摘要
选择性催化还原系统内流场分布的均匀性对脱硝效率具有重要影响。采用数值模拟方法,对某热电厂170t/h燃煤机组SCR脱硝系统进行优化设计研究。通过沿烟气流动方向逐步优化布置导流叶片、整流器以及调整烟道外形等措施改进流场分布。结果显示,喷氨格栅处与首层催化剂入口流速不均匀系数分别降低至7.56%和2.56%。优化结果可为类似项目高效SCR系统设计提供有效参考。
The denitrification efficiency of a selective catalytic reduction(SCR)system is greatly influenced by the uniformity of flue flow filed.Numerical simulations were carried out on the SCR system of a 170t/h coal fired thermal power unit.By adding such components as guide vanes and flow straighteners along the streamwise direction,as well as adjusting the configuration of ducts,the optimized design scheme was obtained.The result showed the uniformity coefficients were reduced to 7.56%and 2.56%at the AIG position and the first catalyst layer.The study provides reference for the design of high-efficiency SCR systems.
关键词
选择性催化还原
优化设计
数值模拟
流场
selective catalytic reduction
numerical simulation
optimal design
flow field
