KR20240025519A - Method for producing electricity by equipment intended to be placed in bodies of water - Google Patents

Abstract

The invention relates to a method for producing electricity by means of an installation (10) comprising: a floating storage unit (16) comprising a main tank (28) for storing liquefied natural gas; a floating regasification and electricity production unit (18) comprising a regasification module (30) and an electricity production module (32); - a transfer unit 20 for transferring liquefied natural gas between the two units 16, 18. The production method includes the following steps: - transfer from the main tank 28 via the transfer unit 20 to the regasification and electricity production unit 18; - Regasification of liquefied natural gas by means of the regasification module 30; - delivery of gas from the regasification module 30 to the electricity production module 32; - Production of electricity by the electricity production module 32.

Description

Method for producing electricity by equipment intended to be placed in bodies of water

The invention relates to a method for producing electricity by an installation intended to be placed in a body of water.

In particular, this installation can accommodate liquefied natural gas (commonly referred to by the acronym "LNG") and produce electrical energy from this liquefied natural gas - once the latter has been regasified.

This natural gas is produced from reservoirs located under water bodies or on land, and is then liquefied and transported to facilities.

Several methods are known for producing electricity from liquefied natural gas.

Conventionally, terminals for receiving liquefied natural gas are installed on receiving piers. LNG carriers deliver liquefied natural gas, which is stored in storage tanks and then regasified. Some of the gas produced is then used by gas-fired power plants to produce electricity that is distributed across the power grid.

It is also known to use floating storage and regasification units (referred to by the acronym “FSRU”) to receive liquefied natural gas from LNG carriers. The liquefied natural gas is then temporarily stored in the FSRU and returned to gaseous form before being subsequently sent to an onshore gas-fired power plant.

Alternatively, the gas produced by the FSRU is sent to a floating barge that receives the gas and then produces electrical energy. Such a solution allows for flexible and mobile electricity production compared to land-based power plants. Therefore, such solutions make it possible to electrify certain areas quickly and with reduced investment amounts.

However, FSRUs are new vessels, or former LNG carriers converted to FSRUs. The cost of FSRUs represents a very large percentage of the cost of such electricity production projects. As an example, the cost of a newly built FSRU often exceeds 200 million euros. In the case of the previous use of LNG carriers, this makes it possible to achieve some savings, but the cost of converting them to FSRUs is still around 100 million euros, as significant modifications to the LNG carriers are required.

It is also known to use a fully integrated floating storage, regasification and power generation barge (referred to by the acronym "FSRP"). This fully integrated design makes it possible to combine storage and regasification functions with power generation functions on a single floating object, providing operational flexibility and rapid deployment. However, the complexity and cost of design and construction of such structures are detrimental to their competitiveness.

Accordingly, one object of the present invention is to provide a method of producing electricity with reduced design and installation costs while maintaining the flexibility of storage of liquefied natural gas and production of electricity in the water.

To this end, the invention relates to a method for producing electricity by an installation intended to be placed in a body of water, the installation comprising:

- a floating storage unit, comprising an internal volume having a main tank for storing liquefied natural gas;

- a floating regasification and electricity production unit separate from the storage unit, said regasification and electricity production unit comprising a regasification module and an electricity production module;

- Unit for transferring liquefied natural gas between the storage unit and the regasification and electricity production unit.

Including,

The production method involves at least the following steps:

- delivering liquefied natural gas from the main tank of the storage unit through the delivery unit to the regasification and electricity production unit;

- Regasifying liquefied natural gas into gaseous gas by means of a regasification module;

- delivering gas from the regasification module to the electricity production module;

-Producing electricity from gas by an electricity production module

Includes.

