Oxy-fuel combustion is the most effective technology in CO2 emission control.The mercury speciation in oxy-combustion flue gas

especially the influence of high content H2 O and CO2 on the chemical reactions among the flue gas oxidative components(SO3

SO2

NO

NO2

HCl

O2

CO)

as well as the interaction between the Hg0 reactants and components

were investigated

which was the key of controlling Hg emission with application of new oxy-combustion technology.From consulting references we find

during different combustion processes

the flue gas component will be different

both the reaction mechanism between the Hg0 and flue gas components and the morphology change mechanism of Hg0 will deeply affect the emission control mode of Hg0.The mercury emission rules and control mechanism based on the conventional coal combustion flue gas may not be suitable to those based on the oxy-combustion flue gas.