KR102280770B1 - liquefied gas treatment system and ship having the same - Google Patents

Abstract

The present invention relates to a gas treatment system and a vessel including the same. The gas treatment system includes: a liquefied gas storage tank storing liquefied gas therein, and having a cargo pump for loading and unloading the liquefied gas; a liquefied gas vaporizer provided for gassing-up to substitute inert gas with liquefied gas by heating and injecting the liquefied gas into the liquefied gas storage gas filled with the inert gas before loading; and a boiloff gas compressor provided for warming-up to vaporize residual liquefied gas by compressing boiloff gas produced from the liquefied gas storage tank and injecting the same into the liquefied gas storage tank in a state in which the liquefied gas is remaining after loading and unloading by the cargo pump. The liquefied gas vaporizer is provided such that the boiloff gas compressed by the boiloff gas compressor and injected into the liquefied gas storage tank flows via the vaporizer, thereby heating the boiloff gas compressed by the boiloff gas compressor and delivering the same to the liquefied gas storage tank.

Description

A gas treatment system and a ship including the same {liquefied gas treatment system and ship having the same}

The present invention relates to a gas treatment system and a ship comprising the same.

A ship is a means of transport that carries a large amount of minerals, crude oil, natural gas, or thousands of containers or more and sails the ocean. It is made of steel and floats on the waterline due to buoyancy. move through

Such a ship generates thrust by driving an engine or a gas turbine, etc. In this case, the engine uses oil fuel such as gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, and the shaft connected to the crankshaft is rotated to drive the propeller, while the gas turbine burns fuel with compressed air, and uses the temperature/pressure of the combustion air to rotate turbine blades to generate power and transmit power to the propeller.

However, recently, an LNG fuel supply method in which LNG is used as a fuel to drive a consumer such as an engine or a turbine is used in an LNG carrier that transports liquefied natural gas, a type of liquefied gas, and LNG is a clean fuel. And since the reserves are more abundant than petroleum, the method of using LNG as a fuel for consumers is being applied to ships other than LNG carriers.

However, compared to the conventional case of using oil fuel such as diesel, there are a number of problems to be solved in the case of using LNG, which is gas fuel. Ongoing research and development is in progress.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to omit some components or prepare a backup structure to prepare for operational errors in the supply of liquefied gas as fuel of the engine. By having it, it is to provide a stable and highly reliable gas processing system and a ship including the same.

A gas processing system according to an aspect of the present invention includes: a liquefied gas storage tank that stores liquefied gas therein, and is provided with a cargo pump for unloading liquefied gas; A liquefied gas vaporizer provided for gassing-up by heating and injecting liquefied gas into the liquefied gas storage tank in a state in which the inert gas is filled before loading to replace the inert gas with liquefied gas; And BOG provided for warm-up of vaporizing the residual liquefied gas by compressing the BOG generated in the liquefied gas storage tank in a state in which the liquefied gas remains after unloading by the cargo pump and injecting it into the liquefied gas storage tank. includes a compressor, wherein the liquefied gas vaporizer is provided so that the boil-off gas compressed in the boil-off gas compressor and injected into the liquefied gas storage tank passes through, and heats the boil-off gas compressed in the boil-off gas compressor to the liquefied gas storage tank It is characterized by transmission.

Specifically, the liquefied gas vaporizer may have one inlet through which liquefied gas or BOG is selectively introduced, and one outlet through which vaporized liquefied gas or heated BOG is selectively discharged.

Specifically, the gassing-up may further include a vent mast for discharging the inert gas substituted by the liquefied gas to the outside.

Specifically, the vent mast may discharge at least a portion of the boil-off gas discharged from the liquefied gas storage tank during warm-up to the outside.

Specifically, the BOG compressor is a high-load compressor, and may further include a low-load compressor that compresses BOG generated in the liquefied gas storage tank and supplies it to the engine.

Specifically, a gasing-up line in which the liquefied gas heated in the liquefied gas vaporizer is introduced into the liquefied gas storage tank; and a warm-up line through which the boil-off gas compressed by the boil-off gas compressor and heated in the liquefied gas vaporizer flows into the liquefied gas storage tank, wherein the gasing-up line and the warm-up line are, You can share a gas vaporizer.

Specifically, it may further include a bypass line provided to bypass the liquefied gas vaporizer.

Specifically, the bypass line may include: a first bypass line in which liquefied gas flows and a first bypass valve of a first specification is provided; and a second bypass line through which boil-off gas flows and a second bypass valve of a second specification different from the first specification is provided.

A ship according to an aspect of the present invention is characterized in that it has the gas treatment system.

The gas treatment system according to the present invention and a ship including the same can be provided to omit a fuel pump or to enable a backup of a forced carburetor or a gas heater to significantly reduce system construction costs and significantly reduce operating costs. .

1 to 3 are conceptual views of a gas processing system according to a first embodiment of the present invention.
4 is a conceptual diagram of a gas processing system according to a second embodiment of the present invention.
5 is a conceptual diagram of a gas processing system according to a third embodiment of the present invention.
6 is a conceptual diagram of a gas processing system according to a fourth embodiment of the present invention.
7 and 8 are conceptual views of a gas processing system according to a fifth embodiment of the present invention.
9 is a conceptual diagram of a gas processing system according to a sixth embodiment of the present invention.
10 is a conceptual diagram of a gas processing system according to a seventh embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, a gas processing system of the present invention will be described, and the present invention includes a gas processing system and a vessel having the same (including all structures that may be located in the ocean, such as merchant ships, offshore plants, and offshore structures).

Hereinafter, in this specification, liquefied gas may be used to encompass all gas fuels that are generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc., and boil-off gas (BOG) is naturally vaporized or It may mean forced vaporized liquefied gas. However, the boil-off gas may be used to include not only gaseous boil-off gas but also liquefied boil-off gas.

Also, liquefied gas in the following may be used as a term encompassing both a liquid state, a natural vaporized or forced vaporized state, etc. However, boil-off gas is a term meaning a gas naturally vaporized in the liquefied gas storage tank 10 . Note that it can be used as

1 to 3 are conceptual views of a gas processing system according to a first embodiment of the present invention.

1 to 3 , the gas treatment system 1 according to the first embodiment of the present invention includes a liquefied gas storage tank 10 , a boost pump 20 , a boil-off gas compressor 30 , and a forced vaporizer ( 40), a mist separator 50, a gas heater 60, and a liquefied gas vaporizer 70.

