Oil-containing sewage floatation cyclone coupling separation method

Abstract

The invention discloses a flotation swirl coupling and separation method for oily sewage, which utilizes the special stirring function of the vortex pump to make the vortex pump absorb water (oily sewage) while sucking air, stir and mix the sewage and gas, and pressurize to ≥ 0.20MPa, and then pumped into the deoiling cyclone with a special structure. Due to the sudden drop in pressure, a large number of fine air bubbles are released quickly. In the centrifugal force field of the swirl, the air bubbles and tiny oil droplets automatically adhere to the Together; since the density of oil droplets and air bubble adherents is much lower than that of the oil phase, this increases the density difference between the oil phase and the water phase, which makes it impossible to use ordinary deoiling cyclones. The separated tiny oil droplets can be separated by a flotation cyclone combination device, and the purification rate can reach more than 99%. The method of the invention can be widely applied to the liquid / liquid separation of oily sewage, saturated water with oil and other heterogeneous systems in the fields of oil refining and chemical industry.

Description

technical field [0001] The invention relates to an oil-water separation method, in particular to a separation method suitable for sewage containing tiny oil droplets. Background technique [0002] At present, both cyclone and air flotation are effective unit methods for oil-water separation. The known cyclone oil removal method is to use the density difference between the oil and water phases to separate the oil and water by the centrifugal force generated by the cyclone. The cyclone separation technology is fast and efficient, but it is suitable for oil content greater than 0.1%. However, the separation effect on the system with oil content <0.1% in tiny oil droplets is not great; the air flotation method is to inject gas into the water to form a large number of tiny bubbles in the water, and rely on the surface tension characteristics of the tiny bubbles to make The oil droplets automatically attach to the air bubbles to increase the density...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects that the traditional cyclone cannot effectively separate tiny oil droplets of sewage and the traditional air flotation technology has a slow separation speed, the present invention develops an air flotation swirl coupling separation technology, which takes advantage of the respective advantages of air flotation and swirl technology, and can Separation of tiny oil droplets can achieve the purpose of fast and efficient

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