KR101767551B1 - Device for re-liquefaction of BOG of floating vessel - Google Patents

Device for re-liquefaction of BOG of floating vessel Download PDF

Info

Publication number
KR101767551B1
KR101767551B1 KR1020150126277A KR20150126277A KR101767551B1 KR 101767551 B1 KR101767551 B1 KR 101767551B1 KR 1020150126277 A KR1020150126277 A KR 1020150126277A KR 20150126277 A KR20150126277 A KR 20150126277A KR 101767551 B1 KR101767551 B1 KR 101767551B1
Authority
KR
South Korea
Prior art keywords
gas
discharged
compressor
liquefying
unit
Prior art date
Application number
KR1020150126277A
Other languages
Korean (ko)
Other versions
KR20170029228A (en
Inventor
이상우
Original Assignee
대우조선해양 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020150126277A priority Critical patent/KR101767551B1/en
Publication of KR20170029228A publication Critical patent/KR20170029228A/en
Application granted granted Critical
Publication of KR101767551B1 publication Critical patent/KR101767551B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0185—Arrangement comprising several pumps or compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/038—Treating the boil-off by recovery with expanding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Disclosed is an evaporation gas re-liquefaction apparatus and method.
In the evaporation gas remelting apparatus for re-liquefying the evaporation gas through heat exchange between the evaporation gases, an expansion means is additionally provided upstream of the heat exchanger to reduce the temperature of the evaporation gas discharged from the storage tank through the heat exchanger and supplied to the compressor, It is an object of the present invention to improve the liquefaction performance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for re-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an evaporating gas re-liquefying apparatus for a ship, and more particularly, to an evaporating gas re-liquefying apparatus for a ship capable of improving the evaporating gas re-liquefaction performance of a ship.

Storage tanks for storing liquefied natural gas, including liquefied natural gas, for fuel transport at sea are equipped with facilities for insulation between the inside and the outside of the storage tank.

However, in spite of this insulation equipment, complete insulation between the inside and outside of the storage tank is impossible, so that vaporization of the liquefied gas continuously occurs inside the storage tank. In this way, naturally vaporized gas is called boil off gas. If such evaporation gas is continuously accumulated in the storage tank, problems such as explosion may occur. Therefore, a method of withdrawing the evaporation gas generated in the storage tank to the outside and supplying it to the fuel demand portion of the engine or the like, or re-liquefying the evaporation gas and returning it to the storage tank is used.

On the other hand, as a method for re-liquefying the evaporation gas, a method of re-liquefying it with a separate refrigerant, or a method of re-liquefying the evaporation gas by recovering the cold heat of the evaporation gas through heat exchange between the evaporation gases is used.

In the case of re-liquefying the evaporation gas through heat exchange between the evaporation gases, the evaporation gas discharged from the storage tank and the evaporation gas discharged from the compressor are heat-exchanged, and the evaporation gas compressed and discharged from the compressor is cooled. Conversely, the evaporated gas discharged from the storage tank is heated and then supplied to the compressor.

On the other hand, since the volume of the gas is proportional to the temperature, the higher the temperature of the evaporated gas supplied to the compressor, the smaller the amount of the evaporated gas that the compressor can compress. Therefore, the temperature of the evaporation gas supplied to the compressor needs to be as low as possible.

Accordingly, it is an object of the present invention to provide a device for re-liquefying evaporative gas provided in a ship, which reduces the temperature of the evaporative gas supplied to the compressor to reduce the capacity of the compressor and improve the liquefaction performance of the evaporative gas have.

According to an aspect of the present invention, there is provided an apparatus for re-liquefying an evaporative gas of a ship, comprising: a storage tank for storing liquefied gas; A compression unit for compressing the evaporated gas discharged from the storage tank; A liquefaction unit for liquefying part of the evaporated gas discharged from the compression unit; The re-liquefaction unit comprising: a heat exchanger for exchanging heat between the evaporated gas discharged from the storage tank and the evaporated gas compressed by the compression unit to cool the compressed evaporated gas; And first expansion means and second expansion means for expanding and cooling the compressed evaporated gas; Wherein the first expansion means is disposed upstream of the heat exchanger and the second expansion means is disposed downstream of the heat exchanger.

