KR101336149B1 - Liquid Cargo Tank Having Rotation Unit Having Guide Part and Ship having the Same - Google Patents

Abstract

Disclosed is a liquefied storage tank having a rotating unit having a guide portion. The liquefied storage tank according to an embodiment of the present invention, the body and the support shaft is formed in the receiving space therein to accommodate the liquefied, and is installed on the support shaft to the liquefied natural gas in the receiving space upwards A rotating unit installed on the support shaft and provided on an upper portion of the rotating unit and controlling a flow direction of the liquefied liquid flowing upward by the rotating unit, and a rotating unit provided below the receiving space. It includes.

Description

Liquid cargo tank having a rotating unit having a guide portion and a vessel comprising the same {Liquid Cargo Tank Having Rotation Unit Having Guide Part and Ship having the Same}

The present invention is to prevent the sloshing of the storage tank, and more specifically, it is possible to prevent the sloshing in the interior according to the rotation unit which can control the direction in which the liquid flows in the body by the guide unit is provided separately Liquefied storage tank and a vessel comprising the same.

In general, liquefied liquids such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), crude oil, and the like are often transported and stored by various vessels. Here, the vessel has self-defense capability and not only a vessel for transferring liquefied liquid, but also a Liquefied Natural Gas-Floating Production Storage Offloading (LNG-FPSO) and a Floating Crude Oil Storage Facility (FSU). This includes floating offshore structures that store and unload liquids, such as storage offloading.

In particular, the liquefaction is carried in a state accommodated in various types of storage tank to be sealed and warmed to a predetermined pressure.

However, in such a case, the liquefied liquid receives kinetic energy in the storage tank due to the movement of the hull, and thus a sloshing phenomenon that impacts the inner wall of the storage tank occurs.

This causes damage to the storage tank and can result in economic losses as it impedes liquid cargo transportation. Therefore, in recent years, various studies have been actively conducted to suppress and prevent the sloshing phenomenon in the storage tank.

Referring to Figure 1, it is shown that the liquefied (1) is accommodated in the pair of storage tank (10a, 10b), respectively. In the case of the storage tank 10a located on the left side, the liquefied state is full, and in the case of the storage tank 10b located on the right side, the liquid level of the liquefied water is somewhat lowered.

Here, when the liquefied liquid contained in the storage tank is near full load, the damage caused by the sloshing phenomenon tends to be reduced. This is because the sloshing phenomenon is suppressed due to the limitation of the flow space when the liquid level is close to full load.

That is, since the left storage tank 10a of FIG. 1 is full, no sloshing phenomenon occurs or very little occurs. In the case of the right storage tank 10b, the sloshing damage is prevented with a certain amount of fluid space. It is expected.

On the other hand, during the operation of the carrier, the liquid in the storage tank may be partially evaporated for reasons such as temperature rise, pressure change and external impact, which is called a boil off gas.

That is, during operation of the carrier, the liquid level in the storage tank is gradually lowered due to the generation of the boil off gas, and if left unattended, damage may occur due to sloshing.

Therefore, a method for overcoming the above problems is required.

Embodiments of the present invention, by providing a separate rotary unit in the body of the liquefied storage tank to flow the liquefied upwards to prevent the sloshing occurs in the storage tank during the sea transport of liquefied.

In addition, it is intended to be able to provide a rotating unit to control the flow direction of the liquefied by the guide portion.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided in the inside of the body and the rotating portion for flowing the liquefied in the accommodation space according to the rotation and the body formed with a receiving space therein, the upper portion of the rotating portion is provided upward by the rotating part It includes a guide for controlling the flow direction of the liquefied to flow to, it may include a rotary unit provided in the lower portion of the receiving space.

In addition, the guide portion is formed long in the vertical direction, the lower portion may be formed to be able to adjust the angle from the support shaft in a state fixed to the support shaft.

The rotation unit may further include an angle adjuster provided between the support shaft and the guide part to be connected to the support shaft and the guide part to adjust an angle of the guide part.

