CN107702430A - The re-liquefied system and method for ship - Google Patents

The re-liquefied system and method for ship Download PDF

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Publication number
CN107702430A
CN107702430A CN201710855062.4A CN201710855062A CN107702430A CN 107702430 A CN107702430 A CN 107702430A CN 201710855062 A CN201710855062 A CN 201710855062A CN 107702430 A CN107702430 A CN 107702430A
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China
Prior art keywords
heat exchanger
gas
level
liquefied
outlet
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CN201710855062.4A
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Chinese (zh)
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CN107702430B (en
Inventor
刘国满
代坤
于丽媛
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Hung Hung Liquefied Gas Machinery Engineering (dalian) Co Ltd
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Hung Hung Liquefied Gas Machinery Engineering (dalian) Co Ltd
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Classifications

    • 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
    • F25J1/0221—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 the cold stored in an external cryogenic component in an open refrigeration loop
    • F25J1/0222—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 the cold stored in an external cryogenic component in an open refrigeration loop in combination with an intermediate heat exchange fluid between the cryogenic component and the fluid to be liquefied
    • 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
    • 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
    • F25J1/003—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
    • F25J1/0047—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 an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—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 an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant 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
    • 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
    • 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
    • F25J1/0262—Details of the cold heat exchange system
    • 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
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • 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.
    • F25J1/0294—Multiple compressor casings/strings in parallel, e.g. split arrangement
    • 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
    • F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
    • 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
    • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
    • F25J2240/60—Expansion by ejector or injector, e.g. "Gasstrahlpumpe", "venturi mixing", "jet pumps"
    • 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

Abstract

The re-liquefied system of ship, the BOG process fields belonged on LNG fuels and energies ship or LNG cargo ships, technical problems to be solved are：It is re-liquefied to BOG gases for recovery, and in removal process using BOG itself cold energy to reduce energy resource consumption, technical essential：The air exit all the way of LNG holding bays or cargo hold is connected to the shell side cold side of the Pyatyi heat exchanger, the Pyatyi heat exchanger shell pass cold side outlet port is connected to the first-class heat exchanger shell side cold side import, and the entrance connection of the shell side cold side outlet port and natural gas compressor of the first-class heat exchanger thinks that natural gas compressor supplies；Effect is：By BOG cold energy uses in re-liquefied system, on the premise of ship fuel gas supply is not influenceed, vessel motion energy consumption is reduced, realizes the operation cost for also mitigating shipowner while energy-saving and emission-reduction.

Description

The re-liquefied system and method for ship
Technical field
The invention belongs to the BOG process fields on LNG fuels and energies ship or LNG cargo ships, it is re-liquefied to be related to a kind of ship System.
Background technology
In recent years, with the control getting worse lattice that atmosphere pollution getting worse, the whole world are discharged to the gas of ship.It is American-European The emission control area of oneself is had been set up Deng developed country, reaches Tier II and Tier III discharge marks at the appointed time It is accurate.
Ship natural gas fuel can reduce by more than 30% carbon emission and discharged nitrous oxides, more than 98% sulfide row Put the fuel cost with 30% or so.Therefore, ship use instead natural gas for fuel be energy-saving and emission-reduction, improve transport benefits it is the most straight Connect effective measures.In recent years, consider existing ship is transformed into using LNG as the ship of main fuel or is at least transformed into LNG For auxiliary fuel ship it is more and more more, so as to which LNG can be used in emission control area of various countries, reach discharge standard；Simultaneously Also promote the row built and ship and LNG cargo ships are filled using LNG as the various ships of fuel and the LNG for transporting and filling Industry develops.
BOG so for small-sized LNG fuels and energies ship or LNG cargo ships in LNG holding bays can be led mostly Machine, subsidiary engine or boiler are disposed.And for medium-and-large-sized fuels and energy ship and LNG cargo ships, if BOG can not be led Machine, subsidiary engine or boiler are disposed, then just need to consider other treatment measures, now by the re-liquefied recovery afterwards of gas then It is the scheme of most energy-conserving and environment-protective, but re-liquefied system is limited by the factor such as system complex and higher cost simultaneously, therefore such as What can also become the problem for needing to capture under the premise of cost-effective using re-liquefied system recovery BOG.
The content of the invention
The technical problem to be solved in the present invention is：It is re-liquefied to BOG gases for recovery, it is and sharp in removal process With BOG itself cold energy to reduce energy resource consumption.In order to solve the above-mentioned technical problem, the present invention proposes following scheme：
A kind of re-liquefied system of ship, including natural gas compressor, the outlet of natural gas compressor and the housing of cooler Journey hot side import is connected, and the cooler shell side hot side outlet is connected with the nitrogen separation tank import 1, the nitrogen separation tank The gas exhaust piping all the way of outlet is connected with the import of the booster compression unit, the another way row of the outlet of the nitrogen separation tank Air pipe connection is supplied to gas consumption equipment；
The first-class heat exchanger tube side that the outlet of the booster compression unit passes through high pressure gas pipeline and the re-liquefied ice chest Hot side connects, and is connected successively by high pressure gas pipeline with one to Pyatyi heat exchanger, its tube side hot side in the re-liquefied ice chest, institute The tube side hot side outlet for stating Pyatyi heat exchanger is connected with the high-pressure inlet of the injector, the outlet of the injector and described one The top connection of level knockout drum, the lower section leakage fluid dram of the one-level knockout drum are upper with the two level knockout drum Portion connects, and the lower section leakage fluid dram of the two level knockout drum is connected to LNG holding bays or cargo hold；
Boil-off gas discharged by the LNG holding bays or cargo hold and be divided into two-way be supplied in re-liquefied ice chest with it is therein Heat exchanger exchanges heat；
The air exit all the way of LNG holding bays or cargo hold is connected to the shell side cold side of the Pyatyi heat exchanger, the Pyatyi Heat exchanger shell pass cold side outlet port is connected to the first-class heat exchanger shell side cold side import, and the shell side cold side of the first-class heat exchanger goes out Mouth is connected with the entrance of natural gas compressor to be supplied to natural gas compressor；
The another way air exit of LNG holding bays or cargo hold is connected to the suction inlet 1 of the injector, the outlet of injector One-level knockout drum is connected, the upper outlet of the one-level knockout drum is connected to the shell side cold side of the level Four heat exchanger Import, the shell side cold side outlet port of the level Four heat exchanger are connected with the shell side cold side import of the secondary heat exchanger, the two level The shell side cold side outlet port of heat exchanger is connected with the import 2 of nitrogen separation tank.
