Liquefied gas storage tank and ship including the same

Abstract

A liquefied gas storage tank according to one embodiment of the present invention may include a tank body member in which liquefied gas is stored, and an inner frame unit provided inside the tank body member, replacing a water-removing partition wall, and guiding the flow of the liquefied gas.

Description

Technical Field

[0001] The present invention relates to a liquefied gas storage tank and a ship including the same.

Background Art

[0002] Generally, petroleum resources used as transportation fuels such as automobiles and ships, and various fuels used at home and abroad are gradually depleting, and the use of liquefied gas as an alternative energy is increasing in response to rising oil prices and stricter environmental regulations.

[0003] As an example, liquefied gas includes liquefied natural gas (LNG) or liquefied propane gas (LPG). Such liquefied gas is convenient for storage and transportation in a liquefied state because its volume is greatly reduced compared to the gaseous state (for example, in the case of LNG, the volume at the time of liquefaction is reduced to 1 / 600, and in the case of LPG, it may be greatly reduced to 1 / 250 at the time of liquefaction), but there is a difficulty that the temperature must be maintained below the boiling point (about -162°C for LNG and about -50°C for LPG).

[0004] In order to store such liquefied gas, an ultra-low temperature liquefied gas storage tank that maintains the liquefied gas below the boiling point is required.

[0005] By the way, the liquefied gas storage tank is a structure for storing liquefied fuel of a transportation vehicle such as a ship. Since a liquid is stored inside, inevitably, the liquefied gas storage tank cannot always maintain a horizontal level with respect to the water surface or the ground due to the movement of a floating structure such as a ship or a land transportation vehicle, and thereby the flow of the liquid fuel occurs.

[0006] Due to the occurrence of such a flow of liquefied gas, a collision occurs between the inner wall portion of the liquefied gas storage tank and the flowing liquefied gas, and there is a problem that such continuous collision causes damage to the liquefied gas storage tank.

[0007] Therefore, conventionally, a swash bulk head wall was provided inside the liquefied gas storage tank to prevent damage to the liquefied gas storage tank caused by the sloshing of the liquefied gas.

[0008] However, such a swash bulk head wall is provided in the form of a partition wall in the middle of the liquefied gas storage tank. As a high-weight member, it is difficult to install inside the liquefied gas storage tank, and there is a problem that the manufacturing cost increases.

[0009] Therefore, in order to solve or improve the above problems, research on liquefied gas storage tanks and ships including the same is required.

Summary of the Invention

Problems to be Solved by the Invention

[0010] An object of the present invention is to provide a liquefied gas storage tank and a ship including the same that prevent the problem of collision between the inner wall of the liquefied gas storage tank and the flowing liquefied gas due to the generation of the flow of the liquefied gas.

[0011] In another aspect, the present invention aims to provide a liquefied gas storage tank and a ship including the same that can support the liquefied gas storage tank by preventing the problem of collision between the inner wall of the liquefied gas storage tank and the flowing liquefied gas without using a conventional swash bulk head wall.

Means for Solving the Problems

[0012] A liquefied gas storage tank according to an embodiment of the present invention may include a tank body member in which liquefied gas is stored and an inner frame unit provided inside the tank body member to replace a swash bulk head wall and guide the flow of the liquefied gas.

[0013] Specifically, the inner frame unit of the liquefied gas storage tank according to an embodiment of the present invention includes a ring support member continuously provided in the inner circumferential direction of the tank main body member, and a split guide member that is coupled to the ring support member and is provided in a form including a curved surface, and guides the liquefied gas to flow back in the flowing-in direction along the curved surface portion.

[0014] Here, one end of the split guide member of the liquefied gas storage tank according to an embodiment of the present invention can be coupled to the ring support member, and the other end can be provided in a form bent toward the short side wall portion of the tank main body member.

[0015] And a plurality of the split guide members of the liquefied gas storage tank according to an embodiment of the present invention are provided along the inner circumferential direction of the tank main body member, and the direction of forming the curved surface can be formed opposite to the direction of forming the curved surface of another adjacent split guide member.

[0016] Alternatively, a plurality of the split guide members of the liquefied gas storage tank according to an embodiment of the present invention are provided along the inner circumferential direction of the tank main body member, and the direction of forming the curved surface can be formed in the same direction as the direction of forming the curved surface of another adjacent split guide member.

