EP0818527A2 - Procédé pour la regazification du gaz naturel liquifié - Google Patents

Procédé pour la regazification du gaz naturel liquifié Download PDF

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Publication number
EP0818527A2
EP0818527A2 EP97110251A EP97110251A EP0818527A2 EP 0818527 A2 EP0818527 A2 EP 0818527A2 EP 97110251 A EP97110251 A EP 97110251A EP 97110251 A EP97110251 A EP 97110251A EP 0818527 A2 EP0818527 A2 EP 0818527A2
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EP
European Patent Office
Prior art keywords
operating fluid
process according
lng
liquid phase
thermal exchange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97110251A
Other languages
German (de)
English (en)
Other versions
EP0818527A3 (fr
Inventor
Giorgio Soave
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eni Tecnologie SpA
Original Assignee
Eni Tecnologie SpA
Eniricerche SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eni Tecnologie SpA, Eniricerche SpA filed Critical Eni Tecnologie SpA
Publication of EP0818527A2 publication Critical patent/EP0818527A2/fr
Publication of EP0818527A3 publication Critical patent/EP0818527A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/035—High pressure, i.e. between 10 and 80 bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0332—Heat exchange with the fluid by heating by burning a combustible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/01—Purifying the fluid
    • F17C2265/015—Purifying the fluid by separating
    • F17C2265/017—Purifying the fluid by separating different phases of a same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/02—Mixing fluids
    • F17C2265/025—Mixing fluids different fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/07—Generating electrical power as side effect

Definitions

  • the present invention relates to a process for regasifying LNG (liquified natural gas) which allows the cold produced in the regasification itself to be used to generate mechanical energy.
  • LNG is stored at atmospheric pressure and at its boiling point (about -160°C). To regasify it and send it for distribution it is energetically convenient to pump it first at gasduct pressure (70 bars) and regasify it at this pressure.
  • the regasification can be obtained in two ways:
  • the first solution although relatively economical with respect to the plant cost, is rather expensive in the operating costs.
  • the second on the other hand, has low operating costs and is therefore generally preferred for large regasification plants, but requires strong investments for the heat exchangers (low ⁇ T) and above all for the removal, treatment and discharge operations of the sea water which, to avoid thermal short circuits, must be removed and discharged in points which are distant from each other. In addition it creates problems of an environmental nature (to the extent that the regulations in force have fixed a maximum ⁇ T of the water).
  • the regasification plant for example, could be coupled with a conventional thermal plant, using the heat discharged from this and thus allowing an improved efficiency of the thermodynamic cycle, as the condensation of the discharge vapor of the turbines could be carried out at lower temperatures than the normal ones of 40-50°C.
  • Patent application IT-26948 A74 claims a regasification plant using a closed nitrogen cycle which allows a good yield (from 58 to 60%) and a good power production (28-29 MW per 10 9 Nm 3 /a, which however has problems linked to the infiltration of natural gas into the nitrogen.
  • the process for regasifying LNG, of the present invention is carried out by means of an open thermodynamic cycle using as operating fluid part of the regasified LNG itself, which allows the cold produced in the regasification to be exploited to generate mechanical energy.
  • the open thermodynamic cycle preferably comprises the following steps:
  • liquid phase after being pumped, is also sent, at least in part, to the step in which the mixing of the LNG regasified with the compressed gas takes place or is removed, at least in part, to separate and/or recover the heavier components.
  • the liquid phase before being mixed with the regassified GNL and with the compressed gas, can be preheated in order to exploit the cold and diminish the irreversibilities linked to the mixing of streams at very different temperatures, or it can be gradually injected into the vapor from which is was previously separated, along the compression path, to lower its temperature and reduce the compression operation.
  • the operating conditions prefferably be such as to have two streams to be mixed at the same temperature.
  • thermodynamic yield it is preferable for the heating to take place with an external heating source having a temperature higher than 600°C, which can consist of, for example, combustion fumes.
  • the heating of the operating fluid can be carried out in one or more steps: when several steps are used, gas turbine discharges can also be adopted.
  • the LNG (1) is pumped (in P1) at a pressure of 70 bars, and is then heated (in E1) to room temperature with the heat obtained from the gaseous operating fluid (11) of the open thermodynamic cycle.
  • the LNG obtained from the regasification (3) is mixed in the mixer (M) with the gaseous operating fluid under pressure (8) and with the possible liquid operating fluid (7).
  • the gaseous mixture obtained (12) is divided between the product (13) and the gas (14) which must effect the cycle as operating fluid.
  • the gas (14) is preheated in the exchanger (E2) in countercurrent with the same gas leaving (10) the expansion turbine (EX1), then the preheated stream (15) is heated with an external heating source (E3) at the highest possible temperature, and the stream obtained (9) is then expanded in the turbine (EX1) at a suitable intermediate pressure.
  • the expanded stream (10) is cooled, first in the exchanger (E2) in countercurrent with the same gas under pressure (14), and then, completing the cooling, in the exchanger (E1) with the LNG (2).
  • the cooled stream (4) if it contains a liquid phase, is separated in the separator (F1) into a liquid phase (5) and a gas phase (6), which is compressed in the compressor (C1) at a pressure of 70 bars and sent (8) to the mixer (M).
  • the liquid phase (5), after being pumped (in P2) at a pressure of 70 bars can be sent (7), at least in part, to the mixer (M), where it vaporizes, or it can be removed (16) to obtain liquid products lightening the gas produced.
  • the process scheme is analogous to that represented in the enclosed figure without separating and/or recovering however the possible liquid phase 7 (i.e. the stream 16 is not present).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP97110251A 1996-07-11 1997-06-23 Procédé pour la regazification du gaz naturel liquifié Withdrawn EP0818527A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI001430A IT1283140B1 (it) 1996-07-11 1996-07-11 Procedimento per rigassificare il gas naturale liquefatto
ITMI961430 1996-07-11