The liquefied gas storage tank 10 stores liquefied gas therein. In the present invention, the liquefied gas storage tank 10 may be a cargo tank for storing liquefied gas as cargo, and in order to store the liquefied gas as a liquid, the liquefied gas storage tank 10 has a thermal insulation wall structure that implements thermal insulation performance above a certain level. can have

For example, the liquefied gas storage tank 10 may be provided in a conventionally well-known membrane type, independent type, etc., and the type may not be particularly limited.

In the liquefied gas storage tank 10, a cargo pump 12 for unloading liquefied gas may be provided. The cargo pump 12 unloads the liquefied gas stored in the liquefied gas storage tank 10 to a consumer such as onshore, and a plurality of each liquefied gas storage tank 10 may be provided for backup.

In addition, a spray pump 11 is provided inside the liquefied gas storage tank 10 . The spray pump 11 may be connected to a spray nozzle provided in the liquefied gas storage tank 10 , and circulate the liquefied gas toward the spray nozzle, thereby implementing a cool-down through the spray nozzle.

In addition, the spray pump 11 can be used to cool down each line through which liquefied gas flows in the pre-stage of cargo operation, and priming (cargo pump 12) of the line where liquefied gas is discharged from the liquefied gas storage tank 10 ) can be implemented to prevent surging at the start of the operation.

In addition, the spray pump 11 may utilize the liquefied gas vaporizer 70 to be described later to implement an increase in the internal pressure of the liquefied gas storage tank 10 to help unloading.

It should be noted that the spray pump 11 of the present invention means a spray pump generally used in the field of liquefied gas processing. However, in the present specification, the spray pump 11 may be replaced with a stripping pump used as a general name in the field of liquefied gas processing.

In this embodiment, the liquefied gas stored in the liquefied gas storage tank 10 may be used as a fuel of the engine 100, wherein the engine 100 includes a propulsion engine 110 for propulsion of a ship, and power generation for power generation. It may be divided into an engine 120 .

The propulsion engine 110 may be an engine 100 known by names such as ME-GI and X-DF, and may be a relatively high-pressure engine 100 having a required pressure such as 300 bar or 17 bar.

The power generation engine 120 may be an engine 100 known by a name such as DFDE, and may be a low-pressure engine 100 having a relatively low required pressure such as 10 bar.

Of course, the type of the engine 100 is not particularly limited, and in the case of electric propulsion, both the propulsion engine 110 and the power generation engine 120 may be provided with DFDE. However, in the following description, for convenience, the propulsion engine 110 is the high-pressure engine 100 and the power generation engine 120 is the low-pressure engine 100 .

In general, in order to supply the liquefied gas stored in the liquefied gas storage tank 10 to the engine 100, a pump (cargo pump 12, spray pump 11) required for processing the liquefied gas when storing the liquefied gas as a cargo , stripping pump, etc.) must be equipped with a fuel pump.

However, when a fuel pump having a discharge pressure corresponding to the required pressure of the engine 100 is provided in the liquefied gas storage tank 10, the fuel pump has a high head compared to pumps that process liquefied gas as a cargo, The liquid level required for operation is relatively high.

Accordingly, the minimum heel required to leave the minimum amount of liquefied gas in the liquefied gas storage tank 10 is relatively high when a fuel pump is provided, which means that the transport capacity of the liquefied gas is reduced and the transport capacity is lowered. .

In this embodiment, in order to solve this problem, the spray pump 11 itself may be used as a fuel pump, and a separate fuel pump may not be provided.

However, the discharge pressure of the spray pump 11 may be lower than the required pressure of the engine 100 (in particular, it may be the power generation engine 120 ). Therefore, between the spray pump 11 and the engine 100 of the present embodiment, a boost pump 20 to be described later is provided.

Hereinafter, with reference to FIGS. 2 and 3 , the control of the spray pump 11 will be described.

Referring to FIG. 2 first, the liquefied gas discharged by the spray pump 11 is delivered to the engine 100 through the liquefied gas supply line L2, and the liquefied gas supply line L2 has a bypass line L20. This can be provided.

The bypass line L20 is a line branched from the downstream of the spray pump 11 and returned to the liquefied gas storage tank 10, and a bypass valve V20 is provided. At this time, the bypass valve V20 may return at least a portion of the liquefied gas discharged from the spray pump 11 to the liquefied gas storage tank 10 .

In order to use the spray pump 11 for fuel supply, it is necessary to control the flow rate and pressure. In the case of the spray pump 11 , it is possible to suppress cavitation by ensuring a minimum flow rate, so that gas is not introduced or generated in the spray pump 11 .

In addition, if the pressure discharged by the spray pump 11 becomes too high, the inlet pressure in the boost pump 20 may not be properly adjusted, which may cause a problem in the operation of the boost pump 20 , and is transmitted to the engine 100 side. The pressure of the liquefied gas may be made improperly.

Therefore, the (minimum) flow rate must be adjusted for the spray pump (11), and the (maximum) pressure must be adjusted.

For this purpose, in the case of FIG. 2 , a bypass valve V20 and a discharge valve (not shown) may be used together. That is, by using a discharge valve provided upstream (or downstream, etc.) of the branching point of the bypass line L20 on the liquefied gas supply line L2, the load of the spray pump 11 is controlled to match the minimum flow rate. can In addition, by using the bypass valve (V20), it is possible to control the supply pressure of the spray pump (11) to a predetermined value or less.

On the other hand, in the case of FIG. 3, unlike FIG. 2, the discharge valve may be omitted, and both the flow rate and the pressure may be controlled using the bypass valve V20. Specifically, in FIG. 3 , the bypass valve V20 is a first for ensuring the minimum flow rate of the spray pump 11 based on the load value of the spray pump 11 and the pressure value of the discharge end of the spray pump 11 . The opening degree can be controlled using the opening value and the second opening value for limiting the maximum pressure of the liquefied gas discharged from the spray pump 11 .

That is, in the case of Figure 2, the bypass valve (V20) is used only for the purpose of limiting the maximum pressure and a discharge valve must be provided to ensure the minimum flow rate, but in the case of Figure 3, the minimum flow rate can be guaranteed only with the bypass valve (V20) will do

Accordingly, in the case of FIG. 3 , as compared with FIG. 2 , the discharge valve is eliminated due to the improvement of logic, thereby reducing costs.

It should be noted that the above valve control contents can be applied to all pumps described below.

The boost pump 20 is provided between the spray pump 11 and the engine 100 , and pressurizes the liquefied gas to the required pressure of the engine 100 . As described above, the spray pump 11 is not provided for fuel supply, but a pump provided for internal cool-down spraying of the liquefied gas storage tank 10 , so the discharge pressure is lower than that of the engine 100 . .

