KR101853044B1 - Three Phase Separator and BOG Re-liquefaction System including the Separator - Google Patents

Three Phase Separator and BOG Re-liquefaction System including the Separator Download PDF

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KR101853044B1
KR101853044B1 KR1020160104146A KR20160104146A KR101853044B1 KR 101853044 B1 KR101853044 B1 KR 101853044B1 KR 1020160104146 A KR1020160104146 A KR 1020160104146A KR 20160104146 A KR20160104146 A KR 20160104146A KR 101853044 B1 KR101853044 B1 KR 101853044B1
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South Korea
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gas
phase separator
liquid
phase
liquefied
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KR1020160104146A
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Korean (ko)
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KR20180019883A (en
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손수정
류승각
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대우조선해양 주식회사
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    • 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
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • 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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • 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
    • 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
    • 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
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/10—Processes or apparatus using other separation and/or other processing means using combined expansion and separation, e.g. in a vortex tube, "Ranque tube" or a "cyclonic fluid separator", i.e. combination of an isentropic nozzle and a cyclonic separator; Centrifugal separation
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/20—Processes or apparatus using other separation and/or other processing means using solidification of components
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/62—Ethane or ethylene
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/02—Separating impurities in general from the feed stream
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/72—Processing device is used off-shore, e.g. on a platform or floating on a ship or barge

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

Abstract

The present invention relates to a three-phase separator for recovering cold heat of an evaporation gas to heat-exchange the evaporation gas, separating the re-liquefied liquid evaporation gas contained in the discharged stream after the heat exchange, a flash gas and a lubricating oil component, Liquefaction system.
The evaporation gas re-liquefaction system including the three-phase separator according to the present invention comprises a multi-stage compressor for compressing the evaporation gas discharged from a liquefied gas storage tank provided in a ship or an offshore structure to a high pressure; A heat exchanger for exchanging the compressed evaporated gas compressed by the multi-stage compressor with the evaporated gas discharged from the liquefied gas storage tank to cool the compressed evaporated gas; Expanding means for decompressing and cooling the cooled evaporated gas to form a gas-liquid mixture; And a three-phase separator for separating the gas-liquid mixture into gas phase, liquid phase condensate and lube oil in a three-phase separator, wherein the liquid state condensate separated from the gas and lubricating oil is supplied to the liquefied gas storage tank .

Description

[0001] The present invention relates to a three-phase separator and a three-phase separator,

The present invention relates to a three-phase separator for recovering cold heat of an evaporation gas to heat-exchange the evaporation gas, separating the re-liquefied liquid evaporation gas contained in the discharged stream after the heat exchange, a flash gas and a lubricating oil component, Liquefaction system.

In the case of transporting a gas containing a hydrocarbon as a main component through the sea, it is necessary to liquefy the gas because it becomes too bulky when it is transported in a gaseous state.

In order to prevent the liquefied gas from evaporating due to heat exchange with the outside, various kinds of heat insulating structures are provided in the tank for storing the liquefied gas in the liquefied gas transportation line for transporting the liquefied gas.

However, since it is impossible to completely insulate from the outside, evaporation of the liquefied gas is constantly generated inside the tank storing the liquefied gas. The evaporated liquefied gas is called the boil off gas. When the evaporation gas accumulates in the tank, the pressure inside the tank increases and the generation of the evaporation gas is further accelerated. Therefore, it is necessary to discharge the evaporation gas to the outside or re-liquefy and return to the tank again.

Korean Patent Publication No. 10-2014-0075594 (published on June 19, 2014)

As a method of liquefying the evaporation gas, there is a method of liquefying the evaporation gas by transferring cold heat to the evaporation gas by using a separate refrigerant such as nitrogen, a method of recovering the cold heat of the evaporation gas without re- . Particularly, the method of reclaiming the evaporation gas by recovering the cold heat of the evaporation gas without the separate refrigerant can reduce the facilities for evaporating the gas re-liquefaction and can reduce the energy consumption required for liquefaction of the evaporation gas .

