国电泰州电厂2×1 000 MW二次再热机组NOx、SO2超低排放技术应用

为使烟气中NO_x、SO₂排放达到超低水平,国电泰州电厂二期2×1 000 MW超超临界二次再热燃煤发电机组SCR脱硝系统采用了驻窝混合技术,烟气脱硫采用了单塔双循环湿法脱硫技术。简介驻窝混合技术机理和单塔双循环脱硫技术原理,介绍国电泰州电厂1 000 MW机组烟气脱硝脱硫设计方案及实施效果。实践结果表明,国电泰州电厂1 000 MW机组采用上述2项技术后,烟气中NO_x和SO₂实现了超低排放,NO_x和SO₂脱除效率分别达到90.3%和99.6%,其排放质量浓度分别为31 mg/m³和15 mg/m³,远低于国家超低排放限值,且优于燃气轮机排放水平。

Applications of NOx and SO2 Ultra-Low Emission Technologies for the 2×1 000 MW Double Reheat Units in Guodian Taizhou Power Plant

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.