Multistage tower-type flotation device for treating oily sewage

Abstract

The invention relates to a multistage tower-type flotation device for treating oily sewage. The device comprises at least two stages of flotation tower sections which are connected in series up and down, wherein each stage of flotation tower section comprises a barrel, a downflow plate, an oil spill trapping layer, a sump oil overflow sleeve, a tower plate and a diversion pipe; the downflow plateis vertically connected to one side of the inner part of the barrel; the oil spill trapping layer is connected between the other side of the inner part of the barrel and the downflow plate and is positioned in the middle of the barrel; the sump oil overflow sleeve encloses the outer side of the middle part of the barrel, a sump oil discharge pipe is arranged on the bottom end face of the sump oiloverflow sleeve, a notch is formed on the barrel between the top end face of the sump oil overflow sleeve and the oil spill trapping layer; the tower plate is arranged at the bottom of the barrel, and a plurality of micropores are formed on the tower plate; the diversion pipe is communicated between the barrels of the flotation tower sections which are adjacent up and down; a liquid inlet pipe and an exhaust pipe are arranged on the upmost stage of the flotation tower section, and the downmost stage of the flotation tower section is provided with a purified water discharge pipe and an air collecting chamber; and an air inlet pipe is arranged on the air collecting chamber, and valves are respectively arranged on each sump oil discharge pipe and the purified water discharge pipe.

Description

technical field [0001] The invention relates to the field of treatment of oily sewage in oil field exploitation, petrochemical industry, daily life and other industrial productions. Combining the operation process of step-by-step oil discharge, at the same time, it is considered to set up a floating oil trap layer in the upper liquid layer of each stage of the flotation tower to suppress and weaken the liquid level fluctuation, and to trap and coalesce the oil droplets, and the formed A multi-stage tower flotation device for oily sewage treatment. Background technique [0002] With the continuous development of oilfields, the crude oil in the formations has gradually decreased, and most oilfields in my country have entered the secondary or tertiary oil recovery process in the middle and later stages from the primary oil recovery powered by natural energy. Secondary oil recovery requires a large amount of water injection to maintain reservoir pressure, and tertiary oil recov...

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a multi-stage tower flotation device for treating oily sewage, so as to solve the problem of liquid layer fluctuations in conventional flotation cells (columns), oil slick back-mixing and slick oil cannot be timely The problem of low separation efficiency caused by discharge, while overcoming the problem of large footprint of conventional flotation cells

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