KR20220043058A - 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 fuel supply part supplying liquefied gas to a propulsion engine; a fuel collection part collecting surplus liquefied gas discharged from the propulsion engine; and a heat medium supply part supplying a heat medium to adjust the temperature of the liquefied gas supplied to the propulsion engine. The fuel supply part and the heat medium supply part are placed on one single gas treatment skid. In the gas treatment skid, a high-pressure pump pressing the liquefied gas in accordance with required pressure of the propulsion engine, and a heat exchanger controlling the temperature of the liquefied gas in accordance with required temperature of the propulsion engine, which are included in the fuel supply part, are placed on one side part, and a heat medium pump, and a heat medium heater heating the heat medium, which are included in the heat medium supply part, are placed on the other side part, and also, the one side part and the other side part are placed apart from each other to provide a maintenance space therebetween. Therefore, the present invention is capable of reducing environmental pollution and increasing energy efficiency.

Description

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

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

In general, liquefied petroleum gas, that is, LPG (Liquefied petroleum gas) is a liquefied product by pressurizing the gas at room temperature with hydrocarbons having a low boiling point such as propane and butane among petroleum components. This liquefied petroleum gas is filled in a small and light pressure vessel (cylinder) and widely used as fuel for household, business, industrial, and automobile use.

Liquefied petroleum gas is extracted in gaseous form at the production site, stored after being liquefied through a liquefied petroleum gas processing facility, and transported to the land while maintaining the liquid phase by a liquefied petroleum gas carrier, and then supplied to consumers in various forms such as gas. do.

Since the boiling point of such liquefied petroleum gas is around -50°C, a liquefied petroleum gas carrier for transporting liquefied petroleum gas must maintain a lower temperature than this. Therefore, the storage tank for storing the liquefied petroleum gas uses low-temperature steel (Low Temperature Carbon Steel and Nickel Steel) that is strong at low temperatures, and a re-liquefaction facility is also provided for the liquefied petroleum gas carrier.

These liquefied petroleum gas carriers generate propulsion by operating an engine using diesel oil in the prior art. However, in the process of burning diesel oil in a marine propulsion engine, nitrogen oxides (NOx), sulfur oxides (SOx), and carbon dioxide (CO2), which are harmful components, are generated. there is.

Therefore, in recent years, the development of engines that operate using liquefied petroleum gas and various systems for supplying liquefied petroleum gas to the engine have been continuously made in order to significantly lower the pollution degree of exhaust in comparison with the case of using diesel oil. there is.

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 provide a gas processing system capable of generating propulsion by using liquefied petroleum gas and a ship including the same.

A gas processing system according to an aspect of the present invention includes a fuel supply unit for supplying liquefied gas to a propulsion engine; a fuel recovery unit for recovering the liquid surplus liquefied gas discharged from the propulsion engine; and a heat medium supply unit for supplying a heat medium for temperature control of the liquefied gas supplied to the propulsion engine, wherein the fuel supply unit and the heat medium supply unit are disposed on one gas treatment skid, the gas treatment skid comprising: A high-pressure pump for pressurizing liquefied gas according to the required pressure of the propulsion engine, and a heat exchanger for adjusting the temperature of the liquefied gas according to the required temperature of the propulsion engine, which are included in the fuel supply unit, are disposed on one side, and the heat medium supply unit Including, a heat pump and a heat medium heater for heating the heat medium are disposed on the other side, and the one side and the other side are spaced apart to provide a maintenance space therebetween.

Specifically, the heat medium supply unit may further include a heat medium expansion tank disposed on the other side and controlling the flow of heat medium circulating between the heat medium heater and the heat exchanger.

Specifically, the fuel recovery unit may further include a collection tank for transferring the high-temperature liquefied gas discharged from the propulsion engine to the high-pressure pump and gas-liquid separation of the liquefied gas recovered from the propulsion engine, wherein the collection tank includes: It may be provided adjacent to the one side part between the one side part and the other side part, and may be spaced apart from the other side part.

Specifically, the maintenance space may have an L-shape surrounding the collection tank.

