Liquefied gas storage tank and ship including same

Abstract

The present invention provides a liquefied gas storage tank and a ship including same. An embodiment of the present invention includes: an accommodation unit having an inner space and including an upper body, an upper chamfer obliquely connected to both sides of the upper body, and a side body connected to the upper chamfer; and a cooling line disposed adjacent to the upper body in the inner space. The cooling line includes a storage tank having a first injection hole for injecting a refrigerant in a first direction and a second injection hole for injecting the refrigerant in a second direction different from the first direction.

Description

Liquefied gas storage tank and vessel containing same

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

[0002] Liquefied gas is stored in the ship's liquefied gas storage tank and transported to where it is needed or used as fuel for ship propulsion.

[0003] In order to inject liquefied gas into a liquefied gas storage tank, the liquefied gas storage tank must go through a cool down process to lower its temperature. Various methods of spraying refrigerant are being developed to improve the cooling effect.

[0004] The present invention aims to provide a liquefied gas storage tank and a vessel including the same. However, these tasks are exemplary and do not limit the scope of the present invention.

[0005] One aspect of the present invention provides a liquefied gas storage tank having an internal space, a receiving portion including an upper body, an upper chamfer connected to both sides of the upper body at an angle, and a side body connected to the upper chamfer, and a cooling line disposed adjacent to the upper body in the internal space, wherein the cooling line has a first injection hole for injecting refrigerant in a first direction and a second injection hole for injecting the refrigerant in a second direction different from the first direction.

[0006] According to one embodiment of the present invention, a liquefied gas storage tank and a vessel including the same include cooling lines arranged in the internal space of the receiving portion, thereby enabling a uniform cooling rate distribution of the liquefied gas storage tank. Of course, the scope of the present invention is not limited by these effects.

[0007] FIG. 1 is a drawing illustrating a storage tank according to one embodiment of the present invention.

[0008] Figure 2 is a cross-sectional view taken along line Ⅰ-Ⅰ` of Figure 1.

[0009] Figure 3 is an enlarged view of part A of Figure 2.

[0010] Figure 4 is a cross-sectional view taken along line Ⅱ-Ⅱ` of Figure 1.

[0011] Figure 5 is a drawing showing in detail some of the configurations of Figure 1.

[0012] Figure 6 is a drawing illustrating a vessel according to one embodiment of the present invention.

[0013] FIG. 7 is a drawing illustrating a movement path of a refrigerant sprayed during cooling of a storage tank according to one embodiment of the present invention.

[0014] FIG. 8 is a diagram showing the temperature distribution over time in a storage tank according to one embodiment of the present invention.

[0015] Figure 9 is a graph showing the temperature change in each part of the storage tank of Figure 8 over time.

[0016] One aspect of the present invention provides a liquefied gas storage tank having an internal space, a receiving portion including an upper body, an upper chamfer connected to both sides of the upper body at an angle, and a side body connected to the upper chamfer, and a cooling line disposed adjacent to the upper body in the internal space, wherein the cooling line has a first injection hole for injecting refrigerant in a first direction and a second injection hole for injecting the refrigerant in a second direction different from the first direction.

[0017] Additionally, the first injection hole and the second injection hole can inject refrigerant toward the top.

[0018] Additionally, the first injection hole can inject refrigerant toward the upper chamfer, and the second injection hole can inject refrigerant toward the upper body.

[0019] Additionally, the first injection angle at which the first injection hole injects the refrigerant toward the upper part can be determined according to the size of the inclination angle formed by the upper body and the upper chamfer.

[0020] Additionally, the first injection angle at which the first injection hole injects the refrigerant toward the top may be different from the second injection angle at which the second injection hole injects the refrigerant toward the top.

[0021] Additionally, the first injection angle may be smaller than the second injection angle.

[0022] Additionally, the cooling line may have a plurality of injection holes arranged in one direction.

[0023] Additionally, the cooling line may be arranged to face the upper body.

[0024] Additionally, the internal space is divided into a first region including the upper chamfer and a second region including the side body, and the cooling line can be arranged within the first region.

[0025] In addition, the cooling lines are provided in pairs, and the pair of cooling lines can be spaced apart from each other at a preset interval.

[0026] Additionally, the shortest distance between the pair of cooling lines and the side body may be smaller than the middle distance between the pair of cooling lines.

[0027] Additionally, the liquefied gas storage tank further includes a vapor line fluidly connecting the inner space and the exterior of the receiving portion, and the vapor line can be arranged adjacent to the cooling line.

[0028] In addition, the liquefied gas storage tank further includes a bulkhead arranged in the internal space, and the storage tank may have a symmetrical structure based on the bulkhead.

[0029] Another aspect of the present invention provides a ship including a hull and a liquefied gas storage tank arranged inside the hull, the liquefied gas storage tank having an internal space, a receiving portion including an upper body, an upper chamfer connected to both sides of the upper body at an angle, and a side body connected to the upper chamfer, and a cooling line arranged adjacent to the upper body in the internal space, the cooling line having a first injection hole for injecting a refrigerant in a first direction and a second injection hole for injecting the refrigerant in a second direction different from the first direction.

[0030] Additionally, the vessel may further include a hydraulic pump for supplying cooling water to the cooling line and a control unit for adjusting the output of the hydraulic pump according to the initial temperature of the liquefied gas storage tank and the structure of the storage tank.

[0031] The present invention is capable of various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, as well as the methods for achieving them, will become clearer with reference to the embodiments described in detail below, along with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms.

[0032] In the examples below, the terms first, second, etc. are not used in a limiting sense, but are used for the purpose of distinguishing one component from another.

[0033] In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0034] In the examples below, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not preclude the possibility that one or more other features or components may be added.

[0035] In the examples below, when a part such as a unit, region, or component is said to be on or above another part, this includes not only the case where it is directly above the other part, but also the case where another unit, region, component, etc. is interposed in between.

[0036] In the examples below, terms such as connect or combine do not necessarily mean a direct and / or fixed connection or combination of two members, unless the context clearly indicates otherwise, and do not exclude the presence of another member between the two members.

[0037] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the size and / or thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and therefore the present invention is not necessarily limited to what is shown.

[0038] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same drawing reference numerals, and redundant descriptions thereof will be omitted.

[0039] FIG. 1 is a drawing illustrating a storage tank according to one embodiment of the present invention.

[0040] In the following examples, the x-axis, y-axis, and z-axis are not limited to three axes on an orthogonal coordinate system, and can be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, but may also refer to different directions that are not orthogonal to each other. In the following, for convenience of explanation, it is defined that the plane formed by the x-axis and the y-axis is parallel to the lower body (110) of the storage tank (10), and the z-axis is in the height direction of the storage tank (10).

