KR20160011957A - Liquefied Gas Supplying System for Offshore Structure - Google Patents

Liquefied Gas Supplying System for Offshore Structure Download PDF

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Publication number
KR20160011957A
KR20160011957A KR1020140093305A KR20140093305A KR20160011957A KR 20160011957 A KR20160011957 A KR 20160011957A KR 1020140093305 A KR1020140093305 A KR 1020140093305A KR 20140093305 A KR20140093305 A KR 20140093305A KR 20160011957 A KR20160011957 A KR 20160011957A
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KR
South Korea
Prior art keywords
liquefied gas
storage tank
gas storage
heat medium
heat
Prior art date
Application number
KR1020140093305A
Other languages
Korean (ko)
Inventor
이원두
송길달
이도영
정성욱
Original Assignee
삼성중공업 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성중공업 주식회사 filed Critical 삼성중공업 주식회사
Priority to KR1020140093305A priority Critical patent/KR20160011957A/en
Publication of KR20160011957A publication Critical patent/KR20160011957A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
    • B63J2/12—Heating; Cooling
    • B63J2/14—Heating; Cooling of liquid-freight-carrying tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation

Abstract

A liquefied gas supply system for a marine structure is disclosed.
A liquefied gas supply system for a marine structure according to an embodiment of the present invention includes a liquefied gas storage tank for storing liquefied gas; A first heat exchanger installed inside the liquefied gas storage tank; And a first heat medium line connecting the first heat exchanger from the outside of the liquefied gas storage tank and through which the first heat medium is transferred.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas supply system for a marine structure,

The present invention relates to a liquefied gas supply system for a marine structure, and more particularly to a liquefied gas supply system for a marine structure that supplies liquefied gas at a pressure required for an engine of a marine structure such as a ship.

Generally, a marine structure such as a ship drives an engine for navigation at sea. To drive these engines, petroleum products such as bunker c oil are used as fuel. When these petroleum products are used as fuel, regulations on pollutants generated from petroleum products are being tightened. In preparation for such regulations, research is underway to use liquefied natural gas (LNG).

This liquefied natural gas is stored in a storage tank, and the liquefied natural gas stored in the storage tank is supplied to the engine along a supply line. Since liquefied natural gas is an incompressible material in a liquid state, when the liquefied natural gas is stored at about 98% in the storage tank, the pressure rises rapidly according to the amount of heat input from the outside, and when the liquefied natural gas is stored in a small amount in the storage tank, The pressure decreases with the amount of rotor heat input. That is, as the liquefied natural gas is consumed in the storage tank, the pressure in the storage tank is reduced.

When the pressure is reduced, there is a problem that the engine can not be adjusted to the required pressure.

Korean Patent No. 10-0835090

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a liquefied gas supply system for a marine structure that supplies liquefied gas at a pressure required for an engine of a marine structure.

The task of the present application is not limited to the above-mentioned problems, and another task which is not mentioned can be clearly understood by a person skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquefied gas storage tank for storing liquefied gas; A first heat exchanger installed inside the liquefied gas storage tank; And a first heat medium line connecting the first heat exchanger from the outside of the liquefied gas storage tank and through which the first heat medium is transferred.

The apparatus may further include a supply line connecting the engine and the liquefied gas storage tank, wherein the liquefied gas is transferred, and the liquefied gas transferred along the supply line may be an evaporative gas.

In addition, the liquefied gas supply system of the marine structure includes a pressure measuring unit installed in the liquefied gas storage tank and measuring a pressure inside the liquefied gas storage tank; And a pressure adjusting unit installed in the supply line, receiving the measured pressure from the pressure measuring unit, and opening and closing the supply line according to the measured pressure.

The liquefied gas supply system of the marine structure may include a flow rate measuring unit installed in the supply line and measuring a flow rate of the evaporation gas; And a flow rate regulator installed in the first heat medium line for receiving the measured flow rate from the flow rate measuring unit and regulating the flow rate of the first heat medium.

Also, as the amount of the liquefied gas existing in the liquefied gas storage tank decreases, the amount of heat radiated from the first heat exchanger may be reduced.

Also, the first heating medium may be any one of sea water, fresh water, glycol water, and hydrocarbons.

The liquefied gas supply system of the marine structure may include a second heat exchanger installed outside the liquefied gas storage tank and connected to the first heat medium line; And a second heat medium line connected to the second heat exchanger and to which the second heat medium is transferred. When the first heat medium is glycol water or hydrocarbon, the second heat medium may be seawater or fresh water.

In addition, the liquefied gas supply system of the sea structure may further include a vaporizer installed in the supply line.

