KR20190070469A - Gas treatment system and ship having the same - Google Patents

Abstract

The present invention relates to a gas treatment system and a ship. According to the present invention, the gas treatment system comprises: a liquefied gas storage tank placed inside a hull to store liquefied gas; a liquefied gas fuel tank which stores liquefied gas to be supplied to a high-pressure consumer and a low-pressure consumer, which are mounted on the hull; a re-liquefying apparatus which includes a compressor which compresses evaporated gas generated in the liquefied gas storage tank, and a condenser which condenses the evaporated gas; a liquefied gas supply apparatus which includes a low-pressure pump which pressurizes the liquefied gas discharged from the liquefied gas fuel tank by a pressure to supply the liquefied gas to the low-pressure consumer, and a high-pressure pump which pressurizes the liquefied gas pressurized by the low-pressure pump by a pressure to supply the liquefied gas to the high-pressure consumer; and an evaporated gas transfer unit which adds the evaporated gas compressed by the compressor to the liquefied gas, which is pressurized by the low-pressure pump and is supplied to the low-pressure consumer. The present invention aims to provide the gas treatment system and the ship, which are able to efficiently treat ethane to use it as engine fuel.

Description

[0001] DESCRIPTION [0002] Gas treatment systems and vessels [0003]

The present invention relates to a gas treatment system and a vessel.

A ship is a means of transporting large quantities of minerals, crude oil, natural gas, or more than a thousand containers. It is made of steel and buoyant to float on the water surface. ≪ / RTI >

Such a vessel generates thrust by driving an engine, a gas turbine or the like. At this time, the engine uses an oil fuel such as gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, Is driven to propel the propeller while the gas turbine uses a method of burning the fuel with compressed air and generating power by rotating the turbine blade through the temperature / pressure of the combustion air and delivering power to the propeller.

In recent years, however, LNG fuel is being used to drive demand for engines and turbines by using LNG as fuel in an LNG carrier carrying a liquefied natural gas (Liquefied Natural Gas), and LNG is used as a clean fuel And the reserves are more abundant than petroleum, the method of using LNG as a fuel for demand is applied to other ships than LNG carrier.

Furthermore, in addition to liquefied natural gas, researches have been conducted to use a gas which is lower in boiling point than normal temperature, such as liquefied petroleum gas or ethane, and is stored in a gaseous state at room temperature and stored in a liquid state as fuel .

However, there are still many problems to be solved in the case of using the gaseous fuel in comparison with the conventional case using the oil fuel such as the diesel, so that the research and development of the technology for treating the gaseous fuels are being carried out .

It is an object of the present invention to provide a gas treatment system and a vessel for efficiently treating ethane in order to use ethane as fuel for an engine .

A gas treatment system according to an aspect of the present invention includes: a liquefied gas storage tank provided inside a hull and storing liquefied gas; A liquefied gas fuel tank for storing a liquefied gas to be supplied to a high-pressure consumer and a low-pressure consumer, which are mounted on the hull; A liquefaction device having a compressor for compressing the evaporated gas generated in the liquefied gas storage tank and a condenser for condensing the compressed evaporated gas; A low pressure pump for pressurizing the liquefied gas discharged from the liquefied gas fuel tank at a pressure for supplying the liquefied gas to the low pressure consumer and a high pressure pump for pressurizing the liquefied gas pressurized by the low pressure pump to the high pressure consumer, Gas supply; And an evaporated gas delivery unit for delivering the evaporated gas compressed in the compressor to the liquefied gas supplied from the low pressure pump to the low pressure consumer.

Specifically, the liquefied gas may be ethane.

Specifically, the liquefied gas fuel tank may be provided outside the hull.

Specifically, the refill liquefier may deliver evaporated gas condensed in the condenser to the liquefied gas storage tank or the liquefied gas fuel tank.

A liquefied gas delivery line connected from the liquefied gas storage tank to the liquefied gas fuel tank; An evaporative gas liquefaction line connected from the liquefied gas storage tank to the liquefied gas storage tank or the liquefied gas fuel tank via the refill liquor; A high pressure liquefied gas supply line connected from the liquefied gas fuel tank to the high pressure consumer through the low pressure pump and the high pressure pump; And a low-pressure liquefied gas supply line branched from the downstream of the low-pressure pump in the high-pressure liquefied gas supply line and connected to the low-pressure consumer.

Specifically, the apparatus may further include a vaporizer provided downstream of the high-pressure pump in the high-pressure liquefied gas supply line for heating the liquefied gas pressurized at a high pressure.

