Experimental Characterization of SCR DeNOx-Systems: Visualization of Urea-Water-Solution and Exhaust Gas Mixture

Lecompte, Matthieu; Raux, S.; Frobert, Arnaud

doi:10.4271/2014-01-1524

Cited by 11 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, gas temperature slightly affects the spray development. LeCompte et al [11] evaluated the effect of exhaust pipe geometry, mixer location and gas temperature on the vaporization and homogenization of the mixture using optical diagnostics as well.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

Payri

Bracho

Gimeno

et al. 2019

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

Payri

Bracho

Gimeno

et al. 2019

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

“…J. Oh et al have used a laser sheet imaging with a high-speed camera for the characterization of spray and determination of optimal injector/ mixer distance for UWS injection [11,12]. Spray properties and mixing characterization under various gas flow conditions has been done using Laser-Induced Fluorescence (LIF) and shadowgraphy by M. Lecompte et al [13]. Experimental investigation on atomization of spray in various crossflow conditions by Mie scattering, particle image velocimetry, and shadowgraphy has been carried out by A. Spiteri et al [14].…”

Section: Eq (3)mentioning

confidence: 99%

“…, , 0 0 Eq. (13) This mass exchange appears as a source of mass in the gas continuity equation [34]. After reaching the vaporization temperature, the following mass transfer equation is also applied:…”

Section: Reprinted With Permission Frommentioning

confidence: 99%

Experimental Characterization and Numerical Modelling of Urea Water Solution Spray in High-Temperature Crossflow for Selective Catalytic Reduction Applications

Khan¹,

Bjernemose²,

Lund³

2022

SAE J. STEEP

View full text Add to dashboard Cite

Engines have improved a lot and reached a new state of the art in terms of combustion technology, but they alone still fall short in achieving emission limitations without any trade-off on performance. Selective Catalytic Reduction (SCR) is the key technology used to meet the increasingly strict Nitrogen Oxides (NOx) emission regulations. The injection of Urea Water Solution (UWS-32.5% urea solution) upstream the catalyst is currently the leading technique for reducing the emission of NOx from the exhaust (DeNOx). A uniform distribution of the spray droplets is very crucial to achieve a good conversion efficiency. Therefore, the size and velocity distribution of the droplets are of high importance in deciding the fate of the DeNOx process. This article describes an approach of modelling the UWS spray and its validation against experimental data collected under realistic exhaust-like conditions. Droplet size distributions and velocities were recorded using Phase Doppler Anemometry (PDA) in a high-temperature wind tunnel. Simulations of the spray were performed using a commercial Computational Fluid Dynamics (CFD) code, ANSYS Fluent, in Lagrangian solver framework under the same flow conditions.The results show that initializing the droplets with the correct diameter and velocity distributions is a vital element in determining the fate of droplets and their impingement location. Using the proposed methodology, validation of diameter and velocity distributions were performed and the average deviations in Sauter Mean Diameter (SMD) were found to be less than 8%. Deviations in velocity distributions were recorded with larger differences appearing in planes closer to the nozzle. It was seen that the simulation initiated with the correct momentum had an average difference of around 8% whereas the simulation initiated with a single velocity value had an average difference of around 32%, when compared with the actual measurement data.

show abstract

“…Zhang, Scott Sluder and Tang et al undertook urea decomposition under low temperature, as well as the effects on SCR performance [5][6][7]. Lecompte and Ning et al used dosing control strategy to manage urea injection to achieve high NOx reduction efficiency [8][9]. Okada et al selected a urea reforming method including a heat resource, so as to consider further improvement of NOx reduction at a low temperature [10].…”

Section: Introductionmentioning

confidence: 99%

A CAN-Based Urea Line Heater Diagnostics Development and Experimental Validation for Selective Catalytic Reduction (SCR) System

2021

View full text Add to dashboard Cite

Urea line heating system is critical for Selective Catalytic Reduction (SCR) aftertreatment system under low temperature environment. Traditionally, the Electronic Control Unit (ECU) motivates urea lines heating command and diagnostics directly. This paper illustrates a Controller Area Network (CAN)-based line heater architecture development for the SCR aftertreatment system, as well as the diagnostics generation. The CAN-based line heater diagnostics is validated on vehicle experimental with four different given cases. It can be seen from the validation results that the diagnostics logic and algorithm are reasonable, and the line heater failure modes could be detected correctly including open circuit, short circuit and inducement. In addition, the failure modes are able to set or clear for each of the urea lines according to the diagnostics logic. ECU and ECU1 could communicate well between each other by CAN. This study introduces a new line heater architecture for SCR aftertreatment system which is meaningful for the whole vehicle assembly, which could be considered in the real application in future.

show abstract

Experimental Characterization of SCR DeNOx-Systems: Visualization of Urea-Water-Solution and Exhaust Gas Mixture

Cited by 11 publications

References 11 publications

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

Experimental Characterization and Numerical Modelling of Urea Water Solution Spray in High-Temperature Crossflow for Selective Catalytic Reduction Applications

A CAN-Based Urea Line Heater Diagnostics Development and Experimental Validation for Selective Catalytic Reduction (SCR) System

Contact Info

Product

Resources

About