Wherein the compression unit comprises: a fuel supply compressor for supplying an evaporation gas to a fuel demand portion using an evaporation gas as fuel; Wherein the fuel supply compressor is a multi-stage compressor, and a part of the evaporation gas supplied to the fuel supply compressor is discharged while being compressed by the fuel supply compressor to be supplied to the first fuel demand portion, Another portion of the evaporated gas supplied to the compressor for the fuel supply can be compressed to the end and supplied to the second fuel demand portion.

According to a second aspect of the present invention, there is provided an apparatus for re-liquefying an evaporative gas of a ship, comprising: a storage tank for storing liquefied gas; A compression unit for compressing the evaporated gas discharged from the storage tank; A re-liquefaction unit for re-liquefying the evaporated gas discharged from the compression unit; Wherein the compression unit comprises: a fuel supply compressor for supplying an evaporation gas to a fuel demand part using an evaporation gas as fuel; And a re-liquefying compressor for further compressing some of the evaporated gas discharged from the fuel supplying compressor and supplying the compressed liquefier to the liquefaction unit; The re-liquefaction unit comprising: a heat exchanger for exchanging heat between the evaporated gas discharged from the storage tank and the evaporated gas compressed by the re-lyzing compressor to cool the compressed evaporated gas; And first expansion means and second expansion means for expanding and cooling the compressed evaporated gas; Wherein the first expansion means is disposed upstream of the heat exchanger and the second expansion means is disposed downstream of the heat exchanger.

Wherein the fuel supply compressor is a five-stage compressor, and a part of the evaporation gas supplied to the fuel supply compressor is compressed in three stages by the fuel supply compressor and then discharged to be supplied to the first fuel demand portion, The other part of the evaporated gas supplied to the compressor for compressing the fuel may be discharged after being compressed five times in the fuel supply compressor and supplied to the second fuel demand part.

The re-liquefying compressor may be a two-stage or three-stage compressor.

The liquid remover includes a gas-liquid separator for separating the gas-liquid mixture discharged from the second expansion means into gas and liquid; As shown in FIG.

A first oil separator provided downstream of the compression unit for removing oil from the evaporated gas compressed and discharged from the compression unit; As shown in FIG.

A second oil separator for additionally removing oil from the evaporative gas supplied to the resupply unit from the evaporated gas discharged from the first oil separator; As shown in FIG.

The pressure of the evaporation gas compressed and discharged to the end of the fuel supply compressor may be 160 to 300 bar.

The pressure of the evaporation gas discharged from the fuel supply compressor may be 5 to 8 bar, or 15 to 20 bar.

A forced vaporization unit for forcibly vaporizing the liquefied gas discharged from the storage tank and supplying the liquefied gas to the compression unit; As shown in FIG.

Wherein the forced vaporization unit comprises: a forced vaporizer for forcibly vaporizing the liquefied gas discharged from the storage tank; And a mist separator for removing droplets from the forced vaporization liquefied gas discharged from the forced vaporizer; . ≪ / RTI >

The gas separated and discharged from the liquid in the gas-liquid separator may be mixed with the evaporated gas discharged from the storage tank.

The pressure of the evaporation gas discharged from the re-liquefying compressor may be 140 to 160 bar.

According to another aspect of the present invention, there is provided a method for re-liquefying an evaporation gas of a ship, the method comprising the steps of: compressing the evaporation gas discharged from a storage tank storing a liquefied gas by a compression unit for compressing the evaporation gas; And supplying the whole or a part of the compressed evaporated gas to the evaporation gas remelting unit, wherein before the compressed evaporated gas is cooled by heat exchange between the compressed evaporated gas and the evaporated gas discharged from the storage tank There is provided an evaporative gas re-liquefaction method of a ship in which the temperature of the evaporative gas supplied to the compression unit is reduced by expanding the compressed evaporative gas to pre-cool the compressed evaporative gas.

According to the present invention, in the apparatus for re-liquefying the evaporation gas in the ship, the temperature of the evaporation gas supplied to the compressor can be reduced to reduce the capacity of the compressor and improve the liquefaction performance of the evaporation gas.

