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In order to analyze the strain distribution of the bowl body in disc separator, a finite element analysis (FEA) simulation model of the bowl was established by using ANSYS finite element analysis technology. The threaded connection of the lock ring and the bowl fittings were in effect on the strain distribution and the size of the bowl body. Therefore, simulation analysis was carried on and the influence of thin and thick disc group on the strain and displacement field of the bowl body was discussed. By means of optical non-contacting measurement instrument digital image correlation (DIC), the displacement field distribution of the bowl body outside the round wall was measured. The results show that the displacement field distribution stimulation results of the bowl body of the disc separator is similar to that of the measured results. The maximum strain load is located near the inner side of the disc frame at the bottom of the bowl body. According to the measured data, the modeling method of finite element analysis model needs the further improvement and optimization. [ABSTRACT FROM AUTHOR]

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Wastewater treatment and recycling for offshore oilfield can bring economic and social benefits. This paper produced wastewater treatment and recycling technological process for offshore oilfield combining with engineering practice. Considering the complexity of internal flow in disc separator, VOF model and RNG k-ε turbulence model were used to numerically simulate the process of separating oil-water in the separator then the law of distribution and the efficiency of separating oil-water such as flow velocity, pressure, turbulent kinetic energy, turbulent flow, laminar flow and so on were obtained. The discrete phase model (DPM) was used to simulate the motion of particles, then obtained the motion process and separation efficiency of discrete phase particles. The test results show that, the separation efficiency of the calculation and actual measurements both meet the design requirements with the separation efficiency calculated slightly higher than that in the actual measurements. The relative error of oil-water separation efficiency and particle separation efficiency are 1.5% and 1.4% respectively. The data indicate that the numerical simulation method is reliable for predicting the separation performance of the separator, so wastewater treatment and recycling technological process meet the requirements of engineering application. [ABSTRACT FROM AUTHOR]

Latex separator is the key part of latex concentrated processing equipment, and belongs to disc separator. Disc separator is widely used in various industrial sectors. At present, the theory research on flow field and structure of separator drum is still not perfect, which results in the lack of theoretical guidance for the optimization of flow field and structure about the drum. To solve this problem and to reveal the latex fluid dynamics characteristics of the drum, the research on the flow field of latex drum was carried out. A mathematical model for the flow field of centrifugal separation was established. Based on FLUENT and two-phase flow model built, the fluid dynamics characteristics were explored through simulation and theoretical analysis. In the simulation of latex separation process, the separation effects under different speeds and different rubber particle sizes were conducted. The test of model validation was carried out in the branch factory affiliated to Guangdong Agricultural Reclamation Rubber Group in Zhanjiang in July 2016. The testing separator was the LX-460 type latex separator whose drum parameters were the basis of the construction of analysis model. The measured dry rubber content as comprehensive characteristic parameter was used to validate the model. Based on the mechanics theory, the factors affecting the separation speed of light and heavy phases, the flow state and fluid flow trajectory within the disc gap, the concentration limit and other aspects were analyzed and discussed. For the parameter setting of the model, the kinematic viscosity of concentrated latex was 0.03848 mPa·s, the surface tension coefficient was 0.034 N/m, the rubber particle size was 5 μm, the dry rubber volume fraction of raw latex was 0.33, the latex temperature was 26°C, the disc clearance was 0.5 mm, and the properties of latex skim were set as that of water in material library. The research results showed that: At 7 250 r/min rotation speed of the drum, the dynamic process of latex separation was clearly displayed. The rubber particles showed a tendency of separating from latex skim 10 seconds after fresh latex entered the drum. The dry rubber volume fraction of concentrated latex at light phase outlet completely reached the maximum stable value 120 seconds after latex entered the drum. When the rotational speed was respectively 6 750, 6 750 and 7 250 r/min, the simulated dry rubber volume fraction of concentrated latex was 0.587 5, 0.612 6, 0.635 8 respectively at light phase outlet. The higher the speed, the larger the volume fraction of concentrated latex. But when the speed exceeded 7 250 r/min, the increase in the volume fraction of dry latex grew slow, and the fluid pressure and structural stress would increase obviously. When the latex particle sizes were respectively 1, 2, 3, 4 and 5 μm, the simulated values of dry rubber volume fraction at light phase outlet were 0.354, 0.392, 0.447, 0.531 and 0.609 at the 7 250 r/min speed. The dry rubber volume fraction of concentrated latex increased with the increase of the particle size. The dry rubber volume fraction at light phase outlet had a little fluctuation caused by a vortex. The simulation result was in agreement with the experimental result of concentrated latex. The relative error was 3.83%. The reliability of the analytical model was verified. In addition, the theoretical analysis results showed that the factors that significantly affected the separation speed between light and heavy phases were particle size, rotating speed and turning radius of particles. The trajectory of light and heavy phases between the discs would deviate from the conical disc busbar because of the the Coriolis force effect. With the increase of dry rubber content in the process of centrifugal concentration, the viscosity and the particle resistance increased gradually, the turning radius decreased gradually, and there existed the upper bound for latex concentration. The drum structure would be a reasonable design with shorter light-phase discharging path and longer heavy-phase discharging path. The minimum particle size of 0.05 μm would be obtained from the neutral hole by theoretical calculation. The centrifugal removal of tiny impurities was superior. The results provide more theoretical guidance and reference for revealing the mechanism of latex centrifugal concentration, and optimizing separation process and drum structure. [ABSTRACT FROM AUTHOR]