A device for fully utilizing LNG energy and a method for using the same

Abstract

The present invention discloses a device and a method for using LNG energy, including a cold storage refrigeration cycle device, an absorption refrigeration cycle device, a seafood drying device, an LNG delivery pipe and an internal combustion engine; after the LNG delivery pipe exchanges heat with the cold storage refrigeration cycle device, LNG gasification is used to provide coldness for the refrigerant, and the gasified LNG is used as the internal combustion engine fuel to drive the refrigeration cycle of the cold storage refrigeration cycle device; the direct heat generated by the combustion of the internal combustion engine provides heat for the absorption refrigeration cycle device, and the high-temperature and high-pressure refrigerant exchanges heat with the seafood drying device. The refrigerant after the heat exchange becomes a low-temperature and low-pressure liquid, and the seawater is refrigerated to make the seawater freeze; the flue gas after the combustion of the internal combustion engine provides heat for the seafood drying device to achieve the drying of seafood. The beneficial effects of the present invention are: the coldness contained in LNG and the energy and heat released by combustion are fully utilized, and the efficiency of the circulation system is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization equipment, and in particular to equipment for fully utilizing LNG energy and a method for using the equipment. Background Art

[0002] Freezing of aquatic products refers to a low-temperature preservation method that uses low temperature conditions to inhibit the activity of autolytic enzymes and the reproduction of attached microorganisms in aquatic products, and slows down the rate of chemical reactions such as lipid oxidation and non-enzymatic browning, so that the products can maintain good quality during storage. It generally includes two methods: refrigeration preservation and freezing preservation. There are many seafoods in coastal areas. If the fresh seafoods are not properly preserved after being caught, they are likely to rot before being transported out of the fishing area. Aquatic products are not easy to preserve and are easy to breed bacteria. Therefore, they need to be refrigerated to delay their life metabolism as much as possible, maintain their freshness, and make the seafoods be preserved for a long time. In the current fishing operations, the caught seafoods are generally frozen in time, and then they need to be transported inland for a second time or supplemented with cold energy after landing to ensure that the seafoods are transported inland with good quality. Freezing these seafoods usually requires a lot of cold energy. Usually, liquefied natural gas is stored in low-temperature storage tanks at -161.5℃ and about 0.1MPa. Before supplying to downstream users, it must be gasified and heated, and a large amount of cold energy will be released during the gasification process. The cold energy released when LNG (liquefied natural gas) is gasified is about 840kJ / kg. For a 3 million tons / year LNG receiving station, if LNG is continuously and evenly gasified, the cold energy released is about 80MW. Therefore, the cold energy contained in LNG is very huge, and recycling this part of energy has considerable economic, social and environmental benefits.

[0003] Therefore, part of the cold energy generated by LNG gasification can be used to quickly freeze the seafood that has just been salvaged, while some seafood needs to be dried to remove moisture for storage, so a device that takes both methods of processing seafood into account is needed to meet the needs. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a device and a method for using LNG energy. Compared with the prior art, the utilization effect of LNG energy is improved, and the utilization rate of primary energy is also improved.

[0005] The technical solution of the present invention is:

[0006] A device that fully utilizes LNG energy, characterized in that it includes a cold storage refrigeration cycle device, an absorption refrigeration cycle device, a seafood drying device, an LNG delivery pipe and an internal combustion engine; after the LNG delivery pipe exchanges heat with the cold storage refrigeration cycle device, LNG is gasified to provide cooling capacity for the refrigerant, and the gasified LNG is used as the internal combustion engine fuel to drive the refrigeration cycle of the cold storage refrigeration cycle device; the direct heat generated by the combustion of the internal combustion engine provides heat for the absorption refrigeration cycle device, and heat is exchanged with the seafood drying device through the high-temperature and high-pressure refrigerant. After the heat exchange, the refrigerant becomes a low-temperature and low-pressure liquid, which refrigerates seawater to make it freeze; the flue gas after the combustion of the internal combustion engine provides heat for the seafood drying device to achieve the drying of seafood.

