Multiphase separation method and system for processing oily waste water

Abstract

The invention discloses a multiphase separation method and a system for processing oily waste water. The multiphase separation system comprises a cyclone-air flotation integrated separator, a multiphase pump for mixing gas with liquid arranged at an oily waste water inlet, a multiphase pump for mixing pure water for circulation and backflow with circulation gas and the like. The oily waste water enters from the bottom of a tank body into a cyclone to perform a hydrocyclone separation, tiny bubbles in the waste water are released to perform a first air floatation, light substances such as bubbles with oil particles are moved to the top of the cone-shape cyclone, heavy substances such as solid particles are moved to the bottom of the cone-shape cyclone, the waste water runs over the top of the cone-shape cyclone to enter a secondary air floatation zone, the pure water for circulation and backflow and circulation gas are shear mixed in the multiphase pump, then the oily waste water is subject to a secondary air floatation by using gas-liquid mixture from water distributing apertures on an annular water-locator, and the waste water is subject to a hydrocyclone separation and two air floatation separations in a separator. The invention has the advantages of simple and compact structure, high work efficiency, and is used for the purifying process of oily waste water containing tiny dispersed oil particles.

Description

technical field [0001] The invention relates to a method and equipment for separating multiphase mixed media such as oil, gas, water, solid suspended matter and even sand grains, and is especially suitable for purifying and treating oily wastewater containing tiny dispersed oil particles. Background technique [0002] Oily wastewater is often encountered in petroleum and petrochemical industries, machinery manufacturing, and urban life, and the removal of oil is often the primary treatment task. There are many methods for oil-water separation. The commonly used methods include gravity sedimentation, centrifugal sedimentation, air flotation, coagulation filtration, adsorption, membrane separation, etc. Each treatment method has its own advantages and disadvantages and specific scope of application. Among them, the air flotation method has mature technology, low cost and large treatment capacity, and can effectively remove emulsified oil and partially soluble pollutant compone...

AI Technical Summary

Problems solved by technology

[0010] According to the background technology, the purpose of the present invention is to overcome the shortcomings of traditional hydrocyclones that are difficult to effectively separate tiny oil particles and traditional air flotation equipment, such as large footprint, long residence time, and complex structure, and propose a method that makes full use of turbulent flow. The theory of air flotation organically combines the two oil-water separation unit technologies of cyclone and air flotation, so that the dispersed oil particles in the water can be separated efficiently, the equipment is compact in structure, and the new cyclone gas that meets the preliminary separation treatment and even direct discharge standards is applied in the oil field. Floating integrated multiphase separation method and system

Images