NDLI: Equilibrium Chemistry Calculations for Assessment of NOx Abatement Strategies in IC Engines

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Equilibrium Chemistry Calculations for Assessment of NOx Abatement Strategies in IC Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Aithal, S. M.
Copyright Year	2011
Abstract	Nitrogen Enriched Air (NEA) has shown great potential in NOx reduction without the drawbacks of exhaust gas recirculation (EGR). Use of NEA in stationary natural gas engines has shown up to 70% NOx reduction with a modest 2% nitrogen enrichment. However, nitrogen enrichment beyond a point leads to degradation in engine performance in terms of power density, brake thermal efficiency and unburned hydrocarbons. Optimizing the nitrogen enrichment levels to reduce NOx without performance degradation of the engine would greatly benefit the advancement of the air separation membrane technology. Development of fast and robust modeling tools to compute the temporal variation of the incylinder engine pressure, temperature and NOx formation can aid experimental efforts in determining the optimum enrichment levels for a given engine operating condition. This work presents a methodology to compute engine-out NOx for engines with and without nitrogen enrichment. Temporal variation of in-cylinder engine pressure and temperature can be obtained by a solution of the energy equation. Using these temperature and pressure values, along with the instantaneous composition of the working fluid, one can evaluate the equilibrium concentration of the combustion products. Since the NOx formation freezes a few crank angle degrees after the completion of combustion, it is instructive to examine whether the equilibrium computation can provide a reasonable estimate of engine-out NOx. To this end, engine-out NOx computed by using the above-mentioned procedure was obtained as a function of equivalence ratio for cases with nitrogen enrichment of 2% and no nitrogen enrichment. The results showed that the equilibrium NOx concentrations a few crank angle degrees after end of combustion were close to those reported experimentally in stationary natural gas engines. These results suggest that it would be possible to use equilibrium chemistry computations to evaluate various NOx mitigation strategies.
Sponsorship	Internal Combustion Engine Division
Starting Page	847
Ending Page	856
Page Count	10
File Format	PDF
ISBN	9780791844427
DOI	10.1115/ICEF2011-60030
Conference Proceedings	ASME 2011 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2011-10-02
Publisher Place	Morgantown, West Virginia, USA
Access Restriction	Subscribed
Subject Keyword	Power density Temperature Membranes Equilibrium (physics) Gas engines Combustion Nitrogen Separation (technology) Pressure Modeling Engines Chemistry Fluids Exhaust gas recirculation Computation Internal combustion engines Nitrogen oxides Thermal efficiency Brakes Cylinders
Content Type	Text
Resource Type	Article

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