[0041] Referring to FIG. 1, a liquefied gas storage tank (hereinafter referred to as “storage tank”, 10) according to one embodiment of the present invention may include a receiving portion (100) and a cooling line (200).

[0042] The receiving portion (100) may have an internal space. The receiving portion (100) may have an internal space to store liquid fuel and protect the stored liquid fuel.

[0043] The receiving portion (100) can spatially separate the internal space from the exterior of the receiving portion (100). Each component forming the outer surface of the receiving portion (100) can be connected to each other to separate the internal space from the exterior space of the receiving portion (100). For example, each component forming the outer surface of the receiving portion (100) can be seamlessly connected to each other to fluidically separate the internal space from the exterior of the receiving portion (100). Thus, liquid fuel stored in the interior space of the receiving portion (100) can be prevented from leaking to the exterior.

[0044] The receiving portion (100) can thermally isolate the internal space from the exterior of the receiving portion (100). For example, each component forming the outer surface of the receiving portion (100) may be provided with an insulating material. Specifically, each component forming the outer surface of the receiving portion (100) may be formed of a multi-layer insulating material. Thus, the liquid fuel stored in the internal space of the receiving portion (100) can be stored in a liquid state.

[0045] The cooling line (200) can fluidly connect the internal space and the external space of the receiving portion (100). For example, the cooling line (200) has a hollow interior and is connected to one side of the receiving portion (100) so as to fluidly connect the internal space and the external space of the receiving portion (100) through the hollow interior. Thus, the cooling line (200) can provide a path through which a fluid can flow between the internal space and the external space. In other words, the cooling line (200) can provide a path through which a refrigerant can be transferred from the exterior to the internal space.

[0046] The cooling line (200) may be connected to one side of the receiving portion (100) and placed in the internal space. The cooling line (200) may be connected to one side of the receiving portion (100) and inserted into the interior of the receiving portion (100). For example, the cooling line (200) may be connected to one side of the front body (160A) and inserted into the interior of the receiving portion (100), thereby being placed in the internal space.

[0047] Although the drawing shows that the cooling line (200) is connected to one side of the front body (160A), the location where the cooling line (200) is connected to the receiving portion (100) is not limited thereto. For example, the cooling line (200) may be connected to the upper chamfer (140) or may be connected to the upper body (120) and placed in the internal space. However, for the convenience of explanation, the following description will focus on an embodiment where the cooling line (200) is connected to one side of the front body (160A) and inserted into the internal space.

[0048] In one embodiment, the storage tank (10) may further include a vapor line (VL).

[0049] The vapor line (VL) can fluidly connect the internal space and the external space of the receiving portion (100). For example, the vapor line (VL) can be connected to one side of the receiving portion (100) and inserted into the internal space, thereby fluidly connecting the internal space and the external space of the receiving portion (100) through a hollow space formed therein.

[0050] The vapor line (VL) can discharge fluid within the internal space to the outside when the pressure within the internal space exceeds a preset value. Thus, the structural stability of the storage tank (10) can be secured.

[0051] Figure 2 is a cross-sectional view taken along line Ⅰ-Ⅰ` of Figure 1.

[0052] Hereinafter, 'cooling efficiency' can be defined as the ratio of the temperature decrease of the receiving portion (100) to the amount of refrigerant delivered to the receiving portion (100).

[0053] Hereinafter, the 'cooling speed distribution' is defined as the distribution of the cooling speed for each part of the storage tank (10) when the storage tank (10) is cooled.

[0054] Referring to FIG. 2, a receiving portion (100) according to one embodiment of the present invention may include a lower body (110), an upper body (120), a lower chamfer (150), an upper chamfer (140), a front body (160A), and a rear body (160B).

[0055] The lower body (110) may be placed at the lowest end of the receiving portion (100). The lower body (110) may be placed at the lowest end of the receiving portion (100) and may come into contact with the platform on which the receiving portion (100) is placed. That is, the lower body (110) may transfer the load transmitted from each component of the receiving portion (100) to the platform on which the receiving portion (100) is placed, thereby supporting the receiving portion (100).

[0056] The upper body (120) may be positioned above the lower body (110). In other words, the upper body (120) may be positioned in the z-axis direction of the lower body (110). The upper body (120) may be positioned at a predetermined distance in the upper direction from the lower body (110).

[0057] The lower body (110) and the upper body (120) can together define the height of the receiving portion (100). Specifically, the lower body (110) can be positioned at the lowest end of the receiving portion (100), and the upper body (120) can be positioned at the highest end of the receiving portion (100). That is, the distance between the lower body (110) and the upper body (120) can be the height of the receiving portion (100).

[0058] The side body (130) can be placed between the lower body (110) and the upper body (120). The side body (130) has a length corresponding to the distance between the lower body (110) and the upper body (120), and can be placed between the lower body (110) and the upper body (120).

[0059] The side bodies (130) may be provided as a pair. The side bodies (130) are provided as a pair, and each side body (130) may be respectively disposed on both sides of the lower body (110) and the upper body (120). In other words, the pair of side bodies (130) may be respectively disposed on one end in the y-axis direction and one end in the -y-axis direction of the lower body (110) and the upper body (120). Thus, the side bodies (130) may define the internal space of the receiving portion (100) together with the lower body (110) and the upper body (120).

[0060] The upper chamfer (140) can be connected to one side of the upper body (120) at an angle. The upper chamfer (140) can be connected to the upper body (120) by being arranged at an angle so as to have a preset angle with respect to the upper body (120).

[0061] The upper chamfer (140) can connect the upper body (120) and the side body (130) to each other. In detail, the upper chamfer (140) is arranged to be inclined with respect to the upper body (120) and the side body (130) so as to connect the upper body (120) and the side body (130) to each other. The upper chamfer (140) can alleviate the concentration of stress occurring between the upper body (120) and the side body (130) by gently connecting the upper body (120) and the side body (130). Thus, the upper chamfer (140) can improve the structural stability of the receiving portion (100).

[0062] The upper chamfer (140) may be provided as a pair. The upper chamfer (140) may be provided as a pair and connected to both sides of the upper body (120). The pair of upper chamfers (140) may be connected to one end in the y-axis direction and one end in the -y-axis direction of the upper body (120), respectively.

[0063] A pair of upper chamfers (140) can be connected to both sides of the upper body (120) and simultaneously connected to the side body (130). In other words, a pair of upper chamfers (140) can connect the upper body (120) and each of the side bodies (130) provided as a pair to each other.

