KR20140062226A - Bog treating system using expending energy of gas fuel - Google Patents

Abstract

The present invention relates to a treating system for boil off gas using the expansion energy of gas, comprising: a liquefied gas storage tank in which liquefied gas is accommodated; a liquefied gas supply line which transfers the gas from the liquefied gas storage tank; a boil off gas supply line which transfers a first BOG generated by being connected to the liquefied gas storage tank; a vaporization unit which increases the pressure of the gas transferred from the liquefied gas storage tank and evaporates the gas by being connected to the liquefied gas supply line; a vaporized gas supply line which transfers the vaporized gas to a destination location by being connected to the vaporization unit; and a pressure control unit which is connected to the vaporized gas supply line and the boil gas off supply line, reduces the pressure of the gas passing through the vaporized gas supply line and increases the pressure of the first BOG passing through the boil off gas supply line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an evaporation gas processing system using an expansion energy of a gas,

The present invention relates to an evaporative gas processing system, and more particularly, to an evaporative gas processing system that connects an expander for decompressing a gas and a compressor for compressing an evaporative gas to generate an evaporative gas Processing system.

Liquefied gas consumption such as LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas) is rapidly increasing worldwide. The liquefied gas is transported in a gaseous state via land or sea gas piping, or in a liquefied state and stored in a liquefied gas carrier and transported to a distant consumer.

LNG and LPG are obtained by cooling natural gas or petroleum gas at cryogenic temperature, and they are generally used in a liquid state when they are transported at a long distance because the volume thereof is greatly reduced as compared with the gas state.

Examples of maritime structures provided with storage tanks capable of storing liquefied gas at cryogenic temperatures include structures such as LNG regasification vessels and offshore platforms in addition to liquefied gas carriers.

In a storage tank for storing liquefied gas at such a cryogenic temperature, a boiled off gas (BOG) is inevitably generated, and various devices have been developed to treat the liquefied gas. Particularly, there have been many methods of using liquefaction facilities and burning after discharging to the atmosphere. However, there has been a problem that energy waste is serious and greenhouse gas which pollutes the atmosphere due to emission of CO2 and CH4 is increased.

An apparatus for re-liquefying the evaporation gas that has been developed in the past is an apparatus and a method for maintaining the performance of the cooling system for the evaporation gas re-liquefying apparatus of Korean Patent Laid-Open No. 10-2010-0049728.

The present invention relates to an evaporative gas treatment system, and more particularly, to an evaporative gas treatment system that includes a gas supplying unit that mixes a gas and an evaporation gas by compressing the evaporation gas together by using power generated when a high- And an evaporation gas processing system using the expansion energy of the evaporation gas.

According to an aspect of the present invention, there is provided an evaporative gas processing system including a liquefied gas storage tank containing a gas in a liquid state, a liquid supply line for transferring the gas from the liquefied storage tank, A vaporized gas supply line connected to the liquefied gas supply line for transferring a first BOG (Boiled Off Gas) generated in connection with the liquid storage tank, a vaporization unit for increasing the pressure of the gas transferred from the liquid storage tank, A gaseous supply line connected to the vaporization unit and transferring the vaporized gas to a target position; And a gas supply line connected to the gas supply line and the evaporation gas supply line for reducing the pressure of the gas passing through the gas supply line and for increasing the pressure of the first BOG passing through the vapor gas supply line And a control unit.

The pressure regulating unit may include an inflator connected to the gas-oil supply line to reduce the pressure of the gas, and a controller connected to the inflator and connected to the evaporation gas supply line, And a compressor for increasing the pressure of the supplied first BOG.

The compressor may include a plurality of compressors to compress the first BOG supplied from the evaporation gas supply line stepwise.

The apparatus may further include a buffer tank disposed between the liquefied storage tank and the vaporization unit on the liquid supply line for receiving the liquid gas transferred to the vaporization unit and transferred to the vaporization unit.

Here, the compressor includes at least one main compression means for boosting the pressure of the first BOG supplied through the evaporation gas supply line, and at least one auxiliary compression means connected to the main compression means for further boosting the first BOG And auxiliary compression means, each of which can be serially connected in series to stepwise compress the first BOG.

