Research On The Effect Of Distribution Of Excitation Transducers On Pipeline Fouling Removal Based On Ultrasonic Guided Wave

Pipeline transportation plays an important role in human production and life,but a large number of fouling are produced in mature,complex and huge pipeline system.Fouling in pipeline system of industrial production lead to reduced production efficiency,excessive energy consumption and contaminated pipe contents.Traditional chemical fouling inhibition methods and physical cleaning methods have their limitations.The chemical fouling inhibition method has the disadvantages of large environmental burden,small descaling range,and high cost.Physical descaling methods may cause potential damage to the inner wall of the pipeline that could pose a safety hazard for the accident.How to effectively remove fouling of pipeline has become an urgent problem in industrial production and daily life.Based on the above problems,an innovative method of zero-pollution,real-time online and large-scale removal is proposed in this paper,relevant scientific research results are published in SCI journals?Clean Technologies and Environmental Policy?(Q2,IF:2.374).This paper mainly studies the feasibility of pipeline descaling by using ultrasonic guided wave under specific distributed mode of excitation transducer.Through multi-physical field simulation of quasi-axisymmetric mode and non-axisymmetric mode of excitation,the propagation characteristics of guided wave in liquid-filled pipeline are explored,and the driving frequency of ultrasonic transducer is theoretically supported.It is found that the displacement field and sound pressure field of guided wave in quasi-axisymmetric mode are symmetrical and uniform,which provides a theoretical basis for uniform fouling removal.The research focuses on the influence of the distribution of axisymnetric excitation transducers on guided wave scale removal because of its great significant for production and living condition.Based on the experimental hardware platform,the characteristics measurement and fouling removal experiments are carried out,and the results are verified by multi-physical field simulation.In the removal experiment by using ultrasonic guided wave under excitation distribution of quasi-axisymmetric mode,the resonance frequency of the system is measured by laser vibrometer and compared with the result from the simulation model.For the evaluation of fouling removal effect,the macro method of mass analysis is adopted.In addition,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS)were used to analyze the microscopic morphology and composition of the samples before and after fouling removal.Based on the certain experimental conditions of this subject,the results are as follows:the simulation model and experimental frequency characteristics coincide with each other,the resonance frequency of the system measured in the experiment appears near the theoretical frequency 32.5KHz and 38KHz,which obtained from the simulation;for lm pipeline,after an hour of effective descaling time,fouling removal is effective.Based on the results from SEM and EDS,the morphology and composition of inner surface of the pipe changed in opposite directions before and after removal.According to the above three results,the ultrasonic guided wave with excitation distribution under quasi-axisymmetric mode can uniformly and effectively remove the pipe fouling.