KR20190011552A - Regasification System of liquefied Gas and ship having the same - Google Patents

Abstract

The present invention relates to a liquefied gas regasification system and a ship having the same, including at least one liquefied gas storage tank storing liquefied gas in a hull; a copper dam installed adjacent to the liquefied gas storage tank; a regasification unit installed on the hull to evaporate the liquefied gas; a pump pressurizing seawater toward the regasification unit; a main line interconnecting the regasification unit and the pump for circulation of the seawater and passing through the copper dam; and a sub line branching from one region of the main line to merge with the other region. Seawater is circulated through the sub line during repair and maintenance of the main line. The main line is provided with at least one main segment part separably coupled to at least a region positioned in the copper dam.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas regeneration system,

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

BACKGROUND ART Recently, as environmental regulations and the like have been strengthened, the use of liquefied natural gas (hereinafter referred to as liquefied natural gas), which is close to an environmentally friendly fuel among various fuels, is increasing. Liquefied gases are generally transported through a liquefied gas carrier and are stored in a tank of the liquefied gas carrier in a liquid state at temperatures below -163 ° C below 1 atmospheres. When the LNG is in the liquid state, the volume of the LNG is reduced to one-sixth of that of the gaseous state, thereby increasing the transportation efficiency.

However, the liquefied gas is generally consumed in a gaseous state rather than in a liquid state, and the liquefied gas stored and transported in the liquid storage tank of the ship is regenerated by using the regeneration facility. At this time, the regeneration facility may be mounted on a ship such as LNG carrier, FLNG, FSRU, or the like, and the regeneration facility implements rejuvenation by heating the liquefied gas using a heat source such as seawater.

The regeneration system includes a regeneration section on the deck of the hull, the regeneration section and the storage tank storing the liquefied gas are connected by a plurality of pipes, and the plurality of pipes are provided in a cofferdam.

However, since a plurality of pipes connecting the regeneration unit and the storage tank are integrally provided, it is difficult to maintain the pipe, and when maintenance is required, the entire regeneration facility must be shut down .

SUMMARY OF THE INVENTION It is an object of the present invention to at least partially solve the problems in the conventional art by providing a main line connecting a pump for pressurizing seawater and a regeneration unit, And a ship having the liquefied gas regeneration system.

Another object of the present invention is to provide a liquefied gas regeneration system and a ship having the liquefied gas regeneration system capable of allowing seawater to flow through a sub line when main line maintenance is required by having a sub line connected to the main line .

A liquefied gas regeneration system according to an embodiment of the present invention includes at least one liquefied gas storage tank for storing liquefied gas inside a hull; A coffer dam disposed adjacent to the liquefied gas storage tank; A regeneration unit installed on the hull to vaporize the liquefied gas; A pump for pressurizing the seawater toward the regeneration unit; A main line connecting the regeneration unit and the pump to flow the seawater and passing through the coffer dam; And a sub line branched from one area of the main line and provided to be merged into another area, wherein the sub line flows during maintenance of the main line, and the main line flows through at least the copper And at least one main segment which is detachably coupled to an area located inside the dam.

Specifically, the cofferdams may be provided between the side shell plates on both sides of the hull and the liquefied gas storage tanks.

Specifically, the sub line may be provided such that one end thereof branches from the upstream of the part separable by the main segment part in the main line, and the other end joins the downstream part of the separable part by the main segment part.

Specifically, the sub line may be branched from the main line whose one end is located on the upper portion of the hull, and the other end is joined to the main line adjacent to the pump.

Specifically, the main line may further include a bent portion bent from the upper portion of the hull toward the reground portion.

Specifically, one end of the sub line may be branched from an area past the bent portion of the main line.

Specifically, at the other end of the sub line, an opening / closing member for controlling the opening / closing of the sub line may be further provided.

Specifically, the opening and closing member may include a spectacle flange.

Specifically, the sub-line may further include at least one sub-segment that is detachably coupled.

Specifically, each of the main segment and the sub segment may include at least one lifting lug.

Specifically, the upper portion of the hull and the coffer dam may be provided with openings through which the main line and the sub line pass, respectively.

Specifically, the opening may be larger than an outer diameter of each of the main line and the sub line.

A ship according to another embodiment of the present invention is characterized in that it comprises the at least one liquefied gas regeneration system.

The liquefied gas regeneration system according to the present invention and the ship having the liquefied gas regeneration system according to the present invention are provided with a main line connecting the pump for pressurizing seawater and the regeneration section at least in a detachable manner inside the coffer dam, By being separable, the convenience of operation can be improved and the cost can be reduced.

