CN1808027A - Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas - Google Patents
Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas Download PDFInfo
- Publication number
- CN1808027A CN1808027A CNA2005100855890A CN200510085589A CN1808027A CN 1808027 A CN1808027 A CN 1808027A CN A2005100855890 A CNA2005100855890 A CN A2005100855890A CN 200510085589 A CN200510085589 A CN 200510085589A CN 1808027 A CN1808027 A CN 1808027A
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- Prior art keywords
- liquefied natural
- natural gas
- phase separator
- gas phase
- pipeline
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 138
- 239000007789 gas Substances 0.000 title claims abstract description 110
- 238000001816 cooling Methods 0.000 title abstract 2
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 14
- 239000013526 supercooled liquid Substances 0.000 claims description 12
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004781 supercooling Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
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- 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
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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
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- 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"
- F25J1/0045—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 vaporising a liquid return stream
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- 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
- F25J1/0203—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 using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0208—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 using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop
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- 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
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- 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.
- F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
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- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
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- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
- F25J3/04975—Construction and layout of air fractionation equipments, e.g. valves, machines adapted for special use of the air fractionation unit, e.g. transportable devices by truck or small scale use
- F25J3/04987—Construction and layout of air fractionation equipments, e.g. valves, machines adapted for special use of the air fractionation unit, e.g. transportable devices by truck or small scale use for offshore use
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- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/04—Mixing or blending of fluids with the feed stream
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- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/42—Nitrogen
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- 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
- F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
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- 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
- F25J2270/00—Refrigeration techniques used
- F25J2270/02—Internal refrigeration with liquid vaporising loop
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- 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
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
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- 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
- F25J2280/00—Control of the process or apparatus
- F25J2280/02—Control in general, load changes, different modes ("runs"), measurements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ocean & Marine Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an operation system for an LNG carrier which liquefies vaporized gas through super-cooling. The operation system comprises a vaporized gas compressor, a low temperature heat exchanger connected with a cooling system, a first check valve and a first pressure control valve which are installed on a pipe between a liquefied natural gas phase separator and a gas combustion cell, a second check valve and a second pressure control valve which are installed on a pipe parallel to the pipe on which the first check valve and the first pressure control valve are installed. The parallel pipes are connected with a pipe between the vaporized gas compressor and the low temperature heat exchanger so as to deliver vaporized gas to a steam area above the liquefied natural gas phase separator. So, in this way, the pressure and the liquid level of the liquefied natural gas phase separator is steadily under control, which effectively reduces power consumption and brings economic effects.
Description
Technical field
The present invention relates to a kind of operating system that was used for the LNG carrier of cold-peace liquefaction boil-off gas, relate more specifically to a kind of like this operating system that was used for the LNG carrier of cold-peace liquefaction boil-off gas, the liquefaction system again of the boil-off gas in this operating system in the LNG carrier is improved to a kind of cold-peace liquefaction structure of crossing efficiently, so that power consumption reduces, simplified control and can obtain economic benefit.
Background technology
Usually, utilize and be installed on the compressor of LNG carrier and the liquefaction system again of motor room, the boil-off gas (BOG) that cargo hold produced is liquefied as liquefied natural gas (LNG) again, and the boil-off gas that will liquefy again is back to cargo hold.
In the liquefaction system several basic operating systems are arranged again at this, as partial liquefaction, saturated liquefaction, supercooled liquidization etc.Consider that from power consumption, aspect such as simplify the operation supercooled liquidization is better than other system, and the invention provides a kind of more supercooled liquid operating system of the boil-off gas of efficient configuration that has.
Summary of the invention
Therefore, the present invention's consideration of being based on above-mentioned and/or other problems is made.The object of the present invention is to provide a kind of operating system that was used for the LNG carrier of cold-peace liquefaction boil-off gas, in this operating system, the liquefaction system again of boil-off gas is improved to a kind of cold-peace liquefaction structure of crossing efficiently in the LNG carrier, power consumption is reduced, simplified control and can obtain economic benefit.
