten salt storage tanks 1 to overflow to the molten salt storage tanks 1 below. Thus, after the circulating pump 5 drives the molten salt to circulate and exchange heat with the heat exchanger 4, the molten salt enters the uppermost one of the plurality of molten salt tanks 1 through the outlet 32 of the circulating pipe 3 and exchanges heat with the molten salt in the uppermost molten salt tank 1. As the molten salt in the uppermost molten salt tank 1 increases gradually, the overflow port 11 of the uppermost molten salt tank 1 overflows a part of the molten salt and flows into the molten salt tank 1 adjacent to the uppermost molten salt tank 1 through the overflow pipe 2 under the action of gravity and exchanges heat with the molten salt in the molten salt tank 1. In the continuous operation of the circulation pump 5, after the molten salt in the upper one of the two adjacent molten salt tanks 1 is gradually increased, a part of the molten salt overflows from the overflow port 11 of the upper one of the two adjacent molten salt tanks 1 to the lower one of the two adjacent molten salt tanks 1 and exchanges heat with the molten salt in the lower one of the two adjacent molten salt tanks 1. That is, the plurality of molten salt tanks 1 arranged in the up-down direction can convey the molten salt in one of the adjacent two molten salt tanks 1 located above to one of the adjacent two molten salt tanks 1 located below through the overflow port 11 and exchange heat. Thereby make a plurality of molten salt storage tanks 1 that arrange along upper and lower direction carry the fused salt comparatively convenient and the energy saving between, and then make the fused salt heat storage device 100 can enlarge the setting condition simple on the basis of fused salt memory space, practice thrift manufacturing cost.
Therefore, the molten salt heat storage device 100 according to the embodiment of the invention has advantages of convenience in expanding 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 storage 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 along 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 as to improve the molten salt storage amount of the molten salt heat storage device 100. Each molten salt storage tank 1 is provided with an overflow port 11 and a molten salt inlet 12 positioned below the overflow port 11, and the top of the molten salt storage tank 1 is open, so that the air pressure in the molten salt storage tank 1 is consistent with the outside, and the molten salt in the molten salt storage tank 1 is convenient to overflow outwards from the overflow port 11. 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 and 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 port 11 of each molten salt tank 1 is provided near the upper edge position of the molten salt tank 1, and the molten salt outlet of each molten salt tank 1 is provided near the lower edge position of the molten salt tank 1. Thus, 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 can be increased.
The overflow port 11 of the upper one of the two adjacent molten salt tanks 1 is connected with the molten salt inlet 12 of the lower one of the two adjacent molten salt tanks 1 so as to be suitable for the molten salt in the molten salt tank 1 to overflow to the lower molten salt tank 1. Any two adjacent molten 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 molten salt inlets 12. Specifically, one end (upper end) of the overflow pipe 2 is connected to the overflow port 11 of the upper one of the adjacent two molten salt tanks 1, and the other end (lower end) of the overflow pipe 2 is connected to the molten salt inlet 12 of the lower one of the adjacent two molten salt tanks 1. Thus, after the molten salt is continuously injected into one of the two adjacent molten salt storage tanks 1 located above, one of the two adjacent molten salt storage tanks 1 located above can overflow a part of the molten salt to the other adjacent molten salt storage tank 1 located below through the overflow pipe 2 through the overflow port 11 on the upper part.
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 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 tanks 1. A heat exchanger 4 is provided on the circulation pipe 3 to be adapted to exchange heat with molten salt in the circulation pipe 3. A circulation pump 5 is arranged on the circulation pipe 3 or the overflow pipe 2, and the circulation pump 5 is suitable for driving molten salt to circulate. Thereby, the molten salt in the lowest one of the plurality of molten salt 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 into the uppermost molten salt tank 1 for heat exchange.
In some embodiments, a circulation pump 5 is provided to the circulation pipe 3, and the circulation pump 5 is located between the heat exchanger 4 and the lowermost molten salt tank 1. Thereby being convenient for quickly conveying molten salt in the lowest one of the molten salt storage tanks 1 into the circulating pipe 3 to exchange heat with the heat exchanger 4, and further improving the heat exchange efficiency.
