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

Novák, Martin; Matas, Richard

doi:10.1051/matecconf/202236700018

Cited by 2 publications

(6 citation statements)

References 27 publications

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“…This study builds on previous studies, specifically by Novák et al in [13] and [14], thus it is their direct successor and uses the knowledge gained from them in further research. The model in this case is shown in Figure 1.…”

Section: Investigated Casementioning

confidence: 76%

“…The uniformity index of the mass-weighted mean mass fraction of CO(NH 2 ) 2 values of the chosen variants are displayed in Figure 6. 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.…”

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

confidence: 96%

“…This study aims at finding the best possible location for the depicted geometry, which was chosen according to a commonly used geometrical exhaust duct for a SCR catalyst. Some improvements were made to the flow field, which was published in a previous study by Novák et al [13]. In Figure 1 the red dots show the different UWS injection points.…”

Section: Investigated Casementioning

confidence: 99%

“…One of them had uniform inlet flow, which means that at the inlet there is the same velocity magnitude on the surface. The second case had a rotational velocity field at the inlet as mentioned in [13]. This approach was chosen because these are the limit states in which the device can operate.…”

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

confidence: 99%

“…The uniformity index was described in a previous article [13]. The same evaluation is used here but the variable is different in this case, particularly as it is a mean mass fraction of the gaseous component of urea.…”

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

confidence: 99%

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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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Section: Investigated Casementioning

confidence: 76%

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

confidence: 96%

Section: Investigated Casementioning

confidence: 99%

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

confidence: 99%

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

confidence: 99%

See 3 more Smart Citations

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

Novák,

Matas

2023

MATEC Web Conf.

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Design and Verification of Key Components of a New Selective Catalytic Reduction System in a Petrochemical Captive Power Plant

Wu,

Liu,

Zhang

et al. 2023

Processes

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A new selective catalytic reduction (SCR) system for captive power plants in the petrochemical industry was analyzed. The key components suitable for the target SCR system were obtained using computational fluid dynamics (CFD) numerical simulation combined with a cold physical model. The structural characteristics of the SCR system were studied, and corresponding design schemes were obtained for the key components, such as the guide plate, the ammonia injection grid (AIG), the static mixer, and the rectifier grille. The distributions of the flue gas velocity and the NH3 concentration within the flue cross-section in front of the first layer catalyst were studied in detail. Synchronously, the pressure loss and the temperature reduction characteristics in the SCR system were also considered. CFD results showed that the average standard deviation of the flue gas velocity was about 11.61%, and the average standard deviation of the NH3 concentration distribution could reach about 3.79% under the five operating conditions. It could be concluded that the uniformity of the flue gas velocity and the NH3 concentration distribution within the above flue cross-section was guaranteed by comparing to the design standard of 15% and 5%, respectively. It was further found that the maximum pressure loss between the inlet and the first layer catalyst was about 106.64 Pa, and the temperature reduction characteristic of the entire SCR system could be maintained within ±0.01 °C, which indicated that no extreme adverse effect arose due to the introduce of the key components. The cold physical model experiment was accordingly conducted to verify the reliability of the above CFD results. The cold physical model experiment results showed that the average standard deviation of flue gas velocity was about 8.82%, and the average standard deviation of NH3 concentration distribution could reach about 4.21%. The maximum biases for the standard deviations of the flue gas velocity and the NH3 concentration distribution were approximately 4.83% and 1.18% under the five operating conditions. Based on the good agreement of the research results via the two different methods, the designed key components of a new SCR system could be confirmed to be feasible, which would benefit the deNOx performance of the SCR system.

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

Cited by 2 publications

References 27 publications

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

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

Design and Verification of Key Components of a New Selective Catalytic Reduction System in a Petrochemical Captive Power Plant

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