In addition, the angle adjusting unit may be formed to be adjustable in length in the left and right directions.

In addition, the angle adjusting unit may be formed to be slidable in the vertical direction.

In addition, the rotation unit may be fixed to the bottom surface of the body.

The apparatus may further include a pump tower extending downward from an upper portion of the storage tank and extending in a vertical direction, and the rotating unit may be formed at a lower portion of the pump tower.

The apparatus may further include a rotation force providing unit configured to rotate and rotate the rotating unit by compressing and ejecting the boil off gas generated in the accommodation space at high pressure.

In addition, the rotational force providing unit, a compression unit for compressing the boil-off gas generated in the receiving space at high pressure, a storage unit for storing the high-pressure boil-off gas compressed by the compression unit, and connected with the storage unit And an opening / closing valve, the ejecting unit for ejecting the boil-off gas stored in the storage unit according to the opening / closing of the opening / closing valve, and a turbine for rotating the rotating unit by the boil-off gas ejected by the ejecting unit. can do.

In addition, the rotational force providing unit may include a combustion unit for rotating the rotating unit with the power obtained by burning the boil off gas generated in the receiving space.

In addition, the rotational force providing unit may further include an auxiliary supply unit for supplying the vaporized liquefaction.

In addition, the auxiliary supply unit may include an auxiliary tank containing a liquid supply for replenishment therein, and a vaporization unit for vaporizing the liquid supply for replenishment contained in the auxiliary tank to supply the rotational force providing unit.

In addition, the rotary unit may be provided in plurality.

In addition, the present invention may be a vessel including the liquefied storage tank as described above.

Embodiments of the present invention, by providing a rotating unit in the body, there is an advantage that can be suppressed sloshing phenomenon by dispersing energy as the liquid in the storage tank flows.

In addition, the rotary unit is provided with a guide portion, it is possible to control the flow direction of the liquefied liquid in the storage tank has the advantage that it is possible to optimize the sloshing phenomenon suppression efficiency according to various sea conditions.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a cross-sectional view showing a level change of a liquefied liquid contained in a general storage tank;
2 is a cross-sectional view showing the overall appearance of the liquefied storage tank according to the first embodiment of the present invention;
3 is a cross-sectional view showing in more detail the state of the rotary unit in the liquefied storage tank according to the first embodiment of the present invention;
4 is a cross-sectional view showing an overall view of a liquefied storage tank according to a second embodiment of the present invention;
5 is a cross-sectional view showing an overall view of a liquefied storage tank according to a third embodiment of the present invention;
6 is a cross-sectional view showing an overall view of a liquefied storage tank according to a fourth embodiment of the present invention;
7 is a cross-sectional view showing in more detail the state of the rotary unit in the liquefied storage tank according to the fifth embodiment of the present invention;
8 is a cross-sectional view showing in more detail the state of the rotary unit in the liquefied storage tank according to the sixth embodiment of the present invention;
9 is a cross-sectional view showing the overall appearance of the liquefied storage tank according to the seventh embodiment of the present invention; And
10 is a cross-sectional view illustrating in more detail the state of the rotating unit in the liquefied storage tank according to the seventh embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

First, the liquid cargo storage tank described in each embodiment of the present invention can be loaded on a variety of navigational, anchoring vessels or various offshore structures, including carriers. In addition, the following embodiments are representatively exemplified that the liquefied storage tank is loaded on the carrier, but this may be replaced by a ship or offshore structure other than the carrier, but is not limited thereto. In addition, the term "ship" in the present specification includes the various ships and offshore structures.

2 shows an overall view of a liquefied storage tank according to the first embodiment of the present invention. As shown, the liquefied storage tank according to the first embodiment of the present invention includes a body 100, a rotating unit 110.

Body 100 may have a variety of shapes according to the type of storage tank, there is formed a receiving space for receiving a liquid. In this case, the liquefaction may be a variety of liquids, such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), crude oil (crude oil).