[0007] The equipment that fully utilizes LNG energy is characterized in that the cold storage refrigeration cycle device includes a cold storage, a throttle valve, a flow meter, an LNG delivery pipe, a first condensing heat exchanger, a compressor and a refrigerant circulation pipeline. The cold storage, throttle valve, flow meter, first condensing heat exchanger and compressor are arranged in sequence on the refrigerant circulation pipeline. The LNG delivery pipe is connected to the first condensing heat exchanger. The high-temperature and high-pressure refrigerant in the first condensing heat exchanger transfers heat to the LNG delivery pipe, so that the LNG in the LNG delivery pipe is gasified. After the LNG is gasified, it is used for combustion in an internal combustion engine. The internal combustion engine is connected to the compressor in a transmission connection. After the internal combustion engine is burned, it drives the refrigerant cooling cycle by driving the compressor.

[0008] The equipment for making full use of LNG energy is characterized in that the absorption refrigeration cycle device includes a throttle valve, a seawater filter, a generator, a first seawater heat exchanger, a second seawater heat exchanger, a first seawater circulation pump, a seawater delivery pipeline and a refrigerant circulation pipeline. The seawater filter and the first seawater circulation pump are sequentially arranged on the seawater delivery pipeline, the seawater delivery pipeline is connected to the first seawater heat exchanger, and the generator, the second seawater heat exchanger and the first seawater heat exchanger are sequentially arranged on the refrigerant circulation pipeline; the direct heat of the internal combustion engine combustion provides a heat source for the generator, and the high-temperature and high-pressure refrigerant in the generator exchanges heat with the seafood drying device when passing through the second seawater heat exchanger, and after the heat exchange, it becomes a low-temperature and low-pressure liquid and passes through the first seawater heat exchanger to refrigerate the seawater so that the seawater is frozen, and the frozen seawater is separated into ice and water, wherein the ice cubes are used to melt to produce fresh water, and the concentrated seawater is used to produce sea salt.

[0009] The equipment that makes full use of LNG energy is characterized in that the seafood drying device includes a first seawater circulation pump, a second flue gas heat exchanger, a second seawater heat exchanger, a drying room, a drying vehicle, a first flue gas heat exchanger, a fresh water collector, a water reservoir, a second seawater circulation pump, a seawater spray pipeline and a flue gas discharge pipeline. The first seawater circulation pump, the second seawater heat exchanger, the second flue gas heat exchanger and the second seawater circulation pump are all arranged on the seawater spray pipeline, and the second condensing heat exchanger is arranged on the seawater spray pipeline for secondary heating of seawater; the drying vehicle is provided with a fresh water collecting pipeline, and the fresh water collecting pipeline is connected to the water reservoir after passing through the second seawater heat exchanger; the drying room is provided with a condensed water collecting pipeline, and the condensed water collecting pipeline The first flue gas heat exchanger and the second flue gas heat exchanger are both arranged on the flue gas discharge pipeline. The flue gas after combustion of the internal combustion engine is directly used to heat seawater, so that the seawater sprayed to the flue gas heat exchange tube directly evaporates into water vapor. The remaining concentrated seawater is discharged through the bottom valve of the flue gas heat exchanger for making sea salt. The water vapor is used for full heat exchange in the drying car through the drying room, so that the temperature in the drying car continues to rise. The high-temperature and high-pressure water vapor outside the drying car is liquefied after heat exchange and collected in the fresh water collector as the produced fresh water. The temperature in the drying car continues to rise, so that the water on the surface of the seafood continues to evaporate. The water vapor evaporated from the seafood passes through the second seawater heat exchanger to heat the seawater for the first time and then condenses and collects in the fresh water reservoir as the produced fresh water.

[0010] The method for using the equipment for fully utilizing LNG energy is characterized by comprising the following steps:

[0011] 1) Cold storage refrigeration cycle:

[0012] LNG in the LNG transmission pipeline exchanges heat with high-temperature and high-pressure refrigerant in the first condensing heat exchanger. The high-temperature and high-pressure refrigerant transfers heat to LNG, which accelerates the gasification of LNG. After gasification, LNG can be used for combustion in internal combustion engines. After combustion in internal combustion engines, the compressor drives the refrigeration cycle. The cold energy generated by LNG gasification allows a large amount of refrigerant to take away a large amount of heat when passing through the cold storage.