Publications (2)

Publication Number Publication Date
EP0818527A2 true EP0818527A2 (fr) 1998-01-14
EP0818527A3 EP0818527A3 (fr) 1998-12-16

Family

ID=11374566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110251A Withdrawn EP0818527A3 (fr) 1996-07-11 1997-06-23 Procédé pour la regazification du gaz naturel liquifié

Country Status (2)

Country Link
EP (1) EP0818527A3 (fr)
IT (1) IT1283140B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2879720A1 (fr) * 2004-12-17 2006-06-23 Snecma Moteurs Sa Systeme de compression-evaporation pour gaz liquefie
WO2007144103A1 (fr) * 2006-06-14 2007-12-21 Eni S.P.A. Procédé et installation permettant la vaporisation de gaz naturel liquéfié et le stockage de celui-ci
EP2123968A1 (fr) * 2008-05-20 2009-11-25 Sincron S.r.l. Installation de gazification, par exemple pour méthane , comprenant un appareil de type Stirling
US8156758B2 (en) 2004-09-14 2012-04-17 Exxonmobil Upstream Research Company Method of extracting ethane from liquefied natural gas
WO2014111295A1 (fr) * 2013-01-16 2014-07-24 Siemens Aktiengesellschaft Dispositif de regazéification de gaz naturel liquéfié et procédé associé
FR3009058A1 (fr) * 2013-07-29 2015-01-30 Air Liquide Procede et installation de production de gaz sous pression

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3154928A (en) * 1962-04-24 1964-11-03 Conch Int Methane Ltd Gasification of a liquid gas with simultaneous production of mechanical energy
GB1011518A (en) * 1964-08-10 1965-12-01 Conch Int Methane Ltd Method for the production of ethylene from a liquified natural gas
US3849096A (en) * 1969-07-07 1974-11-19 Lummus Co Fractionating lng utilized as refrigerant under varying loads
IT1020462B (it) * 1974-09-05 1977-12-20 Snam Progetti Impianto di rigassificazione di gas naturale

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8156758B2 (en) 2004-09-14 2012-04-17 Exxonmobil Upstream Research Company Method of extracting ethane from liquefied natural gas
FR2879720A1 (fr) * 2004-12-17 2006-06-23 Snecma Moteurs Sa Systeme de compression-evaporation pour gaz liquefie
EP1672270A3 (fr) * 2004-12-17 2006-09-27 Snecma Système de compression-évaporation pour gaz liquéfié
US7406830B2 (en) 2004-12-17 2008-08-05 Snecma Compression-evaporation system for liquefied gas
WO2007144103A1 (fr) * 2006-06-14 2007-12-21 Eni S.P.A. Procédé et installation permettant la vaporisation de gaz naturel liquéfié et le stockage de celui-ci
RU2464480C2 (ru) * 2006-06-14 2012-10-20 ЭНИ С.п.А Способ и устройство для испарения сжиженного природного газа и его хранения
EP2123968A1 (fr) * 2008-05-20 2009-11-25 Sincron S.r.l. Installation de gazification, par exemple pour méthane , comprenant un appareil de type Stirling
WO2009141118A1 (fr) * 2008-05-20 2009-11-26 Sincron S.R.L. Installation de gazéification, en particulier pour du méthane, comprenant un moteur stirling
WO2014111295A1 (fr) * 2013-01-16 2014-07-24 Siemens Aktiengesellschaft Dispositif de regazéification de gaz naturel liquéfié et procédé associé
FR3009058A1 (fr) * 2013-07-29 2015-01-30 Air Liquide Procede et installation de production de gaz sous pression

Also Published As

Publication number Publication date
ITMI961430A1 (it) 1998-01-11
IT1283140B1 (it) 1998-04-07
ITMI961430A0 (fr) 1996-07-11
EP0818527A3 (fr) 1998-12-16

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