A first auxiliary supply line connected to the buffer tank and supplying a second BOG generated in the buffer tank to the auxiliary compression means and a second auxiliary supply line connected to the main compression means and the buffer tank, And a second auxiliary supply line for selectively supplying a portion of the boosted first BOG.

The pressure regulating unit may further include a generator that generates electric power by using the power generated by the expansion of the inflator.

The apparatus may further include a mixing unit that is provided on the gas-oil supply line and is connected to the evaporation gas supply line and supplies the gas and the first BOG, which is pressurized by the pressure regulating unit, .

The apparatus may further include a heating unit provided on the gas supply line and for heating the gas whose pressure has been reduced by the pressure regulating unit.

A bypass line connected to the gas supply line and selectively bypassing the gas in a gaseous state so as not to pass through the pressure regulating unit and a pressure reducer for lowering the pressure of the gas disposed on the bypass line; And an auxiliary decompression unit including the auxiliary decompression unit.

The evaporative gas processing system using the expansion energy of the gas according to the present invention has the following effects.

The operation of the compressor by using the power generated by the expansion of the inflator which reduces the increased pressure of the gas during the vaporization of the liquid state gas enables the evaporation gas generated from the liquid storage tank BOG) can be compressed and mixed with the gas to be supplied to the target position.

Further, since a plurality of compressors are connected in series, there is an effect that the compression efficiency can be increased by compressing the evaporation gas in multiple stages at the time of compression.

1 is a view showing a configuration of an evaporative gas processing system using expansion energy of a gas according to an embodiment of the present invention;
FIG. 2 is a view showing a state where a plurality of compressors are arranged in an evaporative gas processing system using the expansion energy of the gas of FIG. 1; FIG.
FIG. 3 is a diagram showing a configuration in which a separate generator is further provided in the evaporative gas processing system using the expansion energy of the gas of FIG. 1; FIG. And
FIG. 4 is a view showing a configuration in which an auxiliary decompression unit is further provided in the evaporative gas processing system using the gas expansion energy of FIG. 1;

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.

Although the gas has been described in the description of the present embodiment, not only gas but also various gases can be applied.

First, referring to FIG. 1, a schematic configuration of an evaporative gas processing system using gas expansion energy according to an embodiment of the present invention will be described.

1 is a view showing a configuration of an evaporative gas processing system using expansion energy of a gas according to an embodiment of the present invention.

As shown in the drawing, the evaporative gas processing system using the expansion energy of the gas according to the embodiment of the present invention mainly includes a liquefied storage tank 100, a liquid-supply supply line L1, a gas-liquid supply line L2, And includes a line L3, a vaporization unit 200, a pressure regulation unit 300, a mixing unit 500, a buffer tank 400 and a heating unit 600. [

The liquefied gas storage tank 100 is a tank capable of receiving the gas G1. In this embodiment, the liquefied gas (LNG) is contained therein and maintained at an internal temperature below the vaporization point so as not to vaporize, .

Here, the liquefied storage tank 100 stores a large amount of the gas G1 in a liquid state, and selectively supplies the gas G1 to a target position to be used.

The liquefied gas supply line L1 has a general tubular shape and supplies the gas in the liquid state stored in the liquid storage tank 100 to the outside as shown in the figure.

The evaporation gas supply line L3 is connected to the liquefied storage tank 100 to transfer a first BOG (G2: Boiled off gas). The evaporation gas supply line L3 is configured similarly to the liquid supply line L1 and supplies the first BOG G2 generated in the liquid storage tank 100 to the target position.

The vaporization unit 200 is connected to the liquid supply line L1 to pressurize and heat the gas G1 to be transferred in a liquid state, thereby causing a phase change to a gaseous state.

The vaporization unit 200 includes a pressurization pump 210 and a heating unit 220. The pressurization pump 210 pressurizes the gas G1 supplied from the liquefied storage tank 100 By increasing the pressure, the gas G1 is brought into a supercritical state.

