KR20170108756A - A Regasification System Of Gas and Vessel having same - Google Patents

Abstract

According to the present invention, a ship with a gas regasification system includes a regasification device to regasify liquefied gas by seawater supplied by a seawater supply device. The seawater supply device comprises: a seawater supply line to supply the seawater to the regasification device; a seawater discharge line to discharge the seawater from the regasification device; a circulation connection line branching from the seawater discharge line to connect the seawater supply line; a first opening/closing valve arranged closer to a point on the circulation connection line connected to the seawater supply line; a second opening/closing valve arranged closer to a point on the circulation connection line branching from the seawater discharge line; a pressure maintaining device which is disposed on the circulation connection line, and maintains a pressure of seawater flowing in the circulation connection line; and a pressure maintaining device connection line to connect a gap between the pressure maintaining device and the first and the second opening/closing valve on the circulation connection line. The pressure maintaining device connection line supplies a fluid into the pressure maintaining device on the circulation connection line when the seawater switches to flow to the circulation connection line from the seawater discharge line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vessel having a gas regeneration system,

The present invention relates to a ship having a gas regeneration system.

Generally, it is known that LNG is a clean fuel and its reserves are more abundant than petroleum, and its usage is rapidly increasing as mining and transfer technology develops. This LNG is generally stored in a liquid state at a temperature of -162 ° C. or less under 1 atm of the main component. The volume of liquefied methane is about 1/600 of the volume of methane in a gaseous state in a standard state, Is 0.42, which is about one half of the specific gravity of crude oil.

LNG is liquefied with ease of transportation and used after vaporizing at the place of use after transportation. However, due to the risk of natural disasters and terrorism, it is feared to install LNG vaporization equipment onshore.

As a result, in place of the conventional liquefied natural gas regeneration system installed on the land, a system for supplying natural gas that is vaporized on the land by installing a regeneration device on an LNG carrier carrying the liquefied natural gas Is in the spotlight.

In the LNG regasifier system, the LNG stored in the liquefied gas storage tank is pressurized by the booster pump and sent to the LNG vaporizer, which is vaporized by the LNG vaporizer and sent to the onshore consumer. Here, a large amount of energy is required in the process of heat exchange in which the temperature of the LNG is increased on the LNG vaporizer. Therefore, in order to solve the problem that the energy used in this process is wasted due to inefficient exchange, various heat exchange techniques for efficient regeneration have been studied.

SUMMARY OF THE INVENTION The present invention has been made to improve the prior art, and it is an object of the present invention to provide a ship having a gas regeneration system in which the regeneration efficiency of the liquefied gas can be maximized.

A ship equipped with a gas regeneration system according to the present invention is a ship having a gas regeneration system including a regeneration device for regenerating liquefied gas through seawater supplied by a seawater supply device, A seawater supply line for supplying the seawater to the regeneration device; A seawater discharge line for discharging the seawater from the regasification apparatus; A circulation connection line branched from the seawater discharge line and connecting the seawater supply line; A first open / close valve disposed closer to a point where the water supply line on the circulation connection line is connected to the seawater supply line; A second open / close valve disposed closer to the branching point of the seawater discharge line on the circulation connection line; A pressure holding device provided on the circulation connection line and maintaining the pressure of seawater flowing in the circulation connection line; And a pressure maintaining device connection line connecting the pressure presumption device and the first on-off valve on the circulation connection line and the second on-off valve, wherein the pressure maintaining device connection line is connected to the seawater discharge line The fluid in the pressure holding device is supplied onto the circulation connecting line when the fluid is flowing from the circulating connecting line to the circulating connecting line.

Specifically, the apparatus further includes a seawater pump provided on the seawater supply line for supplying the seawater to the regenerator, wherein the seawater pump can be positioned lower than the sea level.

A third opening / closing valve provided upstream of the seawater pump on the seawater supply line; A fourth open / close valve provided downstream of a branch point of the circulation connection line on the seawater discharge line; A pressure holding fluid supply valve provided on the pressure holding device connecting line; And a controller for adjusting the opening degree of the first to fourth on-off valves and the pressure maintaining fluid supply valve to implement non-stop when the seawater is switched from the seawater discharge line to the circulation connection line .

Specifically, the control unit may control to open the pressure maintaining fluid supply valve to supply the fluid to the circulation connecting line when switching the seawater to flow from the seawater discharge line to the circulation connecting line.

Specifically, the control unit may control to close the third and fourth open / close valves and open the first and second open / close valves when the fluid is filled on the circulation connecting line.

Specifically, the pressure holding device can maintain the pressure of seawater by using atmospheric pressure.

Specifically, the fluid inside the pressure maintaining device may be seawater.

Specifically, the fire extinguishing water storage tank further includes a fire extinguishing water storage tank for storing fire extinguishing water, and the pressure maintaining device may be connected to the fire extinguishing water storage tank for fire extinguishing.

Specifically, the fire extinguishing water storage tank for fire suppression may supply the fire extinguishing water stored in the fire extinguishing water storage tank to the pressure maintaining device when switching the seawater to flow from the seawater discharge line to the circulation connecting line.

Specifically, the regeneration device may include a vaporizer for directly vaporizing the liquefied gas with the seawater.

Specifically, the regasification apparatus includes a vaporizer for vaporizing the liquefied gas with intermediate heat; And a heat source heat exchanger for supplying the heat source of the seawater to the intermediate fruit.

Specifically, the first on-off valve is a nonstop switching valve, the second on-off valve is a circulation valve, the third on-off valve is a seawater supply valve, the fourth on- The control unit may be a third control unit.

The ship equipped with the gas regeneration system according to the present invention has the effect of maximizing the regeneration efficiency of the liquefied gas.

1 is a conceptual view of a ship having a gas regeneration system according to an embodiment of the present invention.
2 is a conceptual diagram of a seawater supply apparatus according to the first embodiment of the present invention.
3 is a conceptual diagram of a seawater supply apparatus according to a second embodiment of the present invention.
4 is a conceptual diagram of a seawater supply apparatus according to a third embodiment of the present invention.
5 is a conceptual diagram of a seawater supply apparatus according to a fourth embodiment of the present invention.
6 is a conceptual diagram of a seawater supply apparatus according to a fifth embodiment of the present invention.
7 is a conceptual diagram of a seawater supply apparatus according to a sixth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to the evaporative gas. In addition, LNG can be used to encompass both NG (natural gas), which is a liquid state, and NG, which is a supercritical state for the sake of convenience. The LNG may be used to mean not only a gas state evaporation gas but also a liquefied evaporation gas .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual view of a ship having a gas regeneration system according to an embodiment of the present invention.

1, the gas regeneration system 1 according to the embodiment of the present invention includes a liquefied gas storage tank 10, a feeding pump 20, a buffer tank 30, a boosting pump 40, A vaporizer 50, a customer 60, and a seawater supply device 100.

Here, a ship (not shown) provided with the gas regeneration system 1 has a hull H composed of a bow (not shown), a stern (not shown), and an upper deck (not shown) And the propeller shaft S is propelled and operated by transmitting the power produced by the engine E of the engine room (not shown) disposed on the stern part to the propeller P and operating.

In order to enable the liquefied gas to be regenerated at sea and to supply the liquefied gas to the land terminal, the ship is provided with a liquefied gas regeneration system 1 in which a gas regeneration system 1 is installed in a liquefied gas carrier line (not shown) Ship (LNG RV) or floating liquefied gas storage and regasification facility (FSRU).

The gas regeneration system 1 according to the embodiment of the present invention will be described with reference to FIG.

The gas regeneration system 1 according to the embodiment of the present invention is a system in which the liquefied gas in a liquid state is taken out from the liquefied gas storage tank 10 through the feeding pump 20 and is supplied to the boosting pump 40 via the buffer tank 30, The liquefied gas is heated and regenerated in the vaporizer 50 through a heat source, and then supplied to the customer 60. That is, in brief, the gas regeneration system 1 of the present invention regenerates the liquefied gas using the vaporizer 50 and supplies it to the consumer 60.

The vaporizer 50 can supply the seawater directly from the seawater supply device 100 to regenerate the liquefied gas (direct regeneration method), and indirectly supply the seawater from the seawater supply device 100 to recover the liquefied gas (Indirect regeneration mode: a method in which the glycol water as the intermediate fruit is supplied with the heat source of the seawater from the heat source heat exchanger 110 and the heat source supplied from the seawater again to the vaporizer 50)

It should be noted that in all the embodiments of the present invention, the indirect regeneration system will be described on the basis of the indirect regeneration system, and this is for convenience of description only, And the indirect regeneration system may refer to the evaporator 50 and the heat source heat exchanger 110 as a whole and may be referred to as a heat source heat exchanger 110 for convenience.

The gas regeneration system 1 according to the embodiment of the present invention may further include a liquefied gas supply line RL and valves (not shown) capable of adjusting opening degree may be installed on the liquefied gas supply line RL And the supply amount of the liquefied gas or the vaporized liquefied gas can be controlled according to the opening degree control of each valve.

The liquefied gas supply line RL connects the liquefied gas storage tank 10 and the consumer 60 and includes a feeding pump 20, a buffer tank 30, a booster pump 40, and a vaporizer 50 , The liquefied gas stored in the liquefied gas storage tank 10 may be regenerated and then supplied to the customer 60.

