SCR脱硝催化反应模型的建立与验证

为研究硫酸氢铵在低温选择性催化还原( selective catalytic reduction, SCR)催化反应器中的生成条件、沉积及富集规律和催化剂再生技术,设计和搭建参照实际低温脱硝工程的中试规模的SCR反应器系统。在实验过程中,不能准确测量出沿催化剂轴向或在反应截面上NH3或NOx质量浓度的分布情况,而该情况对实验研究是比较重要的。为此,采用化学反应动力学和计算流体力学建立了SCR脱硝催化反应模拟模型,通过在相同反应条件下分别设定不同氨氮比、温度,比对实验测量数据间的变化趋势与模拟计算结果的一致性,验证所建催化反应模拟模型的正确性。该模型可为分析研究硫酸氢铵在反应截面上或沿催化剂轴向的生成条件、沉积及富集规律提供数据支撑,同时也能用于实际SCR脱硝工程脱硝催化反应过程的模拟。

Establishment and Validation of the Model for SCR DeNOx Catalytic Reaction

To study the conditions generated of ammonium bisulfate in the reactor of selective catalytic reduction ( SCR ) catalytic at low temperature, rules of its deposition and enrichment, and its renewable technologies, a pilot-scale system of SCR reactor was designed and constructed based on the actual SCR project at low temperature. During the experiment, the distribution of NH3 or NOx concentration could not be accurately measured which was axially along the catalyst or on the cross section of reactor,and which was more important to the experimental study. So a simulative model was created to follow kinetics of chemical reactions and computational fluid dynamics, whose correctness was verified by comparing consistency of the changing trends from experimental data and simulations, by different ammonia-nitrogen ratio, different temperatures and different rate of SCR set under the same conditions of reaction. The model can provide support for data analysis and research on the conditions generated of ammonium bisulfate in the reactor of SCR catalytic at low temperature, rules of its deposition and enrichment,while it could be used to simulate the process of catalytic reaction in the actual SCR project.