Specifically, the fuel recovery unit further includes a knockout drum that receives the gaseous liquefied gas separated from the collection tank, filters impurities, and then delivers it to the vent mast, wherein the knockout drum is located outside the gas treatment skid. It may be disposed adjacent to the vent mast.

Specifically, further comprising a re-liquefaction unit for liquefying the boil-off gas generated in the storage tank, wherein the re-liquefaction unit includes a compressor for compressing the boil-off gas and a condenser for cooling the boil-off gas compressed by the compressor, the compressor And at least the compressor of the condenser is accommodated in a cargo compressor room provided on an upper portion of the hull propelled by the propulsion engine, the cargo compressor room, the gas treatment skid on one surface facing the motor for operating the compressor An extended part may be provided to accommodate the gas, and a maintenance space for the gas treatment skid and the motor may be provided between the extended part and the motor.

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

The gas treatment system according to the present invention and a ship including the same can reduce environmental pollution and increase energy efficiency by using liquefied petroleum gas as a propulsion fuel, out of the conventional system using only diesel oil.

1 is a conceptual diagram of a gas processing system according to an embodiment of the present invention.
2 is a plan view of a gas treatment skid of a gas treatment system according to an embodiment of the present invention.
3 is a partial plan view of a ship on which a gas treatment system according to an embodiment of the present invention is mounted.
4 to 6 are perspective views of a gas processing skid of a gas processing system according to an 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 gist of the present invention, the detailed description thereof will be omitted.

In the present specification, the liquefied gas may be LPG (propane, butane, etc.) as a heavy hydrocarbon, but it is not limited thereto, and any substance (propylene, ammonia, hydrogen, etc.) can include

In addition, it should be noted that liquefied gas/evaporated gas in the present specification is classified based on the state inside the tank, and is not necessarily limited to liquid or gaseous due to the name.

The present invention includes a ship equipped with a gas treatment system as described below. At this time, a ship is a concept that includes all gas carriers, merchant ships that transport cargo or people other than gas, FSRUs, FPSOs, bunkering vessels, and offshore plants, but note that it may be a liquefied petroleum gas carrier as an example.

Although not shown in the drawings of the present invention, of course, a pressure sensor (PT), a temperature sensor (TT), etc. may be provided at an appropriate position without limitation, and the measurement value by each sensor is dependent on the operation of the components described below. Can be used in a variety of ways without limitation

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a gas processing system according to an embodiment of the present invention, FIG. 2 is a plan view of a gas processing skid of the gas processing system according to an embodiment of the present invention, and FIG. 3 is an embodiment of the present invention It is a partial plan view of a vessel equipped with a gas treatment system according to the present invention. 4 to 6 are perspective views of a gas treatment skid of a gas treatment system according to an embodiment of the present invention.

Hereinafter, each configuration included in an embodiment of the present invention will be first described in terms of fuel supply of liquefied gas, and then the gas treatment skid SD will be described in detail with reference to FIGS. 2 to 6 .

Referring to FIG. 1 , the gas treatment system 1 according to an embodiment of the present invention includes a storage tank 10 , a fuel supply unit 20 , a reliquefaction unit 30 , a fuel recovery unit 40 , and a heat medium supply unit. (50).

The storage tank 10 stores liquefied gas. The storage tank 10 may be a plurality of cargo tanks provided in the ship, which is a liquefied gas carrier. The storage tank 10 may be a tank for storing liquefied gas as a low-temperature liquid at atmospheric pressure, and various insulating structures may be added to the wall. In addition, the storage tank 10 may be a membranous tank or an independent tank, and the shape or specification thereof is not limited.

A transfer pump 11 may be provided to discharge the liquefied gas of the storage tank 10 to the outside. The transfer pump 11 may be provided inside the storage tank 10 and may be provided as a submerged type submerged in liquefied gas.

The transfer pump 11 may be an unloading pump, a stripping pump, a spray pump, etc. for processing liquefied gas as cargo, or a fuel pump separately provided to deliver the liquefied gas to the fuel supply unit 20 as fuel. The transfer pump 11 delivers the liquefied gas from the storage tank 10 to the liquefied gas supply line L10 connected to the fuel supply unit 20 .