The method for producing electricity according to the invention may comprise one or more of the following features, considered alone or in any technically feasible combination:

- The method further comprises the step of delivering liquefied natural gas from the LNG carrier to the main tank of the storage unit;

- the delivery unit supplies liquefied natural gas directly to the regasification module, advantageously at a flow rate of between 10 m ³ /h and 500 m ³ /h;

- the regasification and electricity production unit further comprises a buffer tank with a smaller capacity than the main tank, the delivery unit buffering the liquefied natural gas, advantageously with a flow rate of 500 m ³ /h to 3000 m ³ /h. to the tank, and the liquefied natural gas is then transferred from the buffer tank to the regasification module;

- The storage unit and regasification unit are moored on a common pier connected to a dock on land;

- Storage units and regasification and electricity production units are arranged along the pier on both sides of the pier;

- the storage unit is moored to at least one floating buoy fixed to the bottom of the water body, and the regasification and electricity production units are moored along with the storage unit;

- the storage unit is moored by at least one fixed line fixed to the bottom of the water body, and the regasification and electricity production units are moored along the storage unit;

- the delivery unit comprises ducts arranged on the pier for transferring liquefied natural gas from the storage unit to the regasification and electricity production unit;

- the delivery unit comprises ducts directly connecting the storage unit and the regasification and electricity production unit to transfer liquefied natural gas directly from the storage unit to the regasification and electricity production unit;

- Ducts are articulated rigid pipes and/or cryogenic flexible pipes;

- The electricity production module comprises electricity production means selected from the group consisting of:

- gas engine,

- Dual-fuel engines of gas-diesel or gas-fuel oil,

- Open-cycle gas turbine,

- open-cycle dual-fuel turbines on gas-diesel or gas-fuel oil,

- Combined-cycle gas turbines and steam turbines,

- Combined-cycle dual fuel, gas-diesel or gas-fuel oil, and steam turbines;

- The electricity production modules are combined-cycle turbines, and the regasification and electricity production unit is arranged between the regasification module and the electricity production module for heating liquefied natural gas and condensing the steam at the outlet of the combined cycle steam turbine. 1 Contains heat exchanger;

- the regasification and electricity production unit comprises a second heat exchanger arranged between the regasification module for heating the liquefied natural gas and the electricity production module for cooling the intake air into the engine or gas turbine;

- the electricity production module is at least one combined-cycle gas turbine and a steam turbine, the electricity production module comprising a condenser that takes water from the water body to condense the steam at the outlet of the steam turbine, and at the outlet of the condenser before discharge into the water body. At least one wet cooling tower for cooling water; and

- The regasification and electricity production unit comprises a system for measuring the liquefied natural gas circulating at the inlet of the regasification module and/or the gas circulating at the outlet of the regasification module.

The invention is given by way of example only and will be better understood upon reading the following description made with reference to the accompanying drawings.
- Figure 1 is a plan view of the equipment according to the present invention.
- Fig. 2 is a plan view of a variant of the equipment of Fig. 1;
- Figure 3 is a plan view of another variant of the equipment of Figure 1;
- Fig. 4 is a plan view of another variant of the equipment of Fig. 1;
- Figure 5 is a schematic diagram of the regasification and electricity production unit of the plant of Figure 1;
- Figure 6 is a partial schematic diagram of a variant of the regasification and electricity production unit of Figure 5;
- Figure 7 is a partial schematic diagram of another variant of the regasification and electricity production unit of Figure 5;

Hereinafter, “liquefied natural gas” is understood to mean natural gas from which water, heavy compounds (eg C6+ compounds) and sulfur compounds have been partially extracted and then condensed into a liquid state. Liquefied natural gas consists essentially of methane, but also of ethane, propane, and butane, among others. Methane becomes a liquid at a temperature of -161°C at atmospheric pressure and takes the form of a transparent, permeable, odorless, non-corrosive and non-toxic liquid. In this form, liquefied natural gas has a density about 600 times greater than that of the gas under normal temperature and pressure conditions.

“Gas” is understood to mean natural gas in the gaseous state, especially after regasification of liquefied natural gas.

In the following, the terms “upstream” and “downstream” are understood to refer to the normal circulation direction of flow in the duct.

Equipment 10 is shown in Figures 1-4.

The installation 10 is intended to be placed on a body of water 12 .

The body of water 12 is for example a lake, sea or ocean. The depth of the water body 12 immediately below the installation 10 is for example between 5 m and 3000 m.