As shown in fig. 1 and 2, in some embodiments, each molten salt tank 1 includes a plurality of overflow ports 11 and a plurality of molten salt inlets 12, the plurality of overflow ports 11 being arranged at intervals along the circumference of the molten salt tank 1, and the plurality of molten salt inlets 12 being arranged at intervals along the circumference of the molten salt tank 1. The plurality of overflow ports 11 and the plurality of molten salt inlets 12 facilitate the arrangement of the positions and the number of the overflow pipes 2 between two adjacent molten salt storage tanks 1 according to actual conditions. Specifically, the overflow pipe 2 is connected with the overflow ports 11 and the molten salt inlets 12 on the same side of the two adjacent molten salt storage tanks 1, so that the overflow pipe 2 can be conveniently installed. When it is desired to increase the flow rate of molten salt between two adjacent molten salt tanks 1, the number of overflow pipes between two adjacent molten salt tanks 1 can be increased. For example, the overflow port 11 and the molten salt inlet 12 of each molten salt tank 1 are 4, 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 the molten salt inlet 12, and two overflow pipes 2 are provided between two adjacent molten salt 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 on one side of the plurality of molten salt tanks 1, the plurality of second overflow pipes 22 are provided on the other side of the plurality of molten salt 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, in the flow direction of the molten salt, the plurality of overflow pipes 2 are alternately arranged on the side of the molten salt tank 1, 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) is provided on the right side of the molten salt tank 1, a second overflow pipe 2 (second overflow pipe 22) may be provided on the left side of the molten salt tank 1, and a third overflow pipe 2 (first overflow pipe 21) may be provided on the right side or the front-rear side of the molten salt tank 1. The left-right direction and the front-rear 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 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 tank 1. Thus, when the molten salt reserve of the molten salt heat storage device 100 needs to be amplified, after the molten salt storage tanks 1 are added above and below the original plurality of molten salt storage tanks 1, the inlet 31 of the circulating pipe 3 is connected with the overflow port 11 located at the lowest one of the added plurality of molten salt storage tanks 1, and the outlet 32 of the circulating pipe 3 is connected with the molten salt inlet 12 located at the highest one of the added plurality of molten salt storage tanks 1. . Specifically, when the molten salt storage tanks 1 are newly added above the original plurality of molten salt storage tanks 1, the outlet 32 of the circulating pipe 3 is connected with the added molten salt storage tank 1 positioned at the uppermost position, and when the molten salt storage tanks 1 are newly added below the original plurality of molten salt storage tanks 1, the inlet 31 of the circulating pipe 3 is connected with the added molten salt storage tank 1 positioned at the lowermost position.
As shown in fig. 2 and 3, the molten salt heat storage device 100 according to the embodiment of the invention includes a diverter 6, the diverter 6 is disposed at the bottom in the molten salt storage tank 1, the diverter 6 has a diverter cavity and a plurality of diverter holes 63 communicating with the diverter cavity, the diverter holes 63 are disposed at the top of the diverter 6, and the inlet of the diverter 6 forms the molten salt inlet 12 of the molten salt storage tank 1. From this, can make the entering fused salt get into the reposition of redundant personnel intracavity of shunt 6 first, then through a plurality of reposition of redundant personnel holes 63 with reposition of redundant personnel intracavity intercommunication with fused salt heat transfer in the fused salt storage tank 1, a plurality of reposition of redundant personnel holes 63 with reposition of redundant personnel chamber intercommunication can make fused salt heat transfer more even to improve heat transfer efficiency.
In some embodiments, the shunt 6 includes a plurality of first shunt tubes 61 and a plurality of second shunt tubes 62, each of the plurality of first shunt tubes 61 and the plurality of second shunt tubes 62 being provided with a shunt aperture 63. The plurality of first shunt tubes 61 are arranged at intervals in parallel along the length direction of the molten salt storage tank 1, the plurality of second shunt tubes 62 are arranged at intervals in parallel along the width direction of the molten salt storage tank 1, and each of the first shunt tubes 61 is communicated with the plurality of second shunt tubes 62. Thereby, the molten salt can be made to exchange heat with the molten salt in the molten salt storage tank 1 uniformly through the diversion holes 63 at the top 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 entry of molten salt into the flow divider 6 (first shunt tube 61 and second shunt tube 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 one specific embodiment, the plurality of molten salt tanks 1 includes a first molten salt tank 101, a second molten salt tank 102, a third molten salt tank 103, and a fourth molten salt tank 104, which are disposed in this order from bottom to top. The inlet 31 of the circulation pipe 3 is connected to the overflow port 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. So that molten salt in the first molten salt storage tank 101 enters the circulating pipe 3 under the action of the circulating pump 5 and exchanges heat with the heat exchanger and then is conveyed into the fourth molten salt storage tank 104 for heat exchange.
During heat accumulation, low-temperature molten salt flows out from the overflow interface 8 of the first molten salt storage tank 101, and under the action of the circulating pump 5, the molten salt in the circulating pipe 3 can absorb heat with the heat exchanger 4 to raise temperature. After that, the high-temperature molten salt is introduced into the molten salt inlet 12 of the fourth molten salt storage tank 104 through the circulating pipe 3, and uniformly flows out through the flow dividing holes 63 after entering the flow divider 6 of the fourth molten salt storage tank 104, 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 molten salt temperatures in the first molten salt storage tanks 101 of the plurality of molten salt storage tanks 1 reach the standard.