On the other hand, as described in the technical part that is the background of the invention, when the liquefaction accommodated in the body 100 of the storage tank is near full load, damage due to the sloshing phenomenon is reduced. This is because the sloshing phenomenon is suppressed due to the limitation of the flow space when the liquid level is close to full load.

However, even when the liquefaction is carried in a full state, since the boil off gas (boil off gas) is continuously generated, the level of the liquefaction contained in the body 100 is reduced. Therefore, in the first embodiment of the present invention, the rotary unit 110 is provided to prevent the sloshing phenomenon from occurring because the liquid level is reduced by the boil off gas.

3, the appearance of the rotating unit 110 is shown in more detail. Referring to this, the rotary unit 110 is provided in the lower portion in the receiving space, the support shaft 112 and the rotating portion 114 which is installed in the support shaft 112 and flows the liquid contained in the receiving space in accordance with the rotation upwards And a guide part 116 for controlling the flow direction of the liquefied liquid flowing upward by the rotating part 114.

Here, in the case of the first embodiment, the rotating unit 110 is fixed to the bottom surface of the body 100 by the support shaft 112, but the lower portion in the receiving space is only the shape fixed to the body 100 Not limited, but also includes a state separated from the body (100).

In addition, the rotating unit 114 may be rotatably installed on the support shaft 112 in various forms, and generally may be implemented by a plurality of blades. That is, the liquefaction accommodated in the receiving space by the rotation of the rotary unit 114 in this way flows upward, and forms a kind of film by the fluid flow. Thereafter, the fluid flow due to the sloshing phenomenon passes through the fluid flow membrane and vortices are generated, thereby distributing energy, thereby reducing the sloshing load.

Therefore, since the rotary unit 110 is provided below the body 100, the sloshing phenomenon can be effectively suppressed.

In addition, the guide part 116 is provided on the upper part of the rotating part 114 so as to control the flow direction of the liquefaction flowing upward by the rotating part 114. In the case of the first embodiment, the guide portion 116 is formed long in the vertical direction, the lower portion is formed to be able to adjust the angle from the support shaft 112 in a state fixed to the support shaft 112. In addition, the guide portion 116 is formed in a curved shape over the entire length, it is possible to flow the liquefaction more smoothly.

That is, the guide portion 116 is formed to be able to adjust the distance from the support shaft 112, the remaining length portion based on the portion fixed to the support shaft 112. Therefore, the liquefaction flowing upward may change the flow direction along the angle of the guide portion 116. As a result, by controlling the movement of the guide unit 116 it is possible to quickly respond to a variety of maritime situation has the advantage that the efficiency of suppressing the sloshing phenomenon can be optimized.

In the following, in addition to the first embodiment to list other embodiments of the present invention implemented in various forms. In addition, detailed description of the same configuration overlapping between each embodiment will be omitted.

4, the overall view of the liquefied storage tank according to the second embodiment of the present invention is shown. In the second embodiment of the present invention, a rotation force providing unit 140 for driving such a rotation unit 110 is further provided. The rotational force providing unit 140 compresses the boil-off gas generated from the liquefaction contained in the receiving space, and ejects it to the rotating unit 110 to rotate the rotating unit. And various methods can be used to do this. For example, the rotary unit 110 may further include a turbine, and various methods may be used, such as a method of rotating a rotating unit by ejecting a high-pressure boil-off gas to the turbine using a nozzle or the like.

To this end, the rotational force providing unit 140 is a compression unit 122 for compressing the boil-off gas generated in the receiving space to a high pressure, and a storage unit for storing the high-pressure boil-off gas compressed by the compression unit 122 ( 124, connected to the storage unit 124, and provided with an on-off valve to eject the boil-off gas stored in the storage unit 124 to the rotating unit in accordance with the opening and closing of the opening and closing valve, by the ejecting unit And a turbine 127 which rotates the rotary part by the ejected boil off gas. In addition, a supply line 121 may be provided between the components to transmit the boil off gas.

