Abstract: The experiment of using desulphurization synergist in 600MW unit desulphurization equipment of a power plant was introduced. Originally, it was necessary to run three slurry circulating pumps to make the SO2 emission concentration can meet the requirement of related standard. After the desulphurization synergist had been used, the desulphurization efficiency was increased obviously, and only two slurry circulating pumps must be run for the same target; the electric energy consumption was decreased by 951kW·h in a hour. After the desulphurization synergist had been used, the characteristics of the slurry in FGD system and the desulphurization gypsum does not vary obviously; especially, the mass fraction of Cl- and the pH value do not vary obviously, which shows that the desulphurization synergist would not enhance the corrosion of the system, and it would not influence on the gypsum quality too. So, the using of desulphurization synergist has obvious economical benefit and social effect, and does not cause negative influence on the desulphurization system.

Key words: flue gas desulphurization (FGD), desulphurization synergist, economical benefit, reduce energy consumption