The liquefied gas supply system of the offshore structure according to the embodiment of the present invention can increase the internal pressure of the liquefied gas storage tank by installing the first heat exchanger in the liquefied gas storage tank.

In addition, since evaporation gas is generated in the liquefied gas storage tank, there is an advantage that a separate vaporizer is not required.

The effects of the embodiments 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 schematic view of a liquefied gas supply system for a marine structure according to an embodiment of the present invention.
Fig. 2 is a view showing a required amount of heat of a liquefied gas storage tank according to a liquefied gas ratio in a liquefied gas storage tank, in a liquefied gas supply system of the sea structure of Fig. 1;
3 is a schematic view of a liquefied gas supply system for a marine structure according to another embodiment of the present invention.
4 is a schematic view of a liquefied gas supply system for a marine structure according to another embodiment of the present invention.
Fig. 5 is a graph showing a required amount of heat of the liquefied gas storage tank according to the liquefied gas ratio in the liquefied gas storage tank, in the liquefied gas supply system of the offshore structure of Fig. 4;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the appended drawings illustrate the present invention in order to more easily explain the present invention, and the scope of the present invention is not limited thereto. You will know.

In describing the embodiments of the present invention, it is to be noted that components having the same function are denoted by the same names and numerals, but are substantially not identical to those of the conventional device.

Also, the terms used in the present application are used only to describe certain embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1 is a schematic view of a liquefied gas supply system for a marine structure according to an embodiment of the present invention. 1, a liquefied gas supply system for a marine structure according to an embodiment of the present invention includes a liquefied gas storage tank 100, a first heat exchanger 210, a first heat medium line 310, and a supply line 400 ).

The liquefied gas storage tank 100 may store the liquefied gas. Here, the liquefied gas may be LNG (Liquefied Natural Gas). The state of the liquefied gas may be a liquid. If the liquefied gas is liquefied natural gas, the liquefied gas storage tank 200 may store the liquefied natural gas at about -160 degrees and 10 bars. The liquefied gas storage tank 100 may also be provided in the sea structure.

The first heat exchanger 210 may be installed inside the liquefied gas storage tank 100. The first heat exchanger 210 may be in contact with the liquefied gas stored in the liquefied gas storage tank 100. The first heat exchanger 210 may receive the first heat medium transferred along the first heat medium line 310, which will be described later. The first heat exchanger 210 may exchange heat between the liquefied gas and the first heat medium. The first heat exchanger 210 may increase the temperature of the interior of the liquefied gas storage tank 100.

The first heat medium line 310 connects the first heat exchanger 210 from the outside of the liquefied gas storage tank 100, and the first heat medium can be transferred.

The first heating medium may be any one of sea water, fresh water, glycol water or hydrocarbon water. The hydrocarbon water may include at least one of ethane, ethylene, propane, and butane.

 The first heating medium line 310 may receive the first heating medium from the first heating medium supplier 311. The first heating medium may be circulated along the first heating medium line 310. In addition, a pump 313 may be installed in the first heating medium line 310. The pump 313 may be a general pump operated at approximately 5 degrees, unlike a pump operated at -160 degrees Celsius.

The supply line 400 connects the engine 150 and the liquefied gas storage tank 100, and the liquefied gas can be transferred. Here, the engine 150 may use the liquefied gas as fuel. The engine 150 may use vaporized liquefied natural gas (LNG) as fuel. The engine 150 is installed in the sea structure, and can provide a driving force or a power to a sea structure such as a ship.

In addition, the liquefied gas transferred along the supply line 400 may be an evaporative gas (BOG). The boil off gas (BOG) is a state in which the liquefied gas is vaporized and can be used directly as fuel for the engine 150. In addition, the supply line 400 may be connected to the upper portion of the liquefied gas storage tank 100. Accordingly, the evaporation gas (BOG) can be smoothly transferred along the supply line (400).

As described above, the liquefied gas supply system for a marine structure according to an embodiment of the present invention can supply heat to the liquefied gas storage tank 100 using the first heat exchanger 210. The pressure of the liquefied gas supplied to the engine 150 from the liquefied gas storage tank 100 is supplied to the engine 150 from the engine 150 so as to prevent the pressure of the liquefied gas storage tank 100 from decreasing. The pressure can be adjusted.

When the liquefied gas stored in the liquefied gas storage tank 100 is consumed to reduce the pressure of the liquefied gas storage tank 100, the liquefied gas stored in the liquefied gas storage tank 100 is discharged through the first heat exchanger 210, So that the pressure of the liquefied gas storage tank 100 can be maintained.

In addition, the liquefied gas supply system of a marine structure according to an embodiment of the present invention may further include a pressure measurement unit 500 and a pressure control unit 510.

