Abstract: With the increasingly complete and strict environmental protection policies in China,the demand for the treatment of " white plumes" formed by the saturated wet flue gas discharged into the atmosphere after wet desulfurization in power plants has increased.Through the research on the formation and elimination mechanism of white plume,the advantages,disadvantages and application prospects of the current technology for eliminating white plume in coal-fired power plants were analyzed. The existing technologies for eliminating white moist plume at home and abroad mainly include flue gas condensation,flue gas heating,condensation reheating,swirling dehumidification,solution absorption,and membrane separation.All of the flue gas cooling,flue gas heating,and condensation reheating technologies use direct/indirect heat exchange to change the state of flue gas at the outlet to achieve whitening.The technology is relatively mature and has been applied in engineering,but it has high energy consumption and high anti-corrosion requirements of heat exchange equipment;GGH has high cost and high energy consumption.Although the cyclone dehumidification technology has a large load,pressure reduction and simple structure,its whitening effect is limited; The technology of solution dehumidification and membrane separation is still in the experimental research stage at present,and it has not been used in the wet flue gas treatment process of coal-fired power plants due to its own technical defects.Instantaneous pressure condensation dehumidification technology of flue gas uses the flow field structure to instantly increase the partial pressure of water vapor,so as to make it liquefied.At the same time,steam condensation and liquefaction will release a lot of latent heat,which can improve the flue gas outlet temperature.The synergistic effect of flue gas dehumidification and heating finally ensures the saturation of wet flue gas white.In this paper,the characteristics and adaptability of various treatment technologies were discussed and compared. Combined with experiments,it is found that the instantaneous pressurized condensation and whitening technology of flue gas can effectively recover the water vapor in the wet flue gas.The fine particles and other pollutants in the saturated steam are removed as condensation nuclei by the condensation droplets during the steam condensation process. At the same time,other heat exchange equipment is not needed,which reduces energy consumption.It is one of the potential technologies in the flue gas whitening technology.