Study on the Macro Non-uniform Catalytic De-NOx Reaction Model for SCR System

doi:10.11930/j.issn.1004-9649.201810005

Abstract

Abstract: Based on the characteristics of the catalyst performance, the inherent relationship between the element potential, superposed potential and serial potential, was studied and the macro model of non-uniform catalytic De-NO_x reaction was presented and verified by measurement data. The study results indicated significant impacts of NH₃/NO mole ratio and part catalyst deactivation on the SCR performance, which would be reduced by about 8%-10% due to flue gas distribution deviation corresponding to the ultra-low NO_x emission design. In addition, the NH₃/NO mole ratio at catalyst inlet was determined by the distribution of the upstream velocity, NO_x concentration and ammonia flow at the ammonia injection grid cross-section. The large-scale mixer and the periodical tuning for ammonia injection would be helpful to improve the uniformity of De-NO_x reaction and reduce the partial ammonia slip peak value in the aspects of both design and operations.

Key words: SCR catalyst, non-uniform reaction, model, NH₃/NO mole ratio, distribution deviation of parameter, flue gas mixing, ammonia tuning, ultra-low emission

CLC Number:

TM621.9
X701

SONG Yubao, ZHAO Peng, YAO Yan, XIE Xinhua, WEI Zhenzu, ZHANG Fajie. Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System[J]. Electric Power, 2019, 52(5): 176-184.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201810005

https://www.electricpower.com.cn/EN/Y2019/V52/I5/176

References 20

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Study on the Macro Non-uniform Catalytic De-NO_x Reaction Model for SCR System

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