KR102130716B1 - Ship Or Floating Marine Structure - Google Patents

Abstract

Ships or floating offshore structures are disclosed. Ship or floating offshore structure of the present invention, LNG storage tank for storing LNG; A regasification unit receiving gas from the LNG storage tank and regasifying it; A power generation unit that generates power by receiving regasified LNG from a BOG or regasification unit generated in an LNG storage tank is provided, and the regasified LNG or electricity produced by the power generation unit is supplied to the outside of a ship or floating offshore structure. It is characterized by.

Description

Ship or floating marine structure

The present invention relates to a ship or floating offshore structure, and more particularly, regasifies LNG supplied from an LNG storage tank to supply regasified LNG to the outside of the ship or floating offshore structure, and occurs in the LNG storage tank. The present invention relates to a ship or a floating offshore structure capable of supplying electricity to a ship or a floating offshore structure by generating BOG or regasified LNG as fuel.

As interest in eco-friendly energy increases, the consumption of natural gas is rapidly increasing worldwide. Natural gas is transported in gaseous form through onshore or offshore gas piping, or transported to remote consumers in the form of liquefied liquefied natural gas stored in LNG carriers (especially LNG carriers). Liquefied natural gas is obtained by cooling natural gas to an extremely low temperature (approximately -163°C), and its volume is reduced to approximately 1/600 than that of natural gas in a gas state.

LNG carriers are intended to load liquefied natural gas and operate the sea to unload liquefied natural gas to land demands. To this end, LNG storage tanks that can withstand the cryogenic temperatures of liquefied natural gas (commonly referred to as'cargo holds') It includes. Usually, these LNG carriers unload liquefied natural gas in the LNG storage tank as it is liquefied, and the unloaded LNG is regasified by an LNG regasification facility installed on the ground and transported through a gas pipeline to a consumer of natural gas. do.

It is known that such an LNG regasification facility on land is economically advantageous when the natural gas market is well formed and is stably installed where there is a demand for natural gas. However, in the case of natural gas demand where the demand for natural gas is seasonal, short-term, or periodically, it is very economically disadvantageous to install an LNG regasification facility onshore due to high installation cost and maintenance cost.

In particular, when LNG regasification facilities on the land are destroyed by natural disasters, etc., even if the LNG carriers load and reach LNG carriers, natural gas transportation using existing LNG carriers is limited in that it cannot be regasified. Holding

Accordingly, for example, an LNG regasification system has been developed in which an LNG regasification facility is provided on an LNG carrier to regasify liquefied natural gas at sea and supply natural gas obtained through the regasification to the land. And, prior art related to this offshore LNG regasification system is Korean Patent No. 0569621 (ExxonMobil Oil Corporation, method and system for gasifying liquefied natural gas on a transport ship), U.S. Patent No. 6,546,739 (Exmar Offshore Company, Method and apparatus for offshore LNG regasification, US Patent No. 6,578,366 (Moss Maritime AS, Device for evaporation of liquefied natural gas), US Patent No. 6,688,114 (El Paso Corporation LNG CARRIER, US Patent No. 6,598,408 (El Paso Corporation, Method and apparatus for transporting LNG), Korean Patent No. 0467963 (Gang Do-wook, Al&G Alv's gasification device operation method), US Patent No. 6,945,049 (Hamworthy KSE as, Regasification system and method), Korean Patent No. 0504237 (Daewoo Shipbuilding & Marine Engineering) Co., Ltd., ship equipped with a shielding means to block the bottom opening), Korean Patent No. 0474522 (Daewoo Shipbuilding & Marine Engineering, Seawater Heating System), Korean Patent Publication No. 2003 -0090686 (Life Hoegunt Co. , Ship and Unloading System), US Patent Publication No. 2005-0061002A (Shipboard regasification for LNG carriers with alternate propulsion plants), Korean Patent Publication No. 2004-0105801 (Excelate Energy Limited Partnership, Improved LNG Carrier), Korea Practical Use Registration No. 0410836 (Samsung Heavy Industries Co., Ltd., liquefied natural gas regasification system of liquefied natural gas ships).

Such a conventional LNG regasification vessel is equipped with a facility such as a vaporizer for regasification of liquefied natural gas stored in an LNG storage tank, and, in addition, piping in the system to supply regasified natural gas to a land requirement. And a connecting device connecting the gas piping of a land-based customer, and a ship position maintaining device that maintains the position of the ship during unloading of natural gas.

U.S. Patent No. 6,578,366

The present invention seeks to provide a ship or floating offshore structure capable of supplying regasified LNG and electricity to the ground.

The purpose of the present invention is to provide a gas and electric power supply facility capable of supplying gas and electric power from the sea by resolving the problem of securing the site and the construction cost when constructing regasification and power generation facilities on land. In addition, it is intended to provide a structure capable of increasing energy efficiency by regasifying LNG using waste heat during power generation.

