Dissolved air flotation tank

Abstract

A dissolved air flotation tank comprises a tank body, an upper head, a lower head, a pack mounting rack and a conical barrel, wherein coalescent pack and a taper tube are arranged on the pack mounting rack, a blowdown pipe is arranged on the lower side of the taper tube, an outer barrel is arranged on the upper side of the taper tube, an inner barrel is arranged in the outer barrel, a cyclone water inlet pipe is welded tangentially on the side wall of the inner barrel, an insertion pipe is inserted in the cyclone water inlet pipe and connected with a static mixer and a water inlet, a dross outlet is formed in the upper head of the tank body, and the blowdown pipe is arranged on the lower head of the tank body; a closed water purification area is formed between the conical barrel and the lower head, a plurality of water distribution square tubes communicating the tank body with the water purification area are arranged uniformly on the lower surface of the conical barrel; the water purification area is provided with a water outlet in the side wall of the tank body. An air flotation technology, a cyclone separation technology and a coalescence-separation technology are combined, and the dissolved air flotation tank further has the advantages of occupying small area and being low in cost, high in oil removal efficiency, simple and convenient to operate and high in reliability.

Description

technical field [0001] The invention relates to the field of oily sewage treatment in oil fields, in particular to a dissolved air flotation tank. Background technique [0002] A large amount of waste water containing oil and suspended solids is produced in the production process of oil extraction, treatment, crude oil refining and so on. At present, the pressurized dissolved air flotation device is one of the most commonly used equipment. The dissolved air system of the pressurized dissolved air flotation device is composed of an air compressor, an air storage tank and a releaser. Due to structural and design problems, there are usually problems such as large footprint, uneven air bubbles, unstable air bubble release pressure, low efficiency in removing oil and suspended matter, and complex equipment structure. Contents of the invention [0003] The object of the present invention is to provide a new type of dissolved air flotation tank, which combines air flotation tec...

AI Technical Summary

Problems solved by technology

Due to structural and design problems, there are usually problems such as large footprint, uneven air bubbles, unstable air bubble release pressure, low efficiency of oil removal and suspended matter removal, and complex equipment structure.

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