1 is a configuration diagram showing an evaporative gas re-liquefying apparatus for a ship according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram showing an evaporative gas re-liquefying apparatus for a ship according to a second embodiment of the present invention.
3 is a configuration diagram showing an apparatus for liquefying a vaporized gas of a ship according to a third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention will be described with reference to the embodiments shown in the drawings, but it is to be understood that various modifications and equivalent embodiments may be made by those skilled in the art without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

The term "floating vessel" as used herein refers to floating marine floating on the sea, and includes floating marine floating on its own, propelling marine floating on one side, and barge. Should be interpreted as meaning.

1 is a configuration diagram showing an evaporative gas re-liquefying apparatus for a ship according to a first embodiment of the present invention.

As shown in FIG. 1, a storage tank 1 for storing liquefied gas is provided. Here, liquefied gas means liquefied gaseous gas at normal temperature and atmospheric pressure, such as Liquefied Natural Gas and Liquefied Petroleum Gas.

On the other hand, since it is impossible to completely insulate the inside and the outside of the storage tank, heat is continuously applied to the inside of the storage tank from the outside, thereby the liquefied gas is evaporated and a boil off gas is generated. When the evaporation gas accumulates continuously in the storage tank, various problems such as the stability problem of the storage tank may occur, so the evaporation gas is discharged from the storage tank. The present invention relates to an apparatus for re-liquefaction of such vaporized gas.

Referring to FIG. 1, the apparatus for liquefying vaporized gas of a ship according to the first embodiment of the present invention includes a remanufacturing unit 10 for re-liquefying evaporated gas discharged from a storage tank 1, And a compression unit (20) for compressing the evaporated gas. Hereinafter, the re-liquefaction unit 10 and the compression unit 20 will be described in detail.

The re-liquefying unit 10 exchanges heat between the evaporated gas discharged from the storage tank 1 and the evaporated gas compressed and discharged from the fuel supply compressor 210 to be described below, And a heat exchanger 110 for cooling the gas. The re-liquefying unit 10 includes a first expansion means 112 and a second expansion means 114 for decompressing and expanding the evaporated gas compressed and discharged by the fuel supply compressor 210 to cool it.

1, the first expansion means 112 is provided upstream of the heat exchanger 110 and the second expansion means 114 is provided downstream of the heat exchanger 110. In this case, That is, the evaporated gas compressed and discharged by the fuel supply compressor 210 is primarily expanded through the first expansion means 112, cooled, and then supplied to the heat exchanger 110. The evaporated gas cooled through the heat exchange in the heat exchanger 110 is expanded secondarily through the second expansion means 114 and cooled to be a gas-liquid mixture in a state where the gas and the liquid are mixed.

The pressure of the compressed evaporation gas supplied to the first expansion means 112 may be 270 to 330 bar and the pressure of the evaporation gas which is expanded and discharged from the first expansion means 112 may be 130 to 170 bar. For example, the pressure of the compressed evaporation gas supplied to the first expansion means 112 may be 306 bar, and the pressure of the evaporation gas which is expanded and discharged from the first expansion means 112 may be 150 bar.

The pressure of the evaporation gas supplied to the second expansion means 114 through the first expansion means 112 and the heat exchanger 110 may be 130 to 170 bar and the second expansion means 114 may be expanded The pressure of the evolved gas to be discharged may be 3 to 5 bar. For example, the pressure of the evaporation gas supplied to the second expansion means 114 may be 150 bar, and the pressure of the evaporation gas which is expanded and discharged in the second expansion means 114 may be 4 bar.

According to the first embodiment of the present invention, since the evaporation gas is firstly expanded in the first expansion means 112 provided upstream of the heat exchanger 110 and then supplied to the heat exchanger 110, The temperature of the evaporation gas supplied to the heat exchanger through the compressor is relatively low as compared with the case without the means. Therefore, since the evaporated gas discharged from the storage tank 1 is discharged in a relatively less heated state through the heat exchanger 110, the evaporated gas supplied to the fuel supplying compressor 210 through the heat exchanger 110 The temperature decreases. Therefore, there is an effect that the capacity of the fuel supply compressor 210 can be reduced.

According to the first embodiment of the present invention, compared with the case where the expansion means is provided only downstream of the heat exchanger, the expansion means provided downstream of the heat exchanger (that is, the second expansion means of the first embodiment of the present invention Since the temperature of the evaporation gas supplied to the evaporation gas remover 114 is relatively low, the overall re-liquefaction performance of the evaporation gas re-liquefaction apparatus also increases.

