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Ammonia measurement issues using quantum cascade laser and two different Fourier transform infrared spectroscopy methods

journal contribution
posted on 13.07.2020 by Nilton Li, Ashraf El-Hamalawi, Richard Barrett, Jim Baxter
© 2020 SAE International. All Rights Reserved. Most diesel engine exhausts have been fitted with SCR (Selective Catalyst Reduction) in order to reduce NOX (Oxides of Nitrogen) by using NH3 (ammonia). However, both NOX and NH3 have been classified as compounds hazardous for the environment and human health. If the reaction between NOX and NH3 is unbalanced during treatment, it can lead to either NOX or NH3 being released into the environment. Accurate measurement is thus necessary. QCL (Quantum Cascade Laser) and FTIR (Fourier Transform InfraRed) are two methods that have been used to measure NH3 and NOX directly in diesel engine exhausts. However, only a few studies have compared those two methods of NH3 measurement, mainly from diesel engine exhausts. The aim of this paper is to compare the QCL and 2 different FTIR specifications for NH3 measurement directly from diesel engine exhausts under well-controlled laboratory conditions. Researchers have found that as NH3 is reactive, it is absorbed inside the exhaust pipe if the probe location is some distance away from the SCR. The results reported here contradict this and show that the probe location has only a small impact on NH3 measurement inside the exhaust pipe. Furthermore, both instruments gave comparable results with the necessary regulatory precision. The outcome from this paper will have an impact on the discipline of NH3 measurement and industry in the way NH3 from diesel engines is measured.

History

School

  • Architecture, Building and Civil Engineering

Published in

SAE International Journal of Engines Research

Pages

2020-01-0365

Publisher

SAE International

Version

AM (Accepted Manuscript)

Rights holder

© SAE International

Publisher statement

This paper was accepted for publication in the journal SAE Technical Paper and the definitive published version is available at https://doi.org/10.4271/2020-01-0365

Acceptance date

23/01/2020

Publication date

2020-04-14

eISSN

0148-7191

Depositor

Dr Ashraf El-Hamalawi Deposit date: 8 July 2020

Article number

2020-01-0365

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