KR20150142754A - Vessel for supplying liquefied fuel gas - Google Patents

Abstract

A vessel to supply liquefied fuel gas is disclosed. The vessel to supply liquefied fuel gas according to an embodiment of the present invention, which supplies liquefied fuel gas to a fuel tank of a liquefied fuel gas propulsion ship, comprises: a storage tank which includes a low-pressure storage tank to receive liquefied fuel gas in a relatively low-pressure state, and a high-pressure storage tank to receive liquefied fuel gas in a relatively high-pressure state; a fuel gas fueling line which is connected to the high-pressure storage tank to supply the liquefied fuel gas to the liquefied fuel gas propulsion ship; and a fuel gas supply line which supplies the liquefied fuel gas received in the low-pressure storage tank to the high-pressure storage tank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a liquefied fuel gas refueling line, and more particularly, to a liquefied fuel gas refueling line capable of efficiently refining and treating a liquefied fuel gas and an evaporating gas.

As IMO regulations on the emission of greenhouse gases and various air pollutants are strengthened, shipbuilding and marine industries are replacing the use of conventional oil and diesel oil with natural gas, which is a clean energy source, There are a lot of cases in which they are used.

In general, natural gas is stored in a fuel tank or a storage tank of a ship in the state of liquefied natural gas (LNG) which is cooled and liquefied at a cryogenic temperature of about -163 degrees Celsius, To a remote location.

Such liquefied natural gas can be understood as a kind of liquefied fuel gas. When liquefied fuel gas is used as fuel for a ship or when it is intended to be charged in a tank for transportation, There are not many ports equipped with fuel gas storage facilities, and currently existing liquefied fuel gas storage facilities are largely separated from the port where general commercial vessels such as container ships are anchored due to safety reasons. For this reason, a ship using a liquefied fuel gas such as liquefied natural gas as a fuel has to be moved to a liquefied fuel gas storage facility remote from the port and supplied with liquefied fuel gas in order to supply liquefied fuel gas.

However, operating and anchoring vessels from liquefied fuel gas storage facilities far from the port to liquefied fuel gas liquefaction has been problematic in that unnecessary labor and time are consumed and additional costs are incurred.

Therefore, the liquefied fuel gas refueling line, which is stored in the storage tank in the floating state in the liquefied fuel gas propulsion vessel, approaches the liquefied fuel gas propulsion vessel, and the liquefied fuel gas Is being used.

However, when the liquefied fuel gas is stored in the storage tank of the liquefied fuel gas refueling line at a low pressure, there is a problem that the internal pressure of the storage tank rises due to a large amount of boil-off gas (BOG) There is a problem that the high performance of the storage tank is required when the liquefied fuel gas is received in a high pressure state, and the facility production cost is expensive.

In addition, in the fuel tank of the liquefied fuel gas propulsion vessel, the evaporation gas is excessively generated in the process of supplying the liquefied fuel gas from the liquefied fuel gas refueling line, the internal pressure of the fuel tank rises, There was a problem that it could not be done.

Therefore, there is a need for research on efficiently accommodating the liquefied fuel gas in the storage tank of the liquefied fuel gas refueling line and efficiently treating the evaporated gas in the fuel tank of the liquefied fuel gas propulsion vessel.

Korean Published Patent Application No. 10-2012-0075941 (published on 07., 09., 2012)

An embodiment of the present invention is to provide a liquefied fuel gas refueling line capable of efficiently accommodating and storing liquefied fuel gas in a storage tank of a liquefied fuel gas refueling line.

An embodiment of the present invention is to provide a liquefied fuel gas refueling line capable of efficiently processing evaporative gas existing in a storage tank of a liquefied fuel gas refueling line and a fuel tank of a liquefied fuel gas propelling vessel.

An embodiment of the present invention is to provide a liquefied fuel gas refueling line capable of smoothly performing a lubrication operation.

An embodiment of the present invention is to provide a liquefied fuel gas refueling line capable of efficient facility operation.

According to an aspect of the present invention, there is provided a liquefied fuel gas refueling line for supplying a liquefied fuel gas to a fuel tank of a liquefied fuel gas propulsion vessel, comprising: a low-pressure storage tank for storing a liquefied fuel gas in a relatively low- Pressure storage tank, a fuel gas supply line connected to the high-pressure storage tank for supplying the liquefied fuel gas to the liquefied fuel gas propulsion vessel, and a liquefied fuel stored in the low-pressure storage tank, And a fuel gas supply line for supplying gas to the high-pressure storage tank.

