KR102552735B1 - liquefied gas treatment system and ship having the same - Google Patents

Abstract

The present invention relates to a gas processing system and a ship including the same, comprising: a liquefied gas storage tank having a pump for storing liquefied gas therein and discharging the liquefied gas; a boil-off gas compressor that compresses boil-off gas generated in the liquefied gas storage tank and supplies it to an engine; And a forced vaporizer for heating the liquefied gas discharged from the pump and transferring it downstream of the boil-off gas compressor, wherein the engine includes a propulsion engine and a power generation engine whose operating efficiency depends on the methane number, wherein the boil-off gas The boil-off gas compressed by the compressor is branched toward the power generation engine upstream of the junction of the liquefied gas passing through the liquefied gas vaporizer.

Description

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

The present invention relates to a gas processing system and a vessel including the same.

A ship is a means of transportation that carries a large amount of minerals, crude oil, natural gas, or thousands of containers and navigates the ocean. move through

Such a ship generates thrust by driving an engine or a gas turbine. At this time, the engine uses oil fuel such as gasoline or diesel to move a 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 together with compressed air, and generates power by rotating turbine blades through the temperature/pressure of the combustion air to transmit power to the propeller.

Recently, however, an LNG fuel supply method has been used in which LNG carriers carrying liquefied natural gas, a type of liquefied gas, use LNG as fuel to drive demand such as engines or turbines, and LNG is a clean fuel. And because the reserves are also richer than oil, the method of using LNG as a fuel for demand is applied to ships other than LNG carriers.

However, compared to the conventional case of using oil fuel such as diesel, there are still many problems to be solved in the case of using LNG, a gas fuel, so technology to supply to customers in ships using LNG, a clean fuel. Ongoing research and development is being carried out.

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 provide a backup structure to prepare for operational errors in supplying liquefied gas or the like as engine fuel. By being equipped, it is to provide a stable and highly reliable gas treatment system and a vessel including the same.

A gas processing system according to an aspect of the present invention includes a liquefied gas storage tank storing liquefied gas therein and having a pump for discharging the liquefied gas; a boil-off gas compressor that compresses boil-off gas generated in the liquefied gas storage tank and supplies it to an engine; And a forced vaporizer for heating the liquefied gas discharged from the pump and transferring it downstream of the boil-off gas compressor, wherein the engine includes a propulsion engine and a power generation engine whose operating efficiency depends on the methane number, wherein the boil-off gas The boil-off gas compressed by the compressor is branched toward the power generation engine upstream of the junction of the liquefied gas passing through the liquefied gas vaporizer.

Specifically, the boil-off gas supply line through which the boil-off gas discharged from the liquefied gas storage tank is delivered to the engine via the boil-off gas compressor; And a main liquefied gas supply line through which the liquefied gas discharged from the pump is transferred from the boil-off gas supply line to the downstream of the boil-off gas compressor via the forced vaporizer, the boil-off gas supply line, the boil-off gas The main liquefied gas supply line may be branched from upstream of the point where the main liquefied gas supply line is connected downstream of the compressor and connected to the power generation engine.

Specifically, the main liquefied gas supply line may transfer the liquefied gas heated in the forced vaporizer to the boil-off gas supply line without separate gas-liquid separation.

Specifically, liquefied gas and boil-off gas supplied to the propulsion engine may have relatively low methane numbers compared to boil-off gas supplied to the power generation engine.

Specifically, the methane number of the liquefied gas discharged from the forced vaporizer may deviate from the methane number suitable for the operation of the power generation engine.

Specifically, a liquefied gas vaporizer provided for gassing-up by heating and injecting liquefied gas into the liquefied gas storage tank filled with inert gas before loading to replace the inert gas with liquefied gas; And a gassing-up line through which the liquefied gas heated in the liquefied gas vaporizer flows into the liquefied gas storage tank, wherein the pump supplies liquefied gas to the liquefied gas vaporizer, and the liquefied gas vaporizer, Depending on the operating state of the forced vaporizer, the liquefied gas delivered from the pump may be heated and supplied to the boil-off gas supply line.

