Seawater desalination system based on solar fused salt heat storage

Abstract

The utility model belongs to the technical field of new energy development and utilization and seawater desalination, and relates to a seawater desalination system based on solar fused salt heat storage. Comprising a light condensation and heat collection system, a heat storage system, seawater desalination equipment, concentrated water treatment equipment, an air dryer, seawater advanced treatment equipment and a desalted water tank, a first fused salt output pipeline and a first fused salt input pipeline which are connected with the heat storage system are arranged on the light condensation and heat collection system; the heat storage system is connected with the seawater desalination equipment; a second fused salt output pipeline and a concentrated water output pipeline which are connected with the concentrated water treatment equipment are arranged on the seawater desalination equipment; a third fused salt output pipeline connected with the heat storage system is arranged on the concentrated water treatment equipment; the concentrated water treatment equipment is connected with the air dryer; the seawater desalination equipment is connected with the seawater deep treatment equipment; the device has the advantages of greenness, low carbon, high-efficiency circulation, comprehensive utilization of resources and the like, and meanwhile, high-efficiency production of fresh water is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to new energy development and utilization, seawater desalination technical field relates to a kind of seawater desalination system based on solar molten salt heat storage. BACKGROUND

[0002] Seawater desalination, as a crucial way to obtain fresh water resources, plays an irreplaceable role in ensuring the supply of drinking water for coastal residents, meeting the water demand of industrial boilers and other stable water supply needs. With the increasing scarcity of global water resources, the importance of seawater desalination technology has become increasingly prominent. It not only helps to solve the problem of water shortage, but also improves water quality, thereby ensuring the safety and sustainable use of water resources.

[0003] Currently, various technologies have been developed in the field of seawater desalination, including but not limited to seawater freezing method, electrodialysis method, distillation method, reverse osmosis method and ammonium carbonate ion exchange method. Among them, reverse osmosis membrane method and distillation method have become the mainstream technology in the market due to their high efficiency and practicality. However, the existing seawater desalination devices are generally complex in structure and expensive in cost, which to some extent limits the widespread application of seawater desalination technology. In order to promote the further development of seawater desalination technology, improve energy utilization efficiency and reduce energy consumption, more and more seawater desalination plants begin to try to use clean energy for seawater desalination. The application of clean energy such as solar energy, wind energy, nuclear energy and geothermal energy not only helps to save energy and reduce emissions, but also reduces the cost of seawater desalination and improves economic efficiency.

[0004] However, although the application prospect of clean energy in the field of seawater desalination is broad, how to realize the efficient use of clean energy such as solar energy is still an important problem currently faced. In particular, how to convert solar energy into heat energy or electric energy required for seawater desalination, and how to optimize the structure and performance of solar seawater desalination system to improve its overall efficiency and stability, are technical problems that need to be solved urgently. Therefore, the development of more efficient, energy-saving and environmentally friendly seawater desalination technology, as well as the optimization of the structure and performance of existing seawater desalination devices, is of great significance for promoting the widespread application of seawater desalination technology and ensuring the safety and sustainable use of water resources. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the technical problems in the prior art, and provides a seawater desalination system based on solar molten salt heat storage, which has the advantages of green low carbon, efficient circulation, resource comprehensive utilization, etc., and realizes efficient production of fresh water.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of seawater desalination system based on solar molten salt heat storage, including light-collecting heat collection system, heat storage system, seawater desalination equipment, concentrated water treatment equipment, air dryer, seawater advanced treatment equipment and desalted water tank;The light-collecting heat collection system is provided with the first molten salt output pipeline and the first molten salt input pipeline connected with heat storage system;The heat storage system and seawater desalination equipment are connected;The seawater desalination equipment is provided with the second molten salt output pipeline and concentrated water output pipeline connected with concentrated water treatment equipment;Concentrated water treatment equipment is provided with the third molten salt output pipeline connected with heat storage system;Concentrated water treatment equipment and air dryer are connected;Seawater desalination equipment and seawater advanced treatment equipment are connected;Seawater advanced treatment equipment and desalted water tank are connected.