Since the liquefied gas stored in the storage tank 10 is naturally evaporated by external heat penetration, the boil-off gas is generated in the storage tank 10 . BOG may be used as fuel of the propulsion engine E or may be reliquefied, and a BOG liquefaction line L30 for delivering BOG to the reliquefaction unit 30 may be provided in the storage tank 10 .

The storage tank 10 may be provided in plurality in order to respectively store at least two kinds of liquefied gases among liquefied gases (propane, butane, propylene, etc.) containing heavy hydrocarbons as a main component. For example, some of the storage tanks 10 may store propane, and the remaining storage tanks 10 may store butane.

The boil-off gas of the storage tank 10 is liquefied by the re-liquefaction unit 30 to be described later. In order to prevent this, in addition to the number of types of liquefied gas stored in the storage tank 10, it may be provided in consideration of additional backup. That is, when the storage tank 10 stores n types of liquefied gas, at least n+1 re-liquefaction units 30 may be provided.

The storage tank 10 may be a cargo tank as described above, but may be a fuel tank provided separately from the cargo tank, and may encompass both the cargo tank and the fuel tank. The fuel tank may be configured to receive liquefied gas from the cargo tank, and the design pressure and the liquefied gas storage pressure may be relatively high compared to the cargo tank. The fuel tank may be a Type C pressure vessel, and unlike the cargo tank mounted inside the hull, it may be disposed on the deck. Of course, the arrangement position or type of the fuel tank is not limited.

Liquefied gas or boil-off gas may be provided to be movable between the cargo tank and the fuel tank, and the fuel tank and the cargo tank may share the re-liquefaction unit 30 . At this time, the liquid BOG discharged from the cargo tank and condensed by the reliquefaction unit 30 may be transferred to the fuel tank, and vice versa.

The fuel supply unit 20 supplies the liquefied gas of the storage tank 10 to the propulsion engine (E). In the present specification, the propulsion engine (E) is a configuration for propelling a ship, and can be interpreted as any configuration capable of directly or indirectly generating propulsion force by consuming liquefied gas such as a turbine, a fuel cell, etc. rather than an engine.

The liquefied gas of the storage tank 10 is delivered to the propulsion engine E by a liquefied gas supply line L10 extending from the storage tank 10, and the fuel supply unit 20 is on the liquefied gas supply line L10. A high-pressure pump 21 and a heat exchanger 22 are provided.

The high-pressure pump 21 pressurizes the liquefied gas according to the required pressure of the propulsion engine E. The high-pressure pump 21 may be provided in plurality to enable mutual backup, and may be a centrifugal type, a reciprocating type, a screw type, or the like.

In the high-pressure pump 21, the suction pressure is set higher than the critical pressure of the liquefied gas or lower than the critical pressure to prevent cavitation, and vaporization does not occur even at the highest temperature (about 50 degrees Celsius) of the liquefied gas in the system. It may be a pressure that is not.

Alternatively, as the cooler 42 is provided in the fuel recovery unit 40 , vaporization in the high-pressure pump 21 may be prevented. This will be described later.

The heat exchanger 22 adjusts the temperature of the liquefied gas according to the required temperature of the propulsion engine (E). The heat exchanger 22 may be provided upstream of the high-pressure pump 21 as shown in the drawing, but may also be provided downstream of the high-pressure pump 21 .

Since the heat exchanger 22 may increase or decrease the temperature of the liquefied gas, it may be referred to as a fuel conditioner. For example, during the initial operation of this embodiment, since the flow rate of the high-temperature liquefied gas recovered from the propulsion engine E is large, the heat exchanger 22 can lower the temperature of the liquefied gas, and when entering into stable operation, the heat exchanger (22) can increase the temperature of the liquefied gas.

The heat exchanger 22 may implement heat exchange with liquefied gas using various heat sources supplied by the heat medium supply unit 50, for example, the heat medium may be seawater, fresh water, glycol water, exhaust, etc., but is limited thereto it is not However, in the present specification, it is assumed that the fruit is glycol water for convenience.

