Vessel including liquefied gas storage tank

Abstract

The liquefied gas storage tank according to the present invention comprises a tank body (100) for storing liquefied gas, a water-blocking partition (200) installed inside the tank body (100) to suppress the flow of liquefied gas, and an insulation section (300) located on the outer wall of the tank body (100) corresponding to a joint (CP) between the inner wall of the tank body (100) and the water-blocking partition (200). In a large-scale liquefied gas storage tank (TK), the main point is to prevent the cold heat of the liquefied gas from affecting the hull (S) by installing the insulation section (300) on the outer wall of the tank body (100) corresponding to a joint (CP) between the inner wall of the tank body (100) and the water-blocking partition (200).

Description

Technology Field

[0001] The present invention relates to a liquefied gas storage tank and a ship including the same, and more specifically, to a liquefied gas storage tank including a water-blocking bulkhead and a ship including the same. More specifically, the invention relates to a liquefied gas storage tank and a ship including the same in which a water-blocking bulkhead is installed to prevent an increase in the flow pressure of liquefied gas in a large-scale liquefied gas storage tank, to prevent deformation and destruction, thereby reducing the temperature drop of the hull and the rate of natural vaporization (BOR), and preventing damage to the hull caused by leaked liquid. Background Technology

[0002] Generally, natural gas is transported in a gaseous state through onshore or offshore gas pipelines, or transported to distant destinations in the state of liquefied natural gas (hereinafter referred to as LNG) while stored in LNG carriers.

[0003] This LNG is obtained by cooling natural gas to cryogenic temperatures (approximately -163°C), and since its volume is reduced to approximately 1 / 600 of that of natural gas in its gaseous state, it is highly suitable for long-distance transportation by sea. Storage tanks (commonly referred to as 'cargo tanks') for storing LNG in a cryogenic state may be installed within offshore structures such as LNG carriers, LNG regasification vessels (RVs), LNG FPSOs (Floating, Production, Storage and Offloading), and LNG FSRUs (Floating Storage and Regasification Units) that transport or store this LNG at sea. Additionally, in the case of vessels propelled by this LNG as fuel, storage tanks may be installed to serve as fuel tanks for utilizing LNG as fuel.

[0004] LNG storage tanks can generally be classified into independent type storage tanks and membrane type storage tanks. Independent type storage tanks are classified into Type A, Type B, and Type C, Type B is classified into MOSS type and SPB type, and membrane type storage tanks are classified into NO 96 type and MARK III type.

[0005] Since LNG is stored in a liquid state inside these LNG storage tanks, liquid sloshing occurs as the ship moves.

[0006] In particular, in the case of membrane-type storage tanks, an insulation layer must be installed inside the tank, so it is necessary to increase the strength of the tank walls and insulation material, which increases costs.

[0007] However, if the size of the LNG storage tank is increased to reduce the burn-out rate (BOR) and manufacturing costs, the fluidity of the liquid also increases, requiring a high-strength LNG storage tank, which increases manufacturing costs and manufacturing time.

[0008] If the pressure load caused by this liquid flow becomes excessive on the inner wall of the LNG storage tank, deformation or rupture of the tank may occur. To prevent this, it is necessary to install a swash bulkhead inside the LNG storage tank to reduce the flow of LNG. Prior art literature

[0009] Korean Registered Patent Publication No. 10-0310898 (Oil tanker equipped with a watertight bulkhead, published Dec. 17, 2001) The problem to be solved

[0010] The objective of the present invention is to provide a liquefied gas storage tank and a vessel including the same, which can prevent an increase in the flow pressure of liquefied gas in a large-scale liquefied gas storage tank, prevent deformation and destruction by installing a water-blocking bulkhead, thereby reducing the temperature drop and natural vaporization rate (BOR) of the hull and preventing damage to the hull caused by leakage. means of solving the problem

[0011] To achieve the aforementioned purpose, one embodiment of the present invention provides a liquefied gas storage tank comprising: a tank body (100) for storing liquefied gas; a water barrier (200) installed inside the tank body (100) for suppressing the flow of the liquefied gas; and an insulation portion (300) located on the outer wall of the tank body (100) corresponding to a joint (CP) between the inner wall of the tank body (100) and the water barrier (200).

[0012] Here, the width (W3) of the insulation section (300) may be larger than the width (W1) of the water barrier (200).

[0013] At this time, a leakage fluid transfer pipe (400) may be further included, which is installed along the joint (CP) and provides a path for the leakage fluid leaking from the tank body (100) to be transferred.

[0014] And, the width (W2) of the above leakage fluid transfer pipe (400) may be smaller than the width (W3) of the above insulation part (300).

[0015] In addition, the insulation part (300) can cover the leakage fluid transfer pipe (400).

[0016] Additionally, the insulation part (300) may include an insulation foam or an insulation pad.

