Simulation Study On The Application Of Ultrasonic Anti-Scaling Technology In The Tube Bundle Of Heat Exchanger

The scale prevention and removal of heat exchange equipment is an indispensable part in the field of chemical production.Ultrasonic scale control is a new technology which has been popularized in recent years.This technology has many advantages,so it has a broad prospect.Based on the shell and tube heat exchanger,this paper makes a further study on this method.The research results of this paper have certain value for energy conservation and environmental protection,and for improving the ultrasonic scale prevention and removal technology.In this paper,the shear and cavitation effects of ultrasonic descaling are simulated.The finite element analysis software ANSYS is introduced to analyze the shear effect of ultrasonic wave on the heat exchanger through the implicit-explicit solution method in LS-DYNA.In addition,The software of FLUENT is used to simulate the cavitation effect of ultrasound,and the cavitation model is added based on the mixture model to simulate the cavitation effect of the fluid in the heat exchange tube.In a single heat exchange tube,the shear effect of ultrasound on fouling increases with the increase of ultrasonic amplitude and frequency,and decreases with the increase of intermittent ratio.When the pulse length of ultrasonic wave and the number of cycles in unit pulse take a certain value,the shear effect on the heat exchange tube is the best.In the simulation of cavitation effect of a single heat exchange tube,it is found that the high-pressure and low-frequency working condition is the best.In the whole heat exchanger,the change of ultrasonic parameters can affect the shear effect to a certain extent.