According to the present invention, above-mentioned and other purpose can realize that this operating system comprises by a kind of operating system that is used for boil-off gas is carried out the LNG carrier of supercooled liquidization is provided: the boil-off gas compressor; The low temperature heat exchanger that links to each other with refrigeration system; And first check-valves and first pressure-control valve, be installed on the pipeline that connects liquefied natural gas phase separator and gas combustion unit; This operating system also comprises: parallel pipeline, with the parallel structure same structure that is connected and has and be equipped with the pipeline of first check-valves and first pressure-control valve of the pipeline that is used to be connected the liquefied natural gas phase separator and first check-valves; Second check-valves, it is installed on the parallel pipeline, and prevents the refluence of the gas that produced when the pressure anomaly of pipeline increases; And second pressure-control valve, be installed on the parallel pipeline, keep the predetermined pressure of liquefied natural gas phase separator by regulating the evaporation tolerance that produces by the boil-off gas compressor, so that the described liquefied natural gas phase separator of operating carries out quiet run under supercooled state; Wherein an end of this parallel pipeline links to each other with pipeline between boil-off gas compressor and the low temperature heat exchanger, be used for to be provided to the steam dome, top of liquefied natural gas phase separator by the boil-off gas of boil-off gas compressor discharge, so that in the supercooled liquid process, play the covering effect, so that the pressure of the liquefied natural gas of liquefied natural gas phase separator and liquid level are stablized control.
According to the present invention, above-mentioned and other purpose can realize that it is used to carry out the supercooled liquidization of boil-off gas by the operating system that a kind of LNG carrier is provided, and this operating system comprises: the boil-off gas compressor; The low temperature heat exchanger that links to each other with refrigeration system; And first check-valves and first pressure-control valve, be installed on the pipeline that connects liquefied natural gas phase separator and gas combustion apparatus; This operating system also comprises: parallel pipeline, with the parallel structure same structure that is connected and has and be equipped with the pipeline of first check-valves and first pressure-control valve of the pipeline that is used to be connected the liquefied natural gas phase separator and first check-valves; Nitrogenous generator is connected with parallel pipeline, and is installed on the cabin of liquefied gas carrier, in order to nitrogen is fed to the liquefied natural gas phase separator of operating under the cool condition crossing, so that keep the predetermined pressure of liquefied natural gas phase separator; Second check-valves is used to prevent the refluence that is produced when the pressure anomaly of pipeline increases; And second pressure-control valve, be used for keeping the predetermined pressure of liquefied natural gas phase separator, so that the liquefied natural gas phase separator quiet run of under supercooled state, operating by adjusting nitrogen amount; Wherein nitrogen provides to the steam dome of liquefied natural gas phase separator from nitrogenous generator, in order to play the covering effect in the supercooled liquid process, so that the pressure of the liquefied natural gas of liquefied natural gas phase separator and liquid level are stablized control.
Description of drawings
Objects and advantages of the present invention will be by becoming apparent below in conjunction with the description of accompanying drawing to specific embodiment, in the accompanying drawings:
Fig. 1 illustrates the exemplary system figure of operating system that is used for carrying out at LNG carrier the supercooled liquidization of boil-off gas according to the preferred embodiment of the invention;
Fig. 2 is the exemplary system figure of operating system that is used for carrying out at LNG carrier the supercooled liquidization of boil-off gas that according to the present invention another preferred embodiment is shown; And
Fig. 3 is a form, shows according to the operation and comparison according to the operation of the operating system of the saturated liquefaction of carrying out boil-off gas in traditional LNG carrier of in the LNG carrier of the present invention boil-off gas being carried out the operating system of supercooled liquidization.