[0017] Here, the cross section of the ring support member of the liquefied gas storage tank according to an embodiment of the present invention can be formed in a "T" shape.

[0018] Further, an inflow pipe portion for connecting the inside and the outside of the tank main body member of the liquefied gas storage tank according to an embodiment of the present invention is provided, and further includes a pump unit that sucks the liquefied gas stored inside the tank main body member through the inflow pipe portion and transmits it to the outside. The inner frame unit is disposed at the bottom of the tank main body member, and can include a residual water storage member in which a recess for storing the liquefied gas is formed so that the end of the inflow pipe portion is immersed in the liquefied gas, and an upper end guide member coupled to the upper end of the residual water storage member.

[0019] Here, the upper end guiding member of the liquefied gas storage tank according to an embodiment of the present invention is provided in a form including a curved surface, and the liquefied gas can be guided to flow back in the flowing inflow direction along the curved surface portion.

[0020] And, a residual water accommodating member of the liquefied gas storage tank according to an embodiment of the present invention can have a residual water flow hole through which the liquefied gas moves formed at an upper end portion.

[0021] Also, the inner frame unit of the liquefied gas storage tank according to an embodiment of the present invention is provided at least at a bottom portion of the tank main body member, and includes a bottom support member having a "T" - shaped cross - section and an inclined guiding member that is coupled to a horizontal portion at an upper end of the bottom support member, one end of which is coupled to one side end of the horizontal portion of the bottom support member and the other end of which is coupled to the bottom portion of the tank main body member, and guides the liquefied gas to move along the bottom support member.

[0022] A ship according to another embodiment of the present invention can include a hull including the liquefied gas storage tank and an engine unit that provides driving force and is provided with the liquefied gas storage tank.

Advantages of the Invention

[0023] The liquefied gas storage tank of the present invention and a ship including the same have an advantage of being able to prevent a problem in which a collision occurs between an inner wall portion of the liquefied gas storage tank and the flowing liquefied gas due to the generation of the flow of the liquefied gas.

[0024] On the other hand, the liquefied gas storage tank of the present invention and a ship including the same can prevent a problem in which a collision occurs between an inner wall portion of the liquefied gas storage tank and the flowing liquefied gas due to the generation of the flow of the liquefied gas without using a conventional water removal partition wall, and have an advantage of being able to support the liquefied gas storage tank.

[0025] Thereby, it is possible to facilitate the manufacture of the liquefied gas storage tank, prevent damage to the liquefied gas storage tank while reducing manufacturing costs.

[0026] However, the diverse yet meaningful advantages and effects of the present invention are not limited to the above-described content, and can be more easily understood during the process of explaining the specific embodiments of the present invention.

Brief Description of the Drawings

[0027]

Figure 1

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Figure 3

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Figure 7

Modes for Carrying Out the Invention

[0028] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into several other forms, and the scope of the present invention is not limited to the embodiments described below. Also, the embodiments of the present invention are provided to more fully explain the present invention to those with average knowledge in the relevant technical field. Therefore, the shape, size, etc. of the elements in the drawings may be enlarged, reduced (or emphasized or simplified) for clearer explanation.

[0029] In addition, in this specification, a singular expression includes a plural expression unless the context clearly indicates a different meaning, and reference numerals assigned in the same reference numeral or a similar manner throughout the specification indicate the same component or corresponding components.

[0030] The present invention relates to a liquefied gas storage tank 1 and a ship including the same, and an inner frame unit 20 that replaces a swash bulk head wall is provided inside the tank body member 10. By guiding the flow of the liquefied gas with such an inner frame unit 20, it is possible to prevent the problem of collision between the inner wall portion of the liquefied gas storage tank 1 and the flowing liquefied gas caused by the generation of the flow of the liquefied gas.

[0031] On the other hand, the liquefied gas storage tank 1 of the present invention and the ship including the same can prevent the problem of collision between the inner wall portion of the liquefied gas storage tank 1 and the flowing liquefied gas caused by the generation of the flow of the liquefied gas without using a conventional swash bulkhead by providing the inner frame unit 20, and can support the liquefied gas storage tank 1.

[0032] Thereby, it is possible to facilitate the manufacture of the liquefied gas storage tank 1, prevent damage to the liquefied gas storage tank 1 while reducing the manufacturing cost.