[0008] Preferably, the light-collecting heat collection system includes heliostat and heat absorption tower; the heliostat is arranged around the heat absorption tower.

[0009] Preferably, the heat storage system includes cold salt tank, first low-temperature molten salt pump, second low-temperature molten salt pump, hot salt tank, first high-temperature molten salt pump and second high-temperature molten salt pump; the cold salt tank is connected with the heat absorption tower through the first molten salt input pipeline; the first low-temperature molten salt pump is arranged on the first molten salt input pipeline; the cold salt tank is connected with the concentrated water treatment equipment through the third molten salt output pipeline; the second low-temperature molten salt pump is arranged on the third molten salt output pipeline; the hot salt tank is connected with the heat absorption tower through the first molten salt output pipeline; the first high-temperature molten salt pump is arranged on the first molten salt output pipeline; the hot salt tank is connected with the seawater desalination equipment through the second high-temperature molten salt pump.

[0010] Preferably, the salt tank is a vertical cylindrical self-supporting dome tank; the salt tank adopts a fully welded structure and is arranged semi-underground; the outer wall of the salt tank is provided with a heat preservation layer.

[0011] Preferably, the seawater desalination equipment is provided with a first water inlet at the top; the sidewall of the seawater desalination equipment is provided with a first water outlet, a molten salt inlet and a molten salt outlet; the bottom of the seawater desalination equipment is provided with a concentrated water outlet; the inside of the seawater desalination equipment is provided with a water distribution pipe, a cooling tank, a second water inlet, a water collecting tank, a water outlet pipe and a seawater heat exchange pipe; the first water inlet is connected with the water distribution pipe; the water distribution pipe is communicated with the cooling tank; the cooling tank is provided below the water collecting tank; the bottom of the water collecting tank is communicated with the water outlet pipe; the water outlet pipe is connected with the first water outlet; the first water outlet is connected with the seawater advanced treatment equipment; the second water inlet is communicated with the cooling tank through a pipeline; the molten salt inlet is connected with the hot salt tank through the second high-temperature molten salt pump; the molten salt outlet is connected with the concentrated water treatment equipment through the second molten salt output pipeline; the molten salt inlet and the molten salt outlet are connected through the seawater heat exchange pipe; the concentrated water outlet is connected with the concentrated water treatment equipment.

[0012] Preferably, the concentrated water treatment equipment is provided with an air outlet at the top; the concentrated water treatment equipment is provided with a concentrated water distribution pipe and an air heat exchanger on the side wall; the air heat exchanger is provided with an air heat exchanger outlet, an air heat exchanger inlet and an air inlet; the concentrated water treatment equipment is provided with a coarse salt outlet at the bottom; the concentrated water treatment equipment is provided with a spray head and an air heat exchange pipe inside; the concentrated water distribution pipe is connected with a concentrated water output pipe; the concentrated water distribution pipe is provided with a spray head; the air inlet is connected with a blower; the air heat exchanger inlet is connected with a second molten salt output pipe; and the air heat exchanger outlet is connected with a third molten salt output pipe.

[0013] Preferably, the air dryer is provided with a dryer air inlet and a dryer air outlet on the side wall; the air dryer is provided with a dryer water outlet at the bottom; and the dryer air inlet is connected with the concentrated water treatment equipment.

[0014] Preferably, the seawater deep treatment equipment comprises a third water inlet, a membrane assembly and a second water outlet; the third water inlet and the second water outlet are connected through the membrane assembly; the third water inlet is connected with the seawater desalination equipment; and the second water outlet is connected with a desalted water tank.

[0015] Preferably, the membrane assembly is one or a combination of ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane.

[0016] Preferably, the molten salt comprises 40% KNO3 and 60% NaNO3 in terms of mass percentage.

