基于FLUENT软件的有限速率模型对选择性非催化还原工艺的模拟

Simulation of Selective Non-catalytic Reduction Process by the Model of Laminar Finite Rate With FLUNT

介绍了利用FLUNET软件中有限速率模型对氨作还原剂的选择性非催化还原(selective non-catalytic reduction,SNCR)脱硝的模拟方法,对模拟结果进行了分析。引入简化后的SNCR工艺化学反应机理并对所采用机理进行了Chemkin软件的模拟修正,使模拟结果与实验结果拟合良好。通过对试验的不同工况的FLUENT模拟及分析可知,修正后的简化模型可以正确反映温度、氨氮比及泄漏氨对工艺效果的影响。由于简化模型的引入,避免了SNCR工艺FLUENT模拟中大量基元反应造成的计算量过大的问题,这使得对大型锅炉的SNCR工艺的NOx脱除模拟变得可行。

Simulation method of non-catalytic reduction of nitrogen oxides （SNCR） by ammonia using the model of laminar finite rate was introduced and the analysis of the results was carried out. The simplified SNCR process model was incorporated and the parameter of model was modified to make the simulation results consistent with the experimental results basically. The result show that the FLUENT simulation with simplified model can reflect the influence of temperature, NH3/NOx and NH3 slips to the process through the simulation of different conditions of the experiments. For incorporation of the simplified SNCR mechanism, large amount of computation in the FLUENT simulation is avoided, which makes the simulation of the application SNCR process on industrial boiler feasible.