The specific embodiment
Operating system according to the LNG carrier of the boil-off gas supercooled liquidization that is used to liquefy again of first preferred embodiment of the invention comprises: boil-off gas compressor 10, the low temperature heat exchanger 20 that links to each other with refrigeration system 40 and check-valves 50, pressure-control valve 60, it is installed on the pipeline that connects liquefied natural gas phase separator 30 and gas combustion unit 80.The operating system of this LNG carrier also comprises and is used to be connected liquefied natural gas phase separator 30 parallel pipeline parallel with the pipeline of check-valves 50, and has and the identical structure of pipeline that check-valves 50 and pressure-control valve 60 are installed.This parallel pipeline comprise check-valves 50 ', it is used to prevent the refluence of the gas that produced when pipeline pressure increases unusually; And pressure-control valve 60 ', it is used for keeping the predetermined pressure of liquefied natural gas phase separator 30 by adjusting the evaporation tolerance that is produced by boil-off gas compressor 10, so that the liquefied natural gas phase separator of operating under supercooled state 30 is able to quiet run.One end of this parallel pipeline links to each other with pipeline between boil-off gas compressor 10 and the cryogenic refrigeration heat exchanger 20, so that will be provided to the steam dome, top of liquefied natural gas phase separator 30 by the boil-off gas that boil-off gas compressor 10 is discharged, so that in the supercooled liquid operation, play the covering effect, so that the pressure of the liquefied natural gas of liquefied natural gas phase separator 30 and liquid level are stablized control.
In addition, the operating system that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again of another preferred embodiment comprises according to the present invention: boil-off gas compressor 10, the cryogenic refrigeration heat exchanger 20 that links to each other with refrigeration system 40, check-valves 50 and pressure-control valve 60 are installed on the pipeline that connects liquefied natural gas phase separator 30 and gas combustion unit 80.The operating system of this LNG carrier also comprises the parallel pipeline parallel with the pipeline of check-valves 50 with being connected liquefied natural gas phase separator 30, and has and the identical structure of pipeline that check-valves 50 and pressure-control valve 60 are installed.This parallel pipeline links to each other with the nitrogenous generator 70 in the cabin that is installed on liquefied gas carrier, in order to nitrogen is supplied to the liquefied natural gas phase separator of operating under the cool condition crossing 30, in order to keep the predetermined pressure of liquefied natural gas phase separator 30, and comprise check-valves 50 ', be used to prevent the refluence of gas when pipeline pressure increases unusually; Pressure-control valve 60 ', it is used for keeping the predetermined pressure of liquefied natural gas phase separator 30 by adjusting nitrogen amount, so that the liquefied natural gas phase separator of operating under the mistake cool condition 30 is able to quiet run.Like this, nitrogen provides to the steam dome of liquefied natural gas phase separator 30 from nitrogenous generator 70, so that play the covering effect in the supercooled liquid process, makes the pressure and the liquid level of the liquefied natural gas of liquefied natural gas phase separator 30 be stablized control like this.
Below with reference to Fig. 1, the operate system components that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again according to first preferred embodiment of the invention is described.
Boil-off gas compressor 10 is with the predetermined pressure compression boil-off gas that cargo hold was produced by LNG carrier, and this gas is provided to low temperature heat exchanger 20, so that make the stable liquefaction again of boil-off gas.
Low temperature heat exchanger 20 carries out heat exchange in the boil-off gas of compressing with predetermined pressure and between the cold refrigerant of refrigeration system 40 introducings, so that the boil-off gas that liquefaction is compressed.
The liquefied natural gas phase separator 30 that links to each other with low temperature heat exchanger 20 is as surge tank, so that make the liquefied natural gas by low temperature heat exchanger 20 liquefaction be back to cargo hold reposefully.Simultaneously, for predetermined pressure and the predetermined fluid level that keeps liquefied natural gas, the fluid level control valve 90 that is used to keep the predetermined fluid level of liquefied natural gas links to each other with liquefied natural gas phase separator 30.
In order to make boil-off gas cold excessively, need have the cold-producing medium of the specified quantitative of specified temp.Refrigeration system 40 as the refrigeration system that is used to produce required cold-producing medium comprises compressor, cooler and turbo-expander, and links to each other with low temperature heat exchanger 20.
Liquefied natural gas phase separator 30 links to each other with pressure-control valve 60 with check-valves 50, this check-valves is used to prevent the refluence of gas when the pressure anomaly of gas combustion unit 80 increases, and this pressure-control valve is used for keeping the predetermined pressure of liquefied natural gas phase separator 30 by discharging the flash gas that is produced by liquefied natural gas phase separator 30 when the abnormal operation owing to liquefied natural gas phase separator 30 causes flash gas generation and pressure to raise.
