Research On Fouling Removing In Pipelines Of Ultrasonic Guided Waves Pipe Based On FPGA

Pipelines have great advantages in transporting fluids,which play an important role in the rise of the economy and social development.Fouling in pipelines is a common issue that may be paid attention to by the oil and gas,food and many other industries.It forces related industries to regularly remove fouling and even replace pipes.If the descaling operation is not timely or improper,it may also lead to deformation,leakage or even burst.Compared with the traditional descaling method,ultrasonic guided waves have been widely concerned because of their advantages of long transmission,wide coverage and non-stopping.According to the above problems,this paper proposes an environmentally friendly pipeline descaling method based on ultrasonic guided waves.The technology on fouling removing in pipelines of ultrasonic guided waves based on FPGA not only retains the advantages of the traditional descaling method,but also has the advantage of extensively descaling without affecting normal production.During a wide range of cleaning,this method not only saves time and resources,but also achieves efficient,fast,safe descaling target.In this paper,the theoretical analysis and practical research on the fouling removing technology in pipelines of ultrasonic guided waves based on FPGA is carried out.Firstly,FPGA-based signal source generator is designed by FPGA development platform and Verilog HDL code.As a part of the descaling system,it can generate the transducer drive signal to meet the subsequent descaling part.Secondly,descaling model of liquid-filled pipeline based on ultrasonic guided waves is established by finite element simulation software COMSOL.Two descaling scenarios,single sensor case and the sensor array one,are studied.The optimal excitation frequency of waveform signal is selected by the scanning laser vibrometer.The simulation shows that the sound pressure is alternately distributed with positive pressure and negative pressure.The sound pressure and stress amplitude of the array sensor is larger and more uniform.Finally,the design of the CaCO3 descaling scheme and the related descaling experiment are introduced in detail.The data of the electron microscopy and energy spectrum analysis experiments were analyzed,and the experimental results show that the ultrasonic guided waves excited by the piezoelectric ultrasonic transducers can remove the CaCO3 fouling in the liquid-filled pipelines effectively and the descaling effect of the latter case is cleaner than the former one.Moreover,the pipelines have no obvious damage,so it can be concluded that the descaling technology in pipelines of ultrasonic guided waves based on FPGA can safely and effectively remove the CaCO3 fouling on the inner wall of the liquid-filled pipelines.