Hereinafter, individual configurations for implementing the gas regeneration system 1 according to the embodiment of the present invention will be described in detail.

The liquefied gas storage tank 10 stores liquefied gas to be supplied to the customer 60. The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, at which time the liquefied gas storage tank 10 may take the form of a pressure tank.

Here, the liquefied gas storage tank 10 is disposed inside the hull H, and four liquefied gas storage tanks 10 may be formed in front of the engine room. In addition, the liquefied gas storage tank 10 is not particularly limited to various types such as a membrane-type tank or an independent tank, for example.

The feeding pump 20 is provided on the liquefied gas supply line RL and is provided inside or outside the liquefied gas storage tank 10 to store the liquefied gas stored in the liquefied gas storage tank 10 in the buffer tank 30, .

Specifically, the feeding pump 20 is provided between the liquefied gas storage tank 10 and the buffer tank 30 on the liquefied gas supply line RL to store the liquefied gas stored in the liquefied gas storage tank 10 in a primary And can be supplied to the buffer tank 30 by pressurization.

The feeding pump 20 can pressurize the liquefied gas stored in the liquefied gas storage tank 10 to 6 to 8 bar and supply the liquefied gas to the buffer tank 30. Here, the feeding pump 20 may pressurize the liquefied gas discharged from the liquefied gas storage tank 10 so that the pressure and the temperature may be somewhat higher, and the pressurized liquefied gas may still be in a liquid state.

In this case, the feeding pump 20 may be a submergible pump when it is provided inside the liquefied gas storage tank 10 and may be a pump that is stored in the liquefied gas storage tank 10 when it is installed outside the liquefied gas storage tank 10. May be provided at a position inside the hull (H) lower than the level of the liquefied gas and may be a centrifugal pump.

The buffer tank 30 is provided on the liquefied gas supply line RL and can receive liquefied gas from the liquefied gas storage tank 10 and temporarily store the liquefied gas.

Specifically, the buffer tank 30 can receive the liquefied gas stored in the liquefied gas storage tank 10 from the feeding pump 20 through the liquefied gas supply line RL, and temporarily stores the supplied liquefied gas The liquefied gas can be separated into a liquid phase and a vapor phase, and the separated liquid phase can be supplied to the boosting pump 40.

That is, the buffer tank 30 temporarily stores the liquefied gas to separate the liquid phase and the vapor phase, and then supplies the complete liquid phase to the boosting pump 40 so that the boosting pump 40 satisfies the effective suction head NPSH , Thereby preventing cavitation in the boosting pump (40).

The boosting pump 40 may be provided between the buffer tank 30 and the vaporizer 50 on the liquefied gas supply line RL and may be provided between the liquefied gas supplied from the feeding pump 20 or the buffer tank 30 The supplied liquefied gas can be supplied to the vaporizer 50 while being pressurized to 50 to 120 bar.

The boosting pump 40 can pressurize the liquefied gas in accordance with the pressure demanded by the customer 60 and can be configured as a centrifugal pump.

The vaporizer 50 is provided on the liquefied gas supply line RL to regenerate the high-pressure liquefied gas discharged from the boosting pump 40.

Specifically, the vaporizer 50 is provided on the liquefied gas supply line RL between the customer 60 and the boosting pump 40 to vaporize the high-pressure liquefied gas supplied from the booster pump 40, Can be supplied in a desired state.

The vaporizer 50 receives the intermediate heat through the heat source circulation line GWL, heat-exchanges the liquefied gas with the liquefied gas, vaporizes the liquefied gas, and circulates the intermediate heat that has been heat-exchanged with the liquefied gas through the heat source circulation line GWL.

The vaporizer 50 may include a heat source heat exchanger 110 on the heat source circulation line GWL to continuously supply the heat source to the first fruit. The vaporizer 50 may further include a heat source pump GWP, Circulating line GWL.

At this time, the vaporizer 50 may use non-explosive fruits such as Glycol Water, Sea Water, Steam, or engine exhaust gas as the first fruits for vaporizing the cryogenic liquefied gas, The vaporized liquefied gas at a high pressure can be supplied to the customer 60 without pressure fluctuation.

Here, the heat source supply device 110 receives the heat source through the seawater and transfers the heat source to the vaporizer 50, and the device that transfers the seawater to the heat source supply device 110 is referred to as the seawater supply device 100.

The seawater supply device 100 supplies seawater as a heat source for rejuvenating the liquefied gas to the regeneration device by the regeneration device (heat source heat exchanger 110), and uses an open loop operation type ) And a closed loop operation method (a closed loop operation method).

Here, the open loop operation type refers to the case where the supply and discharge of the seawater is performed only in one direction from the seawater supply line L1 to the seawater discharge line L2, the loop operation tyoe is connected to the seawater supply line L1, the seawater discharge line L2 and the circulation connection line L3 via the sea water supply line L1, the seawater discharge line L2 and the circulation connection line L3 It refers to the case where circulation of seawater occurs.

In the embodiment of the present invention, the seawater supply device 100 can be bidirectionally switched from the open-loop driving method to the closed-loop driving method. The switching of the driving method of the seawater supply device 100 is caused by the temperature change of the seawater.

In summer, the temperature of seawater is high, so seawater can be used as a heat source for liquefied gas. However, since the temperature of seawater is low in winter, seawater can not be used as a source of regeneration of liquefied gas as it is, and seawater should be heated and used as a regenerating heat source for liquefied gas.

In order to reduce the supply of the heating source and efficiently use the energy, the seawater supply apparatus 100 is driven by the open circuit, that is, the open loop driving system in summer, and the seawater supply apparatus 100 is closed by the closed circuit .

The conventional seawater supply device (not shown) is configured to supply the internal packing fluid (air) on the circulating connecting line L3, which is not used in the open-loop driving method, There is a problem that the operation of the seawater supply device must be stopped for two to three days.

This is because, if the internal packing fluid on the circulating connection line L3 is used without being removed, air is introduced into the seawater pump 140 and cavitation occurs in the seawater pump 140, There is a reason.

In order to solve the above problems, in the embodiment of the present invention, in the embodiment of the present invention, the seawater supply apparatus 100 is implemented in a non-stop mode in bidirectional switching from an open- .

Below. 1, the reference numerals 120, 130, 140, L4, SW1, and SW2 denote a heater 120, a pressure maintaining unit When explaining the seawater supply apparatus 100 in FIGS. 2 to 7, the apparatus 130, the seawater pump 140, the pressure maintaining apparatus connecting line L4, the seawater inlet SW1 and the seawater outlet SW2, I will explain it in detail.

2 is a conceptual diagram of a seawater supply apparatus according to the first embodiment of the present invention.

2, the seawater supply device 100a includes a heat source heat exchanger 110, a heater 120, a pressure holding device 130, a seawater pump 140, an intermediate tank 150, 170).

Before describing the individual configurations of the seawater supply apparatus 100a of the embodiment of the present invention, the basic flow paths for organically connecting the individual structures will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

The embodiment of the present invention may further include a seawater supply line L1, a seawater discharge line L2, a circulation connection line L3, and a pressure maintaining device connection line L4. Valves (not shown) can be provided on each line, and the amount of seawater or fluid supplied can be controlled according to the opening degree of each valve.

The seawater supply line L1 connects the seawater inlet SW1 and the heat source heat exchanger 110 and supplies the seawater supplied from the seawater inlet SW1 to the heat source heat exchanger 110 through the seawater pump 140 have.

The seawater supply line L1 may have a seawater pump 140, a seawater inlet valve B1 and a heater 120, and may be disposed at least below some sea level. The seawater inlet port SW1 may be located about 5 meters below the sea surface and the seawater inlet valve B1 may be provided upstream of the seawater pump 140 on the seawater supply line L1.

The seawater discharge line L2 connects the heat source heat exchanger 110 and the seawater outlet SW2 and can discharge seawater discharged from the heat source heat exchanger 110 to the seawater outlet SW2.

The seawater discharge line L2 may have a seawater discharge valve B2 and may be disposed at least below some sea level. Here, the seawater outlet SW2 may be located about 1.6m below the sea surface, and the seawater discharge valve B2 may be provided downstream of the branch point of the circulation connection line L3a on the seawater discharge line L2.

The circulating connection line L3 is branched from the seawater discharge line L2 to connect the seawater supply line L1 and is connected to the sea water discharge line L2 ) Can be re-supplied to the seawater supply line to circulate the seawater.

Specifically, the circulating connection line L3 is branched at the upstream of the seawater discharge valve B2 on the seawater discharge line L2 and is branched between the seawater supply valve B1 on the seawater supply line L1 and the seawater pump 140 And may be provided with a circulation valve B3. Here, the point at which the circulating connection line L3 branches upstream of the seawater discharge valve B2 on the seawater discharge line L2 may be located at a position about 20 m higher than the sea level.

The circulation connection line L3 in the seawater supply apparatus 100a according to the present embodiment may be constituted by the circulation connection line L3a and the intermediate tank bypass line L3b. The circulating connection line L3a may include the intermediate tank 150 and the circulation valve B3 and the intermediate tank supply valve B6 and the intermediate tank bypass line L3b may include the circulating connection line L3a And may include an intermediate tank bypass valve (B5) configured to bypass the intermediate tank (150).

