KR101599299B1 - Active Support for Storage Tank for Liquid - Google Patents

Active Support for Storage Tank for Liquid Download PDF

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Publication number
KR101599299B1
KR101599299B1 KR1020140053444A KR20140053444A KR101599299B1 KR 101599299 B1 KR101599299 B1 KR 101599299B1 KR 1020140053444 A KR1020140053444 A KR 1020140053444A KR 20140053444 A KR20140053444 A KR 20140053444A KR 101599299 B1 KR101599299 B1 KR 101599299B1
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South Korea
Prior art keywords
storage tank
liquefied
support
liquefied storage
expansion
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KR1020140053444A
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Korean (ko)
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KR20150126174A (en
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유혜현
김태우
전민성
전춘식
조민규
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삼성중공업 주식회사
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Abstract

The present invention relates to an active support for a liquefied storage tank that actively controls the length of a supporter that supports a liquefied storage tank according to thermal displacement or pressure displacement of the liquefied storage tank and the amount of liquefied residue or the inclination of the ship And a control section for supporting a liquefied storage tank for storing the liquefied product to a supporting section for supporting the load of the hull skeleton or the liquefied storage tank and controlling expansion and contraction of the support and the support, A support is provided.

Description

[0001] The present invention relates to an active support for a liquid storage tank,

The present invention relates to an active support for a liquefied storage tank that actively controls the length of a supporter supporting a liquefied storage tank according to thermal displacement or pressure displacement of the liquefied storage tank and the amount of liquefied residue or the inclination of the ship .

In general, liquefied natural gas (LNG) is a colorless transparent cryogenic liquid which is cooled to a temperature of -162 ° C at atmospheric pressure to reduce the volume of methane (natural gas) , It is known that it is more economical for long-distance transportation because of better transportation efficiency than gas condition.

Such liquefied natural gas has been applied to large-scale and long-distance transportation in order to satisfy the economical efficiency due to the construction cost of the construction plant and carrier of the production plant. On the other hand, pipelines and CNG (Compressed Natural Gas) Is known to be economical. However, transportation using pipelines is subject to geographical restrictions, environmental problems can be caused, and CNG has a disadvantage of low transportation efficiency.

In addition, natural gas has a liquefaction point of -163 ° C at atmospheric pressure, and when the pressure is applied, the liquefaction point rises above atmospheric pressure. These characteristics can reduce the processing steps such as removal of acid gas and fractionation of NGL (Natural Gas Liquid) in the liquefaction process, resulting in reduction of equipment and facility capacity, Thereby reducing the production cost.

On the other hand, as shown in FIG. 1, such liquefied natural gas is generally transported through a ship 10, and recently, a ship using liquefied natural gas as fuel has been introduced. When liquefied natural gas is used as the fuel, it may be supplied to the propulsion engine 32 or the liquefied natural gas may be supplied to the power generation engine 34.

On the other hand, in order to transport such liquefied natural gas or to use it as fuel, a storage tank 20 is to be installed in the hull 10.

This storage tank 20 may be a storage tank 22 for transporting liquefied natural gas or a storage tank 24 for storing liquefied natural gas for use as fuel.

On the other hand, such liquefied natural gas is stored under the conditions of cryogenic temperature and super high pressure, whereby the storage tank 20 can expand or contract due to a temperature change or a pressure change.

In order to cope with cryogenic conditions and expansion / contraction of the storage tank 20, the storage tank 20 is placed on the saddle 40 and the saddle 40 is placed between the saddle 40 and the storage tank A heat insulating material 42 made of wood can be provided.

The saddle 40 supporting either the front end or the rear end of the storage tank 20 is fixed to the storage tank 20 and the other saddle 40 is configured to be simply supported so that the storage tank 20 is expanded and contracted So that sliding relative movement is possible according to the generated displacement.

However, the ship 10 may be inclined in various directions such as rolling, pitching, and yawing as shown in FIG. 3 depending on the sea condition due to the special nature of navigation on the water surface.

Accordingly, force and acceleration in various directions can be applied to the storage tank 20. This force is concentrated on the saddle 40 fixed to the storage tank 20, Or may be deformed.