Therefore, the boost pump 20 may further pressurize and deliver the liquefied gas in order to raise the pressure of the liquefied gas discharged from the spray pump 11 to the required pressure of the engine 100 .

The boost pump 20 pressurizes the liquefied gas discharged from the liquefied gas storage tank 10 through the spray pump 11 , and is provided outside the liquefied gas storage tank 10 , so unlike the spray pump 11 , it is a submersible type. (submerged), the type of boost pump 20 and spray pump 11 (centrifugal, screw, reciprocating, etc.) may be the same or different from each other.

The boost pump 20 may be provided between the spray pump 11 and the forced vaporizer 40 to be described later. In this case, since the forced carburetor 40 vaporizes the pressurized liquefied gas to correspond to the required pressure of the engine 100, there may be no means for separately increasing the pressure between the forced carburetor 40 and the engine 100. .

The BOG compressor 30 compresses BOG generated in the liquefied gas storage tank 10 and supplies it to the engine 100 . The boil-off gas compressor 30 is provided in multiple stages, and the number of stages or compressor types is not particularly limited.

The BOG compressor 30 may be provided on the BOG supply line L1 so that BOG generated in the liquefied gas storage tank 10 and discharged is delivered to the engine 100 . That is, the boil-off gas supply line L1 is provided to pass through the boil-off gas compressor 30 .

In addition, the liquefied gas discharged from the spray pump 11 described above may be delivered to the engine 100 through the liquefied gas supply line L2 via the forced carburetor 40, but only the liquefied gas supply line L2. is connected to the downstream of the boil-off gas compressor 30 in the boil-off gas supply line (L1), and can deliver liquefied gas to the boil-off gas downstream of the boil-off gas compressor 30 .

The liquefied gas storage tank 10 provided on the ship may be provided in plurality, and the boil-off gas discharged from the liquefied gas storage tank 10 is collected by the boil-off gas header L10 (vapor header, vapor main), and evaporated. It may be delivered to the boil-off gas compressor 30 through the gas supply line (L1).

The boil-off gas compressor 30 compresses the boil-off gas according to the required pressure of the engine 100 . At this time, the boil-off gas compressor 30 may compress the boil-off gas according to the required pressure of the propulsion engine 110 .

For example, in this embodiment, when the propulsion engine 110 is the X-DF engine 100 and the power generation engine 120 is a DFDE, the discharge pressure of the boil-off gas compressor 30 (and the boost pump 20) is propulsion. It may be around 17 bar corresponding to the required pressure of the engine 110 .

However, in the power generation engine 120, the boil-off gas supply line (L1) may be branched from the upstream of the propulsion engine 110, and the boil-off gas/liquefied gas with a slightly lowered pressure is introduced through a pressure control valve (not shown). can be

When the ship of the present invention is a gas carrier that loads liquefied gas as a cargo, the present invention provides a gas source for a large amount of boil-off gas generated in the liquefied gas storage tank 10 when the liquefied gas is loaded into the liquefied gas storage tank 10 . As a compressor that compresses in order to return to , a high-load compressor 32 (High-Duty Compressor) is essentially provided.

In this regard, in the case of the BOG compressor 30 described above, a relatively small amount of BOG generated in the liquefied gas storage tank 10 during operation is delivered to the engine 100, and the low-load compressor 31 (Low- Duty Compressor).

That is, the present invention includes both the high-load compressor 32 and the low-load compressor 31 , but the BOG compressor 30 for supplying fuel may be provided as the low-load compressor 31 .

The forced vaporizer 40 heats and vaporizes the liquefied gas discharged from the spray pump 11 . The forced vaporizer 40 can heat the liquefied gas above the boiling point by freely using commonly known fruits (glycol water, seawater, steam, etc.).

As mentioned above, the forced carburetor 40 is discharged from the liquefied gas storage tank 10 by the spray pump 11 to the outside, and is liquefied by the boost pump 20 to the required pressure of the engine 100 . Gas can be delivered and heated.

A strainer 41 for filtering the liquefied gas may be provided upstream of the forced vaporizer 40 . The strainer 41 is a liquefied gas supply line (L2) that delivers liquefied gas from the spray pump 11 to the engine 100 via the boost pump 20, the forced carburetor 40, and the like, the forced carburetor 40. is provided upstream of

The liquefied gas vaporizer 70 to be described later also requires a strainer 41, but in this embodiment, fuel supply is performed using the spray pump 11, so the liquefied gas vaporizer 70 and the force in the spray pump 11 The liquefied gas flow is branched into the vaporizer 40 . At this time, since the strainer 41 is provided upstream of the branching point of the liquefied gas flow, the forced vaporizer 40 and the liquefied gas vaporizer 70 may share one strainer 41 .

Specifically, upstream of the forced vaporizer 40 in the liquefied gas supply line (L2), the liquefied gas delivery line (L4) for delivering the liquefied gas discharged from the spray pump 11 to the liquefied gas vaporizer 70 is branched. can At this time, the liquefied gas supply line (L2) and the liquefied gas delivery line (L4) are provided to be integrated from the spray pump 11 to the upstream of the boost pump 20 .

Therefore, the strainer 41 is provided in the part where the liquefied gas supply line (L2) and the liquefied gas delivery line (L4) are integrated, and all of the liquefied gas delivered to the forced vaporizer 40 and the liquefied gas vaporizer 70 can be filtered. may be arranged to do so.

That is, in this embodiment, there is no need to separately provide the strainer 41 for the forced vaporizer 40 and the strainer 41 for the liquefied gas vaporizer 70 .

The mist separator 50 separates the liquefied gas heated in the forced vaporizer 40 into gas-liquid. As described above, the engine 100 may be provided with a propulsion engine 110 and a power generation engine 120 having different or the same required pressure, and at least the power generation engine 120 is the engine 100 whose operating efficiency depends on the methane number. ) can be

Therefore, in the process of delivering the liquefied gas discharged by the spray pump 11 to the power generation engine 120, the mist separator 50 utilizes the boiling point difference to remove heavy hydrocarbons from the liquefied gas, and liquefied gas methane number can be adjusted.

To this end, the forced vaporizer 40 heats the liquefied gas to about -100 degrees below the boiling point of heavy hydrocarbons contained in the liquefied gas and above the boiling point of light carbon, and the liquefied gas introduced into the mist separator 50 is It may be made of liquid heavy hydrocarbons and gaseous light hydrocarbons to facilitate separation.