[0013] 2) Drying of seafood surface:

[0014] The heat of flue gas after combustion in the internal combustion engine causes seawater to be sprayed from the outlet of the seawater spray pipeline to the first flue gas heat exchange tube and directly evaporated into water vapor. The remaining concentrated seawater is discharged through the bottom valve of the flue gas heat exchanger for the production of sea salt. The evaporated water vapor is used for sufficient heat exchange in the drying car through the drying room, so that the temperature inside the drying car continues to rise. The high-temperature and high-pressure water vapor outside the drying car is liquefied after heat exchange and collected through the fresh water collection pipeline to the fresh water collector as the produced fresh water; the temperature inside the drying car continues to rise, so that the moisture on the surface of the seafood continues to evaporate, and the water vapor evaporated from the seafood passes through the second seawater heat exchanger to heat the seawater for the first time, and then condenses and is collected through the condensed water collection pipeline to the condensed water fresh water reservoir as the produced fresh water.

[0015] 3) Absorption refrigeration cycle:

[0016] The direct heat from the combustion of the internal combustion engine provides a heat source for the generator. The high-temperature and high-pressure refrigerant in the generator passes through the second condensing heat exchanger to secondary heat the seawater in the seawater spray pipeline through heat exchange. The high-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure liquid after passing through the second condensing heat exchanger and cools the seawater from the seawater transmission pipeline after passing through the first seawater heat exchanger to freeze the seawater. The frozen seawater is separated into ice and water, wherein the ice is melted to produce fresh water, and the concentrated seawater is used to produce sea salt.

[0017] The beneficial effects of the present invention are as follows: the cold contained in LNG and the energy and heat released by combustion are fully utilized, wherein the large amount of cold released by LNG gasification is consistent with the cold required by large cold storage, and the LNG obtained after gasification also provides conditions for combustion, and low-grade energy such as waste heat can be fully utilized through the absorption refrigeration cycle, wherein the cold and heat in the absorption refrigeration cycle are respectively used for making ice and heating seawater, which has a great improvement effect over the direct discharge of heat absorbed by high-temperature and high-pressure steam in the traditional absorption refrigeration cycle system, and the cold and heat in the system cycle can be fully utilized, further improving the efficiency of the circulation system, and the natural gas energy is utilized in multiple stages, and the seawater is heated in stages, so that the energy application efficiency is fully improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0019] In the figure: 1-cold storage, 2-throttle valve, 3-flow meter, 4-LNG delivery pipe, 5-first condensing heat exchanger, 6-compressor, 7-internal combustion engine, 10-seawater filtering device, 11-first seawater circulation pump, 12-generator, 13-first seawater heat exchanger, 14-second condensing heat exchanger, 21-second flue gas heat exchanger, 22-second seawater heat exchanger, 23-drying room, 24-drying car, 25-flue gas heat exchanger, 26-fresh water collector, 27-fresh water storage tank, 28-second seawater circulation pump, 29-third seawater circulation pump. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] like Figure 1 As shown, an equipment for making full use of LNG energy includes a cold storage 1, a throttle valve 2, a flow meter 3, an LNG delivery pipe 4, a first condensing heat exchanger 5, a compressor 6, an internal combustion engine 7, a seawater filter 10, a first seawater circulation pump 11, a generator 12, a first seawater heat exchanger 13, a second condensing heat exchanger 14, a second flue gas heat exchanger 21, a second seawater heat exchanger 22, a drying room 23, a drying vehicle 24, a first flue gas heat exchanger 25, a fresh water collector 26, a fresh water storage tank 27, a second seawater circulation pump 28, and a third seawater circulation pump 29.

[0022] Example:

[0023] A device that fully utilizes LNG energy mainly includes a cold storage refrigeration cycle device, an absorption refrigeration cycle device, a seafood drying device and an internal combustion engine 7.

[0024] The cold storage refrigeration cycle device includes a cold storage 1, a throttle valve 2, a flow meter 3, an LNG delivery pipe 4, a first condensing heat exchanger 5 and a compressor 6. The cold storage 1 refrigeration cycle utilizes the cold energy generated by the gasification of LNG to allow a large amount of refrigerant to take away a large amount of heat when passing through the cold storage 1, so that the temperature of the cold storage 1 can be reduced to a very low level, meeting the requirements of large cold energy and quick freezing of seafood in the seafood cold storage 1. The high-temperature and high-pressure refrigerant in the first condensing heat exchanger 5 transfers heat to the LNG delivery pipe 4, so that LNG can be accelerated to gasify, providing a method for LNG gasification. After gasification, LNG can be used for combustion in the internal combustion engine 7, and the internal combustion engine 7 drives the refrigeration cycle through the compressor 6 after combustion.