[0064] The lower chamfer (150) can be connected to one side of the lower body (110) at an angle. The lower chamfer (150) can be connected to the lower body (110) by being arranged so as to have a preset angle with respect to the lower body (110).

[0065] The lower chamfer (150) can connect the lower body (110) and the side body (130) to each other. In detail, the lower chamfer (150) is arranged to be inclined with respect to the lower body (110) and the side body (130) so as to connect the lower body (110) and the side body (130) to each other. The lower chamfer (150) can alleviate the concentration of stress occurring between the lower body (110) and the side body (130) by gently connecting the lower body (110) and the side body (130). Thus, the lower chamfer (150) can improve the structural stability of the receiving portion (100).

[0066] The lower chamfer (150) may be provided as a pair. The lower chamfer (150) may be provided as a pair and connected to both sides of the lower body (110). The pair of lower chamfers (150) may be connected to one end in the y-axis direction and one end in the -y-axis direction of the lower body (110), respectively.

[0067] A pair of lower chamfers (150) can be connected to both sides of the lower body (110) and simultaneously connected to the side body (130). In other words, a pair of lower chamfers (150) can connect each of the lower body (110) and each of the side bodies (130) provided as a pair.

[0068] The front body (160A) can be connected to the lower body (110), the upper body (120), the side body (130), the upper chamfer (140), and the lower chamfer (150). The front body (160A) can be connected to each of the connected components to seal the internal space from the external space. In addition, the front body (160A) can support each of the connected components to improve the structural stability of the receiving portion (100).

[0069] The rear body (160B) may be arranged to face the front body (160A). For example, the rear body (160B) may be arranged to face the front body (160A) while being spaced apart from the front body (160A) in the -x-axis direction.

[0070] The rear body (160B) is connected to the lower body (110), upper body (120), side body (130), upper chamfer (140), and lower chamfer (150) to seal the internal space from the external space together with the front body (160A).

[0071] In one embodiment, the receiving portion (100) may further include a bulkhead (170) disposed in the internal space.

[0072] A bulkhead (170) may be placed between a pair of side bodies (130). The bulkhead (170) may be placed between the side bodies (130), and may connect the lower body (110) and the upper body (120) to each other. That is, the bulkhead (170) may transfer a load applied from the upper body (120) to the lower body (110), thereby supporting the upper body (120). Thus, the bulkhead (170) may improve the structural stability of the storage tank (10).

[0073] The partition wall (170) can connect internal spaces that are in contact with both sides of the partition wall (170). For example, the partition wall (170) can have a hollow space to connect an internal space positioned in the y-axis direction of the partition wall (170) and an internal space positioned in the -y-axis direction of the partition wall (170). The partition wall (170) can provide a space in which the refrigerant sprayed from the cooling line (200) can freely move within the receiving portion (100). Thus, the cooling rate distribution of the storage tank (10) by the refrigerant sprayed from the cooling line (200) can become uniform.

[0074] The internal space of the receiving portion (100) can be divided into a first region (A1) and a second region (A2). Specifically, the internal space of the receiving portion (100) can be divided into a first region (A1) and a second region (A2) located below the first region (A1). The internal space of the receiving portion (100) can be divided into a first region (A1) and a second region (A2) located in the z-axis direction of the first region (A1).

[0075] In one embodiment, the internal space of the receiving portion (100) may be divided into a first region (A1) including the upper chamfer (140) and a second region (A2) including the side body (130). For example, the internal space of the receiving portion (100) may be divided based on an imaginary plane that passes through a point where the upper chamfer (140) and the side body (130) are connected and is parallel to the lower body (110). In other words, the first region (A1) may be divided into a first region (A1) corresponding to the upper side of the imaginary plane among the internal space and a second region (A2) corresponding to the lower side of the imaginary plane.

[0076] The cooling efficiencies of the first region (A1) and the second region (A2) may be different. For example, the refrigerant sprayed from the cooling line (200) passes through the first region (A1) and enters the second region (A2), and since the low-temperature refrigerant remains in the second region (A2), the cooling rate of the second region (A2) may be faster than the cooling rate of the first region (A1). Thus, when the receiving unit (100) is cooled, the first region (A1) may be a relatively high-temperature region, and the second region (A2) may be a relatively low-temperature region.

[0077] A cooling line (200) is arranged in the internal space to supply refrigerant to the interior of the receiving portion (100). In detail, the cooling line (200) can lower the temperature of the receiving portion (100) by injecting refrigerant into the interior of the receiving portion (100) using the first injection hole (201) and the second injection hole (202) described later.

[0078] The cooling line (200) may have a shape that extends in one direction. The cooling line (200) may have a shape that extends in a direction parallel to the upper body (120) and the upper chamfer (140). For example, the cooling line (200) may have a shape that extends in the x-axis direction. That is, the distance that the cooling line (200) is spaced apart from the upper body (120) and the upper chamfer (140) may be maintained constant along the direction in which the cooling line (200) extends. Thus, the storage tank (10) may have a constant cooling rate along the x-axis direction during cooling.

[0079] The cooling line (200) may be arranged adjacent to the upper body (120). When refrigerant is sprayed from the cooling line (200), the refrigerant may cool the adjacent internal space while falling from the upper side to the lower side of the receiving portion (100). That is, by arranging the cooling line (200) adjacent to the upper body (120), the time required for the refrigerant to cool the interior of the receiving portion (100) until it reaches the lower body (110) may increase. Thus, the cooling efficiency of the storage tank (10) may be improved.

[0080] In one embodiment, the first distance (D1) by which the cooling line (200) is spaced from the upper body (120) may be smaller than the first length (L1) by which the point where the upper chamfer (140) and the side body (130) are connected is spaced from the upper body (120). In other words, the cooling line (200) may be located above the side body (130). In this case, the refrigerant sprayed from the cooling line (200) may move along a path adjacent to the upper body (120) and the upper chamfer (140). Thus, the cooling efficiency of the upper body (120) and the upper chamfer (140) may be improved.

[0081] In one embodiment, the cooling line (200) may be arranged within the first region (A1) of the internal space. The cooling line (200) may be arranged within the first region (A1) to set a refrigerant movement path so that the refrigerant passes through the first region (A1) when sprayed. That is, the cooling line (200) may increase the cooling efficiency of the high-temperature region by spraying the refrigerant in the relatively high-temperature region. Thus, the cooling efficiency of the storage tank (10) may be improved, and the cooling rate distribution of the storage tank (10) may be made uniform.