The gas heater 60 heats the gaseous liquefied gas separated in the mist separator 50 and delivers it to the BOG flow between the BOG compressor 30 and the engine 100 . In order to match the methane number in the mist separator 50 , the temperature of the liquefied gas heated by the forced vaporizer 40 may not reach the required temperature of the engine 100 .

Therefore, the gas heater 60 uses the non-limited heat medium as mentioned in the forced carburetor 40, and the liquefied gas (mainly light hydrocarbon) separated into the gas phase in the mist separator 50 is requested by the engine 100. It can be heated to temperature.

The liquefied gas heated by the gas heater 60 may be delivered downstream of the boil-off gas compressor 30 in the boil-off gas supply line L1. That is, the liquefied gas delivered along the liquefied gas supply line L2 via the spray pump 11 , the boost pump 20 , the forced vaporizer 40 , the mist separator 50 and the gas heater 60 is boil-off gas. It may be combined with the boil-off gas discharged from the compressor 30 and supplied to the engine 100 .

The liquefied gas vaporizer 70 is provided for gassing-up. Specifically, the liquefied gas vaporizer 70 heats and injects the liquefied gas into the liquefied gas storage tank 10 in a state in which the inert gas is filled before loading, so that the gasing-up that replaces the inert gas with the liquefied gas can be implemented.

In order to load the liquefied gas into the liquefied gas storage tank 10, drying air is blown to remove moisture inside the liquefied gas storage tank 10, and an inert gas (nitrogen, etc.) is put into the liquefied gas storage tank (10) In order to remove the inerting that removes the explosive gas inside, the carbon dioxide contained in the inert gas (fear of freezing when it meets the liquefied gas), etc., a relatively warm gaseous liquefied gas is injected and the inside of the liquefied gas storage tank 10 is brought into a cargo atmosphere Gassing-up to replace, cool-down to suppress the generation of boil-off gas during loading by cooling the inside of the liquefied gas storage tank 10, and loading to fill the liquefied gas.

At this time, for gasing-up, this embodiment uses the liquefied gas vaporizer 70 to heat the liquefied gas storage tank 10 (spray pump 11) or the liquefied gas delivered from the outside to the liquefied gas storage tank ( 10) can be injected.

For reference, when emptying the liquefied gas storage tank 10, unloading, warming-up to vaporize all the liquid in the liquefied gas storage tank 10 by injecting warm liquefied gas, inerting to inject inert gas, and maintenance are required In this case, a step such as aerating by injecting oxygen-containing air may be performed to allow human entry.

The liquefied gas vaporizer 70 may receive liquefied gas from the spray pump 11 for gasing-up, or increase of the internal pressure of the liquefied gas storage tank 10 . As the liquefied gas storage tank 10 in the liquefied gas vaporizer 70, a gasing-up line L3 in which the liquefied gas heated in the liquefied gas vaporizer 70 flows into the liquefied gas storage tank 10 may be provided, In addition, from the spray pump 11 to the liquefied gas vaporizer 70, a liquefied gas delivery line L4 may be provided.

The liquefied gas delivery line (L4) and the gasing-up line (L3) increase the internal pressure of the liquefied gas storage tank 10 by heating and injecting the liquefied gas into the liquefied gas storage tank 10 in a state where the liquefied gas is filled ( can be used to facilitate unloading).

As such, in the present embodiment, it is possible to supply fuel to the engine 100 using the conventional spray pump 11 without a separate fuel pump, thereby simplifying the configuration and greatly reducing operating costs. In particular, through the omission of the configuration installed in the liquefied gas storage tank 10, it is possible to innovatively reduce the maintenance cost.

4 is a conceptual diagram of a gas processing system according to a second embodiment of the present invention.

Hereinafter, the present embodiment will be mainly described on the points that are different from the previous embodiment, and the parts omitted from the description will be replaced with the previous content. This is also the case in other embodiments below.

Referring to FIG. 4 , the gas processing system 1 according to the second exemplary embodiment of the present invention provides liquefied gas to the engine 100 using a pump such as a spray pump 11 , a cargo pump 12 , or a fuel pump. can supply Of course, when the pump provided in the liquefied gas storage tank 10 is the spray pump 11, the boost pump 20 shown in FIG. 1 can be applied to this embodiment as well.

In this embodiment, the liquefied gas is supplied to the engine 100 through the pump, the strainer 41, the forced carburetor 40, and the mist separator 50, but the gaseous liquefied gas separated from the mist separator 50 is It may be delivered upstream of the boil-off gas compressor 30 in the boil-off gas supply line (L1).

That is, in the present embodiment, the mist separator 50 may separate the liquefied gas heated in the forced vaporizer 40 into gas-liquid and deliver it to the boil-off gas compressor 30 . At this time, the main liquefied gas supply line (L21a) so that the liquefied gas discharged from the pump is transferred from the boil-off gas supply line (L1) to the upstream of the boil-off gas compressor 30 via the forced vaporizer 40 and the mist separator 50 this is provided

In this case, since the liquefied gas that has passed through the forced vaporizer 40 and the mist separator 50 may be compressed by the boil-off gas compressor 30 , the boost pump 20 may be omitted.

In particular, this embodiment is characterized in that the liquefied gas vaporizer 70 provided for gasing-up can be utilized for fuel supply. Specifically, the pump may supply liquefied gas to the liquefied gas vaporizer 70 , and the liquefied gas vaporizer 70 may heat the liquefied gas delivered from the pump and supply it to the engine 100 .

However, when using the liquefied gas vaporizer 70, it may be a case in which it is difficult to use the forced vaporizer 40. That is, the liquefied gas vaporizer 70 is, for example, depending on the operating state of the forced vaporizer 40, due to the operation stop of the forced vaporizer 40, the occurrence of a problem, etc. When it is difficult to supply the liquefied gas through the forced vaporizer 40 The liquefied gas may be supplied to the engine 100 .

At this time, the pump may pressurize the liquefied gas according to the required pressure of the engine 100 and the like, and the liquefied gas discharged from the liquefied gas vaporizer 70 is not upstream of the BOG compressor 30 , but the BOG compressor 30 . can be transmitted downstream of

In this case, the auxiliary liquefied gas supply line L22a may be provided so that the liquefied gas heated in the liquefied gas vaporizer 70 is transferred from the boil-off gas supply line L1 to the downstream of the boil-off gas compressor 30 .