[0017] Additionally, it may further include a leakage fluid auxiliary storage unit (500) connected to the leakage fluid transfer pipe (400) and storing the leakage fluid.

[0018] At this time, the insulation part (300) can cover the leakage fluid auxiliary storage part (500).

[0019] In addition, the above-mentioned water barrier (200) may be high-manganese steel or low-temperature steel such as SUS.

[0020] In addition, the above liquefied gas may be any one of liquefied natural gas, liquefied petroleum gas, liquefied ammonia, liquefied hydrogen, liquefied carbon dioxide, liquefied oxygen, liquefied nitrogen, liquefied helium, liquefied argon, and liquefied acetylene.

[0021] Meanwhile, another embodiment of the present invention comprises a hull (S); and a liquefied gas storage tank (TK) installed on the hull (S) and storing liquefied gas, wherein the liquefied gas storage tank (TK) provides a vessel to which the aforementioned liquefied gas storage tank is applied. Effects of the invention

[0022] A liquefied gas storage tank and a ship including the same according to one embodiment of the present invention can prevent the cold heat of the liquefied gas from affecting the hull by installing a water-blocking bulkhead in the enlarged liquefied gas storage tank to prevent an increase in the flow pressure of the liquefied gas and to prevent deformation and destruction, and by installing an insulating part on the outer wall of the tank body corresponding to the joint between the inner wall of the tank body and the water-blocking bulkhead.

[0023] Therefore, since it is not necessary to manufacture high-strength liquefied gas storage tanks to prevent an increase in the flow pressure of liquefied gas in large-scale liquefied gas storage tanks, manufacturing costs and manufacturing time can be reduced.

[0024] In addition, by installing a leaked liquid transfer pipe and an auxiliary leaked liquid storage unit, the temperature of surrounding structures can be prevented from dropping due to cryogenic leaked liquid that may occur at the joint between the inner wall of the tank body and the water barrier, thereby ensuring the safety of the hull and surrounding structures. Brief explanation of the drawing

[0025] FIG. 1 is a schematic drawing of a ship including a liquefied gas storage tank according to one embodiment of the present invention. FIG. 2 is a front cross-sectional view of a ship according to one embodiment of the present invention. FIG. 3 is a side cross-sectional view of a liquefied gas storage tank according to one embodiment of the present invention. Figure 4 is an enlarged view of part A of Figure 2. Specific details for implementing the invention

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0027] Hereinafter, a liquefied gas storage tank according to one embodiment of the present invention and a vessel including the same will be described in detail with reference to the drawings.

[0028] FIG. 1 is a schematic drawing of a ship including a liquefied gas storage tank according to one embodiment of the present invention, and FIG. 2 is a front cross-sectional view of a ship according to one embodiment of the present invention.

[0029] As illustrated in FIGS. 1 and 2, a vessel including a liquefied gas storage tank according to one embodiment of the present invention includes a hull (S) and a liquefied gas storage tank (TK).

[0030] The hull (S) may include various hulls, such as the hull of a liquefied gas carrier or the hull of a liquefied gas fuel propulsion vessel.

[0031] The liquefied gas storage tank (TK) may be an IMO type B storage tank. The IMO type B liquefied gas storage tank (TK) may be spherical or rectangular and may include a primary barrier and a partial secondary barrier (drip tray) that covers only the parts of the primary barrier where cracking is relatively likely. The liquefied gas storage tank (TK) may be installed inside the hull (S).

[0032] Typically, in the case of a ship including a liquefied gas storage tank, that is, a liquefied gas carrier, four liquefied gas storage tanks may be installed along the longitudinal direction of the ship. In this embodiment, three liquefied gas storage tanks (TK) are shown installed to illustrate an example of a large-scale liquefied gas storage tank, but this is not necessarily limited to this number, and various numbers of liquefied gas storage tanks (TK) may be installed.

[0033] In addition, the liquefied gas storage tank according to the present invention is described with reference to a liquefied gas storage tank of a liquefied gas carrier, but is not limited thereto and may also include a storage tank as a fuel tank of a liquefied gas fuel propulsion vessel.

[0034] Meanwhile, as mentioned above, when large-sized liquefied gas storage tanks are applied to a liquefied gas carrier and three liquefied gas storage tanks (TK) are installed, the flow pressure of the liquefied gas (sloshing load) in the storage tanks increases by approximately 25%.

[0035] Accordingly, the liquefied gas storage tank according to the present invention comprises a tank body (100) for storing liquefied gas, a water-blocking partition (200) installed inside the tank body (100) to suppress the flow of liquefied gas, and an insulation section (300) located on the outer wall of the tank body (100) corresponding to a joint (CP) between the inner wall of the tank body (100) and the water-blocking partition (200). In a large-scale liquefied gas storage tank (TK), by installing the insulation section (300) on the outer wall of the tank body (100) corresponding to the joint (CP) between the inner wall of the tank body (100) and the water-blocking partition (200), the water-blocking partition is installed to prevent an increase in the flow pressure of liquefied gas in the large-scale liquefied gas storage tank, to prevent deformation and destruction, thereby reducing the temperature of the hull and the natural vaporization rate (BOR), and preventing damage to the hull caused by leakage liquid.

