Experimental Research On Acoustic Inhalable Particles Agglomeration

The particulate matter has great harm to human health and the atmosphere environment,and the traditional dust removal technology has low dust removal efficiency.Therefore,it is needed to search for new control technology of the particulate matter.Acoustic wave agglomeration is a kind of method for the pretreatment of flue gas with high strength,which makes small particles agglomerate into large particles by using the high intensity sound field,which is easy to be removed by the dust removal equipment,thus improving the efficiency of dust removal.This paper established a theoretical model of acoustic agglomeration,agglomeration in the sound frequency,sound pressure level,particle size of PM2.5 kernel function,the algorithm of acoustic frequency,sound pressure level,residence time and initial concentration on acoustic agglomeration effect.This paper built the acoustic agglomeration removal of inhalable particles in experiment of coal fly ash in the field of agglomeration was studied.The influence of parameters such as the agglomeration efficiency of acoustic frequency,sound pressure level,the initial concentration of fly ash.In the experiment of the effect of frequency on the efficiency of the combination of sound wave and spray,the aggregation efficiency of PM10 and PM2.5 was the highest,51.62% and 41.99% respectively under the experimental conditions of 1400 Hz and 140 dB.Increasing the sound pressure level can improve the efficiency of the combination of sound wave and spray.The higher the initial concentration,the higher the agglomeration efficiency.When the initial concentration is higher,the agglomeration efficiency is obviously improved when the spray is more than the single sound field.The longer residence time,the higher the agglomeration efficiency.The parameters such as sound wave frequency,sound pressure level and initial concentration of fly ash were studied by the parameters affecting the efficiency of agglomeration after the addition of seed particles.The highest agglomeration efficiency of PM2.5 and PM10 was 48.96% and 61.09%,respectively,in the sound field of 1400 Hz and 140 dB under the experimental conditions.Increasing the sound pressure level can improve the efficiency of the combination of acoustic and seed particles.When the sound pressure level of 120 dB,adding seed particles and without seed particles were compared with the control group,agglomeration efficiency improved significantly;the sound pressure level increased,adding seed particles and without seed particles compared to the control group to improve the efficiency of small reunion.The higher the initial concentration,the higher the agglomeration efficiency.When the initial concentration is higher,the agglomeration efficiency is obviously improved when the seed particles are added into the sound field.The longer residence time,the higher the agglomeration efficiency,but the longer residence time,the smaller the agglomeration efficiency of the control group was smaller than that of the control group.