| With the increasing level of urbanization and the rapid development of the catering industry,coupled with the implementation of relevant policies on the treatment of oily wastewater in catering,the discharge of oily wastewater has significantly increased.Due to the presence of a large number of pollutants in oily wastewater in catering,improper treatment will cause serious pollution to natural water bodies such as rivers and lakes.Therefore,studying the oil-water separation equipment for catering is of great significance in protecting the environment.This article first designs a catering oil-water separation equipment based on the basic principles of centrifugal separation technology and the characteristics of catering oily wastewater;Secondly,study the impact of different separation structures and process parameters on separation efficiency,and make experimental prototypes to verify the results of simulation calculations;Finally,the internal flow field of the oil-water separation device was studied and the influence of different process parameters on the internal flow field was discussed.The main content of this article is as follows:(1)Based on the principle of centrifugal separation technology and the characteristics of oily wastewater in restaurants,the entire oil-water separation equipment is designed,including the calculation of the power of the shaftless spiral blades and spiral transmission in the solid-liquid separation device,as well as the design and calculation of the rotating drum,straight plate rotating grid,and support seat in the oil-water separation device.The model is modeled using SOLIDWORKS 3D software.(2)The ANSYSFLUENT software was used to study the influence of different process parameters on the oil-water separation efficiency under the condition of straight plate rotating grating with different blade numbers.The response surface analysis was used to obtain the optimal process parameter combination and separation efficiency.The relative error between the predicted separation efficiency and the optimal process conditions was about 3% through simulation calculation.An experimental prototype was made to verify the separation performance of the oil-water separation equipment.The relative error is about 10.2% compared with the separation efficiency calculated by simulation.From the separation effect,this experiment can show that the design of oil-water separation device in this paper is reasonable,and through simulation calculation,save the cost of other structural experiments.(3)On the basis of the previous studies,in order to deeply understand the oil-water separation mechanism and the influence principle of process parameters on the oil-water separation performance,the internal flow field of the separation device was studied,and the influence of different process parameters on the internal flow field of the oil-water separation device was analyzed.In particular,it includes the influence on the velocity field,pressure field and oil phase volume fraction distribution when the feed flow and rotation velocity are different.The results show that when the feed flow rate increases gradually,the axial velocity increases with the increase,especially at the axial center.With the increase of feed flow rate,tangential velocity will increase slightly and centrifugal force will be increased.At the same time,the concentration of oil phase at the axis also increases with the increase of the feed flow rate,but then gradually decreases.The static pressure in the device will also increase with the increase of feed flow,but eccentric phenomenon will appear,affecting the stability of the oil core.The rotation velocity has the greatest influence on the tangential velocity inside the oil-water separation device,and has a greater influence on the oil phase accumulation at the rotor center.Compared with the feed flow rate,the rotation velocity has little influence on the axial velocity and static pressure distribution. |
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