The Design And Numerical Simulation Of The Double-suction Turbine Paddle Stirred Tank

Multiphase flow agitators are widely used in petroleum,chemical and other fields.Chemical machinery has a large volume and high production costs,and often wears,breaks and other failure forms during operation.Therefore,it is necessary to perform stress analysis and strength check on the key components of the stirred tank.Traditional gas-liquid-solid multiphase flow agitators mostly adopt ventilation type and surface renewal type,but there is a problem of uneven gas distribution inside.In this paper,a double-suction turbo paddle stirring tank is designed.The structure of the self-priming stirring shaft and stirrer of key components are designed and improved using ANSYS software.The internal flow field is numerically simulated using CFD software and co MPared with the traditional stirring tank.Co MPared.(1)According to the calculation of torsional strength and torsional deformation,a self-priming stirring shaft with a diameter of 100mm and a wall thickness of 14mm was designed.The finite element analysis of the designed stirring shaft showed that the maximum stress at the suction port of the self-priming stirring shaft It is 110.85MPa greater than 105MPa of the stirring shaft material,so the suction port of the stirring shaft is a dangerous section.The reinforcement ring is designed at the suction port,and the optimized self-priming stirring shaft is optimized and analyzed.The results show that the maximum stress at the suction port of the improved self-priming stirring shaft is 56.3MPa,which meets the working strength requirements of the material.(2)For the blade bending angle parametersaandb,whena(28)45°,the intensity change trend of the blade from the outer edge to the center of the mixer is low.Analysis of the stress distribution of the stirring blade atb=30°45,°60,°,the results show that with the increase ofb(28)45~o,60~o,the stress value of the outer edge of the stirrer blade gradually increases,co MPared to whenb(28)30~oThe stress value at the welding part of the blade is the smallest,and the strength change trend of the blade from the outer edge to the center of the agitator is low.Therefore,whenb(28)30~o,the force distribution on the agitating blade is evenly distributed,and the strength load on the agitating blade welding area is the lowest,which is not easy to break.The angle of the agitating blade isa(28)45°,b(28)30~o.(3)Using CFD software to simulate the mixing performance inside the mixing tank,the results show that the double-suction turbo paddle stirred tank has good speed distribution and solid-liquid suspension performance,and the turbulent kinetic energy and turbulent energy dissipation are reasonably distributed,which is beneficial to the mixing.Analysis of the pressure distribution diagram of the agitator at different speeds shows that as the agitation speed increases,the pressure on the liquid surface increases,the pressure on the back surface of the blade decreases,and the driving force for the pressure difference increases,intuitive interpretation The reason why the suction rate of the self-priming stirrer increases as the stirring speed increases.(4)Contrast and analyze the mixing effect of the three-phase gas,liquid and solid in the double-suction turbo paddle stirring tank with the mixing effect of the materials in the ordinary stirring tank.The results show that the material mixing effect of the double-suction turboprop stirrer is better and the power consumption of the double-suction turboprop stirrer is lower at different speeds.