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Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

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Abstract

In selective catalytic reduction (SCR) deNOX systems, the characteristics of gradient flow field have an important effect on the physical deactivation of catalysts. Through computational fluid dynamics (CFD) simulation, it was found that the relative standard deviation (RSD) coefficients of flow field with characteristic flow velocity were 10.03%, 12.48%, and 14.37% respectively. The uniformity of flow field deteriorated with the increase of flow velocity. Furthermore, the alternating flow field was more likely to scour, wear, and block the catalyst channel, leading to its inactivation. Through large eddy simulation (LES) models, it was found that the alternating flow field generated transient turbulent vortices in the system. The high energy area of flue gas is concentrated in the frequency range of 0.03–10 Hz. Pulsation is mainly caused by turbulent eddies of different scales; the higher the frequency, the faster the energy dissipates. In the low-speed flow field, the flow field at the inlet angle of the flue gas was disordered, and the velocity varied from 2.42 to 8.14 m/s. The transient vortices were triggered by the laminar strip** mechanism near the wall. In the high-speed flow field, the number of turbulent vortices increased sharply, especially on the surface of the first-layer catalyst, which greatly influenced its activity. The shear force of the flue gas jet was the triggering mechanism of turbulent vortices in this condition.

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The data that support the findings of this study are available on request fromthe corresponding author. The data are not publicly available due to privacy orethical restrictions.

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Funding

This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant No. LZ23E060001.

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Authors and Affiliations

  1. Department of Energy and Environment System Engineering, Zhejiang University of Science and Technology, Hangzhou, 310023, China

    Yaode Li & Qiao Zhang

  2. Northeast Electric Power University, Jilin, 132000, Jilin, China

    Mingshuai Zhiguo

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  1. Yaode Li
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Correspondence to Yaode Li.

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Li, Y., Zhiguo, M. & Zhang, Q. Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field. Waste Biomass Valor 15, 4473–4486 (2024). https://doi.org/10.1007/s12649-023-02401-3

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