In addition, the liquefied natural gas stored in the storage tank may also be swung along with the swirling of the ship 10, which causes the storage tank 20 to be damaged by the sloshing phenomenon. In addition, the structure of the storage tank needs to be reinforced to increase the production cost and hull weight.

In addition, when liquefied natural gas is used as fuel for propulsion, the liquefied natural gas is required to be continuously and stably supplied regardless of the length of the ship 10. However, when the amount of liquefied natural gas in the storage tank 20 is large, The point where the pipe from which the liquefied natural gas is discharged is connected to the water surface of the liquefied natural gas, so that the gaseous gas may be introduced instead of the liquid natural gas, which makes it difficult to supply the stable gas. When the remaining amount of the liquefied natural gas in the storage tank 20 is low, the water level is low and the probability of occurrence of such a problem may increase.

Korean Patent Laid-Open No. 10-2013-0042114

It is an object of the present invention to provide an active support for a liquefied storage tank capable of stably supporting a liquefied storage tank despite the thermal displacement of the liquefied storage tank or displacement due to pressure It is an assignment.

Another object of the present invention is to provide an active support for a liquefied storage tank capable of stably supplying a liquefied product even when the residual amount of liquefied product is small.

It is another object of the present application to provide an active support for a liquefied storage tank that is capable of minimizing sloshing of liquefied liquid in a liquefied storage tank despite the inclination of the ship.

The problems of the present application 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 a liquefied natural gas storage tank, comprising: a liquefied storage tank having a support for supporting a liquefied storage tank and a control unit for controlling expansion and contraction of the support; A support is provided.

The control unit may control expansion and contraction of the support in accordance with the expansion and contraction of the liquid storage tank.

The control unit may control the support so as to control the inclination of the tank in accordance with the amount of residual liquid cargo left in the liquid storage tank.

The control unit may control expansion and contraction of the support to control the inclination of the liquefied storage tank according to the inclination of the hull.

Meanwhile, a temperature measuring sensor for measuring the temperature of the liquefied storage tank is provided, and the controller calculates the thermal expansion and the heat shrinkage of the liquefied storage tank as the measured temperature from the temperature measuring sensor, Can be stretched and controlled.

Alternatively, a pressure measuring sensor for measuring the pressure of the liquefied storage tank may be provided, and the controller may calculate the expansion and contraction of the liquefied storage tank as the measured pressure from the pressure measuring sensor, Can be stretched and controlled.

Alternatively, a strain sensor for measuring the expansion and contraction of the liquefied storage tank may be provided, and the control unit may control expansion and contraction of the length of the support as the expansion and contraction amount measured from the strain sensor.

The liquefied storage tank may be provided with a residual amount measuring sensor for measuring the residual amount of the liquefied storage tank, and the controller may tilt the liquefied storage tank to one side when the residual loading amount measured by the residual amount measuring sensor is below a certain level The support can be stretched and controlled.

The support may be provided with an attitude measuring sensor for measuring the inclination of the hull, and the controller may control the support so that the liquefied product in the liquefied storage tank is horizontal as the inclination information of the hull measured by the attitude measuring sensor have.

The support includes a cylinder having a cylinder and one end inserted into the cylinder and the other end exposed to the outside and being expanded and contracted with respect to the cylinder under the control of the control unit. One end of the support is connected to the liquefied fuel tank, And may be respectively hinged to the hull.

The supports may be spaced apart from one another so as to support the front and rear ends or the left and right sides of the liquefied fuel tank, respectively.

According to the active support of the liquid storage tank of the present application, the following effects can be obtained.

First, the supporter actively shrinks due to the expansion and contraction of the liquefied storage tank due to temperature and pressure fluctuations, so that each supporter can be fixed to the liquefied storage tank and can respond to the expansion and contraction of the liquefied storage tank, The fixing of the storage tank can be made more rigid.

Second, the support can be expanded and contracted according to the residual amount in the liquefied storage tank, so that the liquefied storage tank can be inclined and the amount of residual fuel can be minimized.

Third, the support can be expanded and contracted so that the liquefied storage tank is inclined according to the inclination of the ship so that the liquefied product in the liquefied storage tank is leveled, thereby minimizing the slushing of the liquefied product in the liquefied storage tank.

