Process for removing nitrogen from LNG
    6.
    发明授权
    Process for removing nitrogen from LNG 失效
    从LNG中除氮的工艺

    公开(公告)号:US5505049A

    公开(公告)日:1996-04-09

    申请号:US437623

    申请日:1995-05-09

    IPC分类号: C10L3/10 F25J3/02 F25J3/00

    摘要: A process for removing nitrogen from liquefied natural gas (LNG) using an enhanced surface, reflux heat exchanger is disclosed. A relatively warm high pressure LNG stream is directed countercurrently in heat exchange with a cool low pressure LNG stream to chill the high pressure stream and partially vaporize the low pressure LNG stream in the reflux heat exchanger. Vapor produced thereby strips the low pressure LNG stream of nitrogen. The cool low pressure LNG stream is produced by expansion of the chilled high pressure LNG stream. Vapor produced by the expansion is combined with the vapor produced in the exchanger and withdrawn overhead. Product LNG which is lean in nitrogen is withdrawn from the bottom of the exchanger.

    摘要翻译: 公开了一种使用增强型表面回流热交换器从液化天然气(LNG)中除去氮气的方法。 相对温暖的高压LNG流与冷的低压LNG流逆流导向,以冷却高压流并部分蒸发回流热交换器中的低压LNG流。 产生的蒸汽由此剥离低压LNG的氮气流。 冷却的低压LNG流是通过冷却的高压LNG流的膨胀产生的。 通过膨胀产生的蒸气与在交换器中产生的蒸汽结合,并在塔顶馏出。 贫氮的产物LNG从交换器的底部排出。