Three-stage pressure-reducing V-shaped hydraulic cyclone air floatation device

Abstract

The invention provides a three-stage pressure-reducing V-shaped hydraulic cyclone air floatation device which is applied to efficient treatment of oil-containing sewage and industrial wastewater. Gas-liquid phase current tangentially enters a three-stage cyclone to form rotary motion, oil, gas and water are separated in a centrifugal force field, water is thrown into a water collecting barrel, meanwhile the pressure is reduced gradually and momentarily by virtue of a three-stage cyclone cone and guide vanes, and sump oil is attached to micro-bubbles and is brought into an oil collecting pipe, so that efficient purification treatment of production water is realized; the treatment capacity can be adjusted by changing the axial distances among different stages of cyclones, so that the device is wide in application range; a back flushing cleaning liquid is used for flushing a tank body comprehensively by virtue of a flushing pipe, so that a component self-flushing function is realized; liquid-carrying air current is turned into clean gas by means of triple separation of a liquid collector, a rectifier and a screen liquid filter, so that a gas self-cleaning function is realized; a pressure safety valve, a liquid-level-difference transmitter and a liquid level control valve are arranged, so that the automatic degree of the device is increased; the entire set of device is compact in structure, and easy to install, operate and maintain.

Description

Technical field [0001] The invention relates to a hydrocyclone air flotation device used in an oily sewage and industrial wastewater high-efficiency treatment system, in particular to a high-efficiency deoiling and purifying device for produced water integrated with cyclone and air flotation on an offshore platform. Background technique [0002] As the development depth of onshore and offshore oil and gas fields increases, the water content of the oil produced by the oilfields is also gradually increasing, especially for the oil and gas fields entering the high water cut period and tertiary oil recovery period, making the average water content in the produced oil reach more than 90% At the same time, the difficulty of treating oily sewage has increased accordingly. [0003] At present, pressurized dissolved air flotation, induced air flotation and compact air flotation are widely used in oily sewage and industrial wastewater treatment systems. The multiphase dissolved air pump air...

AI Technical Summary

Problems solved by technology

The multiphase dissolved air pump air flotation system completes the process of water pressurization, gas suction and dissolution shearing in a multiphase dissolved air pump. The configuration of the system is simple, and the operation and maintenance are easy, but its power consumption and the cost of the pump itself cannot be ignored , and the multiphase soluble air pump has a strong shear emulsification effect on raw water, which will cause a significant reduction in purification efficiency

Hydro-induced air flotation, that is, jet air flotation, this technology has low power consumption, and at the same time, there are no rotating parts in the jet or high-speed Venturi tube, and the shear force is small, which will not cause the adherends to break up. However, the micro The particle size of the bubbles is large, and its efficiency is greatly affected by the outlet aperture of the ejector or high-speed Venturi tube. The requirements for water quality and pressure entering the nozzle are relatively strict, and small fluctuations may have a greater impact on the purification efficiency.

Compact air flotation is the integration of air flotation and cyclone separation technology to process oil well output on offshore platforms to save space and reduce load, such as CrudeSep of CETCO in the United States, compact air flotation CFU of Epcon in Norway, Germany Siemens' VorSep, etc., however, is still in its infancy in China

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