On the other hand, the liquefaction unit 10 in the first embodiment of the present invention further includes a gas-liquid separator 116 for separating the gas-liquid mixture discharged from the second expansion means 114 into gas and liquid. 1, the liquid separated in the gas-liquid separator 116, that is, the liquefied gas can be returned to the storage tank 1 or another storage tank, and the gas separated in the gas-liquid separator 116 is returned to the storage tank 1) and may be supplied to the heat exchanger 110 of the remelting unit 10 again.

1, the compressor unit 20 of the evaporative gas remelting apparatus of the ship according to the first embodiment of the present invention includes a fuel supply compressor (not shown) for compressing the evaporated gas discharged from the heat exchanger 110, (210). The evaporated gas compressed in the fuel supply compressor 210 is supplied to the fuel demand part 62, 64 or the remelting unit 10.

Meanwhile, the fuel supply compressor 210 according to the first embodiment of the present invention may be a multi-stage compressor. For example, the fuel supply compressor 210 may be a five-stage compressor. The pressure of the evaporative gas compressed and discharged to the end in the fuel supply compressor 210 may be 160 to 300 bar. Also, the fuel supply compressor 210 may be a centrifugal compressor. Meanwhile, if the fuel supply compressor 210 is a multi-stage compressor, an inter cooler (not shown) may be provided downstream of each stage. The intercooler is configured to cool the evaporated gas discharged from each end of the fuel supply compressor 210.

When the fuel supply compressor 210 is a five-stage compressor, the evaporated gas discharged after the three-stage compression in the fuel supply compressor 210 can be supplied to the first fuel demand section 62. When the fuel supply compressor 210 is a five-stage compressor, the evaporated gas, which is finally compressed and discharged from the fuel supply compressor 210, is supplied to the second fuel demand unit 64 or the re-liquefaction unit 10 . The first fuel demand portion 62 may be, for example, a DF (Dual fuel) engine, and the second fuel demand portion 64 may be a MEGI engine. In addition, the pressure of the evaporative gas supplied to the first fuel demand portion 62 may be 5 to 8 bar.

1, the apparatus for liquefying the vapor of a ship according to the first embodiment of the present invention includes a first oil separator (not shown) for separating oil from the evaporated gas compressed and discharged by the fuel supply compressor 210, (42) and a second oil separator (44).

When the fuel supplying compressor 210 uses the oil when the fuel supplying compressor 210 uses the oil when the evaporating gas is compressed, the evaporating gas discharged from the fuel supplying compressor 210 may be discharged together with a part of the oil . The oil separators 42 and 44 serve to separate such oil from the evaporated gas. 1, the first oil separator 42 may be provided downstream of the fuel supply compressor 210. [

On the other hand, when the evaporated gas discharged from the first oil separator 42 is supplied to the refueling unit 10, a small amount of oil may remain even though it is the evaporated gas discharged from the first oil separator 42. When evaporation gas is supplied to the refueling unit 10 together with such oil, there may arise a problem in the refueling performance of the refueling unit 10. Accordingly, the apparatus for liquefying the vaporized gas according to the first embodiment of the present invention may further include a second oil separator 44. That is, the second oil separator 44 separates the oil from the evaporated gas supplied to the refueling unit 10 among the evaporated gases discharged from the first oil separator 42. As shown in FIG. 1, the second oil separator 44 may be provided upstream of the first expansion means 112 downstream of the first oil separator 42.

1, according to the first embodiment of the present invention, some of the evaporated gas discharged from the storage tank 1 is not supplied to the fuel supply compressor 210 but is supplied through a separate line to the boosting blower 50). The evaporated gas compressed in the boosting blower 50 can be supplied to the IGG or GCU and consumed.

FIG. 2 is a configuration diagram showing an evaporative gas re-liquefying apparatus for a ship according to a second embodiment of the present invention.

2 showing the apparatus for liquefying the evaporation gas of a ship according to the second embodiment of the present invention and reference numerals denoted in Fig. 1 showing the apparatus for liquefying the evaporation gas according to the first embodiment of the present invention The same configuration and the same role. Therefore, the second embodiment of the present invention will be described mainly on the difference from the first embodiment of the present invention.