[0082] Hereinafter, the inner side of the receiving portion (100) is defined as the direction from the internal space toward the bulkhead (170) of the receiving portion (100), and the outer side of the receiving portion (100) is defined as the direction from the internal space toward the side body (130).

[0083] The cooling line (200) may be arranged at the lower portion of the upper body (120). In other words, the cooling line (200) may be arranged to face the upper body (120). By arranging the cooling line (200) to face the upper body (120), a gap between the upper chamfer (140) and the cooling line (200) may be secured. Thus, when a coolant is sprayed from the cooling line (200), the upper body (120) and the upper chamfer (140) may be cooled at a cooling rate corresponding to each other.

[0084] In one embodiment, the second separation distance (D2), which is the shortest distance between the cooling line (200) and the side body (130), may be smaller than the second length (L2) at which the point where the upper chamfer (140) and the side body (130) are connected is spaced from the side body (130). In other words, the cooling line (200) may be arranged inside the receiving portion (100) relative to the upper chamfer (140). In this case, the refrigerant sprayed from the cooling line (200) may move along a path adjacent to the side body (130) and the upper chamfer (140). That is, the refrigerant sprayed from the cooling line (200) may have a continuous path adjacent to the upper chamfer (140) and reach the lower body (110).

[0085] In one embodiment, the second distance (D2) at which the cooling line (200) is spaced from the side body (130) may correspond to the inner distance (SD) at which the cooling line (200) is spaced from the bulkhead (170). At this time, the degree to which the movement path of the refrigerant sprayed from the cooling line (200) is adjacent to the upper body (120), the upper chamfer (140), and the side body (130) may correspond to the degree to which the movement path of the refrigerant is adjacent to the bulkhead (170). Thus, the cooling rate distribution of the internal space where the cooling line (200) is arranged among the internal spaces divided by the bulkhead can be maintained uniformly.

[0086] A plurality of cooling lines (200) may be provided. The storage tank (10) is provided with a plurality of cooling lines (200) inserted into the receiving portion (100), so that more refrigerant can be injected into the receiving portion (100) during cooling. The storage tank (10) is provided with a plurality of cooling lines (200), so that the cooling speed of the storage tank (10) can be improved.

[0087] For example, the cooling lines (200) may be provided in pairs. The pair of cooling lines (200) are spaced apart at preset intervals, thereby supplying a uniform amount of refrigerant to each portion of the internal space. That is, the storage tank (10) is provided with a pair of cooling lines (200) to improve the cooling speed of the storage tank and to make the cooling speed of each portion of the storage tank (10) uniform.

[0088] A pair of cooling lines (200) may be arranged in a direction parallel to the upper body (120). A pair of cooling lines (200) may be arranged in a direction in which a pair of side bodies (130) are arranged. In other words, a pair of cooling lines (200) may be arranged in the y-axis direction. That is, even if the cooling lines (200) have a shape extending in the x-axis direction, the amount of refrigerant sprayed along the y-axis direction may be constant. Thus, the cooling speed of the storage tank (10) along the y-axis direction may be uniform.

[0089] The shortest distance between a pair of cooling lines (200) and a side body (130) may be smaller than the middle distance (S), which is the distance between the pair of cooling lines (200). In other words, the shortest distance between any one of the pair of cooling lines (200) and the adjacent side body (130) may be smaller than the middle distance (S). For example, the second separation distance (D2) may be shorter than the middle distance (S). At this time, the movement path of the refrigerant sprayed from the cooling line (200) may be set adjacent to the upper chamfer (140) and the side body (130), so that the cooling efficiency of the storage tank (10) may be improved.

[0090] In one embodiment, the storage tank (10) may further include a vapor line (VL). The vapor line (VL) may fluidly connect the internal space and the external space of the receiving portion (100).

[0091] The vapor line (VL) may be arranged adjacent to the cooling line (200) in the internal space. For example, the vapor line (VL) may be arranged parallel to the cooling line (200). In other words, the vapor line (VL) may be arranged parallel to the cooling line (200) in the y-axis direction. In this case, the same length can be used to install the vapor line (VL) and the cooling line (200), thereby reducing time and cost when manufacturing the storage tank (10).

[0092] Although the drawing illustrates that the vapor line (VL) is arranged parallel to the cooling line (200) in the y-axis direction, this is not a limitation. For example, the vapor line (VL) may be located below the cooling line (200) or may be located above the cooling line (200).

[0093] In one embodiment, the storage tank (10) may have a symmetrical structure with respect to the partition wall (170). For example, the storage tank (10) may include a receiving portion (100) having a shape symmetrical with respect to the partition wall. The storage tank (10) may be provided with a pair of cooling lines (200), and the pair of cooling lines (200) may be arranged so that the distances apart from each partition wall (170) correspond to each other. In addition, the distances apart between the pair of cooling lines (200) and the side body (130) adjacent thereto may correspond to each other. That is, the storage tank (10) may have a symmetrical structure with respect to the partition wall (170) so that the cooling rates of the two internal spaces separated by the partition wall (170) correspond to each other.

[0094] Figure 3 is an enlarged view of part A of Figure 2.

[0095] Referring to FIG. 3, a cooling line (200) according to one embodiment of the present invention may have a first injection hole (201) and a second injection hole (202).

[0096] The first injection hole (201) and the second injection hole (202) are formed on the cooling line (200) to fluidly connect the interior of the cooling line (200) and the interior space of the receiving portion (100). The first injection hole (201) and the second injection hole (202) are formed on the cooling line (200) to provide a path through which the refrigerant moving along the cooling line (200) can be transferred to the interior space.

[0097] The first injection hole (201) may be formed on one side of the cooling line (200) and may have a shape extending along the first direction (DR1). The direction in which the refrigerant passing through the first injection hole (201) is injected may be determined by contacting the inner surface of the first injection hole (201). That is, the first injection hole (201) may inject the refrigerant in the first direction (DR1).

[0098] The second injection hole (202) may be formed on the other side of the cooling line (200) and may have a shape extending along the second direction (DR2). The direction in which the refrigerant passing through the second injection hole (202) is injected may be determined by contacting the inner surface of the second injection hole (202). That is, the second injection hole (202) may inject the refrigerant in the second direction (DR2).

[0099] The first injection hole (201) and the second injection hole (202) can inject refrigerant upward. In other words, the first direction (DR1) in which the first injection hole (201) extends and the second direction (DR2) in which the second injection hole (202) extends can be directed upward. That is, the refrigerant injected from the cooling line (200) can move to the internal space located above the cooling line (200) and cool the upper area of ​​the internal space. Thus, the cooling rate distribution along the z-axis direction of the storage tank (10) can be uniform.