The effects of the present application 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.

The foregoing summary, as well as the detailed description of the embodiments of the present application set forth below, may be better understood when read in conjunction with the appended drawings. Embodiments are shown in the figures for purposes of illustrating the present application. It should be understood, however, that this application is not limited to the precise arrangements and instrumentalities shown.
1 is a view showing a ship equipped with a conventional liquefied storage tank;
2 is a perspective view showing a liquefied storage tank mounted on a conventional saddle;
FIG. 3 is a perspective view showing a motion acting on a general ship; FIG.
FIG. 4 is a view of a vessel equipped with an active support of a liquefied storage tank according to an embodiment of the present application; FIG.
FIG. 5 illustrates the behavior of the active support according to the expansion and contraction of the liquefied storage tank of FIG. 4;
Figure 6 is a front view of Figure 6;
FIG. 7 is a view showing the behavior of the active support according to the residual liquefied amount of the liquefied storage tank of FIG. 4;
FIG. 8 is a side view of the behavior of the active support according to the slope of the ship in the liquefied storage tank of FIG. 4; And,
FIG. 9 is a front view showing the behavior of the active support according to the slope of the ship in the liquefied storage tank of FIG. 4. FIG.

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.

The active support 100 of the liquefied storage tank according to the present embodiment may include a support 110 and a control unit 120, as shown in FIG.

The support 110 is a component for supporting the liquefied storage tank 20 with respect to a separate supporting portion provided on the hull so as to support the load of the hull skeleton or the liquefied storage tank.

The liquefied storage tank 20 is a component for forming a space in which liquid liquefied material is stored. In this case, the liquefied material is transported and stored in a cryogenic liquid state such as LNG, LPG, or butane. And may be a gas for fuel used in a gaseous state. Further, it may be a liquefied gas in which a gas such as nitrogen is liquefied.

In the description of the present embodiment, the liquefied storage tank 20 will be described as an example of transporting liquefied fuel such as LNG, LPG, or butane, and may be mounted on a ship 10 And may be a tank mounted on the vessel for storing the used fuel of the vessel, such as supplied to the propulsion or power generation engine 30 of the vessel.

On the other hand, in order to transport LNG, LPG, or butane in a liquid state, it must be transported under an extremely low temperature and high pressure environment. Therefore, as shown in Fig. 5, the liquefied storage tank 20 for storing such liquefied material may undergo thermal expansion that expands and shrinks in accordance with a temperature change, and a displacement that expands and shrinks .

Meanwhile, the control unit 120 may be configured to control the expansion and contraction of the support 110.

The support 110 includes a cylinder 112 and a piston 114 having one end inserted into the cylinder 112 and the other end exposed to the outside and moving relative to the cylinder 112 so that the overall length is elongated or contracted Lt; / RTI >

The piston 114 may be moved relative to the cylinder 112 by hydraulic or pneumatic pressures formed in the cylinder 112, and a pump 116 may be provided to form the hydraulic or pneumatic pressure.

The operation of the pump 116 is controlled by the controller 120 so that the total length of the cylinder 112 and the piston 114 can be controlled by varying the hydraulic pressure or the air pressure formed in the cylinder 112 .

One end of the supporter 110 is hinged to the liquefied storage tank 20 and the other end of the supporter 110 supports the load of the liquefied storage tank 20 in the skeleton of the hull, And a plurality of supports 110 may be coupled to the front and rear sides, left and right sides of the liquefied storage tank 20, respectively.

Therefore, as shown in FIG. 5, even if the liquid storage tank 20 is expanded, contracted or inclined due to a temperature change, a pressure change, or the like, the fixing of the support 110 can be maintained, All the supports 110 can be fixed to the liquefied storage tanks without needing to fix only the portions, so that the liquefied storage tanks 20 can be fixed more stably.

Of course, the support 110 is not limited to the cylinder 112 and the piston 114 using hydraulic or pneumatic pressure, but may be variously constructed, for example, by using a motor (not shown) or the like .