The apparatus for liquefying the evaporation gas of the ship according to the second embodiment of the present invention further comprises a compressor 212 for re-liquefaction in the compressor unit 20, unlike the evaporation gas remelting apparatus according to the first embodiment of the present invention.

The evaporative gas remelting performance of the re-liquefying unit 10 is improved as the pressure of the evaporating gas supplied to the refueling unit 10 is larger. On the other hand, since the pressure of the evaporative gas compressed and discharged by the fuel supply compressor 210 is not sufficiently high, sufficient evaporative gas remelting performance may not be exhibited when supplied to the re-liquefaction unit 10 as it is. Accordingly, in order to further compress the evaporated gas discharged from the fuel supply compressor 210 before being supplied to the re-liquefier unit 10, the evaporation gas re-liquefier according to the second embodiment of the present invention includes a re-liquefying compressor 212 ). Here, similar to the first embodiment of the present invention, the fuel supplying compressor 210 may be a centrifugal compressor.

In the evaporative gas remelting apparatus for a ship according to the second embodiment of the present invention, the pressure of the evaporative gas compressed and discharged by the fuel supply compressor 210 may be 5 to 8 bar, more specifically about 6.5 bar.

Also, the re-liquefying compressor 212 according to the second embodiment of the present invention may be a reciprocating compressor. The re-liquefying compressor 212 may be a multi-stage compressor. For example, the re-liquefying compressor 212 may be a three-stage compressor. The pressure of the evaporation gas discharged from the compressor 212 for re-liquefaction may be 100 to 200 bar. For example, the evaporation gas discharged from the compressor 212 for re-liquefaction may be 140 to 160 bar. If the re-liquefying compressor 212 is a multi-stage compressor, an intercooler (not shown) may be provided downstream of each stage. The intermediate cooler is configured to cool the evaporated gas discharged from each end of the re-liquefying compressor 212. Also, the re-liquefying compressor 212 may be a reciprocating compressor.

In the apparatus for liquefying the vaporized gas of the ship according to the second embodiment of the present invention, some of the evaporated gas discharged after being compressed by the fuel supplying compressor 210 is supplied to the re-liquefying compressor 212, Can be supplied to the liquefaction unit (10). Further, another portion of the evaporated gas discharged after being compressed by the fuel supply compressor 210 may be supplied to the fuel demand portion 60 which uses the evaporated gas as fuel. For example, the fuel demand section 60 may be a DF engine.

Meanwhile, in the second embodiment of the present invention, the pressure of the evaporation gas supplied to the first expansion means 112 after being compressed by the re-liquefying compressor 212 may be 130 to 170 bar, the first expansion means 112, The pressure of the evaporated gas that is expanded and discharged from the evaporator may be 90 to 110 bar. For example, the pressure of the evaporation gas supplied to the first expansion means 112 may be 150 bar, and the pressure of the evaporation gas that is expanded and discharged from the first expansion means 112 may be 100 bar.

The pressure of the evaporation gas supplied to the second expansion means 114 through the first expansion means 112 and the heat exchanger 110 may be 90 to 110 bar and is expanded at the second expansion means 114 The pressure of the evolved gas to be discharged may be 3 to 5 bar. For example, the pressure of the evaporation gas supplied to the second expansion means 114 may be 100 bar, and the pressure of the evaporation gas which is expanded and discharged from the second expansion means 114 may be 4 bar.

2, the apparatus for liquefying the evaporation gas of a ship according to the second embodiment of the present invention further includes a forced vaporization unit 30 for forcibly vaporizing the liquefied gas discharged from the storage tank 1 .

When the amount of the evaporation gas required in the fuel demand unit 60 or the like exceeds the amount of the evaporation gas naturally occurring in the storage tank 1, the liquefied gas stored in the storage tank 1 is forcibly vaporized It is necessary to supply fuel to the customer. For this purpose, according to the second embodiment of the present invention, the forced vaporization unit 30 may be provided.

The forced vaporizing unit 30 according to the second embodiment of the present invention is constructed by a forced vaporizer 310 for forcibly vaporizing the liquefied gas discharged from the storage tank 1 and a vaporizer and a mist separator 312 for separating the droplets.