[0017] Compared with the prior art, the system has the following beneficial effects:

[0018] The system couples solar molten salt heat storage and seawater desalination, concentrates and heats solar radiation energy through a light condensation and heat collection system, converts the solar radiation energy into heat energy, stores the heat energy generated by the light condensation and heat collection system in the form of high-temperature molten salt in a heat storage system, and provides heat energy to a seawater desalination equipment when needed. The seawater desalination equipment heats seawater to evaporate the seawater, thereby realizing desalination of the seawater. The concentrated water treatment equipment performs drying treatment on concentrated water, and the seawater desalination equipment uses the used high-temperature molten salt to provide heat for the drying treatment process, thereby realizing cascade utilization of the high-temperature molten salt heat. After the concentrated water treatment equipment uses the residual heat of the high-temperature molten salt, the residual heat is transported to the heat storage system to realize reuse of the molten salt. The system has the characteristics of green low carbon, efficient circulation and comprehensive utilization of resources, provides a new way for new energy development and utilization, provides a new idea for islands dominated by tourism to obtain fresh water resources, and has good treatment effect and wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0020] Figure 1 The structure schematic diagram of the seawater desalination system based on solar molten salt heat storage of the present application;

[0021] Wherein: 1-concentrated heat collection system; 101-heliostat; 102-heat absorption tower; 2-heat storage system; 201-cold salt tank; 202-first low-temperature molten salt pump; 203-second low-temperature molten salt pump; 204-hot salt tank; 205-first high-temperature molten salt pump; 206-second high-temperature molten salt pump; 3-seawater desalination equipment; 301-first water inlet; 302-water distribution pipe; 303-cooling tank; 304-second water inlet; 305-water collecting tank; 306-outlet pipe; 307-molten salt inlet; 308-molten salt outlet; 309-seawater heat exchange pipe; 310-first water outlet; 311-concentrated water outlet; 4-concentrated water treatment equipment; 401-air outlet; 402-concentrated water distribution pipe; 403-sprinkler head; 404-air heat exchanger outlet; 405-air heat exchanger inlet; 406-air inlet; 407-air heat exchange pipe; 408-coarse salt outlet; 409-blower; 5-air dryer; 501-dryer air inlet; 502-dryer air outlet; 503-dryer water outlet; 6-seawater advanced treatment equipment; 601-third water inlet; 602-membrane assembly; 603-second water outlet; 7-desalinated water tank. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0024] It should be noted that like reference numerals and letters refer to like items in the several views, and that no further definitions and explanations of a certain item are required in the subsequent drawings once the item has been defined in one drawing.

[0025] In the description of the embodiments of the utility model, it needs to be explained that if the terms "upper", "lower", "horizontal", "inner" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0026] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0027] In the description of the embodiments of the utility model, it also needs to be explained that unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] The utility model will be described in further detail below in combination with the drawings:

[0029] As Figure 1 shown, the utility model provides a kind of seawater desalination system based on solar molten salt heat storage, including light collecting and heat collecting system 1, heat storage system 2, seawater desalination equipment 3, concentrated water treatment equipment 4, air dryer 5, seawater advanced treatment equipment 6 and desalted water tank 7;First molten salt output pipeline and first molten salt input pipeline connected with heat storage system 2 are provided on the light collecting and heat collecting system 1;Heat storage system 2 and seawater desalination equipment 3 are connected;Second molten salt output pipeline and concentrated water output pipeline connected with concentrated water treatment equipment 4 are provided on the seawater desalination equipment 3;Third molten salt output pipeline connected with heat storage system 2 is provided on the concentrated water treatment equipment 4;Concentrated water treatment equipment 4 and air dryer 5 are connected;Seawater desalination equipment 3 and seawater advanced treatment equipment 6 are connected;Seawater advanced treatment equipment 6 and desalted water tank 7 are connected.