In addition, one end and the other end of the support 110 may be provided to have at least two axes of rotation. This is because displacement due to expansion and contraction of the liquefied storage tank 20 occurs in a three-dimensional rather than in one direction. Needless to say, the present invention is not necessarily limited to this, and it may have one axis of rotation according to the position and number of the supports 110.

The control unit 120 can actively control the length of the support 110 according to the expansion and contraction of the liquid storage tank 20 due to a thermal change or a pressure change. 130).

As shown in FIG. 5, a temperature sensor 132 may be provided to measure the temperature of the liquefied storage tank 20 in order to determine the amount of displacement of the liquefied storage tank 20 in accordance with the change in temperature.

The control unit 120 stores the thermal expansion coefficient, shape and size information of the material forming the liquefied storage tank 20 as a temperature measured by the temperature measurement sensor 132, The thermal expansion and heat shrinkage displacement amount can be calculated.

The control unit 120 can calculate the appropriate length of the support 110 as the thermal expansion and heat shrinkage displacement of the liquid storage tank 20 as calculated so that the length of the support 110 can be controlled have.

5, a pressure measuring sensor 134 may be provided to measure the pressure of the liquefied storage tank 20 to determine the amount of displacement of the liquefied storage tank 20, have.

The control unit 120 stores information on the amount of displacement of the liquid storage tank 20 in accordance with the pressure of the liquid storage tank 20 so as to measure a pressure change of the liquid storage tank 20 as a pressure measured by the pressure measurement sensor 134 It is possible to calculate the expansion and contraction displacements of the support 110 and to calculate the appropriate length of the support 110 to perform expansion and contraction control.

Alternatively, a strain sensor 136 for directly measuring the expansion and contraction amount of the liquefied storage tank 20 may be provided. The strain sensor 136 may be disposed in the longitudinal direction or the circumferential direction of the liquefied storage tank 20 to directly measure the expansion and contraction amount of the liquefied storage tank 20. [

The controller 120 may control the length of the support 110 to expand and contract as an amount of expansion and contraction measured from the strain sensor 136.

Meanwhile, the controller 120 may actively control expansion and contraction of the support 110 by controlling the inclination of the liquefied storage tank 20 according to the internal liquefied residual capacity of the liquefied storage tank 20 .

In order to measure the residual load of the liquefied storage tank 20, as shown in FIG. 7, there is provided a residual amount measuring sensor 138 for measuring the internal liquefied residual load of the liquefied storage tank 20 And the control unit 120 may control the expansion and contraction of the support 110 to tilt the liquefied storage tank 20 when the residual load measured by the residual amount measurement sensor 138 is below a predetermined level.

At this time, the direction in which the liquefied storage tank 20 is inclined is a point where the liquefied product is discharged from the liquefied storage tank 20 at the lowest point, so that the residual liquefied product in the liquefied product storage tank 20 So that the liquid is collected at a point where the liquid is discharged.

Accordingly, when the liquefied storage tank 20 is a storage tank for storing the fuel of the ship, all of the internal residual fuel can be used without any waste.

The control unit 120 may control the expansion and contraction of the support 110 to control the inclination of the liquefied storage tank 20 according to the inclination of the ship 10.

3, the ship can be inclined in various directions such as rolling, yawing, and pitching due to various sea conditions such as a gas phase. In accordance with the inclination of the ship 10, The liquefied storage tanks 20 may also be tilted so that the liquefied products stored in the liquefied storage tanks 20 may also be sloshed.

8 and 9, there is provided an attitude measuring sensor 139 for measuring the inclination direction and the inclination angle of the hull, and the controller 120 measures the attitude of the hull, The support 110 can be stretched or shrunk such that the water surface of the liquefied material in the liquefied storage tank 20 becomes horizontal as inclination information such as the inclination direction and the inclination angle of the hull.

Therefore, it is possible to minimize the slippage of the liquefied material in the liquefied storage tank 20 by minimizing the tilting movement of the hull to the liquefied storage tank 20, The liquefied fuel can be more stably supplied when the liquefied storage tank 20 is a storage tank for storing the fuel of the ship.

