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Oil and water resources of the national economy and people's lives can not be replaced, along with the development of the national economy, the global energy crisis is intensifying, and the increasingly serious environmental pollution, oil and water mixture separation problem received wide attention. Cyclone centrifugal separation method due to centrifugal force field strength is much greater than the strength of the gravitational field, the high rate of separation and efficiency, the devices are small, simple structure, while avoiding secondary pollution of the chemical treatment of water and oil resources in all walks of life showed increasingly broad application prospects. But the law is mainly used in the water off the oil, and oil, in addition to the water at the initial stage. In view of this situation, the diesel - water as the test substance Department has been studied from both the experimental and numerical simulation of the centrifugal force field of liquid - liquid two-phase transfer process, especially oil dehydration. The main contents as follows: (1) Experimental study of the composition of the two-phase mixture was viscosity and phase state, and determine the moisture content of 33% when the phase inversion point, corresponding to the mixture viscosity. In the range of less than 33% moisture content, the oil is the continuous phase, water as the dispersed phase, with increasing water content in the oil, the viscosity of the mixture also increases. In the range of moisture content greater than 33% of the water as the continuous phase and the dispersed phase drop oil, the viscosity of the mixture with the water content increases. (2) through orthogonal experiment, the centrifugal separator structure parameter optimization, to determine the best structure parameters: the overflow hole diameter 2mm, underflow port diameter 3.5mm, overflow pipe length 22mm. (3) The experimental study of the main operating conditions of the separation performance of optimal structural parameters, the volume of water in the raw material concentration of 8.832%, and diversion ratio of 0.75, the inlet flow rate of 550 l / h to 700 L / h range, a high separation efficiency is about 85%. (4) for the first time to explore the components of the liquid - liquid cyclone separation cyclone, a significant effect when the plus solid rod separation efficiency can reach about 90%, and the raw water concentration from 8.3% less than 1%. (5) the quality of the liquid-liquid two-phase transfer process and momentum transfer process theory, the use of CFD-Fluent software, reasonable choice of the mathematical model and the correct setting boundary conditions, combined with a rotating flow in fluid dynamics, a combination of vortex theory, and theoretical and experimental results of the cyclone, the numerical simulation of the internal flow field of oil under the experimental conditions, in addition to the water-cyclone. On the basis of the simulation results, test results and theoretical analysis, the optimization of the experimental equipment.
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