Dust removal performance of a new type porous plate electric dust collector for sintering plants

Electrical precipitators in the sintering plants are facing with the excessive emission of particulate beyond the standard limit， and the new type of porous dust collecting plate can promote the overall dust removal performance， to achieve the ultra-low emissions of sintering plants. The article first conducted a sampling and analysis of sintering ash in industrial electrostatic precipitators， and then used COMSOL Multiphysics to study the electric field and flow field within the dust collection areas of two types of plate shapes. Finally， based on the ash sampling results， it simulated and predicted the dust collection performance. The dust removal performance of the new porous plate electric dust collector was verified by practical engineering cases. The results showed that the collection efficiency of the electrostatic dust precipitator in the flue gas was low when the dust was in the range of 0.01 to 10 μm. The collected dust contained more than 50% Fe and its oxide， which had a certain regeneration value. The overall specific resistance of the dust was about 1012 Ω·cm. The average dust-collecting field strength of a porous plate was higher than that of a flat plate. The opening of the plate reduced the wind speed of the electric field near the plate surface and slowed down the secondary dust lifting effect near the plate surface. Under the condition of 66 kV external voltage， the collection efficiency of particulate matter in the range of 0.01~10 μm was increased by using a porous plate electrostatic precipitator， which can effectively improve the efficiency of electric field capture at the end. The results can provide reference values for the application of new porous plates in the ultra-low emission of sintering flue gas particles.