[0100] The first injection hole (201) can spray the refrigerant toward the outside of the receiving portion (100). For example, the first injection hole (201) can spray the refrigerant toward the upper chamfer (140). In other words, the first direction (DR1) in which the first injection hole (201) sprays the refrigerant may be a direction toward the upper chamfer (140). In this case, the refrigerant sprayed from the first injection hole (201) can move toward the upper chamfer (140). The refrigerant sprayed from the first injection hole (201) can move along a movement path adjacent to the upper chamfer (140). Thus, the first injection hole (201) can improve the cooling speed of the upper chamfer (140).

[0101] The second injection hole (202) can inject refrigerant toward the inside of the receiving portion (100). For example, the second injection hole (202) can inject refrigerant toward the upper body (120). In other words, the second direction (DR2) in which the second injection hole (202) injects the refrigerant may be a direction toward the upper body (120). In this case, the refrigerant injected from the second injection hole (202) can move toward the upper body (120). The refrigerant injected from the second injection hole (202) can move along a path adjacent to the upper body (120). Thus, the second injection hole (202) can improve the cooling speed of the upper body (120).

[0102] The first injection hole (201) may have a first injection angle (C1) for injecting refrigerant toward the top. That is, the first injection angle (C1) may be an angle formed between the first direction (DR1) in which the first injection hole (201) injects refrigerant and the lower body (110). In other words, the angle formed by the first direction (DR1) and the y-axis may be equal to the first injection angle (C1).

[0103] The second injection hole (202) may have a second injection angle (C2) for injecting refrigerant upward. That is, the second injection angle (C2) may be an angle formed between the second direction (DR2) in which the second injection hole (202) injects refrigerant and the lower body (110). In other words, the angle formed by the second direction (DR2) and the y-axis may be equal to the first injection angle (C1).

[0104] In one embodiment, the first injection angle (C1) may be smaller than the approach angle (MC) formed by an imaginary perpendicular (IL) to the upper chamfer (140) passing through the center point of the cooling line (200) with respect to the lower body (110). In other words, the first injection angle (C1) may be smaller than the approach angle (MC) formed by the imaginary perpendicular (IL) and the y-axis. That is, the first injection hole (201) may have a first injection angle (C1) smaller than the approach angle (MC) so that the movement path of the refrigerant sprayed from the first injection hole (201) may be connected to the lower body (110). Thus, the upper and lower portions of the storage tank (10) may be cooled at a uniform rate by the refrigerant sprayed from the first injection hole (201).

[0105] In one embodiment, the first injection angle (C1) may be determined according to the size of the inclination angle (SC) formed by the upper body (120) and the upper chamfer (140). Since the distance between the cooling line (200) and the upper chamfer (140) varies depending on the inclination angle (SC), the movement path of the refrigerant injected from the first injection hole (201) can be appropriately set by setting the first injection angle (C1) differently depending on the inclination angle (SC).

[0106] For example, when the inclination angle (SC) is large, the first injection angle (C1) can be set small, and when the inclination angle (SC) is small, the first injection angle (C1) can be set large. In other words, when the distance between the cooling line (200) and the upper chamfer (140) is small, the first injection angle (C1) can be set small, and when the distance between the cooling line (200) and the upper chamfer (140) is large, the first injection angle (C1) can be set large. Thus, the refrigerant injected from the first injection hole (201) can have a movement path adjacent to the upper chamfer (140) and reach the lower chamfer (150).

[0107] In one embodiment, the first injection angle (C1) and the second injection angle (C2) may be different from each other. Since the structure of the receiving portion (100) facing the first injection hole (201) may be different from the structure of the receiving portion (100) facing the second injection hole (202), the movement path of the refrigerant sprayed from the first injection hole (201) and the movement path of the refrigerant sprayed from the second injection hole (202) may be set differently from each other. That is, the first injection angle (C1) and the second injection angle (C2) may be set differently from each other depending on the structure of the receiving portion (100) facing the first injection hole (201) and the second injection hole (202). Thus, the refrigerant sprayed from the first injection hole (201) and the second injection hole (202) may move along a path adjacent to the receiving portion (100) so that the cooling rate distribution of the storage tank (10) may be uniformly formed.

[0108] For example, the first injection angle (C1) may be smaller than the second injection angle (C2). The upper chamfer (140) facing the first injection hole (201) may be positioned lower than the upper body (120) facing the second injection hole (202). That is, the first injection angle (C1) for the refrigerant sprayed from the first injection hole (201) to have a movement path adjacent to the upper chamfer (140) may be smaller than the second injection angle (C2) for the refrigerant sprayed from the second injection hole (202) to have a movement path adjacent to the upper body (120). In other words, by setting the first injection angle (C1) to be smaller than the second injection angle (C2), the upper body (120) and the upper chamfer (140) may be cooled at corresponding cooling rates when the storage tank (10) is cooled.

[0109] Figure 4 is a cross-sectional view taken along line Ⅱ-Ⅱ` of Figure 1.

[0110] Referring to FIG. 4, a cooling line (200) according to one embodiment of the present invention can support a cooling line (200) extending in one direction.

[0111] The cooling line (200) is connected to the front body (160A) and inserted into the internal space, so that it can extend in one direction. In other words, the cooling line (200) can extend in the direction in which it is inserted into the internal space and be supported by each structure of the receiving portion (100).

[0112] For example, the cooling line (200) may be connected to and supported by a rear body (160B) that is positioned to face the front body (160A). Alternatively, the cooling line (200) may be supported by a support member (180) separately provided inside the receiving portion (100).

[0113] In one embodiment, the receiving portion (100) may further include a support member (180) that supports the cooling line (200).

[0114] The support member (180) may be installed on some structure of the receiving portion (100). The support member (180) may be connected to the upper body (120), but is not limited thereto. For example, the support member (180) may be installed on various structures of the receiving portion (100) that may be installed to support the cooling line (200), such as the upper chamfer (140). However, for the convenience of explanation, the following description will focus on an embodiment in which the support member (180) is connected to the upper body (120).

[0115] The support member (180) can be connected to the cooling line (200). One side of the support member (180) is connected to the upper body (120), and the other side is connected to the cooling line (200), so that the upper body (120) and the cooling line (200) can be connected to each other. That is, the support member (180) can transfer the load transferred from the cooling line (200) to the upper body (120). Thus, the support member (180) can support the cooling line (200) arranged in the internal space.

