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Tailor-Made Fuels from Biomass: Influence of Molecular Structures on the Exhaust Gas Emissions of Compression Ignition Engines
Technical Paper
2013-36-0571
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to deeply investigate and improve the complete path from biofuel production to combustion, the cluster of excellence “Tailor-Made Fuels from Biomass” was installed at RWTH Aachen University in 2007. Recently, new pathways have been discovered to synthesize octanol [1] and di-n-butylether (DNBE). These molecules are identical in the number of included hydrogen, oxygen and carbon atoms, but differ in the molecular structure: for octanol, the oxygen atom is at the end of the molecule, whereas for DNBE it is located in the middle.
In this paper the utilization of octanol and DNBE in a state-of-the-art single cylinder diesel research engine will be discussed. The major interest has been on engine emissions (NOx, PM, HC, CO, noise) compared to conventional diesel fuel. Soot emissions can almost be avoided completely with octanol, but due to its longer ignition delay (cetane number (CN) ∼ 40), an increase of HC- and CO-emissions about 20% is observed at part load compared to diesel fuel. Even though DNBE has a CN ∼ 100, the combustion can be considered to be almost soot free even at Euro 6 NOx-levels at high part load. In contrast to octanol, due to the fast ignition of DNBE, over-leaning at low load operation can be prevented.
To gain a better understanding of this phenomenon, both fuels have been characterized at engine relevant boundary conditions inside the continuously scavenged high-pressure chamber test bench at RWTH Aachen University. The results show that DNBE provides a significantly decreased ignition delay and lift-off in comparison to octanol.
To provide deeper insight into the spray and mixture formation processes, numerical simulations of the spray vessel experiments are undertaken. The physical properties of DNBE and octanol are integrated into the data base of an in-house CFD code. Spray simulations show good agreement to experimental data concerning liquid and gaseous penetration length and spray cone angle. The numerical results allow for closer analysis of the fuel mixture fraction at the experimentally observed ignition location and thus help to explain the differences in the ignition and the similar sooting behavior.
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Authors
- B. Heuser - Institute for Combustion Engines, RWTH Aachen University
- M. Jakob - Institute for Combustion Engines, RWTH Aachen University
- F. Kremer - Institute for Combustion Engines, RWTH Aachen University
- Stefan Pischinger - Institute for Combustion Engines, RWTH Aachen University
- B. Kerschgens - Institute for Combustion Technology, RWTH Aachen University
- H. Pitsch - Institute for Combustion Technology, RWTH Aachen University
Topic
Citation
Heuser, B., Jakob, M., Kremer, F., Pischinger, S. et al., "Tailor-Made Fuels from Biomass: Influence of Molecular Structures on the Exhaust Gas Emissions of Compression Ignition Engines," SAE Technical Paper 2013-36-0571, 2013, https://doi.org/10.4271/2013-36-0571.Also In
References
- Julis , J. , Leitner , W. Selective conversion of biomass-derived platform chemicals to 1-octanol and 1,1-dioctylether Angew. Chem. Int. Ed. 51 8615 8619 2012
- Janssen , A. , Kremer , F. , Baron , M. , Müther M. Pischinger , S. , Klankermayer , J. Tailor-Made Fuels from Biomass for Homogeneous Low-Temperature Diesel Combustion Energy Fuels 25 10 4734 4744 2011
- Janssen , A. , Müther , M. , Pischinger , S. , Kolbeck , A. , Lamping , M. Tailor-Made Fuels: The Potential of Oxygen Content in Fuels for Advanced Diesel Combustion Systems SAE Technical Paper 2009-01-2765 2012
- Pepiot-Desjardins , P. , Pitsch , H. , Malhotra , R , Kirby S.R. , Boehman , A.L. Structural group analysis for soot reduction tendencyof oxygenated fuels Combustion and Flame 154 191 205 2008
- Kremer , F. , Heuser , B. , Pischinger , S. , Klankermayer , J. Optimizing Diesel Combustion Behaviour with Tailor-Made Fuels from Biomass 9th International Colloqium Fuels TAE 16 01 2013
- Bioenergy - Chances and Limits, Statement German National Academy of Science Leopoldina 2012
- Geilen F. M. A. , Engendahl B. , Harwardt A. , Marquardt W. , Klankermayer J. , Leitner W. Selective and flexible transformation of biomass-derived platform chemicals by a multifunctional catalytic system Angew. Chem. Int. Ed. 49 5510 2010
- Muether , M. et al. Advanced Combustion for Low Emissions and High Efficiency, Part 1: Impact of Engine Hardware on HCCI Combustion SAE 2008-01-2405 Warrendale PA Society of Automotive Engineers
- Kremer , F. Untersuchungen zur Verbrennungsratenregelung durch Mehrfacheinspritzung im Dieselmotor Dissertation RWTH Aachen 2013
- Pauls , Ch. , Gruenefeld , G. , Vogel , S. ; Peters , N. Combined simulations and OH chemiluminescence measurements of the combustion process using different fuels under diesel-engine like conditions SAE technical paper 2007-01-0020 2007
- Ferziger , J. H. , Perić , M. Computational Methods for Fluid Dynamics Springer Berlin 2002
- Khalighi , B. , El Tahry , S. , Haworth , D. , Huebler , M. Computation and Measurement of Flow and Combustion in a Four-Valve Engine with Intake Variations SAE Technical Paper 950287 1995 10.4271/950287
- Ewald , J. , Freikamp , F. , Paczko , G. , Weber et al. GMTEC: GMTEC Developer's Manual Technical report Advanced Combustion GmbH 2003
- Spiekermann , P. , Jerzembeck , S. , Felsch , C. , Vogel , S. , Gauding , M. , and Peters , N. Experimental Data and Numerical Simulation of Common-Rail Ethanol Sprays at Diesel Engine-Like Conditions Atomization and Sprays 19 357 386 2009
- Patterson , M. A. , Reitz , R. D. Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emission SAE Technical Paper Series, SAE 980131 1998
- Alt , N. ; Nehl , J. ; Heuer , S. Combustion Sound Prediction within Combustion System Development SIA “Vehicle Comfort” 2004
- Müther M. Einflüsse alternativer Kraftstoffe auf die dieselmotorische Verbrennung PhD Thesis RWTH Aachen 2011
- Espey , C. ; Dec , J. E. The effect of TDC temperature and density on the liquid-phase fuel penetration in a D.I. diesel engine SAE technical paper 952456 1995
- Kitamura , T. ; Itu , T ; Senda , J ; Fujimoto , H Mechanism on smokeless diesel combuston with oxygenated fuels based on the dependence of the equivalence ratio and temperature on soot particle formation Int J Engine research 3 4 2002 223 248
- Siebers , D , Higgins , B. Flame lift-off on direct-injection diesel spray under quiescent conditions SAE Technical Paper 2001-01-0530 2001
- Pickett , L. M. , Siebers , D. L. Non-sooting, low flame temperature mixing-controlled DI diesel combustion SAE technical paper 2004-01-1399 2004
- Su , W. , Yu , W. Effects of mixing and chemical parameters on thermal efficiency in a partly premixed combustion diesel engine with near-zero emission International journal of engine research 13 3 2011 188 198