There is pressure regulator valve, two level gas-liquid point on the connecting line with two level knockout drum of the one-level knockout drum LNG storage cabins or cargo hold are connected to by LNG loop pipes from tank, and two level knockout drum is inhaled by the vacuum of pipeline and injector Entrance connects, and has the pressure regulator valve for being used for controlling two level gas-liquid separation pressure inside the tank on the pipeline.
Described three-level heat exchanger connection refrigerant system.
The gas consumption equipment includes main frame, generator, boiler, one kind in GVU or its combination.
Described one to Pyatyi heat exchanger be Heat Exchangers.
Boil-off gas is the BOG that LNG holding bays or cargo hold generate, and high pressure gas is the row after the processing of booster compression unit Gas, circulating air are the gas of discharge above one-level knockout drum.
The pressure of the high pressure entry of the injector is controlled in more than 200 kilograms, and temperature is below -70 DEG C.
In the downstream connection high pressure compressor of described booster compression unit to more than 300 kilograms and to be by gas boosting MAN-ME-GI main frames provide 200~300 kilograms of combustion gas.
A kind of liquifying method of the re-liquefied system of ship, the liquefaction system include gas boosting unit and re-liquefied cold Case；
The gas suction inlet of gas boosting unit is connected to the shell side cold side of the secondary heat exchanger in re-liquefied ice chest, by gas After the natural gas of body suction inlet suction flows through natural gas compressor, cooler, nitrogen separation tank successively, supercharging pressure is supplied in respectively Gas consumption equipment on contracting unit and ship, and natural gas is transported in re-liquefied ice chest after the supercharging of booster compression unit The tube side of multi-stage heat exchanger simultaneously carries out heat exchange in multi-stage heat exchanger, the gas after exchanging heat and the steaming for coming from LNG storage tank Get angry together, the natural gas of low temperature liquid is condensed into carry out gas-liquid separation in one-level knockout drum by injector expansion；
LNG liquid in one-level knockout drum is passed through after two level knockout drum carries out decompression cooling, dependence and LNG LNG liquid is depressed into LNG holding bays or cargo hold by the pressure differential of holding bay by pipeline；And gas-liquid point in one-level knockout drum Gas from sequentially enters the shell side cold side of level Four heat exchanger, secondary heat exchanger, as with level Four heat exchanger, secondary heat exchanger The heat transferring medium of tube side heat exchange, is entered back into the nitrogen separation tank of gas boosting unit；Meanwhile the Pyatyi in re-liquefied ice chest is changed The shell side cold side of hot device is connected by pipeline with the gas-phase space of LNG storage tank so that the boil-off gas of natural gas to be changed as with Pyatyi Hot device and the heat transferring medium of first-class heat exchanger tube side heat exchange enter the natural gas compressor of gas boosting unit, next so as to carry out Wheel compression, cooling, expansion, liquefaction cycle.
Beneficial effect：Solve that re-liquefied system effectiveness is low, high energy consumption and BOG cold energy waste problem.By BOG cold energy It is used in re-liquefied system, on the premise of ship fuel gas supply is not influenceed, reduces vessel motion energy consumption, realize that energy-conservation subtracts Also the operation cost of shipowner is mitigated while row.
Brief description of the drawings
Fig. 1 is the structured flowchart of the re-liquefied system of ship described in the present embodiment 1；
Fig. 2 is refrigerant system structured flowchart；
Fig. 3 is the structured flowchart of the re-liquefied system of ship described in embodiment 3；
Fig. 4 is the structured flowchart of the re-liquefied system of ship described in embodiment 4；
Fig. 5 is the structured flowchart of the re-liquefied system of ship described in embodiment 5.
Fig. 6 is the structured flowchart of the re-liquefied system of ship described in embodiment 6.
In figure：1- natural gas compressors, 2- coolers, 3/3-1/3-2- nitrogen separation tanks, 4- booster compression units, 5- is again Liquefy ice chest, 6- refrigerant systems, 7-LNG holding bays or cargo hold, 8- first-class heat exchangers, 9- secondary heat exchangers, the heat exchange of 10- three-levels Device, 11- level Four heat exchangers, 12- Pyatyi heat exchangers, 13- injectors, 14- one-level knockout drums, 15- two level knockout drums, 16- high pressure compressors, 17- refrigeration compressors, 18- separator _ 1,19- heat exchanger _ 1,20- separator _ 2,21- dry filters Device, 22- refrigerating economizers, 23- filters, 24- pumps, 25- heat exchangers _ 2,26- heat exchanger _ 3.