Even if the liquefied gas is vaporized in the forced vaporizer 310 to be an evaporated gas, a liquid state liquid droplet sometimes exists between the evaporated gases. If such a droplet is supplied to the compressor, the performance of the compressor may be deteriorated or the compressor may be damaged. In order to prevent this, a mist separator 312 may be provided. The forced vaporized gas that has passed through the mist separator 312 is supplied to the fuel supply compressor 210 together with the evaporated gas naturally evaporated in the storage tank 1, and can be subjected to the above-described process.

According to the second embodiment of the present invention, the evaporation gas is primarily expanded in the first expansion means 112 provided upstream of the heat exchanger 110, and then the heat exchanger 110 The temperature of the evaporation gas supplied to the heat exchanger is relatively low as compared with the case where no expansion means is provided upstream of the heat exchanger. Therefore, since the evaporated gas discharged from the storage tank 1 is discharged in a relatively less heated state through the heat exchanger 110, the evaporated gas supplied to the fuel supplying compressor 210 through the heat exchanger 110 The temperature decreases. Therefore, there is an effect that the capacity of the fuel supply compressor 210 can be reduced.

Further, according to the second embodiment of the present invention, compared to the case where the expansion means is provided only downstream of the heat exchanger, the expansion means provided downstream of the heat exchanger (that is, the second expansion means (114) is relatively low, the overall re-liquefaction efficiency of the evaporative gas remelting device is also increased.

3 is a configuration diagram showing an apparatus for liquefying a vaporized gas of a ship according to a third embodiment of the present invention.

3 showing the apparatus for liquefying the evaporation gas of the ship according to the third embodiment of the present invention, the apparatus for liquefying the evaporation gas according to the first embodiment of the present invention and the apparatus for liquefying the evaporation gas according to the second embodiment of the present invention 1 and 2 showing the evaporation gas re-liquefying apparatus respectively have the same constitution and the same role. Therefore, the second embodiment of the present invention will be described mainly on the difference from the first embodiment of the present invention.

Referring to FIG. 3, the apparatus for liquefying the evaporation gas of a ship according to the third embodiment of the present invention may include a compressor 212 for re-liquefaction, similar to the apparatus for liquefying evaporated gas according to the second embodiment of the present invention , And the re-liquefying compressor 212 may be a multi-stage compressor.

The pressure of the evaporation gas discharged from the compressor 212 for re-liquefaction may be 100 to 200 bar. For example, the evaporation gas discharged from the compressor 212 for re-liquefaction may be 140 to 160 bar. If the re-liquefying compressor 212 is a multi-stage compressor, an intercooler (not shown) may be provided downstream of each stage. The intermediate cooler is configured to cool the evaporated gas discharged from each end of the re-liquefying compressor 212.

However, in the apparatus for liquefying the evaporation gas of the ship according to the third embodiment of the present invention, the re-liquefying compressor 212 may be a two-stage compressor, unlike the evaporating gas re-liquefying apparatus according to the second embodiment of the present invention.

The pressure of the evaporation gas discharged from the fuel supply compressor 210 according to the third embodiment of the present invention is higher than the pressure of the evaporation gas discharged from the fuel supply compressor according to the second embodiment of the present invention. Therefore, unlike the second embodiment of the present invention, even if the re-liquefying compressor 212 is provided as a two-stage compressor, the re-liquefaction performance of the evaporation gas can be exhibited. At this time, among the evaporated gas discharged from the fuel supply compressor 210, the evaporated gas not supplied to the re-liquefying compressor 212 may be supplied to the fuel demand section 60. The pressure of the evaporative gas supplied to the fuel demand section 60 may be 15 to 20 bar, more specifically about 17 bar.

Meanwhile, in the third embodiment of the present invention, the pressure of the evaporation gas supplied to the first expansion means 112 after being compressed by the re-liquefying compressor 212 may be 130 to 170 bar, and the first expansion means 112, The pressure of the evaporated gas that is expanded and discharged from the evaporator may be 90 to 110 bar. For example, the pressure of the evaporation gas supplied to the first expansion means 112 may be 150 bar, and the pressure of the evaporation gas that is expanded and discharged from the first expansion means 112 may be 100 bar.

The pressure of the evaporation gas supplied to the second expansion means 114 through the first expansion means 112 and the heat exchanger 110 may be 90 to 110 bar and is expanded at the second expansion means 114 The pressure of the evolved gas to be discharged may be 3 to 5 bar. For example, the pressure of the evaporation gas supplied to the second expansion means 114 may be 100 bar, and the pressure of the evaporation gas which is expanded and discharged from the second expansion means 114 may be 4 bar.