The re-liquefaction unit 30 compresses and liquefies the boil-off gas generated in the storage tank 10 . To this end, the BOG liquefaction line L30 may be provided in the storage tank 10 to deliver BOG to the reliquefaction unit 30 and return liquid BOG from the reliquefaction unit 30 to the storage tank 10 .

The reliquefaction unit 30 includes a compressor 31 , a condenser 32 , and the like.

The compressor 31 compresses the boil-off gas in multiple stages. The compressor 31 may be, for example, a multi-stage compressor 31 composed of three stages, but the number of stages is not limited to three stages.

The condenser 32 liquefies the compressed boil-off gas. Since the boiling point of the BOG whose pressure is increased by the compressor 31 is increased, the condenser 32 can liquefy the BOG even if it is cooled to a temperature lower than the BOG boiling point at atmospheric pressure.

The condenser 32 liquefies the compressed boil-off gas into a refrigerant such as seawater. The condenser 32 may have a structure of at least two streams including a boil-off gas stream into which the boil-off gas compressed in the compressor 31 flows, and a refrigerant stream through which a refrigerant for heat exchange with the boil-off gas flows. The type of the condenser 32 is not limited, such as Shell & Tube, PCHE, and a bath type is also possible.

As described above, since the storage tank 10 of this embodiment is provided to store two or more types of liquefied gases, respectively, the re-liquefaction unit 30 may include a total of three or more condensers 32 . In addition, three or more compressors 31 may be provided to respectively correspond to the condensers 32 .

In this case, the boil-off gas liquefaction line L30 is composed of at least two sets, so that different types of liquefied gas can be liquefied and recovered without contamination due to mixing.

The re-liquefaction unit 30 is provided to liquefy the liquefied gas recovered by the fuel recovery unit 40 to be described later in addition to the boil-off gas discharged from the storage tank 10 . Specifically, the gaseous liquefied gas from which lubricating oil, which is an impurity, has been removed from the knockout drum 44 of the fuel recovery unit 40 may be transferred to the reliquefaction unit 30 and condensed by the condenser 32 . At this time, the condensed liquefied gas may be returned to the storage tank 10 or delivered to the high-pressure pump 21 . To this end, the boil-off gas delivery line L31 is provided from the knockout drum 44 to the reliquefaction unit 30 .

The liquefied gas discharged from the propulsion engine (E) in a state where the lubricant used in the propulsion engine (E) is mixed is recovered by the fuel recovery unit 40 and delivered to the high-pressure pump 21, the propulsion engine (E) is reintroduced into In this case, in consideration of the amount of recovered liquefied gas, the flow rate transferred from the storage tank 10 to the high-pressure pump 21 may be controlled to be relatively small compared to the required flow rate of the propulsion engine E. That is, the supply flow rate from the storage tank 10 to the propulsion engine E, it is necessary to consider the recovery amount of the liquefied gas.

However, in the present embodiment, since at least a portion of the liquefied gas recovered from the fuel recovery unit 40 can be reliquefied to the reliquefaction unit 30 and returned to the storage tank 10, the propulsion engine E in the storage tank 10 ) when controlling the flow rate of the liquefied gas supplied to the propulsion engine (E), the need to consider the flow rate of the liquefied gas recovered from the propulsion engine (E) is reduced, so the control is simplified.

In addition, since the liquefied gas separated from the lubricating oil in the knockout drum 44 is reliquefied and delivered to the storage tank 10, in this embodiment, the liquefied gas in the storage tank 10 is contaminated by the lubricating oil of the propulsion engine (E). can avoid the risk of becoming

The fuel recovery unit 40 recovers the liquid surplus liquefied gas discharged from the propulsion engine (E). The propulsion engine (E) of this embodiment may be an engine (ME-LGI, etc.) supplied with liquefied gas in a liquid phase, and the flow rate of the engine (ME-GI, X-DF, etc.) It is difficult to fine-tune. Therefore, the propulsion engine (E) may be configured to receive the liquefied gas at a required flow rate or more and discharge the surplus liquefied gas.

At this time, the liquefied gas discharged from the propulsion engine (E) is a liquefied gas that has passed through the inside of the propulsion engine (E) and has a temperature/pressure corresponding to the required pressure of the propulsion engine (E) (for example, around 45 bar, 50°C or higher), the lubricant used in the propulsion engine (E) may have been mixed. In this case, in order to prevent cargo contamination, it is preferable not to deliver the recovered liquefied gas to the storage tank 10 (especially the cargo tank).