When a problem occurs in the forced carburetor 40 , this embodiment can be used to ensure the operation of at least the propulsion engine 110 , so the liquefied gas vaporized in the liquefied gas vaporizer 70 is discharged from the boil-off gas compressor 30 . It may be combined with the boil-off gas to be introduced into the propulsion engine 110 .

However, the liquefied gas passing only the pump and the liquefied gas vaporizer 70 may not be sufficient for the methane number to be used in the power generation engine 120 .

Therefore, in this embodiment, the BOG supply line L1 is branched into the propulsion engine 110 and the power generation engine 120, respectively, and the auxiliary liquefied gas supply line L22a is connected downstream of the BOG compressor 30. It can be branched from the upstream of the point to be connected to the power generation engine 120 .

When liquefied gas is supplied through the main liquefied gas supply line (L21a), gas-liquid separation is performed by the mist separator 50, so that the methane number can be suitably matched to the power generation engine 120 .

On the other hand, the liquefied gas vaporizer 70 heats the liquefied gas and delivers it to the downstream of the boil-off gas compressor 30, but in the auxiliary liquefied gas supply line L22a, the liquefied gas heated in the liquefied gas vaporizer 70 is transferred to a separate gas-liquid Since it is delivered to the boil-off gas supply line L1 without separation, the liquefied gas passing through the liquefied gas vaporizer 70 may not have a methane number suitable for the power generation engine 120 .

Therefore, in order to ensure the operation efficiency of the power generation engine 120, in this embodiment, the BOG compressed in the BOG compressor 30 is upstream from the junction of the liquefied gas via the liquefied gas vaporizer 70 to the power generation engine ( 120) can be branched toward.

That is, with respect to the fuel consumed by the power generation engine 120 , in the case of boil-off gas, it does not contain heavy hydrocarbons when it is already generated in the liquefied gas storage tank 10 , so there is no problem in consumption because there is no methane number problem. However, in the case of liquefied gas, only the liquefied gas passing through the mist separator 50 is consumed by the power generation engine 120, but the liquefied gas passing through the liquefied gas vaporizer 70 is not the power generation engine 120 but the propulsion engine 110 It can be transmitted only to

As described above, in this embodiment, in the system in which the liquefied gas passing through the forced vaporizer 40 and the mist separator 50 is introduced into the boil-off gas compressor 30, a problem occurs in the operation of the forced vaporizer 40 In order to do this, the supply of liquefied gas is ensured by using the liquefied gas vaporizer 70, but the liquefied gas passing through the liquefied gas vaporizer 70 is not introduced into the power generation engine 120 sensitive to methane number, so that the engine 100 ) to ensure stable operation.

5 is a conceptual diagram of a gas processing system according to a third embodiment of the present invention.

Referring to FIG. 5 , in the gas treatment system 1 according to the third embodiment of the present invention, the mist separator 50 downstream of the forced vaporizer 40 may be omitted. Instead, in this case, in preparation for the methane number of the liquefied gas discharged from the forced carburetor 40 not being suitable for the power generation engine 120, the main liquefied gas supply line L21a in which the forced carburetor 40 is provided is supplied with boil-off gas. It may be connected downstream of a branching point from the line L1 to the power generation engine 120 .

That is, the boil-off gas compressed in the boil-off gas compressor 30 may be branched toward the power generation engine 120 from the point at which the liquefied gas passing through the forced vaporizer 40 joins. Accordingly, BOG having a suitable methane number may be introduced into the power generation engine 120 .

That is, the liquefied gas stored in the liquefied gas storage tank 10 may be supplied only to the propulsion engine 110 among the propulsion engine 110 and the power generation engine 120 through the pump, the strainer 41 and the forced carburetor 40 . On the other hand, the BOG passing through the BOG compressor 30 and the liquefied gas passing through the liquefied gas vaporizer 70 may be supplied to the power generation engine 120 .

In this embodiment, the liquefied gas vaporizer 70, the liquefied gas delivery line (L4) and the gasing-up line (L3) are connected is similar to the previous embodiment, but the engine 100 in the liquefied gas vaporizer 70 There is a difference in that the mist separator 50 may be provided in the auxiliary liquefied gas supply line L22a connected to the direction.

That is, the liquefied gas may be changed to a state suitable for the methane number of the power generation engine 120 through the pump, the strainer 41, the liquefied gas vaporizer 70, and the mist separator 50, at this time passing through the mist separator 50 The liquefied gas may be introduced into the boil-off gas compressor 30 through the auxiliary liquefied gas supply line L22a.

In summary, liquefied gas and BOG passed through the BOG compressor 30 may be introduced into the propulsion engine 110 without additional gas-liquid separation while passing through the forced carburetor 40 , and the power generation engine 120 . ), boil-off gas and liquefied gas passing through the liquefied gas vaporizer 70 and the mist separator 50 may be introduced.

In this case, the present embodiment is provided so that the liquefied gas vaporizer 70 can back up the forced vaporizer 40 as in the previous embodiment. Therefore, when a problem occurs in the operation of the forced vaporizer 40 , the liquefied gas may be supplied to the propulsion engine 110 through the liquefied gas vaporizer 70 , the mist separator 50 , and the boil-off gas compressor 30 .

As such, in this embodiment, when supplying the liquefied gas using the forced vaporizer 40, the liquefied gas joins the downstream of the branching point to the power generation engine 120 in the flow of the boil-off gas, so that the boil-off gas having a high methane number, etc. It sends to the power generation engine 120, and sends liquefied gas with a low methane number to the propulsion engine 110 to prevent deterioration of the engine 100, and a mist separator 50 and a gas heater 60 downstream of the forced carburetor 40. etc. can be omitted.

6 is a conceptual diagram of a gas processing system according to a fourth embodiment of the present invention.

Referring to FIG. 6 , the gas processing system 1 according to the fourth embodiment of the present invention includes a liquefied gas pump, a strainer 41 , a forced vaporizer 40 , a mist separator 50 , and a gas heater 60 . It may be supplied to the propulsion engine 110 through the.

At this time, a main liquefied gas supply line L21b passing through the forced vaporizer 40 , the mist separator 50 , and the gas heater 60 may be provided.

In addition, in this embodiment, the main liquefied gas supply line (L21b) can deliver liquefied gas to the downstream of the boil-off gas compressor 30 from the boil-off gas supply line (L1) through the mist separator 50 and the gas heater 60. There, it may further include an auxiliary liquefied gas supply line (L22b) so that the gaseous liquefied gas separated from the mist separator 50 is transferred from the boil-off gas supply line (L1) to the upstream of the boil-off gas compressor (30).