Embodiment
Hereafter the accompanying drawing according to patent of the present invention to technical scheme completely clearly describe, described scheme is only A part for this patent case study on implementation, and not all case study on implementation.Case study on implementation based on this patent, those skilled in the art Other case study on implementation proposed on the premise of no progress creative work, belong to the application protection domain of this patent.
Embodiment 1：A kind of re-liquefied system of ship, including natural gas compressor 1, the outlet of natural gas compressor with it is described The shell side hot side import of cooler 2 is connected, and the shell side hot side outlet of cooler 2 is connected with the import 1 of nitrogen separation tank 3, institute The gas exhaust piping all the way for stating the outlet of nitrogen separation tank 3 is connected with the import of the booster compression unit 4, the nitrogen separation tank 3 Outlet another way gas exhaust piping connection supply to gas consumption equipment；
Managed by the first-class heat exchanger 8 of high pressure gas pipeline and the re-liquefied ice chest 5 outlet of the booster compression unit 4 Journey hot side connects, and is connected successively by high pressure gas pipeline with one to Pyatyi heat exchanger, its tube side hot side in the re-liquefied ice chest, The tube side hot side outlet of the Pyatyi heat exchanger 12 is connected with the high-pressure inlet of the injector 13, the outlet of the injector 13 It is connected with the top of the one-level knockout drum 14, the lower section leakage fluid dram of the one-level knockout drum 14 and the two level gas The top connection of liquid knockout drum 15, the lower section leakage fluid dram of the two level knockout drum 15 are connected to LNG holding bays or cargo hold 7；
Boil-off gas (BOG) discharged by the LNG holding bays or cargo hold 7 and be divided into two-way be supplied in re-liquefied ice chest with Heat exchanger heat exchange therein；
The air exit all the way of LNG holding bays or cargo hold 7 is connected to the shell side cold side of the Pyatyi heat exchanger 12, and described five The level shell side cold side outlet port of heat exchanger 12 is connected to the shell side cold side import of first-class heat exchanger 8, the shell side of the first-class heat exchanger 8 The entrance of cold side outlet port and natural gas compressor is connected to be supplied to natural gas compressor；
The another way air exit of LNG holding bays or cargo hold 7 is connected to the suction inlet 1 of the injector 13, injector 13 Outlet connection one-level knockout drum 14, the upper outlet of the one-level knockout drum 14 is connected to the level Four heat exchanger 11 shell side cold side import, the shell side cold side of the shell side cold side outlet port of the level Four heat exchanger 11 and the secondary heat exchanger 9 are entered Mouth connection, the shell side cold side outlet port of the secondary heat exchanger 9 are connected with the import 2 of nitrogen separation tank 3.
There is pressure regulator valve, two level gas on the connecting line with two level knockout drum 15 of the one-level knockout drum 14 Liquid knockout drum 15 is connected to LNG storage cabins or cargo hold 7 by LNG loop pipes, and two level knockout drum 15 is by pipeline and injector 13 vacuum inlet feeds connection, and there is the pressure regulator valve for being used for controlling pressure in two level knockout drum 15 on the pipeline.
Described three-level heat exchanger 10 connects refrigerant system 6.
The gas consumption equipment includes main frame, generator, boiler, one kind in GVU or its combination.
Described one to Pyatyi heat exchanger be Heat Exchangers.
The temperature of the high pressure entry of the injector 13 is less than -70 DEG C, but can also be arranged to -70 as needed ~-75 DEG C.
Boil-off gas is the BOG that LNG holding bays or cargo hold 7 generate, and high pressure gas is the row after the processing of booster compression unit 4 Gas, circulating air are the gas of the top of one-level knockout drum 14 discharge.
The pressure of the high pressure entry of the injector is controlled in more than 200 kilograms, and temperature is below -70 DEG C.
In the downstream connection high pressure compressor of described booster compression unit to more than 300 kilograms and to be by gas boosting MAN-ME-GI main frames provide 200~300 kilograms of combustion gas.
A kind of liquifying method of the re-liquefied system of ship is described in this embodiment, and the liquefaction system increases including gas Press unit and re-liquefied ice chest；Described gas boosting unit includes the natural gas compressor, cooler, nitrogen point being sequentially connected From tank, booster compression unit, and nitrogen separation tank is connected with gas consumption equipment, and in a preferred approach, booster compression unit Downstream be also associated with high pressure compressed unit, described re-liquefied ice chest includes multi-stage heat exchanger (being preferably Pyatyi), two level gas Liquid knockout drum, injector；
The gas suction inlet of gas boosting unit is connected to the shell side cold side of the secondary heat exchanger in re-liquefied ice chest, by gas After the natural gas of body suction inlet suction flows through natural gas compressor, cooler, nitrogen separation tank successively, supercharging pressure is supplied in respectively Gas consumption equipment on contracting unit and ship, and natural gas is transported in re-liquefied ice chest after the supercharging of booster compression unit The tube side of multi-stage heat exchanger simultaneously carries out heat exchange in multi-stage heat exchanger, the gas after exchanging heat and the steaming for coming from LNG storage tank Get angry together, the natural gas of low temperature liquid is condensed into carry out gas-liquid separation in one-level knockout drum by injector expansion；
LNG liquid in one-level knockout drum is passed through after two level knockout drum carries out decompression cooling, dependence and LNG LNG liquid is depressed into LNG holding bays by the pressure differential of holding bay by pipeline；And in one-level knockout drum in gas-liquid separation Gas sequentially enters the shell side cold side of level Four heat exchanger, secondary heat exchanger, is changed as with level Four heat exchanger, secondary heat exchanger tube side The heat transferring medium of heat, enter after heat exchange in the nitrogen separation tank of gas boosting unit；Meanwhile the Pyatyi heat exchange in re-liquefied ice chest The shell side cold side of device is connected by pipeline with the gas-phase space of LNG storage tank so that the boil-off gas of natural gas to be exchanged heat as with Pyatyi Device and the heat transferring medium of first-class heat exchanger tube side heat exchange enter the natural gas compressor of gas boosting unit, so as to carry out next round Compression, cooling, expansion, liquefaction cycle.