[0030] The light-concentrating and heat-collecting system 1 adopts a tower type light and heat technology with large light-concentration ratio, high working temperature, small heat loss and easy realization of large-scale and long-time heat storage. The light-concentrating and heat-collecting system 1 utilizes solar radiation energy for light concentration and heat collection, converts the solar radiation energy into heat energy, and thereby heats low-temperature molten salt to form high-temperature molten salt. The light-concentrating and heat-collecting system 1 delivers the high-temperature molten salt to the heat storage system 2 through the first molten salt output pipeline, and simultaneously receives low-temperature molten salt returned from the heat storage system 2 through the first molten salt input pipeline. The heat storage system 2 stores the heat energy generated by the light-concentrating and heat-collecting system in the form of storage of high-temperature molten salt, and provides high-temperature molten salt to the seawater desalination device 3 when needed. The seawater desalination device 3 utilizes the heat energy provided by the high-temperature molten salt to heat seawater, so that the seawater is evaporated, and thereby seawater desalination is realized. The water vapor after evaporation is condensed into fresh water and delivered to the seawater deep treatment device 6 and then stored in the desalted water tank 7, while the remaining concentrated water is delivered to the concentrated water treatment device 4 through the concentrated water output pipeline, the concentrated water treatment device 4 performs drying treatment on the concentrated water output from the seawater desalination device 3, the obtained coarse salt is deposited at the bottom of the concentrated water treatment device 4, and the obtained waste gas is discharged after dehydration treatment by the air dryer 5. The high-temperature molten salt used by the seawater desalination device 3 is delivered to the concentrated water treatment device 4 through the second molten salt output pipeline, for providing heat in the drying treatment process, realizing cascade utilization of high-temperature molten salt heat. After the concentrated water treatment device 4 utilizes the residual heat of the high-temperature molten salt, the high-temperature molten salt becomes low-temperature molten salt, and is delivered to the heat storage system 2 through the third molten salt output pipeline, realizing reuse of the molten salt. The desalted water tank 7 is used for storing desalted water.

[0031] The light-concentrating and heat-collecting system 1 includes heliostats 101 and a heat absorption tower 102, and the heliostats 101 are arranged around the heat absorption tower 102. The heliostats 101 can be rectangular, square, polygonal or circular heliostats, and the mirror field arrangement can adopt fan-shaped arrangement, ring-shaped arrangement or parallel arrangement. The sun is concentrated by the heliostats 101, and the concentrated sunlight is collected on the heat collector of the heat absorption tower 102, the molten salt is heated, and the storage of solar heat is realized.

[0032] The heat storage system 2 comprises a cold salt tank 201, a first low-temperature molten salt pump 202, a second low-temperature molten salt pump 203, a hot salt tank 204, a first high-temperature molten salt pump 205 and a second high-temperature molten salt pump 206; the cold salt tank 201 is connected with the heat absorption tower 102 through a first molten salt input pipeline; the first low-temperature molten salt pump 202 is arranged on the first molten salt input pipeline; the hot salt tank 204 is connected with the heat absorption tower 102 through a first molten salt output pipeline; the first high-temperature molten salt pump 205 is arranged on the first molten salt output pipeline; the molten salt is circulated from the heat storage system 2 to the concentrated light heat collection system 1 through the molten salt pump, and the low-temperature molten salt is changed into high-temperature molten salt. The cold salt tank 201 is connected with the concentrated water treatment equipment 4 through a third molten salt output pipeline; the second low-temperature molten salt pump 203 is arranged on the third molten salt output pipeline; the hot salt tank 204 is connected with the seawater desalination equipment 3 through the second high-temperature molten salt pump 206.

[0033] The heat storage system 2 adopts molten salt heat storage, and can realize 8-12 hours of heat storage time. The high-temperature molten salt from the concentrated light heat collection is pumped into the hot salt tank 204 through the high-temperature molten salt pump. Part of the high-temperature molten salt is consumed for seawater desalination during the day, and another part of the high-temperature molten salt can realize 12h storage. The seawater desalination equipment 3 is provided with a heat source at night without sunlight, so as to provide a stable heat source for the seawater desalination equipment 3 and ensure continuous and stable operation of the equipment. The molten salt is transported through the molten salt pump. The heat storage medium and the heat transfer medium of the heat storage system 2 are both binary molten salt, which comprises 40% KNO3 and 60% NaNO3 in mass percentage. The molten salt storage tank is a vertical cylindrical self-supporting dome tank. The salt tank adopts a full-welded structure, and a reinforcing structure is arranged underground to enhance the stability. An insulation layer is arranged on the outer wall of the salt tank, which can reduce heat loss.