When the abnormal operation owing to liquefied natural gas phase separator 30 causes flash gas generation and pressure to raise, the flash gas that gas combustion unit 80 oxidations are produced by liquefied natural gas phase separator 30 is so that keep the predetermined pressure of liquefied natural gas phase separator 30.
Particularly, according to first preferred embodiment of the invention, the operating system that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again comprises parallel pipeline, and it has the identical structure of structure with the pipeline that check-valves 50 and pressure-control valve 60 are installed between liquefied natural gas phase separator 30 and check-valves 50.This parallel pipeline comprise check-valves 50 ', be used to prevent cause the refluence that produces owing to pressure anomaly increases; And pressure-control valve 60 ', it keeps the predetermined pressure of liquefied natural gas phase separator 30 by the amount of adjusting the boil-off gas that is produced by boil-off gas compressor 10, so that carry out quiet run crossing the liquefied natural gas phase separator of operating under the cool condition 30.One end of this parallel pipeline links to each other with pipeline between boil-off gas compressor 10 and the low temperature heat exchanger 20, so that will provide by the boil-off gas that boil-off gas compressor 10 is discharged to the steam dome, top of liquefied natural gas phase separator 30, in order to play the covering effect in the supercooled liquid process, the pressure of the liquefied natural gas of liquefied natural gas phase separator 30 and liquid level are stablized control like this.
According to first preferred embodiment of the invention, boil-off gas by 10 dischargings of boil-off gas compressor is supplied to the steam dome, top of liquefied natural gas phase separator 30 so that play the covering effect, makes the pressure and the liquid level of the liquefied natural gas of liquefied natural gas phase separator 30 be stablized control like this.
In operating system according to a first advantageous embodiment of the invention, by pact-100 that each cargo hold produced ℃, 0.05 crust, g, 5, the boil-off gas of 717kg/hr is become-120 ℃ approximately, 0.05 crust, g, 6, the boil-off gas of 127kg/hr, offer boil-off gas compressor 10, with and being compressed into predetermined temperature and predetermined pressure (promptly about-(subzero) 27 ℃, 3.49 crust offer low temperature heat exchanger 20 after boil-off gas g).
As mentioned above, the boil-off gas that is provided needs the cold-producing medium with specified temp of specified quantitative so that make the boil-off gas supercooled liquidization.Low temperature heat exchanger 20 carries out heat exchange between boil-off gas of being compressed with predetermined pressure by refrigeration system 40 (it is as being used to produce the refrigeration system of required cold-producing medium and comprise compressor, cooler and turbo-expander) and the refrigerant by refrigeration system 40 generations, with the liquefaction boil-off gas, and with boil-off gas (-167 ℃ approximately, 0.05 crust, g, 6 127kg/hr) offers liquefied natural gas phase separator 30.
Simultaneously, liquefied natural gas phase separator 30 links to each other with gas combustion unit 80, in order to when causing flash gas generation and pressure to raise owing to liquefied natural gas phase separator 30 abnormal operations, the flash gas that oxidation is produced by liquefied natural gas phase separator 30 is to keep the predetermined pressure of liquefied natural gas phase separator 30.When causing flash gas generation and pressure to raise owing to liquefied natural gas phase separator 30 abnormal operations, the flash gas that liquefied natural gas phase separator 30 is produced by liquefied natural gas phase separator 30 by check-valves 50 discharging is to gas combustion unit 80, the refluence that raises and cause with the pressure anomaly that prevents to be produced owing to flash gas, and pressure-control valve 60 is installed on the pipeline that is connected with gas combustion unit 80, so that gas combustion unit 80 is kept the predetermined pressure of liquefied natural gas phase separator 30 by the oxidation flash gas.
