KR20210073620A - Fuel supply providing system used in ship - Google Patents

Abstract

A fuel gas supply system for a ship is disclosed. In accordance with an embodiment of the present invention, the fuel gas supply system for a ship comprises: a compression unit for receiving boil-off gas from a storage tank for storing liquefied gas and the boil-off gas of the liquefied gas, and compressing the same; a heat exchange unit for exchanging the heat between the compressed boil-off gas and a refrigerant and liquefying the same; a reliquefaction line for connecting the storage tank, the compression unit, and the heat exchange unit; a liquefied gas supply line for supplying the liquefied gas, received from the storage tank, to a customer; a mixer provided in the liquefied gas supply line, and storing the liquefied gas received from the storage tank; a merging line branched from the space between the compression unit and the heat exchange unit in the reliquefaction line, connected to the mixer, and supplying a portion of the boil-off gas, compressed by the compression unit, to the mixer; a liquid level meter for measuring a liquid level in the mixer; and a control unit for controlling the opening degree of a control valve provided in the merging line based on the measured liquid level to maintain the liquid level in the mixer within a set range. Therefore, the efficiency of boil-off gas reliquefaction and fuel supply can be increased.

Description

Fuel gas supply system for ships {FUEL SUPPLY PROVIDING SYSTEM USED IN SHIP}

The present invention relates to a fuel gas supply system for ships.

As the International Maritime Organization (IMO)'s regulations on the emission of greenhouse gases and various air pollutants are strengthened, the shipbuilding and shipping industry replaces the existing fuels such as heavy oil and diesel oil, and uses natural gas, a clean energy source, as a fuel gas for ships. is being used more and more.

Natural gas, which is widely used among fuel gases, has methane as its main component, and is stored and transported after being changed to a liquefied gas state with its volume reduced to 1/600 in general.

A ship carrying liquefied gas is provided with a storage tank insulated to store the liquefied gas. In addition, such a ship may provide a fuel gas supply system for supplying the fuel of the engine by vaporizing the boil-off gas (Boiled Off Gas) naturally generated in the storage tank or the liquefied gas of the storage tank. Ship engines include low-pressure (about 5-8 bar) injection engines such as DFDE (Dual Fuel Disel Electric) engines, high-pressure (about 150-700 bar) injection engines such as ME-GI engines (Man B&W's gas injection engines) and A medium pressure gas injection engine capable of combustion with fuel gas of medium pressure (about 16 to 18 bar) may be used.

The above-described fuel gas supply system may include re-liquefaction means for re-liquefying and storing the BOG in the storage tank when, for example, more BOG than the fuel consumption required by the ME-GI engine is present in the storage tank. have.

Specifically, the reliquefaction means may include a configuration for pressurizing BOG in the storage tank, cooling the pressurized BOG by heat exchange with a refrigerant, and depressurizing the cooled BOG.

However, during the re-liquefaction process, since the boil-off gas whose temperature has increased by pressurization must be cooled through the refrigerant, a large amount of energy consumption of the refrigerant supply device that circulates and supplies the refrigerant is required, which may reduce the efficiency of the entire system.

Please refer to Korean Patent Publication No. 10-2012-0103409 (published on September 19, 2012) as a related technology.

Korean Patent Publication No. 10-2012-0103409 (published on September 19, 2012)

An embodiment of the present invention is to provide a fuel gas supply system for a ship that can improve the efficiency of BOG reliquefaction and fuel supply together.

Another object of the present invention is to provide a fuel gas supply system for ships that can reduce the amount of compressed BOG to be reliquefied, thereby reducing energy consumption of a refrigerant supply device that circulates and supplies a refrigerant that exchanges heat with the compressed BOG.

According to an aspect of the present invention, the compression unit for receiving the liquefied gas and the boil-off gas from a storage tank for storing the boil-off gas of the liquefied gas and compressing it; a heat exchange unit for liquefying the compressed boil-off gas by heat exchange with a refrigerant; a reliquefaction line connecting the storage tank, the compression unit, and the heat exchange unit; a liquefied gas supply line for supplying the liquefied gas supplied from the storage tank to a consumer; a mixer provided in the liquefied gas supply line and configured to store the liquefied gas supplied from the storage tank; a merging line branched from between the compression unit and the heat exchange unit of the reliquefaction line and connected to the mixer, and supplying a portion of the boil-off gas compressed by the compression unit to the mixer; a liquid level meter for measuring the liquid level in the mixer; and a control unit for maintaining the liquid level in the mixer within a set range by controlling the degree of opening of the control valve provided on the merging line based on the measured liquid level; have.