A ship according to one aspect of the present invention has the gas treatment system.

The gas processing system according to the present invention and a ship including the same can significantly reduce system construction costs and operating costs by omitting a fuel pump or providing a backup of a forced vaporizer or gas heater. .

1 to 3 are conceptual diagrams of a gas processing system according to a first embodiment of the present invention.
4 is a conceptual diagram of a gas treatment 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 treatment system according to a fourth embodiment of the present invention.
7 and 8 are conceptual diagrams 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 treatment system according to a seventh embodiment of the present invention.

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 adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description 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 can be located in the ocean, such as commercial ships, offshore plants, and offshore structures).

Hereinafter, in the present specification, liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc., and boil-off gas (BOG) is natural vaporization or It may refer to forcedly vaporized liquefied gas. However, boil-off gas may be used in the sense of including liquefied boil-off gas as well as gaseous boil-off gas.

In addition, liquefied gas may be used as a term encompassing all of the liquefied gas, liquid state, naturally vaporized or forcibly vaporized gas state, etc., but boil-off gas is a term referring to naturally vaporized gas in the liquefied gas storage tank 10. Note that it can be used as

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

1 to 3, the gas processing 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, 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 in a liquid phase, the liquefied gas storage tank 10 has a heat insulating wall structure that implements a certain or more thermal insulation performance. can have

For example, the liquefied gas storage tank 10 may be provided in a conventional 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 land, 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 may implement cool-down through the spray nozzle by circulating the liquefied gas toward the spray nozzle.

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

In addition, the spray pump 11 may assist loading and unloading by increasing the internal pressure of the liquefied gas storage tank 10 by utilizing the liquefied gas vaporizer 70 to be described later.

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 treatment. However, in this specification, the spray pump 11 may be replaced with a stripping pump used as a general name in the field of liquefied gas treatment.

In this embodiment, the liquefied gas stored in the liquefied gas storage tank 10 can be used as fuel for the engine 100, where the engine 100 includes a propulsion engine 110 for propulsion of a ship, and power generation for power generation. It can be divided into 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 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 as 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, pumps (cargo pump 12, spray pump 11) required for processing the liquefied gas when storing the liquefied gas as cargo , stripping pump, etc.), a fuel pump should be provided.

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 cargo. The liquid level required for operation is relatively high.

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

In order to solve this problem, the present embodiment uses the spray pump 11 itself as a fuel pump and may not have a separate fuel pump.

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

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

Referring first to Figure 2, the liquefied gas discharged by the spray pump 11 is delivered to the engine 100 side through the liquefied gas supply line (L2), the bypass line (L20) in the liquefied gas supply line (L2) this can be provided.

The bypass line (L20) is a line branched downstream of the spray pump 11 and returned to the inside of 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 part 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, a minimum flow must be ensured so that no gas is introduced or generated in the spray pump 11, so that cavitation can be suppressed.

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 matched, causing problems with the operation of the boost pump 20, and transmitted to the engine 100 side. The pressure of the liquefied gas may be made improper.

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

To this end, 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), the supply pressure of the spray pump 11 can be controlled to a certain 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 based on the load value of the spray pump 11 and the pressure value of the discharge end of the spray pump 11, the first for ensuring the minimum flow rate of the spray pump 11 The opening degree may be controlled using the second opening degree value for limiting the maximum pressure of the liquefied gas discharged from the spray pump 11 and the opening degree value.

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

Therefore, in the case of FIG. 3, when compared to FIG. 2, cost reduction can be achieved by eliminating the discharge valve due to improvement in logic.

It should be noted that the above valve control information 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 supplying fuel, but is provided for spraying for internal cool-down of the liquefied gas storage tank 10, so the discharge pressure is lower than that of the engine 100. .