In this embodiment, the gas heater 60 heats the gaseous liquefied gas separated in the mist separator 50 and delivers it to the downstream of the BOG compressor 30 along the main liquefied gas supply line L21b.

In addition, in this embodiment, in order to prepare for a case in which a problem occurs in the operation of the gas heater 60 , the mist separator 50 supplies gaseous liquefied gas to the auxiliary liquefied gas supply line according to the operating state of the gas heater 60 . It may be delivered to the upstream of the boil-off gas compressor 30 along (L22b).

Therefore, the main liquefied gas supply line (L21b) is the liquefied gas discharged from the pump via the forced vaporizer 40, the mist separator 50 and the gas heater 60 in the boil-off gas supply line (L1) in the boil-off gas compressor 30 ), on the other hand, the auxiliary liquefied gas supply line (L22b) can deliver the gaseous liquefied gas separated from the mist separator 50 to the upstream of the boil-off gas compressor 30 in the boil-off gas supply line (L1). .

Since the liquefied gas delivered through the auxiliary liquefied gas delivery line L4 has passed through the mist separator 50, there is no problem with the methane number, but it may not reach the required temperature of the engine 100, so this embodiment is a boil-off gas The compression heat of the compressor 30 may be utilized as a backup of the gas heater 60 .

However, the BOG compressor 30 may be controlled to vary the load according to the flow of the liquefied gas of the main liquefied gas supply line L21b or the auxiliary liquefied gas supply line L22b. This is because the liquefied gas in the main liquefied gas supply line (L21b) and the auxiliary liquefied gas supply line (L22b) may have a different temperature but the same pressure.

Alternatively, the BOG compressor 30 varies the load so that the discharge pressure is adjusted to the required pressure of the engine 100 and the compression heat is generated differently, and the discharged BOG is applied to the upstream or intermediate stage of the BOG compressor 30 . By returning to , the discharge temperature can be adjusted to the required temperature of the engine 100 .

In addition, this embodiment, similar to the previous embodiment, the liquefied gas vaporizer 70 may be provided to back up the forced vaporizer 40, of course. In this case, the liquefied gas vaporizer 70 may heat the liquefied gas delivered from the pump according to the operating state of the forced vaporizer 40 and supply it to the downstream of the boil-off gas compressor 30 .

However, since the liquefied gas passing through the liquefied gas vaporizer 70 does not have enough methane unless it passes through the mist separator 50 , the boil-off gas compressed in the boil-off gas compressor 30 is branched to the power generation engine 120 . By joining the downstream of the, it can be prevented from flowing into the power generation engine (120).

In this case, a second auxiliary liquefied gas supply line L23 extending from the liquefied gas vaporizer 70 and connected downstream of the boil-off gas compressor 30 from the boil-off gas supply line L1 may be provided, and the second auxiliary liquefaction The gas supply line L23 delivers the liquefied gas heated in the liquefied gas vaporizer 70 to the boil-off gas supply line L1 without separate gas-liquid separation. At this time, the boil-off gas supply line (L1) is branched from the upstream of the point where the second auxiliary liquefied gas supply line (L23) is connected in the downstream of the boil-off gas compressor 30 and is connected to the power generation engine 120, in the previous embodiment. similar to

As such, in this embodiment, in order to prepare for an operation error of the gas heater 60 , the gaseous liquefied gas separated from the mist separator 50 is supplied to the engine 100 through the downstream of the boil-off gas compressor 30 , or Alternatively, when it is difficult to pass through the gas heater 60, it is heated via the boil-off gas compressor 30 and supplied to the engine 100, thereby ensuring the reliability of the system operation.

7 and 8 are conceptual views of a gas processing system according to a fifth embodiment of the present invention.

7 and 8 , the gas processing system 1 according to the fifth embodiment of the present invention includes a liquefied gas vaporizer 70 and a boil-off gas compressor 30 . As described above, the liquefied gas vaporizer 70 is provided for gassing-up as described above. Before loading, the liquefied gas is heated and injected into the liquefied gas storage tank 10 filled with inert gas to replace the inert gas with liquefied gas. can do.

The BOG compressor 30 of this embodiment compresses BOG generated in the liquefied gas storage tank 10 in which the liquefied gas remains after unloading by the cargo pump 12 and injects it into the liquefied gas storage tank 10 . Thus, the residual liquefied gas can be vaporized. That is, the boil-off gas compressor 30 may have a configuration provided for warm-up.

The BOG compressor 30 in the above-described embodiment may be a low-load compressor 31 for supplying fuel, and the BOG compressor 30 of this embodiment may be provided as a high-load compressor 32 .

For warm-up, it is necessary to inject warm liquefied gas into the liquefied gas storage tank 10 . At this time, the boil-off gas generated from the liquefied gas remaining in the liquefied gas storage tank 10 may be used.

Specifically, the boil-off gas in the liquefied gas storage tank 10 is compressed in the boil-off gas compressor 30 and returned to the liquefied gas storage tank 10 . At this time, the BOG compressed in the BOG compressor 30 may be introduced into the liquefied gas storage tank 10 through the warm-up line L5.

In particular, this embodiment may use the liquefied gas vaporizer 70 for effective warm-up. That is, the BOG compressed in the BOG compressor 30 and injected into the liquefied gas storage tank 10 is provided to pass through the liquefied gas vaporizer 70, and the liquefied gas vaporizer 70 is compressed by the BOG compressor 30. The boil-off gas may be heated and delivered to the liquefied gas storage tank 10 .

Therefore, the liquefied gas vaporizer 70 of this embodiment can be used for gasing-up and warm-up. However, when used for gasing-up, liquid liquefied gas flows into the liquefied gas vaporizer 70 from the outside (such as a gas source or other liquefied gas storage tank 10) and is heated to a gaseous phase and then the gasing-up line (L3) It can be injected into the liquefied gas storage tank 10 through the liquefied gas storage tank 10, and when used for warm-up, vaporized boil-off gas is introduced into the liquefied gas vaporizer 70 and heated and then liquefied through the warm-up line L5. It may be injected into the gas storage tank 10 .

That is, the liquefied gas vaporizer 70 may have one inlet through which liquefied gas or BOG is selectively introduced, and one outlet through which vaporized liquefied gas or heated BOG is selectively discharged. In addition, the gasing-up line (L3) and the warm-up line (L5) are provided to share the liquefied gas vaporizer (70).