[0025] The absorption refrigeration cycle device comprises a generator 12, a first seawater heat exchanger 13, a throttle valve 2, a second condensing heat exchanger 14, a seawater filter 10, a seawater circulation pump 11, and a first seawater heat exchanger 13, wherein the seawater filter 10, the seawater circulation pump 11 and the first seawater heat exchanger 13 are all arranged on the seawater delivery pipeline, the purpose of which is to refrigerate the seawater after passing through the first seawater heat exchanger 13 so that the seawater is frozen, and the frozen seawater is separated into ice and water; the absorption refrigeration heat comes from the direct heat of the combustion of the internal combustion engine 7, and the high-temperature and high-pressure refrigerant in the generator 12 is secondary heated by heat exchange when passing through the second condensing heat exchanger 14, and the high-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure liquid after passing through the second condensing heat exchanger 14 and refrigerates the seawater after passing through the first seawater heat exchanger 13 so that the seawater is frozen, and the frozen seawater is separated into ice and water, wherein the ice cubes are used to melt to produce fresh water, and the concentrated seawater is used to produce sea salt.

[0026] The seafood drying device includes a throttle valve 2, a seawater filter device 10, a generator 12, a first seawater heat exchanger 13, a second condensing heat exchanger 14 and a first seawater circulation pump 11. The flue gas after combustion of the internal combustion engine 7 is directly used to heat the seawater that has been heated three times, so that the seawater sprayed to the flue gas heat exchange tube is directly evaporated into water vapor, and the remaining concentrated seawater is discharged through the bottom valve of the first flue gas heat exchanger 25 for the production of sea salt. The evaporated water vapor is used for full heat exchange in the drying car 24 through the drying room 23, so that the temperature in the drying car 24 continues to rise. The high-temperature and high-pressure water vapor outside the drying car 24 is liquefied after heat exchange and collected in the fresh water collector 26 as the produced fresh water. The temperature in the drying car 24 continues to rise, so that the water on the surface of the seafood continues to evaporate. The water vapor evaporated from the seafood passes through the second seawater heat exchanger 22 to heat the seawater for the first time and then condenses and collects in the fresh water storage tank 27 as the produced fresh water.

[0027] Working principle:

[0028] The present invention utilizes the cold energy brought by the gasification of LNG (liquefied natural gas) to drive the refrigeration cycle required by the cold storage. On the one hand, it fully utilizes the cold energy released by its gasification. On the other hand, the gasification of LNG can improve its combustion efficiency and save energy. Furthermore, because seafood needs to be quickly frozen after landing, the cold storage needs to have a large refrigeration capacity. At this time, a refrigerant (such as ammonia refrigerant) can be provided to fully exchange heat with LNG and then liquefy and enter the throttle valve to reduce pressure and throttle before entering the cold storage. At this time, the low-temperature and low-pressure liquid refrigerant is very easy to gasify and obtain a large refrigeration capacity. Further, the combustion of the gasified NG (natural gas) can be used as a power source to drive the refrigeration cycle of the cold storage. Furthermore, the refrigeration cycle system of the cold storage includes a compressor, an evaporator, a throttle valve and a condenser that form a loop in sequence; the internal combustion engine is connected to the compressor and drives it.

[0029] The vaporized LNG is used as fuel for internal combustion engines. The heat from its combustion is directly absorbed and utilized through an absorption refrigeration cycle. The refrigerant in its generator (which can be ammonia refrigerant) evaporates from the solution at a relatively high temperature and pressure. Its high-temperature and high-pressure vapor enters the condensing heat exchanger to further heat the initially heated seawater. The vapor is then liquefied and passes through a throttle valve before entering the evaporating heat exchanger to cool and freeze the initially filtered seawater. After gas-liquid separation, it is melted and used as fresh water. Its concentrated liquid is further processed to produce sea salt.