Here, the supercritical state refers to a fluid at a point where a state exceeding a certain high pressure limit is reached and the liquid and the gas can not be distinguished from each other. The density of the molecules is close to the liquid, but the viscosity is low and has a property close to the gas. In addition, since the diffusion is rapid and the thermal conductivity is high, the gas fired furnace can be vaporized with a small amount of heat.

The heating unit 220 is a device for transferring heat to the gas G1 pressurized by the pressurizing pump 210 to vaporize the gas G1. A general heater may be used. In this embodiment, the vaporization unit 200 is heated And the gas G1 is vaporized through heat exchange using the seawater.

Generally, since the gas G1 has a very low vaporization point, the gas G1 has a higher temperature for storing the liquid in the liquid storage tank 100. Therefore, a large amount of energy is required to vaporize the gas G1. However, when the gas G1 is in the supercritical state, the energy required for vaporization becomes relatively small.

Therefore, the gasification unit 200 converts the gas G1 into a supercritical state by transferring heat through the heating unit 220 by using the pressurization pump 210, Vaporize.

That is, the gas G1 received in the liquefied storage tank 100 enters the high-pressure gas state via the vaporization unit 200.

The gas-oil supply line (L2) is connected to the vaporization unit (200) to transfer the vaporized gas (G1) to the target position. Here, the gas-oil supply line L2 may have the same material and shape as the liquid-supply line L1, and the gas G1 may move in a gas state. Since the vaporized gas G1 is in a high-pressure state, the gas-oil supply line L2 must have durability not to be damaged by a high-pressure gas.

The pressure regulating unit 300 is connected to the gas supply line L2 and is disposed on the movement path of the gas G1 to reduce the pressure of the vaporized gas G1, (G3) that is connected to the first BOG (L3). That is, the pressure regulating unit 300 lowers the pressure of the gas G1 in the gaseous state moving along the gas-oil supply line L2, and at the same time, 1 Increase the pressure of BOG (G2).

The pressure regulating unit 300 includes an expansion unit 310 and a compressor 320. The expansion unit 310 is connected to the gas supply line L2 To reduce the pressure of the gas G1 to be transferred. In the present embodiment, the inflator 310 inflates the gas G1 vaporized via the vaporization unit 200 to a pressure required at the target position to lower the pressure.

The compressor 320 is connected to the inflator 310 and is connected to the evaporation gas supply line L3 to compress the first BOG G2 to increase the pressure.

Here, the compressor 320 compresses the first BOG (G2) moving using the expanding power to lower the pressure of the gas (G1) in the inflator (310). That is, the compressor 320 is connected to the inflator 310, and the inflating expanding force of the inflator 310 is a compression force that is compressed by the compressor 320 as it is. Of course, the inflator 310 and the compressor 320 may be integrally formed. Even if the inflator 310 and the compressor 320 are separately configured, the compressor 320 may compress the first BOG (G2) by using the inflating force of the inflator 310 Any configuration can be applied if it can be compressed.

The mixing unit 500 is provided on the gas-oil supply line L2 and is connected to the evaporation gas supply line L3 and is connected to the gas G1 decompressed through the pressure regulating unit 300, And the first BOG (G2) is supplied and mixed.

That is, the mixing unit 500 mixes the gas G1 supplied from each of the gas-oil supply line L2 and the evaporation gas supply line L3 with the first BOG G2, . Since the pressure of the gas G1 supplied from the liquefied storage tank 100 and the generated pressure of the first BOG G2 are different from each other, And mixed by the mixing unit 500 in a state in which the respective pressure deviations are reduced.

Although the gas G1 and the first BOG G2 can be mixed with each other without the mixing unit 500, the gas G1 having the pressure controlled by the pressure regulating unit 300 ) And the first BOG (G2) are different from each other.

Particularly, since the temperature of the first BOG (G2) pressurized by the compressor 320 greatly increases, when the temperature difference between the gas G1 and the first BOG (G2) is large, .

In order to solve such a problem, a separate mixing unit 500 is provided so that the gas G1 via the pressure regulating unit 300 and the first BOG G2 are mixed well.

