KR102177572B1 - Regasification System of liquefied Gas and ship having the same - Google Patents

Abstract

A liquefied gas regasification system and a ship including the same according to the present invention include: at least one liquefied gas storage tank for storing liquefied gas in a hull; A cofferdam installed adjacent to the liquefied gas storage tank; A regasification unit installed on the upper part of the hull to vaporize the liquefied gas; A pump to pressurize seawater toward the regasification unit; A main line through which the seawater flows by connecting the regasification unit and the pump, and passes through the cofferdam; And a sub-line branched from one region of the main line and provided to join another region, wherein the sub-line flows seawater during maintenance of the main line, and the main line includes at least the copper. It is characterized in that it has at least one main segment that is detachably coupled to a region located inside the dam.

Description

Regasification System of liquefied Gas and ship having the same}

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

As environmental regulations have recently been strengthened, the use of liquefied natural gas (Liquefied Natural Gas, hereinafter referred to as liquefied gas) close to environment-friendly fuels among various fuels is increasing. Liquefied gas is generally transported through a liquefied gas carrier, and is stored in a tank of a liquefied gas carrier in a liquid state by lowering the temperature to -163°C or less under 1 atmosphere. When LNG is in a liquid state, its volume is reduced to one 600th of its gaseous state, thus increasing the transport efficiency.

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

Such a regasification facility includes a regasification unit on a deck of the hull, the regasification unit and a storage tank in which the liquefied gas is stored are connected by a plurality of pipes, and a plurality of pipes are provided in a cofferdam.

However, since a plurality of pipes connecting the regasification unit and the storage tank are integrally provided, it is difficult not only to maintain the pipe, but also, there is a problem that the operation of the entire regasification facility must be stopped when maintenance is required. .

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to maintain and maintain by separating the main line connecting the pump for pressurizing seawater and the regasification unit at least inside the cofferdam. It is to provide a liquefied gas regasification system capable of easily separating the required part and a ship having the same.

In addition, an object of the present invention is to provide a liquefied gas regasification system capable of allowing seawater to flow through the sub-line when maintenance of the main line is required by providing a sub-line connected to the main line, and a ship having the same. For.

Liquefied gas regasification system according to an embodiment of the present invention, at least one liquefied gas storage tank for storing the liquefied gas in the interior of the ship; A cofferdam installed adjacent to the liquefied gas storage tank; A regasification unit installed on the upper part of the hull to vaporize the liquefied gas; A pump to pressurize seawater toward the regasification unit; A main line through which the seawater flows by connecting the regasification unit and the pump, and passes through the cofferdam; And a sub-line branched from one region of the main line and provided to join another region, wherein the sub-line flows seawater during maintenance of the main line, and the main line includes at least the copper. It is characterized in that it has at least one main segment that is detachably coupled to a region located inside the dam.

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

Specifically, the sub-line may be provided such that one end branches off from an upstream of a portion separable by the main segment in the main line, and the other end joins downstream of a portion separable by the main segment portion.

Specifically, the sub-line may have one end branched from the main line positioned above the hull, and the other end may join the main line adjacent to the pump.

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

Specifically, one end of the sub-line may branch from a region past the bent portion of the main line.

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

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

Specifically, at least one sub-segment part separably coupled to the sub-line may be further provided.

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

Specifically, an opening through each of the main line and the sub line may be provided in the upper portion of the hull and the cofferdam.

Specifically, the opening may be provided 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 includes the at least one liquefied gas regasification system.

In the liquefied gas regasification system according to the present invention and a ship having the same, the main line connecting the pump to pressurize seawater and the regasification unit is detachably coupled at least inside the cofferdam to facilitate maintenance of parts requiring maintenance. By separating, operation convenience can be improved and cost can be reduced.

In addition, the liquefied gas regasification system according to the present invention and a ship having the same, by providing a sub-line connected to the main line, can allow seawater to flow through the sub-line when maintenance of the main line is required, Since the regasification unit can be continuously operated without stopping, the efficiency of the regasification unit can be improved.

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

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In adding reference numerals to elements of each drawing in the present specification, it should be noted that, even though they are indicated on different drawings, only the same elements are to have the same number as possible. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, it is noted that the ship described below is a concept encompassing an offshore structure that performs a specific task by floating at a certain point on the sea in addition to a commercial ship that transports cargo from the origin to the destination.

