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Nitrogen Oxide Production in a Diesel Engine Fueled by Natural Gas
Technical Paper
2005-01-1727
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The effect of large exhaust gas re-circulation (EGR) quantities on NOx production in a natural-gas-fueled direct-injection heavy-duty diesel engine has been tested over a range of speed, load, and timing in controlled experiments with a single-cylinder engine. At the highest EGR ratio, as much as 50% of the cylinder- out NOx was NO2. NOx results correlated well with oxygen mole fraction in the unburned gas because of the direct dependence of flame temperature on this quantity. Within the range of measurements, speed and load had little or no effect on the relationship between oxygen mole fraction and NOx production.
A multi-zone model for estimating combustion rate, flame temperature, wall heat transfer, and NOx production from engine operating conditions and the record of cylinder pressure development with crank angle, was used to interpret experimental measurements. The model showed the incompatibility of test data with the normal form of the extended Zeldovich model on NO production. However a modified form of it served to correlate experimental data with oxygen mole fraction - which was a nearly linear function of flame temperature. The model also served to represent the effects of engine timing (defined here as the crank angle corresponding to 50% cumulative indicated heat release) on NOx production. At highest EGR (lowest oxygen mole fraction) the NOx emissions were of the order of 1 g/kg of fuel. At this condition CO and unburned hydrocarbon emissions were high, indicating the need for enhanced burning rate.
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Hill, P. and McTaggart-Cowan, G., "Nitrogen Oxide Production in a Diesel Engine Fueled by Natural Gas," SAE Technical Paper 2005-01-1727, 2005, https://doi.org/10.4271/2005-01-1727.Also In
CI Engine Performance for Use With Alternative Fuels, and New Diesel Engines and Components
Number: SP-1978; Published: 2005-04-11
Number: SP-1978; Published: 2005-04-11
References
- Ahmed, T. Plee, S. L. 1983 “Application of Flame Temperature Correlations to Emissions from a Direct- Injection Diesel engine” SAE Technical Paper 831734
- Bedat, B. Egolfopoulos, F. N. Poinsot, T. 1999 “Direct Numerical Simulation of Heat Release and NOx Formation in Turbulent Nonpremixed Flames” Combustion and Flame 119 69 83
- Bowman, C.T. 1975 “Kinetics of pollutant Formation and Destruction in Combustion” Prog. Energy Combust. Sci 1975 1 31 45
- Bowman, C. T. Seery, D. J. 1972 Emissions from Continuous Combustion Systems Cornelius W. Agnew W. G. 123
- Caldeira-Pires, A. Heitor, M. V. Carvalho, J. A. 2000 “Characteristics of Nitric Oxide Formation rates in Turbulent Nonpremixed Jet Flames” Combustion and Flame 120 383 391
- Chen, R-H. 1998 “A Parametric Study of NO2 Emission from Turbulent H2 and CH4 Jet Diffusion Flames” Combustion and Flame 112 188 198
- Heywood, J. B 1988 “Internal Combustion Engine Fundamentals” McGraw Hill New York
- Hill. P. G. Douville, B. 1997 “Relating Burning Rate and NO Formation to Pressure Development in Two-Stroke Engines” ASME J. Energy Res. Tech. 119 129 136
- Li, S. C. Williams, F. A. 1999 “NOx Formation in Two-Stage Methane-Air Flames” Combustion and Flame 118 399 414
- Li, S. C. Williams, F. A. Gebert, K. 1999 “A Simplified Fundamentally Based Method for Calculating NOx Emissions in Lean Premixed Combustors” Combustion and Flame 119 367 373
- McTaggart-Cowan, G. Bushe, W. K. Hill, P.G. 2004 “NOx Reduction from a Heavy-duty Diesel Engine with Direct Injection of Natural Gas and Cooled Exhaust Gas Re-circulation” International Journal of Engine Research 5 2 175 191
- McTaggart-Cowan, G. Bushe, W. K. Hill, P.G. Munshi, S. 2003 “A Supercharged Single-Cylinder Heavy Duy Engine for High Pressure Direct Injection of Natural Gas” International Journal of Engine Research 4 4 315 330
- Sarofim, A.F. Pohl, J. H. 1973 Fourteenth Symposium (International) on Combustion 739 The Combustion Institute
- Sohn, C. H. Chung, S. H. 2000 “Effect of Pressure on the Extinction, Accoustic Pressure Response, and NO Formation in diluted Hydrogen-Air Diffusion Flames” Combustion and Flame 121 288 300
- Sohn, C.H. Jeong, I. M. Chung, S. H. 2002 “Numerical study of the Effects of Pressure and Air- Dilution on NO Formation in Laminar Counter-flow Diffusion flames of Methane in High Temperature Air” Combustion and Flame 130 83 93
- Thomsen, D. Kuligowski, F.F. Laurendau, N. M. 1999 “Modeling of NO Formation in Premixed High- Pressure Methane Flames” Combustion and Flame 307 318
- Tomeczek, J Gradon, B. 2003 “The Role of N2O and NNH in the Formation of NO via HCN in Hydrocarbon Flames” Combustion and Flame 133 311 322
- Reynolds, W.C. 1987 “STANJAN Equilibrium Solver” Mech. Eng. Dept, Stanford University Palo Alto, CA.
- Thompson, D. Brown, T. D. Beer, J. M. 1972 Combust. Flame 19 69