The working draft BAT reference document presented by the European Commission in the third quarter of 2015 considerably modifies the limits for primary emissions of pollutants, such as SO2 and dust and introduces new items into the list of monitored pollutants - such as Hg. In the case of newly designed and existing facilities, for which a long-term operation is planned, such changes mean a necessity to adjust to the planned new regulations and planning and implementation of new technical solutions, the examples of which shall be presented in this paper. One of those completely new solutions involves the construction of mercury capture systems. Positive laboratory results regarding gaseous mercury oxidizing compounds have become an argument for commencing tests in industrial conditions. To that end, an autonomous system for preparing and dosage of additives has been designed and built, which allowed for the execution of numerous tests using two selected additives: AdditiveMn and AdditiveCl. At the first stage, the research focused on hard coal, using the possibility of capturing oxidized mercury together with particles in the electrostatic precipitator. Further analysis is now being implemented for lignite-fired boilers, this time making use of the possibility of capturing oxidized mercury in the wet flue gas desulfurization plant. This paper shall present a summary of research regarding the possibility of reducing oxidized mercury emissions in the electrostatic precipitator for large hard coal-fired power units. The paper shall also present effects of the introduction of BAT conclusions on the example of a few projects: of the construction of a new 910 MW hard coal-fired power unit and modernization of the semi-dry flue gas desulfurization plant in a hard coal-fired power plant. The paper shall present the decision-making process from conducting analyses up to the adoption of execution solutions which have been already implemented or solutions being currently implemented in selected facilities.
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