In addition, bypass lines L60 and L61 provided to bypass the liquefied gas vaporizer 70 may be provided. The bypass lines L60 and L61 include a first bypass line L60 in which liquefied gas flows and a first bypass valve V60 of a first specification is provided, and a second bypass line L60 in which boil-off gas flows and is different from the first specification. It may include a second bypass line L61 provided with a second bypass valve V61 of the specification.

Since the flow amount of the liquefied gas for the gasing-up may be relatively larger than the flow amount of the boil-off gas for the warm-up, the bypass flow rate may also be large. Accordingly, the first dimension may be set to handle a larger flow rate than the second dimension.

The inert gas displaced by the liquefied gas in the gasing-up process and discharged from the liquefied gas storage tank 10 may be discharged to the outside through the vent mast 80 . In addition, at least a portion of the boil-off gas discharged from the liquefied gas storage tank 10 in the warm-up process may be discharged to the outside through the vent mast 80 .

As such, in the present embodiment, the vaporizer for gasing-up and the heater for warm-up are implemented as one liquefied gas vaporizer 70, thereby simplifying the system and significantly reducing investment and operating costs.

9 is a conceptual diagram of a gas processing system according to a sixth embodiment of the present invention.

Referring to FIG. 9 , the gas processing system 1 according to the sixth embodiment of the present invention is based on the fuel supply configurations of FIGS. 4 to 6 , but there is a change in the boil-off gas supply line L1 . For convenience, FIG. 9 is drawn based on FIG. 5, but the configuration described below may be grafted to FIGS. 4 and 6, of course.

In this embodiment, the boil-off gas supply line L1 allows the boil-off gas discharged from the liquefied gas storage tank 10 to be delivered to the engine 100 via the boil-off gas compressor 30 . In particular, the BOG supply line L1 includes a BOG header L10, a BOG inlet L11, and a BOG bypass section L12.

The BOG header L10, as briefly mentioned in the first embodiment, is a section in which BOG discharged from the plurality of liquefied gas storage tanks 10 is collected, and may also be referred to as a vapor main or the like.

The BOG header L10 may be a space in which BOG discharged from the liquefied gas storage tank 10 temporarily stays, and BOG introduced into the BOG header L10 is evaporated through the BOG supply line L1. may be delivered to the gas compressor 30 .

However, in this embodiment, instead of the BOG flowing into the BOG header L10 being directly delivered to the BOG compressor 30, the internal space of the liquefied gas storage tank 10 is reduced through the BOG inlet L11. It can be arranged to pass through.

The boil-off gas inlet (L11) connects the boil-off gas header (L10) and the boil-off gas compressor (30), the boil-off gas flowing into the boil-off gas header (L10) of the liquefied gas stored in the liquid gas storage tank (10). It is provided to be delivered to the boil-off gas compressor 30 after passing through the inside.

Through this, the boil-off gas inlet (L11) allows the boil-off gas to exchange heat with the liquefied gas in the liquefied gas storage tank 10 and then transfer it to the boil-off gas compressor 30, thereby lowering the temperature of the boil-off gas (reducing the volume). It is possible to improve the performance of the boil-off gas compressor (30).

The BOG compressor 30 shows a performance sensitive to the density of BOG. If the BOG temperature is high and the density is lowered, the performance of the BOG compressor 30 may be rapidly reduced. Therefore, in this embodiment, the BOG is discharged from the liquefied gas storage tank 10 and then cooled by the liquefied gas while passing through the liquefied gas and then transferred to the BOG compressor 30, performance improvement can be realized.

Specifically, the boil-off gas inlet (L11) is provided in the form of a pipe without an opening so that the boil-off gas is heat-exchanged by the liquefied gas but not mixed, passes through the inside of the liquid gas stored in the liquid gas storage tank 10, and then stores the liquid gas. It extends to the outside of the tank (10).

In addition, the boil-off gas inlet (L11) is extended from the boil-off gas header (L10) in the form of a coil circulating a certain part in the lower portion of the liquefied gas storage tank (10), and then the outside of the liquefied gas storage tank (10) may be extended to deliver the boil-off gas to the boil-off gas compressor 30 .

The boil-off gas inlet (L11), in consideration of the level of the liquefied gas, in consideration of the level of the liquefied gas even if the liquefied gas stored in the liquefied gas storage tank 10 is consumed as fuel, the liquefied gas storage tank 10 lower By passing through, the boil-off gas may be provided to be cooled by the liquefied gas, and the form is not particularly limited.

A blower 33 may be provided at the boil-off gas inlet L11. In order for the BOG discharged from the liquefied gas storage tank 10 to be smoothly transferred to the BOG compressor 30 after passing through the liquefied gas storage tank 10, the blower 33 is a BOG inlet L11. ) may be provided upstream of the liquefied gas storage tank 10 to forcibly flow the boil-off gas.

Of course, instead of the blower 33 or together with the blower 33, any configuration that can force the flow of boil-off gas, such as an ejector, may be used.

The BOG bypass unit L12 bypasses the BOG inlet L11 in the BOG header L10 to deliver BOG to the BOG compressor 30 . When the temperature of the boil-off gas discharged from the liquefied gas storage tank 10 is low, the internal pressure of the liquefied gas storage tank 10 is high, or the liquefied gas storage amount is not sufficient, the boil-off gas is stored in the liquefied gas storage tank ( 10) In a case in which it can be determined that passing through is inefficient, the BOG bypass unit L12 is the BOG discharged from the liquefied gas storage tank 10 without passing through the BOG inlet L11. It can be delivered to the compressor (30).

The boil-off gas bypass unit L12 can control the valve to control whether the bypass or bypass flow rate is bypassed, and the bypass conditions include situations where, in addition to the above-described examples, cooling of the boil-off gas is unnecessary or heating of liquefied gas must be suppressed can

As described above, in the present embodiment, the compression performance of the BOG compressor 30 can be improved by allowing the BOG to exchange heat with the liquefied gas stored in the liquefied gas storage tank 10 before being delivered to the BOG compressor 30 . .

10 is a conceptual diagram of a gas processing system according to a seventh embodiment of the present invention.

Referring to FIG. 10 , the gas processing system 1 according to the seventh embodiment of the present invention will be described as based on FIG. 5 for convenience, similar to the sixth embodiment in FIG. 9 .

In this embodiment, the BOG compressor 30 and the engine 100 may be mechanically connected. Through this, the rotational force generated by the engine 100 may be utilized as a driving force of the boil-off gas compressor 30 .

