Abstract: In order to realize the ultra-low emission of NO_x and SO₂ in the flue gas, the eddy-mixing technology and the single tower with dual loop desulfurization technology are used in the SCR de-NO_x system and the flue gas desulfurization system respectively in the 2×1 000 MW ultra-supercritical coal-fired generating units of Guodian Taizhou Power Plant Phase Ⅱ Project. In this paper, the principles of the eddy-mixing technology and the single tower with dual loop desulfurization technology are introduced, and the design scheme and the implementation effect of the flue gas desulfurization and denitrification of the units are presented as well. The practical results show that by adopting these two technologies, the ultra-low emission of NO_x and SO₂ in the flue gas has been achieved with the removal efficiencies of 90.3% and 99.6% and the emission concentrations of 31 mg/m³ and 15 mg/m³, respectively, which are far below the national ultra-low emission limits, and even better than the emission level of gas turbines.

Key words: coal-fired power generation, 1 000 MW, ultra-supercritical unit, double reheat cycle, ultra-low emission, eddy-mixing, SCR denitrification, single tower with dual loop desulfurization, demenstration power plant