Accordingly, 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, the sleep type Although not submerged, the types (centrifugal type, screw type, reciprocating type, etc.) of the boost pump 20 and the spray pump 11 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 vaporizer 40 vaporizes the pressurized liquefied gas to correspond to the required pressure of the engine 100, there may be no means for additionally increasing the pressure between the forced vaporizer 40 and the engine 100. .

The boil-off gas compressor 30 compresses the boil-off gas 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 type is not particularly limited.

The boil-off gas compressor 30 may be provided on the boil-off gas supply line L1 so that boil-off gas discharged from the liquefied gas storage tank 10 is transferred 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 vaporizer 40, but 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 the 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 evaporation gas discharged from the liquefied gas storage tank 10 is collected by the vapor header (L10) (vapor header, vapor main), The boil-off gas may be delivered to the 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 the DFDE, the discharge pressure of the boil-off gas compressor 30 (and the boost pump 20) is 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 and connected from the upstream of the propulsion engine 110, and the boil-off gas / liquefied gas with slightly lowered pressure is introduced through a pressure control valve (not shown). It 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 large amount of boil-off gas generated in the liquefied gas storage tank 10 when loading the liquefied gas into the liquefied gas storage tank 10 as a fuel source. As a compressor that compresses to return to, a high-load compressor 32 (High-Duty Compressor) is essentially provided.

In this regard, in the case of the boil-off gas compressor 30 described above, as it delivers a relatively small amount of boil-off gas generated in the liquefied gas storage tank 10 during operation to the engine 100, 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 boil-off gas compressor 30 for fuel supply may be provided as a 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 liquefied gas to a boiling point or higher by freely using commonly known heat (glycol water, seawater, steam, etc.).

As mentioned above, the forced vaporizer 40 is discharged to the outside from the liquefied gas storage tank 10 by the spray pump 11, and liquefied by the boost pump 20 to the required pressure of the engine 100. It can receive gas and heat it.

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

The liquefied gas vaporizer 70, which will be described later, also requires a strainer 41, but since the fuel supply is performed using the spray pump 11 in this embodiment, the liquefied gas vaporizer 70 and the forced 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 integrated portion of the liquefied gas supply line (L2) and the liquefied gas delivery line (L4), the forced vaporizer 40 and the liquefied gas vaporizer 70 It is possible to filter all of the liquefied gas delivered can be arranged to do so.

That is, the present embodiment does not 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 and 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, but at least the power generation engine 120 is an engine 100 whose operating efficiency depends on ) 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 carbon from the liquefied gas, liquefied gas can match the methane number of

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

The gas heater 60 heats the gaseous liquefied gas separated by the mist separator 50 and transfers it to the boil-off gas stream between the boil-off gas 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, as mentioned in the forced vaporizer 40, uses the heat that is not limited, and the liquefied gas (mainly light hydrocarbons) separated from the mist separator 50 into the gaseous phase at the request of the engine 100 It can be heated up 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, the boil-off gas It can be supplied to the engine 100 by being joined with the boil-off gas discharged from the compressor 30 .

The liquefied gas vaporizer 70 is provided for gasing-up. Specifically, the liquefied gas vaporizer 70 heats and injects liquefied gas into the liquefied gas storage tank 10 filled with inert gas before loading, thereby replacing the inert gas with liquefied gas. Gasing-up can be implemented.

In order to load the liquefied gas into the liquefied gas storage tank 10, dry air is blown to remove moisture inside the liquefied gas storage tank 10, and inert gas (nitrogen, etc.) is added to the liquefied gas storage tank 10 Inerting to remove internal explosive gas, carbon dioxide included in inert gas (concern about freezing when meeting with liquefied gas), etc. It goes through 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, the present embodiment heats the liquefied gas delivered from the liquefied gas storage tank 10 (spray pump 11) or the outside using the liquefied gas vaporizer 70 to obtain a liquefied gas storage tank ( 10) can be injected.