[0116] For example, the cooling line (200) can be inserted into a hole formed in the support member (180) and connected to the support member (180). That is, a hole having a size corresponding to the radius of the cooling line (200) is formed in the support member (180), so that the cooling line (200) inserted into the hole can be contact-supported. That is, the cooling line (200) can be contact-supported by the support member (180) and its position can be fixed within the internal space.

[0117] A plurality of support members (180) may be provided. The plurality of support members (180) may be arranged at preset intervals to support the cooling lines (200). For example, the plurality of support members (180) may be arranged at preset intervals along the direction in which the cooling lines (200) extend, to support each cooling line (200). Thus, the cooling lines (200) may be stably supported by the support members (180).

[0118] The cooling line (200) may be provided with a plurality of injection holes. The cooling line (200) may be provided with a plurality of first injection holes (201) and a plurality of second injection holes (202). The cooling line (200) may use the plurality of first injection holes and second injection holes (202) to inject a larger amount of refrigerant into the internal space of the receiving portion (100), thereby improving the cooling speed of the storage tank (10).

[0119] A plurality of first injection holes (201) and a plurality of second injection holes (202) may be arranged in each direction. In detail, the plurality of first injection holes (201) and the plurality of second injection holes (202) may be arranged in the direction in which the cooling line (200) extends. In other words, the plurality of first injection holes (201) and the plurality of second injection holes (202) may be arranged in the x-axis direction along each cooling line (200). Thus, the cooling rate distribution of the storage tank (10) in the x-axis direction by the refrigerant discharged from the cooling line (200) may become uniform.

[0120] Figure 5 is a drawing showing in detail some of the configurations of Figure 1.

[0121] Referring to FIG. 5, a cooling line (200) according to one embodiment of the present invention may have a plurality of first injection holes (201) and second injection holes (202) arranged in one direction.

[0122] The first injection hole (201) may have a radius of a preset size. In detail, the first injection hole (201) may have a first radius (R1). The injection speed and movement path of the refrigerant sprayed from the first injection hole (201) may be determined by the first radius (R1). For example, the injection speed of the refrigerant sprayed from the first injection hole (201) may be inversely proportional to the first radius (R1), and the maximum height of the movement path of the refrigerant may be inversely proportional to the first radius (R1).

[0123] A plurality of first injection holes (201) may be spaced apart from each other by a preset interval. In detail, the plurality of first injection holes (201) may be spaced apart from each other by a first interval (G1). The plurality of first injection holes (201) may be arranged in a direction in which the cooling line (200) extends, but may be spaced apart from each other by the first interval (G1). That is, the refrigerant sprayed from each of the first injection holes (201) does not interfere with each other, so that the cooling efficiency of the storage tank (10) by the refrigerant may be improved.

[0124] The second injection hole (202) may have a radius of a preset size. In detail, the second injection hole (202) may have a first radius (R1). The injection speed and movement path of the refrigerant injected from the second injection hole (202) may be determined by the second radius (R2). For example, the injection speed of the refrigerant injected from the second injection hole (202) may be inversely proportional to the second radius (R2), and the maximum height of the movement path of the refrigerant may be inversely proportional to the second radius (R2).

[0125] A plurality of second injection holes (202) may be spaced apart from each other by a preset interval. In detail, the plurality of second injection holes (202) may be spaced apart from each other by a second interval (G2). The plurality of second injection holes (202) may be arranged in a direction in which the cooling line (200) extends, but may be spaced apart from each other by the second interval (G2). That is, the refrigerant sprayed from each of the second injection holes (202) does not interfere with each other, so that the cooling efficiency of the storage tank (10) by the refrigerant may be improved.

[0126] The first interval (G1) and the second interval (G2) can determine the number of first injection holes (201) and second injection holes (202) arranged on the cooling line (200). In other words, when the length of the cooling line (200) is determined, the number of first injection holes (201) can be determined by the first interval (G1), and the number of second injection holes (202) can be determined by the second interval (G2). When the flow rate of the refrigerant delivered through the cooling line (200) is determined, the injection speed of the refrigerant is determined by the number of the first injection holes (201) and the second injection holes (202), and therefore, the first interval (G1) and the second interval (G2) can determine the injection speed of the refrigerant injected from the cooling line (200).

[0127] The first radius (R1) of the first injection hole (201) and the second radius (R2) of the second injection hole (202) may have corresponding sizes. Since the first radius (R1) and the second radius (R2) have corresponding sizes, the injection speed of the refrigerant injected from the first injection hole (201) and the injection speed of the refrigerant injected from the second injection hole (202) may have corresponding sizes. That is, by setting the size of the first radius (R1) to correspond to the size of the second radius (R2), the cooling speed of the storage tank (10) during cooling can become more uniform.

[0128] The size of the first gap (G1) at which the first injection holes (201) are spaced apart from each other may correspond to the size of the second gap (G2) at which the second injection holes (202) are spaced apart from each other. When the sizes of the first gap (G1) and the second gap (G2) correspond to each other, the number of the first injection holes (201) and the number of the second injection holes (202) may correspond to each other. In other words, when the sizes of the first gap (G1) and the second gap (G2) correspond to each other, the amount of the refrigerant sprayed from the first injection hole (201) and the amount of the refrigerant sprayed from the second injection hole (202) may correspond to each other. Thus, the outer and inner sides of the receiving portion (100) may have cooling rates that correspond to each other.

[0129] The first injection hole (201) or the second injection hole (202) may be arranged at a distance exceeding a preset size from the support member (180). The first injection hole (201) and the second injection hole (202) may be arranged at a minimum distance (I) from the support member (180). That is, the refrigerant is injected at a position at a minimum distance (I) from the support member (180) and moves along a preset movement path, thereby improving the cooling efficiency of the storage tank (10).

[0130] For example, the minimum gap (I) may be greater than half of the first gap (G1) or the second gap (G2), but may be less than the first gap (G1) or the second gap (G2). Since the minimum gap (I) has a value greater than half of the first gap (G1) or the second gap (G2), the refrigerant sprayed from the first injection hole (201) or the second injection hole (202) can be sprayed without interference by the support member (180), thereby improving the cooling efficiency of the storage tank (10). In addition, since the minimum gap (I) has a value smaller than the first gap (G1) or the second gap (G2), more first injection holes (201) and second injection holes (202) can be arranged on the cooling line (200).

[0131] The first injection holes (201) and the second injection holes (202) may be arranged alternately in the direction in which the cooling line (200) extends. The first injection holes (201) may be arranged between adjacent second injection holes (202), and the second injection holes (202) may be arranged between adjacent first injection holes (201). That is, the first injection holes (201) and the second injection holes (202) may be densely arranged on the cooling line (200), so that the amount of refrigerant injected from the cooling line (200) increases, thereby improving the cooling speed of the storage tank (10).