Therefore, the liquefied gas recovery line (L20) connected to the propulsion engine (E) so that the surplus liquefied gas is recovered is the fuel supply unit 20, not the storage tank 10, for the surplus liquefied gas returned from the propulsion engine (E). It can be transferred to the high-pressure pump 21 of the and re-introduced to the propulsion engine (E).

The fuel recovery unit 40 includes a pressure reducing valve 41, a cooler 42, etc. provided in the liquefied gas recovery line L20, and also a liquefied gas branch line L21 branched from the liquefied gas recovery line L20. It includes a collection tank 43 connected to, a knockout drum 44, and the like.

The pressure reducing valve 41 depressurizes the liquid liquefied gas. The pressure reducing valve 41 may be a Joule-Thompson valve, and may constitute a fuel supply train FVT together with a fuel supply valve provided in the liquefied gas supply line L10. The pressure reducing valve 41 may reduce the liquefied gas of high pressure (about 30 to 50 bar) recovered from the propulsion engine E to match the suction pressure of the high pressure pump 21 .

The cooler 42 cools the liquefied gas pressure-reduced by the pressure reducing valve 41 and delivers it to the high-pressure pump 21 . The cooler 42 may utilize a variety of refrigerants that are not limited, and may cool the liquefied gas below the boiling point of the depressurized liquefied gas.

The liquefied gas cooled by the cooler 42 is mixed upstream of the high-pressure pump 21 in the liquefied gas supply line L10 through the liquefied gas recovery line L20, and the liquefied gas recovery line L20 is liquefied gas A mixer (not shown) may be provided at a point connected to the supply line L10.

The collection tank 43 separates gas-liquid gas recovered from the propulsion engine E. When gaseous liquefied gas flows into the high-pressure pump 21, cavitation problems may occur. Therefore, in the present invention, the liquefied gas flowing along the liquefied gas recovery line L20 passes through the collection tank 43 as needed, while gas-liquid separation. As such, it is possible to block the inflow of the gaseous liquefied gas to the high-pressure pump 21 .

That is, the collection tank 43 collects at least a portion of the liquefied gas of the liquefied gas recovery line L20 and delivers only the liquid liquefied gas to the high-pressure pump 21 , thereby ensuring stable operation of the high-pressure pump 21 .

The collection tank 43 is connected in parallel to the flow of liquefied gas transferred from the pressure reducing valve 41 to the high pressure pump 21 . That is, the collection tank 43 is not provided on the liquefied gas recovery line L20, but liquefied gas branching from the liquefied gas recovery line L20 downstream of the pressure reducing valve 41 (and upstream of the cooler 42). It may be connected to the line L21.

That is, the liquefied gas pressure-reduced in the pressure reducing valve 41 is transferred to the high-pressure pump 21 via the collection tank 43 through the liquefied gas branch line L21, or the collection tank through the liquefied gas recovery line L20. Bypassing (43) may be delivered to the high-pressure pump (21), whether or not passing through the collection tank (43) can be controlled according to the flow rate or temperature of the liquefied gas discharged from the propulsion engine (E).

The gaseous liquefied gas branched from the collection tank 43 may be delivered to the knockout drum 44 . The knockout drum 44 may receive the liquefied gas recovered from the propulsion engine E from the collection tank 43 and filter out impurities (lubricating oil, etc.) contained in the liquefied gas.

The knockout drum 44 separates lubricating oil from the liquefied gas introduced therein. Specifically, the knockout drum 44 discharges the liquefied gas in the gas phase and the lubricating oil in the liquid phase. That is, the knockout drum 44 implements a gas-liquid separation function similarly to the collection tank 43 .

The knockout drum 44 may use a heating unit such as tracing to promote vaporization of the liquefied gas, and the tracing may be configured to use a medium such as steam or seawater as a heat source or to heat using electricity. there is.

