The Research Of Flow-induced Vibration In A Heavy Catalytic Cracking Oil Slurry Heat Exchanger

It is an extremely complex phenomena that induced-vibration takes place in the tubes in a heavy catalytic cracking oil slurry heat exchanger,and it is challenging and main research to determine the size and position of the vibration and stress by scholars at home and broad,besides calculate the press and the velocity of fluid in shell.This paper introduced the research status,causes of induced vibration happened.At present,authoritative TEMA standard has not particularly contained the content on vibration damage,in consequence,to dig out the induced-vibration is imperative job.The actual operating condition in an oil slurry heat exchanger was simulated and analyzed,and the axial stress and the size of the vibration frequency in this high temperature and press field was calculated.It is the main reason for vibration that the fluid flows in shell,and the vibration is connected with the tubes,inherent frequency,the analysis of the position and tendency of flow-induced vibration can provide the reference for the prevent of the vibration damage.In this paper,we choose the heavy catalytic cracking oil slurry heat exchanger as object of analysis and analyze the fluid-structure interaction between the tubes and the outside fluid,what is more,dynamic behaviour of tubes under the action of the bow baffle,The content includes:1.We apply software ANSYS to select suitable shell element,beam element and fluid element and to build two kinds of simplified models about tubes and the fluid field.Mapped meshing method is used to mesh the models.2.Under the fixed temperature and press,we conduct the modal analysis to the two models considering the coupling of tubes and fluid,so that we achieve the fore 12 stages frequency and mode of vibration.By compared with the analysis results,we can conclude that the frequency of model 2 is lower than the model 1,while the higher velocity and stronger vibration happens.3.Considering fluid-structure interaction,we used transient dynamics of ANSYS to calculate vibration displacement,the distribution of the force and the change.