SCR烟气脱硝装置烟气流场数值模拟

摘要

By using FLUENT software,the numerical simulations were carried on for the SCR system of the 600MW coal-fired station,and the velocity fields and concentration fields in 3 cases were obtained.The results showed that： The efficiency of SCR DeNOx Technology is impacted on whether the flue gas and ammonia distributions of the velocity and concentration fields are uniform in the reactor.The corner vane cascades and gate leafs installed,the non-uniformity of flue gas velocity is less than 15% before the first catalyst layer within the reactor.Under the premise of the best flow field,the vortex mixer can ensure the full blending of the ammonia and flue gas in the reactor.The reliability of numerical simulation is verified through the cold model test,and then the design of the SCR system is guided effectively by the numerical simulations.%采用FLUENT软件对某6OO MW燃煤机组SCR脱硝系统进行数值模拟,获得了3种方案的速度场。结果表明：烟气和NH3在反应器内速度场和浓度场分布是否均匀直接影响SCR技术的脱硝效果。加装导流叶栅和整流格栅,反应器内第一层催化剂入口断面烟气速度不均匀性小于15%。在获得最佳流场的前提下,涡流混合器保证了氨与烟气在反应器中的充分掺混。数值计算结果为导流板、混合器的设计及合理配置等提供重要参考依据。