An Experimental Facility for Rapid Testing of SCR Systems

Boruc, Łukasz; Rogóż, Rafał; Bachanek, Jakub; Kapusta, Łukasz Jan; Jaworski, Piotr; Sutkowski, M.; Teodorczyk, A.; Jarosiński, Sebastian

doi:10.4271/2020-01-2192

Cited by 4 publications

(5 citation statements)

References 35 publications

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“…The application of the conventional, blade-equipped mixer (M1) raised the γ NH3 index to 72-74%. In the case of the double-bladed mixer (M2), with the second mixer generating a swirling flow in the opposite direction, γ NH3 was considerably increased to approximately 86% for both OP1 and OP2, which is an acceptable value in industrial applications [5]. However, it is to be noted that the presented SCR systems were simplified to the maximum extent to compare exclusively the mixer's performance, which explains the relatively low overall scoring.…”

Section: The Ammonia Uniformitymentioning

confidence: 97%

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Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Kaźmierski¹,

Kapusta²

2023

Combustion Engines

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The following research presents a numerical evaluation of existing and conceptual urea-mixing devices used in close-coupled (to the engine) selective catalytic reduction (SCR) systems. The analysis was aimed at the assessment of urea-mixing devices that could considerably enhance the reduction of nitrogen oxides from the diesel-engine combustion process under a wide range of operating conditions, including cold starts. The analysis showed that replacing blade-equipped static mixers with perforated stationary mixing devices may provide a more uniform spatial distribution of ammonia at the inlet to the SCR catalyst and reduce pressure drops generated by mixing devices. Moreover, the conceptual mixing devices, based on combinations of the blade and perforated mixers to develop intensive turbulence, enabled the increase of the mixing length leading to effective decomposition of the urea-water solution (UWS), and provided uniform spatial distribution of ammonia, even for the small-sized mixing systems. However, the intensive mixing was often associated with a significant rise in the pressure drop.

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Section: The Ammonia Uniformitymentioning

confidence: 97%

“…The ammonia developed in the thermolysis and hydrolysis is used to reduce the ammonia oxides to water and nitrogen, according to the governing chemical reactions (Eq. (3)(4)(5)):…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Kaźmierski¹,

Kapusta²

2023

Combustion Engines

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“…It consists of a natural fired burner with a high flow dilution system and heat exchanger system for temperature control, NOx dosing system, urea dosing system, and the test catalyst section. The urea dosing system is controlled by the DSpace control system, integrated into the burner automation system [4].…”

Section: Experimental Investigationmentioning

confidence: 99%

A methodology to assess mixer performance for selective catalyst reduction application in hot air gas burner

Savcı

Gül

2022

Alexandria Engineering Journal

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“…The initial gas flow could be provided in an actual device, for example, by the system discussed in [2]. The occurrence of initial flow disturbances would have an additional impact on the irregularity in the flow rig.…”

Section: Model Characteristicsmentioning

confidence: 99%

“…The working conditions of SCR systems are very changeable. Although challenging, the reconstruction of a broad working range in laboratory conditions can be obtained by specially designed flow rigs [2]. These devices become a crucial enhancement in SCR development, allowing for continuous, long-term tests in precisely controlled conditions without the necessity for actual engine applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the flow rig for UWS spray examination in exhaust system-relevant conditions

Górka¹,

Kaźmierski²,

Kapusta³

2021

Combustion Engines

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In the present study, a flow rig with optical access intended for spray investigations in exhaust system-relevant conditions was analysed in terms of flow and temperature in the spray area using numerical simulations. The operation of the rig was examined for a wide range of exhaust mass flow rates, temperatures and various forms of UWS (urea-water solution) spray plumes. The locations of the injector and thermocouple were verified. Both conventional and flash-boiling injections were considered to assess the effect of the interaction of sprays with a gas flow. The results showed a highly uniform flow in the visualisation area, with only minor fluctuations near the walls. A similar observation was carried out for the temperature distribution. It was found that the extreme operating conditions caused substantial deformations of the spray plumes. However, the selected injector location allowed us to properly observe the spray formation regardless of the flow conditions. The study showed that the examined test rig enabled reliable spray investigations for a wide range of operating points.

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An Experimental Facility for Rapid Testing of SCR Systems

Cited by 4 publications

References 35 publications

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

Numerical evaluation of urea-mixing devices for close-coupled selective catalytic reduction systems

A methodology to assess mixer performance for selective catalyst reduction application in hot air gas burner

Numerical analysis of the flow rig for UWS spray examination in exhaust system-relevant conditions

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