Specifically, the apparatus may further include a forced vaporizer and a heater provided in the low-pressure liquefied gas supply line.

Specifically, the evaporation gas transmission portion may join the evaporation gas compressed in the compressor to the liquefied gas downstream of the forced vaporizer.

A ship according to one aspect of the present invention is characterized by having the gas treatment system.

The gas treatment system and the ship according to the present invention can maximize the system efficiency and stability by effectively implementing the processes of compressing and flowing the ethane in the process of supplying the ethane as fuel for propulsion of the ship to the engine.

1 is a side view of a vessel having a gas treatment system according to an embodiment of the invention;
2 is a conceptual diagram of a gas processing system according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the term " vaporization " does not necessarily mean a change from a liquid state to a gaseous state but may mean that it is heated in an already vaporized state.

Also, the liquefied gas or the evaporated gas is not limited in terms of the state of the substance by a term. For example, the liquefied gas may be referred to as a liquefied gas, and the liquefied gas may be referred to as a liquefied gas. However, the liquefied gas stored in the tank is spontaneously vaporized is referred to as the vapor gas.

1 is a side view of a vessel having a gas treatment system according to an embodiment of the invention;

Referring to Fig. 1, a vessel 1 having a gas treatment system 2 according to an embodiment of the present invention may be a liquefied gas carrier carrying liquefied gas. However, in this specification, the vessel 1 is used to mean an offshore plant for storing liquefied gas.

The liquefied gas may be ethane. That is, the vessel 1 of the present embodiment may be an ethane carrier. However, the present invention is not limited to the case where the liquefied gas is ethane, and it is needless to say that the liquefied gas may be liquefied natural gas, liquefied petroleum gas, etc. in addition to ethane.

The ship 1 is provided with a liquefied gas storage tank 20 and a liquefied gas fuel tank 30. The liquefied gas storage tanks 20 may be provided inside the hull 10, and a plurality of the liquefied gas storage tanks 20 may be provided in the longitudinal direction of the ship 1. The liquefied gas storage tank 20 may be of a membrane type or a stand-alone type, but is not particularly limited.

The liquefied gas storage tank 20 stores the ethane at a cryogenic temperature lower than the boiling point. However, heat may penetrate the liquefied gas storage tank 20 from outside, and in this case, some of the ethane stored in the liquefied gas storage tank 20 may be vaporized.

The vaporized ethane is discharged as an evaporation gas to the outside to prevent an increase in the internal pressure of the liquefied gas storage tank 20, and the discharged evaporated gas can be re-liquefied and treated by the re-liquefier 40, which will be described later. For this, an evaporative gas liquefaction line 41 may be connected to the liquefaction device 40 in the liquefied gas storage tank 20.

In each of the plurality of liquefied gas storage tanks 20, an evaporation gas liquefaction line 41 may be provided for evacuation gas discharge, and the evaporation gas liquefaction line 41 may be integrated with each other at the vapor main.

The liquefied gas stored in the liquefied gas storage tank 20 is a cargo to be transported to the destination by the vessel 1, and no handwashing should occur. Therefore, the liquefied gas stored in the liquefied gas storage tank 20 is not consumed in the vessel 1 in principle.

For this purpose, the vessel 1 can operate by consuming the liquefied gas stored in the liquefied gas fuel tank 30, but the liquefied gas is discharged from the liquefied gas storage tank 20 to the liquefied gas fuel tank 30 due to certain circumstances. And in this case, the flow rate discharged from the liquefied gas storage tank 20 is checked and can be used for future settlement.

A liquefied gas discharge line 21 may be provided from the liquefied gas storage tank 20 to the outside (such as the liquefied gas fuel tank 30), and the liquefied gas discharge line 21 may be provided in the unloading of the liquefied gas Can be used.

a liquefied gas discharge line 21 provided in a plurality of liquefied gas storage tanks 20 similar to a vapor main can be integrated in a liquid main except that a liquefied gas discharge line 21 connected to a liquefied gas fuel tank 30, Can be connected directly from a particular liquefied gas storage tank (20) without going through the liquid main. That is, the liquefied gas storage tank 20 for transferring the liquefied gas to the liquefied gas fuel tank 30 among the plurality of liquefied gas storage tanks 20 may be a part.

The liquefied gas discharge line 21 may be provided with a transfer pump 211 and the transfer pump 211 may be a submerged pump immersed in the liquefied gas storage tank 20 but is not limited thereto. That is, the transfer pump 211 may be provided outside the liquefied gas storage tank 20.