The facility 10 is configured to produce electricity and supply it to the power grid, to onshore infrastructure 14 such as a factory as illustrated in Figure 1, or alternatively to offshore infrastructure such as an oil platform.

Here the equipment 10 supplies the land infrastructure 14 via electrical lines 15.

The facility 10 includes a storage unit 16 , a regasification and electricity production unit 18 and a transfer unit 20 between the storage unit 16 and the regasification and electricity production unit 18 .

As can be seen in Figures 1 and 2, the storage unit 16 and the regasification unit are moored at a common pier 22 connected to a dock 24 onshore.

The pier 22 is a rigid, constructed structure that protrudes from the dock 24 on land into the water body 12. The land dock 24 is a road provided at the edge of the water body 12, for example in a port.

In the example of FIG. 1 , the storage unit 16 and the regasification and electricity production unit 18 are arranged along the pier 22 on both sides of the pier 22 .

In a variant, in the example of FIG. 2 , the storage unit 16 and the regasification and electricity production unit 18 are arranged along the pier 22 on the same side of the pier 22 . At this time, the storage unit 16 and the regasification and electricity production unit 18 are arranged in a row, ie front to back.

In another variation, as illustrated in FIG. 3 , the equipment 10 is not moored to the pier 22 . The storage unit 16 is moored to at least one floating buoy 26 , in this case three floating buoys 26 . Each floating buoy 26 is anchored to the bottom of the water body 12. The regasification and electricity production unit 18 is moored along with the storage unit 16 .

In another variant, as illustrated in FIG. 4 , the storage unit 16 is secured by at least one fixed line 27 , in this case three fixed lines 27 , fixed directly to the bottom of the water body 12 . It is pending. The regasification and electricity production unit 18 is moored along with the storage unit 16 .

The storage unit 16 and the regasification and electricity production unit 18 are units floating on the water body 12 . In particular, they have a floating hull on top of which a plurality of interconnected equipment is arranged.

The storage unit 16 and the regasification and electricity production unit 18 are separate from each other. In other words, the storage unit 16 and the regasification and electricity production unit 18 each comprise their own floating hull and can move over the body of water 12 independently of one another when they are not moored to each other.

The storage unit 16 comprises a floating hull 17 defining an internal volume, which itself contains at least one liquefied natural gas storage tank 28 .

In the embodiment shown in the figures, three tanks 29a, 29b, 29c are fluidly connected to each other.

As can be seen in Figure 1, the main tank 28 is transported by an LNG carrier 31 (also referred to as a liquefied natural gas or LNG tanker) sailing above the water body 12 and moored along with the storage unit 16. Liquefied natural gas can be supplied.

The main tank 28 can store a quantity of liquefied natural gas ranging from 5000 m ³ to 300,000 m ³ .

The regasification and electricity production unit 18 includes a regasification module 30 and an electricity production module 32 .

The exemplary facility 10 of FIG. 1 does not have a liquefied natural gas storage tank, with liquefied natural gas delivered directly to the regasification module 30 from the main tank 28 of the storage unit 16.

In the variant shown in Figure 2, the regasification and electricity production unit 18 further comprises a buffer tank 33 capable of storing liquefied natural gas.

The buffer tank 33 has a storage capacity smaller than that of the main tank 28.

In particular, the buffer tank 33 can store an amount of liquefied natural gas of 500 m ³ to 30,000 m ³ .

The regasification module 30 is configured to convert liquefied natural gas into a gaseous state to obtain the gas again.

The regasification module 30 is a portion of the liquefied natural gas that makes it possible to supply the necessary heat for the evaporation of the liquefied natural gas or by heat exchange with the surrounding air and/or with water coming from the water body 12 and evaporators configured to boil the liquefied natural gas by combustion of.

The regasification module 30 is configured to deliver the gas so produced to the electricity production module 32 .

The floating regasification and electricity production unit 18 advantageously comprises a system for measuring the liquefied natural gas circulating at the inlet of the regasification module 30 and/or the gas circulating at the outlet of the regasification module 30. Includes more.