A pressure measuring device for measuring the pressure in the mixer, and compressing the liquefied gas supplied from the storage tank to the same pressure as the pressure of the fluid passing through the compression unit and supplying it to the mixer, open based on the measured pressure in the mixer It may further include a compression pump whose degree is controlled.

and a high-pressure pump for compressing the fluid supplied from the mixer according to the requirements of the consumer, and a vaporizer for vaporizing the compressed fluid and supplying it to the consumer, wherein the liquefied gas supply line includes the storage tank and the compression pump. , mixer, high-pressure pump, carburetor and demand can be connected sequentially.

The mixer and the front end of the heat exchange unit of the reliquefaction line are connected, and the gas component generated in the mixer is supplied to the front end of the heat exchange unit of the reliquefaction line, mixed with the boil-off gas compressed by the compression unit, and introduced into the heat exchange unit. It may further include a resupply line to make it possible.

The compression unit includes one or more compressors and coolers arranged alternately, a gas-liquid separator configured to separate the mixed fluid cooled by heat exchange with a refrigerant by the heat exchange unit into a gas component and a liquid component; a liquid component supply line for supplying heat to the cooler to exchange heat with the boil-off gas compressed by the compressor, and a pressure reducing valve branched from the liquid component supply line and connected to the cooler to receive a portion of the separated liquid component and reduce pressure; A decompression line provided, a recovery line that receives the mixture of the decompressed liquid component and the heat-exchanged liquid component from the cooler and sends it to the storage tank, and supplies the separated gas component to the front end of the compression unit of the reliquefaction line It is provided in front of the gas component supply line and the compression part of the reliquefaction line, the boil-off gas supplied from the storage tank and the gas component supplied through the gas component supply line are mixed and stored, and contained in the mixed fluid It may further include a knockout drum to remove impurities of the liquid component by its own weight.

The fuel gas supply system for ships according to an embodiment of the present invention can improve the efficiency of BOG reliquefaction and fuel supply together.

In addition, by reducing the amount of the compressed BOG to be reliquefied, it is possible to reduce the energy consumption of the refrigerant supply device that circulates and supplies the refrigerant that exchanges heat with the compressed BOG.

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

1 shows a fuel gas supply system for a ship 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. 1 shows a fuel gas supply system for a ship according to an embodiment of the present invention.

Referring to FIG. 1 , the fuel gas supply system 100 for a ship according to an embodiment of the present invention is a compression unit 110 for receiving and compressing boil-off gas from a storage tank 101 for storing boil-off gas of liquefied gas and liquefied gas. ), a heat exchange unit 120 for liquefying the boil-off gas compressed by the compression unit 110 by heat exchange with a refrigerant, and re-liquefaction connecting the storage tank 101 , the compression unit 110 and the heat exchange unit 120 . The line L1, the liquefied gas supply line L2 for supplying the liquefied gas supplied from the storage tank 101 to the consumer E, and the liquefied gas supply line L2 are provided in the storage tank 101 The mixer 160 for storing the supplied liquefied gas is branched from between the compression unit 110 and the heat exchange unit 120 of the reliquefaction line L1 and is connected to the mixer 160, and is The merging line L3 for supplying some of the compressed BOG to the mixer 160, the liquid level meter 180 for measuring the liquid level in the mixer 160, and the liquid measured by the liquid level meter 180 and a control unit 190 for controlling the degree of opening of the control valve V1 provided on the merging line L3 based on the level to maintain the liquid level in the mixer 160 within a set range.

In addition, the fuel gas supply system 100 for ships includes a pressure measuring instrument 170 measuring the pressure in the mixer 160 and the pressure of the fluid passing the liquefied gas supplied from the storage tank 101 to the compression unit 110 and It is compressed at the same pressure and supplied to the mixer 160 , but includes a compression pump P3 whose opening degree is controlled based on the pressure in the mixer 160 measured by the pressure gauge 170 .