The compressor 320 and the inflator 310 are each configured to minimize the relative pressure difference by regulating the pressure of the gas G1 and the first BOG G2 to be transferred, , The gas (G1) and the first BOG (G2) are mixed.

The buffer tank 400 is configured to receive the gas G1 therein and is disposed on the liquefied gas supply line L1 so that the gas G1 contained in the liquefied storage tank 100 A part of the gas G1 is received at a relatively higher pressure than the liquid storage tank 100 so that the gas G1 can be stably supplied to the target position.

At this time, the buffer tank 400 is configured to receive the gas G1 in a liquid state and maintain a relatively higher pressure than the liquefied storage tank 100 so that the liquid state can be maintained even when the temperature changes.

Since the gas G1 is largely influenced by the temperature, a system for vaporizing and supplying the gas G1 generally includes a separate buffer tank 400 so that the gas G1 from the large capacity liquefied storage tank 100 (G1) for a limited period of time and then delivers the gas to the vaporization unit 200. [

Although it is possible to directly transfer the gas G1 from the liquid storage tank 100 to the vaporization unit 200 in order to stably supply the gas G1 sensitive to the surrounding environment, .

The heating unit 600 is disposed on the gas supply line L2 as shown and heats the gas G1 which is decompressed by the inflator 310. [ The gas (G1) vaporized by the inflator (310) passes through the inflator (310) and is depressurized. In this process, the pressure of the gas G1 is decreased and the temperature is lowered.

Therefore, the heating unit 600 is disposed on the conveyance path of the gas G1 and is adapted to be supplied to the target position by raising the temperature of the gas G1 depressurized by the pressure regulating unit 300 .

Here, the heating unit 600 may be a general heating device, and in the present embodiment, a heat exchanger using heated seawater is used.

The gas G1 is supplied from the liquefied storage tank 100 to the buffer tank 400 through the liquefied gas supply line L1 . Here, the pressure of the liquefied storage tank 100 is, for example, about 1 bara, and the gas G1 is maintained at a cryogenic temperature so that the gas can be maintained in a liquid state. The buffer tank 400 maintains the pressure of about 5 bara, which is relatively higher than that of the liquefied storage tank 100, so that the received gas G1 can maintain a liquid state.

Thus, the gas G1 received in the buffer tank 400 is moved to the vaporization unit 200 along the liquid supply line L1 and is vaporized. Here, the gas G1 is pressurized by the pressurizing pump 210 at a high pressure of, for example, about 150 bara, thereby becoming a supercritical state. The temperature is raised by the heating unit 220 and is vaporized. That is, the temperature of the gas G1 is raised by the vaporization unit 200 to become a gaseous state and become a high-pressure state.

The gas G1 vaporized by the vaporization unit 200 is depressurized by the pressure regulating unit 300 to be suitable for the pressure required at the target position. The gas G1 is decompressed by the inflator 310 so that the inflator 310 is decompressed and the power is generated by expansion of the gas G1.

Meanwhile, the first BOG (G2) generated in the liquefied storage tank 100 is transferred to the pressure regulating unit 300 disposed on the movement path along the evaporation gas supply line L3, The pressure is increased by the pressure sensor 320. At this time, the first BOG (G2) having an increased pressure is configured to have a pressure similar to the pressure of the gas (G1) decompressed by the inflator (310). Here, the compressor 320 is a compressor 320 of a general construction, and the inflator 310 compresses the first BOG (G2) using the power generated by reducing the gas G1.

That is, in the pressure regulating unit 300, the inflator 310 is operated by the high-pressure gas G1, and the compressor 320 is operated using the gas G1 to regulate the pressure of the first BOG (G2) . The pressure of the gas G1 and the first BOG G2 is regulated to about 6 to 70 bara by the pressure regulating unit 300, for example.

The gas G1 and the first BOG G2 in which the pressure is changed by the pressure regulating unit 300 are respectively supplied to the gasification supply line L2 and the evaporation gas supply line L3, Is supplied to the mixing unit (500).