The circulation valve B3 may be provided closer to the branch point with the seawater discharge line L2 than the intermediate tank 150 on the circulation connection line L3a and the intermediate tank supply valve B6 may be provided on the circulation connection line L3a, L3a may be closer to the intermediate tank 150 than the branch point with the seawater discharge line L2.

The bypass line L3b may be configured to bypass the intermediate tank 150 when the seawater is filled in the intermediate tank 150, the seawater flowing on the circulating connection line L3a.

The pressure maintaining device connecting line L4 connects the pressure maintaining device 130 and the circulating connecting line L3a and the pressure holding device connecting line L4 maintains the pressure in the circulating connecting line L3a when the seawater supplying device 100a is driven by the closed- And can supply the seawater stored in the device 130. Here, the pressure maintaining device connection line L4 may include a pressure maintaining device supply valve B4.

Hereinafter, the individual structures that are organically formed by the above-described lines L1 to L4 and implement the seawater supply device 100a will be described.

The heat source heat exchanger 110 is connected to the sea water supply line L 1 and the sea water discharge line L 2 and can be disposed at a position higher than the sea level by about 30 m above the sea level.

The heat source heat exchanger 110 can receive the seawater through the seawater supply line L 1 and can transfer the heat source to the intermediate fruit and discharge the seawater that has exchanged heat with the intermediate fruit through the seawater discharge line L 2.

The heat source heat exchanger 110 may be a shell & tube type or a printed circuit heat exchanger (PCHE).

The heater 120 is provided between the heat source heat exchanger 110 on the seawater supply line L1 and the seawater pump 140 and can be disposed at a position higher than the sea level by about 30 m above the sea level.

The heater 120 supplies seawater to the heat source heat exchanger 110 through the seawater supply line L1 and can be operated when the seawater supply device 100a is driven in a closed loop driving mode. That is, the temperature of the seawater can be heated when the temperature of the seawater is too low to allow the heat source heat exchanger 110 to transmit the necessary heat source as the intermediate heat.

At this time, the heater 120 can heat the seawater by receiving a heat source such as steam from a boiler (not shown), but it is not limited thereto and may be an electric heater.

The pressure holding device 130 is provided on the circulation connection line L3a and can maintain the pressure of the seawater flowing in the circulation connection line L3a.

The pressure holding device 130 may be connected through a pressure maintaining device connecting line L4 between the intermediate tank 150 and a point where the seawater supplying line L1 is connected to the circulating connecting line L3a, When the seawater supply device 100a is driven by the closed loop driving method, the pressure holding device supply valve L4 may be opened to maintain the pressure of the seawater flowing on the circulation connecting line L3a with the fluid stored therein .

At this time, the pressure holding device 130 is composed of a container which is positioned at a position about 35 m higher than the sea level and opened to communicate with the atmosphere, and the pressure of the seawater can be maintained by using the atmospheric pressure.

That is, in the embodiment of the present invention, the pressure holding device 130, which is located about 35 m higher than the sea level, is connected to the circulation connecting line L3a located at about 5 m lower than the sea level, The pressure of the seawater flowing into the seawater pump 140 can be compensated by using the circulation line L3a, the seawater supply line L1 and the seawater discharge line L2 The pressure of circulating seawater can be kept constant.

The seawater pump 140 is provided on the seawater supply line L1 and can supply the seawater to the regenerator, that is, the heat source heat exchanger 110. [

The seawater pump 140 is provided between the seawater supply valve B1 and the heater 120 on the seawater supply line L1 to pressurize the seawater supplied from the seawater inlet SW1 to supply the heater 120 To the heat source heat exchanger (110).

The heat source heat exchanger 110 and the heater 120 may be disposed at a higher position than the sea surface inside the hull H by placing the seawater pump 140 at a position lower than the sea surface in the hull H, The heat source heat exchanger 110 and the heater 120 may be disposed at a position about 30 m higher than the sea surface inside the hull H, Position.

Therefore, in order to supply the seawater from the seawater pump 140 to the heat source heat exchanger 110 and the heater 120, the seawater pump 140 pressurizes the seawater as much as the water head (about 35 m) And can be pressurized to a pressure of, for example, about 3.5 bar or more.

The intermediate tank 150 is provided on the circulation connection line L3a so as to allow the seawater to flow from the seawater discharge line L2 to the circulation connection line L3a, -Stop).

Specifically, the intermediate tank 150 is located on a circulation connection line L3a positioned higher than the sea level, and at least partially stores the seawater therein so as to be implemented as a non-stop when driven by a closed- It is possible to maintain one state.

That is, the intermediate tank 150 is provided on the circulation connection line L3a in a state where it is higher than the sea level, so that even when the seawater supply apparatus 100a is driven by the open-loop driving system, The circulation connection line L3a, which can be partially stored and located below the intermediate tank 150, is all filled with seawater. At this time, a portion higher than the sea surface in the intermediate tank 150 is filled with air, and a portion higher than the sea surface on the circulation connection line L3a is also filled with air.

Therefore, the seawater supply device 100a of the present invention is arranged such that, when the seawater supply device 100a is switched from the open-loop drive mode to the closed-loop drive mode, the circulation connection line L3a in the direction of the seawater pump 140 The seawater is already filled and the seawater pump 140 can be switched without stopping.

The intermediate tank 150 may further include an intermediate tank discharge valve B7 for discharging the packing fluid remaining on the circulation connection line L3a.

The intermediate tank discharge valve B7 is a valve for opening and closing the seawater supply device 100a when the seawater supply device 100a is switched to the closed-loop drive mode in the open- Can be discharged to the outside.

The first control unit 170 adjusts the opening degree of the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the intermediate tank bypass valve B5 and the intermediate tank supply valve B6, When the seawater is caused to flow from the seawater discharge line L2 to the circulating connection line L3a, that is, when the seawater supply device 100a is switched from the open-loop driving mode to the closed- Can be controlled.

The first control unit 170 controls the operation of the first control unit 170 in a wired or wireless manner with the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the intermediate tank bypass valve B5 and the intermediate tank supply valve B6 The opening degree of each of the valves B1 to B6 can be adjusted.

The first control unit 170 controls the circulation valve B3 and the intermediate tank supply valve 150 until the seawater is full in the intermediate tank 150 when the seawater supply device 100a is switched from the open- (B6) can be opened.

Specifically, when the seawater supply apparatus 100a is switched from the open-loop drive system to the closed-loop drive system, the first control unit 170 sets the open state of the seawater supply valve B1 and the seawater discharge valve B2 The intermediate tank bypass valve B5 is controlled to maintain the closed state and the circulation valve B3 and the intermediate tank supply valve B6 can be controlled to be switched from the closed state to the open state .

At this time, the seawater is supplied from the seawater inlet SW1, passes through the seawater supply line L1, is discharged to the seawater outlet SW2 through the seawater discharge line L2, and at least part of the seawater passing through the seawater discharge line L2 Is introduced into the circulating connection line L3a to fill the intermediate tank 150 with seawater.

That is, without switching off the operation of the seawater pump 140, the seawater supply apparatus 100a can be continuously switched from the open-loop drive system to the closed-loop drive system.

The first control unit 170 maintains the circulation valve B3 and the intermediate tank supply valve B6 in the open state until the seawater is filled in the intermediate tank 150 and the seawater is filled in the intermediate tank 150 The seawater supply valve B1 and the seawater discharge valve B2 and the intermediate tank supply valve B6 are closed while the intermediate tank bypass valve B5 is closed It can be controlled to open.

At this time, the seawater is supplied from the seawater pump 140 and flows into the circulating connection line L3a through the seawater supply line L1 through the seawater discharge line L2, and the seawater introduced into the circulating connection line L3a flows into the middle Is then joined to the circulating connection line L3a through the tank bypass line L3b and then supplied to the seawater supply line L1 to circulate the seawater in the close loop. That is, the sea water is continuously supplied to the sea water supply line L1, the seawater discharge line L2, the circulation connection line L3a, the intermediate tank bypass line L3b, the circulation connection line L3a, It will form a cycle.

As described above, in the embodiment of the present invention, when the seawater supply apparatus 100a is switched from the open loop drive system to the closed loop drive system, the removal of the packing fluid remaining in the circulation connection line L3a can be stably performed , It is possible to switch the drive system non-stop, and as a result, the supply and return of the regasified liquefied gas to the customer 60 can be smoothly performed.

3 is a conceptual diagram of a seawater supply apparatus according to a second embodiment of the present invention.

3, the seawater supply device 100b includes a heat source heat exchanger 110, a heater 120, a pressure holding device 130, a seawater pump 140, an orifice 160, a second controller 171 And a nonstop switching valve B3.

Since the heat source heat exchanger 110, the heater 120, the pressure holding device 130 and the seawater pump 140 are the same as those described in the seawater supply device 100a according to the first embodiment of the present invention, do.

