A NOx Reduction Solution for Retrofit Applications: A Simple Urea SCR Technology

Servati, H.; Petreanu, S.; Marshall, Stephen; Hong, Su Young; Marshall, R. A.; Attarsyedi, S.; Wu, Cheng‐Hsien; Hughes, Kelsie L.; Simons, L.; Berrimann, L.; Zabsky, J.; Gomulka, T.; Rinaldi, Fabrizio C.; Tynan, Mark; Salem, J.; Joyner, J.

doi:10.4271/2005-01-1857

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…A limitation to this approach is that the aftertreatment efficiency will always depend upon the thermodynamic conditions of the engine exhaust. During the severly low load conditions of the JE05 Japanese test cycle or the first 600 sec of the US FTP where the percentage of idle time is considerably high, or during any engine operation involving low loads for extended periods, the controller must interrupt the urea supply to prevent catalyst fouling by incomplete decomposition of HNCO, cynuric acid, ammonium nitrate and compounds of NH 3 , whose concentration increases especially at temperatures are relatively low [6,7].…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Simple strategy-based technique to reduce emissions from SCR-equipped heavy-duty diesel engine over different engine-out calibrations

Ardanese¹

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Heavy-duty diesel engine manufacturers, regulators and operators in Europe and US have judged the Selective Catalytic Reduction (SCR) system to be the most suitable exhaust aftertreatment technology to meet the Euro V and US 2010 emission standards for oxides of nitrogen (NOx). The choice of the SCR as the exhaust aftertreatment system has been accompanied by engine calibrations with higher engine-out NOx emissions. Temporary deactivation of the exhaust aftertreatment device, due to malfunction or disrepair could result in excessively high NOx emissions at the tailpipe. Therefore, there is a need to evaluate alternative engine calibrations that would limit in-use NOx emissions during SCR inefficiencies. The objective of this study was to develop and implement a technique to program an engine with different calibrations, which were optimized for exhaust aftertreatment performance. Two very distinct calibrations were evaluated over transient and steady state conditions. The implementation of these calibrations helped meet the emission standards under conditions, which are critical for the SCR operation under real worldconditions, but may not be encountered during the engine certification testing. Multiple calibrations were designed by means of a simple multivariate optimization technique involving the variation of only four engine parameters, namely EGR rate, boost pressure, injection pressure and injection timing. In addition, an empirical model for accurate NOx and fuel consumption (FC) prediction was developed, assuming independency of the parameters. The technique developed in this study was found to be quick to implement, simple and efficient; requiring very little engine test cell time. The main calibrations proved to be engine cycle independent, since comparable emission levels were measured over ESC, FTP and ETC cycles. Low-NOx map was obtained by raising the injection pressure and increasing EGR rates. A NOx emissions reduction of 20% was achieved, with a penalty in fuel economy of less than 3% from the baseline. Several fuel efficient calibrations were generated by advancing injection timing and increasing injection pressure; the highest improvement brought a reduction in FC of more than 6%. Multiple calibrations can be generated by this technique and alternatively used by the engine control system depending upon the thermodynamic conditions of the exhaust stream at the inlet of the SCR system

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Section: Chapter 1 Introductionmentioning

confidence: 99%

Simple strategy-based technique to reduce emissions from SCR-equipped heavy-duty diesel engine over different engine-out calibrations

Ardanese¹

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Particulate Matter and NOx Reduction Techniques for Internal Combustion Engine: A Review

Bindra

Vashist

2020

J. Inst. Eng. India Ser. C

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Closed-loop control strategy of NH<inf>3</inf>-SCR for diesel engines

Tan

Chen

et al. 2011

2011 International Conference on Electric Information and Control Engineering

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SCR technology is one of effective methods to reduce NOx emissions from diesel engines. In this paper, a SCR system model is established based on AMESim software and a mathematical model of SCR control system is established in the Matlab/Simulink environment, and a complete system is formed by setting communication modules between the two softwares. The SCR closed-loop control strategy is studied, and the PI control strategy is introduced to build a closed-loop SCR control system model and the simulation is performed. AdBlue dosing, NOx conversion ratio and NH 3 leakage at the different exhaust temperature are studied with different control parameters.

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A NOx Reduction Solution for Retrofit Applications: A Simple Urea SCR Technology

Cited by 5 publications

References 6 publications

Simple strategy-based technique to reduce emissions from SCR-equipped heavy-duty diesel engine over different engine-out calibrations

Simple strategy-based technique to reduce emissions from SCR-equipped heavy-duty diesel engine over different engine-out calibrations

Particulate Matter and NOx Reduction Techniques for Internal Combustion Engine: A Review

Closed-loop control strategy of NH<inf>3</inf>-SCR for diesel engines

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