The scheme further stated that as another kind or the priority scheme as supplement：A kind of re-liquefied system of ship, Including：
Injector, the boil-off gas that the connection of its entrance is at least come from LNG storage silos or freight house；
One-level knockout drum, is connected with injector, and boil-off gas is gas-liquid mixture phase through the inflated liquefaction of injector And it is stored in one-level knockout drum；
First group of heat exchanger (secondary heat exchanger and/or level Four heat exchanger), its shell side connect with the one-level knockout drum Logical, the gas part of the gas-liquid mixture phase is passed through the shell side of first group of heat exchanger as the first cold medium, and with first group It is pressurized after the tube side heat exchange of heat exchanger to supply and/or continue, because first cold medium comes from one-level knockout drum It is middle that its original main source is mainly pressurization gas through the liquefied gas-liquid mixed of injector gas expansion, thus In one group of heat exchanger exchange heat after its pressure can reach close gas supply main frame, generator, boiler, GCU use range (such as 12bar), thus by the secondary heat exchanger shell side of first group of heat exchanger the gas discharged is sent directly into surge tank, the surge tank In addition to having the function that storage and buffering, it can be a nitrogen separation tank, and in nitrogen separation tank, a gas part is directly Gaseous mixture supply main frame, generator, boiler, GCU are supplied, unnecessary gas can enter booster compression unit with pressure build up, Such as 200bar, 40 ° (original main sources of the first cold medium)；
Second group of heat exchanger (first-class heat exchanger), its shell side is passed into be made from the boil-off gas of LNG storage silos or freight house For the second cold medium, and exchanged heat with the tube side of second group of heat exchanger (first-class heat exchanger), and the gas of shell side output be pressurized with Supply and/or continue to be pressurized；
Because the main primary source of the second cold medium is in LNG storage silos or the boil-off gas of freight house, the second cold medium by The shell side discharge of the first-class heat exchanger of second group of heat exchanger, its pressure value can not reach use range, such as 6-10bar, in order to increase Pressure uses, and is passed to natural gas compressor, cooler is located at natural gas compressor downstream and with natural gas compressor by pipeline Connection, and the output of cooler is connected to surge tank by pipeline, the surge tank except have the function that storage with addition to buffering, its Can be a nitrogen separation tank, in nitrogen separation tank, a gas part directly feed gaseous mixture supply main frame, generator, Boiler, GCU, unnecessary gas can continue to be pressurized into booster compression unit to heat up, such as 200bar, 40 °.
In another scheme, the output pipe of described surge tank is connected with the intake line of booster compression unit, should In scheme, except gaseous mixture supply main frame, generator, boiler, GCU, remainder is supplied in spraying high-pressure gas engine ME- GI, then remaining gas heating continue to be pressurized, such as 200bar, 40 °, to meet that the main frame of different pressures demand uses.
In a kind of scheme, the output for continuing the gas of supercharging described in each road is connected in (the one-level heat exchange of second group of heat exchanger Device) tube side input, the tube side output of second group of heat exchanger (first-class heat exchanger) and first group of heat exchanger (secondary heat exchanger and/ Or level Four heat exchanger) tube side input connection；The tube side output of first group of heat exchanger (secondary heat exchanger and/or level Four heat exchanger) Being connected with the injector entrance, i.e., second group of heat exchanger only has a heat exchanger, and it is connected to pressurization gas, and with first The tube side connection of group heat exchanger, and exported by the tube side of first group of heat exchanger to injector entrance.
In this scenario, first group of described heat exchanger can be a heat exchanger (secondary heat exchanger)；Or by two The heat exchanger composition that above shell side is interconnected and tube side is connected with each other, at least one pair of two adjacent heat exchanger (such as two level Heat exchanger and level Four heat exchanger) between there is refrigerant system, when an only heat exchanger, it may be mounted at the heat exchanger Upstream or downstream；When using such scheme, because second group of heat exchanger only has one, thus boil-off gas changes with second group Not very fully, cold energy can't be fully utilized for the heat exchange of hot device, thus, refrigeration is now accessed in first group of heat exchanger System, and there is a dependence to refrigeration system.