Prior to describing the individual configurations of the seawater supply device 100b of the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

The embodiment of the present invention may further include a seawater supply line L1, a seawater discharge line L2, a circulation connection line L3, and a pressure maintaining device connection line L4. Valves (not shown) can be provided on each line, and the amount of seawater or fluid supplied can be controlled according to the opening degree of each valve. Here, the seawater supply line L1, the seawater discharge line L2 and the pressure maintaining device connection line L4 are the same as those described in the seawater supply apparatus 100a according to the first embodiment of the present invention.

The circulating connection line L3 is branched from the seawater discharge line L2 to connect the seawater supply line L1 and is connected to the seawater discharge line L2 ) To the seawater supply line (L1), thereby circulating the seawater.

Specifically, the circulating connection line L3 is branched at the upstream of the seawater discharge valve B2 on the seawater discharge line L2 and is branched between the seawater supply valve B1 on the seawater supply line L1 and the seawater pump 140 And may be provided with a nonstop switching valve B8. Here, the point at which the circulating connection line L3 branches upstream of the seawater discharge valve B2 on the seawater discharge line L2 may be located at a position about 5 m lower than the sea level.

 Hereinafter, the individual structures that are organically formed by the above-described lines L1 to L4 and implement the seawater supply device 100b will be described.

When the seawater is switched from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100b is switched from the open-loop drive mode to the closed-loop drive mode, , The pressure of the seawater supplied to the heat source heat exchanger (110) is regulated through the seawater supply line (L1). That is, the orifice 160 can reduce the pressure of the seawater supplied to the heat source heat exchanger 110 when the seawater supply device 100b is driven by the closed-loop driving system.

Here, the orifice 160 may have a shape in which the central portion is recessed by the auxiliary pressure device, and may be replaced by various devices other than the orifice as long as the device is capable of reducing the pressure of the seawater.

In the embodiment of the present invention, the seawater pump 140 does not change the pressure of seawater discharged even when the seawater supply device 100b is switched from the open-loop drive mode to the closed-loop drive mode. Accordingly, when seawater flows in the closed loop space, the head of the seawater is removed, so that much pressure through the seawater pump 140 is not required.

That is, the seawater pump 140 compensates for the pressure loss due to the internal resistance of the apparatus using seawater, for example, the heater 120 or the heat source heat exchanger 110 in the closed loop driving system. The pressure is excessively introduced into the heater 120 or the heat source heat exchanger 110 to cause vibration and noise.

In order to solve this problem, in the embodiment of the present invention, an orifice bypass line L8, a seawater isolation valve 161 and a bypass valve 162 are provided in addition to the orifice 160 so that the orifice 160 160 are not used, and the orifice 160 is driven at the time of driving by the closed loop driving system, thereby solving vibration and noise problems.

Here, the orifice 160 may be provided on the orifice bypass line L8 to reduce the pressure of the incoming seawater, and then supply the seawater to the heat source heat exchanger 110.

The seawater isolation valve 161 is provided between the heater 120 on the seawater supply line L1 and the heat source heat exchanger 110 so that the seawater supply device 100b is opened when driven by the open loop driving system, It can be closed when driven by a driving method.

The bypass valve 162 is disposed upstream of the orifice 160 on the orifice bypass line L8 so that the seawater supply device 100b is closed when driven by the open loop drive system, Can be opened.

The orifice bypass line L8 is branched between the heater 120 on the seawater supply line L1 and the seawater isolation valve 161 and again connected to the seawater isolation valve 161 on the seawater supply line L1 and the heat source heat exchanger And the seawater supply device 100b is connected to the sea water supply device 100b so that the sea water does not flow when the sea water supply device 100b is driven by the open loop driving method, The heat source heat exchanger 110 can supply the sea water.

Accordingly, in the embodiment of the present invention, the orifice 160, the orifice bypass line L8, the seawater isolation valve 161, and the bypass valve 162 are provided, and the seawater decompressed by the heat source heat exchanger 110 Thereby, vibration and noise are reduced.

The second control unit 171 adjusts the opening degree of the seawater supply valve B1, the seawater discharge valve B2 and the nonstop switching valve B8 so that the seawater is discharged from the seawater discharge line L2 to the circulating connection line L3 (I.e., non-stop) when the sea water supply device 100b is switched from the open-loop drive mode to the closed-loop drive mode.

Here, the second control unit 171 is connected to the seawater supply valve B1, the seawater discharge valve B2 and the nonstop switching valve B8 in a wired or wireless manner to open the respective valves B1, B2, B8 Can be adjusted.

When the seawater supply apparatus 100b is switched from the open-loop drive mode to the closed-loop drive mode, the second control unit 171 controls the flow of the seawater to the circulating connection line L3, Stop switching valve B8 is opened and the opening of the seawater supply valve B1 and the seawater discharge valve B2 is closed so that the seawater is discharged from the seawater discharge line L1, (L3).

Specifically, when the seawater supply apparatus 100b is switched from the open-loop drive system to the closed-loop drive system, the second control unit 171 instantaneously opens the nonstop switch valve B8 and simultaneously opens the seawater supply valve B1 And the opening of the seawater discharge valve B2 can be closed.

That is, the seawater supply device 100b can be continuously switched from the open-loop drive mode to the closed-loop drive mode without stopping the operation of the seawater pump 140.

At this time, the seawater is supplied from the seawater pump 140, flows into the circulating connection line L3 through the seawater discharge line L2 through the seawater supply line L1, and the seawater introduced into the circulating connection line L3 flows into the seawater And then supplied to the supply line L1 to circulate the seawater in the closed loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

The second control unit 171 controls opening of the seawater isolation valve 161 and the bypass valve 162 so that when the seawater is caused to flow from the seawater discharge line L2 to the circulation connection line L3, That is, the seawater supply apparatus 100b can control the inflow of seawater into the orifice 160 (decompression apparatus) when the apparatus is switched from the open-loop drive system to the closed-loop drive system or when driven by the closed-loop drive system.

The second control unit 171 may be connected to the seawater isolation valve 161 and the bypass valve 162 in a wired or wireless manner to adjust the opening of the respective valves 161 and 162.

The second control unit 171 closes the seawater isolation valve 161 and opens the bypass valve 162 when the seawater is switched from the seawater discharge line L2 to the circulation connection line L3, The heat source heat exchanger 110 can be supplied with the decompressed seawater by the orifice 160.

The nonstop switching valve B8 is provided on the circulating connection line and is operated when the seawater is caused to flow from the seawater discharge line L2 to the circulating connection line L3, When the switch is switched to the closed loop driving mode, it is implemented as a non-stop.

Specifically, the nonstop switching valve B8 is provided on the circulation connection line L3 located below the sea surface, and may be provided on the circulation connection line L3 located approximately 5 m below the sea surface, for example .

This causes the nonstop switching valve B8 to be located approximately 5 m below the sea surface and the point at which the circulating connection line L3 branches upstream of the seawater discharge valve B2 on the seawater discharge line L2, By being located at a position about 5 m lower, the seawater is filled on the circulating connection line L3, and there is no remaining packing fluid on the circulating connection line L3.

That is, even when the seawater supply device 100b is in the open loop driving mode, the nonstop switching valve B8 is filled with seawater without any packing fluid remaining in the circulating connection line L3, so that the seawater supply device 100b ) Is non-existent so that there is no remaining packing fluid that prevents the switching from the open-loop drive system to the closed-loop drive system non-stop, so that the switching can be performed non-stop.

As described above, according to the embodiment of the present invention as described above, even in the open loop drive system, all of the packing fluid remaining in the circulating connection line L3 is not filled with seawater, and the seawater supply device 100b is driven by the closed loop The switching to the drive system can be performed non-stop, and as a result, the supply and return of the regasified liquefied gas to the customer 60 can be smoothly performed.

4 is a conceptual diagram of a seawater supply apparatus according to a third embodiment of the present invention.

4, the seawater supply device 100c includes a heat source heat exchanger 110, a heater 120, a pressure holding device 130, a seawater pump 140, a ballast pump 141, 172).

Here, the heat source heat exchanger 110, the heater 120, the pressure holding device 130, and the seawater pump 140 are similar to those described in the seawater supply devices 100a and 100b according to the first and second embodiments of the present invention It is the same.

Before describing the individual configurations of the seawater supply apparatus 100c of the embodiment of the present invention, the basic flow paths for organically connecting the individual structures will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

The embodiment of the present invention may further include a seawater supply line L1, a seawater discharge line L2, a circulation connection line L3, a pressure maintaining device connection line L4, and a fluid supply line L5. Valves (not shown) can be provided on each line, and the amount of seawater or fluid supplied can be controlled according to the opening degree of each valve.

The seawater supply line L1, the seawater discharge line L2, the circulation connection line L3 and the pressure maintaining apparatus connection line L4 are connected to the seawater supply apparatuses 100a and 100b according to the first and second embodiments of the present invention, ), So it should be replaced.

The fluid supply line L5 connects the upstream of the seawater inlet SW1 and the nonstop switching valve B8 on the circulating connection line L3 and has a ballast pump 141 and a fluid supply valve B9, By supplying the ballast water supplied through the ballast pump 141 to the circulating connection line L3 so that the seawater flows on the circulation connecting line L3 when the apparatus 100b is operated in the closed loop driving mode, The packing fluid remaining on the circulating connection line L3 can be removed.