The electricity production module 32 is configured to produce electricity from supplied gas. In particular, the electricity production module 32 is configured to produce between 15 MW and 1500 MW of electricity.

The electricity production module 32 comprises electricity production means selected from the group consisting of:

- gas engine,

- Dual-fuel engines of gas-diesel or gas-fuel oil,

- Open-cycle gas turbine,

- open-cycle dual-fuel turbines on gas-diesel or gas-fuel oil,

- Combined-cycle gas turbines and steam turbines,

- Combined-cycle dual fuel gas-diesel or gas-fuel oil turbines, and steam turbines.

In particular, an example of a regasification and electricity production unit 18 comprising a combined cycle is shown in FIG. 5 .

The electricity production module 32 includes an air compressor 34 configured to compress inlet air, a combustion chamber 38 supplied with compressed air and gases by the regasification module 30, and a first alternator to produce electricity. It includes a fed gas turbine 40 that allows rotation of the alternator 41. Production module 32 further has a plurality of compressors 34, combustion chambers 38, gas turbines 40, and alternator 41, connected to other components of production module 32. You can.

The electricity production module 32 further comprises a steam-generating heat exchanger 42 arranged, for example, between the closed cycle in which water circulates and the outlet of the gas turbine 34 . Steam-generating heat exchanger 42 is configured to evaporate water before entering steam turbine 44. Steam turbine 44 allows rotation of a second alternator 46 to also produce electricity.

The vapor at the outlet is sent to a condenser 48 configured to condense the vapor into liquid water. The condenser 48 is supplied with water taken from the water body 12. Pump 49 is configured to circulate water in a closed cycle.

As can be seen in FIG. 5 , the regasification and electricity production unit 18 is then advantageously arranged between the regasification module 30 for heating the liquefied natural gas and the electricity production module 32 to form a combined cycle. It includes a first heat exchanger 50 that condenses steam at the outlet of the steam turbine.

Therefore, the first exchanger 50 uses the regasification module 30 as a cold source to contribute to the condensation of the vapors in the closed cycle, thereby reducing the amount of water from the water body 12 required for the condensation of all the vapors. By reducing it, it becomes possible to improve the overall efficiency of the equipment 10.

According to Figure 5, exchanger 50 is inserted in series at the outlet of condenser 48. However, other architectures may be advantageously used, particularly by using a bypass that supplies only a portion of the water circulating in condenser 48 to exchanger 50. This architecture has the advantage of being able to adapt more easily to different heat exchange demands, especially during the start-up phase or part-load operation when only some of the gas turbines are operating.

6 shows the open cycle of an open-cycle gas turbine 44, or the open cycle of a combined cycle.

As can be seen in FIG. 6 , the regasification and electricity production unit 18 is advantageously arranged between the regasification module 30 for heating liquefied natural gas and the electricity production module 32 to operate the gas turbine. (40) It includes a second heat exchanger (52) that cools the intake air into it. Here, the second exchanger 52 is arranged upstream of the compressor 34.

In a variant not shown, when the means for producing electricity is an engine, the second heat exchanger 52 is arranged between the regasification module 30 for heating the liquefied natural gas and the electricity production module 32 to heat the liquefied natural gas into the engine. Cools the intake air.

Advantageously, the second exchanger 52 comprises a secondary circuit in which the intermediate fluid circulates, so that in case of malfunction of the second exchanger 52 there is a risk of gas leakage from the inlet of the gas turbine 40 or the engine. Avoid.

The second exchanger 52 makes it possible to cool the intake air supplied to the gas turbine 40 or gas engine, improving their efficiency.

Figure 7 shows only the closed cycle of the combined cycle when the means for producing electricity includes a combined-cycle gas turbine 40 and a steam turbine 44.

As can be seen in this Figure 7, the electricity production module 32 advantageously includes at least one wet cooling tower 54 to cool the water at the outlet of the condenser 48 prior to discharge into the water body 12. Includes.

Cooling tower 54 cools the water exiting condenser 48 by spraying this water within the tower, where it is cooled by a stream of ambient air circulating in the tower, and then collects the water and discharges it into water body 12. It is configured to do so.