[0036] Hereinafter, a liquefied gas storage tank according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0037] FIG. 3 is a side cross-sectional view of a liquefied gas storage tank according to one embodiment of the present invention, and FIG. 4 is an enlarged view of part A of FIG. 2.

[0038] As illustrated in FIGS. 2 to 4, a liquefied gas storage tank according to one embodiment of the present invention includes a tank body (100), a swash bulkhead (200), an insulation section (300), a leaked liquid transfer pipe (400), and a leaked liquid auxiliary storage section (500).

[0039] The tank body (100) can store liquefied gas inside it. The tank body (100) may be an IMO type B storage tank body.

[0040] Liquefied gas may include any one of liquefied natural gas, liquefied petroleum gas, liquefied ammonia, liquefied hydrogen, liquefied carbon dioxide, liquefied oxygen, liquefied nitrogen, liquefied helium, liquefied argon, and liquefied acetylene, but is not limited thereto.

[0041] A water-blocking partition (200) can be installed inside the tank body (100). The edge of the water-blocking partition (200) can be joined to the inner wall of the tank body (100). At this time, a plurality of partition holes (200a) may be formed in the water-blocking partition (200) so that liquefied gas can flow easily. Such a water-blocking partition (200) can suppress the flow of liquefied gas present inside the tank body (100) to the maximum extent, thereby preventing an increase in the flow pressure of liquefied gas in a large-scale liquefied gas storage tank, and preventing deformation and destruction.

[0042] The water barrier (200) may be made of low-temperature steel that is not damaged even when in contact with low-temperature liquefied gas. The low-temperature steel may include high-manganese steel, SUS, etc.

[0043] In this embodiment, only one water barrier (200) traversing the tank body (100) is shown, but it is not necessarily limited thereto and may be formed by traversing the tank body (100) or by a plurality of water barriers (200).

[0044] The insulation section (300) may be located on the outer wall of the tank body (100) corresponding to the joint (CP) between the inner wall of the tank body (100) and the water barrier (200). However, it is not necessarily limited to this, and the insulation section (300) may also be installed on the inner wall of the tank body (100) corresponding to the joint (CP).

[0045] The width (W3) of the insulation section (300) may be larger than the width (W1) of the water barrier (200). Accordingly, the insulation section (300) can insulate the tank body (100), which is connected to the water barrier (200) that is cooled by direct contact with the liquefied gas, from the hull (S). In this way, since the part of the tank body (100) connected to the water barrier (200) is insulated from the hull (S) by the insulation section (300), the cold heat of the liquefied gas can be blocked from affecting the hull (S). Therefore, since it is not necessary to manufacture a high-strength liquefied gas storage tank to prevent an increase in the flow pressure of the liquefied gas in a large-scale liquefied gas storage tank, and to prevent deformation and destruction, manufacturing costs and manufacturing time can be reduced.

[0046] The insulation section (300) may include insulation foam or insulation pads. The insulation foam is formed through a spray process or polyurethane foam prefabrication, and the insulation pad can be formed by attaching it to the outer wall of the tank body (100). The insulation pad may be composed of plywood and insulation materials.

[0047] The thickness of such insulation (300) can be determined by considering the temperature of the liquefied gas, the external temperature, and the natural vaporization rate (Boil Off Rate, BOR) conditions.

[0048] A leaked liquid transfer pipe (400) can be installed along the joint (CP). Since the joint (CP) between the inner wall of the tank body (100) and the water barrier (200) is formed by welding, there is a possibility of leaked liquid occurring if a crack forms in the weld. Therefore, a leaked liquid transfer pipe (400) can be installed along the joint (CP). The leaked liquid transfer pipe (400) can provide a path for the leaked liquid leaking from the tank body (100) to be transferred. At this time, the width (W2) of the leaked liquid transfer pipe (400) may be smaller than the width (W3) of the insulation section (300) and larger than the width (W1) of the water barrier (200). Preferably, the leaked liquid transfer pipe (400) can be formed to cover the size of the crack in the joint (CP), that is, the weld. Thus, the insulation section (300) can cover the leaked liquid transfer pipe (400).

[0049] The leaked liquid auxiliary storage unit (500) is connected to the leaked liquid transfer pipe (400) and can temporarily collect and store the leaked liquid transferred through the leaked liquid transfer pipe (400). The leaked liquid auxiliary storage unit (500) may be located between the bottom of the tank body (100) and the insulation unit (300). This leaked liquid auxiliary storage unit (500) may be covered by the insulation unit (300). Thus, the cold heat of the leaked liquid stored in the leaked liquid auxiliary storage unit (500) can be blocked from affecting the hull (S). This leaked liquid auxiliary storage unit (500) may be a sump well.

