Flow Field Analysis And Mixing Performance Study During Side Wall Mixing

The mixing technology is used in the homogeneous mixing of heavy oil,gasoline and other petroleum products,as well as some flammable new energy tanks.Due to its low energy consumption and special installation location,its sidewall stirring technology can be widely used in some large cylindrical tanks and situations that cannot be met by top-entry agitators.In the process industry,the stirring reaction equipment makes the materials fully mixed and uniformly mixed.The chemical industry needs the stirring of a stirrer to mix the reaction medium and act as a physical catalyst.In the production operation,factors such as the characteristics of the mixing medium,the structure of the equipment,and the operating conditions are closely related to the mixing effect of the flow field,and the mixing effect inside the flow field also determines the operational performance of the agitator.Therefore,studying the flow field and fluid flow characteristics of the side wall stirred reactor is of great significance to the optimization of the reactor structure design and energy saving.In the process industry,the stirring reaction equipment makes the materials fully mixed and uniformly mixed.Take the large-scale side wall stirred cylindrical tank as the research object.A systematic study on the flow field of a sidewall stirred reactor under a single agitator and multiple joint operations has been carried out.A dynamic simulation of the internal flow field of a large cylindrical tank is carried out,and the internal flow field law is analyzed.Cooperate with a cooperative enterprise to build a large-scale cylindrical tank side wall stirring test bench with a diameter of φ=6000mm,and measure the three-dimensional velocity and pressure distribution of the flow field at different positions under different operating conditions.The experimental and simulated data are compared with each other to provide a basis for the parameter design of the large-scale sidewall agitator.The relevant research content and conclusions are as follows:(1)Analysis of the theoretical basis of the fluid simulation of the side wall stirred cylindrical tank.Compare the optimized model of the experimental platform,and study the CFD numerical simulation method,determine the model required for the calculation,and lay the foundation for the subsequent numerical simulation of the large-scale sidewall stirred tank.(2)Use Soildworks to perform 3D modeling of the side wall stirred cylindrical tank,ICEM grid division,and Ansys Fluent to perform numerical simulation and calculation.And study the influence of different speed,installation height,installation inclination angle and the number of agitators on the three-dimensional flow field of the large cylindrical tank side wall agitator of φ6000.The simulation results show that the flow field in the stirred cylindrical tank with a single paddle is stratified,which is two circulating flows with opposite flow fields.The existence of the horizontal deflection angle and the vertical deflection angle increases the average velocity of the flow field in the entire cylindrical tank and the disturbance degree of the internal flow field,and strengthens the mixing effect in the tank.When the horizontal deflection angle is,the vertical deflection angle is,the flow field inside the single-phase tank is the best,and the mixing performance is the best.When the height of the liquid level in the mixing cylinder tank is 5m,the installation height of about3 m obviously increases the flow field disturbance,and the mixing effect is best at this time.When the number of stirrers N=5,the mixing performance of the flow field inside the stirring cylinder is the best.(3)Combining the dynamic changes of the average velocity v of the flow field in the tank with the turbulent kinetic energy K under different parameters,observe the mixing effect of the internal fluid,and establish an evaluation method to measure the mixing effect in the flow field.(4)The instantaneous dynamic pressure and velocity of the flow field points in the large tank are measured experimentally,and the results of the numerical simulation are compared.Finally,the optimal parameters of the large-scale sidewall stirred tank are obtained through data analysis.