[0033] Specifically, the liquefied gas storage tank 1 of the present invention can include a tank body member 10 and an inner frame unit 20.

[0034] FIG. 1 and FIG. 3 are side views showing an embodiment including a ring support member 21 and a split guide member 22 in the liquefied gas storage tank 1 of the present invention. FIG. 1 shows an embodiment in which the direction of forming the curved surface of the split guide member 22 is formed opposite to the direction of forming the curved surface of another adjacent split guide member 22, and FIG. 3 shows an embodiment formed in the same direction.

[0035] And, FIGS. 2 and 4 are perspective views showing the ring support member and the split guide member of FIG. 1 or FIG. 3, respectively.

[0036] The tank body member 10 of the liquefied gas storage tank 1 according to an embodiment of the present invention can store liquefied gas.

[0037] And, the inner frame unit 20 of the liquefied gas storage tank 1 according to an embodiment of the present invention is provided inside the tank body member 10, replaces the water removal partition wall, and can guide the flow of the liquefied gas.

[0038] That is, the inner frame unit 20 is provided inside the tank body member 10 in place of the conventional water removal partition wall and serves to guide the flow of the liquefied gas.

[0039] Thereby, the problem that the liquefied gas impacts one side inside the tank body member 10 can be improved, and since there is no heavy water removal partition wall, the manufacturing of the liquefied gas storage tank 1 can be facilitated and the manufacturing cost can be reduced.

[0040] Specifically, the inner frame unit 20 can include, as an embodiment, a ring support member 21 and a split guide member 22.

[0041] Here, the ring support member 21 can be continuously provided in the inner circumferential direction of the tank body member 10. And, the split guide member 22 is coupled to the ring support member 21 and is provided in a form including a curved surface, and can guide the liquefied gas to return in the flow inflow direction D along the curved surface portion.

[0042] That is, the ring support member 21 serves to support the tank body member 10, thereby removing the conventional water removal partition wall, and enabling the tank body member 10 to be supported even when it is replaced by the inner frame unit 20 of the present invention. Such a support function of the ring support member 21 can be more firmly supported by the ring support member 21 being provided in a ring shape continuous in the inner circumferential direction of the tank body member 10.

[0043] Such a ring support member 21 can further increase the supporting force by limiting the cross-sectional form. That is, the ring support member 21 of the liquefied gas storage tank 1 according to an embodiment of the present invention can be formed with a "T"-shaped cross section.

[0044] The split guiding member 22 of the present invention serves to improve the problem that the liquefied gas suddenly moves from one side to the other side of the tank body member 10 and impacts the tank body member 10. For this purpose, the split guiding member 22 is formed in a form including a curved surface, whereby the liquefied gas is guided to flow along the curved surface portion of the split guiding member 22. Also, thereby, the liquefied gas is guided to be returned in the flowing inflow direction D transmitted to the split guiding member 22.

[0045] Therefore, the problem that the liquefied gas suddenly deviates from one side to the other side of the tank body member 10 can be improved, and the problem that the liquefied gas impacts the tank body member 10 can be improved.

[0046] Specifically, one end of the split guiding member 22 of the liquefied gas storage tank 1 according to an embodiment of the present invention can be coupled to the ring support member 21, and the other end can be provided in a form bent toward the short side wall portion 10b of the tank body member 10. Here, the short side wall portion 10b means the side wall portion of the tank body member 10 having a relatively short length in the top view of the tank body member 10. Also, the long side wall portion 10c means the side wall portion of the tank body member 10 having a relatively long length in the top view of the tank body member 10.

[0047] That is, the division guiding member 22 can be formed in a shape bent toward either one of the short side wall portions 10b on both sides of the tank main body member 10. Thereby, when a flow occurs in which the liquefied gas stored in one short side wall portion 10b suddenly moves in the direction of the other short side wall portion 10b, the liquefied gas flows along the curved surface of the division guiding member 22 and returns to the original position, that is, the direction of the short side wall portion 10b on one side. Thereby, the problem that the liquefied gas impacts the other short side wall portion 10b can be prevented.

[0048] Also, as an example, such a division guiding member 22 can be formed in a curved surface shape bent in a direction opposite to that of another adjacent division guiding member 22.