Cooling tower 54 causes water to be discharged into body of water 12 at substantially the same temperature as the water taken from the body of water, thereby reducing the temperature of body 12 and thus the impact on the aquatic animal population within body 12. .

The transfer unit 20 is configured to transfer liquefied natural gas between the storage unit 16 and the regasification and electricity production unit 18 , in particular by means of at least one transfer pump arranged on the storage unit 16 .

In the example of FIG. 1 , the delivery unit 20 is configured to supply liquefied natural gas directly to the regasification module 30, advantageously at a flow rate of between 10 m ³ /h and 500 m ³ /h.

In a variant of Figure 2, when the regasification and electricity production unit 18 comprises a buffer tank 33, the delivery unit 20 advantageously operates at a flow rate of between 500 m ³ /h and 3000 m ³ /h. It is configured to deliver liquefied natural gas to the buffer tank 33. This allows the use of standard delivery pumps and does not require the installation of a continuously operating low flow pump.

As can be seen in FIG. 1 , delivery unit 20 includes ducts arranged on pier 22 to transfer liquefied natural gas from storage unit 16 to regasification and electricity production unit 18. .

Advantageously, the ducts are articulated rigid pipes.

Alternatively, the ducts are cryogenic flexible pipes.

During delivery of liquefied natural gas, significant accumulation of ice may occur around the delivery unit 20. Therefore, articulated rigid pipes are preferred over flexible pipes, which tend to remain rigid in the presence of an ice layer.

Advantageously, each pipe is equipped with redundancy for operational safety.

In a variant of FIG. 2 , the delivery unit 20 comprises ducts directly connecting the storage unit 16 and the regasification and electricity production unit 18 . “Directly” is understood to mean that the ducts do not rest on piers 22 or other intermediate supports between the two units 16, 18.

Advantageously, the delivery unit 20 transfers the gas present in the regasification module 30 or in the buffer tank 33 back to the storage unit 16, thereby transferring the gas from the main tank to the regasification module 30 or buffer tank 33 respectively. It is configured to compensate for the volume of liquid delivered to the tank 33. This delivery of gas is advantageously carried out in parallel with the delivery of liquefied natural gas by at least one independent dedicated duct.

Now, a method for producing electricity by the equipment 10 will be described.

Initially, the storage unit 16 and the regasification and electricity production unit 18 are floating on the water body 12, on a pier 22 as can be seen in FIGS. 1 and 2 and/or in FIG. 3 It is moored to at least one floating buoy 26 as can be seen and/or to at least one fixed line 27 as can be seen in FIG. 4 .

The LNG carrier 26 is towed alongside the storage unit 16 and then moored thereto.

The LNG carrier 26 then delivers liquefied natural gas to the main tank 28 of the storage unit 16.

Accordingly, the storage unit 16 stores large quantities of liquefied natural gas, especially quantities of 5000 m ³ to 300,000 m ³ liquefied natural gas.

The method then includes transferring liquefied natural gas from the main tank 28 of the storage unit 16 to the regasification and electricity production unit 18 through a delivery unit 20.

In the example of FIG. 1 , the delivery unit 20 supplies liquefied natural gas directly to the regasification module 30, advantageously at a flow rate of between 10 m ³ /h and 500 m ³ /h.

Accordingly, in this example, delivery unit 20 continuously supplies liquefied natural gas to regasification module 30 for as long as needed to produce electricity.

In the variant of FIG. 2 , the delivery unit 20 advantageously delivers liquefied natural gas to the buffer tank 33 at a flow rate of between 500 m ³ /h and 3000 m ³ /h. In particular, the delivery unit 20 delivers liquefied natural gas to the buffer tank 33 until the buffer tank 33 is full. When the capacity of the buffer tank 33 is also smaller than the threshold value, the delivery unit 20 then delivers the liquefied natural gas to the buffer tank 33. Accordingly, delivery unit 20 periodically delivers liquefied natural gas to ensure that there is a sufficient amount of liquefied natural gas in buffer tank 33.

The liquefied natural gas is then transferred from the buffer tank 33 to the regasification module 30 when needed to produce electricity.

