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    • 5. 发明授权
    • 액화천연가스내의저비점을갖는성분의양을감소시키는방법
    • KR100432208B1
    • 2004-07-16
    • KR1019980706574
    • 1997-02-27
    • 쉘 인터내셔날 리써취 마트샤피지 비.브이.
    • 엘리온비베카야코바클라인나겔포오르트로버트빈크코르넬리스얀
    • F25J3/02
    • F25J3/029F25J3/0209F25J3/0233F25J3/0257F25J2200/02F25J2200/40F25J2200/70F25J2200/90F25J2205/04F25J2215/04F25J2240/30F25J2240/40F25J2270/02
    • PCT No. PCT/EP97/01000 Sec. 371 Date Aug. 5, 1998 Sec. 102(e) Date Aug. 5, 1998 PCT Filed Feb. 27, 1997 PCT Pub. No. WO97/32172 PCT Pub. Date Sep. 4, 1997Method of reducing the amount of components having low boiling points in liquefied natural gas comprising passing the liquefied natural gas at liquefaction pressure through the hot side of an external heat exchanger to obtain cooled liquefied natural gas, allowing the cooled liquefied natural gas to expand dynamically to an intermediate pressure and statically to a low pressure to obtain expanded fluid, and introducing expanded fluid into the upper part of a fractionation column provided with a contacting section arranged between the upper part and the lower part of the fractionation column; passing a direct side stream at low pressure through the cold side of the external heat exchanger to obtain heated two-phase fluid; introducing the heated two-phase fluid into the lower part of the fractionation column and allowing the vapor to flow upwards through the contacting section; allowing the liquid of the expanded fluid to flow downwards through the contacting section; and withdrawing from the lower part of the fractionation column a liquid product stream having a reduced content of components having low boiling points, and from the upper part of the fractionation column a gas stream which is enriched in components having low boiling points.
    • PCT No.PCT / EP97 / 01000 Sec。 371日期1998年8月5日 102(e)日期1998年8月5日PCT申请日1997年2月27日PCT Pub。 No. WO97 / 32172 PCT Pub。 日期1997年9月4日减少液化天然气中低沸点组分的量的方法包括将液化天然气以液化压力通过外部热交换器的热侧,以获得冷却的液化天然气,使冷却的液化天然气 气体动态膨胀至中间压力,静态膨胀至低压以获得膨胀流体,并将膨胀流体引入分馏塔的上部,所述分馏塔设置有布置在分馏塔的上部和下部之间的接触部分; 使低压直流侧流通过外部热交换器的冷侧以获得加热的两相流体; 将加热的两相流体引入分馏塔的下部并允许蒸汽向上流过接触部分; 使膨胀流体的液体向下流过接触部分; 并从分馏塔下部排出具有低沸点组分含量降低的液体产物流,并从分馏塔上部排出富含低沸点组分的气流。
    • 6. 发明授权
    • LNG로부터의 질소 제거 방법
    • 液化天然气从这里开始
    • KR100399458B1
    • 2003-12-24
    • KR1019960015112
    • 1996-05-08
    • 더 엠. 더블유. 켈로그 컴파니
    • 데이비드알렌코일펠릭스제이.페르난데쯔데라베가찰스아서듀어아슈토쉬라스토기
    • F25J3/06F25J3/02
    • F25J3/0233F25J3/0209F25J3/0257F25J3/029F25J2200/80F25J2215/04F25J2235/60F25J2240/40
    • A nitrogen removal process for a natural gas liquefaction plant removes nitrogen from a relatively warm high pressure liq. stream contg. at least 80 mole% methane and up to 20 mole% nitrogen. The process comprises: (a) cooling the liq. stream in an enhanced surface heat exchanger against relatively low pressure liquefied natural gas (LNG) stream to form a relatively cool high pressure liq. stream and partially vaporise the low pressure LNG stream, (b) expanding the relatively cool high pressure liq. stream from (a) to form further cooled mixt. of liq. and vapour, (c) feeding the mixt. from (b) to a separator to form a liq. stream and a vapour stream, (d) supplying the liq. stream from (c) to the heat exchanger in (a) as the relatively low pressure stream which is partially vaporised to form a fluid of enhanced nitrogen content and a liq. prod. stream lean in nitrogen, (e) countercurrently contacting the low pressure LNG stream in the heat exchanger with the fluid vaporised in the heat exchanger to strip nitrogen, (f) supplying the fluid vaporised in the heat exchanger to the separator in (c) and (g) recovering the vapour stream from the separator, the vapour stream being enriched in nitrogen content.
    • 天然气液化装置的除氮过程从相对温暖的高压液体中除去氮气。 溪流contg。 至少80摩尔%的甲烷和至多20摩尔%的氮。 该过程包括:(a)冷却液体。 在增强的表面热交换器中对抗相对低压的液化天然气(LNG)物流流动以形成相对较冷的高压液体。 使低压LNG流部分汽化,(b)使相对较冷的高压液体膨胀。 从(a)流出以形成进一步冷却的混合物。 liq。 和蒸汽,(c)进料混合物。 从(b)到分离器形成液体。 流和蒸气流,(d)供应液体。 从(c)到(a)中的热交换器作为部分汽化形成氮含量增加液和液体的较低压力流。 刺。 (e)使热交换器中的低压LNG流与热交换器中汽化的流体逆流接触以汽提氮气,(f)将在热交换器中蒸发的流体供给(c)中的分离器,以及 (g)从分离器中回收蒸气流,蒸气流富含氮气。