[0049] That is, a plurality of division guiding members 22 according to an embodiment of the present invention are provided along the inner circumferential direction of the tank main body member 10, and the direction of forming the curved surface can be formed opposite to the direction of forming the curved surface of another adjacent division guiding member 22.

[0050] According to this, the impact problem caused by the liquefied gas suddenly transmitted from either direction on both sides by the division guiding member 22 can be prevented.

[0051] As an example, some of the division guiding members 22 can form a curved surface toward the short side wall portion 10b on one side, and the remaining adjacent division guiding members 22 can form a curved surface toward the short side wall portion 10b on the other side. According to this, some of the division guiding members 22 guide a part of the liquefied gas suddenly transmitted from the short side wall portion 10b on one side to return to the short side wall portion 10b on one side again, and the remaining adjacent division guiding members 22 can guide a part of the liquefied gas suddenly transmitted from the short side wall portion 10b on the other side to return to the short side wall portion 10b on the other side again.

[0052] Or as an example, the plurality of division guiding members 22 can be formed in a curved surface shape bent in the same direction.

[0053] That is, a plurality of split guiding members 22 of the liquefied gas storage tank 1 according to an embodiment of the present invention are provided along the inner circumferential direction of the tank main body member 10, and the direction of forming the curved surface can be the same as the direction of forming the curved surface of another adjacent split guiding member 22.

[0054] According to this, it is possible to prevent the impact problem caused by the liquefied gas suddenly transmitted from one side direction by the split guiding member 22.

[0055] As an example, when a plurality of split guiding members 22 form a curved surface toward the short side wall portion 10b on one side, it is possible to guide the liquefied gas suddenly transmitted from the short side wall portion 10b on one side back to the short side wall portion 10b on one side again.

[0056] Such an embodiment of the split guiding member 22 can guide more liquefied gas flowing back from the short side wall portion 10b on one side compared to the embodiment of the split guiding member 22 formed to bend in the opposite direction to another adjacent split guiding member 22 described above.

[0057] FIG. 5 is a front view showing an embodiment including a residual water storage member 23 and an upper end guiding member 24 in the liquefied gas storage tank 1 of the present invention. Referring to FIG. 5, the liquefied gas storage tank 1 of the present invention can further include a pump unit 30. Further, the inner frame unit 20 of the present invention can include a residual water storage member 23 and an upper end guiding member 24.

[0058] Here, the pump unit 30 of the liquefied gas storage tank 1 according to an embodiment of the present invention can be provided with an inflow pipe portion 31 that connects the inside and the outside of the tank main body member 10. And the pump unit 30 can suck the liquefied gas stored inside the tank main body member 10 through the inflow pipe portion 31 and transmit it to the outside.

[0059] The residual water storage member 23 of the present invention is disposed at the bottom 10a of the tank main body member 10, and a recess 23a for storing liquefied gas can be formed so that the end of the inflow pipe portion 31 is immersed in the liquefied gas.

[0060] And the upper end guiding member 24 of the present invention can be coupled to the upper end portion of the residual water storage member 23. Further, the upper end guiding member 24 of the present invention is provided in a form including a curved surface, and can guide the liquefied gas to flow back in the flow inflow direction D along the curved surface portion.

[0061] A part of the liquefied gas stored in the tank main body member 10 is transmitted to the outside through the inflow pipe portion 31 of the pump unit 30, and the remaining liquefied gas remains at the bottom 10a of the tank main body member 10. Further, as the residual liquefied gas converges in the recess 23a of the residual water storage member 23 which is located lower than the bottom 10a of the tank main body member 10, the end of the inflow pipe portion 31 is immersed in the liquefied gas even if there is less residual liquefied gas.

[0062] And in order for the above liquefied gas to converge in the recess 23a of the residual water storage member 23, a residual water flow hole 23b can be formed in the residual water storage member 23.

[0063] That is, a residual water flow hole 23b through which the liquefied gas moves can be formed at the upper end portion of the residual water storage member 23 of the liquefied gas storage tank 1 according to an embodiment of the present invention.

[0064] Thereby, the liquefied gas located adjacent to the bottom 10a of the tank main body member 10 can move to the recess 23a of the residual water storage member 23 through the residual water flow hole 23b.

