Abstract: The present disclosure provides a concentric sloping plate enhanced vertical compact flotation unit, relates to the technical field of oily waste water treatment, and is mainly used for efficient treatment of oily waste water such as oilfield produced water, refining and chemical waste water and tanker ballast water. The compact flotation unit includes a tank, an oil receiving structure, a swirling inner cylinder, a swirl breaking structure, a flow equalizing structure, sloping plate sedimentation components and a center cylinder. An exhaust port is formed in the top of the tank, a slag discharge port is formed in the bottom of the tank, and the side surface of the tank is provided with an oil spill port, a water outlet pipe and a water inlet pipe.

Abstract: The present disclosure provides a vertical compact flotation unit with air stripping enhanced shallow sedimentation effect of spiral fins, and relates to the technical field of complicated treatment of oily waste water such as oil field polymer flooding produced water so as to give consideration to bubble utilization rate, operation energy consumption, structure compactness and installation and maintenance cost. The equipment includes a tank, an oil receiving structure, a swirling inner cylinder, a swirl breaking structure, sedimentation separation components and a center cylinder. An exhaust port is formed in the top of the tank, a slag discharge port is formed in the bottom of the tank, the side surface of the tank is provided with an oil spill port, a water outlet pipe and a water inlet pipe, and the water inlet pipe is tangentially connected with the swirling inner cylinder.

Abstract: A circuit includes a boost circuit, a first circuit coupled to the boost circuit and a second circuit coupled to the boost circuit. The boost circuit, the first circuit, and the second circuit form an open loop. The first circuit and the second circuit maintain a switching frequency of the boost circuit above a threshold frequency.