[0030] The residual smoke from the combustion of the internal combustion engine directly heats the secondary heated seawater, and the secondary heated seawater is directly evaporated into high-temperature and high-pressure water vapor by spraying onto the flue gas heat exchange tube. The water vapor is fully exchanged with the drying car through the drying room. The drying car is continuously heated, and the moisture on the surface of its seafood is continuously evaporated. The water vapor of its seafood is condensed after the initial heat exchange with the seawater and collected in the liquid storage barrel as collected fresh water. The water vapor in the drying room and outside the drying car is cooled to liquid water after continuous heat exchange and collected as fresh water.

[0031] The seawater is pressurized by a circulation pump and then exchanges heat with water vapor for the first time, and then exchanges heat with the second seawater heat exchanger for the second time to further increase the seawater temperature. The seawater passes through the condensing heat exchanger and then exchanges heat with the second flue gas heat exchanger to further increase the seawater temperature. After the seawater exchanges heat with the second flue gas, it is sprayed to the flue gas discharge pipeline of the first flue gas heat exchanger and directly evaporates into high-temperature and high-pressure water vapor. The water vapor is collected and becomes fresh water after heat exchange in the drying room.

Claims

1. A device that fully utilizes LNG energy, characterized in that: It comprises a cold storage refrigeration cycle device, an absorption refrigeration cycle device, a seafood drying device, an LNG delivery pipe (4) and an internal combustion engine (7); after the LNG delivery pipe (4) exchanges heat with the cold storage refrigeration cycle device, the LNG is gasified to provide cooling capacity for the refrigerant, and the gasified LNG is used as the fuel of the internal combustion engine (7) to drive the refrigeration cycle of the cold storage refrigeration cycle device; the direct heat generated by the combustion of the internal combustion engine (7) provides heat for the absorption refrigeration cycle device, and the high-temperature and high-pressure refrigerant exchanges heat with the seafood drying device. After the heat exchange, the refrigerant becomes a low-temperature and low-pressure liquid, and refrigerates the seawater so that the seawater freezes; the flue gas after the combustion of the internal combustion engine (7) provides heat for the seafood drying device, thereby achieving the drying of the seafood; The cold storage refrigeration cycle device comprises a cold storage (1), a throttle valve (2), a flow meter (3), an LNG delivery pipe (4), a first condensing heat exchanger (5), a compressor (6) and a refrigerant circulation pipeline. The cold storage (1), the throttle valve (2), the flow meter (3), the first condensing heat exchanger (5) and the compressor (6) are sequentially arranged on the refrigerant circulation pipeline. The LNG delivery pipe (4) is connected to the first condensing heat exchanger (5). The high-temperature and high-pressure refrigerant in the first condensing heat exchanger (5) transfers heat to the LNG delivery pipe (4), so that the LNG in the LNG delivery pipe (4) is gasified. The gasified LNG is used for combustion in an internal combustion engine (7). The internal combustion engine (7) is connected to the compressor (6) in a transmission manner. After combustion, the internal combustion engine (7) drives the compressor (6) to drive the refrigerant cooling cycle. The absorption refrigeration cycle device comprises a throttle valve (2), a seawater filtering device (10), a generator (12), a first seawater heat exchanger (13), and a second condensing heat exchanger (14).

2. The device for fully utilizing LNG energy according to claim 1, characterized in that: The absorption refrigeration cycle device further comprises a first seawater circulation pump (11), a seawater delivery pipeline and a refrigerant circulation pipeline. The seawater filter device (10) and the first seawater circulation pump (11) are sequentially arranged on the seawater delivery pipeline. The seawater delivery pipeline is connected to the first seawater heat exchanger (13). The generator (12), the second condensing heat exchanger (14) and the first seawater heat exchanger (13) are sequentially arranged on the refrigerant circulation pipeline. The direct heat generated by the combustion of the internal combustion engine (7) provides a heat source for the generator (12). The high-temperature and high-pressure refrigerant in the generator (12) exchanges heat with the seafood drying device when passing through the second condensing heat exchanger (14). After the heat exchange, the refrigerant changes into a low-temperature and low-pressure liquid state and passes through the first seawater heat exchanger (13) to refrigerate the seawater so that the seawater freezes. The frozen seawater is separated into ice and water, wherein the ice is melted to produce fresh water and the concentrated seawater is used to produce sea salt.