[0065] The upper end guiding member 24 of the present invention serves to return the liquefied gas that suddenly flows due to the inclination of a transportation means such as a ship to its original position.

[0066] Specifically, the upper end guiding member 24 of the present invention can include a curved surface portion in a bent form. When liquefied gas suddenly flows and is transmitted to the curved surface portion of the upper end guiding member 24, the liquefied gas will move along the curved surface portion of the upper end guiding member 24.

[0067] Therefore, the flow of the liquefied gas is induced in the direction towards which the curved surface portion of the upper end guiding member 24 faces. As an example, the curved surface portion of the upper end guiding member 24 can be formed in a bent form towards either one of the short side wall portions 10b on both sides. Thus, when a flow occurs in which the liquefied gas stored in one short side wall portion 10b suddenly moves towards the other short side wall portion 10b, the liquefied gas flows along the curved surface of the upper end guiding member 24 and is returned to the direction of the short side wall portion 10b on one side, which is its original position. Thereby, the problem that the liquefied gas impacts the other short side wall portion 10b can be prevented.

[0068] FIG. 6 is a front view showing an embodiment including a bottom support member 26 and an inclination guiding member 25 in the liquefied gas storage tank 1 of the present invention. Referring to FIG. 6, the inner frame unit 20 of the liquefied gas storage tank 1 of the present invention can include a bottom support member 26 and an inclination guiding member 25.

[0069] Here, the bottom support member 26 is provided at least at the bottom 10a of the tank main body member 10, and its cross-section can be formed in a "T" shape. The inclination guiding member 25 is coupled to the horizontal portion at the upper end of the bottom support member 26. One end is coupled to one end of the horizontal portion of the bottom support member 26, and the other end is coupled to the bottom 10a of the tank main body member 10, so that the liquefied gas can be guided to move along the bottom support member 26.

[0070] That is, the bottom support member 26 serves to support the tank main body member 10. As a result, the conventional water removal partition wall is removed, and the tank main body member 10 can be supported even when it is replaced by the inner frame unit 20 of the present invention. Such a bottom support member 26 can be provided only at the bottom 10a of the tank main body member 10, or can be provided in a ring form continuous in the inner circumferential direction of the tank main body member 10.

[0071] Such a bottom support member 26 can further enhance the supporting force by limiting the cross-sectional shape to a "T" shape.

[0072] And when the liquefied gas on one side of the tank main body member 10 suddenly flows in the direction of the other side of the tank main body member 10, the inclination guiding member 25 can prevent the problem that after the liquefied gas is blocked by the bottom support member 26 in the flow path and aggregated around the bottom support member 26, it overcomes the bottom support member 26 at an increased flow rate after aggregation and suddenly moves to the other side of the tank main body member 10, further applying a greater impact to the other side of the tank main body member 10.

[0073] That is, even if a small amount of liquefied gas remains inside the tank main body member 10, the liquefied gas is at least located at the bottom 10a of the tank main body member 10. At this time, the liquefied gas located at the bottom 10a can be aggregated by the bottom support member 26 during sudden flow, and the inclination guiding member 25 can improve the problem of applying an amplified impact to the tank main body member 10 due to such aggregation of the liquefied gas.

[0074] In other words, the inclination guiding member 25 connects the horizontal portion at the upper end of the bottom support member 26 and the bottom 10a of the tank main body member 10 in an inclined form so that the flowing liquefied gas does not aggregate at the "T" portion of the bottom support member 26. As a result, the liquefied gas can move from one side to the other side of the tank main body member 10 along the inclination guiding member 25, thus preventing the problem of aggregation around the bottom support member 26.

[0075] On the one hand, such an inclination guiding member 25 is only located around the bottom 10a of the tank main body member 10, and is not located around the side walls such as the long side wall portion 10c of the tank main body member 10. This is because when liquefied gas is stored up to the periphery of the long side wall portion 10c, there is no need to consider the aggregation of liquefied gas, and the flow rate of liquefied gas is relatively large. That is, when liquefied gas is stored up to the periphery of the long side wall portion 10c of the tank main body member 10, it is only necessary to prevent the flow of liquefied gas so as to prevent the impact caused by the sudden flow of liquefied gas, and the matter of aggregation is not considered.

