Research on spray coupled cooling to enhance the removal of fine particles by cyclone separator

By coupling the spray in front of the condensing heat exchanger, atomization agglomeration and heterogeneous vapor condensation were combined to improve the removal effect of fine particles in the cyclone separator, which is used for the deep treatment of nearlysaturated wet flue gas after the wet dust collector. The particle removal characteristics were investigated through laboratory tests and flue gas bypass tests in a metal smelter. The laboratory results show that spray coupled cooling can significantly enhance the removal of particles by cyclone separators under typical conditions, and had better enhancement effect than spray or cooling alone. By increasing the spray volume and heat exchanger temperature drop, the removal efficiency of fine particles first increased and then tended to be stable, and the optimal removal effect was achieved when the temperature drops by 6℃ and the atomization volume was 0.046 L/m3. The higher the flue gas temperature was, the closer the humidity was to saturation, and the higher the fine particle removal efficiency was. The industrial flue gas bypass tests prove that the system was suitable for nearlysaturated wet flue gas after wet dust removal, and had strong adaptability to fluctuating conditions. When the particle concentration at the inlet flue gas did not exceed 2000 mg/m3, the particle concentration at the outlet can be kept below 20 mg/m3, and the average removal efficiency was above 99.2%. © 2024 Materials China. All rights reserved.