The knockout drum 44 may heat liquefied gas mixed with lubricating oil by a heating unit, discharge the liquefied gas through a vent mast (not shown) or the like, and drain the lubricating oil from the lower portion for treatment (recycle).

Further, in the present embodiment, the knockout drum 44 transmits the liquefied gas from which the lubricant has been removed to the re-liquefaction unit 30 . Accordingly, the re-liquefaction unit 30 may receive the boil-off gas discharged from the storage tank 10 and/or the liquefied gas from which impurities are removed from the knockout drum 44 and liquefy it.

The knockout drum 44 may deliver the liquefied gas in the gas phase from which impurities are removed to the vent mast to vent it to the outside, but at least a portion of the liquefied gas in the gas phase flowing from the knockout drum 44 to the vent mast is reliquefied ( 30) can be transferred. Alternatively, as the entire amount of the liquefied gas from which impurities have been removed from the knockout drum 44 is transferred to the reliquefaction unit 30 , the knockout drum 44 may not be connected to the vent mast.

That is, in this embodiment, the re-liquefaction unit 30 may liquefy the boil-off gas generated in the storage tank 10 and return it to the storage tank 10, and/or lubricating oil used in the propulsion engine E is mixed. After being discharged from the propulsion engine (E) in this state, the liquefied gas delivered to the knockout drum 44 through the collection tank 43 may be liquefied and delivered to the storage tank 10 .

As described above, the reliquefaction unit 30 may include a plurality of condensers 32 corresponding to the type of liquefied gas, and a boil-off gas delivery line connected from one knockout drum 44 to the reliquefaction unit 30 ( L31) may be provided to be connected to all of the condensers 32, respectively.

Therefore, when two or more types of liquefied gas usable as fuel of the propulsion engine (E) are independently stored in each storage tank (10), when the first type of liquefied gas is supplied to the propulsion engine (E), and the second type In all cases of supplying the liquefied gas to the propulsion engine E, the liquefied gas may be transferred from one knockout drum 44 to the appropriate condenser 32 through the boil-off gas delivery line L31.

The heat medium supply unit 50 supplies heat for temperature control of the liquefied gas supplied to the propulsion engine (E). In this case, the fruit may be glycol water, seawater, or the like.

The heat medium supply unit 50 includes a heat medium pump 51 , a heat medium heater 52 , and a heat medium expansion tank 53 .

The heat pump 51 pumps heat and supplies it to the heat exchanger 22 . The heat medium may be provided to circulate between the heat medium heater 52 and the heat exchanger 22 , and the heat medium pump 51 controls circulation and pressure of the heat medium.

The heat medium heater 52 heats the heat medium. The heat medium heater 52 may heat the heat medium as a separate heat source, and in this case, the heat source may be seawater, steam, exhaust of the propulsion engine E, other waste heat in a ship, and the like.

The heat heater 52 may be disposed downstream of the heat pump 51 and upstream of the heat exchanger 22 based on the flow of heat, but the arrangement of the heat heater 52 and heat pump 51 is limited thereto. is not doing

The heat medium expansion tank 53 controls the flow of heat medium circulating between the heat medium heater 52 and the heat exchanger 22 . The heat medium expansion tank 53 is branched from the flow of the heat medium circulating along the closed loop, and may be used to increase or decrease the flow rate of the circulating heat medium or to relieve overpressure of the heat medium.

The heat medium expansion tank 53 may be disposed at a higher position than the heat heat pump 51 for controlling the pressure of the heat medium, which will be referred to again while describing the gas treatment skid SD.

As described above, since the heat exchanger 22 can implement cooling in addition to heating of the liquefied gas, the heat medium supply unit 50 may further include a heat medium cooler (not shown).

Hereinafter, with reference to FIG. 2 and the like, a gas treatment skid SD in which the fuel supply unit 20 and the heat medium supply unit 50 are disposed will be described.

2 to 6 , the fuel supply unit 20 and the heat medium supply unit 50 may be disposed on one gas treatment skid SD. Specifically, the gas treatment skid SD has a frame structure in the form of a frame, and the high-pressure pump 21 and the heat exchanger 22 of the fuel supply unit 20 are disposed on one side, and the heat medium of the heat medium supply unit 50 . The pump 51, the heat medium heater 52, the heat medium expansion tank 53, etc. are disposed on the other side.