[0034] The seawater desalination device 3 is provided with a first water inlet 301 at the top; the seawater desalination device 3 is provided with a first water outlet 310, a molten salt inlet 307 and a molten salt outlet 308 on the side wall; the seawater desalination device 3 is provided with a concentrated water outlet 311 at the bottom; the seawater desalination device 3 is internally provided with a water distribution pipe 302, a cooling tank 303, a second water inlet 304, a water collecting tank 305, a water outlet pipe 306 and a seawater heat exchange pipe 309; the first water inlet 301 and the water distribution pipe 302 are connected; the water distribution pipe 302 and the cooling tank 303 are communicated; the cooling tank 303 is provided below the water collecting tank 305; the bottom of the water collecting tank 305 and the water outlet pipe 306 are communicated; the water outlet pipe 306 and the first water outlet 310 are connected; the first water outlet 310 and the seawater advanced treatment device 6 are connected; the second water inlet 304 and the cooling tank 303 are communicated through a pipeline; the molten salt inlet 307 is connected through the second high-temperature molten salt pump 206 and the hot salt tank 204; the molten salt outlet 308 is connected through the second molten salt output pipeline and the concentrated water treatment device 4; the molten salt inlet 307 and the molten salt outlet 308 are connected through the seawater heat exchange pipe 309; the concentrated water outlet 311 and the concentrated water treatment device 4 are connected.

[0035] Seawater enters from the first water inlet 301 arranged at the top, and is uniformly arranged in the cooling tank 303 under the action of the water distribution pipe 302, and the seawater from the bottom of the cooling tank 303 enters the seawater desalination device 3 inside along the side wall in the form of overflow through the second water inlet 304 arranged on the side wall. The high-temperature molten salt from the heat storage and exchange system 2 is transported by the second high-temperature molten salt pump 206 to the molten salt inlet 307 arranged on the side wall of the device to enter the seawater heat exchange pipe 309, and heat exchange between the high-temperature molten salt and the seawater is realized in the seawater heat exchange pipe 309. The steam heated by the high-temperature molten salt overflows the water surface, and the steam exchanges heat with the seawater just entering the cooling tank 303, realizing condensation of the steam and recycling the heat in the steam to preheat the seawater. The condensed water formed by condensation is introduced to the water outlet pipe 306 through the bottom of the water collecting tank 305, and then discharged through the first water outlet 310. The high-temperature molten salt after heat exchange is discharged from the molten salt outlet 308 arranged on the side wall of the device as a heat source of the concentrated water treatment device, realizing step-by-step utilization of the heat of the high-temperature molten salt. The concentrated water is discharged into the concentrated water treatment device 4 through the concentrated water outlet 311 arranged at the bottom for further treatment.

[0036] The top of the concentrated water treatment equipment 4 is provided with an air outlet 401; the sidewall of the concentrated water treatment equipment 4 is provided with a concentrated water distribution pipe 402 and an air heat exchanger; the air heat exchanger is provided with an air heat exchanger outlet 404, an air heat exchanger inlet 405 and an air inlet 406; the bottom of the concentrated water treatment equipment 4 is provided with a coarse salt outlet 408; the inside of the concentrated water treatment equipment 4 is provided with a spray head 403 and an air heat exchange pipe 407; the concentrated water distribution pipe 402 is connected with a concentrated water output pipe; the spray head 403 is arranged on the concentrated water distribution pipe 402; the air inlet 406 is connected with a blower 409; the air heat exchanger inlet 405 is connected with a second molten salt output pipe; and the air heat exchanger outlet 404 is connected with a third molten salt output pipe.