Except for the re-liquefying compressor 212, the effect of the evaporation gas re-liquefier according to the third embodiment of the present invention is similar to that of the evaporation gas re-liquefier according to the second embodiment of the present invention. Therefore, the capacity of the fuel supply compressor 210 can be reduced, and the overall re-liquefaction efficiency of the evaporative gas remelting device also increases.

1 - Storage tank
10 - Re-liquefying unit
20 - compression unit
30 - forced vaporization unit
42 - first oil separator
44 - second oil separator
50 - Boosting blower
60 - Fuel Demand Department
62 - First fuel demand unit
64 - Second fuel demand unit
110 - Heat Exchanger
112 - a first expansion means
114 - a second expansion means
116 - gas-liquid separator
210 - Compressor for fuel supply
212 - Re-liquefying compressor
310 - forced vaporizer
312 - Mist separator

Claims (15)

A storage tank for storing liquefied gas; A compression unit including a plurality of fuel supply compressors and an intercooler for compressing the evaporated gas discharged from the storage tank; And a re-liquefaction unit for re-liquefying the evaporated gas discharged from the compression unit, the apparatus comprising:
The re-liquefying unit includes:
A heat exchanger for exchanging heat between the evaporated gas discharged from the storage tank and the evaporated gas compressed by the compression unit to cool the compressed evaporated gas;
A first expansion means provided upstream of the heat exchanger; And
And a second expansion means provided downstream of the heat exchanger,
So that the evaporation gas passing through the compression unit is expanded by the first expansion means and then cooled by the heat exchanger. The method according to claim 1,
Some of the evaporated gas supplied to the compression unit is discharged during the multi-stage compression and supplied to the first fuel demand unit,
Wherein another part of the evaporated gas supplied to the compression unit is supplied to the second fuel demand part after completing the multistage compression process. The method according to claim 1,
The compression unit includes:
Further comprising a re-liquefying compressor for further compressing a part of the evaporated gas compressed by the plurality of fuel supply compressors and supplying the compressed liquefier to the re-liquefaction unit,
Wherein the evaporation gas that has passed through the plurality of fuel supply compressors and the plurality of intermediate coolers is further compressed by the compressor for re-liquefaction and then expanded by the first expansion means. The method of claim 2,
Wherein the compression unit includes five fuel supply compressors,
Some of the evaporated gas supplied to the compression unit is compressed after being compressed in three stages and supplied to the first fuel demand unit,
Wherein another part of the evaporated gas supplied to the compression unit is compressed after being compressed in five stages and supplied to the second fuel demand unit. The method of claim 3,
Wherein the re-liquefying compressor is a two-stage or three-stage compressor,
Apparatus for liquefying evaporation gas of ship. The method according to any one of claims 1 to 5,
Wherein the re-liquefaction unit further comprises a gas-liquid separator for separating the gas-liquid mixture discharged from the second expansion means into gas and liquid. The method according to any one of claims 1 to 5,
Further comprising: a first oil separator provided downstream of the compression unit for removing oil from the evaporated gas compressed and discharged from the compression unit. The method of claim 7,
A second oil separator for additionally removing oil from the evaporative gas supplied to the resupply unit from the evaporated gas discharged from the first oil separator; ≪ / RTI >
Apparatus for liquefying evaporation gas of ship. The method according to claim 1,
Wherein the pressure of the evaporation gas after the compression process of the plurality of fuel supply compressors is 160 to 300 bar. The method of claim 3,
Wherein the pressure of the evaporation gas subjected to the compression process of the plurality of fuel supply compressors is 5 to 8 bar or 15 to 20 bar. The method according to any one of claims 1 to 5,
Further comprising a forced vaporizing unit for forcibly vaporizing the liquefied gas discharged from the storage tank and supplying the liquefied gas to the compression unit. The method of claim 11,
Wherein the forced vaporization unit comprises:
A forced vaporizer for forcibly vaporizing the liquefied gas discharged from the storage tank; And
A mist separator for removing droplets from the forced vaporizing liquefied gas discharged from the forced vaporizer; / RTI >
Apparatus for liquefying evaporation gas of ship. The method of claim 6,
Wherein the gas separated and discharged from the liquid in the gas-liquid separator is mixed with the evaporated gas discharged from the storage tank,
Apparatus for liquefying evaporation gas of ship. The method of claim 3,
Wherein the pressure of the evaporation gas discharged from the compressor for re-liquefaction is 140 to 160 bar,
Apparatus for liquefying evaporation gas of ship. delete
KR1020150126277A 2015-09-07 2015-09-07 Device for re-liquefaction of BOG of floating vessel KR101767551B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150126277A KR101767551B1 (en) 2015-09-07 2015-09-07 Device for re-liquefaction of BOG of floating vessel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150126277A KR101767551B1 (en) 2015-09-07 2015-09-07 Device for re-liquefaction of BOG of floating vessel

