A study on the high-efficiency mixer of the SCR system

Lü, Kai; Liu, Dewen; Wu, Yan; Liu, Shusen; Bai, Shuzhan

doi:10.1051/meca/2020101

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…[24] In addition, the NOx conversion effectiveness will be increased, and the ammonia slip, which is also an emission, will be reduced. [25] [26] UI can be used to evaluate variables other than velocity. For example, Capetillo et…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulations in SCR systems with Emphasis on Uniform Flow at the Catalyst Inlet

Novák

Matas

2022

MATEC Web Conf.

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Selective Catalytic Reduction (SCR) is one of the most widely used technologies for reducing emissions from diesel engines, which are widely used in the energy world. This technology is very complex, and it is not currently possible to address all aspects of it comprehensively. This study focuses on trying to improve the distribution of the exhaust stream at the catalyst inlet using models which represent the most common geometric distributions. Four types of geometries are selected, complemented by a fifth design, which is used as a reference, to find the maximum achievable values of the parameters under study. In this case, mainly the uniformity index is addressed, which indicates how uniformly the selected variable is distributed over the particular area. The study presents possible modifications of the flue gas duct which will be generally applied.

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Section: Resultsmentioning

confidence: 99%

Numerical Simulations in SCR systems with Emphasis on Uniform Flow at the Catalyst Inlet

Novák

Matas

2022

MATEC Web Conf.

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“…It was mentioned in [13] that values over 0.94 [−] are considered as good results, but some authors aim at even higher numbers such as 0.98 [−]. [17] In this study most of the variants meet the lower requirement in order to not disqualify too many variants. Therefore it is necessary to use a higher value, closer to that recommended by Lu et al in their study, so 0.97 is chosen.…”

Section: Fig 3 Illustration Of the Injection Direction Logic 3 Evalua...mentioning

confidence: 94%

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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“…Flow maldistribution at the catalyst's front face causes bigger ageing effects in these zones, resulting in worse overall species conversion efficiency. Lu, et al [17] proposed a new mixer design for diesel engines. It was observed that by employing this mixer, urea droplets fully mixed with flue gas and increased NOX conversion efficiency, with velocity uniformity index and ammonia uniformity index of 0.98 and 0.95, respectively.…”

Section: Review Of Recent Workmentioning

confidence: 99%

3-D Numerical Study of Effect of Urea Injector Location and Intake Cone Geometry on SCR Performance

Bhosale¹,

Patil²,

Dhepe³

et al. 2022

ijirss

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In response to current strict laws aiming to reduce motor vehicle emissions, more and more research projects are being carried out in order to enhance the flow of automotive catalysts. There have been substantial efforts to further refine the SCR technology (selective catalytic reduction) for diesel-powered vehicles. Furthermore, only a little distance from the catalytic input between the exhaust system is available for a mobile SCR system. This therefore leads to an insufficient urea residence period, and evaporation and thermolysis at the catalyst entry cannot therefore be completed. This can lead to substantial secondary ammonia and isocyanic acid emissions. Therefore, fast thermolysis, effective ammonia blend with exhaust gas and reduction of ammonia slip are crucial factors for the deployment of SCR technology on cars. The Computational Fluid Dynamics (CFD) approach is used for optimizing the exhaust gas flow inside the existing catalyst by changing intake cone designs which is intended to be used on Euro VI/Bharat Stage-VI emissions legislation compliant heavy-duty diesel engines in India. This study is divided in to two parts. The first part of the study deals with finding the optimized ammonia injector location, and in the second part, the proposed inlet cone design’s flow velocity uniformity index is estimated and compared with that of the existing SCR catalyst model.

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A study on the high-efficiency mixer of the SCR system

Cited by 6 publications

References 25 publications

Numerical Simulations in SCR systems with Emphasis on Uniform Flow at the Catalyst Inlet

Numerical Simulations in SCR systems with Emphasis on Uniform Flow at the Catalyst Inlet

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

3-D Numerical Study of Effect of Urea Injector Location and Intake Cone Geometry on SCR Performance

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