[0132] Figure 6 is a drawing illustrating a vessel according to one embodiment of the present invention.

[0133] The vessel (1) of the present invention is not limited to a specific purpose or function and can be applied in various industrial or commercial applications. For example, the vessel (1) may be an industrial vessel for logistics, such as an oil tanker or container ship, or a military vessel, such as a destroyer or frigate, but is not limited thereto.

[0134] Referring to FIG. 6, a vessel (1) according to one embodiment of the present invention may include a storage tank (10), a hull (20), a hydraulic pump (30), and a control unit (40).

[0135] The hull (20) may provide a space in which a storage tank (10), a hydraulic pump (30), and a control unit (40) may be placed. The hull (20) may also provide a space in which a power unit that provides propulsion to the vessel using fuel stored in the storage tank (10) may be placed. In addition, the hull may further include a cargo hold for loading cargo, etc.

[0136] The storage tank (10) can store fuel within it, thereby providing fuel for the vessel's voyage. Alternatively, the storage tank (10) can store fuel within it for transport. Furthermore, the storage tank (10) can also store chemicals that require transport.

[0137] A hydraulic pump (30) can inject refrigerant into a storage tank (10). The hydraulic pump (30) can transfer hydraulic energy to the refrigerant delivered to the storage tank (10), thereby forming the flow rate and hydraulic pressure of the refrigerant.

[0138] The hydraulic pump (30) can control the output to determine the flow rate and hydraulic pressure of the refrigerant injected into the storage tank (10). For example, if it is determined that the initial temperature of the storage tank (10) is high and more refrigerant needs to be delivered, the hydraulic pump (30) can have a high output to increase the flow rate of the delivered refrigerant.

[0139] The control unit (40) can control the output of the hydraulic pump (30). The control unit (40) generates a control signal for the hydraulic pump (30) and transmits the generated signal to the hydraulic pump (30) to control the output of the hydraulic pump (30).

[0140] The control unit (40) may be an electronic device capable of information processing, such as a desktop or laptop computer. Software for information processing may be installed in the control unit (40).

[0141] The control unit (40) can control the output of the hydraulic pump (30) according to the initial temperature of the storage tank (10). In other words, the control unit (40) can generate a control signal for the hydraulic pump (30) using the initial temperature of the storage tank (10). For example, if the control unit (40) determines that the initial temperature of the storage tank (10) is high, it can generate a control signal so that the hydraulic pump (30) has a high output. That is, if the initial temperature of the storage tank (10) is high, the control unit (40) can increase the cooling speed of the storage tank (10) by increasing the flow rate of the refrigerant delivered to the receiving unit (100).

[0142] The control unit (40) can adjust the output of the hydraulic pump (30) according to the structure of the storage tank (10). In other words, the control unit (40) can generate a control signal of the hydraulic pump (30) considering the structure of the storage tank (10).

[0143] In one embodiment, the control unit (40) can adjust the output of the hydraulic pump (30) by considering the inclination angle (SC) of the upper chamfer (140). The control unit (40) can generate a control signal so that the hydraulic pump (30) has a low output when the inclination angle (SC) of the upper chamfer (140) is large. Thus, the refrigerant sprayed from the cooling line (200) can have a movement path adjacent to the upper chamfer (140) and reach the lower body (110).

[0144] In another embodiment, the control unit (40) can adjust the output of the hydraulic pump (30) by considering the first injection angle (C1) or the second injection angle (C2). When the first injection angle (C1) or the second injection angle (C2) is large, the control unit (40) can generate a control signal so that the hydraulic pump (30) has a low output. Thus, the refrigerant injected from the cooling line (200) can have a movement path adjacent to the upper chamfer (140) or the upper body (120) and reach the lower body (110).

[0145] Without being limited thereto, the control unit (40) can adjust the output of the hydraulic pump (30) considering each structure of the storage tank (10). For example, the control unit (40) can adjust the output of the hydraulic pump (30) considering the first separation distance (D1), or can adjust the output of the hydraulic pump (30) considering the second separation distance (D2). In other words, the control unit (40) can adjust the output of the hydraulic pump (30) considering the position where the cooling line (200) is arranged within the storage tank (10) and the positions where the first injection hole (201) and the second injection hole (202) are arranged on the cooling line (200). Thus, the control unit (40) can uniformly form a cooling rate distribution of the storage tank (10) during cooling.

[0146] FIG. 7 is a drawing illustrating a movement path of a refrigerant sprayed during cooling of a storage tank according to one embodiment of the present invention.

[0147] Hereinafter, the 'upper part' of the receiving part (100) is defined as a part including the upper body (120) and the upper chamfer (140) among the receiving part (100), the 'middle part' is defined as a part including the side body (130) among the receiving part (100), and the 'lower part' is defined as a part including the lower body (110) and the lower chamfer (150) among the receiving part (100).

[0148] Referring to FIG. 7, when cooling a storage tank (10) according to one embodiment of the present invention, the refrigerant can descend along a preset movement path adjacent to each component of the receiving portion (100).

[0149] The refrigerant that has entered the interior of the receiving portion (100) can be sprayed upward from the cooling line (200), so that the upper portion of the receiving portion (100) can be cooled by the low-temperature refrigerant. The upper portion of the receiving portion (100) can be cooled by the relatively low-temperature refrigerant sprayed from the cooling line (200), so that the cooling speed can be improved. That is, the upper body (120) and the upper chamfer (140) can be cooled by the low-temperature refrigerant, so that the cooling speed can be improved.

[0150] The refrigerant sprayed from the cooling line (200) can move along a path adjacent to the upper body (120) and the upper chamfer (140). In detail, the low-temperature refrigerant sprayed from the cooling line (200) can move adjacent to the upper portion of the receiving portion (100) to improve the cooling speed of the upper portion of the receiving portion (100).

[0151] The refrigerant that has cooled the upper portion of the receiving portion (100) can descend and cool the remaining portion of the receiving portion (100). That is, the refrigerant at a low temperature can cool the upper portion of the receiving portion (100), and the refrigerant having a relatively high temperature after cooling the upper portion of the receiving portion (100) can cool the remaining portion of the receiving portion (100). In other words, the refrigerant at a low temperature can move within the first region (A1) to cool the receiving portion (100), and the refrigerant at a relatively high temperature can move within the second region (A2) to cool the receiving portion (100). Thus, the cooling rate distribution of the storage tank (10) can be formed uniformly.