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

10: Hull 20: Liquid storage tank
30: engine 100: active support of liquefied storage tank
110: Support 112: Cylinder
114: piston 116: pump
120: controller 130: sensor
132: Temperature measurement sensor 134: Pressure measurement sensor
136: Strain sensor 138: Residual amount measuring sensor
139: Attitude sensor

Claims (10)

A support for supporting the liquefied storage tank with respect to the hull;
A controller for controlling expansion and contraction of the supporter in accordance with expansion and contraction of the liquefied storage tank; And
And a temperature measurement sensor for measuring a temperature of the liquefied storage tank,
Wherein the controller calculates a thermal expansion and a thermal shrinkage of the liquefied storage tank as a temperature measured by the temperature measurement sensor, thereby controlling the length of the support. A support for supporting the liquefied storage tank with respect to the hull;
A controller for controlling expansion and contraction of the supporter in accordance with expansion and contraction of the liquefied storage tank; And
And a pressure measuring sensor for measuring a pressure of the liquefied storage tank,
Wherein the controller calculates the expansion and contraction of the liquefied storage tank as the measured pressure from the pressure measurement sensor, thereby controlling the length of the support accordingly. A support for supporting the liquefied storage tank with respect to the hull;
A controller for controlling expansion and contraction of the supporter in accordance with expansion and contraction of the liquefied storage tank; And
And a strain sensor for measuring an expansion and contraction amount of the liquefied storage tank,
Wherein the controller controls expansion and contraction of the length of the support as the amount of expansion and contraction measured from the strain sensor. 4. The method according to any one of claims 1 to 3,
Wherein,
Wherein the support is stretchable and contractible to control the inclination of the liquefied storage tank according to an internal liquefied residual load of the liquefied storage tank. 4. The method according to any one of claims 1 to 3,
Wherein,
Wherein the support is expanded and controlled to control the inclination of the liquefied storage tank according to the inclination of the hull.
delete delete 5. The method of claim 4,
Wherein the controller is provided with a residual amount measuring sensor for measuring an internal liquefied residual charge amount of the liquefied storage tank, wherein the controller controls the liquefied storage tank to tilt the liquefied storage tank to one side when the residual load measured from the residual amount measuring sensor is below a certain level Active support of liquefied storage tank to control stretching of support. 6. The method of claim 5,
And a control unit for controlling the expansion and contraction of the support so that the liquefied gas in the liquefied storage tank is horizontally aligned as the inclination information of the hull measured by the attitude measuring sensor, Active support of tank. The method according to claim 1,
In the support,
cylinder; And
And a piston which is inserted into the cylinder at one end and exposed at the other end to be expanded and contracted with respect to the cylinder under the control of the control unit,
Wherein one end of the support is hinged to the liquefied fuel tank and the other end is hinged to the hull.
KR1020140053444A 2014-05-02 2014-05-02 Active Support for Storage Tank for Liquid KR101599299B1 (en)

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Cited By (3)

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KR20210037222A (en) 2019-09-27 2021-04-06 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank
KR20210049451A (en) 2019-10-25 2021-05-06 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank
KR20210157154A (en) 2020-06-19 2021-12-28 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank

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JP6575033B2 (en) * 2017-04-07 2019-09-18 三菱造船株式会社 Ship
KR102251027B1 (en) * 2019-07-24 2021-05-12 (주)태광물탱크 Water tank Support-device with Leveling possible

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KR101259027B1 (en) * 2010-12-10 2013-04-29 삼성중공업 주식회사 Variable accommodation
KR101770830B1 (en) * 2011-06-08 2017-08-23 현대중공업 주식회사 Supporting Structure of Storage Tank
KR101744223B1 (en) 2011-10-18 2017-06-08 현대중공업 주식회사 Supporting System for the Inner Tank of LNG Storage Tank
KR101408346B1 (en) * 2012-05-23 2014-06-17 대우조선해양 주식회사 Antirolling system for a ship

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
KR20210037222A (en) 2019-09-27 2021-04-06 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank
KR20210049451A (en) 2019-10-25 2021-05-06 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank
KR20210157154A (en) 2020-06-19 2021-12-28 삼성중공업 주식회사 Structures for supporting liquefied gas storage tank

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