In another scheme arranged side by side, second group of heat exchanger comprises at least two interconnected heat exchangers, and (one-level is changed Hot device and Pyatyi heat exchanger), the output for the gas for continuing supercharging described in each road is connected in the First Heat Exchanger of second group of heat exchanger The tube side input of (first-class heat exchanger), the output of First Heat Exchanger (first-class heat exchanger) tube side and the (two level of first group of heat exchanger Heat exchanger and level Four heat exchanger) tube side input connection, the tube side output (output of level Four heat exchanger) and second of first group of heat exchanger The tube side input connection of the second heat exchanger (Pyatyi heat exchanger) of group heat exchanger, and the tube side of the second heat exchanger (Pyatyi heat exchanger) Output be connected to the injector entrance.First group of described heat exchanger can be a heat exchanger (secondary heat exchanger)；Or The heat exchanger that person is interconnected by two or more shell side and tube side is connected with each other forms, at least one pair of two adjacent heat exchanger There is refrigerant system between (such as secondary heat exchanger and level Four heat exchanger), when an only heat exchanger, it may be mounted at The upstream or downstream of the heat exchanger；Thus, boil-off gas exchanges heat more abundant with tube side, and the use for refrigeration system does not have Necessary dependence, the energy can be saved, and for the recycling system of scale, its compressor for being used to be pressurized may not necessarily be right Use frequency-changeable compressor.
As the concrete example of such scheme, in Fig. 1, a kind of re-liquefied system of ship is described, system includes natural gas Compressor, cooler, nitrogen separation tank, booster compression unit, re-liquefied ice chest, refrigerant system and LNG holding bays or cargo hold. The outlet of the natural gas compressor is connected with the cooler shell side hot side import, the cooler shell side hot side outlet and institute State nitrogen separation tank import 1 to connect, the nitrogen separation tank outlet is connected with the import of the booster compression unit, the supercharging The high pressure gas of the outlet of compressor set is cooled through the re-liquefied ice chest after decompression, discharging tube be connected to LNG holding bays or Cargo hold, form enclosed liquefaction cycle system；
Described re-liquefied ice chest includes first-class heat exchanger, secondary heat exchanger, three-level heat exchanger, level Four heat exchanger, Pyatyi Heat exchanger, injector, one-level knockout drum and two level knockout drum.
Described one is connected by high pressure gas pipeline to the tube side hot side of Pyatyi heat exchanger successively, the tube side of the Pyatyi heat exchanger Hot side outlet is connected with the high-pressure inlet of the injector, the outlet and the top of the one-level knockout drum of the injector Connection, the lower section leakage fluid dram of the one-level knockout drum are connected with the top of the two level knockout drum, the two level gas The lower section leakage fluid dram of liquid knockout drum is connected to LNG holding bays or cargo hold.
Described boil-off gas BOG is divided into two-way by the LNG holding bays or cargo hold discharge：
Enter the shell side cold side of the Pyatyi heat exchanger all the way, the Pyatyi heat exchanger utilizes LNG holding bays or cargo hold BOG Low temperature the high pressure gas cooled down through the level Four heat exchanger is further cooled；The Pyatyi heat exchanger shell pass is cold For side outlet to the first-class heat exchanger shell side cold side import, the first-class heat exchanger utilizes LNG holding bays or cargo hold BOG residual temperature Precooling, the Pyatyi are carried out to the high pressure gas after booster compression unit processing of the tube side hot side of the first-class heat exchanger Heat exchanger utilizes LNG holding bays or the BOG cold energy of cargo hold successively with the first-class heat exchanger.
All the way to the suction inlet 1 of the injector, the part into the one-level knockout drum as circulating air.Follow Ring gas is connected to the shell side cold side of the level Four heat exchanger, the level Four heat exchange by the upper outlet of the one-level knockout drum Device tube side hot side carries out further cooling drop using high pressure gas of the cryogenic cold energy of circulating air after three-level heat exchanger cooling Temperature；The shell side cold side outlet port of the level Four heat exchanger and the shell side cold side import of secondary heat exchanger connect, the secondary heat exchanger Shell side hot side using circulating air residual temperature cold energy to through the first-class heat exchanger cooling after high pressure gas further cooled down Cooling, the level Four heat exchanger utilize the cold energy of circulating air, the shell side of the secondary heat exchanger with the secondary heat exchanger successively Cold side outlet port is connected with the import 2 of nitrogen separation tank.
The cold energy that the high pressure gas of the tube side hot side of the three-level heat exchanger is then provided using the refrigerant system.
The shell side cold side outlet port of the first-class heat exchanger is connected with the import of the natural gas compressor, the natural pressure Contracting machine is normal temperature compressed machine.
The gas exhaust piping of the nitrogen separation tank can be supplied to gas consumption equipment such as main frame, generator, boiler or GVU.
The temperature of the high pressure entry of the injector 13 is -70~-75 DEG C.
When the re-liquefied system operation of ship, the gas exhaust piping of nitrogen separation tank can according to main frame, generator, boiler or The demand of the gas consumption equipment such as GVU is supplied, and the part in boil-off gas BOG amounts more than ship amount of consumed gas will be by again Liquefaction system liquefies.BOG points of boil-off gas in LNG holding bays or cargo hold 7 is two-way, all the way the natural gas compressor 1 through operation Suction, successively by Pyatyi heat exchanger 12 and the shell side of first-class heat exchanger 8；The high pressure gas (~40 that booster compression unit 4 exports DEG C) enter first-class heat exchanger 8, secondary heat exchanger 9 is entered by BOG coolings；In secondary heat exchanger 9 with the row of level Four heat exchanger 11 The circulating air heat exchange cooling gone out；High pressure gas enters the refrigerant heat exchanger that three-level heat exchanger 10 circulates with refrigerant system 6, and three-level is changed (~-33 DEG C) of the high pressure gas of the hot tube side of device 10 outlet after cooling enters level Four heat exchanger 11, by one-level knockout drum 14 The low-temperature circulating air cooling of portion's discharge；The high pressure gas of tube side hot side exchanges heat with shell side low temperature BOG in Pyatyi heat exchanger 12, cold But (- 70~-75 DEG C) are arrived and enters the high pressure entry of injector 13, makes to make LNG while high pressure gas decompression liquefaction using injector 13 Part boil-off gas BOG superchargings in holding bay or cargo hold 7, turn into a part for the circulating air in one-level knockout drum 14, from And be again introduced into level Four heat exchanger 11 and circulated next time, realize boil-off gas BOG cold energy use and the drop of operation energy consumption It is low.
Embodiment 2：In Fig. 2, refrigerant system is that the three-level heat exchanger 10 in re-liquefied system in ice chest provides cold energy.Through The refrigerant of refrigeration compressor 17 (so that helical-lobe compressor is with oil lubrication pattern as an example) process processing passes through separator _ 1 (18) Impurity and lubricating oil are separated, heat exchanger _ 1 (19) cooling, separator _ 2 (20) separate again, and filtering is dried in device for drying and filtering 21 After processing, reach supercooled state using the remaining cold energy of the refrigerant after the heat exchange of re-liquefied system into refrigerating economizer 22, More cold energy can be provided for re-liquefied system upon inflation, while the refrigerant of refrigeration compressor import is heated and carried out down Kind of refrigeration cycle.In addition in the specific implementation, it is very big in the demand of ship gas consumption equipment, cause re-liquefied system Under design conditions when measuring too small, adjusted according to the monitoring of marine system operational factor, refrigerant system can then be run with low speed Even shut down, or can directly cancel refrigerant system and corresponding three-level heat exchanger, this scheme in design can have The construction cost and operation energy consumption that effect ground reduces.
Embodiment 3：In Fig. 3, according to the parameter monitorings such as the growing amount of boil-off gas BOG in marine system, operating pressure, ship The injection pressure that the high pressure gas of re-liquefied system injector outlet enters one-level knockout drum also changes therewith, works as natural pressure , can be respectively by nitrogen separation tank _ 1 (3_1) and nitrogen separation tank _ 2 (3_ when the discharge pressure of contracting machine and inconsistent circulation atmospheric pressure 2) suction inlet not at the same level of booster compression unit 4, is sent to, to avoid the energy loss after different pressures gas mixing, is also dropped The low energy expenditure of booster compression unit.The gas exhaust piping of nitrogen separation tank _ 1 and nitrogen separation tank _ 2 can be according to gas consumption The actual pressure demand of equipment, the gas consumption equipment such as Win GD main frames or four stroke main frames, generator, boiler or GVU is entered Row supply.
Embodiment 4：In Fig. 4, when marine system main frame is ME-GI main frames, the gas exhaust piping of nitrogen separation tank 3 can basis The actual pressure demand of ship gas consumption equipment, Win GD main frames or four stroke main frames, generator, boiler or GVU etc. are entered Row supply, now the outlet of booster compression unit is divided into two-way, all the way into the pressurized treatment of high pressure compressed unit 16 to ME- The air supply requirement of GI main frames；The part that boil-off gas BOG amounts are more than ship amount of consumed gas will be carried out by the re-liquefied system of another way Liquefaction.
Embodiment 5：In Fig. 5, the case study on implementation of the re-liquefied system of ship based on present patent application in Fig. 1, according to ship The practical operation situation of re-liquefied system, pipeline arrangement, insulation construction and environmental factor etc. influence, the in summary progress of factor , can be by first-class heat exchanger in ice chest 8 and secondary heat exchanger 9 after Heat balance calculation, Pyatyi heat exchanger 12 and level Four heat exchanger 11 The cryogenic media of shell side cold side mutually exchange, i.e., first-class heat exchanger 8 utilizes circulating air cold energy with Pyatyi heat exchanger 12, and two level is changed Hot device 9 utilizes the BOG cold energy of LNG fuel compartments or cargo hold with level Four heat exchanger 11, so as to realize to the abundant of cryogenic gas cold energy Utilize.Scheme after exchange is as follows：
As shown in figure 5, a kind of re-liquefied system of ship, including natural gas compressor 1, the outlet of natural gas compressor and institute The connection of the shell side hot side import of cooler 2 is stated, the shell side hot side outlet of cooler 2 is connected with the import 1 of nitrogen separation tank 3, The gas exhaust piping all the way that the nitrogen separation tank 3 exports is connected with the import of the booster compression unit 4, the nitrogen separation tank The another way gas exhaust piping connection of 3 outlet is supplied to gas consumption equipment；
The high pressure gas of the outlet of the booster compression unit 4 is communicated in the tube side of first-class heat exchanger 8 of the re-liquefied ice chest 5 Hot side, have in the re-liquefied ice chest one to be connected successively by high pressure gas pipeline to Pyatyi heat exchanger, its tube side hot side, described five Level heat exchanger 12 tube side hot side outlet be connected with the high-pressure inlet of the injector 13, the outlet of the injector 13 with it is described The top connection of one-level knockout drum 14, the lower section leakage fluid dram of the one-level knockout drum 14 and the two level gas-liquid separation The top connection of tank 15, the lower section leakage fluid dram of the two level knockout drum 15 are connected to LNG holding bays or cargo hold 7；
Boil-off gas discharged by the LNG holding bays or cargo hold 7 and be divided into two-way be supplied in re-liquefied ice chest with wherein Heat exchanger heat exchange；
The air exit all the way of LNG holding bays or cargo hold 7 is connected to the shell side cold side of the level Four heat exchanger 11, and described four The level shell side cold side outlet port of heat exchanger 11 is connected to the shell side cold side import of secondary heat exchanger 9, the shell side of the secondary heat exchanger 9 The connection of the entrance of cold side outlet port and natural gas compressor thinks that natural gas compressor supplies；
The another way air exit of LNG holding bays or cargo hold 7 is connected to the suction inlet 1 of the injector 13, injector Outlet connection one-level knockout drum 14, the upper outlet of the one-level knockout drum 14 is connected to the Pyatyi heat exchanger 12 Shell side cold side import, the shell side cold side import of the shell side cold side outlet port of the Pyatyi heat exchanger 12 and the first-class heat exchanger 8 Connection, the shell side cold side outlet port of the first-class heat exchanger 8 are connected with the import 2 of nitrogen separation tank 3.
