The characteristics of fine particles in flue gas after the limestone-gypsum wet desulfurization(WFGD)process are very different from those produced by coal-burning

which is related to the desulfurization process. The migration and transformation characteristics of fine particles in flue gas were analyzed by using test data of selfbuilt ultra-low emission test bench and actual power plant. The results show that

the number of fine particulate matters at the tower outlet at 70 ℃ was about 1×106/cm~3 smaller than that at 150 ℃. Compared with three-layer spraying

the removal efficiency of the number and mass concentration of fine particles of five-layer spraying increased by about 11.5% and 18.9%

respectively. Adding clean water sprayer and tray tower

as well as applying double-cycle system

can effectively reduce the mass concentration of fine particles in flue gas at the tower outlet.Moreover

the double-tower double-cycle desulphurization technology has the best removal effect

the mass concentration of fine particles at the tower outlet can reach lower than 10 mg/m~3.