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NH3-activated electrode is placed in front of the electrode system of pulse corona discharge plasma. There are nozzles on the electrode. Positive DC high-voltage is applied on the nozzle-plate gap. NH3 is injected into the reactor through nozzles, at the same time, activated and treated. Tbese nozzles were proposed in order to make the additional gas pass through corona discharge regions near the tip of nozzles and increase the mount of radicals. The aim is to improve the De-SO2 efficiency by pulse discharge plasma in flue gas. The following topics are investigated and discussed in the paper: De-SO2 effect of single NH3-activated electrode, De-SO2 effect of activated NH3, the relationship between stoichiometric ratio of NH3 to SO2 and De-SO2 effect of activated NH3, mechanism of activated NH3 De-SO2 effect. The experimental result indicates that the De-SO2 efficiency can be increased 5 %-10 96 by activated NH3 on the original base of De-SO2 efficiency.