The pressure measuring unit 500 is installed in the liquefied gas storage tank 100 and can measure the pressure inside the liquefied gas storage tank 100.

The pressure regulator 510 is installed in the supply line 400 and can receive the measured pressure from the pressure measuring unit 500. The pressure regulator 510 may open / close the supply line 400 according to the measured pressure. That is, the pressure regulator 510 may open the supply line 400 when the measured pressure is greater than the set pressure of the liquefied gas storage tank 100. Accordingly, the pressure of the liquefied gas storage tank 100 can be maintained at the set pressure, and the fuel of the constant pressure can be supplied to the engine 150.

The pressure regulator 510 may be a valve. However, the pressure regulator 510 is not limited to a valve, and may be a variety of devices capable of opening and closing the supply line 400.

In addition, the liquefied gas supply system of the marine structure according to an embodiment of the present invention may further include a flow rate measurement unit 530 and a flow rate control unit 540.

The flow rate measuring unit 530 is installed in the supply line 400 and can measure the flow rate of the evaporation gas.

The flow rate regulator 540 is installed in the first heating medium line 310 and receives the measured flow rate from the flow rate measuring unit 530 to adjust the flow rate of the first heating medium. When the flow rate measured by the flow rate measuring unit 530 is smaller than the flow rate required for the engine 150, the flow rate regulator 540 increases the flow rate of the first heat medium in the first heat medium line 310, Thereby increasing the amount of heat supplied to the liquefied gas storage tank 100. Accordingly, it is possible to increase the flow rate of the evaporation gas transported along the supply line 400.

On the contrary, when the flow rate measured by the flow rate measuring unit 530 is larger than the flow rate required for the engine 150, the flow rate regulator 540 decreases the flow rate of the first heat medium in the first heat medium line 310 Thereby reducing the amount of heat supplied to the liquefied gas storage tank 100.

Fig. 2 is a view showing a required amount of heat of a liquefied gas storage tank according to a liquefied gas ratio in a liquefied gas storage tank, in a liquefied gas supply system of the sea structure of Fig. 1;

First, the liquefied gas storage tank 100 may be a pressurized storage tank to which pressure is applied. In the pressurized storage tank, the amount of evaporation gas generated may be smaller than that of the atmospheric pressure storage tank having a pressure of about 1 atmosphere. Therefore, in order to continuously supply the evaporated gas at the flow rate required for the engine 150, it is necessary to consider the heat flow required according to the ratio of the amount of the liquefied gas to the amount of the evaporated gas in the liquefied gas storage tank 100 .

2 shows that the liquefied gas storage tank 100 has a volume of 7,500 m 3 and the pressure of the liquefied gas storage tank 100 is maintained at 10 bar to supply the engine 150 with 2500 kg / The required heat flow according to the ratio of the amount of liquefied gas to the amount of evaporated gas in the liquefied gas storage tank 100.

2, as the temperature curve of the liquefied gas in the liquefied gas storage tank 100 is examined, as the ratio of the amount of the liquefied gas to the amount of the evaporated gas in the liquefied gas storage tank 100 decreases, In order to keep the internal pressure of the gas storage tank 100 constant, the temperature of the liquefied gas in the liquefied gas storage tank 100 must be increased.

Meanwhile, when the ratio of the amount of liquefied gas to the amount of evaporated gas in the liquefied gas storage tank 100 is decreased, the amount of heat required to vaporize the liquefied gas is summed, so that the required heat flow is reduced.

That is, as the amount of the liquefied gas existing in the liquefied gas storage tank 100 decreases, the amount of heat discharged from the first heat exchanger 210 may be reduced.

Accordingly, unlike a general liquefied gas supply system, the liquefied gas supply system for a marine structure according to an embodiment of the present invention supplies the evaporated gas directly to the engine, thereby eliminating the need for a separate pressurizing device such as a pump or a compressor .

3 is a schematic view of a liquefied gas supply system for a marine structure according to another embodiment of the present invention. The components of the liquefied gas supply system of the marine structure according to another embodiment of the present invention are similar to those described above, so that the second heat exchanger and the second heat medium line will be mainly described.

The second heat exchanger 220 is installed outside the liquefied gas storage tank and may be connected to the first heat medium line 310.

The second heat medium line 320 is connected to the second heat exchanger 220, and the second heat medium can be transferred. Accordingly, in the second heat exchanger 220, the first heat medium and the second heat medium may be heat-exchanged. Further, when the first heating medium is glycol water or hydrocarbon, the second heating medium may be seawater or fresh water.

The liquefied gas supply system of the sea structure according to the present embodiment differs from the liquefied gas supply system in which the liquefied gas and the first heat medium are directly heat-exchanged, after the second heat medium of the glycol water or the hydrocarbon is heat-exchanged with the first heat medium, And indirect heat exchange with the system.

