Ducted two-stage flow deflector type oil-water separator and its application method

The invention discloses a ducted two-stage flow deflector type oil-water separator and its application method. The ducted two-stage flow deflector type oil-water separator comprises a primary liquid inlet tube section, an increasing tube section, a primary rotational flow generation tube section, a primary water removal tube section and a secondary rotational flow separation tube section; each of the primary rotational flow generation tube section and the secondary rotational flow separation tube section comprises more than two flow deflectors fixedly and obliquely arranged thereon; and each of the primary water removal tube section and the secondary rotational flow separation tube section is provided with more than one group of water removal apertures. The separator can realize fast and efficient oil-water separation in a limit space, and has a good industrial application prospect.