That is, in the second embodiment, the ejecting unit 126 uses a method of ejecting a high-pressure boiloff gas under the control of the on / off valve, but the ejecting method is not limited thereto and may be performed by various means other than the on / off valve such as a nozzle. Of course, it can be implemented.

In addition, in the second embodiment, the gas passage valve 120 for selectively transmitting the boil off gas generated in the accommodation space to any one of an external boil off gas transport line or the compression unit 122 includes a body 100 and a compression unit. It is provided between the 122. Therefore, when the amount of the boil off gas stored in the storage unit 124 is sufficient, it can be discharged to the outside.

In addition, in the first embodiment, a resupply line 123 is further provided to recover the boil-off gas ejected to the turbine 127 and resupply it to the rotational force providing unit. In detail, the boil-off gas ejected by the ejecting unit 126 to rotate the turbine 127 may be recovered by the resupply line 123 to the compression unit 122. In this case, a separate gas oil valve 128 is also provided on the resupply line 123 to selectively transmit the boil-off gas.

As described above, according to the second embodiment of the present invention, the boil-off gas generated in the accommodation space is reused to prevent waste of liquefaction and at the same time to suppress the sloshing phenomenon by using the rotating unit 110. have.

5 shows an overall view of a liquefied storage tank according to the third embodiment of the present invention. In the case of the third embodiment, all components are the same as the second embodiment, but the rotational force providing unit 140 includes a combustion unit 129, and the resupply line 123 is not provided. It is different from the example.

That is, the second embodiment uses a method of burning the boil off gas as a means for rotating the rotating part of the rotating unit 110 and providing it to a power source such as an engine. In such a case, there is no need to compress the boil off gas to a high pressure in particular, so that the compression part 122, the blowing part 126, and the turbine 128 of the first embodiment need not be provided. In addition, since the boil off gas is burned by the combustion unit 129, the resupply line 123 of the first embodiment may also be omitted.

On the other hand, in the second embodiment, the rotation force providing unit 140 further includes a storage unit 124. However, such a storage unit 124 may be omitted if necessary.

6 shows an overall view of a liquefied storage tank according to the fourth embodiment of the present invention. In the case of other embodiments to be described below, including the fourth embodiment, the rotational force providing unit 140 of the second or third embodiment may be used in the same manner, and therefore, the same rotational force providing unit 140 will be described below. Figures and descriptions for the embodiments are omitted.

And, in the case of the fourth embodiment, unlike the first embodiment, a plurality of rotating units 110 are provided, and each rotating unit 110 may be in charge of a certain area to flow the liquefied liquid. In addition, in this case, in addition to the rotational force of each of the rotary unit 110 may use the interference by the adjacent rotary unit 110, it is possible to more effectively prevent sloshing.

In addition, if only a portion of the rotating unit 110 of the entire rotating unit 110 to rotate to provide a variety of patterns, there is an advantage that it is easy to apply in various situations.

Next, in Figure 7, the appearance of the rotary unit 210 provided in the liquefied storage tank according to the fifth embodiment of the present invention is shown in detail. In the case of the fifth embodiment, the angle adjusting unit 218 is further provided in the rotating unit 210 has a difference from the existing embodiments.

The angle adjuster 218 may be provided between the support shaft 212 and the guide portion 216 so as to be connected to the support shaft 212 and the guide portion 216, respectively, and adjust the angle of the guide portion 216. .

More specifically, in the fifth embodiment, the angle adjusting unit 218 is provided in the form extending in the left and right directions on the upper portion of the support shaft 212 and the guide portion 216, the length is adjustable in the left and right direction . Accordingly, the angle of the guide portion 216 can be adjusted.

Here, the angle adjusting unit 218 may have a form in which both ends are fixed to the support shaft 212 and the guide portion 216, respectively, but the portion connected to the guide portion 216 is not fixed but merely in a contact state. You can have it. In such a case, the angle adjusting part 218 may push the guide part 216 when the length is adjusted in the left and right direction and may be moved up and down slightly along the inner side of the guide part 216. And, the guide portion 216 is formed so that the material has an elastic force, or the portion coupled with the support shaft 212 has a restoring force to be restored to its original position when the length of the angle adjusting portion 218 is reduced Can be.