3. The device for fully utilizing LNG energy according to claim 2 is characterized in that: The seafood drying device comprises a second flue gas heat exchanger (21), a second seawater heat exchanger (22), a drying room (23), a drying vehicle (24), a first flue gas heat exchanger (25), a fresh water collector (26), a water reservoir (27), a second seawater circulation pump (28), a third seawater circulation pump (29), a seawater spray pipeline and a flue gas discharge pipeline. The first seawater circulation pump (11), the second seawater heat exchanger (22), the second flue gas heat exchanger (21) and the second seawater circulation pump (28) are all arranged on the seawater spray pipeline. The second seawater heat exchanger (22) is arranged on the seawater spray pipeline for secondary heating of the seawater. The drying vehicle (24) is provided with a fresh water collection pipeline. The fresh water collection pipeline is connected to the water reservoir (27) after passing through the second seawater heat exchanger (22). The drying room (23) is provided with a condensed water collection pipeline. The condensed water collection pipeline is connected to the The first flue gas heat exchanger (25) and the second flue gas heat exchanger (21) are connected to each other and are both arranged on the flue gas discharge pipeline. The flue gas after combustion of the internal combustion engine (7) is directly used to heat the seawater, so that the seawater is sprayed onto the flue gas heat exchange pipe and directly evaporates into water vapor. The remaining concentrated seawater is discharged through the bottom valve of the first flue gas heat exchanger (25) for producing sea salt. The water vapor passes through the drying room (23) and is used for sufficient heat exchange in the drying car (24), so that the temperature in the drying car (24) continues to rise. The high-temperature and high-pressure water vapor outside the drying car (24) is liquefied after heat exchange and collected in the fresh water collector (26) as the produced fresh water. The temperature in the drying car (24) continues to rise, so that the water on the surface of the seafood continues to evaporate. The water vapor evaporated from the seafood passes through the second seawater heat exchanger (22) to heat the seawater for the first time and then condenses and collects in the fresh water storage tank (27) as the produced fresh water.

4. A method for using a device that fully utilizes LNG energy according to any one of claims 1 to 3, characterized in that: The steps include: 1) Cold storage refrigeration cycle: LNG in the LNG transmission pipeline exchanges heat with high-temperature and high-pressure refrigerant in the first condensing heat exchanger. The high-temperature and high-pressure refrigerant transfers heat to LNG, which accelerates the gasification of LNG. After gasification, LNG can be used for combustion in internal combustion engines. After combustion in internal combustion engines, the compressor drives the refrigeration cycle. The cold energy generated by LNG gasification allows a large amount of refrigerant to take away a large amount of heat when passing through the cold storage. 2) Drying of seafood surface: The heat of flue gas after combustion in the internal combustion engine causes the outlet of the seawater spraying pipeline to spray seawater to the first flue gas heat exchange tube and directly evaporate into water vapor. The remaining concentrated seawater is discharged through the bottom valve of the flue gas heat exchanger for the production of sea salt. The evaporated water vapor is used for full heat exchange in the drying car through the drying room, so that the temperature inside the drying car continues to rise. The high-temperature and high-pressure water vapor outside the drying car is liquefied after heat exchange and collected through the fresh water collection pipeline to the fresh water collector as the produced fresh water; the temperature inside the drying car continues to rise, so that the water on the surface of the seafood continues to evaporate. The water vapor evaporated from the seafood passes through the second seawater heat exchanger to heat the seawater for the first time, and then condenses through the condensed water collection pipeline to the condensed water fresh water reservoir as the produced fresh water; 3) Absorption refrigeration cycle: The direct heat from the combustion of the internal combustion engine provides a heat source for the generator. The high-temperature and high-pressure refrigerant in the generator passes through the second condensing heat exchanger to secondary heat the seawater in the seawater spray pipeline through heat exchange. The high-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure liquid after passing through the second condensing heat exchanger and cools the seawater from the seawater transmission pipeline after passing through the first seawater heat exchanger to freeze the seawater. The frozen seawater is separated into ice and water, wherein the ice is melted to produce fresh water, and the concentrated seawater is used to produce sea salt.

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