In particular, in the gas treatment skid SD, one side portion on which the configuration of the fuel supply unit 20 is disposed and the other side portion on which the configuration of the heat medium supply portion 50 is disposed are spaced apart from each other. Through this, a maintenance space MS is provided between the one side and the other side.

When the operator enters the maintenance space MS, the fuel supply unit 20 is accessible in one direction, and the heat medium supply unit 50 is accessible in the other direction opposite to the operator. Accordingly, one maintenance space MS can be commonly used for maintenance of the fuel supply unit 20 and the heat medium supply unit 50 , and the present embodiment greatly improves the convenience of maintenance.

In addition, the gas treatment skid (SD) may be provided with a collection tank (43). That is, the gas treatment skid SD can be configured to include a fuel recovery unit 40 in addition to the fuel supply unit 20 and the heat medium supply unit 50 .

The collection tank 43 is provided between one side and the other side, and for example, may be disposed adjacent to one side. Due to the arrangement of the collection tank 43 , the maintenance space MS between the fuel supply unit 20 and the heat medium supply unit 50 in the gas treatment skid SD has an L shape surrounding the collection tank 43 . can be provided.

In this case, the L-shaped maintenance space (MS) is provided to open toward one side (the right side in FIG. 2) on which the collection tank 43 is installed adjacently, and the operator enters the maintenance space (MS) and the heat exchanger (22) , it is possible to efficiently perform maintenance for the configuration of the collection tank 43, the heat supply unit 50, and the like.

However, the high-pressure pump 21 of the fuel supply unit 20 may be difficult to access to the maintenance space MS described above, and the maintenance of the high-pressure pump 21 is processed through the structure of the cargo compressor room CR. can be This will be described later.

In the gas treatment skid SD, the collection tank 43 is disposed at a relatively central portion, and the heat exchanger 22 of the fuel supply unit 20 is disposed closer to the collection tank 43 compared to the high-pressure pump 21 . That is, the heat exchanger 22 may be disposed on the side of the heat medium supply unit 50 with the maintenance space MS interposed therebetween, thereby securing the maintenance space MS and minimizing the flow path of the heat medium.

The knockout drum 44 included in the fuel recovery unit 40 may be connected to the collection tank 43 and the liquefied gas branch line L21, but may not be disposed on the gas treatment skid SD. The knockout drum 44 may be disposed adjacent to the vent mast from the outside of the gas treatment skid SD in order to deliver the gaseous liquefied gas from which the lubricating oil is separated to the vent mast. For example, the knockout drum 44 may be disposed outside the cargo compressor room (CR) on the upper deck of the ship.

Hereinafter, the cargo compressor room CR will be described with reference to FIG. 3 .

At least the compressor 31 among the compressor 31 and the condenser 32 included in the reliquefaction unit 30 is accommodated in the cargo compressor room CR provided in the upper part of the hull. At this time, the cargo compressor room CR, a motor room (not shown) in which a motor for operating the compressor 31 is disposed may be divided by a partition wall (not shown) or the like.

At this time, the cargo compressor room (CR) is provided with an extended extension to accommodate the gas treatment skid (SD) on one side (the left side of FIG. 3, which may be the rear side based on the ship) facing the motor. That is, the cargo compressor room CR may have an extended front-to-back length or a ┘-shape in which a part of the rear surface protrudes.

The extension may be provided to accommodate the gas processing skid SD, and the motor room and the internal space may be in communication. At this time, a maintenance space (MS) for the gas treatment skid (SD) and the motor is provided between the extension and the motor. In addition, a maintenance space (MS) is provided outside the high-pressure pump (21) mounted on the gas treatment skid (SD) in the expansion part.

Therefore, in this embodiment, through the structural change of the cargo compressor room (CR) itself, the maintenance space ( MS) can be shared. In addition, it is possible to secure the maintenance space (MS) for the high-pressure pump (21) mounted on the gas treatment skid (SD) by securing the area of the extension.

The motor room and the extension part are not separated and can be applied as a dangerous area as an integrated one room, but if necessary, the motor room and the extension part may be provided to be isolated.