Except aforesaid operations, particularly, according to first preferred embodiment of the invention, the operating system that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again comprises parallel pipeline, it has the identical structure of structure with the pipeline between liquefied natural gas phase separator 30 and check-valves 50 that check-valves 50 and pressure-control valve 60 are installed, this parallel pipeline comprise check-valves 50 ', be used to prevent cause the refluence that produces owing to pressure anomaly increases; And pressure-control valve 60 ', it keeps the predetermined pressure of liquefied natural gas phase separator 30 by adjusting the evaporation tolerance that is produced by boil-off gas compressor 10, so that the liquefied natural gas phase separator of operating under the mistake cool condition 30 carries out quiet run.The end of this parallel pipeline links to each other with pipeline between boil-off gas compressor 10 and the low temperature heat exchanger 20, so that will provide by the boil-off gas that boil-off gas compressor 10 is discharged, in order in the supercooled liquid process, to play the covering effect to the steam dome, top of liquefied natural gas phase separator 30.Therefore, the pressure of the liquefied natural gas of liquefied natural gas phase separator 30 and liquid level are stablized control.
Below with reference to Fig. 2, the operating system that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again according to second preferred embodiment of the invention is described.
Comprise most of parts according to the operating system of the LNG carrier of second preferred embodiment of the invention according to the operating system of the LNG carrier of first preferred embodiment of the invention, especially, also comprise and be used to be connected the parallel parallel pipeline that is connected of pipeline of liquefied natural gas phase separator 30 and check-valves 50, and it has the identical structure of structure with the pipeline that check-valves 50 and pressure-control valve 60 are installed.This parallel pipeline links to each other with the nitrogenous generator 70 that is installed on the liquefied gas carrier cabin, and in order to nitrogen is offered the liquefied natural gas phase separator of operating under the cool condition crossing 30, to keep the predetermined pressure of liquefied natural gas phase separator 30.This parallel pipeline comprise check-valves 50 ' and pressure-control valve 60 ', check-valves 50 ' be used to prevents the refluence that produced when pipeline pressure increases unusually, and pressure-control valve 60 ' be used for keeping the predetermined pressure of liquefied natural gas phase separator 30, so that the liquefied natural gas phase separator of operating under the mistake cool condition 30 is able to quiet run by adjusting nitrogen amount.
The operation of operating system that boil-off gas is carried out the LNG carrier of supercooled liquidization that is used for liquefying again according to second preferred embodiment of the invention is identical with operation according to the operating system of first preferred embodiment of the invention.Comprise and be used to be connected the parallel parallel pipeline that is connected of pipeline of liquefied natural gas phase separator 30 and check-valves 50 according to the operating system of second preferred embodiment of the invention, and it has the identical structure of structure with the pipeline that check-valves 50 and pressure-control valve 60 are installed.This parallel pipeline links to each other with the nitrogenous generator 70 that is installed on the LNG carrier cabin, and be used for nitrogen is offered the liquefied natural gas phase separator of operating under the cool condition crossing 30, to keep the predetermined pressure of liquefied natural gas phase separator 30, and this parallel pipeline comprise check-valves 50 ' and pressure-control valve 60 ', check-valves 50 ' be used to prevents the refluence that produced when pipeline pressure increases unusually, and pressure-control valve 60 ' be used for keeping the predetermined pressure of liquefied natural gas phase separator 30 by adjusting nitrogen amount, be able to quiet run so that cross the liquefied natural gas phase separator 30 of operation under the cool condition.According to the operating system of second preferred embodiment of the invention, by simplifying the operation, the extra boil-off gas that excessively produces by two phase region in the liquefied natural gas reflux pipeline and the pressure loss and the power consumption that causes can reduce and obtain economic benefit effectively.In addition, because it is different with structure according to the operating system of first preferred embodiment of the invention, nitrogen offers the steam dome, top of liquefied natural gas phase separator 30 from nitrogenous generator 70, in order in the supercooled liquid process, to play the covering effect, so that the operating pressure of the liquefied natural gas of liquefied natural gas phase separator 30 and liquid level are stablized control.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
As mentioned above, the liquefaction system again of boil-off gas is improved to supercooled liquid system efficiently in the LNG carrier, so that reducing the power consumption that causes, extra boil-off gas that causes owing to the excessive generation of two phase region in the liquefied natural gas reflux pipeline and pressure is able to effective reduction, as shown in Figure 3.In addition, because it is different with the operating system of first preferred embodiment of the invention, nitrogen offers the steam dome, top of liquefied natural gas phase separator from nitrogenous generator, so that in the supercooled liquid process, play the covering effect, make the operating pressure and the liquid level of the liquefied natural gas of liquefied natural gas phase separator be stablized control, and obtained economic benefit owing to simplifying the operation.