Specifically, the fluid supply line L5 connects between the seawater inlet SW1 and the nonstop switching valve B8 on the circulating connection line L3 and the circulation valve B3, and seawater is discharged from the seawater discharge line L2 And supplies the fluid on the circulating connecting line L3 when switching to flow to the circulating connecting line L3.

Here, the point at which the fluid supply line L5 is connected upstream of the nonstop switching valve B8 on the circulating connection line L3 may be located at a position about 5 m lower than the sea level.

 Hereinafter, the individual components that are organically formed by the above-described lines L1 to L5 to implement the seawater supply device 100c will be described.

The ballast pump 141 is provided on the fluid supply line L5 and can supply the fluid to the circulation connection line L3.

Specifically, the ballast pump 141 is provided between the seawater inlet SW1 on the fluid supply line L5 and the fluid supply valve B9, and is connected to a ballast water ballast (ballast water) water is supplied to an arbitrary ballast reservoir (not shown) in the hull H and at the same time when the seawater is switched from the seawater discharge line L2 to the circulating connection line L3, May supply fluid for removing the packing fluid remaining on the circulation connecting line L3 to the circulating connecting line L3 when the apparatus is operated in the closed loop driving mode.

Here, the ballast pump 141 may be a centrifugal type.

The third control unit 172 controls the opening degree of the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the nonstop switching valve B8 and the fluid supply valve B9, When the seawater supply apparatus 100c is switched from the open-loop drive system to the closed-loop drive system, when the sea water is switched from the seawater discharge line L2 to the circulating connection line L3, (Non-Stop).

Here, the third control unit 172 is connected to the third control unit 172 through the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the nonstop switching valve B8, the fluid supply valve B9, Or wirelessly to adjust the opening of each of the valves B1 to B3, B8 and B9.

When the seawater is to be switched from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, The opening of the fluid supply valve B9 is opened and the ballast pump 141 is operated to control the supply of the ballast water to the circulating connection line L3.

Specifically, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, the third control section 172 maintains the open state of the seawater supply valve B1 and the seawater discharge valve B2 Stop switching valve B8 and the circulation valve B3 are kept closed, the fluid supply valve B9 is switched from the closed state to the open state, and the ballast pump 141 is operated Can be controlled.

At this time, the seawater is supplied from the seawater inlet SW1, is discharged to the seawater outlet SW2 through the seawater discharge line L2 through the seawater supply line L1, and is discharged to the ballast pump 141 through the fluid supply line L5. The ballast water flows into the circulation connection line L3 and fills the circulation connection line L3. The packing fluid remaining inside can be pushed by the ballast water and can be removed through the air elimination valve 151. The air elimination valve 151 may be provided on the circulation connection line L3.

That is, without switching off the operation of the seawater pump 140, the seawater supply device 100c can be continuously switched from the open-loop drive mode to the closed-loop drive mode.

The third control unit 172 maintains the fluid supply valve B9 in the open state until the seawater is filled in the circulation connection line L3 and when the seawater is filled in the circulation connection line L3, The valve B1, the seawater discharge valve B2 and the fluid supply valve B9 are closed, the ballast pump 141 is stopped, and the circulation valve B3 and the nonstop switching valve B8 are controlled to be opened .

At this time, the seawater is supplied from the seawater pump 140, flows through the seawater supply line L1 to the circulation connection line L3 through the seawater discharge line L2, and the seawater introduced into the circulation connection line L3 is again And is supplied to the seawater supply line L1 to circulate the seawater in the close loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

Further, in the embodiment of the present invention, by supplying the fluid inside the pressure holding device 130 to the circulation connection line L3, the circulation connection (circulation connection) is established when the seawater supply device 100c is switched from the open- The packing fluid remaining in the line L3 can be removed.

Specifically, the third control unit 172 controls the opening of the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the nonstop switching valve B8, and the pressure holding device supply valve B4 When the seawater is caused to flow from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, Can be implemented.

Here, the third control unit 172 is connected to the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the nonstop switching valve B8, and the pressure holding device supply valve B4 in a wired or wireless manner So that the opening of each of the valves B1 to B4 and B8 can be adjusted.

When the seawater is to be switched from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, The opening of the pressure holding device supply valve B4 may be opened to control the fluid stored in the pressure holding device 130 to be supplied to the circulating connecting line L3.

Specifically, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, the third control section 172 maintains the open state of the seawater supply valve B1 and the seawater discharge valve B2 , The nonstop switching valve B8 and the circulation valve B3 are controlled to be kept closed and the pressure holding device supply valve B4 can be controlled to be switched from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1, is discharged to the seawater outlet SW2 through the seawater discharge line L2 through the seawater supply line L1, and is discharged to the pressure holding device connecting line L4, The fluid stored in the circulation line 130 flows into the circulation connection line L3 to fill the circulation connection line L3. The packing fluid remaining inside can be pushed by the fluid and can be removed through the air elimination valve 151. The air elimination valve 151 may be provided on the circulating connection line L3, where the fluid may be seawater.

That is, without switching off the operation of the seawater pump 140, the seawater supply device 100c can be continuously switched from the open-loop drive mode to the closed-loop drive mode.

The third control unit 172 maintains the pressure maintaining device supply valve B4 in the open state until the seawater is filled in the circulation connection line L3 and when the seawater is filled in the circulation connection line L3, The pressure seawater supply valve B1 and the seawater discharge valve B2 can be closed and the circulation valve B3 and the nonstop switching valve B8 can be controlled to be opened. The pressure maintaining device supply valve B4 maintains the open state even when the seawater is filled in the circulation connection line L3 so that the seawater supply device 100c flows on the circulation connection line L3 even in the closed- The pressure of the seawater can be maintained.

Here, the pressure holding device 130 may be connected to a fire extinguishing water storage tank (not shown) for storing fire extinguishing water to suppress the fire, and the seawater supply device 100c may be connected to the fire extinguishing water storage tank The fire extinguishing water can be supplied from the fire extinguishing water storage tank during the fire extinguishing.

At this time, the seawater is supplied from the seawater pump 140, flows through the seawater supply line L1 to the circulation connection line L3 through the seawater discharge line L2, and the seawater introduced into the circulation connection line L3 is again And is supplied to the seawater supply line L1 to circulate the seawater in the close loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

As described above, in the embodiment of the present invention, when the seawater supply device 100c is switched from the open-loop drive mode to the closed-loop drive mode, the removal of the packing fluid remaining in the circulation line L3 can be stably performed , It is possible to switch the drive system non-stop, and as a result, the supply and return of the regasified liquefied gas to the customer 60 can be smoothly performed.

5 is a conceptual diagram of a seawater supply apparatus according to a fourth embodiment of the present invention.

5, the seawater supply device 100d includes a heat source heat exchanger 110, a heater 120, pressure holding devices 130a, 130b, and 130c, a seawater pump 140, and a fourth control unit 173, .

Here, the heat source heat exchanger 110, the heater 120, and the seawater pump 140 are the same as those described in the seawater supply devices 100a, 100b, and 100c according to the first to third embodiments of the present invention, do.

Before describing the individual configurations of the seawater supply apparatus 100d of the embodiment of the present invention, the basic flow paths for organically connecting the individual structures will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, the pressure maintaining apparatus first connection line L4a, the pressure maintaining apparatus second connection line L4b, The pressure maintaining device third connection line L4c, the first branch line L6, and the second branch line L7. Valves (not shown) can be provided on each line, and the amount of seawater or fluid supplied can be controlled according to the opening degree of each valve.

Here, since the seawater supply line L1 and the seawater discharge line L2 are the same as those described in the seawater supply apparatuses 100a, 100b, and 100c according to the first to third embodiments of the present invention, The first connection line L4a is the same as the pressure maintaining device connection line L4 described in the seawater supply devices 100a, 100b, and 100c according to the first to third embodiments of the present invention.

The pressure maintaining device second connection line L4b connects between the pressure holding device 130b and the heater 120 on the seawater supply line L1 and the heat source heat exchanger 110. When the seawater supply device 100d is closed The seawater stored in the pressure holding device 130b can be supplied to the circulation connecting line L3 when operating in a loop driving manner. Here, the pressure maintaining device second connection line L4b may be connected to the seawater supply line L1 at a position above the sea level by about 30 m above the sea level, and may be provided with the pressure maintaining device second supply valve B4b can do.

The pressure maintaining third connecting line L4c connects the pressure holding device 130c and the line between the nonstop switching valve B8 and the circulating valve B3 on the circulating connecting line L3 at a position higher than the sea level, The seawater supply device 100d can supply the seawater stored in the pressure holding device 130c to the circulating connection line L3 when driven by the closed loop driving method. Here, the pressure maintaining device third connection line L4a can be connected to the circulation connection line L3 at a position above the sea level by about 20 m above the sea level, and is provided with the pressure maintaining device third supply valve B4c can do.

In the embodiment of the present invention, the circulation connection line L3 is the same as that described in the seawater supply devices 100a, 100b, and 100c according to the first to third embodiments of the present invention. However, when the sea water is switched from the seawater discharge line L 2 to the circulation connection line L 30, the circulation connection line L 3 is connected to the seawater discharge line L 1 or the sea water discharge line L 2 There is a slight difference in that the packing fluid remaining in the supply can be removed.