For reference, when the liquefied gas storage tank 10 is emptied, 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, steps such as aerating injecting air containing oxygen may be performed to enable human entry.

The liquefied gas vaporizer 70 may be supplied with liquefied gas from the spray pump 11 for gassing-up or to increase the internal pressure of the liquefied gas storage tank 10 . From the liquefied gas vaporizer 70 to the liquefied gas storage tank 10, a gassing-up line L3 through which the liquefied gas heated in the liquefied gas vaporizer 70 flows into the liquefied gas storage tank 10 may be provided, In addition, a liquefied gas delivery line (L4) may be provided from the spray pump 11 to the liquefied gas vaporizer 70.

The liquefied gas delivery line L4 and the gassing-up line L3 heat and inject liquefied gas into the liquefied gas storage tank 10 filled with liquefied gas to increase the internal pressure of the liquefied gas storage tank 10 ( can be used to facilitate unloading).

In this way, since the present embodiment can supply fuel to the engine 100 using the existing spray pump 11 without having a separate fuel pump, the configuration can be simplified and operating costs can be greatly reduced. In particular, through omission of components installed in the liquefied gas storage tank 10, it is possible to innovatively reduce maintenance costs.

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

Hereinafter, the present embodiment will be described mainly in terms of differences compared to the previous embodiment, and parts omitted from explanation will be replaced with the previous contents. This is the same in other embodiments below.

Referring to FIG. 4 , the gas treatment system 1 according to the second embodiment of the present invention supplies liquefied gas to an engine 100 using a spray pump 11, a cargo pump 12, or a pump such as 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 via the pump, the strainer 41, the forced vaporizer 40, and the mist separator 50, but the gaseous liquefied gas separated from the mist separator 50 It can 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 and liquid and deliver it to the boil-off gas compressor 30. At this time, the main liquefied gas supply line (L21a) such 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 can 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 gassing-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, in the case of using the liquefied gas vaporizer 70, it may be a case where it is difficult to use the forced vaporizer 40. That is, the liquefied gas vaporizer 70 depends on the operating state of the forced vaporizer 40, for example, when the supply of liquefied gas through the forced vaporizer 40 is difficult due to stoppage of operation of the forced vaporizer 40, occurrence of problems, etc. Liquefied gas may be supplied to the engine 100 .

At this time, the pump can pressurize the liquefied gas according to the required pressure of the engine 100, etc., and the liquefied gas discharged from the liquefied gas vaporizer 70 is not upstream of the boil-off gas compressor 30, but the boil-off gas compressor 30 can be passed downstream of

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

Since this embodiment can be used to ensure the operation of at least the propulsion engine 110 when a problem occurs in the forced vaporizer 40, the liquefied gas vaporized in the liquefied gas vaporizer 70 is discharged from the boil-off gas compressor 30 It can be joined with the evaporation gas to be introduced into the propulsion engine (110).

However, the liquefied gas that has passed through only the pump and the liquefied gas vaporizer 70 may not have a methane number sufficient to be used in the power generation engine 120.

Therefore, in this embodiment, the boil-off gas supply line (L1) is branched to the propulsion engine 110 and the power generation engine 120, respectively, but the auxiliary liquefied gas supply line (L22a) is connected downstream of the boil-off gas 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 due to the mist separator 50, so that the methane number can be suitably adjusted 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 separated into 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 suitable methane number for the power generation engine (120).

Therefore, in order to ensure the operating efficiency of the power generation engine 120, the present embodiment is that the boil-off gas compressed in the boil-off gas compressor 30 is upstream of the junction of the liquefied gas via the liquefied gas vaporizer 70, 120).