In addition, the marine fuel gas supply system 100 is provided inside the storage tank 101, and pumps the liquefied gas at a set pressure and supplies it to the compression pump P3 through the liquefied gas supply line L2. The internal pump P2 ), a high-pressure pump (P1) that compresses the fluid supplied from the mixer 160 to meet the requirements of the consumer (E), and vaporizes the fluid compressed by the high-pressure pump (P1) to supply it to the consumer (E) It includes a vaporizer 130 . At this time, the liquefied gas supply line L2 sequentially connects the internal pump P2, the compression pump P3, the mixer 160, the high pressure pump P1, the carburetor 130, and the customer E.

In addition, the marine fuel gas supply system 100 connects the mixer 160 and the front end of the heat exchange unit 120 of the reliquefaction line (L1), and heat exchanges the gas component generated in the mixer 160 with the reliquefaction line (L1). It includes a resupply line L11 for supplying to the front end of the unit 120 and mixing it with the boil-off gas compressed by the compression unit 110 to flow into the heat exchange unit 120 .

The above-described compression unit 110 includes one or more compressors 112 and a cooler 114 arranged alternately. And, the fuel gas supply system 100 for ships is a (mixed) fluid liquefied by heat exchange with the refrigerant by the heat exchange unit 120, that is, the gas component and the compression unit in the mixer 160 supplied through the re-supply line L11. The gas-liquid separator 140 for separating the mixture of BOG compressed by 110 into a gas component and a liquid component, and the liquid component separated by the gas-liquid separator 140 with BOG compressed by the compressor 112 A liquid component supply line (L4) for supplying heat exchange to the cooler (114), branched from the liquid component supply line (L4) and connected to the cooler (114), some of the liquid components separated by the gas-liquid separator (140) A mixture of the liquid component decompressed by the pressure reducing valve 117 and the liquid component exchanging heat with the compressed boil-off gas is supplied and stored from the pressure reducing line L5 provided with the pressure reducing valve 117 for receiving and reducing the pressure, and the cooler 114 . Includes a recovery line (L6) sent to the tank (101), and a gas component supply line (L7) for supplying the gas component separated by the gas-liquid separator 140 to the front end of the compression unit 110 of the reliquefaction line (L1) do.

In addition, the fuel gas supply system 100 for ships is provided at the front end of the compression unit 110 of the reliquefaction line L1, and supplies boil-off gas and gas components supplied from the storage tank 101 through the reliquefaction line L1. It may include a knock-out drum 150 (Knock out-drum) that mixes and stores the gas components supplied through the line (L6) in, and removes impurities of the liquid component contained in the mixed fluid by its own weight.

The fuel gas supply system 100 for a ship according to an embodiment of the present invention is various liquefied fuel carriers, liquefied fuel RV (Regasification Vessel), container ship, general merchant ship, LNG FPSO (Floating, Production, Storage and Off-loading), LNG It may be applied to a ship including a Floating Storage and Regasification Unit (FSRU) and the like.

Hereinafter, each component will be described in detail.

The above-described storage tank 101 may include a membrane type tank, an SPB type tank, etc. for storing fuel in a liquefied state while maintaining a thermal insulation state. The liquefied gas stored in the storage tank 101 may be any one of LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas), DME (Dimethylether), and ethane that can be stored in a liquefied state, but is not limited thereto. . Hereinafter, an example in which ethane is stored in the storage tank 101 will be described.

An internal pump P2 may be provided inside the storage tank 101, and the liquefied gas pumped by the internal pump P2 is delivered to the compression pump P3 through the liquefied gas supply line L2.

The compression unit 110 receives and compresses BOG from the storage tank 101 through the reliquefaction line L1, and one or more compressors 112; 112a to 112c and coolers 114; 114a to 114c alternately arranged. ) may be included. In the embodiment of the present invention, a multi-stage compression unit 110 provided in three stages will be described as an example. For example, the final pressure and temperature of the boil-off gas that has passed through each of the compressors 112a to 112c and the coolers 114a to 114c may be 30 barA and 40°C. Here, the second cooler 114b and the third cooler 114c may cool the compressed BOG using glycol water and seawater, respectively. The first cooler 114a will be described later along with related components.

