Single-stage, multi-stage and variable-stage rotational flow air floatation oil-containing sewage treatment device

Abstract

The invention discloses a single-stage, multi-stage and variable-stage rotational flow air floatation oil-containing sewage treatment device, which comprises an outer shell comprising all stages of cylinder bodies, an upper seal head and a lower seal head, an inlet and outlet pipeline part comprising all stages of overflow pipes, all stages of reflux pipes, an underflow pipe and a central verticalpipe, and an internal structure comprising all stages of water distribution pipes, all stages of flow guide plates, annular channels and treated water collecting plates, wherein the first-stage overflow pipe is positioned at the top of the upper seal head, other overflow pipes are positioned on the upper side surfaces of various stages of the cylinder bodies, the underflow pipe is positioned at the lower seal head, various stages of the reflux pipes penetrate through various stages of the cylinder bodies and are communicated with various stages of the annular channels, the central vertical pipe is located on the axis of the cylinder bodies and penetrates through the lower seal head, the annular channels and various stages of the cylinder bodies, the first-stage water distribution pipe ispositioned at the top of the central vertical pipe, other water distribution pipes are positioned at the bottoms of the annular channels, various stages of the flow guide plates spirally incline upwards and are fixed on the inner walls of various stages of the cylinder bodies, and the treated water collecting plate is positioned between the two cylinder bodies. The device of the invention is compact in structure, easy and convenient to operate, wide in applicability and good in oil removal effect, wherein the single-body multi-stage design meets the requirements of different effluent qualitiesand treatment capacities.

Description

technical field [0001] The invention relates to a single-stage, multi-stage and variable-stage cyclone air flotation oily sewage treatment device. The device couples the traditional cyclone separation technology with the air flotation technology, and is suitable for simple process requirements and limited space and site , Oily sewage treatment occasions with high requirements for drainage water quality, belonging to the technical field of multiphase separation of oil and gas gathering and transportation systems. Background technique [0002] In the late stage of oilfield development, the water content of the produced fluid continues to rise, and the amount of oily sewage treatment increases greatly; in the tertiary oil recovery, the polymer flooding produced fluid is seriously emulsified and difficult to purify; Limited, strict requirements on equipment processing efficiency and floor space. [0003] At present, the commonly used sewage treatment technologies are as follows...

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Problems solved by technology

[0004] Chinese invention patent CN109052558A discloses a cyclone air flotation separation device, which combines the filtration process and adds filter material at the bottom of the separator, which can effectively reduce the oil concentration at the water outlet. However, due to the lack of backwashing process, the equipment needs to be stopped for a certain period of time. It is difficult to meet the requirements of long-term stable operation on site; Chinese invention patent CN106587243A discloses a cyclone-air-flotation integrated device, which performs a cyclone separation and two air-flotation separations on the sewage, and the separation effect is better. However, the structure of the equipment is complicated, there is a gas phase space on the top of the separator, and the liquid surface is easy to shake, which is not suitable for offshore platforms; Chinese invention patent CN106865673A discloses a secondary cyclone air flotation oily sewage treatment device, which weakens the cyclone intensity by increasing the inner cylinder Attenuation, but because it is a single inlet, the flow field distribution in the separator is uneven, and it is difficult to achieve high-efficiency separation; Chinese invention patent CN103303992A discloses a cyclone air flotation separation device for oily sewage. Although the device has two-stage separation, the two-stage device Simple series connection, without integrated prying, it is difficult to meet the requirements of compactness and high efficiency

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