[0037] The concentrated water treatment equipment 4 is a slender and high columnar reactor, the concentrated water enters the concentrated water treatment equipment 4 through the concentrated water distribution pipe 402, and then is atomized by the spray head 403. Under the action of gravity, the concentrated water moves downward along the device. The air enters the air heat exchanger from the air inlet 406 after being pressurized by the blower 409, and exchanges heat with the air heat exchanger. The heat source of the air heat exchanger comes from the high-temperature molten salt used by the seawater desalination equipment 3, so that the heat cascade utilization of the high-temperature molten salt is realized. The high-temperature molten salt heats the air, which serves as the heat source for the concentrated water drying treatment. The molten salt after heat exchange returns to the cold salt tank 201 through the second low-temperature molten salt pump 203. The hot air after heat exchange enters the concentrated water treatment equipment 4, and contacts the atomized concentrated water moving upward to realize the concentrated water drying treatment. The waste gas after the concentrated water is dried is discharged from the top air outlet 401 of the concentrated water treatment equipment 4 to the air dryer 5, and the coarse salt after drying is deposited at the bottom of the concentrated water treatment equipment 4 and is discharged regularly through the coarse salt outlet 408.

[0038] The sidewall of the air dryer 5 is provided with a dryer air inlet 501 and a dryer air outlet 502; the bottom of the air dryer 5 is provided with a dryer water outlet 503; and the dryer air inlet 501 is connected with the concentrated water treatment equipment 4. The air dryer 5 realizes the collection of water in the air by adsorption and cold drying. The waste gas after the concentrated water is dried enters the air dryer 5 from the air inlet 501, is dehydrated in the air dryer 5, and then is discharged from the dryer air outlet 502. The water formed after drying is discharged after reaching the standard through the dryer water outlet 503.

[0039] The seawater deep treatment equipment 6 comprises a third water inlet 601, a membrane assembly 602 and a second water outlet 603; the third water inlet 601 and the second water outlet 603 are connected through the membrane assembly 602; the third water inlet 601 is connected with the seawater desalination equipment 3; and the second water outlet 603 is connected with the desalted water tank 7. The membrane assembly 602 is one or a combination of several of an ultrafiltration membrane, a nanofiltration membrane and a reverse osmosis membrane. The water outlet from the first water outlet 310 of the seawater desalination equipment 3 enters the third water inlet 601 arranged at the top of the seawater deep treatment equipment 6, and, under the action of the membrane assembly, realizes deep treatment of seawater, and then enters the second water outlet 603 to enter the desalted water tank 7 for storage. The seawater deep treatment equipment 6 serves as a post-treatment equipment of the seawater desalination equipment, and ensures that the produced desalted water meets different production and life requirements.

[0040] The utility model discloses utilize new energy as the energy source of seawater desalination, can improve energy utilization efficiency and reduce energy consumption, with green, low carbon, environmental protection's characteristic. In the process of solar energy utilization, for realizing the continuous stable operation of seawater desalination equipment, introduced the tower type light and heat technology with large capacity, long time energy storage in the system, developed a kind of energy cascade utilization's seawater desalination equipment and concentrated water treatment equipment, realized the efficient production of fresh water.

[0041] The above is only preferred embodiment of the utility model, and does not limit the utility model, and for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A solar energy molten salt heat storage based seawater desalination system, characterized in that, The application relates to a solar energy sea water desalination system, which comprises a light-gathering heat collection system (1), a heat storage system (2), a sea water desalination device (3), a concentrated water treatment device (4), an air dryer (5), a sea water deep treatment device (6) and a desalted water tank (7).

2. The solar energy molten salt heat storage based seawater desalination system according to claim 1, characterized in that, The light-gathering heat collection system (1) comprises heliostats (101) and heat absorption towers (102), and the heliostats (101) are arranged around the heat absorption towers (102).

3. The solar energy molten salt heat storage based seawater desalination system according to claim 2, characterized in that, The heat storage system (2) comprises cold salt tanks (201), first low-temperature molten salt pumps (202), second low-temperature molten salt pumps (203), hot salt tanks (204), first high-temperature molten salt pumps (205) and second high-temperature molten salt pumps (206); the cold salt tanks (201) are connected with the heat absorption towers (102) through first molten salt input pipelines; the first molten salt input pipelines are provided with the first low-temperature molten salt pumps (202); the cold salt tanks (201) are connected with the concentrated water treatment device (4) through third molten salt output pipelines; the third molten salt output pipelines are provided with the second low-temperature molten salt pumps (203); the hot salt tanks (204) are connected with the heat absorption towers (102) through first molten salt output pipelines; the first molten salt output pipelines are provided with the first high-temperature molten salt pumps (205); and the hot salt tanks (204) are connected with the sea water desalination device (3) through the second high-temperature molten salt pumps (206).

