声凝并联合雾化预处理及其在过滤除尘中的应用

Pretreatment based on combined effect of acoustic agglomeration and atomization and its application in air filtration

根据声凝并理论和雾化湿式除尘理论,建立了燃煤飞灰在声场联合雾化加湿作为预处理的过滤式除尘实验装置。分别在声场、雾化加湿、声场与雾化加湿相结合3种预处理条件下进行实验,确定合适的加湿量范围,得出不同条件下燃煤飞灰的去除效果。在声场联合雾化加湿条件下,分别研究了声压级和雾化加湿量对飞灰的去除率的影响。结果表明,声场和雾化加湿联合作用能有效提高燃煤PM2.5去除率。以声场联合雾化加湿作为预处理进行过滤除尘实验,结果表明,虽然对高效滤料的除尘效率提高作用有限,但是该预处理可减轻滤袋负荷,有效延缓压差增长,降低清灰频率。由于采用表面覆膜滤材,加湿量控制得当可避免产生"糊袋"现象。

Based on the theory of acoustic agglomeration and atomization humidifying,an experimental device was set up to study the pretreatment based on combined effect of acoustic agglomeration and atomization,and its application in air filtration. Experiments were conducted in the following three cases: sound waves,atomization humidifying,combining sound waves and atomization,and concluded the removal efficiency of coal fly ash under different conditions. Under the condition of combining sound waves and atomization,the removal efficiency of coal fly ash was studied under different sound pressure levels and different quantities of humidification.Results indicate that the combination of acoustic waves and atomization humidifying is an effective technology to remove fine particles. When sound waves combining atomization is used as the pretreatment of bag filter,results show that filtration efficiency raises unobviously,while filter load is reduced,growth of pressure differential is slowered,frequency of back flushing is decreased. As the result of using membrane filer material and appropriate quantity of humidification, ' paste bag' problem would not occur.