The evaporative gas re-liquefaction system for recovering the cold and hot of the evaporated gas to re-liquefy the evaporated gas generally includes a multi-stage compressor for compressing the evaporated gas to a high pressure of about 300 bar or more. The piston ring of the cylinder is worn Therefore, for example, if the evaporation gas is compressed in 5 stages, the 4th and 5th stage compressor cylinders should be supplied with oil and lubricating oil to prevent wear of the pistons. Therefore, the evaporated gas compressed by four or more stages using such a multi-stage compressor may contain lubricating oil, and when the lubricating oil is fed together into the liquefied gas storage tank, it is extremely fatal. Therefore, an oil separator must be provided at the downstream of the multi- do.

Accordingly, it is an object of the present invention to provide a three-phase separator and a vaporization gas re-liquefaction system including the three-phase separator, which prevent liquefied oil from being mixed into evaporation gas that is re-liquefied and recovered into a storage tank.

According to an aspect of the present invention, there is provided a multi-stage compressor comprising: a multi-stage compressor for compressing an evaporated gas discharged from a liquefied gas storage tank provided in a ship or an offshore structure to a high pressure; A heat exchanger for exchanging the compressed evaporated gas compressed by the multi-stage compressor with the evaporated gas discharged from the liquefied gas storage tank to cool the compressed evaporated gas; Expanding means for decompressing and cooling the cooled evaporated gas to form a gas-liquid mixture; And a three-phase separator for three-phase separation of the gas-liquid mixture into gaseous liquid, condensate and liquid lubricant in a gaseous state, and a three-phase separator for separating the gaseous liquid mixture from the liquid state condensate, Wherein the three-phase separator is a three-phase separator.

Preferably, the three-phase separator further comprises: a cyclone for providing a rotational force to the fluid flowing into the three-phase separator; A liquid outlet for discharging the separated liquid phase; A gas outlet for discharging the separated gas phase; And a solid outlet for discharging the separated solid particles.

Preferably, the three-phase separator is provided with a mixture inlet for introducing the gas-liquid mixture, and the mixture inlet may be positioned such that the gas-liquid mixture flows in a tangential direction of the three-phase separator.

Preferably, the lower portion of the three-phase separator is provided in a concave shape, and the gas outlet is provided at an upper portion of the three-phase separator, the solid outlet is provided at a lower central portion of the three-phase separator, And may be provided on the left side or the lower right side of the three-phase separator.

Preferably, the gas discharge line connecting the gas outlet and the low temperature side supply portion of the heat exchanger; And a solid discharge line connecting the solid outlet and the lubricant storage tank, the pressure control valve being provided in the gas discharge line; And a drain valve provided in the solid discharge line.

Preferably, the level measuring unit measures the level of the three-phase separator; And a level control valve connected to the liquid outlet and provided in a liquid discharge line controlled in conjunction with the level measurement unit.

According to another aspect of the present invention, A cyclone provided inside the body; A mixture inlet for providing a swirling flow of the mixed fluid introduced into the cyclone; A gas outlet for discharging the gas separated from the mixed fluid; A liquid outlet for discharging the liquid separated from the mixed fluid; And a solid outlet for discharging a mixture or solid of solid and liquid separated from the mixed fluid, wherein the mixed fluid flowing into the cyclone is a three-phase mixture of a re-liquid evaporating gas, a flash gas and a lubricating oil A three-phase separator is provided.

Preferably, the cyclone is provided in a cylindrical shape having an inclined surface at the bottom, the mixture inlet is provided in a tangential direction to a side portion of the cyclone, the gas outlet is provided in the central portion of the cyclone, And a solid-liquid mixture or solid is discharged along an inclined surface of the cyclone, and the liquid discharge port may be provided above or at the side of the solid discharge port.

The apparatus may further include a demister disposed at an upper portion of the cyclone to filter the fluid having a density higher than that of the exhausted gas.

The three-phase separator according to the present invention and the evaporation gas re-liquefaction system including the three-phase separator according to the present invention separate the re-liquefied evaporated gas into the liquefied gas storage tank, separate the remaining flash gas from the liquefied gas, Can supply.