That is, for the fuel consumed by the power generation engine 120, in the case of boil-off gas, since it contains almost no heavy hydrocarbons when it is already generated in the liquefied gas storage tank 10, there is no problem with methane number and consumption. 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 delivered only to

As such, this embodiment prepares for the case where a problem occurs in the operation of the forced vaporizer 40 in the system in which the liquefied gas that has passed through the forced vaporizer 40 and the mist separator 50 flows into the boil-off gas compressor 30. In order to do this, the liquefied gas vaporizer 70 is used to ensure the supply of liquefied gas, but the power generation engine 120, which is sensitive to methane number, is configured so that liquefied gas that has passed through the liquefied gas vaporizer 70 does not flow, and the engine 100 ) can be stably guaranteed.

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 case the methane number of the liquefied gas discharged from the forced vaporizer 40 is not suitable for the power generation engine 120, the main liquefied gas supply line L21a provided with the forced vaporizer 40 supplies boil-off gas It can be connected downstream of the branching point from the line (L1) to the power generation engine (120).

That is, the boil-off gas compressed by the boil-off gas compressor 30 may be branched toward the power generation engine 120 upstream from the point where the liquefied gas through the forced vaporizer 40 joins. Therefore, evaporation gas having a suitable methane number may flow 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 of the propulsion engine 110 and the power generation engine 120 via the pump, the strainer 41, and the forced vaporizer 40. On the other hand, to the power generation engine 120, the boil-off gas passed through the boil-off gas compressor 30 and the liquefied gas passed through the liquefied gas vaporizer 70 may be supplied.

In this embodiment, the liquefied gas vaporizer 70, the liquefied gas delivery line (L4) and the gassing-up line (L3) is 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 toward.

That is, the methane number can be changed to a state suitable for the power generation engine 120 through the liquefied gas, the pump, the strainer 41, the liquefied gas vaporizer 70, and the mist separator 50. At this time, 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 transmitted without additional gas-liquid separation while passing through the forced vaporizer 40 and boil-off gas through the boil-off gas compressor 30 may flow into the propulsion engine 110, and the power generation engine 120 ), boil-off gas and liquefied gas via the liquefied gas vaporizer 70 and the mist separator 50 may be introduced.

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

As described above, in this embodiment, when supplying liquefied gas using the forced vaporizer 40, liquefied gas is joined downstream of the branching point to the power generation engine 120 among the flow of boil-off gas, so that boil-off gas having a high methane number, etc. It is sent to the power generation engine 120 and liquefied gas having a low methane number is sent to the propulsion engine 110 to prevent performance degradation of the engine 100, and the mist separator 50 and gas heater 60 downstream of the forced vaporizer 40 etc. can be omitted.

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

Referring to FIG. 6, the gas treatment 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 can be supplied to the propulsion engine 110 via.

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 from the boil-off gas supply line (L1) to the downstream of the boil-off gas compressor 30 via the mist separator 50 and the gas heater 60. There is, the gaseous liquefied gas separated from the mist separator 50 may further include a secondary liquefied gas supply line (L22b) such that the gaseous liquefied gas is transferred upstream of the boil-off gas compressor 30 in the boil-off gas supply line (L1).

In this embodiment, the gas heater 60 heats the gaseous liquefied gas separated from the mist separator 50 and transfers it downstream of the boil-off gas compressor 30 along the main liquefied gas supply line L21b.

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

Therefore, the main liquefied gas supply line (L21b) passes the liquefied gas discharged from the pump through the forced vaporizer 40, the mist separator 50, and the gas heater 60 from the boil-off gas supply line (L1) to the boil-off gas compressor (30). ) Can be delivered to the downstream of, while 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) passes through the mist separator 50, there is no problem with the methane number, but since it may not reach the required temperature of the engine 100, this embodiment boils off gas The compression heat of the compressor 30 can be used as a backup for the gas heater 60.

However, the boil-off gas compressor 30 may be controlled to vary the load according to the liquefied gas flow 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 different temperatures but the same pressure.

