Quantification of the Formaldehyde Emissions from Different HCCI Engines Running on a Range of Fuels 2005-01-3724
In this paper, the formaldehyde emissions from three different types of homogenous charge compression ignition (HCCI) engines are quantified for a range of fuels by means of Fourier Transform Infra Red (FTIR) spectroscopic analysis. The engines types are differentiated in the way the charge is prepared. The characterized engines are; the conventional port fuel injected one, a type that traps residuals by means of a Negative Valve Overlap (NVO) and finally a Direct Injected (DI) one. Fuels ranging from pure n-heptane to iso-octane via diesel, gasoline, PRF80, methanol and ethanol were characterized.
Generally, the amount of formaldehyde found in the exhaust was decreasing with decreasing air/fuel ratio, advanced timing and increasing cycle temperature. It was found that increasing the source of formaldehyde i.e. the ratio of heat released in the cool-flame, brought on higher exhaust contents of formaldehyde. The application of a standard three-way catalyst completely removed formaldehyde from the exhaust stream.
Citation: Lemel, M., Hultqvist, A., Vressner, A., Nordgren, H. et al., "Quantification of the Formaldehyde Emissions from Different HCCI Engines Running on a Range of Fuels," SAE Technical Paper 2005-01-3724, 2005, https://doi.org/10.4271/2005-01-3724. Download Citation
Mikael Lemel, Anders Hultqvist, Andreas Vressner, Henrik Nordgren, Håkan Persson, Bengt Johansson
Div. of Combustion Engines, Department of Heat and Power Engineering Lund Institute of Technology
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SAE 2005 Transactions Journal of Fuels and Lubricants-V114-4