And an evaporative gas recovery line for supplying evaporative gas generated in the fuel tank of the liquefied fuel gas propulsion vessel to the high-pressure storage tank.

And an evaporative gas processing line for recovering evaporative gas generated in the low-pressure storage tank to the high-pressure storage tank.

The evaporation gas recovery line may be provided with a compression facility for compressing the evaporation gas generated in the fuel tank and supplying the compressed gas to the high pressure storage tank.

The compression device may be provided with a low pressure compression device for compressing the evaporation gas to a relatively low pressure and a high pressure compression device for compressing the evaporation gas to a relatively high pressure.

The evaporation gas processing line may be provided with a compressor for compressing the evaporation gas generated in the low pressure storage tank and supplying the compressed gas to the high pressure storage tank.

And an evaporated gas consumption line connected to the high-pressure storage tank for supplying the evaporated gas contained in the high-pressure storage tank to the fuel of the power generation facility of the liquefied fuel gas refueling line.

The low pressure storage tank may receive an internal pressure of 1 bar and the high pressure storage tank may be provided to receive an internal pressure of 5 bar to 20 bar.

The liquefied fuel gas refueling line according to the embodiment of the present invention has the effect of efficiently accommodating and storing the liquefied fuel gas in the storage tank.

The liquefied fuel gas refueling line according to the embodiment of the present invention has the effect of safely and effectively treating the evaporation gas present in the storage tank of the liquefied fuel gas refueling line and the fuel tank of the liquefied fuel gas propelling vessel.

The liquefied fuel gas refueling line according to the embodiment of the present invention has an effect of enabling efficient facility operation.

The liquefied fuel gas refueling line according to the embodiment of the present invention has the effect of smoothly performing the lubrication operation.

1 is a view showing a liquefied fuel gas refueling line and a liquefied fuel gas propelling vessel according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a configuration diagram showing a liquefied fuel gas propulsion vessel 100 and a liquefied fuel gas propulsion vessel 200 according to an embodiment of the present invention.

1, a liquefied fuel gas refueling line 100 according to an embodiment of the present invention includes a low-pressure storage tank 120 and a high-pressure storage tank 110, which are provided in a liquefied fuel gas refueling line 100 and accommodate liquefied fuel gas, A fuel gas supply line 130 connected to the liquefied fuel gas propulsion vessel 200 for supplying the liquefied fuel gas to the liquefied fuel gas propulsion vessel 200 and a liquefied fuel gas supply line 130 for connecting the liquefied fuel gas stored in the low pressure storage tank 120 to the high pressure An evaporative gas recovery line 140 for recovering evaporative gas inside the fuel tank 210 of the liquefied fuel gas propulsion vessel 200, a low-pressure storage tank 120 The evaporation gas processing line 160 for supplying the evaporation gas in the high pressure storage tank 110 and the evaporation gas in the high pressure storage tank 110 to the various power generation facilities 180 of the liquefied fuel gas refueling line 100 The evaporation gas consumption line 170 may be provided.

In this embodiment, the liquefied fuel gas may be any one of LNG and LPG DME (Dimethylether) that can be stored in a liquefied state, but is not limited thereto. Hereinafter, the liquefied fuel gas is LNG as an example for the sake of convenience.

The liquefied fuel gas supply line 100 supplies liquefied fuel gas to the low-pressure storage tank 120 or the high-pressure storage tank 110 from the liquefied fuel gas storage facility. Liquefied fuel gas storage facilities may be floating storage facilities, marine carriers or land terminals.

The liquefied fuel gas propulsion vessel 200 receives the liquefied fuel gas from the liquefied fuel gas refueling vessel 100 and uses the liquefied fuel gas as the fuel of the propulsion engine of the ship or supplies the liquefied fuel gas to the fuel tank 210 for transferring the liquefied fuel gas And it is not limited to any one type as long as it is a ship which receives the liquefied fuel gas from the liquefied fuel gas refueling line 100.

The storage tank is provided in the liquefied fuel gas supply line 100 and includes a low-pressure storage tank 120 and a high-pressure storage tank 110. The low pressure storage tank 120 is a storage tank that stores or receives the liquefied fuel gas at a relatively low pressure, for example, its internal pressure can be accommodated at about 1 bar. The high-pressure storage tank 110 is a storage tank for storing or containing the liquefied fuel gas at a relatively high pressure, for example, its internal pressure can be accommodated in a range of about 5 to 20 bar.