8, the state of the rotary unit 310 provided in the liquefied storage tank according to the sixth embodiment of the present invention is shown in detail. In the sixth embodiment, the angle adjusting unit 318 is further provided in the rotating unit 310 as in the fifth embodiment, but has a difference in the angle adjusting method.

Specifically, the angle adjusting unit 318 in the sixth embodiment is formed to be slidable in the vertical direction along the rotation axis 312, it is possible to adjust the angle of the guide portion 316. That is, the angle adjusting unit 318 has a certain length, but can be adjusted to the angle of the guide unit 316 as it slides to adjust the distance between the rotating shaft 312 and the guide portion 316 connecting portion.

Next, FIG. 9 shows an overall view of the liquefied storage tank according to the seventh embodiment of the present invention. In the seventh embodiment, the body 400 is provided with a pump tower 420 extending from the top to the bottom of the receiving space to extend in the vertical direction, the rotary unit 410 is fixed to the lower portion of the pump tower 420 do. Such a pump tower 420 is a component used for the transfer of liquefied cargo at the time of loading or unloading liquefied, when the rotary unit 410 is provided in the pump tower 420, the rotary unit 410 is the body 400 It can operate independently from the bottom of the

Referring to Figure 10, the appearance of the rotary unit 410 provided in the lower portion of the pump tower 420 is shown in more detail. In the case of the seventh embodiment, the pump tower 420 forms the support shaft of the other embodiment, and thus, the rotating part 414 and the guide part 416 are provided in the pump tower 420. In addition, the angle adjusting part 418 may also be provided between the guide part 416 and the pump tower 420.

On the other hand, although not shown, each of the above-described embodiments may further include an auxiliary supply unit (not shown) for supplying the vaporized liquefaction to the rotational force providing unit 140.

Specifically, the auxiliary supply unit may provide the rotational force providing unit 140 by vaporizing the liquefied liquid stored in a separate storage space when the amount of the boil off gas generated from the liquefied liquid contained in the body 100 is not sufficient. It is. Thus, even when the amount of the boil off gas is not sufficient, the rotating unit can be smoothly rotated.

As can be seen through each of the embodiments described above, the present invention can be implemented in various forms, and the components mentioned in each of the embodiments can be applied cross each other.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: Body
110: rotating unit
112: support shaft
114: rotating part
116: guide part
120: gas oil valve
121: supply line
122: compression unit
123: resupply line
124: storage unit
126: on-off valve

Claims (14)

A body in which an accommodation space for accommodating liquid is formed; And
A rotation unit for flowing the liquefied liquid in the accommodation space upwardly and a guide portion provided at an upper portion of the rotary portion to control a flow direction of the liquefied liquid flowing upward by the rotary portion, It includes; a rotating unit provided,
The guide portion is formed long in the vertical direction, liquefied storage tank, characterized in that the lower angle is fixed to the support shaft is formed to enable the angle adjustment from the support shaft. delete The method of claim 1,
The rotation unit includes:
And an angle adjusting part provided between the support shaft and the guide part so as to be connected to the support shaft and the guide part, and adjusting an angle of the guide part. The method of claim 3,
Wherein the angle-
Liquid storage tank characterized in that the length is adjustable in the left and right directions. The method of claim 3,
Wherein the angle-
A liquefied storage tank, characterized in that the sliding in the vertical direction. The method of claim 1,
The rotating unit is a liquid storage tank fixed to the bottom surface of the body. The method of claim 1,
Further comprising a pump tower extending from the upper portion of the storage tank to the lower portion in the vertical direction,
The rotating unit is a liquid storage tank, characterized in that formed in the lower portion of the pump tower. delete delete delete delete delete The method of claim 1,
The rotating unit is provided with a plurality of liquid storage tank. A vessel comprising the liquefied storage tank of any one of claims 1, 3-7, and 13.

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