In addition, it is possible to separate the lubricating oil from the liquefied and non-liquefied flash gas, thus preventing the liquefied gas storage tank from being mixed with the lubricating oil.

In addition, it is possible to effectively separate the re-liquefied evaporated gas and the gaseous flash gas while minimizing the apparatus change of the conventional gas-liquid separator in the conventional evaporation gas remelting system, and also can separate the lubricating oil easily, .

FIG. 1 is a schematic view illustrating an evaporative gas re-liquefaction system including a three-phase separator according to an embodiment of the present invention.

In order to fully understand the operational advantages of the present invention and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which illustrate preferred embodiments of the present invention, and to the contents of the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. The same elements are denoted by the same reference numerals even though they are shown in different drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

FIG. 1 is a schematic view illustrating an evaporative gas re-liquefaction system including a three-phase separator according to an embodiment of the present invention. Hereinafter, a three-phase separator and an evaporation gas re-liquefaction system including the three-phase separator according to an embodiment of the present invention will be described with reference to FIG.

Herein, the liquefied gas may refer to any liquid cargo or gaseous fuel that is generally stored in a liquid state such as LNG, LPG, LEG (Liquefied Ethane Gas), etc., and the Boil Off Gas (BOG) Is generated by natural vaporization.

In addition, the evaporation gas remelting system including the three-phase separator of the present invention can be applied to all types of ships or marine structures having liquefied gas storage tanks, such as LNG carriers, LNG RVs, LNG FPSO, LNG It can be applied to marine plants such as FSRU.

The evaporation gas re-liquefaction system including the three-phase separator according to an embodiment of the present invention includes a multi-stage compressor (Multi) compressor for discharging evaporation gas generated in a liquefied gas storage tank (not shown) (Not shown), and the compressed evaporation gas compressed in the multi-stage compressor and the evaporation gas discharged from the liquefied gas storage tank to be introduced into the multi-stage compressor are heat-exchanged and evaporated from the liquefied gas storage tank into the multi- Expansion means (JTV) for forming a vapor-liquid mixture by at least partially liquefying the vaporized gas cooled in the heat exchanger (100) by cooling the vaporized gas cooled by the heat exchanger (100) Phase separator 200 for three-phase separation of the mixture into gas, liquid and solid.

According to the embodiment of the present invention, the number of stages of the multi-stage compressor is not particularly limited, but the present embodiment will exemplify the case where the multi-stage compressor is provided in five stages.

According to one embodiment of the present invention, in the multi-stage compressor, the evaporation gas discharged from the liquefied gas storage tank is compressed in five steps. As the compressor moves to the high stage, that is, in the four- Oil must be supplied. However, such a lubricating oil is likely to be introduced into the compressed evaporative gas, and when the lubricating oil is mixed with the compressed evaporative gas and supplied to the liquefied gas storage tank together with the liquefied evaporative gas, it becomes a critical risk. A process of separating the lubricating oil from the evaporation gas is indispensable.

Conventionally, an oil separator or a crescent filter for removing the oil contained in the compressed evaporative gas is additionally provided before introducing the compressed evaporative gas compressed in the multi-stage compressor into the heat exchanger. However, in an embodiment of the present invention, Phase separator 200 is provided at the rear end of the heat exchanger 100 and the expansion means JTV together with the oil separating means or separately so that the gaseous flash gas contained in the gas-liquid mixture and the condensate in the liquid state, And the three-phase separation of the re-liquefied evaporative gas and the lubricating oil.

The three-phase separator 200 according to an embodiment of the present invention includes a main body that forms a space, a vaporized gas that has been re-liquefied through the multi-stage compressor, the heat exchanger 100, and the expansion means (JTV) Phase mixture is supplied to the three-phase separator 200 and the mixed fluid introduced into the mixture inlet MI is supplied to the three-phase separator 200 so that the mixed fluid is circulated (Cyclone) 210 for indicating a flow.