Alternatively, the boil-off gas compressor 30 varies the load so that the discharge pressure matches the required pressure of the engine 100 and generates different compression heat, and the discharged boil-off gas is upstream or in the middle of the boil-off gas compressor 30 It is possible to adjust the discharge temperature to the required temperature of the engine 100 by returning to .

In addition, of course, in this embodiment, the liquefied gas vaporizer 70 may be provided to back up the forced vaporizer 40, similarly to the previous embodiment. 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 downstream of the boil-off gas compressor 30.

However, since the liquefied gas passed through the liquefied gas vaporizer 70 does not have a sufficient methane number unless it passes through the mist separator 50, the point at which the boil-off gas compressed in the boil-off gas compressor 30 branches 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 to the downstream of the boil-off gas compressor 30 in the boil-off gas supply line (L1) may be provided, and the second auxiliary liquefaction The gas supply line (L23) transfers 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 downstream of the boil-off gas compressor 30 and connected to the power generation engine 120, in the previous embodiment. similar to

As described above, in this embodiment, in order to prepare for an operating 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, reliability of system operation can be guaranteed by heating the boil-off gas through the compressor 30 and supplying it to the engine 100.

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

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

The boil-off gas compressor 30 of this embodiment compresses the boil-off gas 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 In this way, the residual liquefied gas can be vaporized. That is, the boil-off gas compressor 30 may be configured for warm-up.

The boil-off gas compressor 30 in the above-described embodiment may be a low load compressor 31 for fuel supply, and the boil-off gas compressor 30 of the present 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, 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 boil-off gas compressed by the boil-off gas compressor 30 may flow into the liquefied gas storage tank 10 through the warm-up line L5.

In particular, in this embodiment, for effective warm-up, a liquefied gas vaporizer 70 may be used. That is, the boil-off gas compressed in the boil-off gas 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 in the boil-off gas compressor 30. The boil-off gas can 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 gassing-up, liquid liquefied gas is introduced into the liquefied gas vaporizer 70 from the outside (such as a gas station or other liquefied gas storage tank 10), heated to a vapor phase, and then the gassing-up line (L3) It can be injected into the liquefied gas storage tank 10 through, and when used for warm-up, the vaporized vapor is introduced into the liquefied gas vaporizer 70, heated, and then liquefied through the warm-up line L5 It can be injected into the gas storage tank (10).

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

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

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

During the gassing-up process, the inert gas replaced by liquefied gas and discharged from the liquefied gas storage tank 10 may be discharged to the outside through the vent mast 80 . Also, during the warm-up process, at least a part of the evaporation gas discharged from the liquefied gas storage tank 10 may be discharged to the outside through the vent mast 80 .

As described above, in this 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 has 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 applied to FIG. 4 or FIG. 6 as a matter of course.

In this embodiment, the boil-off gas supply line (L1) is such that the boil-off gas discharged from the liquefied gas storage tank 10 is delivered to the engine 100 via the boil-off gas compressor 30. In particular, the boil-off gas supply line (L1) includes a boil-off gas header (L10), a boil-off gas inlet (L11), and a boil-off gas bypass portion (L12).

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

The evaporation gas header (L10) may be a space where the evaporation gas discharged from the liquefied gas storage tank 10 temporarily stays, and the evaporation gas introduced into the evaporation gas header (L10) evaporates through the evaporation gas supply line (L1). It can be delivered to the gas compressor (30).

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

The evaporation gas inlet (L11) connects the evaporation gas header (L10) and the evaporation gas compressor 30, and the evaporation gas flowing into the evaporation gas header (L10) is stored in the liquefied 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 heat-exchange with the liquefied gas in the liquefied gas storage tank 10 and then transfer to the boil-off gas compressor 30, thereby lowering the temperature of the boil-off gas (reducing the volume) Performance of the boil-off gas compressor 30 can be improved.

