Flow analysis and structure optimization of micro-bubble swirling air flotation device
Based on the Euler-Euler multiphase flow model,the oil-water separation multiphase flow process in a micro-bubble swirling air flotation device was numerically calculated.In the actual production process,the oil droplet in the device will collide with the injected swirling gas and adhere to form an oil drop-bubble adhesive.Therefore,the three-phase flow process of oil-gas-water in the micro-bubble swirling gas flotation device was simplified into a two-phase flow process of oil-gas mixed phase and water phase.The mixed phase density of oil and gas was determined by comparing the actual separation efficiency with the calculated results.Then,through the analysis of the calculation results,the influence law of the width and inclination angle of the diversion tube on the swirl strength and separation efficiency of the micro-bubble swirl air flotation device was obtained.The numerical calculations results show that the separation efficiency and the oil content of the outlet of the device increase first and then decrease with the increase of the width of the diversion pipe,and the separation efficiency of the device reached the best when the diversion pipe width was around 53 mm.The separation efficiency of the device and the oil concentration at the top outlet first increase and then decrease with the increase of the diversion tube inclination angle.The separation efficiency of the device reaches the optimum when the diversion pipes inclination angle was around 9°.
swirling air flotationseparation efficiencydiversion structurenumerical simulationmicro-bubbles
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