The heat exchange unit 120 performs heat exchange between the refrigerant circulated and supplied through the refrigerant circulation line L10 and the boil-off gas compressed by the compression unit 110 . At this time, when the gas component generated in the mixer 160 is mixed with the boil-off gas compressed by the compression unit 110 through the resupply line L11 to be described later, the heat exchange unit 120 mixes the mixed fluid with the refrigerant. can be heat exchanged. The gas component supplied from the mixer 160 through the resupply line L11 is mixed with the boil-off gas compressed by the compression unit 110 to lower the temperature.

The refrigerant may be supplied from the refrigerant supply device 125 , and the heat-exchanged refrigerant may be cooled to a temperature set by the refrigerant supply device 125 , and then circulated and supplied through the refrigerant circulation line L10 . Accordingly, energy is consumed by the refrigerant supply device 125 in order to circulate and supply the refrigerant at a set temperature. In order to reduce such energy consumption and improve overall system efficiency, the amount of BOG to be reliquefied may be reduced through an embodiment of the present invention.

To this end, the merging line L3 branched from between the compression unit 110 and the heat exchange unit 120 of the re-liquefaction line L1 is connected to the mixer 160 of the liquefied gas supply line L2, and the compression unit Some of the boil-off gas compressed by 110 is joined to the mixer 160 so as to be supplied as fuel to the consumer E. Through this, it is possible to reduce the amount of reliquefaction of the boil-off gas, which is pressurized by the compression unit 110 and has an increased temperature.

The mixer 160 mixes and stores the liquefied gas supplied from the storage tank 101 through the liquefied gas supply line L2 and the compressed boil-off gas supplied through the merging line L3. Since the compressed BOG supplied through the merging line L3 is already pressurized by the compression unit 110 , the temperature of the boil-off gas in the mixer 160 is not as low as that of the liquefied gas (eg, ethane) in the storage tank 101 . It may be mixed with the liquefied gas supplied from the storage tank 101 to be phase-changed into a liquid state.

Since the mixer 160 also performs the function of the gas-liquid separator at the same time, it is possible to prevent the gas component from flowing into the high-pressure pump P1. The gas component that has not been converted into a liquid in the mixer 160 is transferred through the re-supply line L11 to the front end of the heat exchange unit 120 of the re-liquefaction line L1, that is, specifically from the re-liquefaction line L1 to the merging line L3. The branching point P is supplied to the rear end, which is mixed with the boil-off gas compressed by the compression unit 110 and introduced into the heat exchange unit 120 . Since the gas component supplied through the resupply line L11 is in a state in which the temperature has dropped in the mixer 160, it is mixed with the boil-off gas compressed by the compression unit 110 to lower the temperature to the heat exchange unit 120. is brought in

Therefore, in order to liquefy the fluid flowing into the heat exchange unit 120 , the energy consumption of the refrigerant supply device 125 , which circulates and supplies to the heat exchange unit 120 while maintaining the cooling heat of the refrigerant at a constant temperature, is reduced, which in turn reduces the energy consumption of the entire system. can improve the efficiency of

On the other hand, in the operation of the above-described mixer 160, in order to detect an excess when a portion of the boil-off gas compressed by the compression unit 110 flows to the mixer 160 through the merging line L3, the merging line L3 ) there is a need to control the amount of compressed BOG flowing into the mixer 160 through the.

To this end, the liquid level meter 180 measures the liquid level in the mixer 160 , and the controller 190 controls the control valve provided on the merging line L3 based on the liquid level measured by the liquid level meter 180 . By controlling the opening degree of (V1), the liquid level in the mixer 160 is maintained within a set range.

Specifically, when an excessive amount of compressed BOG is introduced into the mixer 160, the temperature inside the mixer 160 rises to increase the amount of gas components, and the liquid level falls. In this case, the controller 190 closes the control valve V1 on the merging line L3 or decreases the degree of opening to reduce the amount of compressed BOG introduced into the mixer 160 . Conversely, when the liquid level inside the mixer 160 increases, it means that the temperature is sufficiently low, so the degree of opening of the control valve V1 on the merging line L3 is increased to increase the compressed BOG introduced into the mixer 160 . can increase the amount of

In addition, when the fuel consumption increases due to an increase in the load of the consumer E, the pressure inside the mixer 160 drops, so it is necessary to maintain the pressure inside the mixer 160 within a set range. To this end, the pressure gauge 170 may measure the pressure in the mixer 160 , and the degree of opening of the compression pump P3 may be controlled based on the pressure in the mixer 160 measured by the pressure gauge 170 . In this case, the pressure value measured by the pressure meter 170 may be transmitted to the above-described control unit 190 .

