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    • 58. 发明公开
    • Method and apparatus for the reliquefaction of a vapour
    • Verfahren und Vorrichtung zurRückverflüssigungeines Gasstromes
    • EP1860393A1
    • 2007-11-28
    • EP06352012.6
    • 2006-05-23
    • Cryostar SAS
    • Fuchs, Vincent
    • F25J1/02F17C9/00
    • F25J1/0204F17C2221/033F17C2223/0161F17C2223/033F17C2250/0439F17C2265/03F17C2265/034F17C2265/037F17C2270/0105F25J1/0025F25J1/0045F25J1/005F25J1/0072F25J1/0208F25J1/0277F25J1/0288F25J2205/30F25J2220/62F25J2230/04F25J2230/08F25J2230/60F25J2245/02
    • Vapour boiled off from a liquefied natural gas storage tank (10) is compressed in vapour compression stages (40) and (42). The resulting compressed vapour is condensed in a condenser (46) and the condensate returned to the tank (10). The condenser (46) is cooled by means of a working fluid, for example nitrogen, flowing in a Brayton cycle (60). The Brayton cycle includes a heat exchanger (86) which removes heat of compression from the compressed natural gas vapour upstream of its passage through the condenser (46). In addition a part of the working fluid is withdrawn from a region of the Brayton cycle (60) intermediate the working fluid outlet from the condenser (46) and the working fluid inlet to the heat exchanger (86) and the withdrawn working fluid flows through another heat exchanger (88) in which it removes heat of compression from the natural gas vapour intermediate the compression stage (40) and the compression stage (42). The withdrawn working fluid is returned to the Brayton cycle (60).
    • 从液化天然气储罐(10)中蒸出的蒸汽在蒸汽压缩级(40)和(42)中被压缩。 所得的压缩蒸汽在冷凝器(46)中冷凝,冷凝物返回到罐(10)。 冷凝器(46)通过在布雷顿循环(60)中流动的工作流体例如氮气来冷却。 布雷顿循环包括热交换器(86),该热交换器(86)从其通过冷凝器(46)的通道的压缩天然气蒸气中除去压缩热。 此外,一部分工作流体从位于来自冷凝器(46)的工作流体出口之间的布雷顿循环(60)的区域和到热交换器(86)的工作流体入口的区域中被排出,并且抽出的工作流体流过 另一个热交换器(88),其在压缩级(40)和压缩级(42)之间从天然气蒸汽中除去压缩热。 撤回的工作流体返回到布雷顿循环(60)。