Hereinafter, exemplary 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, the ship 100 according to an embodiment of the present invention, at least one liquefied gas storage tanks (11, 12, 13, 14), and liquefied gas storage tanks (11, 12, 13, 14). ), by connecting the cofferdam 50 installed adjacent to the pump 40 to pressurize seawater, the regasification unit 20 to vaporize the liquefied gas, and the regasification unit 20 and the pump 40 It flows and includes a main line 21 and a sub line 22 passing through the cofferdam 50.

The ship or offshore structure according to an embodiment of the present invention may be a ship, a special ship, and an offshore structure provided with a regasification unit 20 for regasifying liquefied gas.

Such a ship or offshore structure may be, for example, a floating storage and regasification unit (FSRU) and a regasification vessel (RV). LNG RV is the installation of LNG regasification facilities on liquefied gas carriers capable of self-navigation and floating, and LNG FSRU stores liquefied gas unloaded from LNG carriers at sea far from land and then stores them in a liquefied gas storage tank as needed. It is an offshore structure that vaporizes liquefied gas and supplies it to land demanders.

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

And, the cofferdam 50 between the plurality of liquefied gas storage tanks 11, 12, 13, 14, and between the side shell plates on both sides of the hull 10 and the liquefied gas storage tanks 11, 12, 13, 14 ) Can be installed. Although not shown in the drawings, the cofferdam 50 may include a longitudinal cofferdam and a transverse cofferdam, and a plurality of liquefied gas storage tanks 11, 12, 13 by a longitudinal cofferdam and a transverse cofferdam , 14) may have a lattice structure that separates and accommodates.

Since the liquefied gas is stored in the liquefied gas storage tanks 11, 12, 13, 14 at a temperature of about -163°C, it must have a structure capable of withstanding brittle fracture in a cryogenic environment. Accordingly, the liquefied gas storage tanks 11, 12, 13, 14 are surrounded by the cofferdam 50 to separate each liquefied gas storage tanks 11, 12, 13, 14, and at the same time, each liquefied gas storage tank 11 , 12, 13, 14) can be prevented from being brittle by liquefied gas by maintaining it above a certain temperature.

At this time, each liquefied gas storage tank (11, 12, 13, 14) is provided with a liquefied gas pump 70, the liquefied gas can be supplied to the regasification unit 20 along the liquefied gas supply line (60). . In addition, the pump 40 pressurizes seawater introduced from the sea chest (not shown) to flow to the regasification unit 20 to heat the liquefied gas.

The regasification unit 20 may be installed on the upper part of the hull 10 and may vaporize the liquefied gas supplied from the liquefied gas pump 70. As described above, the seawater in the regasification unit 20 provides heat of vaporization to the liquefied gas by heat-exchanging with the liquefied gas to vaporize the liquefied gas. The vaporized liquefied gas may be supplied to a consumer, and the consumer may be an engine or turbine that produces energy, or a final consumer such as city gas or general households.

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. Seawater can be a sufficient heat source to vaporize liquefied gas, and since it is easy to withdraw from ships or offshore structures provided on the sea, seawater can be used as a heat source when liquefied gas is regasified.

In addition, the regasification unit 20 may heat the liquefied gas using various heat sources in addition to seawater, and may heat the liquefied gas using glycol water without a risk of corrosion such as a heat exchanger or pipe.

In this case, the regasification unit 20 and the pump 40 may be connected by a main line 21 through which seawater flows, and the main line 21 may be disposed to pass through the cofferdam 50. In addition, the main line 21 may be provided with a main supply line 21a through which seawater is supplied and a main discharge line 21b through which seawater is discharged. The main line 21 according to an embodiment of the present invention may be provided with at least one main segment 25 (refer to FIG. 2 ), and the main segment 25 is located inside the cofferdam 50. It may be provided in one area of the main line 21. In addition, 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 regasification unit 20 can be continuously operated without stopping.

The sub-line 22 may be provided so as to diverge from the upstream of the part separable by the main segment 25 in the main line 21 and join the downstream of the separable part by the main segment 25. . In this case, 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.