This will be described in detail in the first and second branch lines L6 and L7 and the fourth control section 173 below.

The first branch line L6 branches between the heater 120 on the seawater supply line L1 and the heat source heat exchanger 110 and is connected to the circulation connection line L3 so that the seawater supply device 100d is connected to the open loop When switching from the drive system to the closed loop drive system, at least a part of the seawater flowing on the seawater supply line L1 can be supplied to the circulation connection line L3. The first branch line L6 may include a first branch valve B10 and may be connected to a circulation connection line L3 provided at a position higher than the sea level.

The second branch line L7 branches between the heat source heat exchanger 110 on the seawater discharge line L2 and the point where the circulation connection line L3 is branched on the seawater discharge line L2 and is connected to the circulation connection line L3, And when the seawater supply device 100d is switched from the open loop driving method to the closed loop driving method, at least a part of the seawater flowing on the seawater supply line L1 may be supplied to the circulating connection line L3. Here, the second branch line L7 may include the second branch valve B11 and may be connected to the circulation connecting line L3 provided at a position higher than the sea level.

Hereinafter, the individual components that are organically formed by the above-described lines L1 to L4, L6, and L7 and implement the seawater supply device 100d will be described.

The pressure holding device 130a is connected to a line provided at a position lower than the sea level between the nonstop switching valve B8 and the circulation valve B3 on the circulating connecting line L3 through a first pressure holding line L4a And when the seawater supply device 100d is driven by the closed loop driving method, the first supply valve B4a of the pressure holding device is opened and the flow of the seawater flowing on the circulation connecting line L3 by the fluid stored therein The pressure can be maintained.

At this time, the pressure maintaining device 130a is constructed of a container which is located at a position about 35m higher than the sea level and whose upper side is open to communicate with the atmosphere, and the pressure of the seawater can be maintained by using the atmospheric pressure.

That is, in the embodiment of the present invention, the pressure maintaining device 130a, which is located about 35 m higher than the sea level, is connected to the circulation connecting line L3 located at about 5 m lower than the sea level, The pressure of the seawater flowing into the seawater pump 140 can be compensated by using the circulation line L3, the seawater supply line L1 and the seawater discharge line L2 The pressure of circulating seawater can be kept constant.

The pressure holding device 130b may be connected between the heater 120 on the seawater supply line L1 and the heat source heat exchanger 110 via the pressure maintaining device second connection line L4b, The second supply valve B4b may be opened to maintain the pressure of the seawater flowing on the seawater supply line L1 with the fluid stored therein.

At this time, the pressure holding device 130b is composed of a vessel which is located at a position about 35m higher than the sea level and whose upper side is opened to communicate with the atmosphere, so that the pressure of the seawater can be maintained by using the atmospheric pressure, The seawater supply line L1 connected to the sea level L4b may be positioned approximately 30 meters higher than the sea level.

That is, in the embodiment of the present invention, the pressure holding device 130b, which is located about 35 meters higher than the sea level, is connected to the sea water supply line L1 located at about 30 meters higher than the sea level, The seawater supply line L1, the seawater discharge line L2, the seawater discharge line L1, and the seawater discharge line L2 can be compensated using the pressure of the seawater discharged from the heat source heat exchanger 110, The pressure of the circulating sea water can be kept constant.

Accordingly, in this case, the length of the pressure maintaining device first connection line L4a is considerably reduced compared to the length of the pressure maintaining device first connection line L4a.

The pressure holding device 130c is provided between the heat source heat exchanger 110 on the seawater discharge line L2 and the nonstop changeover valve B8 on the circulation connection line L3 and the circulation valve B3, The third supply line B4c may be connected to the third line L4c through the pressure maintaining device, and when the seawater supply device 100d is driven by the closed-loop driving method, It is possible to maintain the pressure of the seawater flowing on the circulation connecting line L3 with the stored fluid.

At this time, the pressure holding device 130c is constituted by a vessel which is located at a position about 35 m higher than the sea level and opened to communicate with the atmosphere, and the pressure of the seawater can be maintained by using the atmospheric pressure, The circulation connection line L3 connected to the fourth line L4c may be located approximately 20 m higher than the sea level.

That is, in the embodiment of the present invention, the pressure maintaining device 130c, which is located about 35 meters higher than the sea level, is connected to the circulation connecting line L3 located about 20 meters higher than the sea level, (L3), the seawater supply line (L1), and the seawater discharge line (L2) by using the pressure of the seawater discharged from the seawater pump (140) The pressure of the circulating seawater can be kept constant.

Therefore, in this case, the length of the first connection line L4a is reduced compared with the length of the first connection line L4a, which reduces the construction cost.

The fourth control unit 173 is provided with a seawater supply valve B1, a seawater discharge valve B2, a circulation valve B3, a nonstop switching valve B8, a first branch valve B10 and a second branch valve B11, When the sea water supply device 100d is switched from the open-loop drive mode to the closed-loop drive mode, when the sea water is switched from the sea water discharge line L2 to the circulation connection line L3, -Stop).

Here, the fourth control unit 173 controls the first and second branch valves B11, B11, B11, B11, B12, And the opening degree of each of the valves B1 to B3, B8, B10 and B11 can be adjusted.

The fourth control unit 173 controls the operation of the seawater supply device 100d without control of the first branch valve B10 and the second branch valve B11 when the seawater supply device 100d is switched from the open- B1, the seawater discharge valve B2, the circulation valve B3, and the nonstop switching valve B8.

That is, when the seawater supply device 100d is switched from the open-loop drive mode to the closed-loop drive mode, the fourth control section 173 opens at least the circulation valve B3 to discharge at least one of the seawater discharged into the seawater discharge line L2 It is possible to control some of them to be supplied to the circulation connection line L3.

Specifically, when the seawater supply apparatus 100d is switched from the open-loop drive system to the closed-loop drive system, the fourth control unit 173 sets the seawater supply valve B1 and the seawater discharge valve B2 to the open state Stop switching valve B8 to maintain the closed state, and to control the switching of the circulation valve B3 from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1, passes through the seawater supply line L1, is discharged to the seawater outlet SW2 through the seawater discharge line L2, and at least part of the seawater passing through the seawater discharge line L2 Is introduced into the circulating connection line L3 to fill the circulating connection line L3 with the seawater and the packing fluid remaining on the circulating connection line L3 can be removed through the air elimination valve 151. [

That is, the seawater supply device 100d can be continuously switched from the open-loop drive mode to the closed-loop drive mode without stopping the operation of the seawater pump 140. [

The fourth control unit 173 keeps the circulation valve B3 open at the moment when the seawater is filled in the circulation connection line L3 while the seawater supply valve B1 and the seawater discharge valve B2 are closed And the nonstop switching valve B8 is opened.

At this time, the seawater is supplied from the seawater pump 140, flows into the circulating connection line L3 through the seawater discharge line L2 through the seawater supply line L1, and the seawater introduced into the circulating connection line L3 flows into the seawater And then supplied to the supply line L1 to circulate the seawater in the closed loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

When the seawater supply device 100d is switched from the open loop drive mode to the closed loop drive mode, the fourth control section 173 controls the flow of the seawater supply valve B1, the seawater discharge valve B1, Only the first branch valve B2, the first branch valve B10, and the nonstop switching valve B8 can be controlled.

That is, when the seawater supply device 100d is switched from the open-loop drive mode to the closed-loop drive mode, the fourth control section 173 opens the first branch valve B10 to open the first branch valve B10 in the seawater supply line L1, It is possible to control at least a part of the seawater supplied to the circulation line L3 to be supplied to the circulation line L3.

Specifically, when the seawater supply apparatus 100d is switched from the open-loop drive system to the closed-loop drive system, the fourth control unit 173 sets the seawater supply valve B1 and the seawater discharge valve B2 to the open state And the circulation valve B3 and the nonstop switching valve B8 are controlled to maintain the closed state and can control to switch the first branch valve B10 from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1 and discharged to the seawater outlet SW2 through the seawater supply line L1 through the seawater discharge line L2, and at the same time, at least part of the seawater passing through the seawater supply line L1 Is introduced into the circulating connection line L3 to fill the circulating connection line L3 with the seawater and the packing fluid remaining on the circulating connection line L3 can be removed through the air elimination valve 151. [

That is, the seawater supply device 100d can be continuously switched from the open-loop drive mode to the closed-loop drive mode without stopping the operation of the seawater pump 140. [

The fourth control section 173 opens the circulation valve B3 and the nonstop switching valve B8 at the moment when the seawater is filled in the circulation connection line L3 and controls the seawater supply valve B1 and the seawater discharge valve B2, And closes the first branch valve B10.

At this time, the seawater is supplied from the seawater pump 140, flows into the circulating connection line L3 through the seawater discharge line L2 through the seawater supply line L1, and the seawater introduced into the circulating connection line L3 flows into the seawater And then supplied to the supply line L1 to circulate the seawater in the closed loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

When the seawater supply apparatus 100d is switched from the open-loop drive system to the closed-loop drive system, the fourth control unit 173 controls the operation of the seawater supply valve B1, (B2), the second branch valve (B11), and the nonstop switching valve (B8).