The gas G1 and the first BOG G2 supplied to the mixing unit 500 are mixed in the mixing unit 500 and then supplied to the target position along the gas supply line L2. Here, although the pressure of the gas G1 and the pressure of the first BOG G2 are adjusted by the pressure regulating unit 300, the respective temperatures may be different from each other. Accordingly, the mixing unit 500 can control the temperatures of the supplied gas G1 and the first BOG G2 to be mixed with each other evenly.

Since the decompressed gas (G1) and the first BOG (G2) are substantially the same gas, there is no great problem in mixing them in the mixing unit (500).

Next, referring to FIG. 2, a modified configuration for multi-stage compression of the first BOG (G2) conveyed by a plurality of compressors 320 according to an embodiment of the present invention will be described.

FIG. 2 is a view showing a state in which a plurality of compressors 320 are arranged in an evaporative gas processing system using the expansion energy of the gas G1 in FIG.

As shown in the figure, the compressor 320 includes a plurality of compressors 320, which are serially connected in series to compress the first BOG G2 supplied from the evaporation gas supply line L3 step by step. When the compressor 320 compresses the first BOG G2 in multiple stages, the compression efficiency of the first BOG G2 may be increased to reduce the energy used, and the pressure of the decompressed The pressure difference with the gas G1 can be minimized.

Generally, when a high-pressure compression is performed, a compression ratio becomes large with a single compression and deteriorates due to deterioration in volume efficiency. Therefore, decomposition is performed in two or more stages. In this embodiment as well, there are cases where the compressor 320 is compressed as described above, and two or more compressors 320 are used.

In the present embodiment, the compressor 320 compresses the first BOG (G2), which is composed of two main compression means 322 and auxiliary compression means 324 and is conveyed.

The main compression means 322 pressurizes the first BOG (G2) supplied through the evaporation gas supply line (L3) by using the power of the inflator (310).

The auxiliary compression means 324 is constituted by at least one or more than one and is connected to the main compression means 322 to further increase the pressure of the first BOG (G2). Here, the main compression means 322 and the auxiliary compression means 324 are connected in series to increase the pressure of the first BOG (G2) by gradually compressing the first BOG (G2).

Thus, the compressor 320 comprises the main compression means 322 and the auxiliary compression means 324 to compress the first BOG, each of which is connected to the inflator 310 as described above, The first BOG is compressed using the power generated by the expansion of the first BOG.

On the other hand, the second BOG (G3) is generated also in the gas G1 stored in the buffer tank 400 as shown in FIG. Hereinafter, in order to avoid confusion with the first BOG (G2) generated in the main tank, the BOG generated in the main tank is referred to as a first BOG (G2) and the BOG generated in the buffer tank 400 is referred to as a second BOG (G3).

In this embodiment, the first auxiliary supply line L4 and the second auxiliary supply line L5 may be separately provided in order to process the second BOG G3 generated in the buffer tank 400 as described above. More.

The first auxiliary supply line L4 is a line connected to the buffer tank 400 and supplying the second BOG generated by the main compression means 322 to the auxiliary compression means 324, Is supplied to the auxiliary compression means 324 together with the first BOG (G2).

This is because the pressure in the buffer tank 400 is higher than that in the liquefied storage tank 100 and the pressure of the second BOG generated in the liquefied storage tank 100 Is higher than the pressure of the first BOG (G2).

Therefore, the first BOG (G2) is supplied to the auxiliary compression means 324 together with the second BOG (G3) with the pressure increased by the main compression means 322.

By providing the first auxiliary supply line L4 as described above, the second BOG generated in the buffer tank 400 can be compressed and supplied to the target position together with the gas G1.

The second auxiliary supply line L5 is connected to the main compression means 322 and the buffer tank 400 and is selectively compressed by the main compression means 322 in accordance with the pressure in the buffer tank 400 And supplies a part of the first BOG (G2) to the buffer tank 400.

