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    Method and apparatus for producing liquified natural gas
    52.
    发明授权
    Method and apparatus for producing liquified natural gas 有权
    生产液化天然气的方法和设备

    公开(公告)号：US06269656B1

    公开(公告)日：2001-08-07

    申请号：US09156241

    申请日：1998-09-18

    Applicant: Richard P. Johnston

    Inventor： Richard P. Johnston

    IPC: F25J100

    CPC classification number: F25J1/0022 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0201 ,  F25J1/0232 ,  F25J2210/06

    Abstract: Both a method and apparatus for producing liquified natural gas (LNG) at a well head or other source where cool high pressure natural gas is provided. The natural gas flow from the source is cleaned, if required, and is split into two portions. The first flow portion goes to a primary heat exchanger, then to a second heat exchanger or super cooler, and is thereafter throttled into a LNG tank wherein a part thereof flashes to liquid natural gas and a part thereof becomes a very cold saturated vapor to be vented from the LNG tank. This vent remainder of the first flow portion enters the super cooler as a coolant therefor. The second flow portion enters an expander where work is extracted and the temperature and pressure of the second flow portion are lowered. The cold lower pressure second portion combines with the partially warmed vent remainder of the first portion from the super cooler and passes into the primary heat exchanger as the initial coolant for the first portion. The combined warmed second portion and first portion vent remainder then pass out of the system into a low pressure receiver such as a pipeline. The combined portions are at a pressure equal to or greater than that in the receiver. In a second embodiment the supercooler is eliminated, somewhat reducing the liquid natural gas produced.

    Abstract translation: 无论是提供冷却高压天然气的井头还是其他源处的液化天然气（LNG）的方法和装置。 如果需要，来自源的天然气流被清洁，并被分成两部分。 第一流动部分进入主热交换器，然后进入第二热交换器或超级冷却器，然后被节流到LNG罐中，其中其一部分闪烁到液态天然气，并且其一部分变成非常冷的饱和蒸气 从LNG罐排出。 第一流动部分的排气剩余部分作为冷却剂进入超级冷却器。 第二流动部分进入膨胀器，在该膨胀器中提取工件并降低第二流动部分的温度和压力。 冷的低压第二部分与来自超级冷却器的第一部分的部分加热的通风口剩余部分结合，并作为第一部分的初始冷却剂进入主要热交换器。 组合的加热的第二部分和第一部分通气口部分然后从系统中排出到诸如管道的低压接收器中。 组合部分处于等于或大于接收器中的压力。 在第二实施例中，消除了过冷却器，稍微减少了所生产的液体天然气。

    Station and process for dispensing a reduced-pressure gas
    53.
    发明授权
    Station and process for dispensing a reduced-pressure gas 失效
    用于分配减压气体的站和处理

    公开(公告)号：US6138473A

    公开(公告)日：2000-10-31

    申请号：US260493

    申请日：1999-03-02

    Applicant: Aymeric Boyer-Vidal

    Inventor： Aymeric Boyer-Vidal

    IPC: F17D1/04 ,  F17D1/07 ,  F25J1/00

    CPC classification number: F17D1/04 ,  F17D1/07 ,  F25J1/001 ,  F25J1/0012 ,  F25J1/0017 ,  F25J1/0022 ,  F25J1/0027 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0201 ,  F25J1/0232 ,  F25J2230/20 ,  F25J2230/30 ,  Y02E60/34

    Abstract: A station for dispensing a gas, in particular nitrogen, under a dispensing pressure, includes a line (10) for gas inlet under an inlet high pressure, a line (14) for dispensing the gas under a lower dispensing pressure, and a device (16) for reducing the pressure of the gas to be dispensed from the inlet pressure to the dispensing pressure. The pressure-reducing device (16) includes a machine for pressure reduction with external work production. The station includes upstream of the pressure-reducing device (16), a conduit (18) for dividing the inlet gas into a fraction to be dispensed and a complementary fraction, downstream of the conduit (18), a device (20) for liquefaction of the complementary fraction of the inlet gas that includes a heat exchanger (26) for exchanging heat with the reduced-pressure fraction of the inlet gas, and a reservoir (40) for collecting the liquefied complementary fraction.