The liquefied gas regeneration system according to the present invention and the ship having the liquefied gas regeneration system according to the present invention are provided with a sub line connected to the main line to allow the seawater to flow through the sub line when maintenance of the main line is required, The regeneration unit can be continuously operated without stopping, and the efficiency of the regeneration unit can be improved.

1 is a view showing a ship according to an embodiment of the present invention.
FIG. 2 is a view showing a line through which seawater flows in the regeneration facility according to an embodiment of the present invention.
FIG. 3 is a view showing a line exposed to the upper part of the ship in FIG. 2. FIG.
Fig. 4 is a view showing a line located inside the copper dam in Fig. 2. Fig.
5 is a cross-sectional view showing A-A 'in Fig.

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, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, it is to be noted that, in addition to the merchant ships that transport cargo from its origin to its destination, the following is a concept covering maritime structures that float at certain points in the sea and perform specific operations.

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

1 is a view showing a ship according to an embodiment of the present invention.

Referring to Figure 1, a vessel 100 according to an embodiment of the present invention includes at least one liquefied gas storage tank 11, 12, 13, 14, a liquefied gas storage tank 11, 12, 13, 14 A pump 40 for pressurizing the seawater, a regeneration unit 20 for vaporizing the liquefied gas, a regeneration unit 20 and a pump 40, And includes a main line 21 and a sub-line 22 passing through the coffer dam 50.

A ship or an offshore structure according to an embodiment of the present invention may be a ship, a special vessel, and an offshore structure provided with a regeneration unit 20 for regenerating liquefied gas.

Such a vessel or offshore structure may be, for example, a floating storage and regasification unit (FSRU) and a regasification vessel (RV). The LNG RV is a LNG regasification facility installed on a liquefied gas carrier capable of self-propulsion and floating, and the LNG FSRU stores liquefied gas unloaded from LNG transportations offshore at sea, in a liquefied gas storage tank, It is an offshore structure that vaporizes the liquefied gas and supplies it to the customers on land.

As shown in FIG. 1, a plurality of liquefied gas storage tanks 11, 12, 13, and 14 may be provided in the hull 10. Liquefied gas can be stored in each of these liquefied gas storage tanks 11, 12, 13, 14 at a pressure of about 1 bar.

Between the plurality of liquefied gas storage tanks 11, 12, 13 and 14 and between the side outer plates on both sides of the ship 10 and the liquefied gas storage tanks 11, 12, 13 and 14, a coffer dam 50 ) Can be installed. Although not shown in the drawings, the coffer dam 50 may include a longitudinal coffer dam and a transverse coffer dam, and a plurality of liquefied gas storage tanks 11, 12, 13 , 14) can be separated and accommodated.

Since the liquefied gas is stored in the liquefied gas storage tanks 11, 12, 13 and 14 at a temperature of about -163 DEG C, it must have a structure capable of withstanding brittle fracture in a cryogenic environment. The liquefied gas storage tanks 11, 12, 13 and 14 are surrounded by the coffer dam 50 to separate the liquefied gas storage tanks 11, 12, 13 and 14, , 12, 13, 14) at a predetermined temperature or higher can be prevented from being brittle fractured by the liquefied gas.

At this time, a liquefied gas pump 70 is provided in each of the liquefied gas storage tanks 11, 12, 13 and 14 so that the liquefied gas can be supplied to the regeneration unit 20 along the liquefied gas supply line 60 . Then, the pump 40 pressurizes the seawater introduced from the seed chest (not shown) and flows to the regeneration unit 20 to heat the liquefied gas.

The regeneration section 20 can be installed on the upper portion of the hull 10 and can vaporize the liquefied gas supplied from the liquefied gas pump 70. As described above, in the regeneration section 20, the seawater is heat-exchanged with the liquefied gas, thereby providing the heat of vaporization to the liquefied gas and vaporizing the liquefied gas. The vaporized liquefied gas can be supplied to the customer, and the customer can be an engine or turbine producing energy, or a final consumer such as city gas or general household.

Since the liquefied gas has a cryogenic temperature of -163 ° C at normal pressure, it evaporates even if the temperature of the liquefied gas is slightly higher than -163 ° C at normal pressure. The seawater can be a sufficient heat source to vaporize the liquefied gas and can be used as a heat source in regeneration of the liquefied gas because it is easy to take in water from offshore vessels or offshore structures.

In addition, the regeneration unit 20 can heat the liquefied gas using various fruits in addition to seawater. The liquefied gas can be heated by using the glycol water which is free from corrosion of the heat exchanger, piping, and the like.