[0050] Meanwhile, the leaked liquid temporarily stored in the leaked liquid auxiliary storage unit (500) can be poured onto a drip tray (not shown) installed on the hull (S). The drip tray (not shown) can prevent the leaked liquid in a cryogenic state stored in the leaked liquid auxiliary storage unit (500) from being poured onto the hull (S) and causing damage to the hull (S).

[0051] In this way, the liquefied gas storage tank according to one embodiment of the present invention and the vessel including the same can block the cold heat of the liquefied gas from affecting the hull (S) by installing an insulating part (300) on the outer wall of the tank body (100) corresponding to the joint (CP) between the inner wall of the tank body (100) and the water barrier (200).

[0052] In addition, by installing a leaked liquid transfer pipe (400) and a leaked liquid auxiliary storage unit (500), the temperature of the surrounding structure can be prevented by the cryogenic leaked liquid that may occur at the joint (CP) between the inner wall of the tank body (100) and the water barrier (200), thereby ensuring the safety of the hull and surrounding structure.

[0053] The present invention has been described above with reference to the embodiments illustrated in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope equivalent to the present invention are possible by those skilled in the art to which the present invention pertains. Accordingly, the true scope of protection of the present invention should be determined by the following claims. Explanation of the symbols

[0054] S: Hull TK: Liquefied gas storage tank 100: Tank body 200: Water cutoff bulkhead 300: Insulation section 400: Leakage fluid transfer pipe 500: Leakage fluid auxiliary storage unit

Claims

Claim 1 delete Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 Hull (S); and three membrane-type liquefied gas storage tanks (TK) installed on the hull (S) for storing liquefied gas; wherein the hull (S) has a structure in which four liquefied gas storage tank spaces are divided and arranged into three; and among the three liquefied gas storage tanks (TK), one or more of the remaining two liquefied gas storage tanks (TK), excluding the one liquefied gas storage tank (TK) positioned at the foremost side, each liquefied gas storage tank (TK) comprises: a tank body (100) for storing liquefied gas; a water-blocking bulkhead (200) installed inside the tank body (100), installed in the width direction of the tank body (100) at the center of the front-rear longitudinal direction of the tank body (100) to suppress the flow of the liquefied gas in the front-rear longitudinal direction of the tank body (100); and corresponding to the joint (CP) between the inner wall of the tank body (100) and the water-blocking bulkhead (200), the It includes an insulation section (300) located on the outer wall of the tank body (100), and further includes a leakage liquid transfer pipe (400) installed along the joint (CP) in the width direction of the tank body (100) and providing a path for transferring leakage liquid leaking from the tank body (100); the insulation section (300) covers the leakage liquid transfer pipe (400) and is connected to the leakage liquid transfer pipe (400) and is located at the center in the width direction of the tank body (100) and further includes a leakage liquid auxiliary storage section (500) for temporarily storing the leakage liquid; the insulation section (300) covers the leakage liquid auxiliary storage section (500); the width direction of the tank body (100) is parallel to the width direction of the hull (S), and the front-to-back length direction of the tank body (100) is parallel to the bow-to-stern direction of the hull (S); and the leakage liquid auxiliary A ship comprising a liquefied gas storage tank, wherein the storage section (500) is a sump well, and the sump well is installed at the center of the width direction and the center of the front and rear length direction of the tank body (100) to temporarily store the leaked liquid and then drip it onto a drip tray. Claim 12 A ship including a liquefied gas storage tank, characterized in that, in claim 11, the width (W3) of the insulation section (300) is greater than the width (W1) of the water barrier (200). Claim 13 delete Claim 14 A ship including a liquefied gas storage tank, characterized in that, in claim 12, the width (W2) of the leakage liquid transfer pipe (400) is smaller than the width (W3) of the insulation part (300). Claim 15 delete Claim 16 A ship comprising a liquefied gas storage tank, wherein, in claim 11, the insulation part (300) comprises an insulation foam or an insulation pad. Claim 17 delete Claim 18 delete Claim 19 A ship comprising a liquefied gas storage tank, wherein, in claim 11, the above-mentioned bulkhead (200) is characterized as being high-manganese steel or low-temperature steel of SUS. Claim 20 A vessel comprising a liquefied gas storage tank, characterized in that, in any one of claims 11 to 12, 14, 16 and 19, the liquefied gas is one of liquefied natural gas, liquefied petroleum gas, liquefied ammonia, liquefied hydrogen, liquefied carbon dioxide, liquefied oxygen, liquefied nitrogen, liquefied helium, liquefied argon and liquefied acetylene.

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