Publications (2)

Publication Number Publication Date
KR20170029228A KR20170029228A (en) 2017-03-15
KR101767551B1 true KR101767551B1 (en) 2017-08-11

Family

ID=58403117

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150126277A KR101767551B1 (en) 2015-09-07 2015-09-07 Device for re-liquefaction of BOG of floating vessel

Country Status (1)

Country Link
KR (1) KR101767551B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190080364A (en) * 2017-12-28 2019-07-08 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method of Discharging lubrication Oil in the Same
KR20190109828A (en) * 2018-03-19 2019-09-27 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957320B1 (en) * 2017-08-24 2019-03-12 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101106088B1 (en) * 2011-03-22 2012-01-18 대우조선해양 주식회사 Non-flammable mixed refrigerant using for reliquifaction apparatus in system for supplying fuel for high pressure natural gas injection engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101106088B1 (en) * 2011-03-22 2012-01-18 대우조선해양 주식회사 Non-flammable mixed refrigerant using for reliquifaction apparatus in system for supplying fuel for high pressure natural gas injection engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190080364A (en) * 2017-12-28 2019-07-08 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method of Discharging lubrication Oil in the Same
KR102020967B1 (en) * 2017-12-28 2019-09-11 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method of Discharging lubrication Oil in the Same
KR20190109828A (en) * 2018-03-19 2019-09-27 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel
KR102044271B1 (en) * 2018-03-19 2019-11-13 대우조선해양 주식회사 Boil-Off Gas Reliquefaction System and Method for Vessel

Also Published As

Publication number Publication date
KR20170029228A (en) 2017-03-15

Similar Documents

Publication Publication Date Title
KR101827100B1 (en) Integrated methane refrigeration system for liquefying natural gas
KR101722597B1 (en) Reliquefaction System And Method For Boil Off Gas
KR101710341B1 (en) Method of cooling boil off gas and an apparatus therefor
KR101617021B1 (en) Fuel gas supply system
JP6934885B2 (en) Evaporative gas reliquefaction device and evaporative gas reliquefaction method
KR101742284B1 (en) Boil Off Gas Treatment System
KR101593970B1 (en) BOG Multi-Step Reliquefaction System And Method For Boiled Off Gas
KR101751860B1 (en) Reliquefaction System And Method For Boil Off Gas
KR101447511B1 (en) Fuel gas supplying system
KR101191240B1 (en) Fuel gas supplying system
KR101742285B1 (en) BOG Re-liquefaction Apparatus and Method for Vessel
KR101767551B1 (en) Device for re-liquefaction of BOG of floating vessel
KR101675879B1 (en) Device and method for re-liquefying BOG
KR20170120858A (en) Vessel
KR101867033B1 (en) BOG Reliquefaction System and Method for Vessel
KR200493118Y1 (en) Reliquefaction System of BOG for Ship
KR101537277B1 (en) Fuel gas supplying system
KR101675878B1 (en) Device and method for re-liquefying BOG
KR101739985B1 (en) BOG Re-liquefaction Apparatus and Method for Vessel
KR102276362B1 (en) Boil-off Gas Reliquefaction System and Method
KR20170000180A (en) Device and method for BOG re-liquefaction
KR101858510B1 (en) Boil-Off Gas Re-liquefaction System and Method
KR101686513B1 (en) Device and method for BOG re-liquefaction
KR102248130B1 (en) Boil-Off Gas Reliquefaction System and Method for a Vessel
KR101623171B1 (en) BOG Reliquefaction System

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant