NO136659B - - Google Patents

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Publication number
NO136659B
NO136659B NO4497/73A NO449773A NO136659B NO 136659 B NO136659 B NO 136659B NO 4497/73 A NO4497/73 A NO 4497/73A NO 449773 A NO449773 A NO 449773A NO 136659 B NO136659 B NO 136659B
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NO
Norway
Prior art keywords
gas
compressor
containers
ship
heat exchanger
Prior art date
Application number
NO4497/73A
Other languages
Norwegian (no)
Other versions
NO136659C (en
Inventor
K Witt
C Trepp
Original Assignee
Sulzer Ag
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Publication date
Application filed by Sulzer Ag filed Critical Sulzer Ag
Publication of NO136659B publication Critical patent/NO136659B/no
Publication of NO136659C publication Critical patent/NO136659C/en

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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
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • 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
    • F25J1/02—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
    • F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—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 only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration 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
    • F25J1/0275—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
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • 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
    • 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
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/60—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being hydrocarbons or a mixture of hydrocarbons

Description

Denne oppfinnelse vedrører et anlegg for behandling hhv. utnyttelse av den brennbare gass som dannes ved fordampning i væskebeholderne i et skip for transport av flytendegjort gass, med en første kompressor for fortetning av den gass som er suget ut og skal tilføres skipets drivanlegg, hvilken første kompressor på sugesiden over en varmeveksler står i forbindelse med beholderne. This invention relates to a facility for processing or utilization of the flammable gas that is formed by evaporation in the liquid containers in a ship for the transport of liquefied gas, with a first compressor for condensing the gas that has been sucked out and is to be supplied to the ship's propulsion system, which first compressor on the suction side above a heat exchanger is connected with the containers.

Selv ved den beste isolering av væskegassbeholdere dannes der brennbar gass som følge av fordampning eller for-dunstning, og det er blitt foreslått å forbrenne sådan gass i en forbrenningsanordning, f.eks. i en stempelforbrenningsmotor, en skipskjel eller et gassturbinanlegg som utgjør en del av skipets fremdriftsanlegg. Even with the best insulation of liquid gas containers, flammable gas is formed there as a result of vaporization or vaporization, and it has been proposed to burn such gas in a combustion device, e.g. in a reciprocating combustion engine, a ship's boiler or a gas turbine system that forms part of the ship's propulsion system.

Det har vist seg at den energimengde som kreves for skipets drivanlegg ved for vanlig skipsstørrelse og vanlige fartshastigheter er mindre enn den gassmengde som dannes. Hen-sikten med oppfinnelsen er å skaffe et anlegg som på økonomisk måte muliggjør reduksjon av fordampningstapene ved rekondensering av en del av gassen og som tillater utnyttelse av den var-me som må føres bort for rekondensering, til oppvarming av den gassmengde som er fordampet i væskebeholderne før denne komprimeres til et trykk som er tilpasset forbrenningsanordningen. It has been shown that the amount of energy required for the ship's propulsion system at normal ship sizes and normal speeds is less than the amount of gas that is formed. The purpose of the invention is to provide a facility that economically enables the reduction of evaporation losses by recondensing part of the gas and which allows the utilization of the heat that must be carried away for recondensation, for heating the amount of gas that has evaporated in the liquid containers before this are compressed to a pressure that is adapted to the combustion device.

Det særegne ved anlegget ifølge oppfinnelsen er at The peculiarity of the plant according to the invention is that

den første kompressor på trykksiden på den ene side står i for- . bindelse med skipets drivanlegg og på den annen side med en annen kompressor som på sin side på trykksiden er forbundet med varmeutveksleren, i hvilken den videre komprimerte gass for til-bakekjøling står i varmeutvekslende forhold til den gass som the first compressor on the pressure side on one side is in front of . connection with the ship's propulsion system and on the other hand with another compressor which in turn is connected on the pressure side to the heat exchanger, in which the further compressed gas for re-cooling is in a heat-exchange relationship with the gas which

er suget ut ved hjelp av den første kompressor og at strøm-ningsveien for den tilbakekjølte gass er forbundet med en avr spenningsventil som er forbundet med flytendegass-beholderne for tilbakeføring av den i det minste delvis flytendegjorte gass. Ved hjelp av anlegget ifølge oppfinnelsen oppnås at den kulde som finnes i hele den gasstrøm som er ført bort fra væskebeholderne, utnyttes til kjøling av den annen delstrøm og da1 i hele temperaturområdet for kjølingen og i det minste en del av omdannelsen av denne delstrøm til væske. Som følge av kompri-mering av hele gasstrømmen i den første kompressor arbeider ikke kompressoren som tilhører rekondenseringskretsen med lave sugetemperaturer, men med temperaturer som vanligvis ligger over 0° C. is sucked out by means of the first compressor and that the flow path for the cooled gas is connected to an avr voltage valve which is connected to the liquefied gas containers for returning the at least partially liquefied gas. With the help of the plant according to the invention, it is achieved that the cold contained in the entire gas flow that has been led away from the liquid containers is utilized for cooling the other sub-flow and then1 in the entire temperature range for the cooling and at least part of the conversion of this sub-flow into liquid . As a result of compression of the entire gas flow in the first compressor, the compressor belonging to the recondensation circuit does not work with low suction temperatures, but with temperatures that are usually above 0° C.

Hensiktsmessig anordnes der en utskillerinnretning i strømningsveien for den tilbakekjølte gass, hvilken innretnings gassrom over varmeutveksleren er forbundet med kompressorens trykkside og hvis væskerom er forbundet med flytendegass-beholderne. Appropriately, a separator device is arranged in the flow path for the cooled gas, which device's gas space above the heat exchanger is connected to the pressure side of the compressor and whose liquid space is connected to the liquefied gas containers.

Anlegget ifølge oppfinnelsen utgjør et enkelt anlegg med maskiner, til hvilke der ikke stilles særlig kompliserte krav. The plant according to the invention constitutes a simple plant with machines, for which no particularly complicated requirements are made.

Oppfinnelsen skal forklares nærmere ved et eksempel under henvisning til tegningen som viser skjematisk et anlegg; ifølge oppfinnelsen. The invention shall be explained in more detail by means of an example with reference to the drawing which schematically shows a plant; according to the invention.

Flytendegjort gass, f.éks. methan eller jordgass, er lagret i skipets væskegassbeholdere 10. Gass som fordampes i beholderne, føres ved en temperatur på f.eks. -150° C og ved omtrent atmosfærisk trykk gjennom en ledning 11 inn i en kjøle-vikling 12 som tilhører en varmeveksler 13, hvor fordampet gass på en måte som nærmere forklart nedenfor, bringes i varmeveks-lende forhold til den annen delstrøm. Gassen oppvarmes derved til f.eks. 10° C og strømmer gjennom en ledning 14 til en kompressor 15, hvor den komprimeres til et trykk på omtrent 2 atm. abs. med den derved følgende oppvarming til omtrent 60° C. Eri transportledning 16 som fortrinnsvis omfatter én etterkjøler 17, er delt i to grenledninger 18 og 19. Etterkjøleren 17 er over en ledning 38 koblet til en kjølemiddelkilde, f.eks. med kjølevann. i ledningen 38 er der anordnet en reguleringsventil 38a som påvirkes av en regulator 39 i samsvar méd informasjoner om temperaturforandringer i den komprimerte gass i ledningen 16, således at temperaturøkningen bevirker en økning av kjølin-gen og omvendt. Ledningen 18 fører den i etterkjøleren 17 til omtrent 40° C nedkjølte gass under det nevnte trykk til et ikke vist forbrenningssted som tilhører en dampgenerator for utvik-ling av damp til turbiner som driver skipet. I ledningen 18 er der anordnet en tilbakeslagsventil 20 og en trykkregulerings-ventil 21 som ved hjelp av en regulator 21a holder trykket i ledningen 18 på et forutbestemt nivå. Liquefied gas, e.g. methane or natural gas, is stored in the ship's liquid gas containers 10. Gas that evaporates in the containers is carried at a temperature of e.g. -150° C and at approximately atmospheric pressure through a line 11 into a cooling coil 12 belonging to a heat exchanger 13, where vaporized gas is brought into a heat-exchange relationship with the other partial flow in a manner as explained in more detail below. The gas is thereby heated to e.g. 10° C and flows through a line 14 to a compressor 15, where it is compressed to a pressure of approximately 2 atm. abs. with the consequent heating to approximately 60° C. Eri transport line 16, which preferably comprises one aftercooler 17, is divided into two branch lines 18 and 19. The aftercooler 17 is connected via a line 38 to a coolant source, e.g. with cooling water. in the line 38 there is arranged a control valve 38a which is influenced by a regulator 39 in accordance with information about temperature changes in the compressed gas in the line 16, so that the increase in temperature causes an increase in the cooling and vice versa. The line 18 leads the gas cooled to approximately 40° C in the aftercooler 17 under the mentioned pressure to a combustion place not shown which belongs to a steam generator for developing steam for turbines that drive the ship. A non-return valve 20 and a pressure regulating valve 21 are arranged in the line 18 which, by means of a regulator 21a, keeps the pressure in the line 18 at a predetermined level.

Kompressoren 15 har en drivmotor 22, hvis turtall reguleres av en regulator 23 i samsvar med trykket i ledningen 11. Anordningen er således utført at stigende trykk i ledningen 11 som følge av gassfordampning i beholderne 10 bevirker øking av turtallet og omvendt. The compressor 15 has a drive motor 22, the speed of which is regulated by a regulator 23 in accordance with the pressure in the line 11. The device is designed so that rising pressure in the line 11 as a result of gas evaporation in the containers 10 causes an increase in the speed and vice versa.

Grenledningen 19 fører den andre delstrøm inn i en annen kompressor 24 som er utført som en tretrinns stempelkom-pressor som drives av en skjematisk vist elektromotor 25. Mel-lom kompressorens enkelte trinn og ved utløpet av delstrømmen fra kompressorens siste trinn er der anordnet etterkjølere 26. The branch line 19 leads the second partial flow into another compressor 24, which is designed as a three-stage reciprocating compressor driven by a diagrammatically shown electric motor 25. Aftercoolers 26 are arranged between the individual stages of the compressor and at the exit of the partial flow from the last stage of the compressor. .

Delstrømgassen som er blitt komprimert til omtrent The partial flow gas that has been compressed to approx

42 atm. abs. og som har en temperatur på f.eks. 40° C, strømmer så gjennom en ledning 27 til varmeveksleren 13 som omfatter kjøleviklingen 12, og nedkjøles her til. f.eks. -120° C. Den således nedkjølte gass føres gjennom en ledning 28 fra varmeveksleren 13 til en ekspansjonsventil 29 og avspennes her til et trykk på omtrent 2 atm. abs., dvs. leveringstrykket fra den første kompressor 15. Ekspansjonsventilen reguleres av en regulator 30, således at det ønskede trykk i ledningen 28 opp-rettholdes . 42 atm. abs. and which has a temperature of e.g. 40° C, then flows through a line 27 to the heat exchanger 13 which includes the cooling coil 12, and is cooled down here. e.g. -120° C. The thus cooled gas is led through a line 28 from the heat exchanger 13 to an expansion valve 29 and is here relaxed to a pressure of approximately 2 atm. abs., i.e. the delivery pressure from the first compressor 15. The expansion valve is regulated by a regulator 30, so that the desired pressure in the line 28 is maintained.

Fra ekspansjonsventilen strømmer den i det minste delvis flytendegjorte gass gjennom ledningen 31 til en utskiller 33 og oppsamles i dennes nedre del. Utskilleren er utstyrt med en nivåregulator 34 som virker på en ventil.35 i en ledning 36; som fører til beholderne 10, således at den flytendegjorte gass av en pumpe 4 6 kan føres tilbake til beholderne 10 gjennom nevnte ledning. From the expansion valve, the at least partially liquefied gas flows through line 31 to a separator 33 and is collected in its lower part. The separator is equipped with a level regulator 34 which acts on a valve 35 in a line 36; which leads to the containers 10, so that the liquefied gas by a pump 4 6 can be led back to the containers 10 through said line.

Utskilleren 33 er over en ledning 41 forbundet med en ytterligere kjølevikling 42 i varmeveksleren 13. Lettflyktige gassbestanddeler, særlig nitrogenholdige sådanne, kan føres bort gjennom ledningen 41 og brukes til nedkjøling av delstrøm-men som skal gjøres flytende og som strømmer gjennom varmeveks+ leren. De nevnte bestanddeler føres så gjennom en ledning 43 fra varmeveksleren til ledningen 18 og blandes méd den delstrøm som skal forbrennes. The separator 33 is connected via a line 41 to a further cooling winding 42 in the heat exchanger 13. Volatile gas constituents, particularly nitrogen-containing ones, can be led away through the line 41 and used for cooling the partial flow which is to be liquefied and which flows through the heat exchanger. The aforementioned components are then passed through a line 43 from the heat exchanger to the line 18 and mixed with the partial flow to be burned.

Oppfinnelsen er ikke begrenset til utførelseseksemplet. Delstrømmen som er bestemt for forbrenning, kan f.eks. i stedet for å tilføres en kjelfyring, føres til en dieselmotor med et trykk på f.eks. 8 atm. abs. eller et gassturbinanlégg som driver skipet. Videre er det også mulig å redusere trykket i eks-pans jonsventilen 29 rett ned til trykket i beholderne 10 og derved gi avkall på utskilling av lettflyktige gasser. The invention is not limited to the embodiment. The partial flow that is intended for combustion can, e.g. instead of being fed to a boiler, fed to a diesel engine with a pressure of e.g. 8 atm. abs. or a gas turbine installation that powers the ship. Furthermore, it is also possible to reduce the pressure in the expansion valve 29 right down to the pressure in the containers 10 and thereby dispense with the release of volatile gases.

Claims (2)

1. Anlegg for behandling henholdsvis utnyttelse au den brennbare gass som dannes ved fordampning i væskebeholderne i et skip for transport av flytendegjort gass, med en første kompressor (15) for fortetning av den gass som er suget ut og skal tilføres skipets drivanlegg, hvilken første kompressor på sugesiden over en varmeveksler (13) står i forbindelse med beholderne (10) for f lytendegjort gass, karakterisert ved at den første kompressor (15) på trykksiden på den ene side står i forbindelse med.skipets drivanlegg og på den annen side med en annen kompressor (24) som på sin side på trykksiden er forbundet med varmeutveksleren (13), i hvilken den videre komprimerte gass for tilbakekjøling står i varmeutvekslende forhold til den gass som er suget ut ved hjelp av den første kompressor (15) og at strømningsveien for den tilbakekjølte gass er forbundet med en avspenningsventil (29) som er forbundet med f lytendegass-beholderne (10) for tilbakeføring av den i det minste delvis f lytendegjorte gass.1. Facility for treatment or utilization of the flammable gas that is formed by evaporation in the liquid containers in a ship for the transport of liquefied gas, with a first compressor (15) for condensing the gas that has been sucked out and is to be supplied to the ship's propulsion system, which first compressor on the suction side above a heat exchanger (13) is in connection with the containers (10) for liquefied gas, characterized in that the first compressor (15) on the pressure side is on the one hand in connection with the ship's propulsion system and on the other hand with another compressor (24) which in turn is connected on the pressure side to the heat exchanger (13), in which the further compressed gas for recooling is in a heat-exchange relationship with the gas which has been sucked out by means of the first compressor (15) and that the flow path for the cooled gas is connected to a relief valve (29) which is connected to the liquid end gas containers (10) for returning the at least partially liquid end tea gas. 2. Anlegg i henhold til krav 1, karakterisert ved en utskillerinnretning (33) i strømnings veien for den til-bakekjølte gass og hvis gassrom over varmeutveksleren (13) er forbundet med kompressorens (15) trykkside og hvis væskerom er forbundet med f lytendegass-beholderne (10).2. Plant according to claim 1, characterized by a separator device (33) in the flow path for the cooled gas and whose gas space above the heat exchanger (13) is connected to the pressure side of the compressor (15) and whose liquid space is connected to the liquid gas the containers (10).
NO4497/73A 1972-12-11 1973-11-26 SYSTEMS FOR TREATMENT OR UTILIZATION OF THE FLAMMABLE GAS FORMED BY EVAPORATION DURING TRANSPORT SHIPS OF LIQUID GAS NO136659C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1795872A CH561620A5 (en) 1972-12-11 1972-12-11

Publications (2)

Publication Number Publication Date
NO136659B true NO136659B (en) 1977-07-04
NO136659C NO136659C (en) 1977-10-12

Family

ID=4429378

Family Applications (1)

Application Number Title Priority Date Filing Date
NO4497/73A NO136659C (en) 1972-12-11 1973-11-26 SYSTEMS FOR TREATMENT OR UTILIZATION OF THE FLAMMABLE GAS FORMED BY EVAPORATION DURING TRANSPORT SHIPS OF LIQUID GAS

Country Status (15)

Country Link
US (1) US3885394A (en)
JP (1) JPS4988904A (en)
BE (1) BE808420A (en)
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CH561620A5 (en) 1975-05-15

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