METHOD FOR REMOVING SULFUR DIOXIDE AND MERCURY FROM FLUE GAS IN A WET SCRUBBER

摘要

The invention relates to a method for removing mercury from flue gases, which method uses a modified milk of lime. Thus the rates of removal of mercury from the flue gases can be significantly improved without significant additional operating costs being incurred. The invention further relates to a method in which a mercury precipitant is added to a flue gas scrubber. Thus the rates of removal of mercury are clearly increased and the reduction of removed ionic mercury to elemental mercury is largely prevented. The invention further relates to a method in which a mercury precipitant is added to a flue gas scrubber and then the scrubbing liquid laden with a precipitant-mercury complex is subjected to a cleaning process in a flue-gas desulfurization scrubbing-water processing system. Advantages of said method are an increased rate of removal of the mercury, the prevention of the reduction or removed ionic mercury to elemental mercury to the greatest possible extent, and the reduced integration of mercury in gypsum.