Hereinafter, the gas treatment system 2 provided in the liquefied gas carrier carrying the liquefied gas storage tank 20 will be described.

2 is a conceptual diagram of a gas processing system according to an embodiment of the present invention.

2, a gas processing system 2 according to an embodiment of the present invention includes a liquefied gas fuel tank 30, a liquefaction device 40, a liquefied gas supply device 50, 60, a vent portion 70, a return portion 80, and a leakage inspection portion 100.

The liquefied gas fuel tank 30 stores a liquefied gas to be supplied to a high-pressure consumer 90 and a low-pressure consumer 110 mounted on the hull 10. Here, the high-pressure customer 90 is a high-pressure engine for propelling the vessel 1, and may be an ME-GIE, an XDF engine, or the like. The pressure of the liquefied gas consumed by the high-pressure consumer 90 may be 200 to 400 bar, but is not particularly limited.

The low-pressure consumer 110 is a power generation engine for meeting the power demand in the ship 1, and a plurality of power generation engines may be provided and may be a DFDE or the like. At this time, the pressure of the liquefied gas consumed by the low-pressure consumer 110 may be about 10 bar.

It should be noted, however, that the terms high pressure and low pressure in this specification are meant to be relative terms and are not necessarily numerically limited. That is, the high-pressure consumer 90 may mean a facility that consumes liquefied gas at a higher pressure than the low-pressure consumer 110.

The liquefied gas fuel tank 30 may be provided outside the hull 10, and may be provided on the upper deck 11, for example. The liquefied gas storage tank 20 is disposed inside the hull 10 and the ship 1 has a sufficient free space on the upper deck 11. The liquefied gas fuel tank 30 is connected to the upper deck 11 by saddles (Not shown) or the like.

The liquefied gas fuel tank 30 may be of the pressure vessel type and may have a capsule shape. The liquefied gas fuel tank 30 can store the liquefied gas at a pressure equal to or higher than the atmospheric pressure and the liquefied gas discharged from the liquefied gas fuel tank 30 is pressurized through the low pressure pump 52, Can reach. That is, the liquefied gas fuel tank 30 can store the liquefied gas at a pressure lower than the required pressure of the low pressure consumer 110.

Of course, the liquefied gas fuel tank 30 can store the liquefied gas at a pressure not lower than the required pressure of the low-pressure consumer 110, in which case the low-pressure pump 52, which will be described later, can be omitted or replaced with a configuration such as a valve, have.

The liquefied gas fuel tank 30 can receive the liquefied gas from the outside such as on the ground before the ship 1 loads the liquefied gas into the liquefied gas storage tank 20 and departs. Accordingly, the vessel 1 uses the liquefied gas stored in the liquefied gas fuel tank 30 during the operation to the destination, so that the liquefied gas stored in the liquefied gas storage tank 20 can be dispensed with.

As in the liquefied gas storage tank 20, evaporative gas may also be generated in the liquefied gas fuel tank 30. However, in this embodiment, only the liquefied gas excluding the evaporated gas of the liquefied gas fuel tank 30 is transmitted to the low-pressure demand place 110 or the high-pressure demand place 90, and the evaporated gas generated in the liquefied gas fuel tank 30 is liquefied And returned to the gas storage tank 20. In this case, the evaporated gas recovery line 31 is provided in the liquefied gas storage tank 20 in the liquefied gas fuel tank 30.

The evaporated gas recovered to the liquefied gas storage tank 20 through the evaporated gas recovery line 31 is discharged through the evaporated gas liquefaction line 41 connected from the liquefied gas storage tank 20 to the refueling device 40 And can be re-liquefied in the liquefier 40. [

The re-liquefier device (40) re-liquefies the evaporated gas generated in the liquefied gas storage tank (20). The remelting device 40 may include a compressor 42 and a condenser 43. The compressor 42 is capable of compressing the evaporated gas discharged from the liquefied gas storage tank 20, and the boiling point of the evaporated gas can be increased by compression. Therefore, the compressed evaporated gas can be liquefied even if it is not cooled to the boiling point at atmospheric pressure.

The compressor 42 can compress the evaporation gas to about 10 bar and compress the evaporation gas to a pressure corresponding to the pressure of the liquefied gas discharged from the low pressure pump 52. This is because at least a part of the evaporated gas compressed by the compressor 42 can be supplied to the low-pressure consumer 110 without being transferred to the condenser 43, as will be described later.