Accordingly, it is possible to prevent the first heat medium from being frozen in the process of heat exchange with the liquefied gas.

4 is a schematic view of a liquefied gas supply system for a marine structure according to another embodiment of the present invention. The components not described in this embodiment are similar to the components of the above-described embodiment, and therefore, a detailed description thereof will be omitted. Referring to FIG. 4, a liquefied gas supply system for a marine structure according to another embodiment of the present invention may further include a vaporizer 410 in the supply line 400.

Unlike the previous embodiments, the liquefied gas delivered along the feed line 400 may be in a liquid state. The vaporizer 410 may vaporize the liquefied gas in the liquefied state. Accordingly, the engine 150 can use the vaporized liquefied gas as fuel.

Fig. 5 is a graph showing a required amount of heat of the liquefied gas storage tank according to the liquefied gas ratio in the liquefied gas storage tank, in the liquefied gas supply system of the offshore structure of Fig. 4; 2 and 5, a liquefied gas supply system for a marine structure according to another embodiment of the present invention differs from the above embodiment in that a liquefied gas in a liquid state, not an evaporation gas, Lt; / RTI > 2 and FIG. 5, it can be seen that the heat flow required in FIG. 2 is larger than the heat flow required in FIG. This is because the liquefied gas supply system of the offshore structure of FIG. 2 supplies the heat flow required for the evaporation gas and directly supplies the evaporation gas to the engine 150. On the contrary, the liquefied gas supply system of the marine structure according to the present embodiment vaporizes the liquefied gas and supplies it to the engine 150.

The liquefied gas storage tank 100 according to the present embodiment differs from the foregoing embodiments in that the amount of the liquefied gas existing in the liquefied gas storage tank 100 decreases in order to maintain a constant pressure, The amount of heat radiated from the first heat exchanger 210 is increased.

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 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: liquefied gas storage tank 150: engine
210: first heat exchanger 220: second heat exchanger
310: first heating medium line 320: second heating medium line
400: supply line 410: vaporizer
500: pressure measuring unit 510: pressure adjusting unit
530: Flow measuring part 540: Flow adjusting part

Claims (8)

A liquefied gas storage tank for storing liquefied gas;
A first heat exchanger installed inside the liquefied gas storage tank; And
A first heat medium line connected to the first heat exchanger from the outside of the liquefied gas storage tank and to which the first heat medium is transferred. The method according to claim 1,
Further comprising a supply line connecting the engine and the liquefied gas storage tank, wherein the liquefied gas is transferred,
Wherein the liquefied gas delivered along the feed line is an evaporative gas. 3. The method of claim 2,
A pressure measuring unit installed in the liquefied gas storage tank and measuring a pressure inside the liquefied gas storage tank; And
And a pressure regulator installed in the supply line for receiving the measured pressure from the pressure measuring unit and opening and closing the supply line according to the measured pressure. 3. The method of claim 2,
A flow rate measuring unit installed in the supply line and measuring a flow rate of the evaporation gas; And
And a flow rate adjusting unit installed in the first heat medium line for receiving a measured flow rate from the flow rate measuring unit and adjusting a flow rate of the first heat medium. 5. The method of claim 4,
And the amount of heat released from the first heat exchanger decreases as the amount of liquefied gas existing in the liquefied gas storage tank decreases. The method according to claim 1,
The first heating medium
A liquefied gas supply system for a marine structure, which is one of sea water, fresh water, glycol water and hydrocarbon water. The method according to claim 6,
A second heat exchanger installed outside the liquefied gas storage tank and connected to the first heat medium line; And
Further comprising a second heat medium line connected to the second heat exchanger and to which the second heat medium is transferred,
And the second heat medium is seawater or fresh water when the first heat medium is glycol water or hydrocarbon water. The method according to claim 1,
Further comprising a vaporizer installed in the supply line.
KR1020140093305A 2014-07-23 2014-07-23 Liquefied Gas Supplying System for Offshore Structure KR20160011957A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
KR1020140093305A KR20160011957A (en) 2014-07-23 2014-07-23 Liquefied Gas Supplying System for Offshore Structure

Publications (1)

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KR20160011957A true KR20160011957A (en) 2016-02-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020009396A1 (en) * 2018-07-02 2020-01-09 주식회사래티스테크놀로지 Fluid tank having internal evaporator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020009396A1 (en) * 2018-07-02 2020-01-09 주식회사래티스테크놀로지 Fluid tank having internal evaporator
JP2021529293A (en) * 2018-07-02 2021-10-28 ラティステクノロジー カンパニー リミテッド Fluid tank with internal evaporator

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