At this time, the regeneration unit 20 and the pump 40 can be connected by the main line 21 in which the seawater flows, and the main line 21 can be arranged to pass through the coffer dam 50. The main line 21 may include a main supply line 21a to which seawater is supplied and a main discharge line 21b to which seawater is discharged. The main line 21 according to an embodiment of the present invention may include at least one main segment 25 (see FIG. 2). The main segment 25 may be located within the copper dam 50 And may be provided in one area of the main line 21. When maintenance of the main line 21 is required, a separate sub line 22 may be connected to the main line 21 so that the regeneration unit 20 can continue to operate without stopping.

The sub-line 22 may be provided so as to branch from the upstream of the main-line separable portion 25 in the main line 21 and to merge downstream of the detachable portion by the main segment 25 . At this time, the sub line 22 may be provided with a sub supply line 22a connected to the main supply line 21a and a sub discharge line 22b connected to the main discharge line 21b.

Whereby only a part of the main supply line 21a or the main discharge line 21b that requires maintenance can be separately maintained and the seawater can be moved through the sub supply line 22a or the sub discharge line 22b , The re-ignition unit 20 can be continuously operated, and the efficiency of the re-ignition unit 20 can be improved.

In addition, the cofferdam 50 may be provided with a drain (not shown). The drain portion can be provided on the lower side of the coffer dam 50 through which the main line 21 and the sub line 22 pass, and it is confirmed that the seawater is leaked. At this time, a sensor (not shown) may be additionally attached to the drain portion. When the seawater is leaked, the sensor may sense the leak and generate a leak signal by an alarm or the like. Accordingly, when leakage water generated in the main line 21 is confirmed, the seawater flowing into the main line 21 is blocked, and the regeneration unit 20 can be continuously operated by allowing the seawater to flow into the sub line 22 have.

FIG. 2 is a view showing a line through which seawater flows in the regeneration facility according to an embodiment of the present invention, and FIG. 3 is a view showing lines exposed to the upper part of the ship in FIG.

1 and 2, a main line 21 constituting a liquefied gas regeneration system according to an embodiment of the present invention includes a main damper 22 for connecting the pump 40 and the regulator 20, (Not shown). At this time, the pump 40 may be provided outside the liquefied gas storage tanks 11, 12, 13 and 14, and the reground portion 20 may be provided in the deck which is the upper portion of the ship 10.

The main line 21 is used as a passage through which the seawater is supplied from the pump 40 to the regeneration section 20 or the seawater is discharged after the heat exchange. The maintenance operation was continued after stopping the operation of the regulator section 20. However, in the present invention, when the main line 21 is maintained by providing the sub line 22 connected to the main line 21, the seawater flows to the sub line 22, The cost can be saved by continuing operation.

At this time, the main line 21 may be detachably coupled to the plurality of main segment portions 25. [ Since the main segment 21 is provided in the main line 21 located at least inside the coffer dam 50, when the main line 21 located in the coffer dam 50 is replaced, So that maintenance can be performed more smoothly. The sub line 22 may be provided so as to be branched from an upstream portion of the main-line separable portion 25 in the main line 21 and to be joined downstream of the detachable portion by the main segment portion 25 have.

That is, the sub line 22 may be branched from the main line 21 adjacent to the reground portion 20 at one end of the hull 10 and joined to the main line 21 adjacent to the pump 40 have. The sub-line 22 may further include at least one sub-segment 29 detachably coupled with the main line 21.

When maintenance of one area of the main line 21 is required, a valve (not shown) provided on the main line 21 is provided to prevent the supply of seawater from the pump 40 to the main line 21 And the opening and closing member 30 provided at the other end side of the sub line 22 is opened to supply the seawater to the sub line 22. [ Alternatively, the open / close member 30 of the sub line 22 may be opened to supply the seawater to the sub line 22, and the seawater supplied to the main line 21 may be blocked.

At this time, the opening and closing member 30 provided on the sub line 22 may be provided as a general valve, but it may be provided as a spectacle flange in an embodiment of the present invention. The spectacle flange may be provided between the main segment 25 and the sub-segment 29 at the boundary between the main line 21 and the sub-line 22. [ Such a spectacle flange may serve to control the flow of seawater flowing into the subline 22, with one hole being perforated and the other being a perforated flange.

However, it is needless to say that the opening and closing member 30 of the present invention is not limited thereto, and may be provided in various ways that can easily open and close the sub-line 22 as needed.

As described above, according to the embodiment of the present invention, the main segment portion 25 located at the upper and lower portions of the maintenance portion of the main line 21 is separated from the main line 21, So that maintenance of the main line 21 can be performed.