In addition, the three-phase separator 200 according to an embodiment of the present invention includes a liquid outlet LO for discharging a condensate in a separated liquid state, a gas outlet (not shown) for discharging a gaseous flash gas GO) and a solid outlet (OO) for discharging a mixture of solid or liquid and solid, for example, slurry-containing Lube Oil including solid particles.

It is preferable that the mixture inlet MI is positioned such that the mixed fluid flows in the tangential direction of the three-phase separator 200, thereby ensuring the cyclone effect. The mixed fluid flowing into the cyclone 210 represents a swirling flow. A mixture of liquid and solid, that is, a mixture of a liquid and a solid, which is rotating along the wall surface of the cyclone 210, is separated from the gas and the liquid while descending to the bottom of the cyclone 210, The solid particles collected in the lower central portion of the cyclone 210 due to gravity are discharged through the solid outlet OL.

A multi-stage compressor, a heat exchanger 100 and an expansion means (JTV) are provided in the mixture supply line ML, and the evaporation gas discharged from the storage tank is supplied to the mixture inlet ML. Is compressed along the feed line (ML), cooled and decompressed to produce a mixed fluid, and the resulting mixed fluid is fed to the mixture inlet (MI).

The expansion means (JTV) may be a line-thrombone valve as shown in FIG. 1, but is not limited thereto. The type of the expansion means (JTV) is not particularly limited as long as it can decompress and cool the evaporation gas to at least partially liquefy .

That is, the lower portion of the cyclone 210 in the three-phase separator 200, particularly the three-phase separator 200 according to the embodiment of the present invention, is provided so as to be inclined downward and the central portion of the lower portion is recessed, A solid outlet OO is provided in the concave central portion of the lower portion of the cyclone 210 and a solid outlet line OL is provided in the solid outlet OO, Phase separator 200 to the lubricant storage tank (LO tank), which is separated and discharged from the mixed fluid in the three-phase separator 200. The solid discharge line OL is provided with a drain valve VV2, The opening and closing of the OL can be controlled.

The mixed fluid introduced in the tangential direction of the cyclone 210 forms a swirling flow along the wall surface of the cyclone 210. The lubricating oil component is extracted into the inner wall while flowing along the wall surface of the cyclone 210, It is gathered in the concave central part. Accordingly, the liquid outlet LO may be located above the solid outlet OO so that the separated lubricant component is not incorporated into the separated liquid stream, i.e., the outlet of the three-phase separator 200 May be provided on the side.

A liquid discharge line (LL) is connected to the liquid outlet (LO) to transfer the liquid condensate separated from the mixed fluid in the three-phase separator (220), the re-liquefied evaporated gas to the liquefied gas storage tank. The liquid discharge line LL is provided with a level control valve LCV1 to control the opening and closing of the liquid discharge line LL.

Phase separator 220 according to an exemplary embodiment of the present invention further includes a level measuring unit LIT to measure a liquid level of the three-phase separator 220. The control unit, not shown, The opening and closing of the level control valve LCV1 can be controlled.

Preferably, when the level of the three-phase separator 220 measured by the level measuring unit LIT reaches a preset value or more, the control unit first controls the drain valve VV2 of the solid discharge line OL To release the separated lubricating oil. When all of the lubricating oil is discharged, the level control valve (LCV1) of the liquid discharge line (LL) can be opened to discharge the separated re-liquefied evaporated gas. The separated lubrication oil is discharged first and then the re-liquefied evaporated gas is supplied to the liquefied gas storage tank to further prevent the lubricating oil from being mixed into the re-liquefied evaporated gas supplied to the storage tank.

According to one embodiment of the present invention, the gas outlet GO may be provided at the top of the three-phase separator 200. As described above, the mixed fluid forms a swirling flow and the re-liquefied evaporated gas and the lubricating oil component are separated along the inner wall surface of the cyclone 210. In the central space of the cyclone 210, That is, the flash gas is moved upward, discharged through the gas outlet GO provided at the upper part, and supplied to the heat exchanger 100 along the gas discharge line GL connected to the gas outlet GO.