Thereby, the main supply line (21a) or the main discharge line (21b) can be maintained by separating only a part that needs maintenance. At this time, seawater is moved through the sub supply line (22a) or the sub discharge line (22b). , As the regasification unit 20 can be continuously operated, the efficiency of the regasification unit 20 may be improved.

In addition, a drain part (not shown) may be provided in the cofferdam 50. The drain portion may be provided on the lower side of the cofferdam 50 through which the main line 21 and the sub line 22 pass, and it can be seen that seawater leaks. In this case, a sensor (not shown) may be additionally attached to the drain part, and when seawater leaks, the sensor detects it and generates a leak signal through an alarm or the like. Accordingly, when water leakage generated in the main line 21 is confirmed, seawater flowing to the main line 21 is blocked, and the seawater flows to the sub-line 22 so that the regasification unit 20 can be continuously operated. have.

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

Referring to FIG. 1 along with FIGS. 2 and 3, the main line 21 constituting the liquefied gas regasification system according to an embodiment of the present invention is a cofferdam to connect the pump 40 and the regasification unit 20. It may be provided through the inside of (50). At this time, the pump 40 may be provided outside the liquefied gas storage tanks 11, 12, 13, 14, and the regasification unit 20 may be provided on a deck that is an upper portion of the hull 10.

Since the main line 21 is used as a passage through which seawater can be supplied from the pump 40 to the regasification unit 20, or seawater can be discharged after heat exchange, in general, replacement or maintenance of the main line 21 is required. In this case, maintenance work was performed after stopping the operation of the regasification unit 20. However, in the present invention, when the main line 21 is maintained by having the sub-line 22 connected to the main line 21, the regasification unit 20 is formed by allowing seawater to flow to the sub-line 22. Costs can be reduced by continuing to operate.

In this case, the main line 21 may be detachably coupled by a plurality of main segment parts 25. Here, the main segment 25 is provided at least on the main line 21 located inside the cofferdam 50, so that when the main line 21 located in the cofferdam 50 is replaced, the corresponding part is separated. It can be maintained more smoothly. In addition, the sub-line 22 may be provided so as to branch from the upstream of the part separable by the main segment 25 in the main line 21 and join the downstream of the separable part by the main segment 25. have.

That is, the sub-line 22 has one end branched from the main line 21 adjacent to the regasification unit 20 at the top of the hull 10, and the other end can be joined to the main line 21 adjacent to the pump 40. have. And, like the main line 21, the sub-line 22 may further include at least one sub-segment 29 that is detachably coupled.

Accordingly, when maintenance of one area of the main line 21 is required, a valve (not shown) provided in the main line 21 is first provided to block the supply of seawater from the pump 40 to the main line 21. The seawater may be supplied to the sub-line 22 by closing and opening the opening/closing member 30 provided at the other end of the sub-line 22. Alternatively, conversely, after opening the opening and closing member 30 of the sub-line 22 to supply seawater to the sub-line 22, seawater supplied to the main line 21 may be blocked.

At this time, the opening/closing member 30 provided in the sub-line 22 may be provided as a general valve, but 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 is a flange having a hole in one side and a hole in the other side, and may serve to control the flow of seawater flowing to the sub-line 22.

However, the opening/closing member 30 of the present invention is not limited thereto, and of course, the sub-line 22 may be provided in various ways that can be easily opened and closed as needed.

As described above, according to an embodiment of the present invention, the main segment 25 positioned above and below the portion requiring maintenance of the main line 21 is separated from the main line 21, and the sub-line 22 ), it is possible to perform maintenance of the main line 21 by allowing seawater to flow.

In this case, the main line 21 may further include a bent portion 24 that is bent toward the regasification portion 20 from the upper portion of the hull 10. In addition, one end of the sub-line 22 may be branched from the main line 21 positioned between the bent portion 24 and the regasification portion 20. Accordingly, when maintenance is required at any one portion of the main line 21 located in the lower portion of the bent portion 24, that is, the inside of the cofferdam 50, based on the bent portion 24, the sub-line 22 After allowing the seawater to flow, the main line 21 can be maintained.

In addition, an opening 15 through which the main line 21 and the sub line 22 pass through may be provided at the upper portion of the hull 10. The opening 15 may be provided larger than the outer diameter of each of the main line 21 and the sub line 22, and a detailed description thereof will be described later with reference to FIGS. 4 and 5. In addition, a plurality of decks (not shown) may be provided inside 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 diagram illustrating a line located inside a cofferdam in FIG. 2, and FIG. 5 is a cross-sectional view illustrating A-A' of FIG.