At this time, the main line 21 may further include a bent portion 24 bent toward the regge portion 20 from above the hull 10. One end of the sub line 22 may be branched from the main line 21 located between the bent portion 24 and the reground portion 20. When maintenance is required at a portion of the main line 21 located below the bent portion 24, that is, inside the coffer dam 50, with respect to the bent portion 24, the sub line 22 So that the main line 21 can be maintained.

An opening 15 through which the main line 21 and the sub line 22 pass through can be provided on the upper portion of the hull 10. The opening 15 may be larger than the outer diameter of each of the main line 21 and the sub line 22, and a detailed description thereof will be given later with reference to FIGS. 4 and 5. FIG. A plurality of decks (not shown) may be provided in the cofferdam 50, and an opening (not shown) may be provided in a region through which the main line 21 and the sub line 22 pass.

FIG. 4 is a view showing a line positioned inside the copper dam in FIG. 2, and FIG. 5 is a sectional view showing A-A 'in FIG.

4 and 5, the main line 21 located in the interior of the coffer dam 50 may be provided with a main segment 25 so that one region can be separated, At least one lifting lug 26 may be provided to protrude upward.

This lifting lug 26 separates the main segment 25 located in one region of the main line 21 and maintains a part of the separated main line 21 at the time of maintenance of the main line 21 It is necessary to lift to the top. A hole is formed in the lifting lug 26 so that a rope or the like is inserted and fixed in the hole, and then a part of the separated main line 21 is lifted up.

At this time, the deck which is the upper part of the ship 10 may be provided with the opening 15 through which the main line 21 and the sub line 22 pass. The openings 15 may be larger than the outer diameters of the main lines 21 and the sub lines 22. This is for securing a space for lifting the main line 21 or the sub line 22 after separating a part of the main line 21 or the sub line 22 when maintenance is required.

In this way, according to an embodiment of the present invention, when the maintenance of the main line 21 to which the seawater is supplied from the pump 40 to the regeneration unit 20 is required, the seawater is supplied through the sub line 22 The regeneration unit 20 can be continuously operated, and the efficiency of the regeneration unit 20 can be improved.

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.

10: Hull 11, 12, 13, 14: Liquefied gas storage tank
15: opening 20:
21: main line 22: sub line
24: bent portion 25: main segment portion
26: lifting lug 29: sub-
30: opening and closing member 40: pump
50: Copper dam 100: Ship

Claims (13)

At least one liquefied gas storage tank for storing liquefied gas inside the hull;
A cofferdam disposed adjacent to the liquefied gas storage tank;
A regeneration unit installed on the hull to vaporize the liquefied gas;
A pump for pressurizing the seawater toward the regeneration unit;
A main line connecting the regeneration unit and the pump to flow the seawater and passing through the coffer dam; And
And a sub line branched from one area of the main line and adapted to be joined to another area,
Wherein the main line is connected to the main line,
Wherein the main line has at least one main segment which is detachably coupled to at least an area located inside the cofferdam. The apparatus according to claim 1,
Wherein the liquefied gas storage tank is provided between the side shell plates on both sides of the hull and the liquefied gas storage tank. The method of claim 1, wherein the sub-
Wherein one end is branched from an upstream portion of the main-line-separable portion in the main line, and the other end is joined downstream of the separable portion by the main-segment portion. The method of claim 3, wherein the sub-
Wherein one end is branched from the main line located at the top of the hull and the other end is joined to the main line adjacent to the pump. The apparatus of claim 4,
Further comprising a bent portion bent from the upper portion of the hull toward the reground portion. 6. The method of claim 5,
And one end of the sub line is branched from an area beyond the bent portion of the main line. 5. The method of claim 4,
And an opening / closing member for controlling opening / closing of the sub line is further provided at the other end of the sub line. 8. The apparatus according to claim 7, wherein the opening /
Characterized in that it comprises a spectacle flange. The apparatus of claim 1, wherein the sub-
Further comprising at least one subsegment that is detachably coupled to the liquefied gas regeneration system. 10. The method of claim 9,
In the main segment and the sub segment,
Wherein at least one lifting lug is further provided. ≪ Desc / Clms Page number 20 > 11. The method of claim 10,
Wherein the upper portion of the hull is provided with an opening through which the main line and the sub line are respectively passed. 12. The apparatus according to claim 11,
Wherein the outer diameter of each of the main line and the sub line is larger than the outer diameter of each of the main line and the sub line. A vessel having the liquefied gas regeneration system of any one of claims 1 to 12.

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