Spray strategy and mixer optimization in Urea-SCR system based on frozen flow modeling

Liu, Xingyu; Yan, Fuwu; Zheng, Shiqiang; Liao, Jianxiong; Cai, Zhizhou; Hu, Jie

doi:10.1016/j.cep.2022.108810

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…Some studies [29][30][31][32][33][34] have involved developing methods for the miniaturization of an SCR system, including installing a mixer and a chamber, adjusting the chamber's size, changing the direction of flow, and reducing the distance between the DPF and SCR by adding mixers and sleeves. Adding a mixer and a chamber can improve the uniformity of ammonia (NH 3 ) on the catalyst and increase the residence time [30].…”

Section: Introductionmentioning

confidence: 99%

“…Changing the flow direction reduces system size and improves the NO x conversion rate by 60-70% [33]. The addition of a mixer and a sleeve between the DPF and SCR can further reduce system size and improve performance by promoting the urea decomposition reaction [34]. However, these studies did not compare the performance and sizes of conventional SCR systems.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Compact Design in Marine Urea-SCR Systems for Small Ship Applications

Choi,

et al. 2023

Energies

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With increasingly stringent emissions legislation, such as that stipulated by the International Maritime Organization, for nitrogen oxide emission reduction in marine diesel engines, the imperative of curtailing nitrogen oxide emissions from marine diesel engines is intensifying. Consequently, the significance of aftertreatment technologies, including diesel particulate filters (DPFs) and selective catalytic reduction (SCR), is poised to grow substantially. In particular, a redesign is required to reduce the size of DPF and SCR systems for application in small ships. In this study, we varied the shape of the filters in DPF and SCR systems, aiming to achieve a distinct flow pattern and enable overall miniaturization. The performance metrics, including the nitric oxide (NO) reduction rate, NH3 slip rate, and pressure drop, of the redesigned models were compared with those of the conventional model. Computational fluid dynamics simulations were used to compare the performance of the redesigned model with that of the conventional model in terms of NO reduction and pressure drop. The redesigned system achieved a NO reduction rate of 6.9% below that of the conventional system, offering additional noteworthy benefits such as a 50% reduction in both pressure and overall length.

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