During heat release, high-temperature molten salt flows out from the overflow port 11 of the first molten salt storage tank 101, and under the action of the circulating pump 5, the molten salt in the circulating pipe 3 can be released heat and cooled with the heat exchanger 4. 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, uniformly flows out through the flow dividing holes 63 after entering the flow divider 6 of the fourth molten salt storage tank 104, forms temperature stratification from bottom to top and from low to high in the D-layer open molten salt storage tank 1, and gradually moves upwards in a low-temperature zone. 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 processes in the fourth molten salt storage tank 104 again. And completing the heat release process until all molten salt in the first molten salt storage tanks 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 facilitating expansion of the molten salt storage amount, facilitating setting of the molten salt heat storage device 10, and saving cost.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (9)
1. A molten salt heat storage device, comprising:
the molten salt storage tanks are 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 molten salt storage tanks are distributed in the up-down direction, the overflow port positioned above one of the two adjacent molten salt storage tanks is connected with the molten salt inlet positioned below one of the 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 tanks below the molten salt storage tanks, and the top of each molten salt storage tank is open;
the molten salt storage tanks are connected through corresponding overflow pipes, one end of each overflow pipe is communicated with a corresponding overflow port, the other end of each overflow pipe is communicated with a corresponding molten salt inlet, the overflow port of each molten salt storage tank is arranged at a position close to the upper edge of the molten salt storage tank, and the molten salt outlet of each molten salt storage tank is arranged at a position close to the lower edge of the molten salt storage tank;
a circulating pipe, wherein an inlet of the circulating pipe is connected with the overflow port of the lowest one of the molten salt storage tanks, and an outlet of the circulating pipe is connected with the molten salt inlet of the highest one of the molten salt storage tanks;
the heat exchanger is arranged on the circulating pipe and is suitable for exchanging heat with 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 tank.
3. The molten salt heat storage device of claim 1, wherein each molten salt tank includes a plurality of overflow ports and a plurality of molten salt inlets, the plurality of overflow ports being arranged at intervals along a circumference of the molten salt tank, the plurality of molten salt inlets being arranged at intervals along the circumference of the molten salt tank.
4. The molten salt heat storage device of claim 1, comprising a diverter disposed at a bottom within the molten salt tank, the diverter having a diverter chamber and a plurality of diverter apertures in communication with the diverter chamber, the diverter Kong Kaishe being at a top of the diverter, an inlet of the diverter constituting a molten salt inlet of the molten salt tank.
5. The molten salt heat storage device of claim 4, wherein the flow divider comprises a plurality of first flow dividing pipes and a plurality of second flow dividing pipes, each of the plurality of first flow dividing pipes and the plurality of second flow dividing pipes is provided with the flow dividing holes, the plurality of first flow dividing pipes are arranged at intervals in parallel along the length direction of the molten salt storage tank, the plurality of second flow dividing pipes are arranged at intervals in parallel along the width direction of the molten salt storage tank, and each of the first flow dividing pipes is communicated with the plurality of second flow dividing pipes.
6. The molten salt heat storage device of claim 5, wherein at least a portion of the ends of the first shunt tubes extend outside of the molten salt tank and form the molten salt inlet, and at least a portion of the ends of the second shunt tubes extend outside of the molten salt tank and form the molten salt inlet.
7. The molten salt heat storage device of claim 1, wherein the plurality of overflow pipes includes 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 a flow direction of the molten salt.
8. The molten salt heat storage device of any one of claims 1 to 7 wherein the inlet of the circulation pipe is detachably connected to the overflow port of the corresponding molten salt tank and the outlet of the circulation pipe is detachably connected to the molten salt inlet of the corresponding molten salt tank.
9. A molten salt heat storage system comprising a molten salt heat storage device as claimed in any one of claims 1 to 8.
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| 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 |
| PCT/CN2022/142959 WO2023193487A1 (en) | 2022-04-08 | 2022-12-28 | Molten salt heat storage apparatus 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 |
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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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| CN114674170B true CN114674170B (en) | 2023-11-07 |
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| JP (1) | JP2024516482A (en) |
| CN (1) | CN114674170B (en) |
| WO (1) | WO2023193487A1 (en) |
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| 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 |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN113847109A (en) * | 2021-09-26 | 2021-12-28 | 西安热工研究院有限公司 | Electric heating comprehensive energy storage peak regulation system of coal electric unit and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120255706A1 (en) * | 2011-04-05 | 2012-10-11 | Saied Tadayon | Heat Exchange Using Underground Water System |
| CN106662411B (en) * | 2014-05-15 | 2019-03-01 | 巴斯夫欧洲公司 | Equipment for storing liquid |
| 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 |
-
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- 2022-04-08 CN CN202210369285.0A patent/CN114674170B/en active Active
- 2022-12-28 WO PCT/CN2022/142959 patent/WO2023193487A1/en active Application Filing
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113847109A (en) * | 2021-09-26 | 2021-12-28 | 西安热工研究院有限公司 | Electric heating comprehensive energy storage peak regulation system of coal electric unit and working method |
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|---|---|
| JP2024516482A (en) | 2024-04-16 |
| CN114674170A (en) | 2022-06-28 |
| WO2023193487A1 (en) | 2023-10-12 |
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Application publication date: 20220628 Assignee: HUANENG INTERNATIONAL POWER CO.,LTD. DEZHOU POWER PLANT Assignor: Xi'an Thermal Power Research Institute Co.,Ltd. Contract record no.: X2023980054524 Denomination of invention: Molten salt thermal storage device and molten salt thermal storage system Granted publication date: 20231107 License type: Common License Record date: 20231229 |