A plurality of compressors 42 may be arranged in series to implement multi-stage compression, and / or a plurality of compressors 42 may be arranged in parallel to divide load or implement backup. The compressor 42 may be used as a cargo compressor for warm-up of the liquefied gas storage tank 20 as well as for re-liquefaction.

The condenser 43 liquefies the evaporation gas using various refrigerants. For example, the condenser 43 may use nitrogen, R134a, propane, methane, or the like as a refrigerant. Or the condenser 43 is a concept encompassing the liquefaction of the compressed evaporated gas by reducing the pressure of the compressed evaporation gas to the line-thomson valve, with or without heat exchange using the refrigerant. That is, the condenser 43 may be configured to liquefy the vaporized gas in various ways not limited.

The liquefaction device 40 in the liquefied gas storage tank 20 is provided with an evaporation gas liquefaction line 41 and the evaporation gas liquefaction line 41 is connected to the liquefied gas storage tank 20 or liquefied gas storage tank 20, And may extend to the gas fuel tank 30.

Thus, the evaporated gas liquefied in the refueling device 40 can be returned to the liquefied gas storage tank 20 or transferred to the liquefied gas fuel tank 30. Since the evaporated gas generated in the liquefied gas fuel tank 30 can be introduced into the liquefaction device 40 through the liquefied gas storage tank 20 as described above in the liquefied gas fuel tank 30, The liquefied gas stored in the liquefied gas storage tank 20 may not reduce the stored amount of the liquefied gas even if the liquefied gas is delivered to the liquefied gas fuel tank 30. [

Of course, the flow rate of the evaporative gas delivered to the liquefied gas fuel tank 30 in the refueling device 40 can be controlled based on the flow rate of the evaporative gas recovered from the liquefied gas fuel tank 30 to the liquefied gas storage tank 20 have.

The liquefied gas supply device 50 supplies the liquefied gas of the liquefied gas fuel tank 30 to the low-pressure consumer 110 and / or the high-pressure consumer 90. The liquefied gas supply device 50 includes a high-pressure liquefied gas supply line 51 connected from the liquefied gas fuel tank 30 to the high-pressure consumer 90 and a low-pressure liquefied gas supply line 51 branched from the high- And a low-pressure liquefied gas supply line 55 connected to the low-pressure liquefied gas supply line.

The liquefied gas supply device 50 may include a low-pressure pump 52, a high-pressure pump 53, a vaporizer 54, and the like provided in the high-pressure liquefied gas supply line 51. Accordingly, the liquefied gas can be passed from the liquefied gas fuel tank 30 through the low-pressure pump 52 and the high-pressure pump 53 in sequence, and then delivered to the high-pressure consumer 90.

The high pressure liquefied gas supply line 51 is connected from the liquefied gas fuel tank 30 to the high pressure consumer 90 via the low pressure pump 52 and the high pressure pump 53. In the high pressure liquefied gas supply line 51, A damper 511 for suppressing the damping of the liquefied gas, a flow meter 512 for checking the flow rate of the liquefied gas, a gas for regulating the flow rate of the liquefied gas supplied to the high pressure consumer 90, Valve train 513, and the like may be disposed.

The low pressure pump 52 pressurizes the liquefied gas discharged from the liquefied gas fuel tank 30. The low pressure pump 52 can pressurize the liquefied gas to a pressure required to supply the liquefied gas to the low pressure consumer 110. For example, the low pressure pump 52 pressurizes the liquefied gas to about 10 bar, which is the required pressure of the low pressure consumer 110 .

The reason why the discharge pressure of the low pressure pump 52 provided on the high pressure liquefied gas supply line 51 connected to the high pressure consumer 90 is made in accordance with the required pressure of the low pressure consumer 110 is that the high pressure liquefied gas supply line 51, Pressure liquefied gas supply line 55 is branched from the downstream side of the low-pressure pump 52 toward the low-pressure consumer 110.

A plurality of low-pressure pumps 52 may be provided in parallel. As described with reference to the compressor 42, a plurality of low-pressure pumps 52 may be capable of backing up each other or sharing loads.

The high pressure pump 53 pressurizes the liquefied gas pressurized by the low pressure pump 52 to a pressure for supplying the high pressure consumer 90 to the high pressure consumer. The high pressure pump 53 can pressurize the liquefied gas at a required pressure of 200 bar to 400 bar of the high pressure customer 90 and the high pressure pump 53 can pressurize the liquefied gas at a required pressure difference between the high pressure consumer 90 and the low pressure consumer 110 The gas can be pressurized.

