Research On Mechanism And Efficiency Improving Methods In Ultrasonic Scale Cleaning

The problem of pipeline scaling has been a bottleneck of the production of many fields, because it makes the industrial accidents frequently happen,causes enormous economic losses and environmental pollution.The solution of this problem becomes more important, while all over country advocating building the saving-type society and "energy-saving and ejection-decreasing".Being a newly arisen technique,because of environmental friendly, good performance,low cost,no corrosion,good quality,simplified device,easy to implement, automation,ultrasonic pipeline scaling preventing and removing technique is becoming a new technique which can solve the pipeline scaling effectively.Firstly,this paper analyzes the formation mechanism of pipeline scaling.Based on it,the following analyzes the main effective principle of ultrasonic scale preventing and removing and the influencing factors of cavitation field,and presents effect evaluation mode of ultrasonic scale preventing and technique in pipeline.Then,this paper discusses the current vertical installation mode of transducer which introduces vertical acoustic beam and makes theory analysis of this mode.In order to solve the interference of standing wave field induced by vertical incidence,this paper presents frequency conversion working mode on condition that fluid turbulent and frequency conversion is more than unit processing time.Furthermore,this paper introduces the pipeline LAMB wave theory and makes ultrasonic with certain energy inject into pipeline oblique by the system which consists of wedge acoustic conductance with some angle constraint and ultrasonic transducer with some frequency constraint,thus forms pipeline Lamb.This method was confirmed to be a worth further study which can add the length of cavitation effect of fluid in pipeline by 2h·c₁ sinθ/(c²-c₁² sin²Î¸)^1/2 at least and improve the performance of ultrasonic pipeline scaling preventing and removing.Furthermore,this paper presents a new method which combines sonoluminescence image,hydrophone,CHNN,B-P neural network to study ultrasonic cavitation field.It uses array optical sensor and hydrophone to acquire intensity data of cavitation field sonoluminescence and value of acoustic pressure separately.As projection information intensity data of sonoluminescence is inputted into well trained CHNN neural network to conduct cluster analysis and recognition,and identify distribution type by Hamming distance according principle of choosing the nearest;value of acoustic pressure is inputted to well trained CHNN neural network to conduct intensity prediction analysis,in the aim of studying the acoustic cavitation field.At last,through kinds of well designed experiments in laboratory and analysis under usage condition,we got the selection foundation of kinds of parameters and methods of eliminating standing wave,and proved that oblique incidence was more economics and better performance than vertical incidence.Meanwhile,it is a new idea by applying neural network to acoustic cavitation field.The application of pipeline scaling preventing and removing technique is still on initial stage,the work this paper makes a valuable research in this field,makes certain achievement, and could be guidance for future research and application.