In Fig. 6, influenceed according to the design factor such as ship type, practical spatial arrangement of ship, replaced using Heat Exchangers For the one-level in ice chest in re-liquefied system to Pyatyi heat exchanger (8~12), re-liquefied system design and application ship class is realized The variation of type.
By the scheme in embodiment 2-6, it can be to the deformation of technical scheme and/or additional project in embodiment 1.
In addition, it is necessary to explanation, " include, including " described in this patent etc. is intended to including for nonexcludability, from And cause the process of a series of elements included in system, method or equipment etc., not only including described key element, also including it The intrinsic key element of the process in the key element and this system pointed out, method or equipment is not known in he.
For the explanation of above-mentioned disclosed case study on implementation so that those skilled in the art can implement this patent.This is specially Profit application is not intended to be limited to these above-mentioned case study on implementation, and is to fit to consistent with innovative point disclosed herein most wide Scope.

Claims (10)

  1. A kind of 1. re-liquefied system of ship, it is characterised in that including natural gas compressor (1), the outlet of natural gas compressor with Cooler (2) the shell side hot side import connection, cooler (2) the shell side hot side outlet are entered with the nitrogen separation tank (3) Mouth 1 is connected, and the gas exhaust piping all the way of nitrogen separation tank (3) outlet is connected with the import of the booster compression unit (4), institute The another way gas exhaust piping connection for stating the outlet of nitrogen separation tank (3) is supplied to gas consumption equipment；
    The outlet of the booster compression unit (4) passes through high pressure gas pipeline and the first-class heat exchanger (8) of the re-liquefied ice chest (5) Tube side hot side connects, and is connected successively by high pressure gas pipeline with one to Pyatyi heat exchanger, its tube side hot side in the re-liquefied ice chest Connect, the tube side hot side outlet of the Pyatyi heat exchanger (12) is connected with the high-pressure inlet of the injector (13), the injector (13) outlet is connected with the top of the one-level knockout drum (14), the lower section leakage fluid dram of the one-level knockout drum (14) with it is described The top connection of the second-order separation tank (15), the lower section leakage fluid dram of the second-order separation tank (15) are connected to LNG holding bays or cargo hold (7)；
    Boil-off gas discharged by the LNG holding bays or cargo hold (7) and be divided into two-way be supplied in re-liquefied ice chest with it is therein Heat exchanger exchanges heat；
    The air exit all the way of LNG holding bays or cargo hold (7) is connected to the shell side cold side of the Pyatyi heat exchanger (12), and described five Level heat exchanger (12) shell side cold side outlet port is connected to the first-class heat exchanger (8) shell side cold side import, the first-class heat exchanger (8) Shell side cold side outlet port and the entrance of natural gas compressor connect to be supplied to natural gas compressor；
    The another way air exit of LNG holding bays or cargo hold (7) is connected to the suction inlet 1 of the injector (13), injector (13) outlet connection one-level knockout drum (14), the upper outlet of the one-level knockout drum (14) are connected to the level Four heat exchanger (11) shell side cold side import, the shell side cold side outlet port of the level Four heat exchanger (11) and the shell side of the secondary heat exchanger (9) Cold side import is connected, and the shell side cold side outlet port of the secondary heat exchanger (9) is connected with the import 2 of nitrogen separation tank (3).
  2. 2. the re-liquefied system of ship as claimed in claim 2, it is characterised in that the one-level knockout drum (14) with two There is pressure regulator valve on the connecting line of level knockout drum (15), two level knockout drum (15) is connected to LNG by LNG loop pipes Storage cabin or cargo hold (7), and two level knockout drum (15) is connected by pipeline with the vacuum inlet feeds of injector (13), and the pipe There is the pressure regulator valve for being used for controlling two level knockout drum (15) interior pressure on road.
  3. 3. the re-liquefied system of ship as claimed in claim 1, it is characterised in that described three-level heat exchanger (10) connection refrigeration Agent system (6).
  4. 4. the re-liquefied system of ship as claimed in claim 1, it is characterised in that the gas consumption equipment includes main frame, hair One kind or its combination in motor, boiler, GVU.
  5. 5. the re-liquefied system of ship as claimed in claim 1, it is characterised in that described one to Pyatyi heat exchanger is that multiple flow changes Hot device.
