A Study of a New Aftertreatment System (2): Control of Urea Solution Spray for Urea-SCR

Nishioka, Akira; Sukegawa, Yoshihiro; Katogi, Kozo; Mamada, Hiroshi; Kowatari, Takehiko; Mukai, T.; Yokota, Hiroshi

doi:10.4271/2006-01-0644

Cited by 30 publications

(7 citation statements)

References 3 publications

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“…Optimal atomization, mixing, and evaporation conditions play a vital role in achieving a high NO X conversion with minimum NH 3 slip in a SCR system. Therefore, urea distribution uniformity before the SCR catalyst is a significant factor affecting the NO X conversion efficiency and NH 3 slip for the following reasons: a) the uneven distribution of NH 3 can lead to over rich NH 3 locally, which causes NH 3 slip, while the area with lean NH 3 will cause lower NO X conversion efficiency; b) the uneven distribution of urea droplets can cause overly low temperature and rich urea locally, which leads to urea crystallization on the metal surface, and more seriously, can even cause exhaust pipe blockage, resulting in performance degradation of the engine; c) the long‐term mal‐distribution of NH 3 can also cause no uniform aging degree of the catalyst and affect the service life of the catalyst and the performance of the SCR system …”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Liu

2017

Can J Chem Eng

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In a urea selective catalytic reduction (urea‐SCR) system for diesel engines, the atomization, evaporation, and mixing conditions of urea water solution (UWS) play a crucial role for NOX conversion and ammonia slip in the SCR process. In this paper, a series of novel mixing modules were proposed to improve UWS evaporation, mixing, and distribution for NOX reduction in the SCR system. Experimental investigations were conducted on the performances of the existing and developed mixing modules under various engine test conditions, including particle size test, NOX conversion efficiency, flow bench tests, etc. To determine ammonia slip, the urea and ammonia distribution patterns were constructed and the non‐uniformity index was then calculated. Compared with the baseline (without mixing module) and existing mixing module, the NOX conversion efficiency of the SCR system with a developed mixing module is improved by 37.7 and 14.1 % at maximum, respectively. Furthermore, ammonia slip and distribution are ameliorated significantly with low‐pressure drops simultaneously. Among the mixing modules, Concept 3 design exhibits superior performance under the engine test conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Liu

2017

Can J Chem Eng

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“…In literature, several investigations have been dedicated to understanding and modeling the spray and drop impact [4][5][6][7]. Phenomena such as film formation and single droplet wall interaction have already been studied to better get an understanding of the hydrodynamics of the droplets [8][9][10][11][12][13][14]. Formation of solid deposits has also been studied in [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mixer Plate Temperature and Wall Impingement Regimes in Selective Catalytic Reduction Systems

Daniyal¹,

Khan²,

Bjernemose³

et al. 2022

Preprint

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“…Previous studies analyzed individual phenomena such as the urea film formation as a result of the spray-wall interaction and single-droplet-wall interaction [4,5,[15][16][17][18][19][20][21][22][23][24][25][26][27][28] to better understand the hydrodynamic processes occurring in the SCR systems. Other studies examine the consequences of wall films in SCR systems, in particular the formation of solid deposits [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of AdBlue Film Formation in a Generic SCR Test Bench and Numerical Analysis Using LES

et al. 2021

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In this work, an experimental investigation of AdBlue film formation in a generic selective catalytic reduction (SCR) exhaust gas test bench is presented. AdBlue is injected into a generic SCR test bench resulting in liquid film formation on the lower wall of the channel. The thickness of this liquid film is measured using a film thickness sensor based on absorption spectroscopy. Simultaneously, the wall temperature at the measurement point is monitored, which allows for examining correlations between the evolution of the film thickness and the temperature of the wetted wall. The velocity of the airflow in the channel and the initial wall temperature are varied in the experiments. Correspondingly, the measurements are performed during different thermodynamic regimes, including liquid film deposition and boiling. Repeated measurements have also shown that the film thicknesses are reproducible with a standard deviation of 3.4 %. LES-based numerical simulations are compared to the experimental results of the film thickness during the early injection stage. Finally, a numerical analysis is performed to analyze the AdBlue droplet impingement and subsequent film-formation dynamics.

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A Study of a New Aftertreatment System (2): Control of Urea Solution Spray for Urea-SCR

Cited by 30 publications

References 3 publications

Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Experimental investigation on the urea injection and mixing module for improving the performance of urea‐SCR in diesel engines

Experimental Investigation of Mixer Plate Temperature and Wall Impingement Regimes in Selective Catalytic Reduction Systems

Experimental Investigation of AdBlue Film Formation in a Generic SCR Test Bench and Numerical Analysis Using LES

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