According to one aspect of the invention, in a ship or floating offshore structure,

LNG storage tank for storing LNG;

A regasification unit receiving gas from the LNG storage tank and regasifying it;

The BOG generated in the LNG storage tank or the regasification unit is supplied with regasified LNG to generate a power generation unit,

Provided is a ship or floating offshore structure, characterized in that LNG regasified from the regasification unit or electricity produced by the power generation unit is supplied to the outside of the ship or floating offshore structure.

Preferably, the power generation unit is provided with a combined cycle power generation facility, and heats seawater with waste heat of exhaust gas discharged from the waste heat recovery steam generator of the combined cycle power generation facility, and supplies the heated seawater to the regasification unit to supply LNG. Can be regasified.

Preferably, the regasification unit may include a pump that pressurizes the LNG supplied from the LNG storage tank, and a regasifier that receives LNG from the pump and regasifies it by heat exchange with the seawater.

Preferably, the regasification unit further includes a recondenser provided at the front end of the pump, but the BOG supplied to the power generation unit is branched and supplied to the recondenser and mixed with the LNG to be introduced into the pump. .

Preferably, a turret connected to a pipe for transporting regasified LNG from the regasification unit to the land may be provided on the hull.

Preferably, an underwater buoy connecting the piping of the land and the piping of the hull transporting the regasified LNG from the regasification unit may be selectively coupled to the turret.

Preferably, the regasification unit and the power generation unit each have a modular structure, and a manifold connected to an external supply pipe is provided to receive LNG from the outside of the ship or floating offshore structure and store it in the LNG storage tank. Can be.

According to another aspect of the invention, in a ship or floating offshore structure,

The LNG supplied from the LNG storage tank is regasified to supply the regasified LNG to the outside of the ship or floating offshore structure, and the BOG generated from the LNG storage tank or the regasified LNG is generated as fuel to generate the vessel. Alternatively, a ship or floating offshore structure is provided, characterized in that electricity is supplied to the outside of the offshore offshore structure.

Preferably, in the ship or floating offshore structure, a combined cycle power generation facility is provided to heat seawater with waste heat of exhaust gas discharged from the waste heat recovery steam generator of the combined cycle power generation facility, and heat LNG by heat exchange with the heated seawater. It can be regasified.

Preferably, in the ship or floating offshore structure, the hull is provided with a turret connected to a pipe for transporting regasified LNG to the land, and a piping of the land and a hull for transporting regasified LNG An underwater buoy connecting the piping may be selectively coupled to the turret.

According to another aspect of the invention, in a ship or floating offshore structure,

A production facility unit that produces natural gas from a submarine gas field;

A liquefaction facility that liquefies natural gas produced in the production facility to produce LNG;

LNG storage tank for storing the LNG produced by the liquefaction facility;

A regasification unit receiving gas from the LNG storage tank and regasifying it;

The BOG generated in the LNG storage tank or the regasification unit is supplied with regasified LNG to generate a power generation unit,

Provided is a ship or floating offshore structure, characterized in that LNG regasified from the regasification unit or electricity produced by the power generation unit is supplied to the outside of the ship or floating offshore structure.

The ship or floating offshore structure of the present invention regasifies LNG supplied from the LNG storage tank to supply regasified LNG to the outside of the ship or floating offshore structure, and BOG generated from the LNG storage tank or regasified LNG can be generated as fuel to supply electricity to the outside of a ship or floating offshore structure.

By solving the problem of securing the site and the cost of construction through the present invention, it is possible to supply gas and electric power from the sea, and move to the place where there is a demand to rapidly regasify LNG and power.

1 schematically illustrates a concept in which a ship or a floating offshore structure according to an embodiment of the present invention is operated at sea.
FIG. 2 schematically illustrates a concept in which a regasification unit is operated by receiving seawater heated by exhaust discharged from a waste heat recovery steam generator of a combined cycle power plant in the embodiment of FIG. 1.
3 schematically illustrates a concept in which a ship or a floating offshore structure according to the second embodiment is operated at sea.

In order to fully understand the present invention, 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 and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing denote the same members.

1 schematically illustrates a concept in which a ship or floating offshore structure (S) according to an embodiment of the present invention is operated at sea.

As shown in Figure 1, the ship or floating offshore structure (S) according to this embodiment, the LNG storage tank (T) for storing LNG, and the LNG storage tank (T) is supplied with LNG from the regasification The generator 100 and the power generation unit 200 for generating power by receiving the regasified LNG from the BOG or regasification unit 100 generated in the LNG storage tank T are provided, and the LNG regasified in the regasification unit 100 Alternatively, it is characterized in that the electricity produced by the power generation unit 200 is supplied to the outside of the ship or floating offshore structure S (E, NG).