The liquefied fuel gas is divided into a low-pressure storage tank 120 and a high-pressure storage tank 110. The liquefied fuel gas in the low-pressure storage tank 120 passes through the fuel gas supply line 150, which will be described later, The liquefied fuel gas in the high-pressure storage tank 110 is supplied to the fuel tank 210 of the liquefied fuel gas propelling vessel 200 through the fuel gas refueling line 130, which will be described later, during the refueling operation of the liquefied fuel gas. .

The storage of the liquefied fuel gas into the low-pressure storage tank 120 and the high-pressure storage tank 110 maximizes the advantage that the liquefied fuel gas is generated when the liquefied fuel gas is received in the low-pressure state and the high-pressure state, .

In particular, when the liquefied fuel gas is received in the low-pressure storage tank 120, since the low-pressure storage tank 120 can withstand a low internal pressure, high performance is not required and the cost of the facility can be relatively reduced. However, The amount of evaporation gas generated is increased. On the contrary, when the liquefied fuel gas is received in the high-pressure storage tank 110, the internal pressure is relatively high, so that the amount of generated evaporation gas can be reduced. However, since it is required to withstand a high internal pressure, high performance is required, There is a problem that the equipment cost of the equipment is increased.

Accordingly, the storage tank according to the embodiment of the present invention simultaneously accommodates the liquefied fuel gas in the high-pressure storage tank 110 and the low-pressure storage tank 120 to improve the efficiency and cost of the storage tank facility, Can be effectively treated through the evaporation gas processing line 160 to be described later.

The fuel gas refueling line 130 is provided to connect the inside of the high pressure storage tank 110 of the liquefied fuel gas refueling line 100 and the inside of the fuel tank 210 of the liquefied fuel gas propelling vessel 200. Since the fuel gas refueling line 130 generally supplies the liquefied fuel gas, the inlet side end may be connected to the lower side of the inside of the high-pressure storage tank 110, and the outlet side end may be connected to the lower side of the inside of the fuel tank 210. A supply pump 131 may be provided to smoothly supply the liquefied fuel gas to the inlet of the fuel gas refueling line 130 on the side of the high-pressure storage tank 110.

The fuel gas refueling line 130 is connected to the high-pressure storage tank 110 to refuel the liquefied fuel gas stored in the high-pressure storage tank 110 because the higher the internal pressure of the storage tank is, the more smoothly the lubrication operation can be performed to be.

The fuel gas refueling line 130 can facilitate the installation, connection or separation of the fuel gas refueling line 130 when the liquefied fuel gas refueling line 100 and the liquefied fuel gas propelling vessel 200 are docked or undocked for lubrication. The fuel gas refueling line 130 is divided into the liquefied fuel gas refueling vessel 100 and the liquefied fuel gas propelling vessel 200 so that the fuel gas refueling line 130 and the liquefied fuel gas propelling vessel 200 can be performed. Mediated.

The fuel gas supply line 150 is provided to connect the interior of the low-pressure storage tank 120 and the interior of the high-pressure storage tank 110 of the liquefied fuel gas refueling line 100. Since the fuel gas supply line 150 generally supplies the liquefied fuel gas, the inlet side end may be connected to the lower side inside the low-pressure storage tank 120, and the outlet side end may be connected to the lower side of the inside of the fuel tank 210. A supply pump 151 may be provided at the inlet of the fuel gas supply line 150 on the side of the low-pressure storage tank 120 so as to smoothly supply the liquefied fuel gas to the fuel gas supply line 130.

The fuel gas supply line 150 supplies the liquefied fuel gas stored in the low-pressure storage tank 120 at a relatively low pressure to the high-pressure storage tank 110 so that the lubrication operation is performed through the fuel gas supply line 130. In other words, the liquefied fuel gas in the low-pressure storage tank 120 is supplied to the high-pressure storage tank 110 having a relatively higher internal pressure so that the lubrication can be smoothly performed.

Although not shown in the drawing, the fuel gas supply line 150 may be provided with a valve for regulating opening and closing. This prevents the liquefied fuel gas from flowing back to the low-pressure storage tank 120 through the fuel gas supply line 150 during the lubrication operation through the fuel gas lubrication line 130 and prevents the liquefied fuel gas from flowing back to the high-pressure storage tank 110 ) Internal pressure can be maintained or smoothly raised.

