METHOD OF COOLING BOIL OFF GAS AND AN APPARATUS THEREFOR
    36.
    发明公开
    METHOD OF COOLING BOIL OFF GAS AND AN APPARATUS THEREFOR 审中-公开
    冷却锅炉关闭气体的方法及其装置

    公开(公告)号:EP3183489A1

    公开(公告)日:2017-06-28

    申请号:EP15756225.7

    申请日:2015-08-21

    发明人: HALCROW, Martin

    摘要: A method of cooling a boil off gas stream from a liquefied ethane cargo in a floating transportation vessel, said method comprising at least the steps of: compressing a boil off gas stream from said liquefied ethane cargo in two or more stages of compression comprising at least a first stage and a final stage to provide a compressed BOG discharge stream, wherein said first stage of compression has a first stage discharge pressure and said final stage of compression has a final stage suction pressure and one or more intermediate, optionally cooled, compressed BOG streams are provided between consecutive stages of compression; cooling the compressed BOG discharge stream against one or more first coolant streams to provide a first cooled compressed BOG stream; cooling the first cooled compressed BOG stream against at least one second coolant stream to provide a second cooled compressed BOG stream; cooling the second cooled compressed BOG stream against a third coolant stream to provide a third cooled compressed BOG stream; expanding a portion of the third cooled compressed BOG stream to a pressure between that of the first stage discharge pressure and the final stage suction pressure to provide a first expanded cooled BOG stream; using the first expanded cooled BOG stream as the third coolant stream to provide a first expanded heated BOG stream; and using the first expanded heated BOG stream as the or a second coolant stream.

    摘要翻译: 一种在浮动运输船中冷却来自液化乙烷货物的蒸发气流的方法,所述方法至少包括以下步骤:在两个或更多个压缩级中压缩来自所述液化乙烷货物的蒸发气流,所述压缩包括至少 提供压缩的BOG排放流的第一阶段和最终阶段,其中所述第一压缩阶段具有第一阶段排放压力,并且所述压缩的最终阶段具有最终阶段吸入压力和一个或多个中间的,任选地冷却的压缩BOG 流被提供在连续的压缩阶段之间; 对着一个或多个第一冷却剂流冷却压缩的BOG排放流以提供第一冷却的压缩的BOG流; 使第一冷却压缩BOG流抵靠至少一个第二冷却剂流冷却以提供第二冷却压缩BOG流; 使第二冷却的压缩的BOG流抵靠第三冷却剂流冷却以提供第三冷却的压缩的BOG流; 使第三冷却压缩BOG流的一部分膨胀至第一级排出压力与最终级吸入压力之间的压力以提供第一膨胀冷却BOG流; 使用第一膨胀冷却BOG流作为第三冷却剂流以提供第一膨胀加热BOG流; 并且使用第一膨胀加热的BOG流作为第二冷却剂流或第二冷却剂流。