KR102315033B1 - System and Method of Power Generation and Seawater Desalination using Ocean Thermal Energy Conversion on FLNG - Google Patents

Abstract

The present invention relates to a FLNG freshwater production system and method for producing freshwater using a temperature difference of seawater supplied from FLNG to FLNG.
According to the present invention, the step of vaporizing the working fluid in the liquid state of the FLNG by heat exchange with the surface water; producing electrical energy with the vaporized working fluid; liquefying the working fluid that produced the electrical energy; evaporating the surface layer water in which the working fluid is vaporized; and liquefying the vaporized surface water to produce fresh water; wherein the produced fresh water is supplied to a fresh water consumer of FLNG, and at least a portion of the produced fresh water is supplied to a fresh water consumer on land. A method is provided.

Description

{System and Method of Power Generation and Seawater Desalination using Ocean Thermal Energy Conversion on FLNG}

The present invention relates to a FLNG freshwater production system and method for producing freshwater using a temperature difference of seawater supplied from FLNG to FLNG.

Seawater desalination refers to obtaining fresh water by removing salt from seawater so that it can be used as drinking water or industrial water, and there are reverse osmosis, distillation, electrodialysis, and freezing methods.

The desalination of seawater has advantages in that a large amount of water resources can be stably secured, and the plant is compact and the facility area is small.

In this desalination market, the need for technology to desalinate saltwater such as seawater is increasing in many regions of the world where freshwater supply is insufficient due to global water shortages due to climate change and population increase, and water pollution due to industrial development. The various desalination methods that have been developed are in need of many improvements, such as desalination efficiency and energy saving.

For example, in the case of a desalination method using an evaporation process, since a large amount of water vapor must be evaporated at a high speed, a lot of energy is required and the operation cost is high. The reverse osmosis method has a disadvantage in that energy efficiency is poor because high pressure must be generated using a high-pressure pump, and it is not particularly suitable for ships that can work in the sea.

On the other hand, the consumption of electric energy on land is continuously increasing due to its ease of use and stable price. Since the 2000s, the energy supply and demand conditions have changed rapidly due to the continuous rise in oil prices, and the demand for electricity has also been continuously increasing due to the influence of complex factors such as conversion demand due to the relative price difference between energy sources.

On the other hand, it is difficult to expand power supply facilities and secure stable supply and demand due to problems such as difficulties in securing a construction site for the construction of power plants and transmission infrastructure and increasing complaints from local residents.

In addition, floating structures such as LNG-FPSO (hereinafter referred to as "FLNG"), which are equipped with various plant facilities such as drilling, processing, production, and unloading of natural gas from a subsea gas field, floating on the sea, and large ships are in operation during operation. It is also equipped with a power generation system that generates the necessary electricity. In general, ships require a large amount of electrical energy, and power generation systems for generating electrical energy usually use fossil fuels as raw materials. In Korea, it is necessary to develop eco-friendly ships with increased energy efficiency and reduced environmental pollution by reducing the use of fossil fuels.

Republic of Korea Patent Publication No. 10-1022745 (Registered on March 9, 2011) Republic of Korea Patent Publication No. 10-1236070 (Registered on February 15, 2013)

Accordingly, the present invention is to desalinate seawater while simultaneously producing electric energy of FLNG as an alternative energy to fossil fuels.

In other words, by transmitting electric energy produced by FLNG to land, it is possible to solve the instability of power supply and demand on land, to reduce the operating cost of FLNG, and to minimize pollution of the marine environment caused by using seawater to produce electric energy. At the same time, the purpose is to provide a freshwater production system and production method for FLNG that can supply freshwater to freshwater shortage areas.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems to be solved by the present invention not mentioned here will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, vaporizing the working fluid in the liquid state of the FLNG by heat exchange with the surface water; producing electrical energy with the vaporized working fluid; liquefying the working fluid producing the electrical energy; evaporating the surface layer water in which the working fluid is vaporized; and liquefying the vaporized surface water to produce fresh water; wherein the produced fresh water is supplied to a fresh water demander of FLNG, and at least a part of the produced fresh water is supplied to a freshwater demand on land. A method is provided.