The high-pressure pump 53 may be provided in parallel with a plurality of the same or similar low-pressure pump 52, and the low-pressure pump 52 and the high-pressure pump 53 may be the same type or different types. For example, the high-pressure pump 53 may be a reciprocating type, and the low-pressure pump 52 may be a centrifugal type or the like.

The vaporizer 54 is provided downstream of the high-pressure pump 53 in the high-pressure liquefied gas supply line 51 to heat the liquefied gas pressurized at a high pressure. The vaporizer 54 can heat the liquefied gas to a required temperature of the high-pressure consumer 90 using various unrestricted fruits such as seawater, glycol water, brine, steam, etc. For example, the vaporizer 54 The liquefied gas can be heated to about 40 degrees.

The liquefied gas supply device 50 includes a low-pressure liquefied gas supply line 55 branched from the downstream of the low-pressure pump 52 and connected to the low-pressure consumer 110 in the high-pressure liquefied gas supply line 51 as described above A forced vaporizer 56 provided in the low-pressure liquefied gas supply line 55, a heater 57, a buffer tank 58, and the like.

The forced vaporizer 56 vaporizes the liquefied gas which is pressurized by the low pressure pump 52 and then branched to the low pressure liquefied gas supply line 55. At this time, the forced vaporizer 56 can use various fruits such as glycol water and can heat the liquefied gas to a required temperature of the low-pressure consumer 110.

Since the temperature of the forced vaporizer 56 can be changed while the compressed vaporized gas is merged downstream of the forced vaporizer 56 even if the forced vaporizer 56 heats the liquefied gas to the required temperature of the low pressure consumer 110, A heater 57 for adjusting the temperature of the liquefied gas to a required temperature of the low-pressure consumer 110 may be provided downstream of the low-pressure consumer 110. [

The heater 57 heats the vaporized liquefied gas in the forced vaporizer 56. The heater 57 heats the liquefied gas using various unrestricted fruits such as the glycol water as described in the vaporizer 54 or the forced vaporizer 56 or the like, It is possible to adjust the liquefied gas whose temperature is somewhat lowered to the required temperature of the low-pressure consumer 110. [

The buffer tank 58 suppresses the pulsation of the liquefied gas supplied to the low-pressure consumer 110. The buffer tank 58 may be in the form of a tank for forming a temporary storage space or may be formed in an expanded form in the low pressure liquefied gas supply line 55 or the like to reduce the pressure fluctuation of the liquefied gas, And the system stability can be secured.

A gas valve train 551 may be provided upstream of the low-pressure consumer 110 in the low-pressure liquefied gas supply line 55 and a flow meter (not shown) described in the high-pressure liquefied gas supply line 51 may be provided in the low- It may be provided in the gas supply line 55.

The low pressure consumer 110 may be provided with a plurality of units in consideration of the in-ship power demand, unlike the high pressure consumer 90 provided for propelling the vessel 1. For example, the low pressure consumer 110 has a relatively large power generation capacity Two power generation engines and two power generation engines having relatively small power generation capacity. In this case, the low-pressure liquefied gas supply line 55 may be branched downstream of the buffer tank 58 and connected to each power generation engine.

The evaporated gas delivery portion 60 pressurizes the evaporated gas compressed by the compressor 42 of the remanufacturing device 40 into the liquefied gas which is pressurized by the low pressure pump 52 and supplied to the low pressure consumer 110. To this end, the evaporation gas delivery portion 60 is connected downstream of the forced vaporizer 56 in the low pressure liquefied gas supply line 55, between the compressor 42 and the condenser 43 in the evaporation gas liquefaction line 41 May be provided in a line form.

The evaporated gas delivery portion 60 can cause the evaporated gas compressed in the compressor 42 to merge into the liquefied gas downstream of the forced vaporizer 56 and the evaporated gas in the low pressure liquefied gas supply line 55 60 may be connected to each other through a mixer (not shown).

The present embodiment can operate the high pressure consumer 90 and the low pressure consumer 110 using the liquefied gas stored in the liquefied gas fuel tank 30 and the evaporated gas generated in the liquefied gas fuel tank 30 can be supplied to the high pressure consumer 90) and the like.

At least a part of the evaporated gas generated in the liquefied gas storage tank 20 may be transferred to the low-pressure consumer 110 through the evaporated-gas delivery unit 60. That is, the high-pressure consumer 90 operates only with the liquefied gas, and the low-pressure consumer 110 can operate with the liquefied gas and the evaporated gas.