The method then includes regasifying the liquefied natural gas into a gaseous state by means of a regasification module (30).

In particular, liquefied natural gas is circulated in evaporators allowing regasification to obtain the gas again.

The gas is then transferred from the regasification module 30 to the electricity production module 32.

The method then includes producing electricity from the gas by the electricity production module 32.

In particular, gas is used as fuel in a gas engine or gas turbine 40.

In the example of FIG. 5 , gas is injected into combustion chamber 38 and supplies gas turbine 40 . Rotation of the gas turbine 40 drives a first alternator 41, which in turn produces electricity.

When the means of producing electricity is a combined cycle as shown in Figure 5, a steam-generating heat exchanger 42 arranged between the outlet of the gas turbine 34 and the closed cycle evaporates the water before entering the steam turbine 44. Makes what is done possible. Steam turbine 44 drives a second alternator 46, which in turn produces electricity.

The generated electricity is then sent via electrical lines 15 to feed the power grid, land infrastructure 14, or alternatively marine infrastructure.

At this point, it can be seen that the present invention has a number of advantages.

The invention has the same flexibility of storage of liquefied natural gas and generation of electricity on water as prior art solutions. In fact, it is possible to easily move the installation 10 over the water body 12 and thus, with the production method according to the invention, to quickly supply electricity to the infrastructure or network that needs this electricity. Additionally, structural and environmental impacts on the coast are limited.

Moreover, the method according to the invention makes it possible to produce electricity from natural gas in a much less expensive way than by prior art architectures. As an example, savings of approximately 20% are possible compared to a fully integrated FSRP architecture or an FSRU architecture with floating barges equipped with motors.

In fact, in the present invention, existing and converted LNG carriers can be used to act as storage units 16 with little modification and at a very competitive cost.

Compared to the FSRU configuration combined with a motorized floating barge, which requires managing the configuration or conversion of the FSRU as well as the configuration of the motorized barge, the present invention provides a single project to manage, namely the regasification and electricity production unit ( It makes it possible to have the configuration of 18).

Additionally, the absence of significant storage of liquefied natural gas on the regasification and electricity production unit 18 makes it possible to avoid the use of ballast and use a hull with a shallow draft similar to a simple flat barge. and thereby making it possible to significantly reduce the cost of construction of such units.

Moreover, the absence of significant storage of liquefied natural gas on the regasification unit also makes it possible to significantly facilitate the construction of the regasification and electricity production unit 18, since for the shipyard selected for construction the liquefied natural gas This is because experience storing gas is not required. Accordingly, multiple competing shipyards may be considered for the construction of some of these units 18.

Finally, the possibility of using heat integration between the regasification module 30 and the electricity production module 32 to increase the overall efficiency of the plant also contributes to the reduction of the environmental impact of the plant 10 and its overall competitiveness. This thermal optimization is not possible with a FSRU architecture combined with a motorized barge and is much more expensive with a fully integrated FSRP unit.

Claims (17)

