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Emisssions from Hydrogen Enriched CNG Production Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 21, 2002 by SAE International in United States
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In the immediate future the introduction of a wider variety of fuel types will play a significant role in reducing emissions and in solving the energy needs of the transportation industry. Both compressed natural gas, CNG, and hydrogen are expected to play very large roles, and the present paper shows that these fuels, when used together, can offer large benefits in NOx emissions. Significant reductions in NOx emissions will be required for CNG transit buses and heavy duty trucks, if they are to meet the future stringent emissions standards that come into effect in the year 2007. In the present paper a detailed engine model was used to understand and predict the results from engine dynamometer tests from a production automotive engine over a range of hydrogen/CNG gas fuel mixtures. The engine model has the capability to duplicate the testing conditions, such as power, rpm, compression ratio, and inlet conditions, and the model used a finite rate chemical reaction mechanism to predict the NOx emissions. For all the experimental cases considered there is excellent agreement between the experimental data and the predictions of the engine model. Therefore, it appears that the NOx reduction can be well described by the low temperatures caused by low equivalence ratios that are possible with hydrogen enriched CNG.
- A. Ochoa - Department of Mechanical & Aerospace Engineering, University of California, Davis
- Harry A. Dwyer - Department of Mechanical & Aerospace Engineering, University of California, Davis
- J. Wallace - Department of Mechanical & Aerospace Engineering, University of California, Davis
- C. J. Brodrick - Institute of Transportation Studies, UC Davis
CitationOchoa, A., Dwyer, H., Wallace, J., and Brodrick, C., "Emisssions from Hydrogen Enriched CNG Production Engines," SAE Technical Paper 2002-01-2687, 2002, https://doi.org/10.4271/2002-01-2687.
- Bruch K., “The Caterpillar 3406 Spark Ignited Low Emission Natural Gas Engine”, ASME 91-ICE-5.
- Beck N.J., Johnson W.P., Peterson P.W., “Optimized EFI for Natural Gas Fueled Engines”, SAE 911650.
- Hundleby G., Thomas J.R., “Low Emission Engines for Heavy-Duty natural Gas Powered Urban Vechicles, Development Experiences”, SAE 902068.
- Dimplefeld P., Mack J., “Design and Testing of a Natural Gas Fueled Rotary Engine”, SAE 920307.
- Collier K., Hoekstra R.L., Jones C., Hahn D., “Untreated Exhaust Emissions of a Hydrogen Enriched CNG Production Engine Conversion”, SAE 960858.
- Dwyer H. A., “CHEM_WORK6 - A Personal PC Program for Ideal Gas Equilibrium Calculations with IC Engine Applications”, UC Davis, 2002.
- Heywood, J.B., “Internal Combustion Engine Fundamentals”, McGraw-Hill Book Company, New York, 1988.
- Reynolds, W.C., STANJAN: Version 3.8C, May 1988, Stanford Univ.
- Kee, R.J., Rupley, F.M., and Miller, J.A. (1990). CHEMKIN II, Sandia National Laboratory Report SAND 89-8009, 1989.
- MATLAB, Version 6.1, Mathworks Corporation, 2001.