4. The solar energy molten salt heat storage based seawater desalination system according to claim 3, characterized in that, The salt tank is a vertical cylindrical self-supporting dome tank, adopts a full-welded structure and is arranged semi-underground; and an insulating layer is arranged on the outer wall of the salt tank.

5. The solar salt-based thermal storage seawater desalination system according to claim 3, wherein, The seawater desalination equipment (3) is provided with a first water inlet (301) on the top; the seawater desalination equipment (3) is provided with a first water outlet (310), a molten salt inlet (307) and a molten salt outlet (308) on the side wall; the seawater desalination equipment (3) is provided with a concentrated water outlet (311) on the bottom; the seawater desalination equipment (3) is internally provided with a water distribution pipe (302), a cooling tank (303), a second water inlet (304), a water collecting tank (305), a water outlet pipe (306) and a seawater heat exchange pipe (309); the first water inlet (301) is connected with the water distribution pipe (302); the water distribution pipe (302) is communicated with the cooling tank (303); the cooling tank (303) is provided with the water collecting tank (305) below; the water collecting tank (305) is communicated with the water outlet pipe (306) on the bottom; the water outlet pipe (306) is connected with the first water outlet (310); the first water outlet (310) is connected with the seawater deep treatment equipment (6); the second water inlet (304) is communicated with the cooling tank (303) through a pipeline; the molten salt inlet (307) is connected with the hot salt tank (204) through the second high-temperature molten salt pump (206); the molten salt outlet (308) is connected with the concentrated water treatment equipment (4) through the second molten salt output pipeline; the molten salt inlet (307) and the molten salt outlet (308) are connected through the seawater heat exchange pipe (309); the concentrated water outlet (311) is connected with the concentrated water treatment equipment (4).

6. The solar salt-based thermal storage seawater desalination system of claim 1, wherein, The concentrated water treatment equipment (4) is provided with an air outlet (401) on the top; the concentrated water treatment equipment (4) is provided with a concentrated water distribution pipe (402) and an air heat exchanger on the side wall; the air heat exchanger is provided with an air heat exchanger outlet (404), an air heat exchanger inlet (405) and an air inlet (406); the concentrated water treatment equipment (4) is provided with a coarse salt outlet (408) on the bottom; the concentrated water treatment equipment (4) is internally provided with a spray head (403) and an air heat exchange pipe (407); the concentrated water distribution pipe (402) is connected with the concentrated water output pipeline; the concentrated water distribution pipe (402) is provided with the spray head (403); the air inlet (406) is connected with the air blower (409); the air heat exchanger inlet (405) is connected with the second molten salt output pipeline; the air heat exchanger outlet (404) is connected with the third molten salt output pipeline.

7. The solar salt-based thermal storage seawater desalination system of claim 1, wherein, The air dryer (5) is provided with a dryer air inlet (501) and a dryer air outlet (502) on the side wall; the air dryer (5) is provided with a dryer water outlet (503) on the bottom; the dryer air inlet (501) is connected with the concentrated water treatment equipment (4).

8. The solar salt-based thermal storage seawater desalination system of claim 1, wherein, The seawater deep treatment equipment (6) comprises a third water inlet (601), a membrane assembly (602) and a second water outlet (603); the third water inlet (601) and the second water outlet (603) are connected through the membrane assembly (602); the third water inlet (601) is connected with the seawater desalination equipment (3); the second water outlet (603) is connected with the desalted water tank (7).

9. The solar salt-based thermal storage seawater desalination system according to claim 8, wherein, The membrane module (602) is one or a combination of ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane. The membrane module (602) is one or a combination of ultrafiltration membrane, nanofiltration membrane and reverse osmosis membrane.

Images