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"Mixing" is one of the most common and important process methods in the industrial process, and it is also an important unit for improving and activating the process manufacturing. It also requires the use of stirring units for heating, cooling, liquid extraction and gas absorption and other physical changes. To achieve the expected effect of accelerating the mixing or dispersing process of the substance delivery, and achieve the process of excellent alternating mixing and stirring. Therefore, the flow characteristics of the fluid in the mixing tank, the internal design of the stirring tank, the type of impeller and the structural load all deeply affect the quality of mixing, and which can directly affect the quality of the material product after mixing. In addition, the characteristics of the material stirred are Toxic substances, the stirring tank must be closed and the impeller assembly must also conform to the resonance frequency and structural load characteristics of the stirring flow field, so that the toxic fluid substance can achieve the expected stirring effect during the stirring process. Therefore, the structural stress and strain value of the impeller assembly in the agitation equipments needs to be discussed. The research in this paper is to use ANSYS FLUENT fluid module software and ANSYS Workbench finite element method to simulate the analysis of the status of flow field inside the agitator tank, the stress and strain of the impeller, and the prediction of modal equivalent analysis at resonance frequency. First of all , use ANSYS FLUENT fluid software to simulate the form of the flow field inside the agitator tank, and then use ANSYS Workbench finite elements to simulate the deformation of the stress strain and total displacement of the impeller assembly at different speeds to achieve ANSYS fluid-solid interaction effect analysis . Finally, predict the modal appearance and break-down point of the simulated impeller assembly at different resonance frequency. During the rotating operation in the mixing tank tank, the one-way fluid-solid interaction prestress is generated due to the influence of the flow field velocity and pressure. The total deformation and strain stress are at the tip and the root of the impeller. It can be seen that the thickness value of the agitating vane will affect the rotation of the agitator. One of the reasons is that the thickness of the vane must withstand the dynamics of the fluid wave without being damaged, deformed and bent, and the weight of the impeller assembly must be reduced to achieve the purpose of saving the production cost of the stirring system; In addition , with increasing the rotation speed (rpm) of the impeller , the impeller assembly , the deflection of the structural rigidity , the maximum equivalent stress and strain of the rigid structure of the impeller assembly also adopt a progressive linear growth phenomenon.
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