The evaporated gas generated in the liquefied gas fuel tank 30 is recovered to the liquefied gas storage tank 20 through the evaporated gas recovery line 31 and the evaporated gas in the liquefied gas storage tank 20 is returned to the liquefied gas storage tank 20 The evaporated gas generated in the liquefied gas fuel tank 30 flows into the fuel in the liquefied gas storage tank 20 and the low pressure consumer 110 via the compressor 42 in the liquefaction device 40 It can be seen as being used.

In this case, even if the evaporated gas generated in the liquefied gas storage tank 20 is consumed by the low-pressure consumer 110, the storage capacity of the liquefied gas storage tank 20 may not be reduced. Of course, considering the flow rate of the evaporated gas recovered from the liquefied gas fuel tank 30 to the liquefied gas storage tank 20, the amount of evaporated gas delivered to the low-pressure liquefied gas supply line 55 through the evaporated- The flow rate can be controlled.

The operation of the compressor 42, the condenser 43 and the low-pressure pump 52 of the refueling device 40 can be performed as follows according to the amount of the evaporating gas. The low pressure pump 52 can be continuously operated regardless of the evaporation gas flow rate for the operation of the high pressure consumer 90 and the low pressure consumer 110 and the operation of the condenser 43 can be controlled depending on the evaporation gas flow rate have.

Also, if the evaporator gas is sufficient, some of the evaporated gas compressed in the compressor 42 is not transferred to the condenser 43, 60 to the low-pressure consumer 110. In this case, the flow rate of the evaporation gas flowing into the condenser 43 may be smaller than the flow rate of the evaporation gas flowing into the compressor 42.

Evaporation gas flow rate enough lack Compressors (42) behavior
(The compressed evaporated gas is supplied to the low-pressure consumer 110 via the evaporated-gas delivery portion 60) Operation X Condensers (43) behavior Operation X Low pressure pump (52) behavior behavior

However, the compressor 42 provided in the re-liquefier 40 may be provided in multiple stages as mentioned above. The evaporation gas delivery portion 60 is connected to the low-pressure liquefied gas supply line 55 ). In this case, the remaining evaporative gas not transferred to the evaporative gas delivery unit 60 may be further compressed by the compressor 42 and then delivered to the condenser 43. Of course, the point where the evaporation gas delivery portion 60 is connected in the refill liquor 40 can be variously determined according to the compression pressure of the compressor 42 and the required pressure of the low pressure consumer 110.

The vent portion 70 discharges the evaporation gas generated in the liquefied gas storage tank 20 and / or the liquefied gas in the high-pressure liquefied gas supply line 51 to the outside. The vent portion 70 is provided for discharging the evaporation gas or the like to the outside (atmosphere or the like) in a situation where the evaporation gas or the liquefied gas can not be consumed. The vent portion 70 may include the low pressure vent line 71 and the high pressure vent line 72 have.

The low-pressure vent line (71) discharges the evaporated gas generated in the liquefied gas storage tank (20) to the outside. The low pressure vent line 71 may include a low pressure vent mast 711 for evacuation of the evaporative gas.

The evaporated gas generated in the liquefied gas fuel tank 30 is recovered to the liquefied gas storage tank 20 through the evaporated gas recovery line 31 so that the evaporated gas generated in the liquefied gas fuel tank 30 is returned to the liquefied gas storage tank 20 Pressure vent line 71 to the low-pressure vent mast 711 via the low-pressure vent line 71.

The low pressure vent line 71 may of course be connected directly to the liquefied gas fuel tank 30 or may be provided with an evaporation gas discharge line 73 connected to the low pressure vent mast 711 in the evaporative gas recovery line 31 have.

The evaporated gas of the liquefied gas fuel tank 30 is discharged to the low pressure vent mast 711 through the low pressure vent line 71 which is directly connected to the liquefied gas fuel tank 30, Pressure vent line 71 via the liquefied gas storage tank 20 to the low pressure vent mast 711 and / or through the evaporative gas recovery line 31 and the evaporative gas discharge line 73 And can be discharged to the low pressure vent mast 711.

However, a valve (not shown) may be provided in the low-pressure vent line 71, the evaporation gas recovery line 31, the evaporation gas discharge line 73, etc., and the opening pressures of the respective valves may be different from each other .

