Theoretical Study of the Influence of Mixing on the Selective Noncatalytic Reduction Process with CH4 or H2 Addition

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• 作者：Qingxi Cao ; Hui Liu ; Shaohua Wu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：September 21, 2011
• 年：2011
• 卷：50
• 期：18
• 页码：10859-10864
• 全文大小：828K
• 年卷期：v.50,no.18(September 21, 2011)
• ISSN：1520-5045

文摘

This work presents a theoretical study of the influence of mixing on NO removal from flue gas by the selective noncatalytic reduction (SNCR) process with CH₄ or H₂ addition, using an elementary reaction mechanism together with a simple approach for mixing proposed previously. The results show that the mixing process affects NO reduction significantly. For he SNCR process with CH₄ addition, the mixing process narrows the temperature window at the high temperature side. For the case with H₂ addition, besides the temperature window getting narrower, the maximum NO removal efficiency declines notably, and NH₃-slip near the optimal temperature rises. This discovery explains the experimental results in the literature reasonably, and it indicates that fast mixing is essential to gain good performance, while H₂ additive is used in practical application. Furthermore, the reason for the distinct effects of mixing on the two DeNO_x processes was revealed by theoretical analysis.