This selectively supplies the compressed first BOG G2 to the buffer tank 400 along the second auxiliary supply line L5 so that the pressure inside the buffer tank 400 is kept constant. When the internal pressure of the buffer tank 400 is lower than the pressure of the compressed first BOG G2, the first BOG G2 is supplied to the buffer tank 400 to increase the internal pressure. In this case, since the pressure of the second BOG (G3) generated in the buffer tank 400 is lower than the pressure of the first BOG (G2) pressurized by the main compression means 322, they are mixed A pressure difference occurs when supplied to the auxiliary compression means 324, thereby causing difficulty in mixing.

Therefore, by selectively supplying a part of the first BOG (G2) whose pressure is increased by the main compression means 322 in accordance with the pressure state inside the buffer tank 400, the pressure of the buffer tank 400 is controlled do.

In this way, the compressor 320 may include the main compression means 322 and the auxiliary compression means 324 to more effectively compress the first BOG G2, and further the first auxiliary supply line L4 and the second auxiliary supply line L5 to maintain the internal pressure of the buffer tank 400 and to generate the second BOG G3 generated together with the first BOG G2, It can be mixed with the gas (G1).

Next, referring to FIG. 3, a configuration in which a separate generator 330 is further provided in the pressure control unit 300 in the evaporative gas processing system according to the embodiment of the present invention will be described.

3 is a diagram showing a configuration in which a separate generator 330 is further included in the evaporative gas processing system using the expansion energy of the gas G1 of FIG.

As shown in the figure, the pressure regulating unit 300 further includes a separate generator 330 in addition to the inflator 310 and the compressor 320 described above.

The generator 330 is configured to generate electric power by using the power generated by the expansion of the inflator 310. The gas G1 is expanded by the inflator 310, The compressor 320 and the generator 330 are configured to be driven simultaneously.

The generator 330 may be a general generator 330. In this embodiment, additional air is further compressed using the power generated by the expansion of the inflator 310 to operate as the generator 330 .

Meanwhile, although not shown in the drawing, the compressor 320 may be configured to be capable of multi-stage compression in the form described with reference to FIG.

Next, referring to FIG. 4, a configuration in which a separate pressure reducing valve is further included in the evaporative gas processing system according to the embodiment of the present invention will be described.

4 is a diagram showing a configuration in which the auxiliary decompression unit 700 is further included in the evaporative gas processing system using the gas (G1) expansion energy of FIG.

Referring to the drawings, the basic configuration is the same as the configuration described above with reference to FIG. 1, but additionally includes a separate auxiliary decompression unit 700.

The auxiliary depressurization unit 700 includes a bypass line 710 and a pressure reducer 720. The bypass line 710 is connected to the gas supply line L2 to selectively supply the vaporized gas G1) to the pressure regulating unit (300). As shown in the figure, the bypass line 710 is connected to the gas supply line L2 at both ends thereof, and the gas G1 passed through the vaporization unit 200 is supplied to the heating unit 600 or the target position .

The decompressor 720 is disposed on the bypass line 710 and transfers the decompressed gas G1 in the gaseous state moving through the bypass line 710 to a low pressure. That is, the pressure reducer 720 is a device for reducing the pressure of the gas G1, which does not include the compressor but is simply moved, unlike the pressure regulating unit 300.

Here, the pressure reducer 720 is configured in various forms. In this embodiment, the pressure reducer 720 uses a Joule Thomson valve.

The auxiliary decompression unit 700 configured as described above decompresses the gas G1 that moves unlike the pressure regulating unit 300 and selectively pressurizes the gas G1 vaporized via the vaporization unit 200 Bypass and decompress.

When the first BOG (G2) generated in the liquefied storage tank 100 is small, it is unnecessary to separately compress the first BOG (G2) by further including the auxiliary decompression unit 700 as described above. The gas G1 is configured to be moved to the auxiliary decompression unit 700 so as to simply decompress the gas G1 vaporized.

Here, the bypass line 710 is branched from the gas supply line L2 and has a separate switching valve to selectively supply the vaporized gas G1 from the pressure regulating unit 300 and the pressure reducing unit In one direction.