A method for producing electricity by an installation (10) placed on a body of water (12), comprising:
The equipment 10 is,
- a floating storage unit (16), comprising a hull (17) defining an internal volume containing a main tank (28) for storing liquefied natural gas;
- a floating regasification and electricity production unit (18) separate from the storage unit (16), said regasification and electricity production unit comprising a regasification module (30) and a electricity production module (32). (18);
- a unit (20) for transferring liquefied natural gas between the storage unit (16) and the regasification and electricity production unit (18)
Including,
The production method comprises at least the following steps:
- delivering liquefied natural gas from the main tank (28) of the storage unit (16) to the regasification and electricity production unit (18) via the delivery unit (20);
- Regasifying the liquefied natural gas into gaseous gas by the regasification module 30;
- delivering the gas from the regasification module (30) to the electricity production module (32);
- producing electricity from the gas by the electricity production module 32
Including, a method of producing electricity. 2. A method according to claim 1, further comprising delivering liquefied natural gas from an LNG carrier (31) to the main tank (28) of the storage unit (16). 3. The method according to claim 1 or 2, wherein the delivery unit (20) supplies liquefied natural gas directly to the regasification module (30), advantageously at a flow rate of 10 m ³ /h to 500 m ³ /h. A method of producing electricity. 3. The method of claim 1 or 2, wherein the regasification and electricity production unit (18) further comprises a buffer tank (33) having a smaller capacity than the main tank (28),
The delivery unit (20) advantageously delivers the liquefied natural gas to the buffer tank (33) at a flow rate of between 500 m ³ /h and 3000 m ³ /h,
The liquefied natural gas is then transferred from the buffer tank (33) to the regasification module (30). 5. The method according to any one of claims 1 to 4, wherein the storage unit (16) and the regasification unit (18) are moored at a common pier (22) connected to an earthen dock (24). A method of producing electricity. 6. Method according to claim 5, wherein the storage unit (16) and the regasification and electricity production unit (18) are arranged along the pier (22) on both sides of the pier (22). Method according to claim 5, wherein the storage unit (16) and the regasification and electricity production unit (18) are arranged along the pier (22) on the same side of the pier (22). 5. The method according to any one of claims 1 to 4, wherein the storage unit (16) is moored to at least one floating buoy (26) fixed to the bottom of the body of water (12), and the regasification unit (16) is and an electricity production unit (18) is moored along the storage unit (16). 5. The storage unit (16) according to any one of claims 1 to 4, wherein the storage unit (16) is moored by at least one fixed line (27) fixed to the bottom of the water body (12), wherein the regasification and electricity production A method of producing electricity, wherein a unit (18) is moored along with the storage unit (16). 8. The method according to any one of claims 5 to 7, wherein the transfer unit (20) is configured to transfer the liquefied natural gas from the storage unit (16) to the regasification and electricity production unit (18). 22) A method of producing electricity, comprising ducts arranged on. 9. The storage unit (18) according to any one of claims 1 to 8, wherein the transfer unit (20) is configured to transfer the liquefied natural gas directly from the storage unit (16) to the regasification and electricity production unit (18). A method of producing electricity, comprising ducts directly connecting a unit (16) and the regasification and electricity production unit (18). 12. Method according to claim 10 or 11, wherein the ducts are articulated rigid pipes and/or cryogenic flexible pipes. 13. The method according to any one of claims 1 to 12, wherein the electricity production module (32) comprises:
- gas engine,
- Dual fuel engines of gas-diesel or gas-fuel oil,
- open-cycle gas turbine (40),
- open-cycle dual-fuel turbines on gas-diesel or gas-fuel oil,
- combined-cycle gas turbine (40) and steam turbine (44),
- Combined-cycle dual fuel, gas-diesel or gas-fuel oil, and steam turbines 44
A method of producing electricity, comprising an electricity production means selected from the group consisting of: 14. The method of claim 13, wherein the electricity production module (32) is a combined-cycle turbine and the regasification and electricity production unit (18) comprises the regasification module (30) for heating the liquefied natural gas and the electricity production unit (18). A method for producing electricity, comprising a first heat exchanger (50) arranged between modules (32) to condense steam at the outlet of the steam turbine (44) of the combined cycle. 15. The engine according to claim 13 or 14, wherein the regasification and electricity production unit (32) is arranged between the regasification module (30) for heating the liquefied natural gas and the electricity production module (32). or a second heat exchanger (52) that cools the intake air into the gas turbine (44). 16. The method according to any one of claims 13 to 15, wherein the electricity production module (32) is at least one combined-cycle gas turbine (40) and a steam turbine (44), the electricity production module (32) comprising: A condenser (48) for sampling water from the body of water (12) to condense the steam at the outlet of the steam turbine (44), and to collect water at the outlet of the condenser (48) prior to discharge into the body of water (12). A method of producing electricity, comprising at least one wet cooling tower (54) for cooling. 17. The method according to any one of claims 1 to 16, wherein the regasification and electricity production unit (18) comprises the liquefied natural gas circulating at the inlet of the regasification module (30) and/or the regasification module (30). ), comprising a system for measuring the gas circulating at the outlet.