Vibration Modal Analysis And Experimental Study Of Stirred Reactor

The stirring reactor converts electrical energy into mechanical energy through a stirring paddle and a transmission device,completes the required stirring operation,and is widely used in the process industry.The design of the traditional agitation system mainly checks the strength and rigidity,and involves little vibration characteristics.The agitation accidents caused by the vibration of the agitating blade and the main shaft sometimes occur.Stirring is operated under the influence of various forces such as fluid force,rotation force,and medium damping.Considering single-constraint vibration analysis cannot effectively ensure the reliability during the operation of the stirred reactor,and it is also impossible for the stirring device containing defects.Conduct safety assessments.The rapid development and continuous improvement of the fluid-structure interaction theory provide a theoretical basis for the vibration analysis of a stirred reactor.In this paper,a finite element method was used to perform modal analysis on a certain type of stirred reactor,and the resonance sensitive area of the equipment was estimated.Based on the combination of vibration test system LMS Test.Lab and ANSYS numerical simulation,this paper analyzed and compared the free state vibration characteristics of the four-blade disk turbine agitator structure,and obtained the first six natural frequencies of the agitator structure.It is found that the first six natural frequencies of the two are relatively close and the relative error is within 10.69%,indicating the reliability of the finite element method for modal simulation.The model of stirred reactor was simplified and based on the CFD principle,the simulation calculation was carried out to obtain the flow information in the flow channel.The vibration modal analysis of the agitating structure under three working conditions including no pre-stress,wet mode and the pre-stress was carried out.In this paper,the traditional theoretical formula and superposition principle method are used to calculate the critical rotation speed of the stirring structure,and compared with the finite element calculation results,the errors are 12.7%and 7.1%,respectively,indicating that the finite element method is effective.At the same time,the harmonic response analysis of the stirring structure obtains the stress and strain frequency response curves.It can be seen more accurately that the stirring system has large strain and stress response at 95Hz,107Hz,and 113Hz and 117Hz,so the optimal design of the stirring structure is performed.Should try to avoid these sensitive areas to prevent resonance.Provides accurate information for the safe operation of the equipment,and has strong theoretical and practical engineering significance.