[0076] FIG. 7 is a side view showing the liquefied gas storage tank 1 of the present invention and a ship including the same. Referring to FIG. 7, the ship of the present invention can include a liquefied gas storage tank 1 and a hull 2.

[0077] Here, the liquefied gas storage tank 1 is substituted for the description of the liquefied gas storage tank 1 described above.

[0078] And the hull 2 can include an engine portion 2a provided with the liquefied gas storage tank 1 and providing driving force.

[0079] That is, by including the liquefied gas storage tank 1 of the present invention in the ship, the problem of collision between the inner wall portion of the liquefied gas storage tank 1 and the flowing liquefied gas caused by the sudden generation of the flow of liquefied gas can be prevented without using a conventional water removal partition wall.

[0080] In this way, the ship of the present invention can facilitate the manufacture of the liquefied gas storage tank 1 without using a conventional water removal partition wall, and can prevent damage to the liquefied gas storage tank 1 while reducing the manufacturing cost.

[0081] In addition, since the liquefied gas storage tank 1 can be lightened, the operation efficiency of the ship can be improved.

[0082] Although the embodiments of the present invention have been described in detail above, the scope of the rights of the present invention is not limited thereto, and it is obvious to those skilled in the art that various modifications and variations are possible within the scope not departing from the technical idea of the present invention described in the claims.

Explanation of Reference Numerals

[0083] 1 Liquefied gas storage tank 2 Hull 10 Tank body member 20 Inner frame unit 21 Ring support member 22 Split guide member 23 Residual water storage member 24 Upper end guide member 25 Inclination guide member 26 Bottom support member 30 Pump unit 31 Inflow pipe section

Claims

1. A tank body member in which a liquefied gas is stored; and An inner frame unit provided inside the tank body member, replacing a water removal partition, and guiding the flow of the liquefied gas; including The inner frame unit includes A ring support member continuously provided in the inner circumferential direction of the tank body member; and A divided guide member coupled to the ring support member, provided in a form including a curved surface, and guiding the liquefied gas so that the liquefied gas flows back in the flow-in direction along the curved surface; including The curved surface extends from the joint of the divided guide member and the ring support member toward the radially inner side of the tank body member and then extends in the axial direction of the tank body member. The divided guide members are provided in a plurality along the inner circumferential direction of the tank body member, and the direction of forming the curved surface is formed in the same direction as that of the curved surface of another adjacent divided guide member. A liquefied gas storage tank.

2. One end of the divided guide member is coupled to the ring support member, and the other end is bent toward the short side wall portion of the tank body member to form the curved surface. The liquefied gas storage tank according to claim 1.

3. The ring support member has a cross section along the axial direction formed in a "T" shape. The liquefied gas storage tank according to claim 1.

4. An inflow pipe portion connecting the inside and outside of the tank body member is provided, and a pump unit that sucks the liquefied gas stored inside the tank body member through the inflow pipe portion and transmits it to the outside; further including The inner frame unit includes A residual water storage member disposed at the bottom of the tank body member, in which a recess for storing the liquefied gas is formed so that the end of the inflow pipe portion is immersed in the liquefied gas; and An upper end guide member coupled to the upper end portion of the residual water storage member; further including the liquefied gas storage tank according to claim 1.

5. The upper end guiding member is provided in a form including a curved surface, and guides the liquefied gas so that the liquefied gas flows along the curved surface and is returned in the flowing-in direction, The curved surface extends radially inward of the tank body member from the joint between the upper end of the residual water storage member and the upper end guiding member and then extends in the axial direction of the tank body member. The liquefied gas storage tank according to claim 4.

6. A residual water flow hole through which the liquefied gas moves is formed at the upper end of the residual water storage member. The liquefied gas storage tank according to claim 4.

7. The inner frame unit At least provided at the bottom of the tank body member, a bottom support member having a "T" - shaped cross - section along the axial direction; and An inclined guiding member coupled to the horizontal portion at the upper end of the bottom support member, one end being coupled to one side end of the horizontal portion of the bottom support member and the other end being coupled to the bottom of the tank body member, and guiding the liquefied gas to move along the bottom support member. The liquefied gas storage tank according to claim 1.

8. The liquefied gas storage tank according to any one of claims 1 to 7; and A ship including a hull provided with the liquefied gas storage tank and an engine unit for providing driving force.

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