That is, when the seawater supply device 100d is switched from the open loop drive mode to the closed loop drive mode, the fourth control section 173 opens the second branch valve B11 and is discharged to the seawater discharge line L2 It is possible to control at least a part of the seawater to be supplied to the circulation connection line L3.

Specifically, when the seawater supply apparatus 100d is switched from the open-loop drive system to the closed-loop drive system, the fourth control unit 173 sets the seawater supply valve B1 and the seawater discharge valve B2 to the open state And the circulation valve B3 and the nonstop switching valve B8 are controlled to be kept closed and the second branch valve B11 can be controlled to be switched from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1, passes through the seawater supply line L1, is discharged to the seawater outlet SW2 through the seawater discharge line L2, and at least part of the seawater passing through the seawater discharge line L2 Is introduced into the circulating connection line L3 to fill the circulating connection line L3 with the seawater and the packing fluid remaining on the circulating connection line L3 can be removed through the air elimination valve 151. [

That is, the seawater supply device 100d can be continuously switched from the open-loop drive mode to the closed-loop drive mode without stopping the operation of the seawater pump 140. [

The fourth control section 173 opens the circulation valve B3 and the nonstop switching valve B8 at the moment when the seawater is filled in the circulation connection line L3 and controls the seawater supply valve B1 and the seawater discharge valve B2, And closes the second branch valve B11.

At this time, the seawater is supplied from the seawater pump 140, flows into the circulating connection line L3 through the seawater discharge line L2 through the seawater supply line L1, and the seawater introduced into the circulating connection line L3 flows into the seawater And then supplied to the supply line L1 to circulate the seawater in the closed loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

As described above, in the embodiment of the present invention, when the seawater supply apparatus 100d is switched from the open loop drive system to the closed loop drive system, the removal of the packing fluid remaining in the circulation connection line L3, that is, , It is possible to switch the drive system non-stop, and as a result, the supply and return of the regasified liquefied gas to the customer 60 can be smoothly performed.

6 is a conceptual diagram of a seawater supply apparatus according to a fifth embodiment of the present invention.

6, the seawater supply device 100e includes a heat source heat exchanger 110, a heater 120, a pressure holding device 130b, a seawater pump 140, a low pressure pump 142, 174).

Here, the heat source heat exchanger 110, the heater 120, the pressure holding device 130b, and the seawater pump 140 are installed in the seawater supply devices 100a, 100b, 100c, and 100d according to the first to fourth embodiments of the present invention, And so on.

Before describing the individual configurations of the seawater supply device 100e of the embodiment of the present invention, the basic flow paths for organically connecting the individual configurations will be described. Here, the passage is a passage through which the fluid flows, and may be a line. However, the present invention is not limited thereto.

In the embodiment of the present invention, the apparatus may further include a seawater supply line L1, a seawater discharge line L2, a circulation connection line L3, and a pressure maintaining device second connection line L4b. Valves (not shown) can be provided on each line, and the amount of seawater or fluid supplied can be controlled according to the opening degree of each valve.

The seawater supply line L1, the seawater discharge line L2 and the pressure maintaining device second connection line L4b are connected to the seawater supply apparatuses 100a, 100b, 100c and 100d according to the first to fourth embodiments of the present invention, And so on.

In the embodiment of the present invention, the circulation connection line L3 is the same as that described in the seawater supply devices 100a, 100b, and 100c according to the first to third embodiments of the present invention. However, there is a slight difference in that a portion where the circulation connecting line L3 is connected to the seawater supply line L1 is between the seawater pump 140 and the heater 120. [ The low pressure pump 142 and the fifth control unit 174 will be described in detail.

Hereinafter, the individual components that are organically formed by the above-described lines L1 to L4b to implement the seawater supply device 100e will be described.

The low pressure pump 142 is provided on the circulation connection line L3 to pressurize the seawater with a pressurizing capacity smaller than that of the seawater pump 140. The seawater is discharged from the seawater discharge line L2, (L3), so that the seawater can be supplied to the heat source heat exchanger 110 after the seawater is pressurized to a low pressure.

Specifically, the low-pressure pump 142 is operated when switching the seawater to flow from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100e is switched from the open-loop driving mode to the closed- When operating in the closed loop driving mode, the seawater flowing into the circulation connecting line L3 through the seawater discharge line L2 can be pressurized to a low-pressure heat source heat exchanger 110. [

That is, in the embodiment of the present invention, the seawater supply device 100e presses the seawater through the seawater pump 140 to supply it to the heat source heat exchanger 110 when the seawater supply device 100e is driven by the open- The seawater can be pressurized through the low pressure pump 142 and supplied to the heat source heat exchanger 110. The low pressure pump 142 may be of a centrifugal type.

In the embodiment of the present invention, the seawater pump 140 does not change the pressure of the seawater discharged even when the seawater supply device 100e switches from the open-loop drive system to the closed-loop drive system. Accordingly, when seawater flows in the closed loop space, the head of the seawater is removed, so that much pressure through the seawater pump 140 is not required.

That is, the seawater pump 140 compensates for the pressure loss due to the internal resistance of the apparatus using seawater, for example, the heater 120 or the heat source heat exchanger 110 in the closed loop driving system. The pressure is excessively introduced into the heater 120 or the heat source heat exchanger 110 to cause vibration and noise.

In order to solve this problem, in the embodiment of the present invention, the low pressure pump 142 is provided separately from the seawater pump 140 so that the seawater pump 140 is used in the open loop driving system, Is driven to solve vibration and noise problems.

Accordingly, in the embodiment of the present invention, a low-pressure pump 142 driven separately from the seawater pump 140 is provided to supply seawater having an appropriate pressure to the heat source heat exchanger 110, thereby reducing vibration and noise .

The fifth control unit 174 adjusts the opening degree of the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3 and the switching valve B12, and controls the opening of the seawater pump 140 and the low- When the sea water supply apparatus 100e is switched from the open-loop drive system to the closed-loop drive system, when the sea water is switched from the sea water discharge line L2 to the circulation connection line L3, -Stop).

Here, the fifth control unit 174 is connected to the fifth control unit 174 through the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the switching valve B12, the seawater pump 140 and the low- To control the opening of each of the valves B1 to B3 and B12 and to control the operation of the pumps 140 and 142. [

The fifth control unit 174 controls the flow of the seawater from the seawater discharge line L2 to the circulating connection line L3 when the sea water supply device 100e is switched from the open loop drive mode to the closed loop drive mode, The opening of the circulation valve B3 may be opened to control at least a part of the seawater discharged into the seawater discharge line L2 to be supplied to the circulation connection line L3.

More specifically, when the seawater supply device 100e is switched from the open-loop drive mode to the closed-loop drive mode, the fifth control section 174 sets the open state of the seawater supply valve B1 and the seawater discharge valve B2 , The switching valve B12 is controlled to be kept closed, and the circulation valve B3 can be controlled to be switched from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1, passes through the seawater supply line L1, is discharged to the seawater outlet SW2 through the seawater discharge line L2, and at least part of the seawater passing through the seawater discharge line L2 Is introduced into the circulating connection line L3 to fill the circulating connection line L3 with the seawater and the packing fluid remaining on the circulating connection line L3 can be removed through the air elimination valve 151. [

The fifth control unit 174 maintains the circulation valve B3 in an opened state at the moment when the seawater is filled in the circulation connection line L3, while the seawater supply valve B1 and the seawater discharge valve B2 are closed And opens the switching valve B12, so that the seawater pump 140 can be shut down and the low-pressure pump 142 can be operated.

At this time, the seawater flows into the circulation connection line L3 through the seawater supply line L1 through the seawater discharge line L2, and the seawater introduced into the circulation connection line L3 flows through the low pressure pump 142 to the low pressure Pressurized and supplied to the seawater supply line L1, and the seawater circulates in the closed loop. That is, the seawater is continuously circulated to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1.

Accordingly, in the embodiment of the present invention, a low-pressure pump 142 driven separately from the seawater pump 140 is provided to supply seawater having an appropriate pressure to the heat source heat exchanger 110, thereby reducing vibrations and noise .

7 is a conceptual diagram of a seawater supply apparatus according to a sixth embodiment of the present invention.

7, the seawater supply device 100f includes a heat source heat exchanger 110, a first heater 120a, a second heater 120b, a pressure holding device 130, a seawater pump 140, 6 < / RTI >

Here, the heat source heat exchanger 110, the pressure holding device 130, and the seawater pump 140 are the same as those described in the seawater supply devices 100a to 100e according to the first to fifth embodiments of the present invention, do.

The first heater 120a is provided between the heat source heat exchanger 110 on the seawater supply line L1 and the seawater pump 140 and may be disposed at a position higher than the sea level by about 30 m above the sea level.

The first heater 120a supplies the seawater to the heat source heat exchanger 110 through the seawater supply line L1 and heats the seawater supplied to the heat source heat exchanger 110. When the seawater supply device 100f is driven by the closed- have. That is, the temperature of the seawater can be heated when the temperature of the seawater is too low to allow the heat source heat exchanger 110 to transmit the necessary heat source as the intermediate heat.

At this time, the first heater 120a is connected to the steam line STL from a boiler (not shown) to heat the seawater by receiving a heat source such as steam, It may be a heater. Here, the first heater 120a is connected in series through a second heater 120b and a steam line STL, which will be described later, and can be driven by one heat source, that is, one steam heat source.