    Abstract translation: 用于在分配压力下分配气体，特别是氮气的站包括用于在入口高压下进气的管线（10），用于在较低分配压力下分配气体的管线（14）和装置（ 16），用于将从所述入口压力分配的气体的压力降低到所述分配压力。 减压装置（16）包括用于通过外部加工生产减压的机器。 该站包括减压装置（16）的上游，用于将入口气体分成待分配的馏分的导管（18）和在导管（18）下游的互补部分，用于液化的装置（20） 包括用于与入口气体的减压部分进行热交换的热交换器（26）的入口气体的互补部分，以及用于收集液化的互补部分的储存器（40）。

    Method and apparatus for the partial conversion of natural gas to liquid natural gas
    54.
    发明授权
    Method and apparatus for the partial conversion of natural gas to liquid natural gas 有权
    天然气部分转化为液态天然气的方法和装置

    公开(公告)号：US6085546A

    公开(公告)日：2000-07-11

    申请号：US157026

    申请日：1998-09-18

    Applicant: Richard P. Johnston

    Inventor： Richard P. Johnston

    IPC: F25J1/00 ,  F25J1/02

    CPC classification number: F25J1/0022 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0201 ,  F25J1/0232 ,  F25J1/0264 ,  F25J2210/06 ,  F25J2230/08 ,  F25J2230/20 ,  F25J2230/60 ,  F25J2245/02

    Abstract: A method and an apparatus for producing liquid natural gas (LNG) from a well head or other source of cool, high pressure natural gas. The natural gas from the source is purified and split into first and second flow portions. The first flow portion is split into two parts passing through first and second heat exchangers. The two parts are thereafter recombined and throttled into a LNG tank wherein part thereof flashes to liquid natural gas and a part thereof constitutes a very cold saturated vapor to be vented from the LNG tank. The vent remainder of the first flow portion is used as a coolant for the second heat exchanger and is then conveyed to a low pressure receiver such as a collection pipeline, the vent remainder having a pressure equal to or greater than the receiver. The second flow portion enters an expander wherein its pressure is lowered below that of the receiver and its temperature is lowered accordingly. The second flow portion is used as a coolant for the first heat exchanger and thereafter enters a compressor run by expander work wherein its pressure is raised to a level equal to or greater than that of the receiver. The second flow portion passes to the receiver. Under some conditions of pressure at the source and efficiency levels of the equipment used, the second heat exchanger can be eliminated and all of the first flow portion flashes to liquid natural gas, as is shown in the second embodiment of the present invention.

    Abstract translation: 一种用于从井头或其他冷却高压天然气源生产液态天然气（LNG）的方法和装置。 来自源的天然气被净化并分成第一和第二流动部分。 第一流动部分被分成穿过第一和第二热交换器的两部分。 然后将两部分重组并节流到LNG罐中，其中其中的一部分闪烁到液态天然气中，其一部分构成非常冷的饱和蒸汽，以从LNG罐排出。 第一流动部分的排气余量用作第二热交换器的冷却剂，然后被输送到诸如收集管线的低压接收器，排气余量具有等于或大于接收器的压力。 第二流动部分进入膨胀器，其中压力降低到低于接收器的压力，并且其温度相应降低。 第二流动部分用作第一热交换器的冷却剂，然后通过膨胀器工作进入压缩机运行，其中其压力升高到等于或大于接收器的水平。 第二流动部分传递到接收器。 在所使用的设备的源和效率水平的一些压力条件下，如本发明的第二实施例所示，可以消除第二热交换器并且所有第一流动部分都闪烁到液体天然气。

    Expander cycle for natural gas liquefication with split feed stream
    55.
    发明授权
    Expander cycle for natural gas liquefication with split feed stream 失效
    用于自然进气流量的膨胀剂循环

    公开(公告)号：US3503220A

    公开(公告)日：1970-03-31

    申请号：US3503220D

    申请日：1967-07-27

    Applicant: CHICAGO BRIDGE & IRON CO

    Inventor： DESAI SUDHIR HARILAL

    IPC: F25J1/00 ,  F25J1/02 ,  F25J3/08

    CPC classification number: F25J1/0022 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0045 ,  F25J1/0201 ,  F25J1/0232 ,  F25J2210/06 ,  F25J2220/64 ,  F25J2220/66 ,  F25J2230/20 ,  F25J2230/60 ,  F25J2245/90 ,  F25J2270/06