In this embodiment, the ship or floating offshore structure (S) is meant to include both ships and special vessels with or without self-propelled devices that move to carriers. For example, it may be a floating barge.

Conventionally, a regasification vessel (RV) or a floating storage regasification unit (FSRU) for supplying regasified LNG from the sea to the ground is known, but this embodiment, along with the function of supplying regasified LNG, the LNG storage tank (T ) Proposes a structure that performs the function of generating a large amount of BOG or regasified LNG.

Therefore, it is possible to not only supply power to the land through this embodiment, but also to reduce the cost of reliquefaction for separately processing BOG and to prevent waste of fuel when burning and removing BOG.

In this embodiment, the power generation unit 200 is provided with a combined cycle power plant, and seawater is used as waste heat of exhaust gas discharged from the heat recovery steam generator 210 of the combined cycle power plant. Is heated, and the heated seawater is supplied to the regasification unit 100 to regasify LNG. To this end, a seawater heat exchanger 300 for heating the seawater by heat exchange with exhaust gas discharged from the waste heat recovery steam generator 210 may be provided.

The regasification unit 100 may include a pump 110 that pressurizes the LNG supplied from the LNG storage tank T, and a regasifier 120 that receives LNG from the pump 110 and regasifies it with sea water and heat exchange. .

The combined cycle power generation facility first generates electricity by driving the gas turbine with high-temperature combustion gas generated by burning fossil fuels, and then uses the high-temperature exhaust gas discharged from the gas turbine as a heat source in the waste heat recovery steam generator 210. After generating steam, it is a power generation facility that generates electricity by driving steam turbines with the steam.

In this embodiment, by heating the seawater with the waste heat remaining in the exhaust generated from the waste heat recovery steam generator 210, energy efficiency can be further increased.

On the other hand, after the LNG is pressurized by the pump 110, it can be regasified with natural gas of sufficient pressure to supply it to the land by exchanging heat with sea water.

The regasification unit 100 further includes a recondenser 130 provided at the front end of the pump 110, but the BOG supplied to the power generation unit 200 is branched and supplied to the recondenser 130 and mixed with LNG to pump It can be introduced into (110).

Since the pump 110 is preferably introduced in a liquid state, BOG is mixed with a sufficient amount of LNG in the recondenser 130 and introduced into the pump 110.

FIG. 2 schematically illustrates a concept in which the regasification unit 100 is operated by receiving seawater heated by exhaust discharged from the waste heat recovery steam generator 210 of the combined cycle power plant in this embodiment.

Meanwhile, BOG or regasified LNG supplied as fuel to the power generation unit 200 may be heated by the heater 220 and supplied to the power generation unit 200. At this time, the waste heat recovery steam generator may also be used as a heat source of the heater 220. The exhaust gas discharged from 210 may be used.

In the ship or floating offshore structure (S) of the present embodiment, a turret 400 (turret) connected to a pipe for transporting regasified LNG to the land from the regasifier 100 may be provided on the hull, In the same turret 400, an underwater buoy 500 (Buoy) connecting the piping of the land and the piping of the hull transporting the regasified LNG from the regasification unit 100 may be selectively combined.

By combining the underwater buoy 500 to the turret 400 of the hull, regasified LNG can be supplied to the shore along the submarine piping, and when ship inspection or replacement is required, ship or floating offshore structures (S ) When the movement is required, the underwater buoy 500 can be separated from the turret 400 and moved.

In this embodiment, the regasification unit 100 and the power generation unit 200 are each made of a modular structure so that installation of facilities for regasification and power generation on the topside of the hull can be made more efficiently.

In addition, the ship or floating offshore structure (S) of the present embodiment may be provided with a manifold 600 (manifold) connected to an external supply pipe to receive LNG from the outside and store it in the LNG storage tank (T). have. It is connected to an LNG terminal or an LNG carrier through the manifold 600 to receive LNG, load it into an LNG storage tank T, and supply it to the regasification unit 100 and the power generation unit 200. .

According to another aspect of the invention, in the ship or floating offshore structure (S),

The LNG supplied from the LNG storage tank (T) is regasified to supply the regasified LNG to the outside of the ship or floating offshore structure (S) (NG), and BOG or regasification generated from the LNG storage tank (T) A ship or floating offshore structure (S) is provided, characterized in that the LNG is generated as fuel to supply electricity to the outside of the ship or floating offshore structure (S).

Preferably, in a ship or floating offshore structure (S), a combined thermal power generation facility is provided to heat the seawater with the waste heat of the exhaust gas discharged from the waste heat recovery steam generator 210 of the combined thermal power generation facility, and heat exchange with the heated seawater LNG can be regasified.

