Single-stage, multi-stage and variable-stage cyclone air flotation oily sewage treatment device

Abstract

Single-stage, multi-stage and variable-stage cyclone air flotation oily sewage treatment devices, including the external shell composed of cylindrical cylinders and upper and lower heads; overflow pipes, return pipes, and underflow pipes at all levels 1. The inlet and outlet pipeline part composed of central standpipe; the internal structure composed of water distribution pipes at all levels, deflectors at all levels, annular channel and treated water collection plate. The primary overflow pipe is located on the top of the upper head, and the other overflow pipes are located on the upper side of the shells at all levels; the bottom flow pipe is located at the lower head; the return pipes of all levels pass through the shells of all levels and communicate with the annular passages of all levels; the central standpipe It is located on the axis of the cylinder and passes through the lower head, the annular passage and the cylinders at all levels; the first-level water distribution pipe is located at the top of the central riser, and the others are located at the bottom of the annular passage; the deflectors at all levels are spirally inclined and fixed in the cylinders at all levels Wall; treatment water collection plate is located between the two cylinders. The invention has the advantages of compact structure, simple operation, single multi-stage design to meet the requirements of different effluent water quality and treatment capacity, wide applicability and good oil removal effect.

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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