As described above, the gas treatment skid (SD) can secure the L-shaped maintenance space (MS) inside, and the L-shaped maintenance space ( MS) may be formed.

Therefore, in this embodiment, while sufficiently securing the maintenance space (MS) for the gas treatment skid (SD), it is possible to increase the space utilization by minimizing the expansion of the occupied area due to the maintenance space (MS).

As described above, in this embodiment, the liquefied gas in the gas phase from which the lubricant is removed from the knockout drum 44 is re-liquefied and returned instead of venting, thereby reducing costs by recycling the liquefied gas.

In addition, in this embodiment, the structure is simplified by skidding the fuel supply unit 20 and the heat medium supply unit 50 , and the maintenance space MS can be secured to greatly increase the maintenance efficiency.

In addition to the embodiments described above, the present invention encompasses all embodiments generated by a combination of the above embodiments and known techniques.

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. It will be clear that the transformation or improvement is possible.

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

1: gas treatment system 10: storage tank
11: transfer pump 20: fuel supply
21: high pressure pump 22: heat exchanger
30: reliquefaction unit 31: compressor
32: condenser CR: cargo compressor room
40: fuel recovery unit 41: pressure reducing valve
42: cooler 43: collection tank
44: knockout drum 50: fruit supply unit
51: heat pump 52: heat heater
53: fruit expansion tank MS: maintenance space
SD: Gas treatment skid L10: Liquefied gas supply line
L20: Liquefied gas recovery line L21: Liquefied gas branch line
L30: BOG liquefaction line L31: BOG delivery line
E: propulsion engine

Claims (7)

a fuel supply unit for supplying liquefied gas to the propulsion engine;
a fuel recovery unit for recovering the liquid surplus liquefied gas discharged from the propulsion engine; and
and a heat medium supply unit for supplying heat for temperature control of the liquefied gas supplied to the propulsion engine,
The fuel supply unit and the heat medium supply unit,
disposed on one gas treatment skid,
The gas treatment skid,
A high-pressure pump included in the fuel supply unit for pressurizing liquefied gas according to the required pressure of the propulsion engine, and a heat exchanger for adjusting the temperature of the liquefied gas according to the required temperature of the propulsion engine are disposed on one side,
A heat pump included in the heat medium supply unit, and a heat medium heater for heating the heat medium are disposed on the other side,
The one side portion and the other side portion are disposed to be spaced apart from each other to provide a maintenance space therebetween, a gas processing system. According to claim 1, wherein the heat supply unit,
The gas treatment system, which is disposed on the other side, further comprising a heat medium expansion tank for regulating the flow of heat medium circulating between the heat medium heater and the heat exchanger. According to claim 1, wherein the fuel recovery unit,
The high-temperature liquefied gas discharged from the propulsion engine is transferred to the high-pressure pump,
Further comprising a collection tank for gas-liquid separation of the liquefied gas recovered from the propulsion engine,
The collection tank is
A gas processing system provided adjacent to the one side portion between the one side portion and the other side portion and disposed spaced apart from the other side portion. According to claim 3, The maintenance space,
Having an L-shape surrounding the collection tank, a gas treatment system. The method of claim 3, wherein the fuel recovery unit,
It further comprises a knockout drum that receives the liquefied gas in the gas phase separated from the collection tank, filters impurities, and then delivers it to the vent mast,
The knockout drum is
and disposed adjacent to the vent mast outside of the gas treatment skid. The method of claim 1,
Further comprising a re-liquefaction unit for liquefying the boil-off gas generated in the storage tank,
The re-liquefaction unit,
A compressor for compressing the boil-off gas, and a condenser for cooling the boil-off gas compressed by the compressor,
At least the compressor of the compressor and the condenser,
It is accommodated in the cargo compressor room provided on the upper part of the hull propelled by the propulsion engine,
The cargo compressor room,
An extended portion is provided on one surface facing the motor for operating the compressor to accommodate the gas treatment skid, and a maintenance space for the gas treatment skid and the motor is provided between the expanded portion and the motor, gas processing system. A ship having the gas treatment system of any one of claims 1 to 6.

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