Claims (2)
1. the operating system of a LNG carrier, it is used for boil-off gas is carried out supercooled liquidization so that liquefaction again, and described operating system comprises: the boil-off gas compressor; The low temperature heat exchanger that links to each other with refrigeration system; And first check-valves and first pressure-control valve, be installed on the pipeline that connects liquefied natural gas phase separator and gas combustion unit; Described operating system also comprises:
Parallel pipeline is connected with the pipeline that is used to be connected described liquefied natural gas phase separator and described first check-valves is parallel, and has the identical structure of structure with the pipeline that described first check-valves and described first pressure-control valve are installed;
Second check-valves, it is installed on the described parallel pipeline, and prevents the refluence of the gas that produced when the pressure anomaly of described pipeline increases; And
Second pressure-control valve, be installed on the described parallel pipeline, and keep the predetermined pressure of described liquefied natural gas phase separator by the amount of regulating the boil-off gas that produces by described boil-off gas compressor, so that carry out quiet run crossing the described liquefied natural gas phase separator of operating under the cool condition;
One end of wherein said parallel pipeline links to each other with pipeline between described boil-off gas compressor and the described low temperature heat exchanger, be used for to be provided to the steam dome, top of described liquefied natural gas phase separator by the described boil-off gas of described boil-off gas compressor discharge, so that in the supercooled liquid process, play the covering effect, so that the pressure of the liquefied natural gas of described liquefied natural gas phase separator and liquid level are controlled with being stabilized.
2. the operating system of a LNG carrier, it is used for boil-off gas is carried out supercooled liquidization so that liquefaction again, and described operating system comprises: the boil-off gas compressor; The low temperature heat exchanger that links to each other with refrigeration system; And first check-valves and first pressure-control valve, be installed on the pipeline that connects liquefied natural gas phase separator and gas combustion unit; Described operating system also comprises:
Parallel pipeline is connected with the pipeline that is used to be connected described liquefied natural gas phase separator and described first check-valves is parallel, and has the identical structure of structure with the pipeline that described first check-valves and described first pressure-control valve are installed;
Nitrogenous generator is connected with described parallel pipeline, and is installed on the cabin of described liquefied gas carrier, in order to nitrogen is offered the described liquefied natural gas phase separator of operating under the cool condition crossing, so that keep the predetermined pressure of described liquefied natural gas phase separator;
Second check-valves is used to prevent the refluence that is produced when the pressure anomaly of described pipeline increases; And
Second pressure-control valve is used for keeping the predetermined pressure of liquefied natural gas phase separator by adjusting nitrogen amount, so that crossing the described liquefied natural gas phase separator quiet run of operating under the cool condition;
Wherein nitrogen is provided to the steam dome of described liquefied natural gas phase separator from described nitrogenous generator, and in order to play the covering effect in described supercooled liquid process, the pressure and the liquid level of the liquefied natural gas of described like this liquefied natural gas phase separator are stabilized control.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050004649A KR100638925B1 (en) | 2005-01-18 | 2005-01-18 | Operating system for sub-cooled liquefaction boil-off gas of LNG ship |
| KR1020050004649 | 2005-01-18 | ||
| KR1020050004650 | 2005-01-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1808027A true CN1808027A (en) | 2006-07-26 |
| CN100529620C CN100529620C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100855890A Expired - Fee Related CN100529620C (en) | 2005-01-18 | 2005-07-25 | Operating system of liquefied natural gas ship for sub-cooling and liquefying boil-off gas |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100638925B1 (en) |
| CN (1) | CN100529620C (en) |
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| CN101915494A (en) * | 2010-07-27 | 2010-12-15 | 华南理工大学 | Re-liquefaction method of shipped liquid cargo of ethylene/ethane evaporation gas |
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- 2005-07-25 CN CNB2005100855890A patent/CN100529620C/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| KR100638925B1 (en) | 2006-10-26 |
| CN100529620C (en) | 2009-08-19 |
| KR20060083726A (en) | 2006-07-21 |
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