The Performance Of Ultrasonic Atomization On Collocting Fine Particulate Matters

In recent years, the primary air pollution in most cities of china is fine particulate matter, which caused great threat to the natural environment and human health, so it is strict to controlling emissions of fine particulate matter at home and abroad. In spite of the conventional dust removal technologies having high collect efficiency, it has inefficient on trapping smaller size of the particles. Using the pre-reunion technology can increase the size of the fine particulate and then conventional dust equipments were used to collecting that reduce the emissions concentration of fine particulate matter.Ultrasonic atomization dust removal technology is one of the new and improved dust removal technology based on the heterogeneous condensation reunion principle and it has the advantages of high collection efficiency and high remover fine particulate matter, which can promote reunited with dust particles effectively. Because of the minimal amount water in the process of catching dust, the problem of the large water consumption is avoided.The ultrasonic atomization technology combined with the filtration dust removal technology was researched. At first, fine particulate matter was pre-reunion by ultrasonic micro-droplet to increasing the size of the matter until the range of the conventional removal dust, and then the fine particulate matter was trapped by fiber filter dust removal equipment. In the experiment, ultrasonic atomization dust removal system was designed and construction and use the 5000 mesh of calcium carbonate particle simulation dust, the PP fiber as filter material and ultrasonic micro-droplet was provided by an air compressor and ultrasonic atomizing nozzle. The influence and the change rule of the different operating conditions (spray, filtration rate, filter material thickness, filter fill rate, dust concentration, ratio of fog and dust, etc.)on the collection efficiency and pressure drop were researched, it can be found, adding ultrasonic micro-droplet in the front of the filter material having highest collection efficiency and smaller pressure drop; Collection efficiency increases and the process pressure drop decrease as the wind speed decreases; Collection efficiency and pressure drop process increases with increasing thickness of the filter material, but when collection efficiency is higher, increasing the thickness of the filter has little effect on the collection efficiency, pressure drop process will follow the increase; Collection efficiency and process pressure drop increases with the filter medium fill rate increase, but when the filter fill rate reaches a certain level, the collection efficiency increased slowly; Collection efficiency and process pressure drop increases with increasing concentration of fine particulate matter; Collection efficiency increasing with the fog powder ratio increasing, and the rate of increase gradually decreases and the process pressure drop at first increased and then decreased and then increased tendency with the fog powder ratio increasing; Adding an appropriate amount of surfactant in the spray solution will help improve collection efficiency and reduce the pressure drop process; Based on the analysis of dimensional, a mathematical model was founded to predict the collection efficiency of the system.In this paper, adding ultrasonic mist before the filter dust collector to improve the collection efficiency of the device, reduce process pressure drop, and adding the appropriate amount of surfactant in the atomized solution to improve the collection efficiency of the device. Dimensional mathematical model analysis, conducive to the optimal design of dust removal system based on.