Structure Improvement And Flow Field Simulation Analysis Of Resonance Cavity Acoustic Soot Blowing Device

In the process of industrial production and the power generation of the power station,there is a necessity to use the boiler as an energy conversion equipment,however,in the process of using boiler,because of the existing situations,such as the heavy fuel composition makes the fuel combustion incomplete,which could lead to many questions,such as the generation of the loss,soot formation,the accumulation of slagging,corrosion and so on.First,it could endanger the safety of life and property;second,it could increase the cost of maintenance;third,it could cause the fuel waste;fourth,it may cause production stoppage,resulting in greater economic losses.The ash blower can effectively reduce the fouling and slagging in the boiler and maintain the good heat transfer efficiency of the heat exchanger.Compared with other sound wave ash blowers,the advantages of resonant cavity sound wave ash blower are simple in structure,easy to maintain,and it has been widely used in practical application of blowing ash for boiler.In this paper,with the introduction of the theories,the numerical simulation,the experimental data of the predecessors concerning the aspect,the acoustic characteristics of Hartmann whistle are analyzed and studied by the application of the method of the numerical simulation.Specific tasks are as follows:1.The type and the application condition of the ash blower are described in detail,and the corresponding list is made to summarize it.At the same time,it makes the brief summary concerning the research status at home and abroad about the Hartmann whistle,the core component of the resonant cavity sound wave ash blower.2.Through summarizing the predecessors' studies,the paper comes up with the method of using Hartmann whistle array to increase the blowing capacity of the ash blower.3.By way of the Fluent software,the numerical simulation calculation is conducted,using large eddy simulation(LES)to calculate the transient flow field parameters and capture the data of the source of the sound,by solving FW-H equation,the acoustic pressure signal of the monitoring point is got,then the analysis is conducted through fast Fourier transform(FFT).The paper has studied the influence of the length and diameter of the central rod on the acoustic generator;the impact of different inlet air pressure on the acoustic generator;the influence of the length concerning the disparate resonant cavities on the acoustic generator and the distance of the various spray cavities on the acoustic generator.