[0152] FIG. 8 is a drawing showing a temperature distribution over time during cooling of a storage tank according to one embodiment of the present invention, and FIG. 9 is a graph showing a temperature change in each part of the storage tank of FIG. 8 over time.

[0153] Referring to FIGS. 8 and 9, a storage tank (10) according to one embodiment of the present invention can be cooled for a preset period of time. For example, the storage tank (10) can be cooled for 10 hours.

[0154] When a storage tank (10) according to one embodiment of the present invention is cooled, the temperature of each part of the storage tank (10) can be maintained uniformly. In other words, the temperature change of each part over time during cooling of the storage tank (10) can correspond to each other.

[0155] The storage tank (10) can receive refrigerant at a flow rate corresponding to the initial temperature of the storage tank (10) from the hydraulic pump (30). At this time, the refrigerant sprayed from the cooling line (200) of the storage tank (10) can move in the internal space along a preset path and cool the storage tank (10). At this time, the temperature change amount over time of each component of the receiving portion (100) and the temperature at each time can correspond to each other.

[0156] In one embodiment, when the initial temperature of the storage tank (10) is 40°C, the storage tank (10) can be cooled by receiving a corresponding amount of refrigerant from the hydraulic pump (30). In detail, when the refrigerant is sprayed into the internal space of the receiving portion (100), the temperature changes in the upper, middle, and lower portions of the receiving portion (100) can correspond to each other.

[0157] In other words, the slopes of the first temperature (T1) at the upper portion of the receiving portion (100), the second temperature (T2) at the middle portion, and the third temperature (T3) at the lower portion, as shown in the graph of FIG. 9, may be similar to each other. Accordingly, after cooling, the temperatures at the upper portion, middle portion, and lower portion of the storage tank (10) may be similar to each other. Thus, the stress generated due to temperature differences at each portion of the storage tank (10) can be alleviated, and the structural stability of the storage tank (10) can be improved.

[0158] A liquefied gas storage tank according to one embodiment of the present invention and a ship including the same can uniformly form a cooling rate distribution when cooling the liquefied gas storage tank by including a cooling line arranged in an internal space of a receiving portion, thereby minimizing a temperature difference between sections. A liquefied gas storage tank according to one embodiment of the present invention and a ship including the same can uniformly form a cooling rate distribution of the liquefied gas storage tank and improve cooling efficiency by determining the arrangement position of the cooling line arranged in the internal space of the receiving portion and the injection angle and arrangement position of the injection hole, thereby improving the structural stability of the liquefied gas storage tank.

[0159] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

[0160] Each of the embodiments described above can be implemented independently, but it goes without saying that the structure of each embodiment can be applied in combination to other embodiments.

[0161] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

[0162] The specific implementations described in the examples are merely examples and do not limit the scope of the examples in any way. Furthermore, unless specifically stated as "essential," "important," or the like, an element may not be absolutely necessary for the application of the present invention.

[0163] The use of the term "above" and similar referential terms in the specification of embodiments (especially in the claims) may refer to both singular and plural. In addition, if a range is described in the embodiments, the invention is intended to include individual values ​​falling within the range (unless otherwise stated), and each individual value constituting the range is described in the detailed description. Finally, unless the order of the steps constituting the method according to the embodiment is explicitly stated or otherwise stated to the contrary, the steps may be performed in any suitable order. The embodiments are not necessarily limited by the order in which the steps are described. The use of all examples or exemplary terms in the embodiments is merely intended to describe the embodiments in detail, and the scope of the embodiments is not limited by the examples or exemplary terms, unless otherwise defined by the claims. Furthermore, those skilled in the art will appreciate that various modifications, combinations, and variations may be made according to design conditions and factors within the scope of the appended claims or their equivalents.

[0164] According to one embodiment of the present invention, a liquefied gas storage tank and a vessel including the same can be applied to a storage tank storing and transporting liquefied gas and a vessel transporting the storage tank.

Claims

1. A receiving portion having an inner space, comprising an upper body, an upper chamfer inclinedly connected to both sides of the upper body, and a side body connected to the upper chamfer; and A cooling line disposed adjacent to the upper body in the internal space; The above cooling line a first injection hole for injecting refrigerant in a first direction; and A storage tank comprising a second injection hole for injecting the refrigerant in a second direction different from the first direction.

2. In paragraph 1, A storage tank in which the first injection hole and the second injection hole inject refrigerant toward the top.

3. In paragraph 1, The above first injection hole injects refrigerant toward the upper chamfer, A storage tank in which the second injection hole injects refrigerant toward the upper body.

4. In paragraph 2, The first injection angle at which the first injection hole injects the refrigerant toward the top is A storage tank, the size of which is determined by the size of the inclination angle formed by the upper body and the upper chamfer.

5. In paragraph 1, A storage tank, wherein the first injection angle at which the first injection hole injects the refrigerant toward the top is different from the second injection angle at which the second injection hole injects the refrigerant toward the top.

6. In paragraph 5, A storage tank wherein the first injection angle is smaller than the second injection angle.

7. In paragraph 1, The above cooling line A storage tank having a plurality of injection holes arranged in one direction.

8. In paragraph 1, A storage tank in which the above cooling line is arranged to face the upper body.

9. In paragraph 1, The above internal space is divided into a first region including the upper chamfer and a second region including the side body, A storage tank, wherein the cooling line is disposed within the first region.

10. In paragraph 1, A liquefied gas storage tank, wherein the above cooling lines are spaced apart in pairs at an intermediate distance from each other.

11. In paragraph 10, A liquefied gas storage tank, wherein the shortest distance between the cooling line and the side body is smaller than the intermediate distance.

12. In paragraph 1, A liquefied gas storage tank, further comprising a vapor line fluidly connecting the inner space and the exterior of the receiving portion and arranged adjacent to the cooling line.

13. In paragraph 1, A liquefied gas storage tank having a symmetrical structure based on a bulkhead arranged in the above-mentioned internal space.

14. Hull; and A storage tank disposed inside the hull; A receiving portion having an inner space, comprising an upper body, an upper chamfer connected to both sides of the upper body at an angle, and a side body connected to the upper chamfer; and A cooling line disposed adjacent to the upper body in the internal space; The above cooling line a first injection hole for injecting refrigerant in a first direction; and A vessel having a second injection hole for injecting the refrigerant in a second direction different from the first direction.

15. In paragraph 14, A hydraulic pump supplying cooling water to the above cooling line; and A ship further comprising a control unit for controlling the output of the hydraulic pump according to the initial temperature of the storage tank and the structure of the storage tank.

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