The boil-off gas compressor 30 shows performance that is sensitive to the density of the boil-off gas. When the temperature of the boil-off gas is high and the density is lowered, the performance of the boil-off gas compressor 30 may rapidly deteriorate. Therefore, in this embodiment, after the boil-off gas is discharged from the liquefied gas storage tank 10 and then cooled by the liquefied gas while passing through the liquefied gas, it is transferred to the boil-off gas compressor 30, so that the boil-off gas compressor 30 Performance improvements can be implemented.

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, and stores the liquefied gas after passing through the inside of the liquefied gas stored in the liquefied gas storage tank (10). It extends to the outside of the tank 10.

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

The boil-off gas inlet (L11), even if the liquefied gas stored in the liquefied gas storage tank 10 is consumed as fuel, in preparation for the liquefied gas being filled with a certain amount or more, in consideration of the level of the liquefied gas, the lower part of the liquefied gas storage tank 10 By passing through, the boil-off gas can be provided to be cooled due to the liquefied gas, and the form is not particularly limited.

A blower 33 may be provided at the boil-off gas inlet L11. The blower 33 is the boil-off gas inlet (L11 ) In the upstream of the liquefied gas storage tank 10, the boil-off gas can be forced to flow.

Of course, any configuration capable of forcibly causing the flow of the boil-off gas, such as an ejector, in place of the blower 33 or together with the blower 33, may be used.

The boil-off gas bypass unit (L12) bypasses the boil-off gas inlet (L11) in the boil-off gas header (L10) and delivers boil-off gas to the boil-off gas 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 insufficient, the boil-off gas is stored in the liquefied gas storage tank ( 10) In the case where it can be determined that passing through the inside is not efficient, the boil-off gas bypass unit (L12) is the boil-off gas discharged from the liquefied gas storage tank 10 without passing through the boil-off gas inlet (L11). It can be delivered to the compressor (30).

In the boil-off gas bypass unit (L12), whether or not the bypass or the bypass flow rate can be adjusted by controlling the valve, and the bypass condition may include situations in which cooling of the boil-off gas is unnecessary or heating of the liquefied gas should be suppressed, in addition to the examples described above. can

As such, the present embodiment can improve the compression performance of the boil-off gas compressor 30 by exchanging heat with the liquefied gas stored in the liquefied gas storage tank 10 before the boil-off gas is delivered to the boil-off gas compressor 30. .

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

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

In this embodiment, the boil-off gas 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 rotational force generated by consuming gas. At this time, 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 drive unit 34 that receives rotational force for compressing the boil-off gas. The boil-off gas compressor 30 may be a centrifugal compressor or a screw-type compressor that compresses using rotational force, and a reciprocating compressor may also be used if a configuration for converting rotational force into translational motion is premised.

In the boil-off gas compressor 30, the drive unit 34 is connected to the output unit 111 of the engine 100. At this time, the drive unit 34 may be a driving gear that is connected to the output gear through gear meshing and rotates. Therefore, the evaporation gas is compressed by the rotational force of the drive gear.

At this time, between the output gear and the driving gear, a connection gear 341 interconnecting the two gears may be further provided. The connection gear 341 may be used to control rotational 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 drive unit 34 of the boil-off gas compressor 30 may be provided in the form of a pulley so that they can be connected by a belt or chain.

In this embodiment, the engine 100 is provided in plurality, and the boil-off gas compressor 30 may include a driving unit 34 connected to the output unit 111 of any one engine 100 .

At this time, another engine 100 not connected to the boil-off gas compressor 30 electrically transmits rotational force to the boil-off gas compressor 30 during initial operation of the boil-off gas compressor 30 . That is, the other engine 100 may be the power generation engine 120 .

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

In this embodiment, the boil-off gas compressor 30 connected to the engine 100 compresses the boil-off gas and supplies it to the engine 100 for operation of the engine 100 after all. However, unless a separate driving source is used (of course, a separate driving source can be used in this embodiment), the boil-off gas compressor 30 may not receive rotational force unless the engine 100 is operated.

