To prevent adhesion of oil to a reliquefying line while securing sealing performance of a compression device for compressing boil-off gas.SOLUTION: A compression device 10 comprises an oilless type front stage compressor 21 for sucking and compressing boil-off gas, a rear stage compressor 23 for compressing the boil-off gas compressed by the front stage compressor 21, and a reliquefying line 29 for reliquefying at least a portion of the boil-off gas compressed by the rear stage compressor 23. The rear stage compressor 23 comprises a plurality of stages of compression mechanisms 23a-23d. A rod lubrication compression mechanism 31 constituted by a reciprocating type compression mechanism and in which oil is supplied between a piston rod and rod packing is included in the plurality of stages of compression mechanisms 23a-23d.SELECTED DRAWING: Figure 1
【課題】ボイルオフガスを圧縮する圧縮装置のシール性を確保しつつ、再液化ラインへの油の付着を防止する。【解決手段】圧縮装置10は、ボイルオフガスを吸引して圧縮する無給油式の前段圧縮機21と、前段圧縮機21で圧縮されたボイルオフガスを圧縮する後段圧縮機23と、後段圧縮機23で圧縮されたボイルオフガスの少なくとも一部を再液化する再液化ライン29と、を備える。後段圧縮機23は、複数段の圧縮機構23a〜23dを有し、複数段の圧縮機構23a〜23dには、往復動式の圧縮機構によって構成され且つピストンロッドとロッドパッキンとの間に給油されるロッド潤滑圧縮機構31が含まれている。【選択図】図1
COMPRESSION DEVICE
圧縮装置
2019-02-21
Patent
Electronic Resource
Japanese
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