On the other hand, when the liquefied fuel gas is LNG, the liquefaction temperature of the LNG is a very low temperature of -163 degrees Celsius, and evaporation occurs even if the temperature of the LNG is slightly increased. The low pressure storage tank 120 and the high pressure storage tank 110 of the liquefied fuel gas refueling line 100 and the fuel tank 210 of the liquefied fuel gas propelling vessel 200 are subjected to the heat insulation treatment and the temperature rise of the LNG However, since it is impossible to realize complete heat shielding, external heat is continuously transferred to the LNG, and vaporization such as LNG evaporation occurs, thereby generating a boil-off gas (BOG).

This evaporated gas is generated when the internal pressure of the storage tank containing the liquefied fuel gas is low, and particularly, when the liquefied fuel gas is supplied from the fuel tank 210 of the liquefied fuel gas propulsion vessel 200, The amount of evaporation gas is very large.

The evaporation gas excessively raises the pressure inside the fuel tank 210 of the liquefied fuel gas propulsion vessel 200 and may interfere with the lubrication operation of the liquefied fuel gas and the internal pressure of the storage tank or the fuel tank 210 There is a risk that the tank is continuously elevated to deform or damage the tank, and furthermore, there is a risk of explosion. Therefore, there is a need to remove or treat the evaporation gas.

The evaporation gas recovery line 140 is connected to the inside of the fuel tank 210 of the liquefied fuel gas propulsion vessel 200 and has an outlet side end connected to the inside of the high pressure storage tank 110 of the liquefied fuel gas refueling line 100 Lt; / RTI > Compressors 141 and 142 are provided in the evaporative gas recovery line 140 to recover the evaporative gas generated in the fuel tank 210 and to compress the recovered evaporative gas to generate high- (110).

The compression devices 141 and 142 are provided on the downstream side of the low pressure compression device 141 for compressing the evaporation gas that has passed through the low pressure compression device 141 to a relatively high pressure And a high pressure compression device 142. The low pressure compressor 141 can compress the evaporation gas to a pressure of about 5 bar at a pressure of about 1 bar and the high pressure compressor 142 can compress the evaporated gas at a pressure of about 5 bar to about 10 to 20 bar to the high pressure.

When the liquefied fuel gas refueling line 100 lubs the liquefied fuel gas to the liquefied fuel gas propulsion vessel 200, the fuel tank 210 of the liquefied fuel gas propelling vessel 200 generates a large amount of evaporated gas as described above It is necessary to raise the internal pressure of the high-pressure storage tank 110 of the liquefied fuel gas refueling line 100 so that the lubrication operation can be smoothly performed.

The evaporation gas recovery line 140 compresses the evaporative gas present in the fuel tank 210 of the liquefied fuel gas propulsion vessel 200 through the low pressure compression device 141 and the high pressure compression device 142, Pressure storage tank 110 of the high-pressure storage tank 110, so that the internal pressure of the high-pressure storage tank 110 can be increased to enable a smooth lubrication operation.

The evaporation gas recovery line 140 can be easily installed, connected or separated when the liquefied fuel gas refueling line 100 and the liquefied fuel gas propelling vessel 200 are docked or undocked for lubrication operation The evaporating gas recovery line 140 is divided into the liquefied fuel gas refueling vessel 100 and the liquefied fuel gas propelling vessel 200 so that the liquefied fuel gas refueling vessel 100 and the liquefied fuel gas propelling vessel 200 can be operated. Mediated.

The evaporation gas processing line 160 has an inlet end connected to the inside of the low pressure storage tank 120 of the liquefied fuel gas supply line 100 and an outlet end connected to the inside of the high pressure storage tank 110. The evaporation gas processing line 160 may include a compressor 161 to compress and supply the evaporation gas present in the low pressure storage tank 120 to the high pressure storage tank 110 side. The evaporation gas processing line 160 recovers the evaporation gas generated in the low pressure storage tank 120 to the high pressure storage tank 110 side to prevent the internal pressure of the low pressure storage tank 120 from rising excessively, The excess evaporation gas is used as the internal pressure raising source of the high-pressure storage tank 110 like the gas recovery line 140.

Although not shown in the drawings, when the evaporation gas flows into the high-pressure storage tank 110 through the lubrication operation or the evaporation gas recovery line 140, the evaporation gas is supplied to the low-pressure storage tank 120 through the evaporation gas processing line 160 A valve that can be opened and closed can be provided to prevent backflow.