Therefore, in this embodiment, electricity is transferred to the boil-off gas compressor 30 using the power generation engine 120 operated by liquefied gas at the time of initial operation to operate the boil-off gas compressor 30, whichever boil-off gas compressor 30 When the degree of operation proceeds, through the other engine 100 receiving the boil-off gas compressed by the boil-off gas compressor 30 in normal operation, it is possible to reverse the rotational force.

Of course, for one engine 100, during initial operation, the engine 100 operates with liquefied gas, transfers 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).

In this way, in this embodiment, the evaporation gas compressor 30 is provided to be operated by the rotational force generated by the engine 100, and the driving source for operation of the evaporation gas compressor 30 can be reduced or omitted.

Of course, the present invention is not limited to the above-described embodiment, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known technology as another embodiment.

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

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: gas processing 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: driving unit
341: connecting gear 40: forced carburetor
41: strainer 50: mist separator
60: gas heater 70: liquefied gas vaporizer
80: bent mast 100: engine
110: propulsion engine 120: power generation engine
111: output unit L1: boil-off gas supply line
L10: boil-off gas header L11: boil-off gas inlet
L12: boil-off gas bypass part 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: gassing-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 (7)

A liquefied gas storage tank storing liquefied gas therein and having a pump discharging the liquefied gas;
a boil-off gas compressor that compresses boil-off gas generated in the liquefied gas storage tank and supplies it to an engine; and
And a forced vaporizer for heating the liquefied gas discharged from the pump and passing it downstream of the boil-off gas compressor,
The engine includes a propulsion engine and a power generation engine whose operating efficiency depends on the methane number,
The boil-off gas compressed in the boil-off gas compressor is branched toward the power generation engine upstream of the junction of the liquefied gas passing through the forced vaporizer,
The liquefied gas heated in the forced vaporizer is transferred to the downstream of the boil-off gas compressor without separate gas-liquid separation,
In the propulsion engine, both the natural evaporation evaporation gas evaporated in the liquefied gas storage tank and compressed through the evaporation gas compressor and the forced evaporation evaporation gas discharged as a liquid in the liquefied gas storage tank and then vaporized in the forced evaporator The gas treatment system according to claim 1 , wherein only natural vaporization gas having a high methane number is transmitted to the power generation engine as it contains relatively less heavy hydrocarbons among the natural vaporization BOG and the forced vaporization BOG. According to claim 1,
A boil-off gas supply line through which boil-off gas discharged from the liquefied gas storage tank is transferred to the engine via the boil-off gas compressor; and
Further comprising a main liquefied gas supply line through which the liquefied gas discharged from the pump is transferred from the boil-off gas supply line to the downstream of the boil-off gas compressor via the forced vaporizer,
The boil-off gas supply line,
The gas processing system branched from the upstream of the point where the main liquefied gas supply line is connected downstream of the boil-off gas compressor and connected to the power generation engine. The method of claim 2, wherein the main liquefied gas supply line,
A gas treatment system that transfers the liquefied gas heated in the forced vaporizer to the boil-off gas supply line without separate gas-liquid separation. delete delete According to claim 2,
A liquefied gas vaporizer provided for gasing-up by heating and injecting liquefied gas delivered from the outside into the liquefied gas storage tank filled with inert gas before loading to replace the inert gas with liquefied gas; and
Further comprising a gassing-up line through which the liquefied gas heated in the liquefied gas vaporizer flows into the liquefied gas storage tank,
The pump supplies liquefied gas to the liquefied gas vaporizer,
The liquefied gas vaporizer heats the liquefied gas delivered from the pump according to the operating state of the forced vaporizer and supplies it to the boil-off gas supply line. A vessel having the gas treatment system according to any one of claims 1 to 3 and 6.

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