Paraffin Inhibiting Mechanism Of Ground Ultrasonic Anti-wax Device And Numerical Simulation Of Its Acoustic Field

Wax deposition is not only bad for the normal production,but also increase the cost and cause waste of energy.At present,high-cost,labor-intensive,frequent and other shortcomings are shown in common methods.When compared with other technologies,the ultrasonic anti-wax device has shown the advantages of low-cost,simple and pollution-free.However,effect principle and the law have been short of sufficient cognitions which has affected the application and dissemination.Therefore,it is of critical importance to study this technology deeply.On the basis of the study of wax deposition and its influence factors,the paper discusses the cavitation,machinery effect,thermal effect and emulsification effect of the related mechanism respectively.This thesis gives the derivation of mathematical model of cavitation.With the help of MATLAB,the paper analyzes the influence of the ultrasonic frequency and acoustic pressure on the cavitation.The calculation indicates that low frequency and high acoustic pressure is good to the effect of cavitation.The source of thermal effect is discussed and the temperature variation model of waxy oil is established.In order to have a better view of paraffin inhibiting mechanism of ground ultrasonic anti-wax device,wax samples before and after ultrasonic treatment are studied by means of GC-MS.The experimental result shows that ultrasonic treatment can cause C-C cleavage reaction.POM is used to observe the morphology of wax crystal.Results indicate that ultrasonic treatment is conducive to inhibiting wax deposition.The experiment system of ultrasonic propagation is established under the present conditions.The paper analyzes the impact of frequency,waveform and filling medium on ultrasonic propagation.It turns out that 20 kHz S-wave with the filling medium of water has a better propagation characteristic.The operation of curve fitting is done by MATLAB and the related attenuation coefficient ?= 0.02772dB/m is obtained.The value can be used in the numerical simulation.The numerical simulation of acoustic field of ground ultrasonic anti-wax device system is studied in this thesis.The research includes the influence of the number of transverters,frequency,ultrasonic power and the configuration of transverters on acoustic pressure distribution in the acoustic field.The simulation conclusions coincide well with experimental results in part four.The numerical simulation results indicate that low frequency and high power contribute to the ultrasonic propagation.Meanwhile,the configuration of transverters with a spiral way in the same axle is good to acoustic pressure distribution in ultrasonic field.