Preferably in the ship or floating offshore structure (S), the hull is provided with a turret (400) (turret) that is connected to the piping for transporting the regasified LNG to the land, piping of the land, regasified LNG Underwater buoy 500 (Buoy) connecting the piping of the hull transporting the can be selectively coupled to the turret (400).

According to another aspect of the present invention, in the ship or floating offshore structure (S), the production equipment unit (P) for producing natural gas from the gas field (GW) of the seabed, and the natural gas produced in the production equipment unit (P) A liquefaction facility (L) for producing LNG by liquefying, an LNG storage tank (T) for storing LNG produced by the liquefaction facility (L), and a regasification unit for regasification by receiving LNG from the LNG storage tank (T) ( 100), the LNG generating tank (T) generated in the BOG or regasification unit generated from the regasification unit is provided with a power generation unit 200 for generating power, the regasification unit 100 regasified LNG or power generation unit (200) A ship or floating offshore structure is provided, characterized in that the electricity produced in) is supplied to the outside of the ship or floating offshore structure (S) (E, NG).

The concept of the ship or floating offshore structure S according to the second embodiment of the present invention is operated at sea is schematically illustrated in FIG. 3. That is, the ship or floating offshore structure S of the second embodiment is further provided with a production facility part P and a liquefaction facility part L in the first embodiment, thereby producing, liquefying, storing, and regasifying from the offshore gas field. And ships or floating offshore structures capable of performing power generation functions.

In the production facility section (P), natural gas is produced through purification processes such as slug catcher and gas/liquid separation from crude oil drilled in the gas field (GW), and the liquefaction section (L) removes acid gas from natural gas and dehydrates it. After dehydration, mercury removal, etc., it is cooled and liquefied to produce LNG.

Thereafter, the process of storing the produced LNG, regasifying and generating it, and supplying it to the outside may be performed as in the first embodiment, so a duplicate description is omitted.

As described above, the ship or floating offshore structure (S) of the present invention, LNG regasified to the outside of the ship or floating offshore structure (S) by regasifying the LNG supplied from the LNG storage tank (T) , And may generate BOG or regasified LNG generated in the LNG storage tank (T) as fuel to supply electricity to the outside of the ship or floating offshore structure (S). In addition, LNG is regasified using seawater that is easy to obtain from structures operated at sea such as ships or floating offshore structures (S), and by regasifying LNG by heating seawater through waste heat generated by the power generation unit 200 It can also regasify LNG and increase the energy efficiency of ships or floating offshore structures (S).

The present invention is capable of supplying gas and electric power while solving the problem of securing the land and the cost of construction through a ship or floating offshore structure (S) operated at sea, and is a place where there is a demand for natural gas or power. Through this, it is possible to quickly regasify LNG and supply electricity.

As described above, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to belong to the claims of the present invention.

S: Ship or floating offshore structure
T: LNG storage tank
100: regasification unit
110: pump
120: regasifier
130: recondenser
200: power generation department
210: waste heat recovery steam generator
220: heater
300: seawater heat exchanger
400: turret
500: underwater buoy
600: Manifold

Claims (11)

In ships or floating offshore structures,
LNG storage tank for storing LNG;
A regasification unit including a pump that pressurizes the LNG supplied from the LNG storage tank and a regasifier that receives and regases the LNG from the pump;
The BOG generated from the LNG storage tank or the regasified LNG is supplied from the regasification unit to generate power, and a power generation unit equipped with a combined thermal power generation facility is provided.
The sea water is heated by the waste heat of the exhaust gas discharged from the waste heat recovery steam generator of the combined cycle power generation facility, and the heated sea water is supplied to the regasifier of the regasification unit to regasify LNG,
A ship or floating offshore structure storing LNG, and supplying LNG regasified at the regasification unit and electricity produced by the power generation unit to the outside of the ship or floating offshore structure. delete delete According to claim 1,
The regasification unit further includes a re-condenser provided at the front end of the pump,
The BOG supplied to the power generation unit is branched, supplied to the re-condenser, mixed with the LNG, and introduced into the pump or a floating offshore structure. According to claim 1,
Vessel or floating offshore structure, characterized in that the turret (turret) connected to the piping for transporting the regasified LNG to the land from the regasification unit is provided on the hull. The method of claim 5,
The turret is a ship or floating offshore structure, characterized in that an underwater buoy (Buoy) connecting the piping of the land and the piping of the hull transporting the regasified LNG from the regasification unit is selectively combined. According to claim 1,
Each of the regasification unit and the power generation unit has a modular structure,
In order to receive LNG from the outside of the ship or floating offshore structure and store it in the LNG storage tank, a manifold connected to an external supply pipe is provided. delete delete delete delete

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