The second heater 120b may be disposed on the circulation connection line L3 at a position higher than the sea level by about 20m from the sea level surface and may heat seawater flowing on the circulation connection line L3 .

The second heater 120b supplies seawater to the heat source heat exchanger 110 through the seawater discharge line L2 to be heated when the seawater supply device 100f is driven by the closed loop driving method have. That is, the temperature of the seawater can be heated when the temperature of the seawater is too low to allow the heat source heat exchanger 110 to transmit the necessary heat source as the intermediate heat.

At this time, the second heater 120b is connected in series through the first heater 120a and the steam line (STL) to receive the heat source such as steam to heat the seawater. However, It may be a heater.

That is, the second heater 120b can share the heat source with the first heater 120a, and the seawater is heated by the first heater 120a and the remaining heat source of the steam is finally extracted from the second heater 120b So that the energy efficiency can be maximized.

The sixth control unit 175 controls the opening degree of the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3 and the nonstop switching valve B8 and controls the operation of the second heater 120b So that the seawater supply device 100f can optimize and use the energy when switching from the open-loop drive mode to the closed-loop drive mode, when the sea water is switched from the seawater discharge line L2 to the circulating connection line L3 Can be controlled.

Here, the sixth control unit 175 is connected to the seawater supply valve B1, the seawater discharge valve B2, the circulation valve B3, the nonstop switching valve B8 and the second heater 120b in a wired or wireless manner, It is possible to control the opening of the valves B1 to B3 and B8 of the second heater 120b and to control the operation of the second heater 120b.

When the seawater is to be switched from the seawater discharge line L2 to the circulating connection line L3, that is, when the seawater supply device 100f is switched from the open-loop drive mode to the closed-loop drive mode, The opening of the circulation valve B3 may be opened to control at least a part of the seawater discharged into the seawater discharge line L2 to be supplied to the circulation connection line L3.

Specifically, when the seawater supply apparatus 100f is switched from the open-loop drive system to the closed-loop drive system, the sixth control unit 175 sets the open state of the seawater supply valve B1 and the seawater discharge valve B2 Stop switching valve B8 to maintain the closed state, and to control the switching of the circulation valve B3 from the closed state to the open state.

At this time, the seawater is supplied from the seawater inlet SW1, passes through the seawater supply line L1, is discharged to the seawater outlet SW2 through the seawater discharge line L2, and at least part of the seawater passing through the seawater discharge line L2 Is introduced into the circulating connection line L3 to fill the circulating connection line L3 with the seawater and the packing fluid remaining on the circulating connection line L3 can be removed through the air elimination valve 151. [

The sixth control unit 175 keeps the circulation valve B3 open at the moment the seawater is filled in the circulation connection line L3 while closing the seawater supply valve B1 and the seawater discharge valve B2 Stop switching valve B8 is opened and the temperature of the seawater is measured by the seawater temperature measuring sensor 180 to control the second heater 120b to operate when the temperature of the seawater is lower than the predetermined temperature.

The seawater temperature measurement sensor 180 may be provided on the circulation connection line L3 and may be connected to the sixth control unit 175 by wire or wirelessly to transmit the temperature information of the seawater to the sixth control unit 175 .

At this time, the seawater flows into the circulation connection line L3 through the seawater supply line L1 through the seawater discharge line L2, and the seawater introduced into the circulation connection line L3 is supplied again to the seawater supply line L1 And the seawater circulates in the close loop. That is, the seawater circulates continuously to the seawater supply line L1, the seawater discharge line L2, the circulation connection line L3, and the seawater supply line L1, and the appropriate temperature is continuously supplied to the heat source heat exchanger 110 Supply can be performed.

Accordingly, in the embodiment of the present invention, it is possible to supply the heat source continuously to the heat source heat exchanger 110 regardless of the temperature of the seawater, and the second heater 120b, in addition to the first heater 120a, It is possible to economically consume the energy by heating the sea water while sharing the heat source of the heat source.

The consumer 60 can supply and consume the liquefied gas vaporized by the vaporizer 50. Here, the customer 60 may be a land terminal installed on the land or a maritime terminal floated on the sea, by vaporizing the liquefied gas and supplying the liquefied gas in the gas phase.

As described above, the ship having the gas regeneration system 1 according to the present invention has the effect of maximizing the regeneration efficiency of the liquefied gas.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: vessel equipped with a gas regeneration system 10: liquefied gas storage tank
20: Feeding pump 30: Re-condenser
40: booster pump 50: vaporizer
60: customer demand 100: sea water supply device
100a to f: Seawater supply device 110: Heat source heat exchanger
120: heater 120a: first heater
120b: second heater 130: pressure holding device
130a-c: Pressure holding device 140: Seawater pump
141: Ballast pump 142: Low pressure pump
151: air removing valve 160: orifice
161: Sea water shutoff valve 162: Bypass valve
170: first control section 171: second control section
172: third control unit 173: fourth control unit
174: fifth control unit 175: sixth control unit
L1: Sea water supply line L2: Sea water discharge line
L3: Circular connection line L3a: Circular connection line
L3b: Middle tank bypass line L4: Pressure maintaining device connection line
L4a: Pressure maintaining device first connection line L4b: Pressure maintaining device second connection line
L4c: pressure maintaining device third connection line L5: fluid supply line
L6: First branch line L7: Second branch line
L8: Orifice bypass line B1: Seawater inflow valve
B2: seawater outlet valve B3: circulation valve
B4: pressure holding device supply valve B4a: pressure holding device first supply valve
B4b: pressure maintaining device second supply valve B4c: pressure holding device third supply valve
B5: intermediate tank bypass valve B6: intermediate tank supply valve
B7: Medium tank discharge valve B8: Nonstop switching valve
B9: fluid supply valve B10: first branch valve
B11: Second branch valve B12: Switch valve
SW1: Seawater inlet SW2: Seawater outlet
GWL: Heat source circulation line GWP: Heat source pump
E: Engine S: Propeller shaft
P: Propeller H: Hull
RL: Liquefied gas supply line

Claims (12)

A ship having a gas regeneration system including a regeneration device for regenerating liquefied gas through seawater supplied by a seawater supply device,
The seawater supply device includes:
A seawater supply line supplying the seawater to the regeneration device;
A seawater discharge line for discharging the seawater from the regasification apparatus;
A circulation connection line branched from the seawater discharge line and connecting the seawater supply line;
A first open / close valve disposed closer to a point where the water supply line on the circulation connection line is connected to the seawater supply line;
A second open / close valve disposed closer to the branching point of the seawater discharge line on the circulation connection line;
A pressure holding device provided on the circulation connection line and maintaining the pressure of seawater flowing in the circulation connection line; And
And a pressure holding device connecting line connecting the pressure holding device and the first opening / closing valve on the circulation connecting line and the second opening / closing valve,
The pressure maintaining device connection line may include:
And supplies the fluid inside the pressure maintaining device on the circulating connection line when the seawater is switched from the seawater discharge line to the circulation connection line. The method according to claim 1,
Further comprising a seawater pump provided on the seawater supply line for supplying the seawater to the regenerator,
The seawater pump includes:
Wherein the vessel is located lower than the sea level. 3. The method of claim 2,
A third opening / closing valve provided upstream of the seawater pump on the seawater supply line;
A fourth open / close valve provided downstream of a branch point of the circulation connection line on the seawater discharge line;
A pressure holding fluid supply valve provided on the pressure holding device connecting line; And
And a controller for adjusting the opening degree of the first to fourth open / close valves and the pressure holding fluid supply valve to implement the non-stop operation when switching the seawater to flow from the seawater discharge line to the circulation connection line And a gas regeneration system. The apparatus of claim 3,
Wherein the controller controls to open the pressure holding fluid supply valve to supply the fluid to the circulation connecting line when switching the seawater to flow from the seawater discharge line to the circulation connecting line Ship. 5. The apparatus of claim 4,
And closes the third and fourth open / close valves when the fluid is filled on the circulation connecting line, and controls the first and second open / close valves to be opened. The pressure control apparatus according to claim 1,
Wherein the atmospheric pressure is used to maintain the pressure of the seawater. 2. The apparatus according to claim 1, wherein the fluid in the pressure-
Wherein the vessel is a seawater. The method according to claim 1,
Further comprising a fire-extinguishing water storage tank for storing fire-fighting water,
The pressure holding device includes:
Wherein the fire extinguishing water storage tank is connected to the fire extinguishing water storage tank for fire fighting. The fire extinguishing water storage tank according to claim 8,
Wherein when the seawater is switched from the seawater discharge line to the circulation connection line, the digestion water stored therein is supplied to the pressure maintaining device. 2. The apparatus of claim 1,
And a vaporizer for directly vaporizing the liquefied gas with the seawater. 2. The apparatus of claim 1,
A vaporizer for vaporizing the liquefied gas with intermediate heat; And
And a heat source heat exchanger for supplying the heat source of the seawater to the intermediate fruit. 5. The method of claim 4,
Wherein the first on-off valve is a nonstop switching valve, the second on-off valve is a circulation valve, the third on-off valve is a seawater supply valve, the fourth on- , And a third control unit.

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