For example, the evaporated gas of the liquefied gas fuel tank 30 is transmitted to the low-pressure vent mast 711 via the liquefied gas storage tank 20, and the internal pressure of the liquefied gas fuel tank 30 is set to the first pressure Pressure vent line 71 directly connected to the liquefied gas fuel tank 30 when the evaporation gas discharge line 73 is opened and the internal pressure of the liquefied gas fuel tank 30 exceeds the second pressure which is larger than the first pressure, Can be opened.

The high-pressure vent line 72 discharges the high-pressure liquefied gas to the outside at the downstream of the high-pressure pump 53. The high-pressure vent line 72 may include a high-pressure vent mast 721 for discharging the high-pressure liquefied gas. In order to reduce noise and vibration generated when the high-pressure liquefied gas is discharged, unlike the low- The high-pressure vent line 72 may be provided with a silencer 722.

The high pressure vent line 72 may be provided upstream and downstream of the vaporizer 54 and includes a high pressure vent line 72 branched from the upstream of the vaporizer 54 in the high pressure liquefied gas supply line 51, The high pressure vent lines 72 branching from the downstream of the vaporizer 54 in the supply line 51 can be joined together and connected to the high pressure vent mast 721. [

The reason why the liquefied gas before and after the vaporizer 54 can be integrated and discharged to the high pressure vent mast 721 is because the temperature of the liquefied gas discharged in the case of the vent is not important and the pressure is important.

The liquefied gas discharged before and after the vaporizer 54 can be discharged through one high pressure vent mast 721 since they are all the same / similar high pressure. Of course, since the evaporated gas generated in the liquefied gas fuel tank 30 is low in pressure unlike the liquefied gas before and after the vaporizer 54, the low-pressure vent mast 711 may be used instead of the high-pressure vent mast 721.

The return portion 80 returns the liquefied gas supplied from the liquefied gas fuel tank 30 to the high-pressure demand place 90. The return portion 80 includes a liquefied gas recovery line 81 that returns the liquefied gas discharged from the liquefied gas fuel tank 30 and before entering the low pressure pump 52. [

The liquefied gas recovery line 81 is a line for supplying the surplus liquefied gas that has not flowed into the low pressure pump 52 when sufficient liquefied gas of the effective suction head NPSHr or more of the low pressure pump 52 is discharged from the liquefied gas fuel tank 30 To the liquefied gas fuel tank (30).

The return portion 80 includes a low pressure liquefied gas return line 82 for withdrawing the liquefied gas to the liquefied gas fuel tank 30 downstream of the low pressure pump 52 and a low pressure liquefied gas return line 82, Pressure pump 52 so that a certain amount of liquefied gas is circulated to the low-pressure pump 52 so that the load of the high-pressure pump 52 can be maintained at a predetermined level or higher. The low pressure liquefied gas return line 82 may thus be referred to as the minimum flow line.

The return section 80 further includes a high pressure liquefied gas return line 83 for returning liquefied gas to the liquefied gas fuel tank 30 downstream of the high pressure pump 53 and downstream of the vaporizer 54, Line 84. < / RTI >

The liquefied gas recovery line 81 and the low pressure liquefied gas return line 82 are provided independently of each other in order to realize the respective effects of satisfying the effective suction head of the low pressure pump 52 and ensuring minimum operation of the low pressure pump 52 While the high pressure liquefied gas return line 83 and the hot liquefied gas return line 84 may be integrated with each other and connected to the liquefied gas fuel tank 30.

Such a return unit 80 can return an excessive amount of liquefied gas that can not be consumed by the high-pressure consumer 90 to the liquefied gas fuel tank 30 to prevent overpressure in the high-pressure liquefied gas supply line 51, The return valves (not shown) provided in the high-pressure liquefied gas return line 83 and the high-temperature liquefied gas return line 84, respectively, may be provided to be opened under different pressure conditions. For example, the opening pressure of the return valve provided in the hot liquefied gas return line 84 may be higher than the opening pressure of the return valve provided in the high-pressure liquefied gas return line 83.

The leak inspection portion 100 inspects the leakage of liquefied gas in the high-pressure liquefied gas supply line 51 and the like. The leak detector 100 may be provided in the high pressure vent line 72 and the high pressure liquefied gas supply line 51 connected to the high pressure consumer 90.

The high-pressure vent line 72 and the high-pressure liquefied gas supply line 51 are required to flow an explosive liquefied gas. Therefore, the high-pressure vent line 72 and the high-pressure liquefied gas supply line 51 may be provided in a double- An air inlet portion 101 for introducing air into the outer tube, and an air outlet portion 102 for discharging air through an outer tube of the high-pressure liquefied gas supply line 51.