When the pressure in the mixer 160 falls below the set value, the controller 190 controls the compression pump P3 to increase the amount of liquefied gas supplied into the mixer 160 through the liquefied gas supply line L2. can do it Conversely, when the pressure in the mixer 160 exceeds the set value, the amount of liquefied gas supplied into the mixer 160 through the liquefied gas supply line L2 by controlling the compression pump P3 can be reduced.

At this time, the compression pump P3 pressurizes the liquefied gas supplied from the storage tank 101 to the same pressure as the pressure of the fluid (evaporated gas) that has passed through the above-described compression unit 110 to send it to the mixer 160. . For example, the liquefied gas pressurized by the compression pump P3 may have a pressure of 30 barA equal to the pressure of the fluid passing through the compression unit 110, and the temperature at this time may be approximately -91°C.

The high-pressure pump P1 provided in the liquefied gas supply line L2 compresses the fluid supplied from the mixer 160 to meet the requirements of the consumer E. For example, the fluid that has passed through the high-pressure pump P1 may be in a state of 380 barA and -70°C.

The vaporizer 130 vaporizes the fluid compressed by the high-pressure pump P1 and supplies it to the consumer E. The fluid passing through the vaporizer 130 may be in a state of 380 barA, -45°C.

The consumer E may include, for example, an ME-LGI engine using ethane as a fuel.

On the other hand, the boil-off gas (A) compressed by the compression unit 110 and the gas component (B) supplied from the mixer 160 are merged and flow into the heat exchange unit 120 through the reliquefaction line L1, and the refrigerant and After being liquefied by heat exchange, it is supplied to the gas-liquid separator 140 .

The gas-liquid separator 140 separates the corresponding fluid A+B that has passed through the heat exchange unit 120 into a gas component and a liquid component.

Here, the liquid component separated by the gas-liquid separator 140 is a cooling heat exchanger included in the first cooler 114a so as to exchange heat with the boil-off gas compressed by the first compressor 112a through the liquid component supply line L4. (115). In the exemplary embodiment of the present invention, the liquid component separated by the gas-liquid separator 140 is supplied to the first cooler 114a as an example, but in another example, the second cooler 114b or the third cooler 114c. It may be supplied and used to cool the boil-off gas compressed by the compressor 112 .

Then, a portion of the liquid component separated by the gas-liquid separator 140 through the pressure reducing line L5 branched from the liquid component supply line L4 and connected to the first cooler 114a is supplied to the pressure reducing valve 117 and reduced pressure. and then introduced into the first cooler 114a.

The fluid (A + B) liquefied by heat exchange with the refrigerant by the above-described heat exchange unit 120 may maintain a liquid state of 30 barA and -36° C., but when stored directly in the storage tank 101, it is converted to a gaseous state. Since it can be converted, there is a need to maintain a liquid state even when stored in the storage tank 101 .

Accordingly, in the embodiment of the present invention, some of the liquid components separated by the gas-liquid separator 140 are supplied to the pressure reducing valve 117 through the pressure reducing line L5 and converted to 3.5 barA, -80° C., and then the first It is supplied to the cooler 114a. Through this, the liquid component separated by the gas-liquid separator 140, which is supplied to the cooling heat exchanger 115 through the liquid component supply line L4 and exchanged heat with the compressed boil-off gas, and the pressure reduced by the pressure reducing valve 117 described above. The mixture of liquid components is converted to a state of 29 barA and -59° C. and can be stored in a liquid state in the storage tank 101 through the recovery line L6.

The gas component supply line L7 supplies the gas component separated by the gas-liquid separator 140 to the front end of the compression unit 110 of the reliquefaction line L1.

At this time, the knockout drum 150 provided at the front end of the compression unit 110 of the reliquefaction line L1 is the boil-off gas and gas component supply line L6 supplied from the storage tank 101 through the reliquefaction line L1. The gas components supplied through the gas are mixed and stored, and impurities of the liquid components contained in the mixed fluid are removed by their own weight. Ships storing ethane as cargo may contain substances such as propane or butane. At this time, when a strong flow phenomenon occurs, a substance such as propane or butane of a liquid component flows into the compression unit 110 in the state of being contained in the boil-off gas in the form of oil droplets, which may cause a problem in the performance of the compression unit 110. .