  6. 6. the re-liquefied system of ship as claimed in claim 1, it is characterised in that boil-off gas is that LNG holding bays or cargo hold (7) are raw Into BOG, high pressure gas be by booster compression unit (4) processing after exhaust, circulating air be one-level knockout drum (14) above arrange The gas gone out.
  7. 7. the re-liquefied system of ship as claimed in claim 1, it is characterised in that the pressure quilt of the high pressure entry of the injector Control is more than 200 kilograms, and temperature is below -70 DEG C.
  8. 8. the re-liquefied system of ship as claimed in claim 1, it is characterised in that connect in the downstream of described booster compression unit High pressure compressor is connect to provide 200~300 kilograms of combustion gas by gas boosting to more than 300 kilograms and for MAN-ME-GI main frames.
  9. A kind of 9. re-liquefied system of ship, it is characterised in that including natural gas compressor (1), the outlet of natural gas compressor with Cooler (2) the shell side hot side import connection, cooler (2) the shell side hot side outlet are entered with the nitrogen separation tank (3) Mouth 1 is connected, and the gas exhaust piping all the way of nitrogen separation tank (3) outlet is connected with the import of the booster compression unit (4), institute The another way gas exhaust piping connection for stating the outlet of nitrogen separation tank (3) is supplied to gas consumption equipment；
    The outlet of the booster compression unit (4) passes through high pressure gas pipeline and the first-class heat exchanger (8) of the re-liquefied ice chest (5) Tube side hot side connects, and is connected successively by high pressure gas pipeline with one to Pyatyi heat exchanger, its tube side hot side in the re-liquefied ice chest Connect, the tube side hot side outlet of the Pyatyi heat exchanger (12) is connected with the high-pressure inlet of the injector (13), the injector (13) outlet is connected with the top of the one-level knockout drum (14), the lower section leakage fluid dram of the one-level knockout drum (14) with it is described The top connection of the second-order separation tank (15), the lower section leakage fluid dram of the second-order separation tank (15) are connected to LNG holding bays or cargo hold (7)；
    Boil-off gas discharged by the LNG holding bays or cargo hold (7) and be divided into two-way be supplied in re-liquefied ice chest with it is therein Heat exchanger exchanges heat；
    The air exit all the way of LNG holding bays or cargo hold (7) is connected to the shell side cold side of the level Four heat exchanger (11), and described four Level heat exchanger (11) shell side cold side outlet port is connected to the secondary heat exchanger (9) shell side cold side import, the secondary heat exchanger (9) Shell side cold side outlet port and the entrance of natural gas compressor connect to be supplied to natural gas compressor；
    The another way air exit of LNG holding bays or cargo hold (7) is connected to the suction inlet 1 of the injector (13), injector (13) outlet connection one-level knockout drum (14), the upper outlet of the one-level knockout drum (14) are connected to the Pyatyi heat exchanger (12) shell side cold side import, the shell side cold side outlet port of the Pyatyi heat exchanger (12) and the shell side of the first-class heat exchanger (8) Cold side import is connected, and the shell side cold side outlet port of the first-class heat exchanger (8) is connected with the import 2 of nitrogen separation tank (3).
  10. A kind of 10. liquifying method of the re-liquefied system of ship, it is characterised in that the liquefaction system include gas boosting unit and Re-liquefied ice chest；
    The gas suction inlet of gas boosting unit is connected to the shell side cold side of the secondary heat exchanger in re-liquefied ice chest, is inhaled by gas After the natural gas of entrance suction flows through natural gas compressor, cooler, nitrogen separation tank successively, booster compressor is supplied in respectively Gas consumption equipment in group and ship, and natural gas is transported to the multistage in re-liquefied ice chest after the supercharging of booster compression unit The tube side of heat exchanger simultaneously carries out heat exchange in multi-stage heat exchanger, the gas after exchanging heat and the boil-off gas for coming from LNG storage tank Together, the natural gas of low temperature liquid is condensed into carry out gas-liquid separation in one-level knockout drum by injector expansion；
    LNG liquid in one-level knockout drum is passed through after the second-order separation tank carries out decompression cooling, by the pressure with LNG holding bays LNG liquid is depressed into LNG holding bays or cargo hold by difference by pipeline；And the gas in one-level knockout drum in gas-liquid separation enters successively Enter the shell side cold side of level Four heat exchanger, secondary heat exchanger, be situated between as the heat exchange with level Four heat exchanger, the heat exchange of secondary heat exchanger tube side Matter, enter back into the nitrogen separation tank of gas boosting unit；Meanwhile the shell side cold side of the Pyatyi heat exchanger in re-liquefied ice chest is led to Cross pipeline connected with the gas-phase space of LNG storage tank using by the boil-off gas of natural gas as with Pyatyi heat exchanger and first-class heat exchanger The heat transferring medium of tube side heat exchange enters the natural gas compressor of gas boosting unit, so as to carry out next wheel compression, cooling, swollen Swollen, liquefaction cycle.
CN201710855062.4A 2017-09-20 2017-09-20 Ship reliquefaction system and method Active CN107702430B (en)

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CN111141107A (en) * 2020-01-03 2020-05-12 江苏科技大学 Marine VOC (volatile organic compound) and BOG (boil off gas) comprehensive liquefaction system and method
CN112219079A (en) * 2018-05-29 2021-01-12 恩凯 Boil-off gas reliquefaction system and boil-off gas reliquefaction method using same
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