    Abstract: 1,180,496. Natural gas liquefaction process. CHICAGO BRIDGE & IRON CO. 20 Feb., 1968 [27 July, 1967], No. 8221/68. Heading F4P. Liquefaction of compressed natural gas containing carbon dioxide, methane and higher hydrocarbons is effected by dividing the feed gas into first and second streams 12, 30 cooling the first stream by work-expansion in a turbine 18 without solidification of carbon dioxide, absorbing carbon dioxide at 31 from the second stream 30, cooling the latter to effect partial liquefaction in heat exchangers 24, 23, 22 in countercurrent to said expanded first stream, separating at 62 an impure liquid fraction containing heavy hydrocarbons from said cooled second stream, expanding this separated liquid at a valve 64 and using the cold so produced in a terminal exchanger 67 to liquefy vapour withdrawn from the separator 62 through a line 70. Most of the liquid methane is expanded at a valve 72 into a storage tank 74 at about atmospheric pressure whilst a minor portion of liquid methane is expanded at a valve 77 and joins the cold vapour leaving valve 64. A phase separator 44 is interposed in the second stream between exchangers 24, 23 and separated higher hydrocarbons are expanded at a valve 48 whilst a portion of the uncondensed vapour is withdrawn through a line 45, expanded in a turbine 37 and the two portions combined in a line 50 with the aforementioned expanded portions from separator 62. Effluent from tank 74 is compressed at 79, added to the first feed stream leaving turbine 18 and is then warmed in exchangers 22, 23, 24, 13 and fed into a consumer line 26.

    Process for liquefying natural gas
    57.
    发明授权
    Process for liquefying natural gas 失效
    液化天然气的工艺

    公开(公告)号：US3312073A

    公开(公告)日：1967-04-04

    申请号：US41572364

    申请日：1964-12-03

    Applicant: CONCH INT METHANE LTD

    Inventor： GLOVER JACKSON ROBERT ,  ALEXANDER HARMENS

    IPC: F25J1/00 ,  F25J1/02 ,  F25J3/06

    CPC classification number: F25J1/0022 ,  F25J1/0035 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0201 ,  F25J1/023 ,  F25J1/0232 ,  F25J2205/20 ,  F25J2205/60 ,  F25J2205/70 ,  F25J2210/06 ,  F25J2220/62 ,  F25J2220/66 ,  F25J2230/20 ,  F25J2230/32 ,  F25J2230/60

    Abstract: 1,011,453. Gas liquefaction process. CONCH INTERNATIONAL METHANE Ltd. July 10, 1964 [Jan. 23, 1964], No. 3017/64. Heading F4P. A process for the production of natural gas at a pressure below well head pressure and for the production of liquefied gas at a still lower pressure comprises isentropically expanding at a turbine 44 a first portion 8 of well head gas, passing the so cooled gas in indirect heat exchange at 17 with a second portion 9 of well head gas and feeding it into a distribution line 18, further cooling the said second portion of well head gas at 23, isentropically expanding it at a turbine 25, further cooling the cold expanded gas at 27 and isenthalpically expanding it at a valve 29 to produce flash gas and liquefied gas in a vessel 30 from which product liquefied gas is withdrawn by a pump 31 for storage in a vessel 33 whilst flash gas is withdrawn from vessel 30, used to cool exchangers 23, 27 after which it is compressed at 37 and passed to the distribution line 18. The first portion of well head gas is freed of methane hydrate in a separator 11 and the second portion is dried by passage through alternating molecular sieves 19, 19a which are regenerated by bleeding substantially pure methane from the compressor 37, heating at 40 and delivering it through a line 42 for use as fuel gas. The carbon dioxide content of the well head gas collects as a slurry in flash vessel 30 and is removed from the liquefied product by a centrifugal separator 32. In a modification, gas leaving turbine 25 is freed of nitrogen by absorption.

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