Optimization of the Urea SCR injector based on entropy generation minimization and entransy dissipation extremum

Ye, Jiedong; Tan, Gangfeng; He, Zixuan; Alex, Frimpong J.; Peng, Dengzhi; Zhang, Zhiqing

doi:10.1016/j.ijheatmasstransfer.2023.123935

Cited by 11 publications

(2 citation statements)

References 45 publications

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“…The breakup model of the droplet, the Taylor analogy breakup (TAB) model (used in numerical analysis), was applied to model the droplet decomposition process. The urea-water solution droplets were tracked using the Eulerian framework's Lagrangian particle approach, and droplet and gas phase two-way coupling was considered [39].…”

Section: Urea Spray Model and Reaction Modelmentioning

confidence: 99%

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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Section: Urea Spray Model and Reaction Modelmentioning

confidence: 99%

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

Choi,

et al. 2023

Energies

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“…There are authors who deal with different conus angles of the injected UWS, such as [7] where Ye et al looked at the influence of different flow velocities and droplet size. The influence of the spray angle, droplet size and injection velocity were investigated by Capetillo and Ibarra [8] who concluded that all of these three variables have a significant influence on the uniformity index of ammonia which is the main index used to evaluate their study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations in Selective Catalytic Reduction Systems with an Emphasis on Injection Location

Novák,

Matas

2023

MATEC Web Conf.

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This paper is a follow-up study to previous research conducted in the field of Selective Catalytic Reduction systems. The objective of this particular study is to identify a suitable injection location for urea water solution within a chosen geometry, matching the distribution commonly used in these systems. Numerical simulations using ANSYS Fluent software were conducted, utilizing an evaporation model that had been fine-tuned based on experimental data. The droplet size injected from the nozzle was also determined from experimental data. The boundary condition applied to the walls was the “Wall-Jet” model, chosen as a compromise for time efficiency. Over one hundred simulations were conducted at more than fifty locations, with the results presented here serving as interim findings. Future research will investigate the application of the recommended injection sites in geometries similar to those used in SCR systems.

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Effect and optimization of axial non-uniform catalyst on SCR characteristics based on fuzzy grey correlation method

Luo,

Xu,

et al. 2024

Res Chem Intermed

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Optimization of the Urea SCR injector based on entropy generation minimization and entransy dissipation extremum

Cited by 11 publications

References 45 publications

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

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

Numerical Simulations in Selective Catalytic Reduction Systems with an Emphasis on Injection Location

Effect and optimization of axial non-uniform catalyst on SCR characteristics based on fuzzy grey correlation method

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