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Thermal Reduction of NO x in a Double Compression Expansion Engine by Injection of AAS 25 and AUS 32 in the Exhaust Gases
Technical Paper
2019-01-0045
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The double compression expansion engine (DCEE) is a promising concept for high engine efficiency while fulfilling the most stringent European and US emission legislation. The complete thermodynamic cycle of the engine is split among several cylinders. Combustion of fuel occurs in the combustion cylinder and in the expansion cylinder the exhaust gases are over expanded to obtain high efficiency. A high-pressure tank is installed between these two cylinders for after-treatment purposes. One proposal is to utilize thermal reduction of nitrogen oxides (NOx) in the high-pressure tank as exhaust temperatures can be sufficiently high (above 700 °C) for the selective non-catalytic reduction (SNCR) reactions to occur. The exhaust gas residence time at these elevated exhaust temperatures is also long enough for the chemical reactions, as the volume of the high-pressure tank is substantially larger than the volume of the combustion cylinders.
In this paper a single-cylinder D13 engine was run together with a 30 l high-pressure tank, with and without a diesel oxidation catalyst (DOC). AUS 32 and an ammonia-water solution (AAS 25) are injected before the high-pressure tank at different exhaust temperatures to study the thermal reduction of NOx produced from the combustion and the impact of the DOC. Additionally, the normalized stoichiometric ratio (NSR) was swept to evaluate the maximum NOx reduction potential of SNCR. Experimental results showed that very high NOx conversion efficiencies could be achieved for both AUS 32 and AAS 25. NOx conversion efficiencies of 80 % were obtained for NSR = 3. At stoichiometric NOx reductant dosing (NSR = 1), 40 % of nitrogen oxides could be reduced thermally. Presence of a DOC would decrease the efficiency of the thermal reduction as it oxidizes ammonia. At exhaust gas temperatures below 400 °C, platinum in the DOC reduced NOx with a maximum conversion efficiency of 31 % at 350 °C.
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Muric, K., Tunestal, P., Andersson, A., and Andersson, L., "Thermal Reduction of NOx in a Double Compression Expansion Engine by Injection of AAS 25 and AUS 32 in the Exhaust Gases," SAE Technical Paper 2019-01-0045, 2019, https://doi.org/10.4271/2019-01-0045.Data Sets - Support Documents
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References
- Cummins , C.L. Diesel’s Engine: From Conception to 1918 Carnot Press 1993
- Morgan , R. , Jackson , N. , Atkins , A. , dong , G. et al. The Recuperated Split Cycle-Experimental Combustion Data from a Single Cylinder Test Rig SAE Int. J. Engines 10 5 2596 2605 2017 10.4271/2017-24-0169
- Clarke , J. and O’Malley , E. Analytical Comparison of a Turbocharged Conventional Diesel and a Naturally Aspirated Compact Compression Ignition Engine both Sized for a Highway Truck SAE Technical Paper 2013-01-1736 2013 10.4271/2013-01-1736
- Lam , N. , Tuner , M. , Tunestal , P. , Andersson , A. et al. Double Compression Expansion Engine Concepts: A Path to High Efficiency SAE Int. J. Engines 8 4 1562 1578 2015 10.4271/2015-01-1260
- Bhavani Shankar , V. , Lam , N. , Andersson , A. , and Johansson , B. Optimum Heat Release Rates for a Double Compression Expansion (DCEE) Engine SAE Technical Paper 2017-01-0636 2017 10.4271/2017-01-0636
- Bhavani Shankar , V. , Andersson , A. , and Johansson , B. Double Compression Expansion Engine: A Parametric Study on a High-Efficiency Engine Concept SAE Technical Paper 2018-01-0890 2018 10.4271/2018-01-0890
- Muric , K. , Tunestal , P. , Andersson , A. , Andersson , L. et al. The Potential of SNCR Based NO x Reduction in a Double Compression Expansion Engine SAE Technical Paper 2018-01-1128 2018 10.4271/2018-01-1128
- EPA 1998
- U.S. Environment Protection Agency, Office of Air Quality Planning and Standards 2007
- Burström , P. , Antos , D. , Lundström , T. , and Marjavaara , B. A CFD-Based Evaluation of Selective Non-Catalytic Reduction of Nitric Oxide in Iron Ore Grate-Kiln Plants Progress in Computational Fluid Dynamics An International Journal 15 32 46 2015 10.1504/PCFD.2015.06732
- Muric , K. , Stenlaas , O. , Tunestal , P. , and Johansson , B. An In-Cycle Based NO x Reduction Strategy Using Direct Injection of AdBlue SAE Int. J. Engines 7 4 1984 1996 2014 10.4271/2014-01-2817
- Muric , K. , Tunestal , P. , and Stenlaas , O. A Fast Crank Angle Resolved Zero-Dimensional NOx Model Implemented on a Field-Programmable Gate Array SAE Int. J. Engines 6 1 246 256 2013 10.4271/2013-01-0344
- Willand , J. , Teigeler , M. , Wirbeleit , F. , Enderle , C. et al. Selective Non-Catalytic NOx-Reduction in Diesel Engines Using Aqueous Urea SAE Technical Paper 982651 1998 10.4271/982651
- https://www.energy.gov/sites/prod/files/2014/03/f8/deer10_folic.pdf
- Griggs , D. and Noguer , M. Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change Weather 57 8 267 269 2002
- Madia , G. , Koebel , M. , Elsener , M. , and Wokaun , A. Side Reactions in the Selective Catalytic Reduction of NOx with Various NO2 Fractions Industrial & Engineering Chemistry Research 41 16 4008 4015 2002
- Taylor , G.B. Oxidation of Ammonia Industrial and Engineering Chemistry 19 11 1927
- Thomas , J.M. and John , W. Principles and Practice of Heterogeneous Catalysis John Wiley & Sons 2015