Specifically, the engine 100 has an output unit 111 that outputs the rotational force generated by consuming gas. In this case, the output unit 111 may be an output gear that is connected to the shaft of the engine 100 and rotates, and may be, for example, a flywheel.

On the other hand, the boil-off gas compressor 30 includes a driving unit 34 that receives rotational force for compressing the boil-off gas. The BOG compressor 30 may be a centrifugal compressor or a screw-type compressor that compresses using a rotational force, and a reciprocating compressor may also be used if the configuration for converting the rotational force into a translational motion is premised.

In the BOG compressor 30 , the driving unit 34 is connected to the output unit 111 of the engine 100 . In this case, the driving unit 34 may be a rotating driving gear connected to the output gear through gear meshing. Accordingly, the boil-off gas is compressed by the rotational force of the driving gear.

At this time, between the output gear and the driving gear, a connecting gear 341 for interconnecting the two gears may be further provided. The connecting gear 341 may be used to control a rotation direction or RPM.

Of course, instead of a gear connection, a belt or chain connection can also be used. In this case, the output unit 111 of the engine 100 and the driving unit 34 of the boil-off gas compressor 30 may be connected to each other by a belt or a chain, and may be provided in the form of a pulley.

In the present embodiment, a plurality of engines 100 are provided, and the BOG compressor 30 may include a driving unit 34 connected to the output unit 111 of any one engine 100 .

At this time, the other engine 100 not connected to the BOG compressor 30 electrically transmits the rotational force to the BOG compressor 30 when the BOG compressor 30 is initially operated. That is, the other engine 100 may be the power generation engine 120 .

In addition, any one engine 100 connected to the BOG compressor 30 may mechanically transmit the rotational force to the BOG compressor 30 during normal operation of the BOG compressor 30 , and the other power generation engine 120 . Or it may be a propulsion engine (110).

In the present embodiment, the BOG compressor 30 connected to the engine 100 is configured to compress BOG for the operation of the engine 100 and supply it to the engine 100 . However, if a separate driving source is not used (of course, a separate driving source can be used in this embodiment), the BOG compressor 30 may not receive rotational force unless the engine 100 is operated.

Therefore, in the present embodiment, electricity is transmitted to the BOG compressor 30 using the power generation engine 120 operated with liquefied gas during initial operation to operate the BOG compressor 30, and the BOG compressor 30 is If the operation is carried out to a certain extent, the rotational force may be transmitted backwards through the other engine 100 receiving the BOG compressed by the BOG compressor 30 operating normally.

Of course, with respect to one engine 100, at the time of initial operation, the engine 100 operates with liquefied gas and delivers electricity to the boil-off gas compressor 30, and then enters normal operation, the engine 100 operates with boil-off gas And it will be possible to transmit the rotational force to the boil-off gas compressor (30).

As described above, in the present embodiment, the BOG compressor 30 is provided to be operated by the rotational force generated by the engine 100, so that the driving source for the operation of the BOG compressor 30 can be reduced or omitted.

It goes without saying that the present invention is not limited to the embodiments described above, and a combination of the above embodiments or a combination of at least one of the embodiments and a known technology may be included as another embodiment.

Although the present invention has been described in detail through specific examples, this is for the purpose of describing the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention. It will be clear that the transformation or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will become clear from the appended claims.

1: gas treatment system 10: liquefied gas storage tank
11: spray pump 12: cargo pump
20: boost pump 30: boil-off gas compressor
31: low load compressor 32: high load compressor
33: blower 34: drive unit
341: connected gear 40: forced carburetor
41: strainer 50: mist separator
60: gas heater 70: liquefied gas vaporizer
80: vent mast 100: engine
110: propulsion engine 120: power generation engine
111: output unit L1: boil-off gas supply line
L10: BOG header L11: BOG inlet
L12: BOG bypass L2: Liquefied gas supply line
L20: bypass line L21a, L21b: main liquefied gas supply line
L22a, L22b: auxiliary liquefied gas supply line L23: second auxiliary liquefied gas supply line
L3: Gasing-up line L4: Liquefied gas delivery line
L5: Warm-up line L6: Bypass line
L60: first bypass line L61: second bypass line
V20: bypass valve V60: first bypass valve
V61: second bypass valve

Claims (9)

a liquefied gas storage tank that stores liquefied gas therein, and is provided with a cargo pump for unloading liquefied gas;
a liquefied gas vaporizer provided for gassing-up by heating and injecting liquefied gas into the liquefied gas storage tank in a state filled with inert gas before loading; and
BOG compressor provided for warm-up for vaporizing residual liquefied gas by compressing BOG generated in the liquefied gas storage tank in a state where liquefied gas remains after unloading by the cargo pump and injecting it into the liquefied gas storage tank includes,
The liquefied gas vaporizer,
BOG compressed in the BOG compressor and injected into the liquefied gas storage tank is provided to pass through, and the BOG compressed in the BOG compressor is heated and delivered to the liquefied gas storage tank,
a gasing-up line in which the liquefied gas heated in the liquefied gas vaporizer is introduced into the liquefied gas storage tank; and
Further comprising a warm-up line through which the boil-off gas compressed by the boil-off gas compressor and heated in the liquefied gas vaporizer flows into the liquefied gas storage tank,
The gasing-up line and the warm-up line share the liquefied gas vaporizer,
A bypass line provided to bypass the liquefied gas vaporizer, a first bypass line in which liquefied gas flows and a first bypass valve of a first specification is provided, and a second specification in which boil-off gas flows and is different from the first specification Further comprising a second bypass line provided with a second bypass valve of
The second bypass line is used in the warm-up process, the first bypass line is used in the gasing-up process, and the first specification is set to handle a larger flow rate than the second specification. gas treatment system. According to claim 1, The liquefied gas vaporizer,
One inlet through which liquefied gas or boil-off gas is selectively introduced;
A gas treatment system, characterized in that it has one outlet through which vaporized liquefied gas or heated boil-off gas is selectively discharged. The method of claim 1,
Gasing-up gas treatment system, characterized in that it further comprises a vent mast for discharging the inert gas replaced by the liquefied gas to the outside. The method of claim 3, wherein the vent mast,
Gas treatment system, characterized in that for discharging at least a portion of the boil-off gas discharged from the liquefied gas storage tank in the warm-up to the outside. According to claim 1, wherein the boil-off gas compressor, a high-load compressor,
The gas treatment system according to claim 1, further comprising a low-load compressor that compresses the boil-off gas generated in the liquefied gas storage tank and supplies it to the engine. delete delete delete A ship having the gas treatment system according to any one of claims 1 to 5.

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