The flash gas separated and discharged from the mixed fluid in the three-phase separator 200 may be introduced into the low temperature side inlet of the heat exchanger 100. In the heat exchanger 100, the evaporation gas discharged from the liquefied gas storage tank and the compressed evaporation gas compressed by the multi-stage compressor are heat-exchanged as described above, and the compressed evaporation gas is cooled by the cold heat of the evaporation gas discharged from the storage tank. The flash gas separated by the three-phase separator 200 may be supplied together with the evaporation gas discharged from the storage tank into the inlet of the evaporation gas discharged from the storage tank providing the cold heat, that is, the low temperature inlet.

The non-re-liquefied gaseous flash gas separated in the three-phase separator 200 may be re-liquefied by introducing it into the multi-stage compressor as described above, or may be supplied as fuel for the engine provided on the ship.

According to an embodiment of the present invention, the three-phase separator 200 has a density higher than that of the gas so that a liquid or a solid state fluid is not mixed into the gas discharged to the gas outlet GO above the cyclone 200 A further Demister 220 may be provided to filter out a larger fluid.

The gas discharge line GL is provided with a pressure control valve PCV which opens the pressure control valve PCV when the pressure of the three-phase separator 200 becomes equal to or higher than a preset value, (100). Alternatively, the pressure control valve PCV may be automatically controlled to be automatically opened and closed when the pressure is higher than a predetermined pressure.

As described above, the evaporation gas remelting system including the three-phase separator according to an embodiment of the present invention is characterized in that the three-phase separator is provided at the downstream of the multi-stage compressor, the heat exchanger and the expansion means, Phase separator is capable of further separating not only the gas-liquid separation such as flash gas and condensate but also the lubricating oil, and in the re-liquefaction process of the evaporation gas, Role can also be.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. . Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and thus the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100: heat exchanger
200: Three phase separator
MI: mixture inlet
OO: solid outlet
LO: liquid outlet
GO: gas outlet

Claims (9)

A multi-stage compressor for compressing the evaporated gas discharged from a liquefied gas storage tank provided in a ship or an offshore structure to a high pressure;
A heat exchanger for exchanging the compressed evaporated gas compressed by the multi-stage compressor with the evaporated gas discharged from the liquefied gas storage tank to cool the compressed evaporated gas;
Expanding means for decompressing and cooling the cooled evaporated gas to form a gas-liquid mixture; And
Phase separator for three-phase separation of the gas-liquid mixture with a gaseous gas, a condensate in a liquid state and a lubricating oil,
The condensate in a liquid state in which the gas and the lubricating oil are separated is supplied to the liquefied gas storage tank,
In the three-phase separator,
A gas discharge line connecting the gas outlet for discharging the gas phase separated from the three-phase separator and the low temperature side supply portion of the heat exchanger; And
A solid discharge line connecting a solid outlet for discharging the solid particles separated from the three-phase separator to a lubricant storage tank,
A pressure control valve provided in the gas discharge line; And
And a drain valve provided in said solid discharge line. ≪ Desc / Clms Page number 13 > The method according to claim 1,
In the three-phase separator,
A cyclone for providing rotational force to the fluid flowing into the three-phase separator; And
And a liquid outlet for discharging the separated liquid phase. The method of claim 2,
In the three-phase separator,
A mixture inlet for introducing the gas-liquid mixture,
Wherein the mixture inlet is positioned such that the gas-liquid mixture enters the tangential direction of the three-phase separator. The method of claim 3,
The lower part of the three-phase separator is provided in a concave shape,
The gas outlet is provided in the upper part of the three-phase separator,
The solid outlet is provided in a lower central portion of the three-phase separator,
Wherein the liquid outlet is provided on the left or right lower side of the three-phase separator. delete The method of claim 2,
A level measuring unit for measuring a level of the three-phase separator; And
And a level control valve connected to the liquid outlet and provided in a liquid discharge line controlled in conjunction with the level measurement unit.
delete delete delete
KR1020160104146A 2016-08-17 2016-08-17 Three Phase Separator and BOG Re-liquefaction System including the Separator KR101853044B1 (en)

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