Preferably, in the step of liquefying the working fluid, the deep water of seawater and the working fluid are heat exchanged, and in the step of liquefying the vaporized surface water to produce fresh water, the deep water in which the working fluid is liquefied and the surface water in a gaseous state are heat exchanged. can do it

Preferably, the electrical energy produced by using the seawater temperature difference power generation is FLNG including a pump, an electric heater, an amine absorption tower, a compressor, an expander, and a compressor of a liquefaction process refrigerant cycle of a pretreatment process, an evaporator, an expansion valve, and a heat exchanger It can be supplied as a topside facility and utility facility of

Preferably, at least a portion of the electrical energy produced by the FLNG using a temperature difference of seawater may be transmitted to the onshore power plant using a power transmission infrastructure of an onshore power plant provided on the shore of the coast.

According to another aspect of the present invention, in order to produce fresh water using the temperature difference of seawater in FLNG, a seawater evaporator for evaporating seawater; a seawater condenser for condensing the seawater vaporized in the seawater evaporator; and a working fluid evaporator for vaporizing the working fluid in a liquid state by heat-exchanging it with the surface water of seawater, wherein the seawater supplied to the seawater evaporator is surface water of seawater discharged after heat exchange in the working fluid evaporator. this is provided

Preferably, the fresh water liquefied in the seawater condenser may be supplied from the FLNG to a fresh water demand on land.

Preferably, the FLNG may generate electric energy using a temperature difference of seawater, and the electric energy produced by using the temperature difference of the seawater may be used as power of the FLNG.

Preferably, the FLNG is provided on the shore of the coast, the onshore power plant provided on the shore of the coast and equipped with an onshore infrastructure; further comprising a; A part of it can be transmitted to a demand on land using the transmission infrastructure.

Preferably, in order to produce electrical energy by using the temperature difference of seawater in the FLNG, a generator for generating electrical energy by operating a turbine by the working fluid vaporized in the working fluid evaporator; and a working fluid condenser for liquefying the gaseous working fluid that operated the turbine; and a deep water supply line for supplying deep water of seawater to exchange heat with the working fluid in the working fluid condenser; Including, the turbine The working gaseous working fluid may be liquefied by heat exchange with deep water of seawater in the working fluid condenser, and the liquefied working fluid may be re-supplied to the working fluid evaporator to form a closed cycle.

Preferably, fresh water can be produced by exchanging gaseous seawater in the seawater condenser with the working fluid in the working fluid condenser and then exchanging heat with the deep water discharged.

According to another aspect of the present invention, in order to produce fresh water using the temperature difference of seawater in FLNG, a surface water evaporator for evaporating and vaporizing surface water of seawater; a generator for generating electrical energy by operating a turbine using the gaseous surface water vaporized in the surface water evaporator; and a working fluid condenser for liquefying the gaseous surface water that operates the turbine in the generator by exchanging heat with the deep water of seawater, and supplies the fresh water liquefied and discharged from the working fluid condenser to a freshwater demander on land, and the production There is provided a FLNG freshwater production system that uses the electric energy as power for the FLNG.

According to the present invention, freshwater is produced from FLNG floating in the sea off the coast, and freshwater is supplied in regions suffering from water shortage problems such as Africa, and freshwater is supplied at 1/10 of the cost of existing facilities by providing it to a FLNG vessel. can produce

In addition, by using the characteristics of FLNG floating for a long time in the vicinity of one offshore gas field, by producing electric energy using seawater as a raw material, both heat and cooling heat can be obtained from the sea, so a separate heat source and turbine for power generation can be provided. As there is no need, the operating cost of FLNG can be reduced.

In addition, electric energy produced by FLNG can be transmitted to land by using the characteristics of FLNG floating in the sea off the coast. Therefore, it is relatively free from problems such as securing a site for the construction of an onshore power plant, and while shortening the plant construction time, it is possible to stabilize the onshore power supply and demand, and to maintain the economy of scale by generating the difference in seawater temperature.

In addition, by providing a seawater temperature difference power generation system in the FLNG, mobility is provided, and relatively stable seawater can be used as an energy source without change of day and night.

1 is a block diagram illustrating a FLNG freshwater production system according to a first embodiment of the present invention.
2 is a block diagram showing the FLNG and freshwater production system provided with the freshwater production system according to the first embodiment of the present invention.
3 is a block diagram of a freshwater production system for FLNG according to a second embodiment of the present invention.
4 is a block diagram of a FLNG freshwater production system according to a third embodiment of the present invention.

In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference signs to the elements of each drawing, it should be noted that only the same elements are indicated by the same reference signs as possible even if they are indicated on different drawings. In addition, the following examples may be modified in various other forms, and the scope of the present invention is not limited to the following examples.

The FLNG freshwater production system and method according to the present invention are provided in FLNG, an offshore floating structure that drills natural gas buried in a seabed gas field, floats on the sea, and processes, produces and unloads natural gas, and the temperature difference of seawater It is characterized in that it produces electrical energy using the FLNG and desalinates this seawater to produce fresh water. It is used for power required for various plant facilities in FLNG such as production and unloading. In addition, the produced freshwater is supplied to FLNG's freshwater demanders or onshore freshwater consumers.

Hereinafter, FLNG includes a ship body or structure itself of an FLNG equipped with various plant equipment as described above. Although it can be applied to offshore structures to be mounted, it is preferable to float in the sea of nearshore where freshwater storage facilities and freshwater supply infrastructure or transmission infrastructure such as onshore plants or onshore power plants and transmission terminals are provided. .

FIG. 1 shows a FLNG freshwater production system according to a first embodiment of the present invention, and FIG. 2 shows a FLNG freshwater production system and a FLNG equipped with a freshwater production system according to the first embodiment of the present invention. Hereinafter, it will be described with reference to FIGS. 1 and 2 .

1 and 2, the FLNG freshwater production system of the first embodiment according to the present invention uses the temperature difference of seawater in the FLNG 1 to produce electrical energy and at the same time produce fresh water. , the working fluid evaporator 100 that vaporizes the working fluid in the liquid state, the turbine 110 operating by the working fluid vaporized in the working fluid evaporator 100, and the kinetic energy generated in the turbine 110 by the working fluid and a generator 111 for generating electrical energy.

In addition, a working fluid condenser 120 for liquefying the gaseous working fluid after generating kinetic energy by operating the turbine 110 is further included, and the working fluid in the liquid state liquefied in the working fluid condenser 120 is pumped After being compressed through 140 and compensated for the pressure, the working fluid is supplied to the evaporator 100 again and vaporized.

Accordingly, the working fluid circulates in a closed cycle composed of the working fluid evaporator 100 , the turbine 110 , the working fluid condenser 120 , and the pump 140 . At the rear end of the pump 140 , a valve for controlling the flow rate of the working fluid in the liquid state supplied to the working fluid evaporator 100 may be further included.

That is, the working fluid is evaporated by heat exchange in the working fluid evaporator 100 , and the evaporated working fluid is sent to the turbine 110 to generate power, and the steam discharged from the turbine 110 exchanges heat in the working fluid condenser 120 . It is liquefied and recycled again.

The working fluid evaporator 100 may be a heat exchanger, and the working fluid in a liquid state supplied to the working fluid evaporator 100 is vaporized by heat exchange in the working fluid evaporator 100 , and the working fluid is seawater in the working fluid evaporator 100 . It is vaporized by heat exchange with the surface water of

The surface water of the seawater supplied to the working fluid evaporator 100 is withdrawn within about 100 m below the sea level of the outboard ocean, is supplied to the FLNG through the surface water intake 130 of the FLNG, and is operated through the surface water supply line 131 It may be supplied to the fluid evaporator 100 .

In addition, the heating medium for vaporizing the working fluid in the working fluid evaporator 100 is the cooling water that cools the nuclear reactor in the onshore power plant 2 or the hot wastewater discharged from the onshore power plant 2 such as the refrigerant after cooling the coolant. may have been supplied through a pipeline. In this way, since it is not necessary to separately provide a cooling heat source for cooling the hot wastewater in the onshore power plant 2 , the operating cost of the onshore power plant 2 can be reduced.

After operating the turbine 110 and delivering kinetic energy to the turbine 110, the working fluid is supplied to the working fluid condenser 120, and the working fluid supplied to the working fluid condenser 120 is in a gaseous state, or with gas It may be in a mixed state of a liquid, and hereinafter, it will be described as a gaseous working fluid for convenience.

The working fluid in the gaseous state supplied to the working fluid condenser 120 is liquefied by heat exchange with the deep water of the seawater in the working fluid condenser 120 .

The deep water of the seawater supplied to the working fluid condenser 120 is withdrawn within about 1,000 m below the sea level of the outboard ocean, and is supplied to the FLNG through the deep water intake unit 132 of the FLNG, and through the deep water supply line 133 The working fluid may be supplied to the condenser 120 .

Deep water withdrawal from the deep seabed can be accomplished through a pipe that can transport low-temperature deep water from the seabed to the FLNG.

Some of the solar energy is stored as heat in seawater up to 100m above the surface of the ocean, and in low latitudes, it is maintained at around 26°C to 30°C throughout the year. The minimum surface temperature is -2℃. The seawater cooled in the polar regions moves to low latitudes according to the ocean circulation, and as it moves, a temperature difference occurs between the surrounding seawater, so that cold seawater in the polar regions with relatively high density sinks to the depths. The depth water of about 1°C to 7°C between the surface water and the deep water 600m to 1,000m is taken, and electric energy is produced in the FLNG using the temperature difference as described above.

Seawater temperature difference energy is a relatively stable energy source without change of day and night, and since seasonal fluctuations are predictable, it can be used as a basic power source to generate electricity. The temperature difference between the surface and deep waters of the world's oceans averages about 16 to 24 degrees Celsius, and is particularly high at 24 degrees Celsius near the equator. In order for seawater temperature difference power generation to have economic feasibility as an alternative energy, it is ideal to have a temperature difference of about 20°C. , Japan, the East Sea, southern Australia, Mexico, Brazil, etc., it is desirable to carry out in regions with abundant temperature differences.

As described above, the working fluid in a liquid state in the working fluid evaporator 100 is vaporized by heat exchange with surface water at about 18° C. to 30° C., and is liquefied by heat exchange with deep water at about 5° C. in the working fluid condenser 120. Therefore, the working fluid is ammonia (NH ₃ ), CFC, HCFC, R22, R1270 (propylene), R290 (propane), R407, R407C, R32, a low-boiling organic refrigerant such as R134a.

Electrical energy produced by the generator 111 by the working fluid vaporized by heat exchange in the working fluid evaporator 100 is supplied to electric energy demanders such as topside facilities of FLNG and used as power. For example, various pumps, electric heaters, absorption/regeneration towers (especially absorption towers and regeneration towers for amine absorption processes) in the pretreatment process of FLNG including acid gas removal process, water removal process, mercury removal process and water treatment process; It is supplied to various topside facilities, utility facilities, residences, etc. of FLNG, including compressors, expanders, etc., and liquefaction processes, in particular, compressors, evaporators, expansion valves, and heat exchangers of the refrigerant cycle.

Therefore, since it is not necessary to additionally provide a gas turbine and an engine for power generation provided for power generation in the conventional FLNG, the CAPEX of the FLNG can be significantly reduced.

Part of the electrical energy produced by the generator 111 by the working fluid vaporized in the working fluid evaporator 100 may be transmitted to the onshore power plant 2 provided on the shore of the coast where the FLNG is floating. In this case, the onshore power transmission infrastructure provided in the onshore power plant 2 may be used, and the onshore power plant 2 may be used as electric power of the onshore power plant 2 or may be transmitted to a demand on land.

In addition, in the first embodiment of the present invention, in order to produce fresh water using the temperature difference of seawater, a seawater evaporator 200 for evaporating seawater, a seawater condenser 210 for condensing the seawater vaporized in the seawater evaporator. include more

The seawater evaporated in the seawater evaporator 200, that is, a source for producing fresh water is surface layer water of seawater heated by heat exchange with the working fluid in the working fluid evaporator 100 to vaporize the working fluid. Therefore, compared to the existing system having only desalination facilities, energy costs and installation costs can be reduced.

The seawater vaporized in the seawater evaporator 200 is supplied to the seawater condenser 210 to be liquefied again to produce fresh water. At this time, the seawater in the seawater condenser 210 exchanges heat with the working fluid in the working fluid condenser 120 to liquefy the working fluid. do.

The fresh water produced by the seawater condenser 210 may be supplied to a fresh water demand of the FLNG 1 , for example, fresh water for cooling required for a FLNG pretreatment process, a liquefaction process, and fresh water for cooling of an engine room. Alternatively, by connecting a water supply pipe to the shore of the shore where the FLNG 1 is floating, it may be supplied to the industrial or household desalination demand 220 using a water resource intake and supply infrastructure such as a fresh water tank provided on the shore.

For example, the FLNG (1) is floating on the coast of Africa or the Middle East, and fresh water produced using the FLNG freshwater production system can be supplied to land in Africa or the Middle East, and at the same time, the produced electrical energy can also be supplied. As a result, it is possible to produce and supply electric energy and fresh water efficiently and at low cost to Africa and the Middle East, where freshwater and electric energy are scarce and it is not easy to construct a plant on land. Economies of scale can be maintained by moving regions along the way and supplying freshwater and electrical energy to land in the same way.

3 shows a freshwater production system for FLNG according to a second embodiment of the present invention. Hereinafter, it will be described with reference to FIG. 3, and the same or similar configuration or operation as described in the first embodiment is applied in the same manner as in the first embodiment, and thus a description thereof will be omitted.

As shown in FIG. 3 , the second embodiment of the FLNG freshwater production system and method of the present invention is provided in the FLNG as in the first embodiment, and uses the temperature difference of seawater to produce electrical energy, and the generated electricity Energy is supplied by FLNG power, and a portion of the generated electrical energy can be transmitted to a land-based power plant or to a demand on land using the power transmission infrastructure of the land-based power plant.

In the second embodiment of the present invention, the working fluid evaporator 100 that vaporizes the working fluid as in the first embodiment, in order to produce electrical energy and fresh water at the same time as using the temperature difference of seawater in the FLNG, the working fluid A deep water intake unit 130 and deep water supply that forms a closed cycle including the condenser 120 and the turbine 110 and the generator 111, and supplies deep water of seawater to liquefy the working fluid in the working fluid condenser 120 line 131 .

In the second embodiment of the present invention, the heat source supplied to vaporize the working fluid in the working fluid evaporator 100 may be surface water of seawater. After being supplied to the surface water evaporator 102 through 133), it may be vaporized in the surface water evaporator 102 and supplied to the working fluid evaporator 100 in a gaseous state.

Therefore, in the second embodiment, in the working fluid evaporator 100, in order to operate the turbine 111 to produce electrical energy, the liquid working fluid is vaporized by heat exchange with the gaseous surface water, and then in the gaseous state. of the working fluid is supplied to the turbine 111 .

In addition, the second embodiment further includes a seawater condenser 210 for producing fresh water by liquefying the gaseous surface water obtained by heat exchange with the working fluid to vaporize the working fluid. In the seawater condenser 210, the working fluid condenser 120 operates the turbine 111 to produce electrical energy, and then receives the deep water liquefied working fluid, and heat-exchanges with the surface water in the gaseous state to form a gaseous state liquefy the surface water of

The freshwater produced by liquefying the gaseous surface water in the seawater condenser 210 is supplied to the above-mentioned FLNG freshwater demander or land freshwater demander.

4 shows a freshwater production system for FLNG according to a fourth embodiment of the present invention. Hereinafter, it will be described with reference to FIG. 4, and the same or similar configuration or operation as described in the first embodiment is applied in the same manner as in the first embodiment, and thus a description thereof will be omitted.

In the fourth embodiment of the present invention, the working fluid for operating the turbine 110 to transmit kinetic energy to the generator 111 may be surface water in a gaseous state.

That is, the surface water taken from the outboard sea of the FLNG through the surface water intake unit 132 is supplied to the surface water evaporator 102 through the surface water supply line 133, and the surface water in the gaseous state vaporized in the surface water evaporator 102 is It is supplied to the turbine 100, and surface water in a gaseous state or a mixture of gas and liquid discharged from the turbine 100 after operating the turbine 100 is supplied to the working fluid condenser 120, and the working fluid condenser 120 ) forms an open cycle where it is liquefied and discharged.

The cooling heat source for liquefying the working fluid, that is, the surface water of seawater in the working fluid condenser 120 may be deep water of seawater taken into the deep water intake unit 130 of the FLNG, and the working fluid condenser ( 120), and after operating the turbine 100 in the working fluid condenser 120, heat exchange with the gaseous surface water supplied to the working fluid condenser 120 is discharged and then discharged.

Similarly in the fourth embodiment of the present invention, the electric energy produced by using the temperature difference of seawater in the FLNG according to the fourth embodiment is used as the electric power of the FLNG, and a part of the produced electric energy is provided on land by an onshore power plant. Power can be transmitted to a demand on land by using the power transmission infrastructure of a furnace or an onshore power plant. In addition, the freshwater produced at the same time may be supplied to the above-described FLNG freshwater demander or land freshwater demander 220 .

According to the third and fourth embodiments, after the surface water is vaporized in the surface water evaporator 102, it is liquefied in the working fluid condenser 120 and discharged in a liquid state, so that fresh water that has undergone evaporation and condensation is produced, At this time, the fresh water can be supplied to FLNG or to a fresh water demand on land.

The onshore power plant 2 in the above-described embodiments of the present invention may include a nuclear power plant, a thermal power plant (including combined thermal power generation), a wind power plant, and a tidal power plant, and in particular, FLNG in the coast near the pre-selected nuclear power plant. If (1) is provided, the infrastructure of the nuclear power plant can be utilized. Since the infrastructure of the onshore power plant (2), especially the transmission infrastructure, can be utilized even in the case of a shutdown of the onshore power plant (2) or insufficient power production, power generation from the offshore FLNG (1) is generated by the existing onshore power plant (2) Electric energy can be transmitted to power demanders by utilizing the infrastructure of

In addition, in the embodiment of the present invention described above, since the temperature difference power generation system and the freshwater production system using seawater are provided in the FLNG, it has mobility, so that it can be moved to another place if necessary.

As described above, according to an embodiment of the present invention, the present invention includes the steps of vaporizing the working fluid in the liquid state of the FLNG by heat exchange with the surface water, producing electric energy with the vaporized working fluid, and the operation of producing the electric energy A step of liquefying the fluid, evaporating the surface water obtained by vaporizing the working fluid, and liquefying the vaporized surface water to produce fresh water, wherein the produced fresh water is used in any of FLNG freshwater consumers or onshore consumers. Provides a method for freshwater production of FLNG that is supplied to more than one site.

In the step of liquefying the working fluid, the deep water of seawater and the working fluid are heat exchanged, and in the step of liquefying the vaporized surface water to produce fresh water, the deep water in which the working fluid is liquefied and the gaseous surface water are heat exchanged to produce fresh water. do.

As described above, the embodiments according to the present invention have been described, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention other than the above-described embodiments can be seen by those with ordinary skill in the art. It is self-evident to Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

1: FLNG
2: Onshore power plant
3: Onshore freshwater demand
100: working fluid evaporator
102: surface water evaporator
110: turbine
111: generator
120: working fluid condenser
130: deep water intake unit
131: deep water supply line
132: surface water intake part
133: surface water supply line
140: pump
200: sea water evaporator
210: seawater condenser
220: fresh water demand

Claims (11)

generating electrical energy using a working fluid and surface water;
Producing fresh water using the surface water and deep water: including,
The electrical energy production step is,
vaporizing the working fluid in the liquid state of the FLNG by heat-exchanging it with surface water;
producing electrical energy with the vaporized working fluid;
and liquefying the working fluid that produced the electrical energy by heat exchange with deep water, characterized in that it comprises a closed cycle by re-vaporizing the liquefied working fluid,
The freshwater production step is,
evaporating the surface layer water in which the working fluid is vaporized; and
The vaporized surface water is heat-exchanged with the deep water in which the working fluid is liquefied to produce fresh water;
The deep water is characterized in that it is supplied as one supply line in the previous step,
The produced fresh water is supplied to a freshwater demand of the FLNG, and at least a portion of the produced fresh water is supplied to a freshwater demand on land. delete The method according to claim 1,
The produced electrical energy is supplied to FLNG topside facilities and utility facilities including pumps, electric heaters, amine absorption towers, compressors, expanders, compressors, evaporators, expansion valves, and heat exchangers of the liquefaction process refrigerant cycle in the pretreatment process. Power generation and freshwater production methods. 4. The method according to claim 3,
At least some of the electrical energy produced is
A method for power generation and freshwater production of FLNG in which power is transmitted to the onshore power plant by using the power transmission infrastructure of the onshore power plant provided on the shore of the coast. Including power generation unit, fresh water production unit and cooling and heat supply unit,
The power generation unit,
a working fluid evaporator for vaporizing a liquid working fluid by heat exchange with surface water;
a generator for generating electrical energy by operating a turbine with a gaseous working fluid; and
Including: a working fluid condenser for liquefying the gaseous working fluid;
The liquid working fluid is re-supplied to the working fluid evaporator to form a closed cycle,
The freshwater production department,
a seawater evaporator for evaporating the surface water discharged after heat exchange in the working fluid evaporator; and
Including: a seawater condenser for condensing the seawater vaporized in the seawater evaporator,
The cooling and heat supply unit,
It consists of one deep water supply line,
After liquefying the gaseous working fluid by supplying cooling heat from the working fluid condenser, cooling heat is supplied from the seawater condenser to condense the vaporized seawater, re-supplying the working fluid in the liquid phase and producing fresh water Power generation and desalination of FLNG production system. 6. The method of claim 5,
FLNG power generation and freshwater production system, which supplies the freshwater produced in the seawater condenser to FLNG or onshore desalination demand and uses the electric energy produced in the power generation unit as the power of the FLNG. delete 6. The method of claim 5,
The FLNG is provided in the sea off the coast,
A land power plant provided on the shore of the coast and equipped with a power transmission infrastructure; further including,
FLNG power generation and freshwater production system for transmitting at least a portion of the electric energy produced by the FLNG using the temperature difference of seawater to a demand on land using the power transmission infrastructure. delete delete delete

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