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    Natural gas liquefaction process
    5.
    发明专利
    Natural gas liquefaction process 未知

    公开(公告)号：AU2004274706A1

    公开(公告)日：2005-03-31

    申请号：AU2004274706

    申请日：2004-09-23

    Applicant: LINDE AG ,  STATOIL ASA

    Inventor： FRANKE HUBERT ,  PETTERSEN JOSTEIN ,  BOLT MANFRED ,  BAUER HEINZ ,  PAUROLA PENTTI ,  SCHIER MARC ,  SAPPER RAINER ,  FREDHEIM ARNE OLAV

    IPC: F25J1/02 ,  F25B1/10 ,  F25B5/02 ,  F25B9/00 ,  F25B9/02

    Abstract: A method of liquefying a hydrocarbon-rich gas, wherein the gas flows through a cascade of three refrigeration stages, each stage comprising a refrigerant circuit and a compressor, wherein at least part of the flow of refrigerant from the second circuit is used for the pre-cooling of the hydrocarbon rich gas in the first refrigeration stage. This balances the load on each of the compressors. By standardizing the drive units and compressors of the three coolant circuits, it is possible to maximize the attainable liquefaction capacity of the liquefaction process using tried-and-trusted drive units and compressors respectively. This method can be applied to mixed refrigerant cascades and circuits with a carbon dioxide pre-cooling circuit. This latter option has benefits for offshore use where large amounts of hydrocarbons are undesirable.

    6.
    发明专利
    未知

    公开(公告)号：NO20050944L

    公开(公告)日：2005-02-22

    申请号：NO20050944

    申请日：2005-02-22

    Applicant: STATOIL ASA

    Inventor： PAUROLA PENTTI ,  STOCKMANN RUDOLF ,  GWINNER MARTIN

    IPC: F25J1/02 ,  F25J3/02

    Abstract: A process for liquefying a flow of natural gas with simultaneous recovery of a C 3 /C 4 -rich fraction is described, whereby the liquefaction of the flow of natural gas is carried out in heat exchange for at least one refrigerant and/or mixed refrigerant flow, and the flow of natural gas that is to be liquefied, after precooling, is subjected to a rectifying column, in which higher hydrocarbons are separated from the flow of natural gas, and then is subjected to further cooling and liquefaction, whereby a C 2+ -rich fraction that is recovered in the subsequent cooling of the flow of natural gas is fed to the rectifying column as a reflux liquid. According to the invention, a C 4 /C 5 -rich fraction ( 20, 35 ) is fed directly and/or indirectly to rectifying column (T 1 ) as an additional reflux liquid, whereby the feed point of the C 4 /C 5 -rich [fraction ( 20, 35 ) is located at the top of rectifying column (T 1 ) or is identical to the feed point of the C 2+ -rich fraction ( 5 ).]

    Method for liquefying a stream rich in hydrocarbons
    8.
    发明专利
    Method for liquefying a stream rich in hydrocarbons 未知

    公开(公告)号：AU7643698A

    公开(公告)日：1998-11-13

    申请号：AU7643698

    申请日：1998-04-15

    Applicant: LINDE AG ,  STATOIL ASA

    Inventor： STOCKMANN RUDOLF ,  FORG WOLFGANG ,  BOLT MANFRED ,  STEINBAUER MANFRED ,  PFEIFFER CHRISTIAN ,  PAUROLA PENTTI ,  FREDHEIM ARNE OLAV ,  SORENSEN OYSTEIN

    IPC: F25J1/02 ,  F25J3/02

    Abstract: The invention relates to a method for liquefying a stream rich in hydrocarbons, especially a stream of natural gas, by the indirect exchange of heat with the refrigerants in a closed-circuit cascade of mixed refrigerants. According to the invention, said closed-circuit cascade of mixed refrigerants consists of at least 3 circuits of mixed refrigerants, with each circuit comprising different refrigerants. The first of the three mixed refrigerant circuits is used for pre-cooling (E1), the second for liquefying E2), and the third for super-cooling (E3) the hydrocarbon-rich stream (1) to be liquefied. The method provided for in the invention reduces specific energy consumption and investment costs since the three circuits of mixed refrigerants are or can be optimally adjusted to the enthalpy temperature curves of the hydrocarbon-rich stream to be liquefied and the refrigerant mixtures.

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