Referring to FIGS. 4 and 5, the main line 21 located inside the cofferdam 50 may be provided with a main segment 25 so that one area can be separated, and the main segment 25 has At least one lifting lug 26 may be provided to protrude upward.

When the main line 21 is maintained, the lifting lug 26 separates the main segment 25 located in one area of the main line 21, and then removes a part of the separated main line 21. It is necessary to lift it to the top. A hole is formed in the lifting lug 26, and after fixing by inserting a rope or the like into the hole, a part of the separated main line 21 can be lifted upward.

In this case, an opening 15 through which the main line 21 and the sub line 22 pass may be provided in the deck that is an upper portion of the hull 10. These openings 15 may be provided larger than the outer diameters of each of the main line 21 and the sub-line 22. This is to secure a space for lifting after separating a part of the main line 21 or the sub line 22 when maintenance of the main line 21 or the sub line 22 is required.

As described above, according to an embodiment of the present invention, when maintenance of the main line 21 to which seawater is supplied from the pump 40 to the regasification unit 20 is required, the seawater is supplied through the sub-line 22. By doing so, the efficiency of the regasification unit 20 may be improved by continuously operating the regasification unit 20.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, and the present invention is not limited thereto, and within the technical scope of the present invention, those of ordinary skill in the art It would be clear that the transformation or improvement is possible.

All simple modifications to changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

10: hull 11, 12, 13, 14: liquefied gas storage tank
15: opening 20: regasification unit
21: main line 22: sub line
24: bent portion 25: main segment
26: lifting lug 29: sub segment
30: opening and closing member 40: pump
50: cofferdam 100: ship

Claims (13)

At least one liquefied gas storage tank for storing liquefied gas inside the hull;
A Cofferdam installed adjacent to the liquefied gas storage tank;
A regasification unit installed on the upper part of the hull to vaporize the liquefied gas;
A pump to pressurize seawater toward the regasification unit;
A main line through which the seawater flows by connecting the regasification unit and the pump, and passes through the cofferdam; And
A sub-line branched from one region of the main line and provided to join another region; and
In the sub-line, seawater flows during maintenance of the main line,
The main line, at least one liquefied gas regasification system comprising at least one main segment separably coupled to a region located inside the cofferdam. The method of claim 1, wherein the cofferdam,
Liquefied gas regasification system, characterized in that provided between the side shells on both sides of the hull and the liquefied gas storage tank. The method of claim 1, wherein the sub-line,
A liquefied gas regasification system, characterized in that one end is branched from an upstream of a portion separable by the main segment in the main line, and the other end is provided to join a downstream portion of the separable portion by the main segment. The method of claim 3, wherein the sub-line,
Liquefied gas regasification system, characterized in that one end branches off from the main line located above the hull, and the other end joins the main line adjacent to the pump. The method of claim 4, wherein the main line,
Liquefied gas regasification system, characterized in that it further comprises a bent portion bent toward the regasification portion at the top of the hull. The method of claim 5,
The liquefied gas regasification system, characterized in that one end of the sub-line diverges from a region past the bent portion of the main line. The method of claim 4,
Liquefied gas regasification system, characterized in that further provided at the other end of the sub line, an opening and closing member for controlling the opening and closing of the sub line. The method of claim 7, wherein the opening and closing member,
Liquefied gas regasification system, characterized in that it comprises a spectacle flange (Spectacle flange). The method of claim 1, wherein in the sub-line,
Liquefied gas regasification system, characterized in that further provided with at least one sub-segment that is detachably coupled. The method of claim 9,
In the main segment and the sub segment,
Liquefied gas regasification system, characterized in that at least one lifting lug (Lifting lug) is further provided, respectively. The method of claim 10,
Liquefied gas regasification system, characterized in that an opening through which the main line and the sub-line pass through, respectively, at an upper portion of the hull. The method of claim 11, wherein the opening,
Liquefied gas regasification system, characterized in that provided larger than the outer diameter of each of the main line and the sub-line. A ship comprising the liquefied gas regasification system according to any one of claims 1 to 12.

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