The evaporation gas consumption line 170 is connected to the high pressure storage tank 110 to supply the evaporation gas in the high pressure storage tank 110 to the power generation facility 180 which is an energy consumption source such as a propulsion engine of the liquefied fuel gas refueling line 100 . It is unnecessary to supply the unnecessary low-pressure gas generated in the fuel tank 210 of the liquefied-fuel gas propelling vessel 200 and the low-pressure storage tank 120 of the liquefied fuel gas refueling vessel 100 through the evaporation gas recovery line 140 and the evaporation gas processing line 160 It is possible to effectively utilize an energy source that is recovered by supplying the evaporative gas to the fuel of the power generation facility 180 of the liquefied fuel gas refueling line 100 through the evaporation gas consumption line 170 and effectively utilize the facility operation efficiency can do. The evaporation gas consumption line 170 is provided with a compressor (not shown) to compress and supply the evaporation gas to the evaporation gas pressure demanded by the generator as fuel.

Although not shown in the drawing, the liquefied fuel gas refueling line 100 is provided with a ship control system and includes a fuel gas refueling line 130, an evaporation gas recovery line 140, an evaporation gas treatment line 160, 170 and the opening and closing operation of the valve.

The liquefied fuel gas refueling line 100 according to the embodiment of the present invention having such a configuration divides the liquefied fuel gas into the low-pressure storage tank 120 and the high-pressure storage tank 110, The facility operation efficiency can be improved.

The evaporation gas generated in the fuel tank 210 of the liquefied fuel gas propulsion vessel 200 is compressed through the evaporation gas recovery line 140 in two stages and supplied to the high pressure storage tank 110. The low pressure storage tank 120 Pressure storage tank 110 so that the internal pressure of the high-pressure storage tank 110 can be easily increased to smoothly perform the lubrication operation .

In addition, since the evaporation gas contained in the high-pressure storage tank 110 is supplied to the fuel in the power generation facility 180 of the liquefied fuel gas refueling line 100 through the evaporation gas consumption line 170, unnecessary evaporation gas is used as an energy source It has the effect of improving the energy efficiency and promoting the safe operation of the ship.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

100: liquefied fuel gas supply line 110: high pressure storage tank
120: low pressure storage tank 130: fuel gas refueling line
140: Evaporative gas recovery line 150: Fuel gas supply line
160: Evaporative gas treatment line 170: Evaporative gas consumption line
180: Power generation facility 190: Cryogenic connector
200: liquefied fuel gas propulsion vessel 210: fuel tank

Claims (8)

A liquefied fuel gas refueling line for supplying liquefied fuel gas to a fuel tank of a liquefied fuel gas propulsion vessel,
A storage tank including a low-pressure storage tank for storing the liquefied fuel gas at a relatively low pressure and a high-pressure storage tank for storing the liquefied fuel gas at a relatively high pressure;
A fuel gas refueling line connected to the high-pressure storage tank for supplying liquefied fuel gas to the liquefied fuel gas propulsion vessel; And
And a fuel gas supply line for supplying the liquefied fuel gas stored in the low-pressure storage tank to the high-pressure storage tank. The method according to claim 1,
Further comprising: an evaporative gas recovery line for supplying evaporated gas generated in a fuel tank of said liquefied fuel gas propulsion vessel to said high pressure storage tank. 3. The method according to claim 1 or 2,
Pressure storage tank, and an evaporative gas processing line for recovering the evaporated gas generated in the low-pressure storage tank to the high-pressure storage tank. 3. The method of claim 2,
The evaporation gas recovery line
And a compression unit for compressing the evaporated gas generated in the fuel tank and supplying the compressed gas to the high-pressure storage tank. 5. The method of claim 4,
The compression device
A low pressure compression device for compressing the evaporation gas at a relatively low pressure,
A liquefied fuel gas refueling line comprising a high pressure compression device for compressing the evaporation gas to a relatively high pressure. 5. The method of claim 4,
The evaporation gas processing line
Pressure storage tank, and a compressor for compressing the evaporated gas generated in the low-pressure storage tank and supplying the compressed gas to the high-pressure storage tank. The method according to claim 1,
Further comprising an evaporated gas consumption line connected to the high pressure storage tank for supplying evaporated gas stored in the high pressure storage tank to the fuel of the power generation facility of the liquefied fuel gas refueling line. The method according to claim 1,
Wherein the low pressure storage tank receives an internal pressure of 1 bar and the high pressure storage tank receives an internal pressure of 5 bar to 20 bar.

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