Accordingly, in the embodiment of the present invention, the liquid component in the form of an oil droplet can be purified by its own weight through the knockout drum 150, so that the liquid component accompanying the boil-off gas can be separated. Although not shown, the liquid component separated from the knockout drum 150 may be recovered to the storage tank 101 .

In the above, specific embodiments have been shown and described. However, the present invention is not limited to the above embodiments, and those of ordinary skill in the art to which the invention pertains may make various changes without departing from the spirit of the invention described in the claims below. will be able

101: storage tank 110: compression unit
112: compressor 114: cooler
117: pressure reducing valve 120: heat exchange unit
125: refrigerant supply 130: carburetor
140: gas-liquid separator 150: knockout drum
160: mixer 170: liquid level meter
180: pressure gauge 190: control unit
L1: Re-liquefaction line L2: Liquefied gas supply line
L3: merging line L4: liquid component supply line
L5: decompression line L6: return line
L7: gas component supply line L10: refrigerant circulation line
L11: Resupply line P1: High pressure pump
P2: Internal pump P3: Compression pump
V1: control valve

Claims (5)

a compression unit receiving the liquefied gas and the boil-off gas from a storage tank storing the boil-off gas of the liquefied gas and compressing it;
a heat exchange unit for liquefying the compressed boil-off gas by heat exchange with a refrigerant;
a reliquefaction line connecting the storage tank, the compression unit, and the heat exchange unit;
a liquefied gas supply line for supplying the liquefied gas supplied from the storage tank to a consumer;
a mixer provided in the liquefied gas supply line and configured to store the liquefied gas supplied from the storage tank;
a merging line branched from between the compression unit and the heat exchange unit of the reliquefaction line and connected to the mixer, and supplying a portion of the boil-off gas compressed by the compression unit to the mixer;
a liquid level meter for measuring the liquid level in the mixer; and
A control unit for maintaining the liquid level in the mixer within a set range by controlling the degree of opening of the control valve provided on the merging line based on the measured liquid level. According to claim 1,
a pressure gauge for measuring the pressure in the mixer;
The liquefied gas supplied from the storage tank is compressed to the same pressure as the pressure of the fluid passing through the compression unit and supplied to the mixer, further comprising a compression pump whose opening degree is controlled based on the measured pressure in the mixer. fuel gas supply system. 3. The method of claim 2,
A high-pressure pump for compressing the fluid supplied from the mixer according to the requirements of the customer;
Further comprising a vaporizer that vaporizes the compressed fluid and supplies it to the consumer,
The liquefied gas supply line is a fuel gas supply system for ships that sequentially connects the storage tank, the compression pump, the mixer, the high-pressure pump, the carburetor, and the customer. According to claim 1,
The mixer and the front end of the heat exchange unit of the reliquefaction line are connected, and the gas component generated in the mixer is supplied to the front end of the heat exchange unit of the reliquefaction line, mixed with the boil-off gas compressed by the compression unit, and introduced into the heat exchange unit. A fuel gas supply system for ships further comprising a re-supply line to be enabled. According to claim 1,
The compression unit comprises one or more compressors and coolers arranged alternately,
a gas-liquid separator for separating the mixed fluid cooled by heat exchange with the refrigerant by the heat exchange unit into a gas component and a liquid component;
a liquid component supply line for supplying the separated liquid component to the cooler to exchange heat with the boil-off gas compressed by the compressor;
a pressure reducing line branched from the liquid component supply line and connected to the cooler, provided with a pressure reducing valve for receiving a portion of the separated liquid component and reducing the pressure;
a recovery line that receives the mixture of the decompressed liquid component and the heat-exchanged liquid component from the cooler and sends it to the storage tank;
a gas component supply line for supplying the separated gas component to the front end of the compression unit of the reliquefaction line;
It is provided at the front end of the compression part of the reliquefaction line, the boil-off gas supplied from the storage tank and the gas component supplied through the gas component supply line are mixed and stored, and impurities of the liquid component contained in the mixed fluid are removed. A fuel gas supply system for ships further comprising a knockout drum removed by its own weight.

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