煤化工锅炉烟气脱硝改造流场数值模拟优化
苏寅彪
（福建龙净环保股份有限公司，福建 龙岩 364000）
摘要： 流场是影响SCR 脱硝性能的关键因素。在煤化工热动厂锅炉烟气脱硝超低排放提效改造过程中，采用CFD 数
值模拟方法对改造前脱硝流场进行了校核，分析了催化剂磨损、脱硝效率低、NH₃逃逸量大等问题的具体原因。之后通
过更改布置导流板，增设阻流板及混合器等措施对脱硝流场进行优化。优化后催化剂入口烟气速度分布、NH3质量分数
分布得到了改善，有利于提高脱硝性能。经流场优化，该提效改造工程实现了NO_x超低排放的要求。
关键词： SCR 脱硝；数值模拟；速度分布；NH₃质量分数分布；流场优化
中图分类号： X701     文献标志码： A     文章编号： 2095-0802-(2020)12-0002-04
Flow Field Optimization of Boiler Flue Gas DeNO_x Retrofit by Numerical Simulation in Coal
Chemical Industry
SU Yinbiao
(Fujian Longking Co., Ltd., Longyan 364000, Fujian, China)
Abstract: The flow field is the key factor affecting the performance of SCR DeNO_x. In the process of boiler flue gas DeNO_x retrofit
for ultra-low emission in a coal chemical thermal power plant, this paper used the CFD numerical simulation method to check the
flow field before retrofit, and analyzed the specific reasons for the problems such as catalyst wear, low DeNO_x efficiency and high
NH₃ escape rate. Then the flow field was optimized by the arrangement of guide plates, spoiler and mixer. After optimization, the
DeNO_x flue gas velocity distribution and NH₃ mass fraction distribution at the catalyst inlet were improved, which was conducive to
improve the DeNO_x performance. Through the optimization of flow field, the retrofit realized ultra-low emission of NO_x.

Key words: SCR DeNO_x; numerical simulation; velocity distribution; NH₃ mass fraction distribution; flow field optimization