基于数值模拟的水煤浆锅炉SCR脱硝系统流场优化

Flow field optimization for SCR system of coal-water slurry boiler

以水煤浆锅炉SCR脱硝系统为研究对象,以FLUENT模拟计算为手段,探究了合理的导流板设计对SCR反应系统流场及氨浓度分布的重要作用。结果表明,加入导流板后,第一层催化剂上端速度分布偏差和氨浓度分布偏差分别为14.32%和4.86%,压降为893 Pa,满足预期目标。进一步通过改变SCR出口水平烟道导流板长度及角度,以SCR出口速度分布云图为判断基准,探究了合理的导流板结构设计对流场均布的重要性。

In this paper,the SCR denitrification system of coal-water slurry boiler is taken as a research object.Fluent numerical simulation is used to explore the influence of splitter installation structure on the distribution of the flow field and the ammonia concentration.Results show that both the velocity nephogram and ammonia concentration distribution nephogram distribute uniformly with the splitter installation added.The speed deviation and ammonia concentration deviation are 14.32%and 4.86%,respectively.Furthermore,in order to better illustrate the influence of splitter installation structure on the distribution of the flow field,a set of splitter installation which located in SCR outlet were selected as the research object.By comparing the change of flow field after the splitter installation length and angle changed to achieve the above objections.