Accordingly, when it is not necessary to compress the first BOG (G2), the switch valve moves the gas G1 to be conveyed along the bypass line 710 without being transferred to the pressure regulating unit 300 .

Thus, the gas G1 moved along the bypass line 710 is depressurized by the decompressor 720, and the decompressed gas G1 is transferred to the heater.

When the amount of the first BOG (G2) generated in the liquefied storage tank 100 is large, the auxiliary decompression unit 700 is further provided, The gas G1 is transferred to the pressure regulating unit 300 and the vaporized G1 is transferred to the auxiliary decompression unit 700 when the amount of the generated first BOG G2 is small.

The gas G1 decompressed in the pressure regulating unit 300 or the auxiliary decompression unit 700 is further transferred to the target position along the gas supply line L2.

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 invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: Liquid storage tank 200: Vaporization unit
300: pressure regulating unit 310: inflator
320: compressor 330: generator
400: Buffer tank 500: Mixing unit
600: heating unit 700: decompression unit
710: bypass line 720: pressure reducer
L1: Liquid cargo supply line L2: Gaseous cargo supply line
L3: Evaporative gas supply line L4: First auxiliary supply line
L5: Second auxiliary supply line G1: Gas
G2, G3: BOG

Claims (10)

A liquefied storage tank containing a gas in a liquid state;
A liquid supply line for transferring the gas from the liquid storage tank;
An evaporation gas supply line for transferring a first BOG (BOG) connected to the liquid storage tank;
A vaporization unit connected to the liquefied gas supply line for increasing and vaporizing the pressure of the gas transferred from the liquefied storage tank;
A gas supply line connected to the gasification unit to transfer the vaporized gas to a target position; And
The gas supply line and the evaporation gas supply line, the pressure of the gas passing through the gas-oil supply line is reduced, and the pressure of the first BOG passing through the vapor gas supply line is increased unit; The evaporation gas processing system using the expansion energy of the gas. The method according to claim 1,
The pressure regulating unit includes:
An expander connected to the gas supply line for decompressing the pressure of the gas; And
And a compressor connected to the inflator and connected to the evaporation gas supply line for increasing the pressure of the first BOG supplied by the power generated by the operation of the inflator, system. 3. The method of claim 2,
The compressor includes:
Wherein the evaporation gas supply system comprises a plurality of evaporation gas supply lines, and the evaporation gas supply system includes a plurality of evaporation gas supply lines. 3. The method of claim 2,
And a buffer tank disposed between the liquefied storage tank and the vaporization unit for transferring the gas in a liquid state to be transferred to the vaporization unit and transferring the vapor to the vaporization unit, system. 5. The method of claim 4,
The compressor includes:
Main compression means for boosting the pressure of the first BOG supplied through the evaporation gas supply line; And
At least one auxiliary compression means connected to the main compression means for further boosting the boosted first BOG,
Each of which is serially connected in series to expand the first BOG step by step. 6. The method of claim 5,
A first auxiliary supply line connected to the buffer tank and supplying a second BOG generated in the buffer tank to the auxiliary compression means; And
And a second auxiliary supply line connected to the main compression means and the buffer tank for selectively supplying a part of the first BOG raised in accordance with the pressure inside the buffer tank, Processing system. 3. The method of claim 2,
The pressure regulating unit includes:
Further comprising a generator for generating electric power by using the power generated by the expansion of the inflator. The method according to claim 1,
And a mixing unit which is provided on the gas-oil supply line and is connected to the evaporation gas supply line and mixes the gas and the pressurized first BOG supplied through the pressure regulating unit, and mixes the expanded gas and the expanded gas Evaporative gas treatment system using. The method according to claim 1,
Further comprising a heating unit provided on the gas supply line and heating the gas whose pressure has been reduced by the pressure regulating unit. The method according to claim 1,
A bypass line connected in the gas supply line to selectively bypass the gas in the gaseous state so as not to pass through the pressure regulating unit; And
A pressure reducing unit disposed on the bypass line to lower the pressure of the gas moving; Further comprising an auxiliary decompression unit including an auxiliary decompression unit and an auxiliary decompression unit.

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