Recent development of five flue gas demercuration technologies were summarized

namely removing mercury by the present pollution control equipments such as dust remover

desulfurization and denitrification device;by coal additive;by adsorbent injection;by oxidization;and by optimizing the operation parameters of boiler.Furthermore

the influence of factors like halogen

HCl

and flue gas components on mercury removal efficiency was analyzed.The efficiency and the corresponding advantages and disadvantages of different technologies were compared.The results showed that

for the boilers with dust remover

desulfurization or denitrification(SCR) devices

the most economical demercuration method is to take use of the present equipments.Removing mercury by coal additives

adsorbent injection and oxidation has higher efficiency

which is the developing direction of demercuration technique.