In this case, the leak inspection unit 100 introduces air through the air inflow portion 101 of the high-pressure vent line 72, passes through a portion of the high-pressure consumer 90, It is possible to check the liquefied gas leakage by checking whether the liquefied gas is contained in the collected air after collecting the air escaping through the exhaust pipe 102.

The air discharge unit 102 may be provided between the gas valve train 513 and the high-pressure consumer 90 in the high-pressure liquefied gas supply line 51. [ Of course, the positions of the air inlet 101 and the air outlet 102 in the leak detector 100 may be opposite to each other. Further, the leak detector 100 can use any fluid that can be separated from the liquefied gas in place of the air.

As described above, the present embodiment can secure the effects of improving the stability, increasing the efficiency, and reducing the cost by constructing an optimized system in which ethane can be used as the fuel for the propulsion engine in the ethane carrier carrying the ethane .

In addition to the embodiments described above, the present invention encompasses all of the embodiments that occur by the combination of the above embodiment and the known art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Ship 2: Gas treatment system
10: Hull 11: Upper deck
20: liquefied gas storage tank 21: liquefied gas discharge line
211: Transfer pump 30: Liquefied gas fuel tank
31: Evaporative gas recovery line 40: Re-liquefying device
41: Evaporative gas liquefaction line 42: Compressor
43: condenser 50: liquefied gas supply device
51: high pressure liquefied gas supply line 511: damper
512: Flow meter 513: Gas valve train
52: Low pressure pump 53: High pressure pump
54: vaporizer 55: low-pressure liquefied gas supply line
551: Gas valve train 56: Forced vaporizer
57: heater 58: buffer tank
60: Evaporative gas delivery portion 70: Vent portion
71: Low pressure vent line 711: Low pressure vent mast
72: High pressure vent line 721: High pressure vent mast
722: Silencer 73: Evaporative gas discharge line
80: return portion 81: liquefied gas recovery line
82: Low pressure liquefied gas return line 83: High pressure liquefied gas return line
84: High temperature liquefied gas return line 90: High pressure consumer
100: leak detector 101: air inlet
102: air outlet 110: low pressure consumer

Claims (9)

A liquefied gas storage tank provided inside the hull and storing liquefied gas;
A liquefied gas fuel tank for storing a liquefied gas to be supplied to a high-pressure consumer and a low-pressure consumer, which are mounted on the hull;
A liquefaction device having a compressor for compressing the evaporated gas generated in the liquefied gas storage tank and a condenser for condensing the compressed evaporated gas;
A low pressure pump for pressurizing the liquefied gas discharged from the liquefied gas fuel tank at a pressure for supplying the liquefied gas to the low pressure consumer and a high pressure pump for pressurizing the liquefied gas pressurized by the low pressure pump to the high pressure consumer, Gas supply; And
And an evaporated gas delivery unit for delivering the evaporated gas compressed by the compressor to the liquefied gas that is pressurized by the low pressure pump and supplied to the low pressure consumer. 2. The method of claim 1,
Ethane. ≪ / RTI > 2. The fuel cell system according to claim 1,
Wherein the hull is provided outside the hull. 2. The liquefaction apparatus according to claim 1,
And deliver the condensed vapor gas in the condenser to the liquefied gas storage tank or the liquefied gas fuel tank. The method according to claim 1,
A liquefied gas delivery line connected from said liquefied gas storage tank to said liquefied gas fuel tank;
An evaporative gas liquefaction line connected from the liquefied gas storage tank to the liquefied gas storage tank or the liquefied gas fuel tank via the refill liquor;
A high pressure liquefied gas supply line connected from the liquefied gas fuel tank to the high pressure consumer through the low pressure pump and the high pressure pump; And
And a low-pressure liquefied gas supply line branched from the low-pressure pump in the high-pressure liquefied gas supply line and connected to the low-pressure consumer. 6. The method of claim 5,
Further comprising a vaporizer provided downstream of the high-pressure pump in the high-pressure liquefied gas supply line for heating the liquefied gas pressurized at a high pressure. 6. The method of claim 5,
Further comprising a forced vaporizer and a heater provided in the low-pressure liquefied gas supply line. 8. The apparatus according to claim 7,
Wherein the vaporized gas compressed in the compressor is joined to the liquefied gas downstream of the forced vaporizer. A ship characterized by having the gas treatment system of any one of claims 1 to 8.

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